Fri, 04 Mar 2011 14:40:46 -0500
6845426: non-static <clinit> method with no args is called during the class initialization process
Summary: Only call <clinit> with ACC_STATIC for classfiles with version > 50
Reviewed-by: acorn, dholmes, coleenp
1 /*
2 * Copyright (c) 1997, 2010, 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/javaClasses.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/verificationType.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPoolOop.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/klassOop.hpp"
42 #include "oops/klassVtable.hpp"
43 #include "oops/methodOop.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/perfData.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/timer.hpp"
51 #include "services/classLoadingService.hpp"
52 #include "services/threadService.hpp"
54 // We generally try to create the oops directly when parsing, rather than
55 // allocating temporary data structures and copying the bytes twice. A
56 // temporary area is only needed when parsing utf8 entries in the constant
57 // pool and when parsing line number tables.
59 // We add assert in debug mode when class format is not checked.
61 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
62 #define JAVA_MIN_SUPPORTED_VERSION 45
63 #define JAVA_MAX_SUPPORTED_VERSION 51
64 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
66 // Used for two backward compatibility reasons:
67 // - to check for new additions to the class file format in JDK1.5
68 // - to check for bug fixes in the format checker in JDK1.5
69 #define JAVA_1_5_VERSION 49
71 // Used for backward compatibility reasons:
72 // - to check for javac bug fixes that happened after 1.5
73 // - also used as the max version when running in jdk6
74 #define JAVA_6_VERSION 50
76 // Used for backward compatibility reasons:
77 // - to check NameAndType_info signatures more aggressively
78 #define JAVA_7_VERSION 51
81 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
82 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
83 // this function (_current can be allocated in a register, with scalar
84 // replacement of aggregates). The _current pointer is copied back to
85 // stream() when this function returns. DON'T call another method within
86 // this method that uses stream().
87 ClassFileStream* cfs0 = stream();
88 ClassFileStream cfs1 = *cfs0;
89 ClassFileStream* cfs = &cfs1;
90 #ifdef ASSERT
91 assert(cfs->allocated_on_stack(),"should be local");
92 u1* old_current = cfs0->current();
93 #endif
95 // Used for batching symbol allocations.
96 const char* names[SymbolTable::symbol_alloc_batch_size];
97 int lengths[SymbolTable::symbol_alloc_batch_size];
98 int indices[SymbolTable::symbol_alloc_batch_size];
99 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
100 int names_count = 0;
102 // parsing Index 0 is unused
103 for (int index = 1; index < length; index++) {
104 // Each of the following case guarantees one more byte in the stream
105 // for the following tag or the access_flags following constant pool,
106 // so we don't need bounds-check for reading tag.
107 u1 tag = cfs->get_u1_fast();
108 switch (tag) {
109 case JVM_CONSTANT_Class :
110 {
111 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
112 u2 name_index = cfs->get_u2_fast();
113 cp->klass_index_at_put(index, name_index);
114 }
115 break;
116 case JVM_CONSTANT_Fieldref :
117 {
118 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
119 u2 class_index = cfs->get_u2_fast();
120 u2 name_and_type_index = cfs->get_u2_fast();
121 cp->field_at_put(index, class_index, name_and_type_index);
122 }
123 break;
124 case JVM_CONSTANT_Methodref :
125 {
126 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
127 u2 class_index = cfs->get_u2_fast();
128 u2 name_and_type_index = cfs->get_u2_fast();
129 cp->method_at_put(index, class_index, name_and_type_index);
130 }
131 break;
132 case JVM_CONSTANT_InterfaceMethodref :
133 {
134 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
135 u2 class_index = cfs->get_u2_fast();
136 u2 name_and_type_index = cfs->get_u2_fast();
137 cp->interface_method_at_put(index, class_index, name_and_type_index);
138 }
139 break;
140 case JVM_CONSTANT_String :
141 {
142 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
143 u2 string_index = cfs->get_u2_fast();
144 cp->string_index_at_put(index, string_index);
145 }
146 break;
147 case JVM_CONSTANT_MethodHandle :
148 case JVM_CONSTANT_MethodType :
149 if (!EnableMethodHandles ||
150 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
151 classfile_parse_error(
152 (!EnableMethodHandles ?
153 "This JVM does not support constant tag %u in class file %s" :
154 "Class file version does not support constant tag %u in class file %s"),
155 tag, CHECK);
156 }
157 if (tag == JVM_CONSTANT_MethodHandle) {
158 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
159 u1 ref_kind = cfs->get_u1_fast();
160 u2 method_index = cfs->get_u2_fast();
161 cp->method_handle_index_at_put(index, ref_kind, method_index);
162 } else if (tag == JVM_CONSTANT_MethodType) {
163 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
164 u2 signature_index = cfs->get_u2_fast();
165 cp->method_type_index_at_put(index, signature_index);
166 } else {
167 ShouldNotReachHere();
168 }
169 break;
170 case JVM_CONSTANT_InvokeDynamicTrans : // this tag appears only in old classfiles
171 case JVM_CONSTANT_InvokeDynamic :
172 {
173 if (!EnableInvokeDynamic ||
174 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
175 classfile_parse_error(
176 (!EnableInvokeDynamic ?
177 "This JVM does not support constant tag %u in class file %s" :
178 "Class file version does not support constant tag %u in class file %s"),
179 tag, CHECK);
180 }
181 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
182 u2 bootstrap_specifier_index = cfs->get_u2_fast();
183 u2 name_and_type_index = cfs->get_u2_fast();
184 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
185 if (!AllowTransitionalJSR292)
186 classfile_parse_error(
187 "This JVM does not support transitional InvokeDynamic tag %u in class file %s",
188 tag, CHECK);
189 cp->invoke_dynamic_trans_at_put(index, bootstrap_specifier_index, name_and_type_index);
190 break;
191 }
192 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
193 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
194 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
195 }
196 break;
197 case JVM_CONSTANT_Integer :
198 {
199 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
200 u4 bytes = cfs->get_u4_fast();
201 cp->int_at_put(index, (jint) bytes);
202 }
203 break;
204 case JVM_CONSTANT_Float :
205 {
206 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
207 u4 bytes = cfs->get_u4_fast();
208 cp->float_at_put(index, *(jfloat*)&bytes);
209 }
210 break;
211 case JVM_CONSTANT_Long :
212 // A mangled type might cause you to overrun allocated memory
213 guarantee_property(index+1 < length,
214 "Invalid constant pool entry %u in class file %s",
215 index, CHECK);
216 {
217 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
218 u8 bytes = cfs->get_u8_fast();
219 cp->long_at_put(index, bytes);
220 }
221 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
222 break;
223 case JVM_CONSTANT_Double :
224 // A mangled type might cause you to overrun allocated memory
225 guarantee_property(index+1 < length,
226 "Invalid constant pool entry %u in class file %s",
227 index, CHECK);
228 {
229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
230 u8 bytes = cfs->get_u8_fast();
231 cp->double_at_put(index, *(jdouble*)&bytes);
232 }
233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
234 break;
235 case JVM_CONSTANT_NameAndType :
236 {
237 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
238 u2 name_index = cfs->get_u2_fast();
239 u2 signature_index = cfs->get_u2_fast();
240 cp->name_and_type_at_put(index, name_index, signature_index);
241 }
242 break;
243 case JVM_CONSTANT_Utf8 :
244 {
245 cfs->guarantee_more(2, CHECK); // utf8_length
246 u2 utf8_length = cfs->get_u2_fast();
247 u1* utf8_buffer = cfs->get_u1_buffer();
248 assert(utf8_buffer != NULL, "null utf8 buffer");
249 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
250 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
251 cfs->skip_u1_fast(utf8_length);
253 // Before storing the symbol, make sure it's legal
254 if (_need_verify) {
255 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
256 }
258 if (AnonymousClasses && has_cp_patch_at(index)) {
259 Handle patch = clear_cp_patch_at(index);
260 guarantee_property(java_lang_String::is_instance(patch()),
261 "Illegal utf8 patch at %d in class file %s",
262 index, CHECK);
263 char* str = java_lang_String::as_utf8_string(patch());
264 // (could use java_lang_String::as_symbol instead, but might as well batch them)
265 utf8_buffer = (u1*) str;
266 utf8_length = (int) strlen(str);
267 }
269 unsigned int hash;
270 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
271 if (result == NULL) {
272 names[names_count] = (char*)utf8_buffer;
273 lengths[names_count] = utf8_length;
274 indices[names_count] = index;
275 hashValues[names_count++] = hash;
276 if (names_count == SymbolTable::symbol_alloc_batch_size) {
277 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
278 names_count = 0;
279 }
280 } else {
281 cp->symbol_at_put(index, result);
282 }
283 }
284 break;
285 default:
286 classfile_parse_error(
287 "Unknown constant tag %u in class file %s", tag, CHECK);
288 break;
289 }
290 }
292 // Allocate the remaining symbols
293 if (names_count > 0) {
294 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
295 }
297 // Copy _current pointer of local copy back to stream().
298 #ifdef ASSERT
299 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
300 #endif
301 cfs0->set_current(cfs1.current());
302 }
304 // This class unreferences constant pool symbols if an error has occurred
305 // while parsing the class before it is assigned into the class.
306 // If it gets an error after that it is unloaded and the constant pool will
307 // be cleaned up then.
308 class ConstantPoolCleaner : public StackObj {
309 constantPoolHandle _cphandle;
310 bool _in_error;
311 public:
312 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
313 ~ConstantPoolCleaner() {
314 if (_in_error && _cphandle.not_null()) {
315 _cphandle->unreference_symbols();
316 }
317 }
318 void set_in_error(bool clean) { _in_error = clean; }
319 };
321 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
323 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
324 ClassFileStream* cfs = stream();
325 constantPoolHandle nullHandle;
327 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
328 u2 length = cfs->get_u2_fast();
329 guarantee_property(
330 length >= 1, "Illegal constant pool size %u in class file %s",
331 length, CHECK_(nullHandle));
332 constantPoolOop constant_pool =
333 oopFactory::new_constantPool(length,
334 oopDesc::IsSafeConc,
335 CHECK_(nullHandle));
336 constantPoolHandle cp (THREAD, constant_pool);
338 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
339 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
341 // parsing constant pool entries
342 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
344 int index = 1; // declared outside of loops for portability
346 // first verification pass - validate cross references and fixup class and string constants
347 for (index = 1; index < length; index++) { // Index 0 is unused
348 jbyte tag = cp->tag_at(index).value();
349 switch (tag) {
350 case JVM_CONSTANT_Class :
351 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
352 break;
353 case JVM_CONSTANT_Fieldref :
354 // fall through
355 case JVM_CONSTANT_Methodref :
356 // fall through
357 case JVM_CONSTANT_InterfaceMethodref : {
358 if (!_need_verify) break;
359 int klass_ref_index = cp->klass_ref_index_at(index);
360 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
361 check_property(valid_cp_range(klass_ref_index, length) &&
362 is_klass_reference(cp, klass_ref_index),
363 "Invalid constant pool index %u in class file %s",
364 klass_ref_index,
365 CHECK_(nullHandle));
366 check_property(valid_cp_range(name_and_type_ref_index, length) &&
367 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
368 "Invalid constant pool index %u in class file %s",
369 name_and_type_ref_index,
370 CHECK_(nullHandle));
371 break;
372 }
373 case JVM_CONSTANT_String :
374 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
375 break;
376 case JVM_CONSTANT_Integer :
377 break;
378 case JVM_CONSTANT_Float :
379 break;
380 case JVM_CONSTANT_Long :
381 case JVM_CONSTANT_Double :
382 index++;
383 check_property(
384 (index < length && cp->tag_at(index).is_invalid()),
385 "Improper constant pool long/double index %u in class file %s",
386 index, CHECK_(nullHandle));
387 break;
388 case JVM_CONSTANT_NameAndType : {
389 if (!_need_verify) break;
390 int name_ref_index = cp->name_ref_index_at(index);
391 int signature_ref_index = cp->signature_ref_index_at(index);
392 check_property(
393 valid_cp_range(name_ref_index, length) &&
394 cp->tag_at(name_ref_index).is_utf8(),
395 "Invalid constant pool index %u in class file %s",
396 name_ref_index, CHECK_(nullHandle));
397 check_property(
398 valid_cp_range(signature_ref_index, length) &&
399 cp->tag_at(signature_ref_index).is_utf8(),
400 "Invalid constant pool index %u in class file %s",
401 signature_ref_index, CHECK_(nullHandle));
402 break;
403 }
404 case JVM_CONSTANT_Utf8 :
405 break;
406 case JVM_CONSTANT_UnresolvedClass : // fall-through
407 case JVM_CONSTANT_UnresolvedClassInError:
408 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
409 break;
410 case JVM_CONSTANT_ClassIndex :
411 {
412 int class_index = cp->klass_index_at(index);
413 check_property(
414 valid_cp_range(class_index, length) &&
415 cp->tag_at(class_index).is_utf8(),
416 "Invalid constant pool index %u in class file %s",
417 class_index, CHECK_(nullHandle));
418 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
419 }
420 break;
421 case JVM_CONSTANT_UnresolvedString :
422 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
423 break;
424 case JVM_CONSTANT_StringIndex :
425 {
426 int string_index = cp->string_index_at(index);
427 check_property(
428 valid_cp_range(string_index, length) &&
429 cp->tag_at(string_index).is_utf8(),
430 "Invalid constant pool index %u in class file %s",
431 string_index, CHECK_(nullHandle));
432 Symbol* sym = cp->symbol_at(string_index);
433 cp->unresolved_string_at_put(index, sym);
434 }
435 break;
436 case JVM_CONSTANT_MethodHandle :
437 {
438 int ref_index = cp->method_handle_index_at(index);
439 check_property(
440 valid_cp_range(ref_index, length) &&
441 EnableMethodHandles,
442 "Invalid constant pool index %u in class file %s",
443 ref_index, CHECK_(nullHandle));
444 constantTag tag = cp->tag_at(ref_index);
445 int ref_kind = cp->method_handle_ref_kind_at(index);
446 switch (ref_kind) {
447 case JVM_REF_getField:
448 case JVM_REF_getStatic:
449 case JVM_REF_putField:
450 case JVM_REF_putStatic:
451 check_property(
452 tag.is_field(),
453 "Invalid constant pool index %u in class file %s (not a field)",
454 ref_index, CHECK_(nullHandle));
455 break;
456 case JVM_REF_invokeVirtual:
457 case JVM_REF_invokeStatic:
458 case JVM_REF_invokeSpecial:
459 case JVM_REF_newInvokeSpecial:
460 check_property(
461 tag.is_method(),
462 "Invalid constant pool index %u in class file %s (not a method)",
463 ref_index, CHECK_(nullHandle));
464 break;
465 case JVM_REF_invokeInterface:
466 check_property(
467 tag.is_interface_method(),
468 "Invalid constant pool index %u in class file %s (not an interface method)",
469 ref_index, CHECK_(nullHandle));
470 break;
471 default:
472 classfile_parse_error(
473 "Bad method handle kind at constant pool index %u in class file %s",
474 index, CHECK_(nullHandle));
475 }
476 // Keep the ref_index unchanged. It will be indirected at link-time.
477 }
478 break;
479 case JVM_CONSTANT_MethodType :
480 {
481 int ref_index = cp->method_type_index_at(index);
482 check_property(
483 valid_cp_range(ref_index, length) &&
484 cp->tag_at(ref_index).is_utf8() &&
485 EnableMethodHandles,
486 "Invalid constant pool index %u in class file %s",
487 ref_index, CHECK_(nullHandle));
488 }
489 break;
490 case JVM_CONSTANT_InvokeDynamicTrans :
491 case JVM_CONSTANT_InvokeDynamic :
492 {
493 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
494 check_property(valid_cp_range(name_and_type_ref_index, length) &&
495 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
496 "Invalid constant pool index %u in class file %s",
497 name_and_type_ref_index,
498 CHECK_(nullHandle));
499 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
500 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
501 check_property(valid_cp_range(bootstrap_method_ref_index, length) &&
502 cp->tag_at(bootstrap_method_ref_index).is_method_handle(),
503 "Invalid constant pool index %u in class file %s",
504 bootstrap_method_ref_index,
505 CHECK_(nullHandle));
506 }
507 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
508 break;
509 }
510 default:
511 fatal(err_msg("bad constant pool tag value %u",
512 cp->tag_at(index).value()));
513 ShouldNotReachHere();
514 break;
515 } // end of switch
516 } // end of for
518 if (_cp_patches != NULL) {
519 // need to treat this_class specially...
520 assert(AnonymousClasses, "");
521 int this_class_index;
522 {
523 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
524 u1* mark = cfs->current();
525 u2 flags = cfs->get_u2_fast();
526 this_class_index = cfs->get_u2_fast();
527 cfs->set_current(mark); // revert to mark
528 }
530 for (index = 1; index < length; index++) { // Index 0 is unused
531 if (has_cp_patch_at(index)) {
532 guarantee_property(index != this_class_index,
533 "Illegal constant pool patch to self at %d in class file %s",
534 index, CHECK_(nullHandle));
535 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
536 }
537 }
538 // Ensure that all the patches have been used.
539 for (index = 0; index < _cp_patches->length(); index++) {
540 guarantee_property(!has_cp_patch_at(index),
541 "Unused constant pool patch at %d in class file %s",
542 index, CHECK_(nullHandle));
543 }
544 }
546 if (!_need_verify) {
547 cp_in_error.set_in_error(false);
548 return cp;
549 }
551 // second verification pass - checks the strings are of the right format.
552 // but not yet to the other entries
553 for (index = 1; index < length; index++) {
554 jbyte tag = cp->tag_at(index).value();
555 switch (tag) {
556 case JVM_CONSTANT_UnresolvedClass: {
557 Symbol* class_name = cp->unresolved_klass_at(index);
558 // check the name, even if _cp_patches will overwrite it
559 verify_legal_class_name(class_name, CHECK_(nullHandle));
560 break;
561 }
562 case JVM_CONSTANT_NameAndType: {
563 if (_need_verify && _major_version >= JAVA_7_VERSION) {
564 int sig_index = cp->signature_ref_index_at(index);
565 int name_index = cp->name_ref_index_at(index);
566 Symbol* name = cp->symbol_at(name_index);
567 Symbol* sig = cp->symbol_at(sig_index);
568 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
569 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
570 } else {
571 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
572 }
573 }
574 break;
575 }
576 case JVM_CONSTANT_Fieldref:
577 case JVM_CONSTANT_Methodref:
578 case JVM_CONSTANT_InterfaceMethodref: {
579 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
580 // already verified to be utf8
581 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
582 // already verified to be utf8
583 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
584 Symbol* name = cp->symbol_at(name_ref_index);
585 Symbol* signature = cp->symbol_at(signature_ref_index);
586 if (tag == JVM_CONSTANT_Fieldref) {
587 verify_legal_field_name(name, CHECK_(nullHandle));
588 if (_need_verify && _major_version >= JAVA_7_VERSION) {
589 // Signature is verified above, when iterating NameAndType_info.
590 // Need only to be sure it's the right type.
591 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
592 throwIllegalSignature(
593 "Field", name, signature, CHECK_(nullHandle));
594 }
595 } else {
596 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
597 }
598 } else {
599 verify_legal_method_name(name, CHECK_(nullHandle));
600 if (_need_verify && _major_version >= JAVA_7_VERSION) {
601 // Signature is verified above, when iterating NameAndType_info.
602 // Need only to be sure it's the right type.
603 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
604 throwIllegalSignature(
605 "Method", name, signature, CHECK_(nullHandle));
606 }
607 } else {
608 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
609 }
610 if (tag == JVM_CONSTANT_Methodref) {
611 // 4509014: If a class method name begins with '<', it must be "<init>".
612 assert(name != NULL, "method name in constant pool is null");
613 unsigned int name_len = name->utf8_length();
614 assert(name_len > 0, "bad method name"); // already verified as legal name
615 if (name->byte_at(0) == '<') {
616 if (name != vmSymbols::object_initializer_name()) {
617 classfile_parse_error(
618 "Bad method name at constant pool index %u in class file %s",
619 name_ref_index, CHECK_(nullHandle));
620 }
621 }
622 }
623 }
624 break;
625 }
626 case JVM_CONSTANT_MethodHandle: {
627 int ref_index = cp->method_handle_index_at(index);
628 int ref_kind = cp->method_handle_ref_kind_at(index);
629 switch (ref_kind) {
630 case JVM_REF_invokeVirtual:
631 case JVM_REF_invokeStatic:
632 case JVM_REF_invokeSpecial:
633 case JVM_REF_newInvokeSpecial:
634 {
635 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
636 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
637 Symbol* name = cp->symbol_at(name_ref_index);
638 if (ref_kind == JVM_REF_newInvokeSpecial) {
639 if (name != vmSymbols::object_initializer_name()) {
640 classfile_parse_error(
641 "Bad constructor name at constant pool index %u in class file %s",
642 name_ref_index, CHECK_(nullHandle));
643 }
644 } else {
645 if (name == vmSymbols::object_initializer_name()) {
646 classfile_parse_error(
647 "Bad method name at constant pool index %u in class file %s",
648 name_ref_index, CHECK_(nullHandle));
649 }
650 }
651 }
652 break;
653 // Other ref_kinds are already fully checked in previous pass.
654 }
655 break;
656 }
657 case JVM_CONSTANT_MethodType: {
658 Symbol* no_name = vmSymbols::type_name(); // place holder
659 Symbol* signature = cp->method_type_signature_at(index);
660 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
661 break;
662 }
663 case JVM_CONSTANT_Utf8: {
664 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
665 }
666 } // end of switch
667 } // end of for
669 cp_in_error.set_in_error(false);
670 return cp;
671 }
674 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
675 assert(AnonymousClasses, "");
676 BasicType patch_type = T_VOID;
677 switch (cp->tag_at(index).value()) {
679 case JVM_CONSTANT_UnresolvedClass :
680 // Patching a class means pre-resolving it.
681 // The name in the constant pool is ignored.
682 if (java_lang_Class::is_instance(patch())) {
683 guarantee_property(!java_lang_Class::is_primitive(patch()),
684 "Illegal class patch at %d in class file %s",
685 index, CHECK);
686 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
687 } else {
688 guarantee_property(java_lang_String::is_instance(patch()),
689 "Illegal class patch at %d in class file %s",
690 index, CHECK);
691 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
692 cp->unresolved_klass_at_put(index, name);
693 }
694 break;
696 case JVM_CONSTANT_UnresolvedString :
697 // Patching a string means pre-resolving it.
698 // The spelling in the constant pool is ignored.
699 // The constant reference may be any object whatever.
700 // If it is not a real interned string, the constant is referred
701 // to as a "pseudo-string", and must be presented to the CP
702 // explicitly, because it may require scavenging.
703 cp->pseudo_string_at_put(index, patch());
704 break;
706 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
707 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
708 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
709 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
710 patch_prim:
711 {
712 jvalue value;
713 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
714 guarantee_property(value_type == patch_type,
715 "Illegal primitive patch at %d in class file %s",
716 index, CHECK);
717 switch (value_type) {
718 case T_INT: cp->int_at_put(index, value.i); break;
719 case T_FLOAT: cp->float_at_put(index, value.f); break;
720 case T_LONG: cp->long_at_put(index, value.j); break;
721 case T_DOUBLE: cp->double_at_put(index, value.d); break;
722 default: assert(false, "");
723 }
724 }
725 break;
727 default:
728 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
729 guarantee_property(!has_cp_patch_at(index),
730 "Illegal unexpected patch at %d in class file %s",
731 index, CHECK);
732 return;
733 }
735 // On fall-through, mark the patch as used.
736 clear_cp_patch_at(index);
737 }
741 class NameSigHash: public ResourceObj {
742 public:
743 Symbol* _name; // name
744 Symbol* _sig; // signature
745 NameSigHash* _next; // Next entry in hash table
746 };
749 #define HASH_ROW_SIZE 256
751 unsigned int hash(Symbol* name, Symbol* sig) {
752 unsigned int raw_hash = 0;
753 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
754 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
756 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
757 }
760 void initialize_hashtable(NameSigHash** table) {
761 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
762 }
764 // Return false if the name/sig combination is found in table.
765 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
766 // The old format checker uses heap sort to find duplicates.
767 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
768 // of table since we don't expect Symbol*'s to move.
769 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
770 assert(name != NULL, "name in constant pool is NULL");
772 // First lookup for duplicates
773 int index = hash(name, sig);
774 NameSigHash* entry = table[index];
775 while (entry != NULL) {
776 if (entry->_name == name && entry->_sig == sig) {
777 return false;
778 }
779 entry = entry->_next;
780 }
782 // No duplicate is found, allocate a new entry and fill it.
783 entry = new NameSigHash();
784 entry->_name = name;
785 entry->_sig = sig;
787 // Insert into hash table
788 entry->_next = table[index];
789 table[index] = entry;
791 return true;
792 }
795 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
796 int length,
797 Handle class_loader,
798 Handle protection_domain,
799 Symbol* class_name,
800 TRAPS) {
801 ClassFileStream* cfs = stream();
802 assert(length > 0, "only called for length>0");
803 objArrayHandle nullHandle;
804 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
805 objArrayHandle interfaces (THREAD, interface_oop);
807 int index;
808 for (index = 0; index < length; index++) {
809 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
810 KlassHandle interf;
811 check_property(
812 valid_cp_range(interface_index, cp->length()) &&
813 is_klass_reference(cp, interface_index),
814 "Interface name has bad constant pool index %u in class file %s",
815 interface_index, CHECK_(nullHandle));
816 if (cp->tag_at(interface_index).is_klass()) {
817 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
818 } else {
819 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
821 // Don't need to check legal name because it's checked when parsing constant pool.
822 // But need to make sure it's not an array type.
823 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
824 "Bad interface name in class file %s", CHECK_(nullHandle));
826 // Call resolve_super so classcircularity is checked
827 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
828 unresolved_klass, class_loader, protection_domain,
829 false, CHECK_(nullHandle));
830 interf = KlassHandle(THREAD, k);
832 if (LinkWellKnownClasses) // my super type is well known to me
833 cp->klass_at_put(interface_index, interf()); // eagerly resolve
834 }
836 if (!Klass::cast(interf())->is_interface()) {
837 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
838 }
839 interfaces->obj_at_put(index, interf());
840 }
842 if (!_need_verify || length <= 1) {
843 return interfaces;
844 }
846 // Check if there's any duplicates in interfaces
847 ResourceMark rm(THREAD);
848 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
849 THREAD, NameSigHash*, HASH_ROW_SIZE);
850 initialize_hashtable(interface_names);
851 bool dup = false;
852 {
853 debug_only(No_Safepoint_Verifier nsv;)
854 for (index = 0; index < length; index++) {
855 klassOop k = (klassOop)interfaces->obj_at(index);
856 Symbol* name = instanceKlass::cast(k)->name();
857 // If no duplicates, add (name, NULL) in hashtable interface_names.
858 if (!put_after_lookup(name, NULL, interface_names)) {
859 dup = true;
860 break;
861 }
862 }
863 }
864 if (dup) {
865 classfile_parse_error("Duplicate interface name in class file %s",
866 CHECK_(nullHandle));
867 }
869 return interfaces;
870 }
873 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
874 // Make sure the constant pool entry is of a type appropriate to this field
875 guarantee_property(
876 (constantvalue_index > 0 &&
877 constantvalue_index < cp->length()),
878 "Bad initial value index %u in ConstantValue attribute in class file %s",
879 constantvalue_index, CHECK);
880 constantTag value_type = cp->tag_at(constantvalue_index);
881 switch ( cp->basic_type_for_signature_at(signature_index) ) {
882 case T_LONG:
883 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
884 break;
885 case T_FLOAT:
886 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
887 break;
888 case T_DOUBLE:
889 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
890 break;
891 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
892 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
893 break;
894 case T_OBJECT:
895 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
896 && (value_type.is_string() || value_type.is_unresolved_string())),
897 "Bad string initial value in class file %s", CHECK);
898 break;
899 default:
900 classfile_parse_error(
901 "Unable to set initial value %u in class file %s",
902 constantvalue_index, CHECK);
903 }
904 }
907 // Parse attributes for a field.
908 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
909 u2 attributes_count,
910 bool is_static, u2 signature_index,
911 u2* constantvalue_index_addr,
912 bool* is_synthetic_addr,
913 u2* generic_signature_index_addr,
914 typeArrayHandle* field_annotations,
915 TRAPS) {
916 ClassFileStream* cfs = stream();
917 assert(attributes_count > 0, "length should be greater than 0");
918 u2 constantvalue_index = 0;
919 u2 generic_signature_index = 0;
920 bool is_synthetic = false;
921 u1* runtime_visible_annotations = NULL;
922 int runtime_visible_annotations_length = 0;
923 u1* runtime_invisible_annotations = NULL;
924 int runtime_invisible_annotations_length = 0;
925 while (attributes_count--) {
926 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
927 u2 attribute_name_index = cfs->get_u2_fast();
928 u4 attribute_length = cfs->get_u4_fast();
929 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
930 cp->tag_at(attribute_name_index).is_utf8(),
931 "Invalid field attribute index %u in class file %s",
932 attribute_name_index,
933 CHECK);
934 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
935 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
936 // ignore if non-static
937 if (constantvalue_index != 0) {
938 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
939 }
940 check_property(
941 attribute_length == 2,
942 "Invalid ConstantValue field attribute length %u in class file %s",
943 attribute_length, CHECK);
944 constantvalue_index = cfs->get_u2(CHECK);
945 if (_need_verify) {
946 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
947 }
948 } else if (attribute_name == vmSymbols::tag_synthetic()) {
949 if (attribute_length != 0) {
950 classfile_parse_error(
951 "Invalid Synthetic field attribute length %u in class file %s",
952 attribute_length, CHECK);
953 }
954 is_synthetic = true;
955 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
956 if (attribute_length != 0) {
957 classfile_parse_error(
958 "Invalid Deprecated field attribute length %u in class file %s",
959 attribute_length, CHECK);
960 }
961 } else if (_major_version >= JAVA_1_5_VERSION) {
962 if (attribute_name == vmSymbols::tag_signature()) {
963 if (attribute_length != 2) {
964 classfile_parse_error(
965 "Wrong size %u for field's Signature attribute in class file %s",
966 attribute_length, CHECK);
967 }
968 generic_signature_index = cfs->get_u2(CHECK);
969 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
970 runtime_visible_annotations_length = attribute_length;
971 runtime_visible_annotations = cfs->get_u1_buffer();
972 assert(runtime_visible_annotations != NULL, "null visible annotations");
973 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
974 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
975 runtime_invisible_annotations_length = attribute_length;
976 runtime_invisible_annotations = cfs->get_u1_buffer();
977 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
978 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
979 } else {
980 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
981 }
982 } else {
983 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
984 }
985 }
987 *constantvalue_index_addr = constantvalue_index;
988 *is_synthetic_addr = is_synthetic;
989 *generic_signature_index_addr = generic_signature_index;
990 *field_annotations = assemble_annotations(runtime_visible_annotations,
991 runtime_visible_annotations_length,
992 runtime_invisible_annotations,
993 runtime_invisible_annotations_length,
994 CHECK);
995 return;
996 }
999 // Field allocation types. Used for computing field offsets.
1001 enum FieldAllocationType {
1002 STATIC_OOP, // Oops
1003 STATIC_BYTE, // Boolean, Byte, char
1004 STATIC_SHORT, // shorts
1005 STATIC_WORD, // ints
1006 STATIC_DOUBLE, // long or double
1007 STATIC_ALIGNED_DOUBLE,// aligned long or double
1008 NONSTATIC_OOP,
1009 NONSTATIC_BYTE,
1010 NONSTATIC_SHORT,
1011 NONSTATIC_WORD,
1012 NONSTATIC_DOUBLE,
1013 NONSTATIC_ALIGNED_DOUBLE
1014 };
1017 struct FieldAllocationCount {
1018 unsigned int static_oop_count;
1019 unsigned int static_byte_count;
1020 unsigned int static_short_count;
1021 unsigned int static_word_count;
1022 unsigned int static_double_count;
1023 unsigned int nonstatic_oop_count;
1024 unsigned int nonstatic_byte_count;
1025 unsigned int nonstatic_short_count;
1026 unsigned int nonstatic_word_count;
1027 unsigned int nonstatic_double_count;
1028 };
1030 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
1031 struct FieldAllocationCount *fac,
1032 objArrayHandle* fields_annotations, TRAPS) {
1033 ClassFileStream* cfs = stream();
1034 typeArrayHandle nullHandle;
1035 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1036 u2 length = cfs->get_u2_fast();
1037 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1038 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1039 typeArrayHandle fields(THREAD, new_fields);
1041 int index = 0;
1042 typeArrayHandle field_annotations;
1043 for (int n = 0; n < length; n++) {
1044 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1046 AccessFlags access_flags;
1047 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1048 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1049 access_flags.set_flags(flags);
1051 u2 name_index = cfs->get_u2_fast();
1052 int cp_size = cp->length();
1053 check_property(
1054 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1055 "Invalid constant pool index %u for field name in class file %s",
1056 name_index, CHECK_(nullHandle));
1057 Symbol* name = cp->symbol_at(name_index);
1058 verify_legal_field_name(name, CHECK_(nullHandle));
1060 u2 signature_index = cfs->get_u2_fast();
1061 check_property(
1062 valid_cp_range(signature_index, cp_size) &&
1063 cp->tag_at(signature_index).is_utf8(),
1064 "Invalid constant pool index %u for field signature in class file %s",
1065 signature_index, CHECK_(nullHandle));
1066 Symbol* sig = cp->symbol_at(signature_index);
1067 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1069 u2 constantvalue_index = 0;
1070 bool is_synthetic = false;
1071 u2 generic_signature_index = 0;
1072 bool is_static = access_flags.is_static();
1074 u2 attributes_count = cfs->get_u2_fast();
1075 if (attributes_count > 0) {
1076 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1077 &constantvalue_index, &is_synthetic,
1078 &generic_signature_index, &field_annotations,
1079 CHECK_(nullHandle));
1080 if (field_annotations.not_null()) {
1081 if (fields_annotations->is_null()) {
1082 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1083 *fields_annotations = objArrayHandle(THREAD, md);
1084 }
1085 (*fields_annotations)->obj_at_put(n, field_annotations());
1086 }
1087 if (is_synthetic) {
1088 access_flags.set_is_synthetic();
1089 }
1090 }
1092 fields->short_at_put(index++, access_flags.as_short());
1093 fields->short_at_put(index++, name_index);
1094 fields->short_at_put(index++, signature_index);
1095 fields->short_at_put(index++, constantvalue_index);
1097 // Remember how many oops we encountered and compute allocation type
1098 BasicType type = cp->basic_type_for_signature_at(signature_index);
1099 FieldAllocationType atype;
1100 if ( is_static ) {
1101 switch ( type ) {
1102 case T_BOOLEAN:
1103 case T_BYTE:
1104 fac->static_byte_count++;
1105 atype = STATIC_BYTE;
1106 break;
1107 case T_LONG:
1108 case T_DOUBLE:
1109 if (Universe::field_type_should_be_aligned(type)) {
1110 atype = STATIC_ALIGNED_DOUBLE;
1111 } else {
1112 atype = STATIC_DOUBLE;
1113 }
1114 fac->static_double_count++;
1115 break;
1116 case T_CHAR:
1117 case T_SHORT:
1118 fac->static_short_count++;
1119 atype = STATIC_SHORT;
1120 break;
1121 case T_FLOAT:
1122 case T_INT:
1123 fac->static_word_count++;
1124 atype = STATIC_WORD;
1125 break;
1126 case T_ARRAY:
1127 case T_OBJECT:
1128 fac->static_oop_count++;
1129 atype = STATIC_OOP;
1130 break;
1131 case T_ADDRESS:
1132 case T_VOID:
1133 default:
1134 assert(0, "bad field type");
1135 }
1136 } else {
1137 switch ( type ) {
1138 case T_BOOLEAN:
1139 case T_BYTE:
1140 fac->nonstatic_byte_count++;
1141 atype = NONSTATIC_BYTE;
1142 break;
1143 case T_LONG:
1144 case T_DOUBLE:
1145 if (Universe::field_type_should_be_aligned(type)) {
1146 atype = NONSTATIC_ALIGNED_DOUBLE;
1147 } else {
1148 atype = NONSTATIC_DOUBLE;
1149 }
1150 fac->nonstatic_double_count++;
1151 break;
1152 case T_CHAR:
1153 case T_SHORT:
1154 fac->nonstatic_short_count++;
1155 atype = NONSTATIC_SHORT;
1156 break;
1157 case T_FLOAT:
1158 case T_INT:
1159 fac->nonstatic_word_count++;
1160 atype = NONSTATIC_WORD;
1161 break;
1162 case T_ARRAY:
1163 case T_OBJECT:
1164 fac->nonstatic_oop_count++;
1165 atype = NONSTATIC_OOP;
1166 break;
1167 case T_ADDRESS:
1168 case T_VOID:
1169 default:
1170 assert(0, "bad field type");
1171 }
1172 }
1174 // The correct offset is computed later (all oop fields will be located together)
1175 // We temporarily store the allocation type in the offset field
1176 fields->short_at_put(index++, atype);
1177 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1178 fields->short_at_put(index++, generic_signature_index);
1179 }
1181 if (_need_verify && length > 1) {
1182 // Check duplicated fields
1183 ResourceMark rm(THREAD);
1184 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1185 THREAD, NameSigHash*, HASH_ROW_SIZE);
1186 initialize_hashtable(names_and_sigs);
1187 bool dup = false;
1188 {
1189 debug_only(No_Safepoint_Verifier nsv;)
1190 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1191 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1192 Symbol* name = cp->symbol_at(name_index);
1193 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1194 Symbol* sig = cp->symbol_at(sig_index);
1195 // If no duplicates, add name/signature in hashtable names_and_sigs.
1196 if (!put_after_lookup(name, sig, names_and_sigs)) {
1197 dup = true;
1198 break;
1199 }
1200 }
1201 }
1202 if (dup) {
1203 classfile_parse_error("Duplicate field name&signature in class file %s",
1204 CHECK_(nullHandle));
1205 }
1206 }
1208 return fields;
1209 }
1212 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1213 while (length-- > 0) {
1214 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1215 }
1216 }
1219 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1220 u4 exception_table_length,
1221 constantPoolHandle cp,
1222 TRAPS) {
1223 ClassFileStream* cfs = stream();
1224 typeArrayHandle nullHandle;
1226 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1227 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1228 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1230 int index = 0;
1231 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1232 for (unsigned int i = 0; i < exception_table_length; i++) {
1233 u2 start_pc = cfs->get_u2_fast();
1234 u2 end_pc = cfs->get_u2_fast();
1235 u2 handler_pc = cfs->get_u2_fast();
1236 u2 catch_type_index = cfs->get_u2_fast();
1237 // Will check legal target after parsing code array in verifier.
1238 if (_need_verify) {
1239 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1240 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1241 guarantee_property(handler_pc < code_length,
1242 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1243 if (catch_type_index != 0) {
1244 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1245 is_klass_reference(cp, catch_type_index),
1246 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1247 }
1248 }
1249 exception_handlers->int_at_put(index++, start_pc);
1250 exception_handlers->int_at_put(index++, end_pc);
1251 exception_handlers->int_at_put(index++, handler_pc);
1252 exception_handlers->int_at_put(index++, catch_type_index);
1253 }
1254 return exception_handlers;
1255 }
1257 void ClassFileParser::parse_linenumber_table(
1258 u4 code_attribute_length, u4 code_length,
1259 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1260 ClassFileStream* cfs = stream();
1261 unsigned int num_entries = cfs->get_u2(CHECK);
1263 // Each entry is a u2 start_pc, and a u2 line_number
1264 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1266 // Verify line number attribute and table length
1267 check_property(
1268 code_attribute_length == sizeof(u2) + length_in_bytes,
1269 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1271 cfs->guarantee_more(length_in_bytes, CHECK);
1273 if ((*write_stream) == NULL) {
1274 if (length_in_bytes > fixed_buffer_size) {
1275 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1276 } else {
1277 (*write_stream) = new CompressedLineNumberWriteStream(
1278 linenumbertable_buffer, fixed_buffer_size);
1279 }
1280 }
1282 while (num_entries-- > 0) {
1283 u2 bci = cfs->get_u2_fast(); // start_pc
1284 u2 line = cfs->get_u2_fast(); // line_number
1285 guarantee_property(bci < code_length,
1286 "Invalid pc in LineNumberTable in class file %s", CHECK);
1287 (*write_stream)->write_pair(bci, line);
1288 }
1289 }
1292 // Class file LocalVariableTable elements.
1293 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1294 public:
1295 u2 start_bci;
1296 u2 length;
1297 u2 name_cp_index;
1298 u2 descriptor_cp_index;
1299 u2 slot;
1300 };
1303 class LVT_Hash: public CHeapObj {
1304 public:
1305 LocalVariableTableElement *_elem; // element
1306 LVT_Hash* _next; // Next entry in hash table
1307 };
1309 unsigned int hash(LocalVariableTableElement *elem) {
1310 unsigned int raw_hash = elem->start_bci;
1312 raw_hash = elem->length + raw_hash * 37;
1313 raw_hash = elem->name_cp_index + raw_hash * 37;
1314 raw_hash = elem->slot + raw_hash * 37;
1316 return raw_hash % HASH_ROW_SIZE;
1317 }
1319 void initialize_hashtable(LVT_Hash** table) {
1320 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1321 table[i] = NULL;
1322 }
1323 }
1325 void clear_hashtable(LVT_Hash** table) {
1326 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1327 LVT_Hash* current = table[i];
1328 LVT_Hash* next;
1329 while (current != NULL) {
1330 next = current->_next;
1331 current->_next = NULL;
1332 delete(current);
1333 current = next;
1334 }
1335 table[i] = NULL;
1336 }
1337 }
1339 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1340 LVT_Hash* entry = table[index];
1342 /*
1343 * 3-tuple start_bci/length/slot has to be unique key,
1344 * so the following comparison seems to be redundant:
1345 * && elem->name_cp_index == entry->_elem->name_cp_index
1346 */
1347 while (entry != NULL) {
1348 if (elem->start_bci == entry->_elem->start_bci
1349 && elem->length == entry->_elem->length
1350 && elem->name_cp_index == entry->_elem->name_cp_index
1351 && elem->slot == entry->_elem->slot
1352 ) {
1353 return entry;
1354 }
1355 entry = entry->_next;
1356 }
1357 return NULL;
1358 }
1360 // Return false if the local variable is found in table.
1361 // Return true if no duplicate is found.
1362 // And local variable is added as a new entry in table.
1363 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1364 // First lookup for duplicates
1365 int index = hash(elem);
1366 LVT_Hash* entry = LVT_lookup(elem, index, table);
1368 if (entry != NULL) {
1369 return false;
1370 }
1371 // No duplicate is found, allocate a new entry and fill it.
1372 if ((entry = new LVT_Hash()) == NULL) {
1373 return false;
1374 }
1375 entry->_elem = elem;
1377 // Insert into hash table
1378 entry->_next = table[index];
1379 table[index] = entry;
1381 return true;
1382 }
1384 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1385 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1386 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1387 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1388 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1389 lvt->signature_cp_index = 0;
1390 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1391 }
1393 // Function is used to parse both attributes:
1394 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1395 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1396 u2 max_locals,
1397 u4 code_attribute_length,
1398 constantPoolHandle cp,
1399 u2* localvariable_table_length,
1400 bool isLVTT,
1401 TRAPS) {
1402 ClassFileStream* cfs = stream();
1403 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1404 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1405 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1406 // Verify local variable table attribute has right length
1407 if (_need_verify) {
1408 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1409 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1410 }
1411 u2* localvariable_table_start = cfs->get_u2_buffer();
1412 assert(localvariable_table_start != NULL, "null local variable table");
1413 if (!_need_verify) {
1414 cfs->skip_u2_fast(size);
1415 } else {
1416 cfs->guarantee_more(size * 2, CHECK_NULL);
1417 for(int i = 0; i < (*localvariable_table_length); i++) {
1418 u2 start_pc = cfs->get_u2_fast();
1419 u2 length = cfs->get_u2_fast();
1420 u2 name_index = cfs->get_u2_fast();
1421 u2 descriptor_index = cfs->get_u2_fast();
1422 u2 index = cfs->get_u2_fast();
1423 // Assign to a u4 to avoid overflow
1424 u4 end_pc = (u4)start_pc + (u4)length;
1426 if (start_pc >= code_length) {
1427 classfile_parse_error(
1428 "Invalid start_pc %u in %s in class file %s",
1429 start_pc, tbl_name, CHECK_NULL);
1430 }
1431 if (end_pc > code_length) {
1432 classfile_parse_error(
1433 "Invalid length %u in %s in class file %s",
1434 length, tbl_name, CHECK_NULL);
1435 }
1436 int cp_size = cp->length();
1437 guarantee_property(
1438 valid_cp_range(name_index, cp_size) &&
1439 cp->tag_at(name_index).is_utf8(),
1440 "Name index %u in %s has bad constant type in class file %s",
1441 name_index, tbl_name, CHECK_NULL);
1442 guarantee_property(
1443 valid_cp_range(descriptor_index, cp_size) &&
1444 cp->tag_at(descriptor_index).is_utf8(),
1445 "Signature index %u in %s has bad constant type in class file %s",
1446 descriptor_index, tbl_name, CHECK_NULL);
1448 Symbol* name = cp->symbol_at(name_index);
1449 Symbol* sig = cp->symbol_at(descriptor_index);
1450 verify_legal_field_name(name, CHECK_NULL);
1451 u2 extra_slot = 0;
1452 if (!isLVTT) {
1453 verify_legal_field_signature(name, sig, CHECK_NULL);
1455 // 4894874: check special cases for double and long local variables
1456 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1457 sig == vmSymbols::type_signature(T_LONG)) {
1458 extra_slot = 1;
1459 }
1460 }
1461 guarantee_property((index + extra_slot) < max_locals,
1462 "Invalid index %u in %s in class file %s",
1463 index, tbl_name, CHECK_NULL);
1464 }
1465 }
1466 return localvariable_table_start;
1467 }
1470 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1471 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1472 ClassFileStream* cfs = stream();
1473 u2 index = 0; // index in the array with long/double occupying two slots
1474 u4 i1 = *u1_index;
1475 u4 i2 = *u2_index + 1;
1476 for(int i = 0; i < array_length; i++) {
1477 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1478 index++;
1479 if (tag == ITEM_Long || tag == ITEM_Double) {
1480 index++;
1481 } else if (tag == ITEM_Object) {
1482 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1483 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1484 is_klass_reference(cp, class_index),
1485 "Bad class index %u in StackMap in class file %s",
1486 class_index, CHECK);
1487 } else if (tag == ITEM_Uninitialized) {
1488 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1489 guarantee_property(
1490 offset < code_length,
1491 "Bad uninitialized type offset %u in StackMap in class file %s",
1492 offset, CHECK);
1493 } else {
1494 guarantee_property(
1495 tag <= (u1)ITEM_Uninitialized,
1496 "Unknown variable type %u in StackMap in class file %s",
1497 tag, CHECK);
1498 }
1499 }
1500 u2_array[*u2_index] = index;
1501 *u1_index = i1;
1502 *u2_index = i2;
1503 }
1505 typeArrayOop ClassFileParser::parse_stackmap_table(
1506 u4 code_attribute_length, TRAPS) {
1507 if (code_attribute_length == 0)
1508 return NULL;
1510 ClassFileStream* cfs = stream();
1511 u1* stackmap_table_start = cfs->get_u1_buffer();
1512 assert(stackmap_table_start != NULL, "null stackmap table");
1514 // check code_attribute_length first
1515 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1517 if (!_need_verify && !DumpSharedSpaces) {
1518 return NULL;
1519 }
1521 typeArrayOop stackmap_data =
1522 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1524 stackmap_data->set_length(code_attribute_length);
1525 memcpy((void*)stackmap_data->byte_at_addr(0),
1526 (void*)stackmap_table_start, code_attribute_length);
1527 return stackmap_data;
1528 }
1530 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1531 u4 method_attribute_length,
1532 constantPoolHandle cp, TRAPS) {
1533 ClassFileStream* cfs = stream();
1534 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1535 *checked_exceptions_length = cfs->get_u2_fast();
1536 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1537 u2* checked_exceptions_start = cfs->get_u2_buffer();
1538 assert(checked_exceptions_start != NULL, "null checked exceptions");
1539 if (!_need_verify) {
1540 cfs->skip_u2_fast(size);
1541 } else {
1542 // Verify each value in the checked exception table
1543 u2 checked_exception;
1544 u2 len = *checked_exceptions_length;
1545 cfs->guarantee_more(2 * len, CHECK_NULL);
1546 for (int i = 0; i < len; i++) {
1547 checked_exception = cfs->get_u2_fast();
1548 check_property(
1549 valid_cp_range(checked_exception, cp->length()) &&
1550 is_klass_reference(cp, checked_exception),
1551 "Exception name has bad type at constant pool %u in class file %s",
1552 checked_exception, CHECK_NULL);
1553 }
1554 }
1555 // check exceptions attribute length
1556 if (_need_verify) {
1557 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1558 sizeof(u2) * size),
1559 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1560 }
1561 return checked_exceptions_start;
1562 }
1564 void ClassFileParser::throwIllegalSignature(
1565 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1566 ResourceMark rm(THREAD);
1567 Exceptions::fthrow(THREAD_AND_LOCATION,
1568 vmSymbols::java_lang_ClassFormatError(),
1569 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1570 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1571 }
1573 #define MAX_ARGS_SIZE 255
1574 #define MAX_CODE_SIZE 65535
1575 #define INITIAL_MAX_LVT_NUMBER 256
1577 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1578 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1579 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1580 // entire method attribute is parsed.
1581 //
1582 // The promoted_flags parameter is used to pass relevant access_flags
1583 // from the method back up to the containing klass. These flag values
1584 // are added to klass's access_flags.
1586 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1587 AccessFlags *promoted_flags,
1588 typeArrayHandle* method_annotations,
1589 typeArrayHandle* method_parameter_annotations,
1590 typeArrayHandle* method_default_annotations,
1591 TRAPS) {
1592 ClassFileStream* cfs = stream();
1593 methodHandle nullHandle;
1594 ResourceMark rm(THREAD);
1595 // Parse fixed parts
1596 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1598 int flags = cfs->get_u2_fast();
1599 u2 name_index = cfs->get_u2_fast();
1600 int cp_size = cp->length();
1601 check_property(
1602 valid_cp_range(name_index, cp_size) &&
1603 cp->tag_at(name_index).is_utf8(),
1604 "Illegal constant pool index %u for method name in class file %s",
1605 name_index, CHECK_(nullHandle));
1606 Symbol* name = cp->symbol_at(name_index);
1607 verify_legal_method_name(name, CHECK_(nullHandle));
1609 u2 signature_index = cfs->get_u2_fast();
1610 guarantee_property(
1611 valid_cp_range(signature_index, cp_size) &&
1612 cp->tag_at(signature_index).is_utf8(),
1613 "Illegal constant pool index %u for method signature in class file %s",
1614 signature_index, CHECK_(nullHandle));
1615 Symbol* signature = cp->symbol_at(signature_index);
1617 AccessFlags access_flags;
1618 if (name == vmSymbols::class_initializer_name()) {
1619 // We ignore the other access flags for a valid class initializer.
1620 // (JVM Spec 2nd ed., chapter 4.6)
1621 if (_major_version < 51) { // backward compatibility
1622 flags = JVM_ACC_STATIC;
1623 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1624 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1625 }
1626 } else {
1627 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1628 }
1630 int args_size = -1; // only used when _need_verify is true
1631 if (_need_verify) {
1632 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1633 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1634 if (args_size > MAX_ARGS_SIZE) {
1635 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1636 }
1637 }
1639 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1641 // Default values for code and exceptions attribute elements
1642 u2 max_stack = 0;
1643 u2 max_locals = 0;
1644 u4 code_length = 0;
1645 u1* code_start = 0;
1646 u2 exception_table_length = 0;
1647 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1648 u2 checked_exceptions_length = 0;
1649 u2* checked_exceptions_start = NULL;
1650 CompressedLineNumberWriteStream* linenumber_table = NULL;
1651 int linenumber_table_length = 0;
1652 int total_lvt_length = 0;
1653 u2 lvt_cnt = 0;
1654 u2 lvtt_cnt = 0;
1655 bool lvt_allocated = false;
1656 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1657 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1658 u2* localvariable_table_length;
1659 u2** localvariable_table_start;
1660 u2* localvariable_type_table_length;
1661 u2** localvariable_type_table_start;
1662 bool parsed_code_attribute = false;
1663 bool parsed_checked_exceptions_attribute = false;
1664 bool parsed_stackmap_attribute = false;
1665 // stackmap attribute - JDK1.5
1666 typeArrayHandle stackmap_data;
1667 u2 generic_signature_index = 0;
1668 u1* runtime_visible_annotations = NULL;
1669 int runtime_visible_annotations_length = 0;
1670 u1* runtime_invisible_annotations = NULL;
1671 int runtime_invisible_annotations_length = 0;
1672 u1* runtime_visible_parameter_annotations = NULL;
1673 int runtime_visible_parameter_annotations_length = 0;
1674 u1* runtime_invisible_parameter_annotations = NULL;
1675 int runtime_invisible_parameter_annotations_length = 0;
1676 u1* annotation_default = NULL;
1677 int annotation_default_length = 0;
1679 // Parse code and exceptions attribute
1680 u2 method_attributes_count = cfs->get_u2_fast();
1681 while (method_attributes_count--) {
1682 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1683 u2 method_attribute_name_index = cfs->get_u2_fast();
1684 u4 method_attribute_length = cfs->get_u4_fast();
1685 check_property(
1686 valid_cp_range(method_attribute_name_index, cp_size) &&
1687 cp->tag_at(method_attribute_name_index).is_utf8(),
1688 "Invalid method attribute name index %u in class file %s",
1689 method_attribute_name_index, CHECK_(nullHandle));
1691 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1692 if (method_attribute_name == vmSymbols::tag_code()) {
1693 // Parse Code attribute
1694 if (_need_verify) {
1695 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1696 "Code attribute in native or abstract methods in class file %s",
1697 CHECK_(nullHandle));
1698 }
1699 if (parsed_code_attribute) {
1700 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1701 }
1702 parsed_code_attribute = true;
1704 // Stack size, locals size, and code size
1705 if (_major_version == 45 && _minor_version <= 2) {
1706 cfs->guarantee_more(4, CHECK_(nullHandle));
1707 max_stack = cfs->get_u1_fast();
1708 max_locals = cfs->get_u1_fast();
1709 code_length = cfs->get_u2_fast();
1710 } else {
1711 cfs->guarantee_more(8, CHECK_(nullHandle));
1712 max_stack = cfs->get_u2_fast();
1713 max_locals = cfs->get_u2_fast();
1714 code_length = cfs->get_u4_fast();
1715 }
1716 if (_need_verify) {
1717 guarantee_property(args_size <= max_locals,
1718 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1719 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1720 "Invalid method Code length %u in class file %s",
1721 code_length, CHECK_(nullHandle));
1722 }
1723 // Code pointer
1724 code_start = cfs->get_u1_buffer();
1725 assert(code_start != NULL, "null code start");
1726 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1727 cfs->skip_u1_fast(code_length);
1729 // Exception handler table
1730 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1731 exception_table_length = cfs->get_u2_fast();
1732 if (exception_table_length > 0) {
1733 exception_handlers =
1734 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1735 }
1737 // Parse additional attributes in code attribute
1738 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1739 u2 code_attributes_count = cfs->get_u2_fast();
1741 unsigned int calculated_attribute_length = 0;
1743 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1744 calculated_attribute_length =
1745 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1746 } else {
1747 // max_stack, locals and length are smaller in pre-version 45.2 classes
1748 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1749 }
1750 calculated_attribute_length +=
1751 code_length +
1752 sizeof(exception_table_length) +
1753 sizeof(code_attributes_count) +
1754 exception_table_length *
1755 ( sizeof(u2) + // start_pc
1756 sizeof(u2) + // end_pc
1757 sizeof(u2) + // handler_pc
1758 sizeof(u2) ); // catch_type_index
1760 while (code_attributes_count--) {
1761 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1762 u2 code_attribute_name_index = cfs->get_u2_fast();
1763 u4 code_attribute_length = cfs->get_u4_fast();
1764 calculated_attribute_length += code_attribute_length +
1765 sizeof(code_attribute_name_index) +
1766 sizeof(code_attribute_length);
1767 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1768 cp->tag_at(code_attribute_name_index).is_utf8(),
1769 "Invalid code attribute name index %u in class file %s",
1770 code_attribute_name_index,
1771 CHECK_(nullHandle));
1772 if (LoadLineNumberTables &&
1773 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1774 // Parse and compress line number table
1775 parse_linenumber_table(code_attribute_length, code_length,
1776 &linenumber_table, CHECK_(nullHandle));
1778 } else if (LoadLocalVariableTables &&
1779 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1780 // Parse local variable table
1781 if (!lvt_allocated) {
1782 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1783 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1784 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1785 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1786 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1787 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1788 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1789 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1790 lvt_allocated = true;
1791 }
1792 if (lvt_cnt == max_lvt_cnt) {
1793 max_lvt_cnt <<= 1;
1794 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1795 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1796 }
1797 localvariable_table_start[lvt_cnt] =
1798 parse_localvariable_table(code_length,
1799 max_locals,
1800 code_attribute_length,
1801 cp,
1802 &localvariable_table_length[lvt_cnt],
1803 false, // is not LVTT
1804 CHECK_(nullHandle));
1805 total_lvt_length += localvariable_table_length[lvt_cnt];
1806 lvt_cnt++;
1807 } else if (LoadLocalVariableTypeTables &&
1808 _major_version >= JAVA_1_5_VERSION &&
1809 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1810 if (!lvt_allocated) {
1811 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1812 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1813 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1814 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1815 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1816 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1817 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1818 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1819 lvt_allocated = true;
1820 }
1821 // Parse local variable type table
1822 if (lvtt_cnt == max_lvtt_cnt) {
1823 max_lvtt_cnt <<= 1;
1824 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1825 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1826 }
1827 localvariable_type_table_start[lvtt_cnt] =
1828 parse_localvariable_table(code_length,
1829 max_locals,
1830 code_attribute_length,
1831 cp,
1832 &localvariable_type_table_length[lvtt_cnt],
1833 true, // is LVTT
1834 CHECK_(nullHandle));
1835 lvtt_cnt++;
1836 } else if (UseSplitVerifier &&
1837 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1838 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1839 // Stack map is only needed by the new verifier in JDK1.5.
1840 if (parsed_stackmap_attribute) {
1841 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1842 }
1843 typeArrayOop sm =
1844 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1845 stackmap_data = typeArrayHandle(THREAD, sm);
1846 parsed_stackmap_attribute = true;
1847 } else {
1848 // Skip unknown attributes
1849 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1850 }
1851 }
1852 // check method attribute length
1853 if (_need_verify) {
1854 guarantee_property(method_attribute_length == calculated_attribute_length,
1855 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1856 }
1857 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1858 // Parse Exceptions attribute
1859 if (parsed_checked_exceptions_attribute) {
1860 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1861 }
1862 parsed_checked_exceptions_attribute = true;
1863 checked_exceptions_start =
1864 parse_checked_exceptions(&checked_exceptions_length,
1865 method_attribute_length,
1866 cp, CHECK_(nullHandle));
1867 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1868 if (method_attribute_length != 0) {
1869 classfile_parse_error(
1870 "Invalid Synthetic method attribute length %u in class file %s",
1871 method_attribute_length, CHECK_(nullHandle));
1872 }
1873 // Should we check that there hasn't already been a synthetic attribute?
1874 access_flags.set_is_synthetic();
1875 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1876 if (method_attribute_length != 0) {
1877 classfile_parse_error(
1878 "Invalid Deprecated method attribute length %u in class file %s",
1879 method_attribute_length, CHECK_(nullHandle));
1880 }
1881 } else if (_major_version >= JAVA_1_5_VERSION) {
1882 if (method_attribute_name == vmSymbols::tag_signature()) {
1883 if (method_attribute_length != 2) {
1884 classfile_parse_error(
1885 "Invalid Signature attribute length %u in class file %s",
1886 method_attribute_length, CHECK_(nullHandle));
1887 }
1888 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1889 generic_signature_index = cfs->get_u2_fast();
1890 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1891 runtime_visible_annotations_length = method_attribute_length;
1892 runtime_visible_annotations = cfs->get_u1_buffer();
1893 assert(runtime_visible_annotations != NULL, "null visible annotations");
1894 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1895 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1896 runtime_invisible_annotations_length = method_attribute_length;
1897 runtime_invisible_annotations = cfs->get_u1_buffer();
1898 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1899 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1900 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1901 runtime_visible_parameter_annotations_length = method_attribute_length;
1902 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1903 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1904 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1905 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1906 runtime_invisible_parameter_annotations_length = method_attribute_length;
1907 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1908 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1909 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1910 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1911 annotation_default_length = method_attribute_length;
1912 annotation_default = cfs->get_u1_buffer();
1913 assert(annotation_default != NULL, "null annotation default");
1914 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1915 } else {
1916 // Skip unknown attributes
1917 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1918 }
1919 } else {
1920 // Skip unknown attributes
1921 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1922 }
1923 }
1925 if (linenumber_table != NULL) {
1926 linenumber_table->write_terminator();
1927 linenumber_table_length = linenumber_table->position();
1928 }
1930 // Make sure there's at least one Code attribute in non-native/non-abstract method
1931 if (_need_verify) {
1932 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1933 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1934 }
1936 // All sizing information for a methodOop is finally available, now create it
1937 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1938 total_lvt_length, checked_exceptions_length,
1939 oopDesc::IsSafeConc, CHECK_(nullHandle));
1940 methodHandle m (THREAD, m_oop);
1942 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1944 // Fill in information from fixed part (access_flags already set)
1945 m->set_constants(cp());
1946 m->set_name_index(name_index);
1947 m->set_signature_index(signature_index);
1948 m->set_generic_signature_index(generic_signature_index);
1949 #ifdef CC_INTERP
1950 // hmm is there a gc issue here??
1951 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1952 m->set_result_index(rtf.type());
1953 #endif
1955 if (args_size >= 0) {
1956 m->set_size_of_parameters(args_size);
1957 } else {
1958 m->compute_size_of_parameters(THREAD);
1959 }
1960 #ifdef ASSERT
1961 if (args_size >= 0) {
1962 m->compute_size_of_parameters(THREAD);
1963 assert(args_size == m->size_of_parameters(), "");
1964 }
1965 #endif
1967 // Fill in code attribute information
1968 m->set_max_stack(max_stack);
1969 m->set_max_locals(max_locals);
1970 m->constMethod()->set_stackmap_data(stackmap_data());
1972 /**
1973 * The exception_table field is the flag used to indicate
1974 * that the methodOop and it's associated constMethodOop are partially
1975 * initialized and thus are exempt from pre/post GC verification. Once
1976 * the field is set, the oops are considered fully initialized so make
1977 * sure that the oops can pass verification when this field is set.
1978 */
1979 m->set_exception_table(exception_handlers());
1981 // Copy byte codes
1982 m->set_code(code_start);
1984 // Copy line number table
1985 if (linenumber_table != NULL) {
1986 memcpy(m->compressed_linenumber_table(),
1987 linenumber_table->buffer(), linenumber_table_length);
1988 }
1990 // Copy checked exceptions
1991 if (checked_exceptions_length > 0) {
1992 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1993 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1994 }
1996 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1997 *
1998 * Rules for LVT's and LVTT's are:
1999 * - There can be any number of LVT's and LVTT's.
2000 * - If there are n LVT's, it is the same as if there was just
2001 * one LVT containing all the entries from the n LVT's.
2002 * - There may be no more than one LVT entry per local variable.
2003 * Two LVT entries are 'equal' if these fields are the same:
2004 * start_pc, length, name, slot
2005 * - There may be no more than one LVTT entry per each LVT entry.
2006 * Each LVTT entry has to match some LVT entry.
2007 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2008 */
2009 if (total_lvt_length > 0) {
2010 int tbl_no, idx;
2012 promoted_flags->set_has_localvariable_table();
2014 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2015 initialize_hashtable(lvt_Hash);
2017 // To fill LocalVariableTable in
2018 Classfile_LVT_Element* cf_lvt;
2019 LocalVariableTableElement* lvt = m->localvariable_table_start();
2021 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2022 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2023 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2024 copy_lvt_element(&cf_lvt[idx], lvt);
2025 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2026 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2027 && _need_verify
2028 && _major_version >= JAVA_1_5_VERSION ) {
2029 clear_hashtable(lvt_Hash);
2030 classfile_parse_error("Duplicated LocalVariableTable attribute "
2031 "entry for '%s' in class file %s",
2032 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2033 CHECK_(nullHandle));
2034 }
2035 }
2036 }
2038 // To merge LocalVariableTable and LocalVariableTypeTable
2039 Classfile_LVT_Element* cf_lvtt;
2040 LocalVariableTableElement lvtt_elem;
2042 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2043 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2044 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2045 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2046 int index = hash(&lvtt_elem);
2047 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2048 if (entry == NULL) {
2049 if (_need_verify) {
2050 clear_hashtable(lvt_Hash);
2051 classfile_parse_error("LVTT entry for '%s' in class file %s "
2052 "does not match any LVT entry",
2053 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2054 CHECK_(nullHandle));
2055 }
2056 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2057 clear_hashtable(lvt_Hash);
2058 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2059 "entry for '%s' in class file %s",
2060 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2061 CHECK_(nullHandle));
2062 } else {
2063 // to add generic signatures into LocalVariableTable
2064 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2065 }
2066 }
2067 }
2068 clear_hashtable(lvt_Hash);
2069 }
2071 *method_annotations = assemble_annotations(runtime_visible_annotations,
2072 runtime_visible_annotations_length,
2073 runtime_invisible_annotations,
2074 runtime_invisible_annotations_length,
2075 CHECK_(nullHandle));
2076 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2077 runtime_visible_parameter_annotations_length,
2078 runtime_invisible_parameter_annotations,
2079 runtime_invisible_parameter_annotations_length,
2080 CHECK_(nullHandle));
2081 *method_default_annotations = assemble_annotations(annotation_default,
2082 annotation_default_length,
2083 NULL,
2084 0,
2085 CHECK_(nullHandle));
2087 if (name == vmSymbols::finalize_method_name() &&
2088 signature == vmSymbols::void_method_signature()) {
2089 if (m->is_empty_method()) {
2090 _has_empty_finalizer = true;
2091 } else {
2092 _has_finalizer = true;
2093 }
2094 }
2095 if (name == vmSymbols::object_initializer_name() &&
2096 signature == vmSymbols::void_method_signature() &&
2097 m->is_vanilla_constructor()) {
2098 _has_vanilla_constructor = true;
2099 }
2101 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2102 m->is_method_handle_adapter())) {
2103 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2104 "Method handle invokers must be defined internally to the VM", nullHandle);
2105 }
2107 return m;
2108 }
2111 // The promoted_flags parameter is used to pass relevant access_flags
2112 // from the methods back up to the containing klass. These flag values
2113 // are added to klass's access_flags.
2115 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2116 AccessFlags* promoted_flags,
2117 bool* has_final_method,
2118 objArrayOop* methods_annotations_oop,
2119 objArrayOop* methods_parameter_annotations_oop,
2120 objArrayOop* methods_default_annotations_oop,
2121 TRAPS) {
2122 ClassFileStream* cfs = stream();
2123 objArrayHandle nullHandle;
2124 typeArrayHandle method_annotations;
2125 typeArrayHandle method_parameter_annotations;
2126 typeArrayHandle method_default_annotations;
2127 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2128 u2 length = cfs->get_u2_fast();
2129 if (length == 0) {
2130 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2131 } else {
2132 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2133 objArrayHandle methods(THREAD, m);
2134 HandleMark hm(THREAD);
2135 objArrayHandle methods_annotations;
2136 objArrayHandle methods_parameter_annotations;
2137 objArrayHandle methods_default_annotations;
2138 for (int index = 0; index < length; index++) {
2139 methodHandle method = parse_method(cp, is_interface,
2140 promoted_flags,
2141 &method_annotations,
2142 &method_parameter_annotations,
2143 &method_default_annotations,
2144 CHECK_(nullHandle));
2145 if (method->is_final()) {
2146 *has_final_method = true;
2147 }
2148 methods->obj_at_put(index, method());
2149 if (method_annotations.not_null()) {
2150 if (methods_annotations.is_null()) {
2151 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2152 methods_annotations = objArrayHandle(THREAD, md);
2153 }
2154 methods_annotations->obj_at_put(index, method_annotations());
2155 }
2156 if (method_parameter_annotations.not_null()) {
2157 if (methods_parameter_annotations.is_null()) {
2158 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2159 methods_parameter_annotations = objArrayHandle(THREAD, md);
2160 }
2161 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2162 }
2163 if (method_default_annotations.not_null()) {
2164 if (methods_default_annotations.is_null()) {
2165 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2166 methods_default_annotations = objArrayHandle(THREAD, md);
2167 }
2168 methods_default_annotations->obj_at_put(index, method_default_annotations());
2169 }
2170 }
2171 if (_need_verify && length > 1) {
2172 // Check duplicated methods
2173 ResourceMark rm(THREAD);
2174 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2175 THREAD, NameSigHash*, HASH_ROW_SIZE);
2176 initialize_hashtable(names_and_sigs);
2177 bool dup = false;
2178 {
2179 debug_only(No_Safepoint_Verifier nsv;)
2180 for (int i = 0; i < length; i++) {
2181 methodOop m = (methodOop)methods->obj_at(i);
2182 // If no duplicates, add name/signature in hashtable names_and_sigs.
2183 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2184 dup = true;
2185 break;
2186 }
2187 }
2188 }
2189 if (dup) {
2190 classfile_parse_error("Duplicate method name&signature in class file %s",
2191 CHECK_(nullHandle));
2192 }
2193 }
2195 *methods_annotations_oop = methods_annotations();
2196 *methods_parameter_annotations_oop = methods_parameter_annotations();
2197 *methods_default_annotations_oop = methods_default_annotations();
2199 return methods;
2200 }
2201 }
2204 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2205 objArrayHandle methods_annotations,
2206 objArrayHandle methods_parameter_annotations,
2207 objArrayHandle methods_default_annotations,
2208 TRAPS) {
2209 typeArrayHandle nullHandle;
2210 int length = methods()->length();
2211 // If JVMTI original method ordering is enabled we have to
2212 // remember the original class file ordering.
2213 // We temporarily use the vtable_index field in the methodOop to store the
2214 // class file index, so we can read in after calling qsort.
2215 if (JvmtiExport::can_maintain_original_method_order()) {
2216 for (int index = 0; index < length; index++) {
2217 methodOop m = methodOop(methods->obj_at(index));
2218 assert(!m->valid_vtable_index(), "vtable index should not be set");
2219 m->set_vtable_index(index);
2220 }
2221 }
2222 // Sort method array by ascending method name (for faster lookups & vtable construction)
2223 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2224 methodOopDesc::sort_methods(methods(),
2225 methods_annotations(),
2226 methods_parameter_annotations(),
2227 methods_default_annotations());
2229 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2230 if (JvmtiExport::can_maintain_original_method_order()) {
2231 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2232 typeArrayHandle method_ordering(THREAD, new_ordering);
2233 for (int index = 0; index < length; index++) {
2234 methodOop m = methodOop(methods->obj_at(index));
2235 int old_index = m->vtable_index();
2236 assert(old_index >= 0 && old_index < length, "invalid method index");
2237 method_ordering->int_at_put(index, old_index);
2238 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2239 }
2240 return method_ordering;
2241 } else {
2242 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2243 }
2244 }
2247 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2248 ClassFileStream* cfs = stream();
2249 cfs->guarantee_more(2, CHECK); // sourcefile_index
2250 u2 sourcefile_index = cfs->get_u2_fast();
2251 check_property(
2252 valid_cp_range(sourcefile_index, cp->length()) &&
2253 cp->tag_at(sourcefile_index).is_utf8(),
2254 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2255 sourcefile_index, CHECK);
2256 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2257 }
2261 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2262 instanceKlassHandle k,
2263 int length, TRAPS) {
2264 ClassFileStream* cfs = stream();
2265 u1* sde_buffer = cfs->get_u1_buffer();
2266 assert(sde_buffer != NULL, "null sde buffer");
2268 // Don't bother storing it if there is no way to retrieve it
2269 if (JvmtiExport::can_get_source_debug_extension()) {
2270 // Optimistically assume that only 1 byte UTF format is used
2271 // (common case)
2272 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2273 k->set_source_debug_extension(sde_symbol);
2274 // Note that set_source_debug_extension() increments the reference count
2275 // for its copy of the Symbol*, so use a TempNewSymbol here.
2276 }
2277 // Got utf8 string, set stream position forward
2278 cfs->skip_u1(length, CHECK);
2279 }
2282 // Inner classes can be static, private or protected (classic VM does this)
2283 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2285 // Return number of classes in the inner classes attribute table
2286 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2287 ClassFileStream* cfs = stream();
2288 cfs->guarantee_more(2, CHECK_0); // length
2289 u2 length = cfs->get_u2_fast();
2291 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2292 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2293 typeArrayHandle inner_classes(THREAD, ic);
2294 int index = 0;
2295 int cp_size = cp->length();
2296 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2297 for (int n = 0; n < length; n++) {
2298 // Inner class index
2299 u2 inner_class_info_index = cfs->get_u2_fast();
2300 check_property(
2301 inner_class_info_index == 0 ||
2302 (valid_cp_range(inner_class_info_index, cp_size) &&
2303 is_klass_reference(cp, inner_class_info_index)),
2304 "inner_class_info_index %u has bad constant type in class file %s",
2305 inner_class_info_index, CHECK_0);
2306 // Outer class index
2307 u2 outer_class_info_index = cfs->get_u2_fast();
2308 check_property(
2309 outer_class_info_index == 0 ||
2310 (valid_cp_range(outer_class_info_index, cp_size) &&
2311 is_klass_reference(cp, outer_class_info_index)),
2312 "outer_class_info_index %u has bad constant type in class file %s",
2313 outer_class_info_index, CHECK_0);
2314 // Inner class name
2315 u2 inner_name_index = cfs->get_u2_fast();
2316 check_property(
2317 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2318 cp->tag_at(inner_name_index).is_utf8()),
2319 "inner_name_index %u has bad constant type in class file %s",
2320 inner_name_index, CHECK_0);
2321 if (_need_verify) {
2322 guarantee_property(inner_class_info_index != outer_class_info_index,
2323 "Class is both outer and inner class in class file %s", CHECK_0);
2324 }
2325 // Access flags
2326 AccessFlags inner_access_flags;
2327 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2328 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2329 // Set abstract bit for old class files for backward compatibility
2330 flags |= JVM_ACC_ABSTRACT;
2331 }
2332 verify_legal_class_modifiers(flags, CHECK_0);
2333 inner_access_flags.set_flags(flags);
2335 inner_classes->short_at_put(index++, inner_class_info_index);
2336 inner_classes->short_at_put(index++, outer_class_info_index);
2337 inner_classes->short_at_put(index++, inner_name_index);
2338 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2339 }
2341 // 4347400: make sure there's no duplicate entry in the classes array
2342 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2343 for(int i = 0; i < inner_classes->length(); i += 4) {
2344 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2345 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2346 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2347 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2348 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2349 "Duplicate entry in InnerClasses in class file %s",
2350 CHECK_0);
2351 }
2352 }
2353 }
2355 // Update instanceKlass with inner class info.
2356 k->set_inner_classes(inner_classes());
2357 return length;
2358 }
2360 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2361 k->set_is_synthetic();
2362 }
2364 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2365 ClassFileStream* cfs = stream();
2366 u2 signature_index = cfs->get_u2(CHECK);
2367 check_property(
2368 valid_cp_range(signature_index, cp->length()) &&
2369 cp->tag_at(signature_index).is_utf8(),
2370 "Invalid constant pool index %u in Signature attribute in class file %s",
2371 signature_index, CHECK);
2372 k->set_generic_signature(cp->symbol_at(signature_index));
2373 }
2375 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2376 u4 attribute_byte_length, TRAPS) {
2377 ClassFileStream* cfs = stream();
2378 u1* current_start = cfs->current();
2380 cfs->guarantee_more(2, CHECK); // length
2381 int attribute_array_length = cfs->get_u2_fast();
2383 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2384 "Short length on BootstrapMethods in class file %s",
2385 CHECK);
2387 // The attribute contains a counted array of counted tuples of shorts,
2388 // represending bootstrap specifiers:
2389 // length*{bootstrap_method_index, argument_count*{argument_index}}
2390 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2391 // operand_count = number of shorts in attr, except for leading length
2393 // The attribute is copied into a short[] array.
2394 // The array begins with a series of short[2] pairs, one for each tuple.
2395 int index_size = (attribute_array_length * 2);
2397 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2398 typeArrayHandle operands(THREAD, operands_oop);
2399 operands_oop = NULL; // tidy
2401 int operand_fill_index = index_size;
2402 int cp_size = cp->length();
2404 for (int n = 0; n < attribute_array_length; n++) {
2405 // Store a 32-bit offset into the header of the operand array.
2406 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2407 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2409 // Read a bootstrap specifier.
2410 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2411 u2 bootstrap_method_index = cfs->get_u2_fast();
2412 u2 argument_count = cfs->get_u2_fast();
2413 check_property(
2414 valid_cp_range(bootstrap_method_index, cp_size) &&
2415 cp->tag_at(bootstrap_method_index).is_method_handle(),
2416 "bootstrap_method_index %u has bad constant type in class file %s",
2417 bootstrap_method_index,
2418 CHECK);
2419 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2420 operands->short_at_put(operand_fill_index++, argument_count);
2422 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2423 for (int j = 0; j < argument_count; j++) {
2424 u2 argument_index = cfs->get_u2_fast();
2425 check_property(
2426 valid_cp_range(argument_index, cp_size) &&
2427 cp->tag_at(argument_index).is_loadable_constant(),
2428 "argument_index %u has bad constant type in class file %s",
2429 argument_index,
2430 CHECK);
2431 operands->short_at_put(operand_fill_index++, argument_index);
2432 }
2433 }
2435 assert(operand_fill_index == operands()->length(), "exact fill");
2436 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2438 u1* current_end = cfs->current();
2439 guarantee_property(current_end == current_start + attribute_byte_length,
2440 "Bad length on BootstrapMethods in class file %s",
2441 CHECK);
2443 cp->set_operands(operands());
2444 }
2447 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2448 ClassFileStream* cfs = stream();
2449 // Set inner classes attribute to default sentinel
2450 k->set_inner_classes(Universe::the_empty_short_array());
2451 cfs->guarantee_more(2, CHECK); // attributes_count
2452 u2 attributes_count = cfs->get_u2_fast();
2453 bool parsed_sourcefile_attribute = false;
2454 bool parsed_innerclasses_attribute = false;
2455 bool parsed_enclosingmethod_attribute = false;
2456 bool parsed_bootstrap_methods_attribute = false;
2457 u1* runtime_visible_annotations = NULL;
2458 int runtime_visible_annotations_length = 0;
2459 u1* runtime_invisible_annotations = NULL;
2460 int runtime_invisible_annotations_length = 0;
2461 // Iterate over attributes
2462 while (attributes_count--) {
2463 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2464 u2 attribute_name_index = cfs->get_u2_fast();
2465 u4 attribute_length = cfs->get_u4_fast();
2466 check_property(
2467 valid_cp_range(attribute_name_index, cp->length()) &&
2468 cp->tag_at(attribute_name_index).is_utf8(),
2469 "Attribute name has bad constant pool index %u in class file %s",
2470 attribute_name_index, CHECK);
2471 Symbol* tag = cp->symbol_at(attribute_name_index);
2472 if (tag == vmSymbols::tag_source_file()) {
2473 // Check for SourceFile tag
2474 if (_need_verify) {
2475 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2476 }
2477 if (parsed_sourcefile_attribute) {
2478 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2479 } else {
2480 parsed_sourcefile_attribute = true;
2481 }
2482 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2483 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2484 // Check for SourceDebugExtension tag
2485 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2486 } else if (tag == vmSymbols::tag_inner_classes()) {
2487 // Check for InnerClasses tag
2488 if (parsed_innerclasses_attribute) {
2489 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2490 } else {
2491 parsed_innerclasses_attribute = true;
2492 }
2493 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2494 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2495 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2496 "Wrong InnerClasses attribute length in class file %s", CHECK);
2497 }
2498 } else if (tag == vmSymbols::tag_synthetic()) {
2499 // Check for Synthetic tag
2500 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2501 if (attribute_length != 0) {
2502 classfile_parse_error(
2503 "Invalid Synthetic classfile attribute length %u in class file %s",
2504 attribute_length, CHECK);
2505 }
2506 parse_classfile_synthetic_attribute(cp, k, CHECK);
2507 } else if (tag == vmSymbols::tag_deprecated()) {
2508 // Check for Deprecatd tag - 4276120
2509 if (attribute_length != 0) {
2510 classfile_parse_error(
2511 "Invalid Deprecated classfile attribute length %u in class file %s",
2512 attribute_length, CHECK);
2513 }
2514 } else if (_major_version >= JAVA_1_5_VERSION) {
2515 if (tag == vmSymbols::tag_signature()) {
2516 if (attribute_length != 2) {
2517 classfile_parse_error(
2518 "Wrong Signature attribute length %u in class file %s",
2519 attribute_length, CHECK);
2520 }
2521 parse_classfile_signature_attribute(cp, k, CHECK);
2522 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2523 runtime_visible_annotations_length = attribute_length;
2524 runtime_visible_annotations = cfs->get_u1_buffer();
2525 assert(runtime_visible_annotations != NULL, "null visible annotations");
2526 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2527 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2528 runtime_invisible_annotations_length = attribute_length;
2529 runtime_invisible_annotations = cfs->get_u1_buffer();
2530 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2531 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2532 } else if (tag == vmSymbols::tag_enclosing_method()) {
2533 if (parsed_enclosingmethod_attribute) {
2534 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2535 } else {
2536 parsed_enclosingmethod_attribute = true;
2537 }
2538 cfs->guarantee_more(4, CHECK); // class_index, method_index
2539 u2 class_index = cfs->get_u2_fast();
2540 u2 method_index = cfs->get_u2_fast();
2541 if (class_index == 0) {
2542 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2543 }
2544 // Validate the constant pool indices and types
2545 if (!cp->is_within_bounds(class_index) ||
2546 !is_klass_reference(cp, class_index)) {
2547 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2548 }
2549 if (method_index != 0 &&
2550 (!cp->is_within_bounds(method_index) ||
2551 !cp->tag_at(method_index).is_name_and_type())) {
2552 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2553 }
2554 k->set_enclosing_method_indices(class_index, method_index);
2555 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2556 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2557 if (parsed_bootstrap_methods_attribute)
2558 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2559 parsed_bootstrap_methods_attribute = true;
2560 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2561 } else {
2562 // Unknown attribute
2563 cfs->skip_u1(attribute_length, CHECK);
2564 }
2565 } else {
2566 // Unknown attribute
2567 cfs->skip_u1(attribute_length, CHECK);
2568 }
2569 }
2570 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2571 runtime_visible_annotations_length,
2572 runtime_invisible_annotations,
2573 runtime_invisible_annotations_length,
2574 CHECK);
2575 k->set_class_annotations(annotations());
2577 if (_max_bootstrap_specifier_index >= 0) {
2578 guarantee_property(parsed_bootstrap_methods_attribute,
2579 "Missing BootstrapMethods attribute in class file %s", CHECK);
2580 }
2581 }
2584 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2585 int runtime_visible_annotations_length,
2586 u1* runtime_invisible_annotations,
2587 int runtime_invisible_annotations_length, TRAPS) {
2588 typeArrayHandle annotations;
2589 if (runtime_visible_annotations != NULL ||
2590 runtime_invisible_annotations != NULL) {
2591 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2592 runtime_invisible_annotations_length, CHECK_(annotations));
2593 annotations = typeArrayHandle(THREAD, anno);
2594 if (runtime_visible_annotations != NULL) {
2595 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2596 }
2597 if (runtime_invisible_annotations != NULL) {
2598 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2599 }
2600 }
2601 return annotations;
2602 }
2605 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2606 KlassHandle h_k (THREAD, fd->field_holder());
2607 assert(h_k.not_null() && fd->is_static(), "just checking");
2608 if (fd->has_initial_value()) {
2609 BasicType t = fd->field_type();
2610 switch (t) {
2611 case T_BYTE:
2612 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2613 break;
2614 case T_BOOLEAN:
2615 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2616 break;
2617 case T_CHAR:
2618 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2619 break;
2620 case T_SHORT:
2621 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2622 break;
2623 case T_INT:
2624 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2625 break;
2626 case T_FLOAT:
2627 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2628 break;
2629 case T_DOUBLE:
2630 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2631 break;
2632 case T_LONG:
2633 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2634 break;
2635 case T_OBJECT:
2636 {
2637 #ifdef ASSERT
2638 TempNewSymbol sym = SymbolTable::new_symbol("Ljava/lang/String;", CHECK);
2639 assert(fd->signature() == sym, "just checking");
2640 #endif
2641 oop string = fd->string_initial_value(CHECK);
2642 h_k()->obj_field_put(fd->offset(), string);
2643 }
2644 break;
2645 default:
2646 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2647 "Illegal ConstantValue attribute in class file");
2648 }
2649 }
2650 }
2653 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2654 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2655 // This code is for compatibility with earlier jdk's that do not
2656 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2657 // the check for the "discovered" field should issue a warning if
2658 // the field is not found. For 1.6 this code should be issue a
2659 // fatal error if the "discovered" field is not found.
2660 //
2661 // Increment fac.nonstatic_oop_count so that the start of the
2662 // next type of non-static oops leaves room for the fake oop.
2663 // Do not increment next_nonstatic_oop_offset so that the
2664 // fake oop is place after the java.lang.ref.Reference oop
2665 // fields.
2666 //
2667 // Check the fields in java.lang.ref.Reference for the "discovered"
2668 // field. If it is not present, artifically create a field for it.
2669 // This allows this VM to run on early JDK where the field is not
2670 // present.
2671 int reference_sig_index = 0;
2672 int reference_name_index = 0;
2673 int reference_index = 0;
2674 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2675 const int n = (*fields_ptr)()->length();
2676 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2677 int name_index =
2678 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2679 int sig_index =
2680 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2681 Symbol* f_name = cp->symbol_at(name_index);
2682 Symbol* f_sig = cp->symbol_at(sig_index);
2683 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2684 // Save the index for reference signature for later use.
2685 // The fake discovered field does not entries in the
2686 // constant pool so the index for its signature cannot
2687 // be extracted from the constant pool. It will need
2688 // later, however. It's signature is vmSymbols::reference_signature()
2689 // so same an index for that signature.
2690 reference_sig_index = sig_index;
2691 reference_name_index = name_index;
2692 reference_index = i;
2693 }
2694 if (f_name == vmSymbols::reference_discovered_name() &&
2695 f_sig == vmSymbols::reference_signature()) {
2696 // The values below are fake but will force extra
2697 // non-static oop fields and a corresponding non-static
2698 // oop map block to be allocated.
2699 extra = 0;
2700 break;
2701 }
2702 }
2703 if (extra != 0) {
2704 fac_ptr->nonstatic_oop_count += extra;
2705 // Add the additional entry to "fields" so that the klass
2706 // contains the "discoverd" field and the field will be initialized
2707 // in instances of the object.
2708 int fields_with_fix_length = (*fields_ptr)()->length() +
2709 instanceKlass::next_offset;
2710 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2711 fields_with_fix_length, CHECK);
2712 typeArrayHandle fields_with_fix(THREAD, ff);
2714 // Take everything from the original but the length.
2715 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2716 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2717 }
2719 // Add the fake field at the end.
2720 int i = (*fields_ptr)->length();
2721 // There is no name index for the fake "discovered" field nor
2722 // signature but a signature is needed so that the field will
2723 // be properly initialized. Use one found for
2724 // one of the other reference fields. Be sure the index for the
2725 // name is 0. In fieldDescriptor::initialize() the index of the
2726 // name is checked. That check is by passed for the last nonstatic
2727 // oop field in a java.lang.ref.Reference which is assumed to be
2728 // this artificial "discovered" field. An assertion checks that
2729 // the name index is 0.
2730 assert(reference_index != 0, "Missing signature for reference");
2732 int j;
2733 for (j = 0; j < instanceKlass::next_offset; j++) {
2734 fields_with_fix->ushort_at_put(i + j,
2735 (*fields_ptr)->ushort_at(reference_index +j));
2736 }
2737 // Clear the public access flag and set the private access flag.
2738 short flags;
2739 flags =
2740 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2741 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2742 flags = flags & (~JVM_ACC_PUBLIC);
2743 flags = flags | JVM_ACC_PRIVATE;
2744 AccessFlags access_flags;
2745 access_flags.set_flags(flags);
2746 assert(!access_flags.is_public(), "Failed to clear public flag");
2747 assert(access_flags.is_private(), "Failed to set private flag");
2748 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2749 flags);
2751 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2752 == reference_name_index, "The fake reference name is incorrect");
2753 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2754 == reference_sig_index, "The fake reference signature is incorrect");
2755 // The type of the field is stored in the low_offset entry during
2756 // parsing.
2757 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2758 NONSTATIC_OOP, "The fake reference type is incorrect");
2760 // "fields" is allocated in the permanent generation. Disgard
2761 // it and let it be collected.
2762 (*fields_ptr) = fields_with_fix;
2763 }
2764 return;
2765 }
2768 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2769 FieldAllocationCount *fac_ptr, TRAPS) {
2770 // Add fake fields for java.lang.Class instances
2771 //
2772 // This is not particularly nice. We should consider adding a
2773 // private transient object field at the Java level to
2774 // java.lang.Class. Alternatively we could add a subclass of
2775 // instanceKlass which provides an accessor and size computer for
2776 // this field, but that appears to be more code than this hack.
2777 //
2778 // NOTE that we wedge these in at the beginning rather than the
2779 // end of the object because the Class layout changed between JDK
2780 // 1.3 and JDK 1.4 with the new reflection implementation; some
2781 // nonstatic oop fields were added at the Java level. The offsets
2782 // of these fake fields can't change between these two JDK
2783 // versions because when the offsets are computed at bootstrap
2784 // time we don't know yet which version of the JDK we're running in.
2786 // The values below are fake but will force two non-static oop fields and
2787 // a corresponding non-static oop map block to be allocated.
2788 const int extra = java_lang_Class::number_of_fake_oop_fields;
2789 fac_ptr->nonstatic_oop_count += extra;
2790 }
2793 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2794 // Cause the extra fake fields in java.lang.Class to show up before
2795 // the Java fields for layout compatibility between 1.3 and 1.4
2796 // Incrementing next_nonstatic_oop_offset here advances the
2797 // location where the real java fields are placed.
2798 const int extra = java_lang_Class::number_of_fake_oop_fields;
2799 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2800 }
2803 // Force MethodHandle.vmentry to be an unmanaged pointer.
2804 // There is no way for a classfile to express this, so we must help it.
2805 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2806 typeArrayHandle fields,
2807 FieldAllocationCount *fac_ptr,
2808 TRAPS) {
2809 // Add fake fields for java.dyn.MethodHandle instances
2810 //
2811 // This is not particularly nice, but since there is no way to express
2812 // a native wordSize field in Java, we must do it at this level.
2814 if (!EnableMethodHandles) return;
2816 int word_sig_index = 0;
2817 const int cp_size = cp->length();
2818 for (int index = 1; index < cp_size; index++) {
2819 if (cp->tag_at(index).is_utf8() &&
2820 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2821 word_sig_index = index;
2822 break;
2823 }
2824 }
2826 if (word_sig_index == 0)
2827 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2828 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2830 // Find vmentry field and change the signature.
2831 bool found_vmentry = false;
2832 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) {
2833 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
2834 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
2835 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset);
2836 Symbol* f_name = cp->symbol_at(name_index);
2837 Symbol* f_sig = cp->symbol_at(sig_index);
2838 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) {
2839 if (f_sig == vmSymbols::machine_word_signature()) {
2840 // If the signature of vmentry is already changed, we're done.
2841 found_vmentry = true;
2842 break;
2843 }
2844 else if (f_sig == vmSymbols::byte_signature()) {
2845 // Adjust the field type from byte to an unmanaged pointer.
2846 assert(fac_ptr->nonstatic_byte_count > 0, "");
2847 fac_ptr->nonstatic_byte_count -= 1;
2849 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2850 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2851 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2852 else fac_ptr->nonstatic_word_count += 1;
2854 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
2855 assert(atype == NONSTATIC_BYTE, "");
2856 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2857 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2859 found_vmentry = true;
2860 break;
2861 }
2862 }
2863 }
2865 if (!found_vmentry)
2866 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2867 "missing vmentry byte field in java.dyn.MethodHandle");
2868 }
2871 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2872 Handle class_loader,
2873 Handle protection_domain,
2874 KlassHandle host_klass,
2875 GrowableArray<Handle>* cp_patches,
2876 TempNewSymbol& parsed_name,
2877 bool verify,
2878 TRAPS) {
2879 // So that JVMTI can cache class file in the state before retransformable agents
2880 // have modified it
2881 unsigned char *cached_class_file_bytes = NULL;
2882 jint cached_class_file_length;
2884 ClassFileStream* cfs = stream();
2885 // Timing
2886 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2887 JavaThread* jt = (JavaThread*) THREAD;
2889 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2890 ClassLoader::perf_class_parse_selftime(),
2891 NULL,
2892 jt->get_thread_stat()->perf_recursion_counts_addr(),
2893 jt->get_thread_stat()->perf_timers_addr(),
2894 PerfClassTraceTime::PARSE_CLASS);
2896 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2897 _max_bootstrap_specifier_index = -1;
2899 if (JvmtiExport::should_post_class_file_load_hook()) {
2900 unsigned char* ptr = cfs->buffer();
2901 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2903 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2904 &ptr, &end_ptr,
2905 &cached_class_file_bytes,
2906 &cached_class_file_length);
2908 if (ptr != cfs->buffer()) {
2909 // JVMTI agent has modified class file data.
2910 // Set new class file stream using JVMTI agent modified
2911 // class file data.
2912 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2913 set_stream(cfs);
2914 }
2915 }
2917 _host_klass = host_klass;
2918 _cp_patches = cp_patches;
2920 instanceKlassHandle nullHandle;
2922 // Figure out whether we can skip format checking (matching classic VM behavior)
2923 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2925 // Set the verify flag in stream
2926 cfs->set_verify(_need_verify);
2928 // Save the class file name for easier error message printing.
2929 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2931 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2932 // Magic value
2933 u4 magic = cfs->get_u4_fast();
2934 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2935 "Incompatible magic value %u in class file %s",
2936 magic, CHECK_(nullHandle));
2938 // Version numbers
2939 u2 minor_version = cfs->get_u2_fast();
2940 u2 major_version = cfs->get_u2_fast();
2942 // Check version numbers - we check this even with verifier off
2943 if (!is_supported_version(major_version, minor_version)) {
2944 if (name == NULL) {
2945 Exceptions::fthrow(
2946 THREAD_AND_LOCATION,
2947 vmSymbols::java_lang_UnsupportedClassVersionError(),
2948 "Unsupported major.minor version %u.%u",
2949 major_version,
2950 minor_version);
2951 } else {
2952 ResourceMark rm(THREAD);
2953 Exceptions::fthrow(
2954 THREAD_AND_LOCATION,
2955 vmSymbols::java_lang_UnsupportedClassVersionError(),
2956 "%s : Unsupported major.minor version %u.%u",
2957 name->as_C_string(),
2958 major_version,
2959 minor_version);
2960 }
2961 return nullHandle;
2962 }
2964 _major_version = major_version;
2965 _minor_version = minor_version;
2968 // Check if verification needs to be relaxed for this class file
2969 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2970 _relax_verify = Verifier::relax_verify_for(class_loader());
2972 // Constant pool
2973 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2974 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2976 int cp_size = cp->length();
2978 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2980 // Access flags
2981 AccessFlags access_flags;
2982 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2984 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2985 // Set abstract bit for old class files for backward compatibility
2986 flags |= JVM_ACC_ABSTRACT;
2987 }
2988 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2989 access_flags.set_flags(flags);
2991 // This class and superclass
2992 instanceKlassHandle super_klass;
2993 u2 this_class_index = cfs->get_u2_fast();
2994 check_property(
2995 valid_cp_range(this_class_index, cp_size) &&
2996 cp->tag_at(this_class_index).is_unresolved_klass(),
2997 "Invalid this class index %u in constant pool in class file %s",
2998 this_class_index, CHECK_(nullHandle));
3000 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3001 assert(class_name != NULL, "class_name can't be null");
3003 // It's important to set parsed_name *before* resolving the super class.
3004 // (it's used for cleanup by the caller if parsing fails)
3005 parsed_name = class_name;
3006 // parsed_name is returned and can be used if there's an error, so add to
3007 // its reference count. Caller will decrement the refcount.
3008 parsed_name->increment_refcount();
3010 // Update _class_name which could be null previously to be class_name
3011 _class_name = class_name;
3013 // Don't need to check whether this class name is legal or not.
3014 // It has been checked when constant pool is parsed.
3015 // However, make sure it is not an array type.
3016 if (_need_verify) {
3017 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3018 "Bad class name in class file %s",
3019 CHECK_(nullHandle));
3020 }
3022 klassOop preserve_this_klass; // for storing result across HandleMark
3024 // release all handles when parsing is done
3025 { HandleMark hm(THREAD);
3027 // Checks if name in class file matches requested name
3028 if (name != NULL && class_name != name) {
3029 ResourceMark rm(THREAD);
3030 Exceptions::fthrow(
3031 THREAD_AND_LOCATION,
3032 vmSymbols::java_lang_NoClassDefFoundError(),
3033 "%s (wrong name: %s)",
3034 name->as_C_string(),
3035 class_name->as_C_string()
3036 );
3037 return nullHandle;
3038 }
3040 if (TraceClassLoadingPreorder) {
3041 tty->print("[Loading %s", name->as_klass_external_name());
3042 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3043 tty->print_cr("]");
3044 }
3046 u2 super_class_index = cfs->get_u2_fast();
3047 if (super_class_index == 0) {
3048 check_property(class_name == vmSymbols::java_lang_Object(),
3049 "Invalid superclass index %u in class file %s",
3050 super_class_index,
3051 CHECK_(nullHandle));
3052 } else {
3053 check_property(valid_cp_range(super_class_index, cp_size) &&
3054 is_klass_reference(cp, super_class_index),
3055 "Invalid superclass index %u in class file %s",
3056 super_class_index,
3057 CHECK_(nullHandle));
3058 // The class name should be legal because it is checked when parsing constant pool.
3059 // However, make sure it is not an array type.
3060 bool is_array = false;
3061 if (cp->tag_at(super_class_index).is_klass()) {
3062 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3063 if (_need_verify)
3064 is_array = super_klass->oop_is_array();
3065 } else if (_need_verify) {
3066 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3067 }
3068 if (_need_verify) {
3069 guarantee_property(!is_array,
3070 "Bad superclass name in class file %s", CHECK_(nullHandle));
3071 }
3072 }
3074 // Interfaces
3075 u2 itfs_len = cfs->get_u2_fast();
3076 objArrayHandle local_interfaces;
3077 if (itfs_len == 0) {
3078 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3079 } else {
3080 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3081 }
3083 // Fields (offsets are filled in later)
3084 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
3085 objArrayHandle fields_annotations;
3086 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
3087 // Methods
3088 bool has_final_method = false;
3089 AccessFlags promoted_flags;
3090 promoted_flags.set_flags(0);
3091 // These need to be oop pointers because they are allocated lazily
3092 // inside parse_methods inside a nested HandleMark
3093 objArrayOop methods_annotations_oop = NULL;
3094 objArrayOop methods_parameter_annotations_oop = NULL;
3095 objArrayOop methods_default_annotations_oop = NULL;
3096 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3097 &promoted_flags,
3098 &has_final_method,
3099 &methods_annotations_oop,
3100 &methods_parameter_annotations_oop,
3101 &methods_default_annotations_oop,
3102 CHECK_(nullHandle));
3104 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3105 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3106 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3108 // We check super class after class file is parsed and format is checked
3109 if (super_class_index > 0 && super_klass.is_null()) {
3110 Symbol* sk = cp->klass_name_at(super_class_index);
3111 if (access_flags.is_interface()) {
3112 // Before attempting to resolve the superclass, check for class format
3113 // errors not checked yet.
3114 guarantee_property(sk == vmSymbols::java_lang_Object(),
3115 "Interfaces must have java.lang.Object as superclass in class file %s",
3116 CHECK_(nullHandle));
3117 }
3118 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3119 sk,
3120 class_loader,
3121 protection_domain,
3122 true,
3123 CHECK_(nullHandle));
3125 KlassHandle kh (THREAD, k);
3126 super_klass = instanceKlassHandle(THREAD, kh());
3127 if (LinkWellKnownClasses) // my super class is well known to me
3128 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3129 }
3130 if (super_klass.not_null()) {
3131 if (super_klass->is_interface()) {
3132 ResourceMark rm(THREAD);
3133 Exceptions::fthrow(
3134 THREAD_AND_LOCATION,
3135 vmSymbols::java_lang_IncompatibleClassChangeError(),
3136 "class %s has interface %s as super class",
3137 class_name->as_klass_external_name(),
3138 super_klass->external_name()
3139 );
3140 return nullHandle;
3141 }
3142 // Make sure super class is not final
3143 if (super_klass->is_final()) {
3144 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3145 }
3146 }
3148 // Compute the transitive list of all unique interfaces implemented by this class
3149 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3151 // sort methods
3152 typeArrayHandle method_ordering = sort_methods(methods,
3153 methods_annotations,
3154 methods_parameter_annotations,
3155 methods_default_annotations,
3156 CHECK_(nullHandle));
3158 // promote flags from parse_methods() to the klass' flags
3159 access_flags.add_promoted_flags(promoted_flags.as_int());
3161 // Size of Java vtable (in words)
3162 int vtable_size = 0;
3163 int itable_size = 0;
3164 int num_miranda_methods = 0;
3166 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3167 num_miranda_methods,
3168 super_klass(),
3169 methods(),
3170 access_flags,
3171 class_loader,
3172 class_name,
3173 local_interfaces(),
3174 CHECK_(nullHandle));
3176 // Size of Java itable (in words)
3177 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3179 // Field size and offset computation
3180 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3181 #ifndef PRODUCT
3182 int orig_nonstatic_field_size = 0;
3183 #endif
3184 int static_field_size = 0;
3185 int next_static_oop_offset;
3186 int next_static_double_offset;
3187 int next_static_word_offset;
3188 int next_static_short_offset;
3189 int next_static_byte_offset;
3190 int next_static_type_offset;
3191 int next_nonstatic_oop_offset;
3192 int next_nonstatic_double_offset;
3193 int next_nonstatic_word_offset;
3194 int next_nonstatic_short_offset;
3195 int next_nonstatic_byte_offset;
3196 int next_nonstatic_type_offset;
3197 int first_nonstatic_oop_offset;
3198 int first_nonstatic_field_offset;
3199 int next_nonstatic_field_offset;
3201 // Calculate the starting byte offsets
3202 next_static_oop_offset = (instanceKlass::header_size() +
3203 align_object_offset(vtable_size) +
3204 align_object_offset(itable_size)) * wordSize;
3205 next_static_double_offset = next_static_oop_offset +
3206 (fac.static_oop_count * heapOopSize);
3207 if ( fac.static_double_count &&
3208 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3209 Universe::field_type_should_be_aligned(T_LONG)) ) {
3210 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3211 }
3213 next_static_word_offset = next_static_double_offset +
3214 (fac.static_double_count * BytesPerLong);
3215 next_static_short_offset = next_static_word_offset +
3216 (fac.static_word_count * BytesPerInt);
3217 next_static_byte_offset = next_static_short_offset +
3218 (fac.static_short_count * BytesPerShort);
3219 next_static_type_offset = align_size_up((next_static_byte_offset +
3220 fac.static_byte_count ), wordSize );
3221 static_field_size = (next_static_type_offset -
3222 next_static_oop_offset) / wordSize;
3223 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3224 nonstatic_field_size * heapOopSize;
3225 next_nonstatic_field_offset = first_nonstatic_field_offset;
3227 // Add fake fields for java.lang.Class instances (also see below)
3228 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3229 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3230 }
3232 // adjust the vmentry field declaration in java.dyn.MethodHandle
3233 if (EnableMethodHandles && class_name == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3234 java_dyn_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3235 }
3237 // Add a fake "discovered" field if it is not present
3238 // for compatibility with earlier jdk's.
3239 if (class_name == vmSymbols::java_lang_ref_Reference()
3240 && class_loader.is_null()) {
3241 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3242 }
3243 // end of "discovered" field compactibility fix
3245 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3246 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3247 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3248 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3249 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3251 bool super_has_nonstatic_fields =
3252 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3253 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3254 ((nonstatic_double_count + nonstatic_word_count +
3255 nonstatic_short_count + nonstatic_byte_count +
3256 nonstatic_oop_count) != 0);
3259 // Prepare list of oops for oop map generation.
3260 int* nonstatic_oop_offsets;
3261 unsigned int* nonstatic_oop_counts;
3262 unsigned int nonstatic_oop_map_count = 0;
3264 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3265 THREAD, int, nonstatic_oop_count + 1);
3266 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3267 THREAD, unsigned int, nonstatic_oop_count + 1);
3269 // Add fake fields for java.lang.Class instances (also see above).
3270 // FieldsAllocationStyle and CompactFields values will be reset to default.
3271 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3272 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3273 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3274 const uint fake_oop_count = (next_nonstatic_field_offset -
3275 first_nonstatic_field_offset) / heapOopSize;
3276 nonstatic_oop_counts[0] = fake_oop_count;
3277 nonstatic_oop_map_count = 1;
3278 nonstatic_oop_count -= fake_oop_count;
3279 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3280 } else {
3281 first_nonstatic_oop_offset = 0; // will be set for first oop field
3282 }
3284 #ifndef PRODUCT
3285 if( PrintCompactFieldsSavings ) {
3286 next_nonstatic_double_offset = next_nonstatic_field_offset +
3287 (nonstatic_oop_count * heapOopSize);
3288 if ( nonstatic_double_count > 0 ) {
3289 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3290 }
3291 next_nonstatic_word_offset = next_nonstatic_double_offset +
3292 (nonstatic_double_count * BytesPerLong);
3293 next_nonstatic_short_offset = next_nonstatic_word_offset +
3294 (nonstatic_word_count * BytesPerInt);
3295 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3296 (nonstatic_short_count * BytesPerShort);
3297 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3298 nonstatic_byte_count ), heapOopSize );
3299 orig_nonstatic_field_size = nonstatic_field_size +
3300 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3301 }
3302 #endif
3303 bool compact_fields = CompactFields;
3304 int allocation_style = FieldsAllocationStyle;
3305 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3306 assert(false, "0 <= FieldsAllocationStyle <= 2");
3307 allocation_style = 1; // Optimistic
3308 }
3310 // The next classes have predefined hard-coded fields offsets
3311 // (see in JavaClasses::compute_hard_coded_offsets()).
3312 // Use default fields allocation order for them.
3313 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3314 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3315 class_name == vmSymbols::java_lang_Class() ||
3316 class_name == vmSymbols::java_lang_ClassLoader() ||
3317 class_name == vmSymbols::java_lang_ref_Reference() ||
3318 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3319 class_name == vmSymbols::java_lang_StackTraceElement() ||
3320 class_name == vmSymbols::java_lang_String() ||
3321 class_name == vmSymbols::java_lang_Throwable() ||
3322 class_name == vmSymbols::java_lang_Boolean() ||
3323 class_name == vmSymbols::java_lang_Character() ||
3324 class_name == vmSymbols::java_lang_Float() ||
3325 class_name == vmSymbols::java_lang_Double() ||
3326 class_name == vmSymbols::java_lang_Byte() ||
3327 class_name == vmSymbols::java_lang_Short() ||
3328 class_name == vmSymbols::java_lang_Integer() ||
3329 class_name == vmSymbols::java_lang_Long())) {
3330 allocation_style = 0; // Allocate oops first
3331 compact_fields = false; // Don't compact fields
3332 }
3334 if( allocation_style == 0 ) {
3335 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3336 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3337 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3338 (nonstatic_oop_count * heapOopSize);
3339 } else if( allocation_style == 1 ) {
3340 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3341 next_nonstatic_double_offset = next_nonstatic_field_offset;
3342 } else if( allocation_style == 2 ) {
3343 // Fields allocation: oops fields in super and sub classes are together.
3344 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3345 super_klass->nonstatic_oop_map_size() > 0 ) {
3346 int map_size = super_klass->nonstatic_oop_map_size();
3347 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3348 OopMapBlock* last_map = first_map + map_size - 1;
3349 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3350 if (next_offset == next_nonstatic_field_offset) {
3351 allocation_style = 0; // allocate oops first
3352 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3353 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3354 (nonstatic_oop_count * heapOopSize);
3355 }
3356 }
3357 if( allocation_style == 2 ) {
3358 allocation_style = 1; // allocate oops last
3359 next_nonstatic_double_offset = next_nonstatic_field_offset;
3360 }
3361 } else {
3362 ShouldNotReachHere();
3363 }
3365 int nonstatic_oop_space_count = 0;
3366 int nonstatic_word_space_count = 0;
3367 int nonstatic_short_space_count = 0;
3368 int nonstatic_byte_space_count = 0;
3369 int nonstatic_oop_space_offset;
3370 int nonstatic_word_space_offset;
3371 int nonstatic_short_space_offset;
3372 int nonstatic_byte_space_offset;
3374 if( nonstatic_double_count > 0 ) {
3375 int offset = next_nonstatic_double_offset;
3376 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3377 if( compact_fields && offset != next_nonstatic_double_offset ) {
3378 // Allocate available fields into the gap before double field.
3379 int length = next_nonstatic_double_offset - offset;
3380 assert(length == BytesPerInt, "");
3381 nonstatic_word_space_offset = offset;
3382 if( nonstatic_word_count > 0 ) {
3383 nonstatic_word_count -= 1;
3384 nonstatic_word_space_count = 1; // Only one will fit
3385 length -= BytesPerInt;
3386 offset += BytesPerInt;
3387 }
3388 nonstatic_short_space_offset = offset;
3389 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3390 nonstatic_short_count -= 1;
3391 nonstatic_short_space_count += 1;
3392 length -= BytesPerShort;
3393 offset += BytesPerShort;
3394 }
3395 nonstatic_byte_space_offset = offset;
3396 while( length > 0 && nonstatic_byte_count > 0 ) {
3397 nonstatic_byte_count -= 1;
3398 nonstatic_byte_space_count += 1;
3399 length -= 1;
3400 }
3401 // Allocate oop field in the gap if there are no other fields for that.
3402 nonstatic_oop_space_offset = offset;
3403 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3404 allocation_style != 0 ) { // when oop fields not first
3405 nonstatic_oop_count -= 1;
3406 nonstatic_oop_space_count = 1; // Only one will fit
3407 length -= heapOopSize;
3408 offset += heapOopSize;
3409 }
3410 }
3411 }
3413 next_nonstatic_word_offset = next_nonstatic_double_offset +
3414 (nonstatic_double_count * BytesPerLong);
3415 next_nonstatic_short_offset = next_nonstatic_word_offset +
3416 (nonstatic_word_count * BytesPerInt);
3417 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3418 (nonstatic_short_count * BytesPerShort);
3420 int notaligned_offset;
3421 if( allocation_style == 0 ) {
3422 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3423 } else { // allocation_style == 1
3424 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3425 if( nonstatic_oop_count > 0 ) {
3426 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3427 }
3428 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3429 }
3430 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3431 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3432 - first_nonstatic_field_offset)/heapOopSize);
3434 // Iterate over fields again and compute correct offsets.
3435 // The field allocation type was temporarily stored in the offset slot.
3436 // oop fields are located before non-oop fields (static and non-static).
3437 int len = fields->length();
3438 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3439 int real_offset;
3440 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3441 switch (atype) {
3442 case STATIC_OOP:
3443 real_offset = next_static_oop_offset;
3444 next_static_oop_offset += heapOopSize;
3445 break;
3446 case STATIC_BYTE:
3447 real_offset = next_static_byte_offset;
3448 next_static_byte_offset += 1;
3449 break;
3450 case STATIC_SHORT:
3451 real_offset = next_static_short_offset;
3452 next_static_short_offset += BytesPerShort;
3453 break;
3454 case STATIC_WORD:
3455 real_offset = next_static_word_offset;
3456 next_static_word_offset += BytesPerInt;
3457 break;
3458 case STATIC_ALIGNED_DOUBLE:
3459 case STATIC_DOUBLE:
3460 real_offset = next_static_double_offset;
3461 next_static_double_offset += BytesPerLong;
3462 break;
3463 case NONSTATIC_OOP:
3464 if( nonstatic_oop_space_count > 0 ) {
3465 real_offset = nonstatic_oop_space_offset;
3466 nonstatic_oop_space_offset += heapOopSize;
3467 nonstatic_oop_space_count -= 1;
3468 } else {
3469 real_offset = next_nonstatic_oop_offset;
3470 next_nonstatic_oop_offset += heapOopSize;
3471 }
3472 // Update oop maps
3473 if( nonstatic_oop_map_count > 0 &&
3474 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3475 real_offset -
3476 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3477 heapOopSize ) {
3478 // Extend current oop map
3479 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3480 } else {
3481 // Create new oop map
3482 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3483 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3484 nonstatic_oop_map_count += 1;
3485 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3486 first_nonstatic_oop_offset = real_offset;
3487 }
3488 }
3489 break;
3490 case NONSTATIC_BYTE:
3491 if( nonstatic_byte_space_count > 0 ) {
3492 real_offset = nonstatic_byte_space_offset;
3493 nonstatic_byte_space_offset += 1;
3494 nonstatic_byte_space_count -= 1;
3495 } else {
3496 real_offset = next_nonstatic_byte_offset;
3497 next_nonstatic_byte_offset += 1;
3498 }
3499 break;
3500 case NONSTATIC_SHORT:
3501 if( nonstatic_short_space_count > 0 ) {
3502 real_offset = nonstatic_short_space_offset;
3503 nonstatic_short_space_offset += BytesPerShort;
3504 nonstatic_short_space_count -= 1;
3505 } else {
3506 real_offset = next_nonstatic_short_offset;
3507 next_nonstatic_short_offset += BytesPerShort;
3508 }
3509 break;
3510 case NONSTATIC_WORD:
3511 if( nonstatic_word_space_count > 0 ) {
3512 real_offset = nonstatic_word_space_offset;
3513 nonstatic_word_space_offset += BytesPerInt;
3514 nonstatic_word_space_count -= 1;
3515 } else {
3516 real_offset = next_nonstatic_word_offset;
3517 next_nonstatic_word_offset += BytesPerInt;
3518 }
3519 break;
3520 case NONSTATIC_ALIGNED_DOUBLE:
3521 case NONSTATIC_DOUBLE:
3522 real_offset = next_nonstatic_double_offset;
3523 next_nonstatic_double_offset += BytesPerLong;
3524 break;
3525 default:
3526 ShouldNotReachHere();
3527 }
3528 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3529 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3530 }
3532 // Size of instances
3533 int instance_size;
3535 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3536 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3538 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3540 // Number of non-static oop map blocks allocated at end of klass.
3541 const unsigned int total_oop_map_count =
3542 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3543 first_nonstatic_oop_offset);
3545 // Compute reference type
3546 ReferenceType rt;
3547 if (super_klass() == NULL) {
3548 rt = REF_NONE;
3549 } else {
3550 rt = super_klass->reference_type();
3551 }
3553 // We can now create the basic klassOop for this klass
3554 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3555 static_field_size,
3556 total_oop_map_count,
3557 rt, CHECK_(nullHandle));
3558 instanceKlassHandle this_klass (THREAD, ik);
3560 assert(this_klass->static_field_size() == static_field_size, "sanity");
3561 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3562 "sanity");
3564 // Fill in information already parsed
3565 this_klass->set_access_flags(access_flags);
3566 this_klass->set_should_verify_class(verify);
3567 jint lh = Klass::instance_layout_helper(instance_size, false);
3568 this_klass->set_layout_helper(lh);
3569 assert(this_klass->oop_is_instance(), "layout is correct");
3570 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3571 // Not yet: supers are done below to support the new subtype-checking fields
3572 //this_klass->set_super(super_klass());
3573 this_klass->set_class_loader(class_loader());
3574 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3575 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3576 this_klass->set_static_oop_field_size(fac.static_oop_count);
3577 cp->set_pool_holder(this_klass());
3578 error_handler.set_in_error(false); // turn off error handler for cp
3579 this_klass->set_constants(cp());
3580 this_klass->set_local_interfaces(local_interfaces());
3581 this_klass->set_fields(fields());
3582 this_klass->set_methods(methods());
3583 if (has_final_method) {
3584 this_klass->set_has_final_method();
3585 }
3586 this_klass->set_method_ordering(method_ordering());
3587 // The instanceKlass::_methods_jmethod_ids cache and the
3588 // instanceKlass::_methods_cached_itable_indices cache are
3589 // both managed on the assumption that the initial cache
3590 // size is equal to the number of methods in the class. If
3591 // that changes, then instanceKlass::idnum_can_increment()
3592 // has to be changed accordingly.
3593 this_klass->set_initial_method_idnum(methods->length());
3594 this_klass->set_name(cp->klass_name_at(this_class_index));
3595 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3596 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3597 this_klass->set_protection_domain(protection_domain());
3598 this_klass->set_fields_annotations(fields_annotations());
3599 this_klass->set_methods_annotations(methods_annotations());
3600 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3601 this_klass->set_methods_default_annotations(methods_default_annotations());
3603 this_klass->set_minor_version(minor_version);
3604 this_klass->set_major_version(major_version);
3606 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3607 // (We used to do this lazily, but now we query it in Rewriter,
3608 // which is eagerly done for every method, so we might as well do it now,
3609 // when everything is fresh in memory.)
3610 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3611 for (int j = 0; j < methods->length(); j++) {
3612 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3613 }
3614 }
3616 if (cached_class_file_bytes != NULL) {
3617 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3618 this_klass->set_cached_class_file(cached_class_file_bytes,
3619 cached_class_file_length);
3620 }
3622 // Miranda methods
3623 if ((num_miranda_methods > 0) ||
3624 // if this class introduced new miranda methods or
3625 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3626 // super class exists and this class inherited miranda methods
3627 ) {
3628 this_klass->set_has_miranda_methods(); // then set a flag
3629 }
3631 // Additional attributes
3632 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3634 // Make sure this is the end of class file stream
3635 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3637 // Initialize static fields
3638 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3640 // VerifyOops believes that once this has been set, the object is completely loaded.
3641 // Compute transitive closure of interfaces this class implements
3642 this_klass->set_transitive_interfaces(transitive_interfaces());
3644 // Fill in information needed to compute superclasses.
3645 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3647 // Initialize itable offset tables
3648 klassItable::setup_itable_offset_table(this_klass);
3650 // Do final class setup
3651 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3653 set_precomputed_flags(this_klass);
3655 // reinitialize modifiers, using the InnerClasses attribute
3656 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3657 this_klass->set_modifier_flags(computed_modifiers);
3659 // check if this class can access its super class
3660 check_super_class_access(this_klass, CHECK_(nullHandle));
3662 // check if this class can access its superinterfaces
3663 check_super_interface_access(this_klass, CHECK_(nullHandle));
3665 // check if this class overrides any final method
3666 check_final_method_override(this_klass, CHECK_(nullHandle));
3668 // check that if this class is an interface then it doesn't have static methods
3669 if (this_klass->is_interface()) {
3670 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3671 }
3673 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3674 false /* not shared class */);
3676 if (TraceClassLoading) {
3677 // print in a single call to reduce interleaving of output
3678 if (cfs->source() != NULL) {
3679 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3680 cfs->source());
3681 } else if (class_loader.is_null()) {
3682 if (THREAD->is_Java_thread()) {
3683 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3684 tty->print("[Loaded %s by instance of %s]\n",
3685 this_klass->external_name(),
3686 instanceKlass::cast(caller)->external_name());
3687 } else {
3688 tty->print("[Loaded %s]\n", this_klass->external_name());
3689 }
3690 } else {
3691 ResourceMark rm;
3692 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3693 instanceKlass::cast(class_loader->klass())->external_name());
3694 }
3695 }
3697 if (TraceClassResolution) {
3698 // print out the superclass.
3699 const char * from = Klass::cast(this_klass())->external_name();
3700 if (this_klass->java_super() != NULL) {
3701 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3702 }
3703 // print out each of the interface classes referred to by this class.
3704 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3705 if (!local_interfaces.is_null()) {
3706 int length = local_interfaces->length();
3707 for (int i = 0; i < length; i++) {
3708 klassOop k = klassOop(local_interfaces->obj_at(i));
3709 instanceKlass* to_class = instanceKlass::cast(k);
3710 const char * to = to_class->external_name();
3711 tty->print("RESOLVE %s %s (interface)\n", from, to);
3712 }
3713 }
3714 }
3716 #ifndef PRODUCT
3717 if( PrintCompactFieldsSavings ) {
3718 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3719 tty->print("[Saved %d of %d bytes in %s]\n",
3720 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3721 orig_nonstatic_field_size*heapOopSize,
3722 this_klass->external_name());
3723 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3724 tty->print("[Wasted %d over %d bytes in %s]\n",
3725 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3726 orig_nonstatic_field_size*heapOopSize,
3727 this_klass->external_name());
3728 }
3729 }
3730 #endif
3732 // preserve result across HandleMark
3733 preserve_this_klass = this_klass();
3734 }
3736 // Create new handle outside HandleMark
3737 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3738 debug_only(this_klass->as_klassOop()->verify();)
3740 return this_klass;
3741 }
3744 unsigned int
3745 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3746 unsigned int nonstatic_oop_map_count,
3747 int first_nonstatic_oop_offset) {
3748 unsigned int map_count =
3749 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3750 if (nonstatic_oop_map_count > 0) {
3751 // We have oops to add to map
3752 if (map_count == 0) {
3753 map_count = nonstatic_oop_map_count;
3754 } else {
3755 // Check whether we should add a new map block or whether the last one can
3756 // be extended
3757 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3758 OopMapBlock* const last_map = first_map + map_count - 1;
3760 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3761 if (next_offset == first_nonstatic_oop_offset) {
3762 // There is no gap bettwen superklass's last oop field and first
3763 // local oop field, merge maps.
3764 nonstatic_oop_map_count -= 1;
3765 } else {
3766 // Superklass didn't end with a oop field, add extra maps
3767 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3768 }
3769 map_count += nonstatic_oop_map_count;
3770 }
3771 }
3772 return map_count;
3773 }
3776 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3777 unsigned int nonstatic_oop_map_count,
3778 int* nonstatic_oop_offsets,
3779 unsigned int* nonstatic_oop_counts) {
3780 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3781 const instanceKlass* const super = k->superklass();
3782 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3783 if (super_count > 0) {
3784 // Copy maps from superklass
3785 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3786 for (unsigned int i = 0; i < super_count; ++i) {
3787 *this_oop_map++ = *super_oop_map++;
3788 }
3789 }
3791 if (nonstatic_oop_map_count > 0) {
3792 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3793 // The counts differ because there is no gap between superklass's last oop
3794 // field and the first local oop field. Extend the last oop map copied
3795 // from the superklass instead of creating new one.
3796 nonstatic_oop_map_count--;
3797 nonstatic_oop_offsets++;
3798 this_oop_map--;
3799 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3800 this_oop_map++;
3801 }
3803 // Add new map blocks, fill them
3804 while (nonstatic_oop_map_count-- > 0) {
3805 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3806 this_oop_map->set_count(*nonstatic_oop_counts++);
3807 this_oop_map++;
3808 }
3809 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3810 this_oop_map, "sanity");
3811 }
3812 }
3815 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3816 klassOop super = k->super();
3818 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3819 // in which case we don't have to register objects as finalizable
3820 if (!_has_empty_finalizer) {
3821 if (_has_finalizer ||
3822 (super != NULL && super->klass_part()->has_finalizer())) {
3823 k->set_has_finalizer();
3824 }
3825 }
3827 #ifdef ASSERT
3828 bool f = false;
3829 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3830 vmSymbols::void_method_signature());
3831 if (m != NULL && !m->is_empty_method()) {
3832 f = true;
3833 }
3834 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3835 #endif
3837 // Check if this klass supports the java.lang.Cloneable interface
3838 if (SystemDictionary::Cloneable_klass_loaded()) {
3839 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3840 k->set_is_cloneable();
3841 }
3842 }
3844 // Check if this klass has a vanilla default constructor
3845 if (super == NULL) {
3846 // java.lang.Object has empty default constructor
3847 k->set_has_vanilla_constructor();
3848 } else {
3849 if (Klass::cast(super)->has_vanilla_constructor() &&
3850 _has_vanilla_constructor) {
3851 k->set_has_vanilla_constructor();
3852 }
3853 #ifdef ASSERT
3854 bool v = false;
3855 if (Klass::cast(super)->has_vanilla_constructor()) {
3856 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3857 ), vmSymbols::void_method_signature());
3858 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3859 v = true;
3860 }
3861 }
3862 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3863 #endif
3864 }
3866 // If it cannot be fast-path allocated, set a bit in the layout helper.
3867 // See documentation of instanceKlass::can_be_fastpath_allocated().
3868 assert(k->size_helper() > 0, "layout_helper is initialized");
3869 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3870 || k->is_abstract() || k->is_interface()
3871 || (k->name() == vmSymbols::java_lang_Class()
3872 && k->class_loader() == NULL)
3873 || k->size_helper() >= FastAllocateSizeLimit) {
3874 // Forbid fast-path allocation.
3875 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3876 k->set_layout_helper(lh);
3877 }
3878 }
3881 // utility method for appending and array with check for duplicates
3883 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3884 // iterate over new interfaces
3885 for (int i = 0; i < ifs->length(); i++) {
3886 oop e = ifs->obj_at(i);
3887 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3888 // check for duplicates
3889 bool duplicate = false;
3890 for (int j = 0; j < index; j++) {
3891 if (result->obj_at(j) == e) {
3892 duplicate = true;
3893 break;
3894 }
3895 }
3896 // add new interface
3897 if (!duplicate) {
3898 result->obj_at_put(index++, e);
3899 }
3900 }
3901 }
3903 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3904 // Compute maximum size for transitive interfaces
3905 int max_transitive_size = 0;
3906 int super_size = 0;
3907 // Add superclass transitive interfaces size
3908 if (super.not_null()) {
3909 super_size = super->transitive_interfaces()->length();
3910 max_transitive_size += super_size;
3911 }
3912 // Add local interfaces' super interfaces
3913 int local_size = local_ifs->length();
3914 for (int i = 0; i < local_size; i++) {
3915 klassOop l = klassOop(local_ifs->obj_at(i));
3916 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3917 }
3918 // Finally add local interfaces
3919 max_transitive_size += local_size;
3920 // Construct array
3921 objArrayHandle result;
3922 if (max_transitive_size == 0) {
3923 // no interfaces, use canonicalized array
3924 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3925 } else if (max_transitive_size == super_size) {
3926 // no new local interfaces added, share superklass' transitive interface array
3927 result = objArrayHandle(THREAD, super->transitive_interfaces());
3928 } else if (max_transitive_size == local_size) {
3929 // only local interfaces added, share local interface array
3930 result = local_ifs;
3931 } else {
3932 objArrayHandle nullHandle;
3933 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3934 result = objArrayHandle(THREAD, new_objarray);
3935 int index = 0;
3936 // Copy down from superclass
3937 if (super.not_null()) {
3938 append_interfaces(result, index, super->transitive_interfaces());
3939 }
3940 // Copy down from local interfaces' superinterfaces
3941 for (int i = 0; i < local_ifs->length(); i++) {
3942 klassOop l = klassOop(local_ifs->obj_at(i));
3943 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3944 }
3945 // Finally add local interfaces
3946 append_interfaces(result, index, local_ifs());
3948 // Check if duplicates were removed
3949 if (index != max_transitive_size) {
3950 assert(index < max_transitive_size, "just checking");
3951 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3952 for (int i = 0; i < index; i++) {
3953 oop e = result->obj_at(i);
3954 assert(e != NULL, "just checking");
3955 new_result->obj_at_put(i, e);
3956 }
3957 result = objArrayHandle(THREAD, new_result);
3958 }
3959 }
3960 return result;
3961 }
3964 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3965 klassOop super = this_klass->super();
3966 if ((super != NULL) &&
3967 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3968 ResourceMark rm(THREAD);
3969 Exceptions::fthrow(
3970 THREAD_AND_LOCATION,
3971 vmSymbols::java_lang_IllegalAccessError(),
3972 "class %s cannot access its superclass %s",
3973 this_klass->external_name(),
3974 instanceKlass::cast(super)->external_name()
3975 );
3976 return;
3977 }
3978 }
3981 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3982 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3983 int lng = local_interfaces->length();
3984 for (int i = lng - 1; i >= 0; i--) {
3985 klassOop k = klassOop(local_interfaces->obj_at(i));
3986 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3987 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3988 ResourceMark rm(THREAD);
3989 Exceptions::fthrow(
3990 THREAD_AND_LOCATION,
3991 vmSymbols::java_lang_IllegalAccessError(),
3992 "class %s cannot access its superinterface %s",
3993 this_klass->external_name(),
3994 instanceKlass::cast(k)->external_name()
3995 );
3996 return;
3997 }
3998 }
3999 }
4002 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4003 objArrayHandle methods (THREAD, this_klass->methods());
4004 int num_methods = methods->length();
4006 // go thru each method and check if it overrides a final method
4007 for (int index = 0; index < num_methods; index++) {
4008 methodOop m = (methodOop)methods->obj_at(index);
4010 // skip private, static and <init> methods
4011 if ((!m->is_private()) &&
4012 (!m->is_static()) &&
4013 (m->name() != vmSymbols::object_initializer_name())) {
4015 Symbol* name = m->name();
4016 Symbol* signature = m->signature();
4017 klassOop k = this_klass->super();
4018 methodOop super_m = NULL;
4019 while (k != NULL) {
4020 // skip supers that don't have final methods.
4021 if (k->klass_part()->has_final_method()) {
4022 // lookup a matching method in the super class hierarchy
4023 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
4024 if (super_m == NULL) {
4025 break; // didn't find any match; get out
4026 }
4028 if (super_m->is_final() &&
4029 // matching method in super is final
4030 (Reflection::verify_field_access(this_klass->as_klassOop(),
4031 super_m->method_holder(),
4032 super_m->method_holder(),
4033 super_m->access_flags(), false))
4034 // this class can access super final method and therefore override
4035 ) {
4036 ResourceMark rm(THREAD);
4037 Exceptions::fthrow(
4038 THREAD_AND_LOCATION,
4039 vmSymbols::java_lang_VerifyError(),
4040 "class %s overrides final method %s.%s",
4041 this_klass->external_name(),
4042 name->as_C_string(),
4043 signature->as_C_string()
4044 );
4045 return;
4046 }
4048 // continue to look from super_m's holder's super.
4049 k = instanceKlass::cast(super_m->method_holder())->super();
4050 continue;
4051 }
4053 k = k->klass_part()->super();
4054 }
4055 }
4056 }
4057 }
4060 // assumes that this_klass is an interface
4061 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4062 assert(this_klass->is_interface(), "not an interface");
4063 objArrayHandle methods (THREAD, this_klass->methods());
4064 int num_methods = methods->length();
4066 for (int index = 0; index < num_methods; index++) {
4067 methodOop m = (methodOop)methods->obj_at(index);
4068 // if m is static and not the init method, throw a verify error
4069 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4070 ResourceMark rm(THREAD);
4071 Exceptions::fthrow(
4072 THREAD_AND_LOCATION,
4073 vmSymbols::java_lang_VerifyError(),
4074 "Illegal static method %s in interface %s",
4075 m->name()->as_C_string(),
4076 this_klass->external_name()
4077 );
4078 return;
4079 }
4080 }
4081 }
4083 // utility methods for format checking
4085 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4086 if (!_need_verify) { return; }
4088 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4089 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4090 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4091 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4092 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4093 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4094 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4096 if ((is_abstract && is_final) ||
4097 (is_interface && !is_abstract) ||
4098 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4099 (!is_interface && major_gte_15 && is_annotation)) {
4100 ResourceMark rm(THREAD);
4101 Exceptions::fthrow(
4102 THREAD_AND_LOCATION,
4103 vmSymbols::java_lang_ClassFormatError(),
4104 "Illegal class modifiers in class %s: 0x%X",
4105 _class_name->as_C_string(), flags
4106 );
4107 return;
4108 }
4109 }
4111 bool ClassFileParser::has_illegal_visibility(jint flags) {
4112 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4113 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4114 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4116 return ((is_public && is_protected) ||
4117 (is_public && is_private) ||
4118 (is_protected && is_private));
4119 }
4121 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4122 u2 max_version =
4123 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4124 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4125 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4126 (major <= max_version) &&
4127 ((major != max_version) ||
4128 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4129 }
4131 void ClassFileParser::verify_legal_field_modifiers(
4132 jint flags, bool is_interface, TRAPS) {
4133 if (!_need_verify) { return; }
4135 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4136 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4137 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4138 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4139 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4140 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4141 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4142 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4143 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4145 bool is_illegal = false;
4147 if (is_interface) {
4148 if (!is_public || !is_static || !is_final || is_private ||
4149 is_protected || is_volatile || is_transient ||
4150 (major_gte_15 && is_enum)) {
4151 is_illegal = true;
4152 }
4153 } else { // not interface
4154 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4155 is_illegal = true;
4156 }
4157 }
4159 if (is_illegal) {
4160 ResourceMark rm(THREAD);
4161 Exceptions::fthrow(
4162 THREAD_AND_LOCATION,
4163 vmSymbols::java_lang_ClassFormatError(),
4164 "Illegal field modifiers in class %s: 0x%X",
4165 _class_name->as_C_string(), flags);
4166 return;
4167 }
4168 }
4170 void ClassFileParser::verify_legal_method_modifiers(
4171 jint flags, bool is_interface, Symbol* name, TRAPS) {
4172 if (!_need_verify) { return; }
4174 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4175 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4176 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4177 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4178 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4179 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4180 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4181 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4182 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4183 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4184 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4186 bool is_illegal = false;
4188 if (is_interface) {
4189 if (!is_abstract || !is_public || is_static || is_final ||
4190 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4191 is_illegal = true;
4192 }
4193 } else { // not interface
4194 if (is_initializer) {
4195 if (is_static || is_final || is_synchronized || is_native ||
4196 is_abstract || (major_gte_15 && is_bridge)) {
4197 is_illegal = true;
4198 }
4199 } else { // not initializer
4200 if (is_abstract) {
4201 if ((is_final || is_native || is_private || is_static ||
4202 (major_gte_15 && (is_synchronized || is_strict)))) {
4203 is_illegal = true;
4204 }
4205 }
4206 if (has_illegal_visibility(flags)) {
4207 is_illegal = true;
4208 }
4209 }
4210 }
4212 if (is_illegal) {
4213 ResourceMark rm(THREAD);
4214 Exceptions::fthrow(
4215 THREAD_AND_LOCATION,
4216 vmSymbols::java_lang_ClassFormatError(),
4217 "Method %s in class %s has illegal modifiers: 0x%X",
4218 name->as_C_string(), _class_name->as_C_string(), flags);
4219 return;
4220 }
4221 }
4223 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4224 assert(_need_verify, "only called when _need_verify is true");
4225 int i = 0;
4226 int count = length >> 2;
4227 for (int k=0; k<count; k++) {
4228 unsigned char b0 = buffer[i];
4229 unsigned char b1 = buffer[i+1];
4230 unsigned char b2 = buffer[i+2];
4231 unsigned char b3 = buffer[i+3];
4232 // For an unsigned char v,
4233 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4234 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4235 unsigned char res = b0 | b0 - 1 |
4236 b1 | b1 - 1 |
4237 b2 | b2 - 1 |
4238 b3 | b3 - 1;
4239 if (res >= 128) break;
4240 i += 4;
4241 }
4242 for(; i < length; i++) {
4243 unsigned short c;
4244 // no embedded zeros
4245 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4246 if(buffer[i] < 128) {
4247 continue;
4248 }
4249 if ((i + 5) < length) { // see if it's legal supplementary character
4250 if (UTF8::is_supplementary_character(&buffer[i])) {
4251 c = UTF8::get_supplementary_character(&buffer[i]);
4252 i += 5;
4253 continue;
4254 }
4255 }
4256 switch (buffer[i] >> 4) {
4257 default: break;
4258 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4259 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4260 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4261 c = (buffer[i] & 0x1F) << 6;
4262 i++;
4263 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4264 c += buffer[i] & 0x3F;
4265 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4266 // for classes with major > 47, c must a null or a character in its shortest form
4267 break;
4268 }
4269 }
4270 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4271 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4272 c = (buffer[i] & 0xF) << 12;
4273 i += 2;
4274 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4275 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4276 if (_major_version <= 47 || c >= 0x800) {
4277 // for classes with major > 47, c must be in its shortest form
4278 break;
4279 }
4280 }
4281 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4282 } // end of switch
4283 } // end of for
4284 }
4286 // Checks if name is a legal class name.
4287 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4288 if (!_need_verify || _relax_verify) { return; }
4290 char buf[fixed_buffer_size];
4291 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4292 unsigned int length = name->utf8_length();
4293 bool legal = false;
4295 if (length > 0) {
4296 char* p;
4297 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4298 p = skip_over_field_signature(bytes, false, length, CHECK);
4299 legal = (p != NULL) && ((p - bytes) == (int)length);
4300 } else if (_major_version < JAVA_1_5_VERSION) {
4301 if (bytes[0] != '<') {
4302 p = skip_over_field_name(bytes, true, length);
4303 legal = (p != NULL) && ((p - bytes) == (int)length);
4304 }
4305 } else {
4306 // 4900761: relax the constraints based on JSR202 spec
4307 // Class names may be drawn from the entire Unicode character set.
4308 // Identifiers between '/' must be unqualified names.
4309 // The utf8 string has been verified when parsing cpool entries.
4310 legal = verify_unqualified_name(bytes, length, LegalClass);
4311 }
4312 }
4313 if (!legal) {
4314 ResourceMark rm(THREAD);
4315 Exceptions::fthrow(
4316 THREAD_AND_LOCATION,
4317 vmSymbols::java_lang_ClassFormatError(),
4318 "Illegal class name \"%s\" in class file %s", bytes,
4319 _class_name->as_C_string()
4320 );
4321 return;
4322 }
4323 }
4325 // Checks if name is a legal field name.
4326 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4327 if (!_need_verify || _relax_verify) { return; }
4329 char buf[fixed_buffer_size];
4330 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4331 unsigned int length = name->utf8_length();
4332 bool legal = false;
4334 if (length > 0) {
4335 if (_major_version < JAVA_1_5_VERSION) {
4336 if (bytes[0] != '<') {
4337 char* p = skip_over_field_name(bytes, false, length);
4338 legal = (p != NULL) && ((p - bytes) == (int)length);
4339 }
4340 } else {
4341 // 4881221: relax the constraints based on JSR202 spec
4342 legal = verify_unqualified_name(bytes, length, LegalField);
4343 }
4344 }
4346 if (!legal) {
4347 ResourceMark rm(THREAD);
4348 Exceptions::fthrow(
4349 THREAD_AND_LOCATION,
4350 vmSymbols::java_lang_ClassFormatError(),
4351 "Illegal field name \"%s\" in class %s", bytes,
4352 _class_name->as_C_string()
4353 );
4354 return;
4355 }
4356 }
4358 // Checks if name is a legal method name.
4359 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4360 if (!_need_verify || _relax_verify) { return; }
4362 assert(name != NULL, "method name is null");
4363 char buf[fixed_buffer_size];
4364 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4365 unsigned int length = name->utf8_length();
4366 bool legal = false;
4368 if (length > 0) {
4369 if (bytes[0] == '<') {
4370 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4371 legal = true;
4372 }
4373 } else if (_major_version < JAVA_1_5_VERSION) {
4374 char* p;
4375 p = skip_over_field_name(bytes, false, length);
4376 legal = (p != NULL) && ((p - bytes) == (int)length);
4377 } else {
4378 // 4881221: relax the constraints based on JSR202 spec
4379 legal = verify_unqualified_name(bytes, length, LegalMethod);
4380 }
4381 }
4383 if (!legal) {
4384 ResourceMark rm(THREAD);
4385 Exceptions::fthrow(
4386 THREAD_AND_LOCATION,
4387 vmSymbols::java_lang_ClassFormatError(),
4388 "Illegal method name \"%s\" in class %s", bytes,
4389 _class_name->as_C_string()
4390 );
4391 return;
4392 }
4393 }
4396 // Checks if signature is a legal field signature.
4397 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4398 if (!_need_verify) { return; }
4400 char buf[fixed_buffer_size];
4401 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4402 unsigned int length = signature->utf8_length();
4403 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4405 if (p == NULL || (p - bytes) != (int)length) {
4406 throwIllegalSignature("Field", name, signature, CHECK);
4407 }
4408 }
4410 // Checks if signature is a legal method signature.
4411 // Returns number of parameters
4412 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4413 if (!_need_verify) {
4414 // make sure caller's args_size will be less than 0 even for non-static
4415 // method so it will be recomputed in compute_size_of_parameters().
4416 return -2;
4417 }
4419 unsigned int args_size = 0;
4420 char buf[fixed_buffer_size];
4421 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4422 unsigned int length = signature->utf8_length();
4423 char* nextp;
4425 // The first character must be a '('
4426 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4427 length--;
4428 // Skip over legal field signatures
4429 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4430 while ((length > 0) && (nextp != NULL)) {
4431 args_size++;
4432 if (p[0] == 'J' || p[0] == 'D') {
4433 args_size++;
4434 }
4435 length -= nextp - p;
4436 p = nextp;
4437 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4438 }
4439 // The first non-signature thing better be a ')'
4440 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4441 length--;
4442 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4443 // All internal methods must return void
4444 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4445 return args_size;
4446 }
4447 } else {
4448 // Now we better just have a return value
4449 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4450 if (nextp && ((int)length == (nextp - p))) {
4451 return args_size;
4452 }
4453 }
4454 }
4455 }
4456 // Report error
4457 throwIllegalSignature("Method", name, signature, CHECK_0);
4458 return 0;
4459 }
4462 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4463 // Method names also may not contain the characters '<' or '>', unless <init>
4464 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4465 // method. Because these names have been checked as special cases before
4466 // calling this method in verify_legal_method_name.
4467 bool ClassFileParser::verify_unqualified_name(
4468 char* name, unsigned int length, int type) {
4469 jchar ch;
4471 for (char* p = name; p != name + length; ) {
4472 ch = *p;
4473 if (ch < 128) {
4474 p++;
4475 if (ch == '.' || ch == ';' || ch == '[' ) {
4476 return false; // do not permit '.', ';', or '['
4477 }
4478 if (type != LegalClass && ch == '/') {
4479 return false; // do not permit '/' unless it's class name
4480 }
4481 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4482 return false; // do not permit '<' or '>' in method names
4483 }
4484 } else {
4485 char* tmp_p = UTF8::next(p, &ch);
4486 p = tmp_p;
4487 }
4488 }
4489 return true;
4490 }
4493 // Take pointer to a string. Skip over the longest part of the string that could
4494 // be taken as a fieldname. Allow '/' if slash_ok is true.
4495 // Return a pointer to just past the fieldname.
4496 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4497 // being true, we saw consecutive slashes (meaning we were looking for a
4498 // qualified path but found something that was badly-formed).
4499 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4500 char* p;
4501 jchar ch;
4502 jboolean last_is_slash = false;
4503 jboolean not_first_ch = false;
4505 for (p = name; p != name + length; not_first_ch = true) {
4506 char* old_p = p;
4507 ch = *p;
4508 if (ch < 128) {
4509 p++;
4510 // quick check for ascii
4511 if ((ch >= 'a' && ch <= 'z') ||
4512 (ch >= 'A' && ch <= 'Z') ||
4513 (ch == '_' || ch == '$') ||
4514 (not_first_ch && ch >= '0' && ch <= '9')) {
4515 last_is_slash = false;
4516 continue;
4517 }
4518 if (slash_ok && ch == '/') {
4519 if (last_is_slash) {
4520 return NULL; // Don't permit consecutive slashes
4521 }
4522 last_is_slash = true;
4523 continue;
4524 }
4525 } else {
4526 jint unicode_ch;
4527 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4528 p = tmp_p;
4529 last_is_slash = false;
4530 // Check if ch is Java identifier start or is Java identifier part
4531 // 4672820: call java.lang.Character methods directly without generating separate tables.
4532 EXCEPTION_MARK;
4533 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4535 // return value
4536 JavaValue result(T_BOOLEAN);
4537 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4538 JavaCallArguments args;
4539 args.push_int(unicode_ch);
4541 // public static boolean isJavaIdentifierStart(char ch);
4542 JavaCalls::call_static(&result,
4543 klass,
4544 vmSymbols::isJavaIdentifierStart_name(),
4545 vmSymbols::int_bool_signature(),
4546 &args,
4547 THREAD);
4549 if (HAS_PENDING_EXCEPTION) {
4550 CLEAR_PENDING_EXCEPTION;
4551 return 0;
4552 }
4553 if (result.get_jboolean()) {
4554 continue;
4555 }
4557 if (not_first_ch) {
4558 // public static boolean isJavaIdentifierPart(char ch);
4559 JavaCalls::call_static(&result,
4560 klass,
4561 vmSymbols::isJavaIdentifierPart_name(),
4562 vmSymbols::int_bool_signature(),
4563 &args,
4564 THREAD);
4566 if (HAS_PENDING_EXCEPTION) {
4567 CLEAR_PENDING_EXCEPTION;
4568 return 0;
4569 }
4571 if (result.get_jboolean()) {
4572 continue;
4573 }
4574 }
4575 }
4576 return (not_first_ch) ? old_p : NULL;
4577 }
4578 return (not_first_ch) ? p : NULL;
4579 }
4582 // Take pointer to a string. Skip over the longest part of the string that could
4583 // be taken as a field signature. Allow "void" if void_ok.
4584 // Return a pointer to just past the signature.
4585 // Return NULL if no legal signature is found.
4586 char* ClassFileParser::skip_over_field_signature(char* signature,
4587 bool void_ok,
4588 unsigned int length,
4589 TRAPS) {
4590 unsigned int array_dim = 0;
4591 while (length > 0) {
4592 switch (signature[0]) {
4593 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4594 case JVM_SIGNATURE_BOOLEAN:
4595 case JVM_SIGNATURE_BYTE:
4596 case JVM_SIGNATURE_CHAR:
4597 case JVM_SIGNATURE_SHORT:
4598 case JVM_SIGNATURE_INT:
4599 case JVM_SIGNATURE_FLOAT:
4600 case JVM_SIGNATURE_LONG:
4601 case JVM_SIGNATURE_DOUBLE:
4602 return signature + 1;
4603 case JVM_SIGNATURE_CLASS: {
4604 if (_major_version < JAVA_1_5_VERSION) {
4605 // Skip over the class name if one is there
4606 char* p = skip_over_field_name(signature + 1, true, --length);
4608 // The next character better be a semicolon
4609 if (p && (p - signature) > 1 && p[0] == ';') {
4610 return p + 1;
4611 }
4612 } else {
4613 // 4900761: For class version > 48, any unicode is allowed in class name.
4614 length--;
4615 signature++;
4616 while (length > 0 && signature[0] != ';') {
4617 if (signature[0] == '.') {
4618 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4619 }
4620 length--;
4621 signature++;
4622 }
4623 if (signature[0] == ';') { return signature + 1; }
4624 }
4626 return NULL;
4627 }
4628 case JVM_SIGNATURE_ARRAY:
4629 array_dim++;
4630 if (array_dim > 255) {
4631 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4632 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4633 }
4634 // The rest of what's there better be a legal signature
4635 signature++;
4636 length--;
4637 void_ok = false;
4638 break;
4640 default:
4641 return NULL;
4642 }
4643 }
4644 return NULL;
4645 }