Thu, 07 Apr 2011 17:12:21 -0700
7012087: JSR 292 Misleading exception message for a non-bound MH for a virtual method
Summary: Improve error message formatting to give more information to user. Also, catch a corner case related to 6930553 and 6844449.
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1997, 2011, 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/instanceMirrorKlass.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/klassOop.hpp"
43 #include "oops/klassVtable.hpp"
44 #include "oops/methodOop.hpp"
45 #include "oops/symbol.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/perfData.hpp"
49 #include "runtime/reflection.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/timer.hpp"
52 #include "services/classLoadingService.hpp"
53 #include "services/threadService.hpp"
55 // We generally try to create the oops directly when parsing, rather than
56 // allocating temporary data structures and copying the bytes twice. A
57 // temporary area is only needed when parsing utf8 entries in the constant
58 // pool and when parsing line number tables.
60 // We add assert in debug mode when class format is not checked.
62 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
63 #define JAVA_MIN_SUPPORTED_VERSION 45
64 #define JAVA_MAX_SUPPORTED_VERSION 51
65 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
67 // Used for two backward compatibility reasons:
68 // - to check for new additions to the class file format in JDK1.5
69 // - to check for bug fixes in the format checker in JDK1.5
70 #define JAVA_1_5_VERSION 49
72 // Used for backward compatibility reasons:
73 // - to check for javac bug fixes that happened after 1.5
74 // - also used as the max version when running in jdk6
75 #define JAVA_6_VERSION 50
77 // Used for backward compatibility reasons:
78 // - to check NameAndType_info signatures more aggressively
79 #define JAVA_7_VERSION 51
82 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
83 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
84 // this function (_current can be allocated in a register, with scalar
85 // replacement of aggregates). The _current pointer is copied back to
86 // stream() when this function returns. DON'T call another method within
87 // this method that uses stream().
88 ClassFileStream* cfs0 = stream();
89 ClassFileStream cfs1 = *cfs0;
90 ClassFileStream* cfs = &cfs1;
91 #ifdef ASSERT
92 assert(cfs->allocated_on_stack(),"should be local");
93 u1* old_current = cfs0->current();
94 #endif
96 // Used for batching symbol allocations.
97 const char* names[SymbolTable::symbol_alloc_batch_size];
98 int lengths[SymbolTable::symbol_alloc_batch_size];
99 int indices[SymbolTable::symbol_alloc_batch_size];
100 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
101 int names_count = 0;
103 // parsing Index 0 is unused
104 for (int index = 1; index < length; index++) {
105 // Each of the following case guarantees one more byte in the stream
106 // for the following tag or the access_flags following constant pool,
107 // so we don't need bounds-check for reading tag.
108 u1 tag = cfs->get_u1_fast();
109 switch (tag) {
110 case JVM_CONSTANT_Class :
111 {
112 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
113 u2 name_index = cfs->get_u2_fast();
114 cp->klass_index_at_put(index, name_index);
115 }
116 break;
117 case JVM_CONSTANT_Fieldref :
118 {
119 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
120 u2 class_index = cfs->get_u2_fast();
121 u2 name_and_type_index = cfs->get_u2_fast();
122 cp->field_at_put(index, class_index, name_and_type_index);
123 }
124 break;
125 case JVM_CONSTANT_Methodref :
126 {
127 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
128 u2 class_index = cfs->get_u2_fast();
129 u2 name_and_type_index = cfs->get_u2_fast();
130 cp->method_at_put(index, class_index, name_and_type_index);
131 }
132 break;
133 case JVM_CONSTANT_InterfaceMethodref :
134 {
135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
136 u2 class_index = cfs->get_u2_fast();
137 u2 name_and_type_index = cfs->get_u2_fast();
138 cp->interface_method_at_put(index, class_index, name_and_type_index);
139 }
140 break;
141 case JVM_CONSTANT_String :
142 {
143 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
144 u2 string_index = cfs->get_u2_fast();
145 cp->string_index_at_put(index, string_index);
146 }
147 break;
148 case JVM_CONSTANT_MethodHandle :
149 case JVM_CONSTANT_MethodType :
150 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
151 classfile_parse_error(
152 "Class file version does not support constant tag %u in class file %s",
153 tag, CHECK);
154 }
155 if (!EnableInvokeDynamic) {
156 classfile_parse_error(
157 "This JVM does not support constant tag %u in class file %s",
158 tag, CHECK);
159 }
160 if (tag == JVM_CONSTANT_MethodHandle) {
161 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
162 u1 ref_kind = cfs->get_u1_fast();
163 u2 method_index = cfs->get_u2_fast();
164 cp->method_handle_index_at_put(index, ref_kind, method_index);
165 } else if (tag == JVM_CONSTANT_MethodType) {
166 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
167 u2 signature_index = cfs->get_u2_fast();
168 cp->method_type_index_at_put(index, signature_index);
169 } else {
170 ShouldNotReachHere();
171 }
172 break;
173 case JVM_CONSTANT_InvokeDynamic :
174 {
175 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
176 classfile_parse_error(
177 "Class file version does not support constant tag %u in class file %s",
178 tag, CHECK);
179 }
180 if (!EnableInvokeDynamic) {
181 classfile_parse_error(
182 "This JVM does not support constant tag %u in class file %s",
183 tag, CHECK);
184 }
185 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
186 u2 bootstrap_specifier_index = cfs->get_u2_fast();
187 u2 name_and_type_index = cfs->get_u2_fast();
188 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
189 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
190 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
191 }
192 break;
193 case JVM_CONSTANT_Integer :
194 {
195 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
196 u4 bytes = cfs->get_u4_fast();
197 cp->int_at_put(index, (jint) bytes);
198 }
199 break;
200 case JVM_CONSTANT_Float :
201 {
202 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
203 u4 bytes = cfs->get_u4_fast();
204 cp->float_at_put(index, *(jfloat*)&bytes);
205 }
206 break;
207 case JVM_CONSTANT_Long :
208 // A mangled type might cause you to overrun allocated memory
209 guarantee_property(index+1 < length,
210 "Invalid constant pool entry %u in class file %s",
211 index, CHECK);
212 {
213 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
214 u8 bytes = cfs->get_u8_fast();
215 cp->long_at_put(index, bytes);
216 }
217 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
218 break;
219 case JVM_CONSTANT_Double :
220 // A mangled type might cause you to overrun allocated memory
221 guarantee_property(index+1 < length,
222 "Invalid constant pool entry %u in class file %s",
223 index, CHECK);
224 {
225 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
226 u8 bytes = cfs->get_u8_fast();
227 cp->double_at_put(index, *(jdouble*)&bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_NameAndType :
232 {
233 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
234 u2 name_index = cfs->get_u2_fast();
235 u2 signature_index = cfs->get_u2_fast();
236 cp->name_and_type_at_put(index, name_index, signature_index);
237 }
238 break;
239 case JVM_CONSTANT_Utf8 :
240 {
241 cfs->guarantee_more(2, CHECK); // utf8_length
242 u2 utf8_length = cfs->get_u2_fast();
243 u1* utf8_buffer = cfs->get_u1_buffer();
244 assert(utf8_buffer != NULL, "null utf8 buffer");
245 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
246 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
247 cfs->skip_u1_fast(utf8_length);
249 // Before storing the symbol, make sure it's legal
250 if (_need_verify) {
251 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
252 }
254 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
255 Handle patch = clear_cp_patch_at(index);
256 guarantee_property(java_lang_String::is_instance(patch()),
257 "Illegal utf8 patch at %d in class file %s",
258 index, CHECK);
259 char* str = java_lang_String::as_utf8_string(patch());
260 // (could use java_lang_String::as_symbol instead, but might as well batch them)
261 utf8_buffer = (u1*) str;
262 utf8_length = (int) strlen(str);
263 }
265 unsigned int hash;
266 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
267 if (result == NULL) {
268 names[names_count] = (char*)utf8_buffer;
269 lengths[names_count] = utf8_length;
270 indices[names_count] = index;
271 hashValues[names_count++] = hash;
272 if (names_count == SymbolTable::symbol_alloc_batch_size) {
273 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
274 names_count = 0;
275 }
276 } else {
277 cp->symbol_at_put(index, result);
278 }
279 }
280 break;
281 default:
282 classfile_parse_error(
283 "Unknown constant tag %u in class file %s", tag, CHECK);
284 break;
285 }
286 }
288 // Allocate the remaining symbols
289 if (names_count > 0) {
290 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
291 }
293 // Copy _current pointer of local copy back to stream().
294 #ifdef ASSERT
295 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
296 #endif
297 cfs0->set_current(cfs1.current());
298 }
300 // This class unreferences constant pool symbols if an error has occurred
301 // while parsing the class before it is assigned into the class.
302 // If it gets an error after that it is unloaded and the constant pool will
303 // be cleaned up then.
304 class ConstantPoolCleaner : public StackObj {
305 constantPoolHandle _cphandle;
306 bool _in_error;
307 public:
308 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
309 ~ConstantPoolCleaner() {
310 if (_in_error && _cphandle.not_null()) {
311 _cphandle->unreference_symbols();
312 }
313 }
314 void set_in_error(bool clean) { _in_error = clean; }
315 };
317 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
319 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
320 ClassFileStream* cfs = stream();
321 constantPoolHandle nullHandle;
323 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
324 u2 length = cfs->get_u2_fast();
325 guarantee_property(
326 length >= 1, "Illegal constant pool size %u in class file %s",
327 length, CHECK_(nullHandle));
328 constantPoolOop constant_pool =
329 oopFactory::new_constantPool(length,
330 oopDesc::IsSafeConc,
331 CHECK_(nullHandle));
332 constantPoolHandle cp (THREAD, constant_pool);
334 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
335 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
337 // parsing constant pool entries
338 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
340 int index = 1; // declared outside of loops for portability
342 // first verification pass - validate cross references and fixup class and string constants
343 for (index = 1; index < length; index++) { // Index 0 is unused
344 jbyte tag = cp->tag_at(index).value();
345 switch (tag) {
346 case JVM_CONSTANT_Class :
347 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
348 break;
349 case JVM_CONSTANT_Fieldref :
350 // fall through
351 case JVM_CONSTANT_Methodref :
352 // fall through
353 case JVM_CONSTANT_InterfaceMethodref : {
354 if (!_need_verify) break;
355 int klass_ref_index = cp->klass_ref_index_at(index);
356 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
357 check_property(valid_cp_range(klass_ref_index, length) &&
358 is_klass_reference(cp, klass_ref_index),
359 "Invalid constant pool index %u in class file %s",
360 klass_ref_index,
361 CHECK_(nullHandle));
362 check_property(valid_cp_range(name_and_type_ref_index, length) &&
363 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
364 "Invalid constant pool index %u in class file %s",
365 name_and_type_ref_index,
366 CHECK_(nullHandle));
367 break;
368 }
369 case JVM_CONSTANT_String :
370 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
371 break;
372 case JVM_CONSTANT_Integer :
373 break;
374 case JVM_CONSTANT_Float :
375 break;
376 case JVM_CONSTANT_Long :
377 case JVM_CONSTANT_Double :
378 index++;
379 check_property(
380 (index < length && cp->tag_at(index).is_invalid()),
381 "Improper constant pool long/double index %u in class file %s",
382 index, CHECK_(nullHandle));
383 break;
384 case JVM_CONSTANT_NameAndType : {
385 if (!_need_verify) break;
386 int name_ref_index = cp->name_ref_index_at(index);
387 int signature_ref_index = cp->signature_ref_index_at(index);
388 check_property(
389 valid_cp_range(name_ref_index, length) &&
390 cp->tag_at(name_ref_index).is_utf8(),
391 "Invalid constant pool index %u in class file %s",
392 name_ref_index, CHECK_(nullHandle));
393 check_property(
394 valid_cp_range(signature_ref_index, length) &&
395 cp->tag_at(signature_ref_index).is_utf8(),
396 "Invalid constant pool index %u in class file %s",
397 signature_ref_index, CHECK_(nullHandle));
398 break;
399 }
400 case JVM_CONSTANT_Utf8 :
401 break;
402 case JVM_CONSTANT_UnresolvedClass : // fall-through
403 case JVM_CONSTANT_UnresolvedClassInError:
404 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
405 break;
406 case JVM_CONSTANT_ClassIndex :
407 {
408 int class_index = cp->klass_index_at(index);
409 check_property(
410 valid_cp_range(class_index, length) &&
411 cp->tag_at(class_index).is_utf8(),
412 "Invalid constant pool index %u in class file %s",
413 class_index, CHECK_(nullHandle));
414 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
415 }
416 break;
417 case JVM_CONSTANT_UnresolvedString :
418 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
419 break;
420 case JVM_CONSTANT_StringIndex :
421 {
422 int string_index = cp->string_index_at(index);
423 check_property(
424 valid_cp_range(string_index, length) &&
425 cp->tag_at(string_index).is_utf8(),
426 "Invalid constant pool index %u in class file %s",
427 string_index, CHECK_(nullHandle));
428 Symbol* sym = cp->symbol_at(string_index);
429 cp->unresolved_string_at_put(index, sym);
430 }
431 break;
432 case JVM_CONSTANT_MethodHandle :
433 {
434 int ref_index = cp->method_handle_index_at(index);
435 check_property(
436 valid_cp_range(ref_index, length) &&
437 EnableInvokeDynamic,
438 "Invalid constant pool index %u in class file %s",
439 ref_index, CHECK_(nullHandle));
440 constantTag tag = cp->tag_at(ref_index);
441 int ref_kind = cp->method_handle_ref_kind_at(index);
442 switch (ref_kind) {
443 case JVM_REF_getField:
444 case JVM_REF_getStatic:
445 case JVM_REF_putField:
446 case JVM_REF_putStatic:
447 check_property(
448 tag.is_field(),
449 "Invalid constant pool index %u in class file %s (not a field)",
450 ref_index, CHECK_(nullHandle));
451 break;
452 case JVM_REF_invokeVirtual:
453 case JVM_REF_invokeStatic:
454 case JVM_REF_invokeSpecial:
455 case JVM_REF_newInvokeSpecial:
456 check_property(
457 tag.is_method(),
458 "Invalid constant pool index %u in class file %s (not a method)",
459 ref_index, CHECK_(nullHandle));
460 break;
461 case JVM_REF_invokeInterface:
462 check_property(
463 tag.is_interface_method(),
464 "Invalid constant pool index %u in class file %s (not an interface method)",
465 ref_index, CHECK_(nullHandle));
466 break;
467 default:
468 classfile_parse_error(
469 "Bad method handle kind at constant pool index %u in class file %s",
470 index, CHECK_(nullHandle));
471 }
472 // Keep the ref_index unchanged. It will be indirected at link-time.
473 }
474 break;
475 case JVM_CONSTANT_MethodType :
476 {
477 int ref_index = cp->method_type_index_at(index);
478 check_property(
479 valid_cp_range(ref_index, length) &&
480 cp->tag_at(ref_index).is_utf8() &&
481 EnableInvokeDynamic,
482 "Invalid constant pool index %u in class file %s",
483 ref_index, CHECK_(nullHandle));
484 }
485 break;
486 case JVM_CONSTANT_InvokeDynamic :
487 {
488 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
489 check_property(valid_cp_range(name_and_type_ref_index, length) &&
490 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
491 "Invalid constant pool index %u in class file %s",
492 name_and_type_ref_index,
493 CHECK_(nullHandle));
494 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
495 break;
496 }
497 default:
498 fatal(err_msg("bad constant pool tag value %u",
499 cp->tag_at(index).value()));
500 ShouldNotReachHere();
501 break;
502 } // end of switch
503 } // end of for
505 if (_cp_patches != NULL) {
506 // need to treat this_class specially...
507 assert(EnableInvokeDynamic, "");
508 int this_class_index;
509 {
510 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
511 u1* mark = cfs->current();
512 u2 flags = cfs->get_u2_fast();
513 this_class_index = cfs->get_u2_fast();
514 cfs->set_current(mark); // revert to mark
515 }
517 for (index = 1; index < length; index++) { // Index 0 is unused
518 if (has_cp_patch_at(index)) {
519 guarantee_property(index != this_class_index,
520 "Illegal constant pool patch to self at %d in class file %s",
521 index, CHECK_(nullHandle));
522 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
523 }
524 }
525 // Ensure that all the patches have been used.
526 for (index = 0; index < _cp_patches->length(); index++) {
527 guarantee_property(!has_cp_patch_at(index),
528 "Unused constant pool patch at %d in class file %s",
529 index, CHECK_(nullHandle));
530 }
531 }
533 if (!_need_verify) {
534 cp_in_error.set_in_error(false);
535 return cp;
536 }
538 // second verification pass - checks the strings are of the right format.
539 // but not yet to the other entries
540 for (index = 1; index < length; index++) {
541 jbyte tag = cp->tag_at(index).value();
542 switch (tag) {
543 case JVM_CONSTANT_UnresolvedClass: {
544 Symbol* class_name = cp->unresolved_klass_at(index);
545 // check the name, even if _cp_patches will overwrite it
546 verify_legal_class_name(class_name, CHECK_(nullHandle));
547 break;
548 }
549 case JVM_CONSTANT_NameAndType: {
550 if (_need_verify && _major_version >= JAVA_7_VERSION) {
551 int sig_index = cp->signature_ref_index_at(index);
552 int name_index = cp->name_ref_index_at(index);
553 Symbol* name = cp->symbol_at(name_index);
554 Symbol* sig = cp->symbol_at(sig_index);
555 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
556 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
557 } else {
558 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
559 }
560 }
561 break;
562 }
563 case JVM_CONSTANT_InvokeDynamic:
564 case JVM_CONSTANT_Fieldref:
565 case JVM_CONSTANT_Methodref:
566 case JVM_CONSTANT_InterfaceMethodref: {
567 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
568 // already verified to be utf8
569 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
570 // already verified to be utf8
571 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
572 Symbol* name = cp->symbol_at(name_ref_index);
573 Symbol* signature = cp->symbol_at(signature_ref_index);
574 if (tag == JVM_CONSTANT_Fieldref) {
575 verify_legal_field_name(name, CHECK_(nullHandle));
576 if (_need_verify && _major_version >= JAVA_7_VERSION) {
577 // Signature is verified above, when iterating NameAndType_info.
578 // Need only to be sure it's the right type.
579 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
580 throwIllegalSignature(
581 "Field", name, signature, CHECK_(nullHandle));
582 }
583 } else {
584 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
585 }
586 } else {
587 verify_legal_method_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 "Method", name, signature, CHECK_(nullHandle));
594 }
595 } else {
596 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
597 }
598 if (tag == JVM_CONSTANT_Methodref) {
599 // 4509014: If a class method name begins with '<', it must be "<init>".
600 assert(name != NULL, "method name in constant pool is null");
601 unsigned int name_len = name->utf8_length();
602 assert(name_len > 0, "bad method name"); // already verified as legal name
603 if (name->byte_at(0) == '<') {
604 if (name != vmSymbols::object_initializer_name()) {
605 classfile_parse_error(
606 "Bad method name at constant pool index %u in class file %s",
607 name_ref_index, CHECK_(nullHandle));
608 }
609 }
610 }
611 }
612 break;
613 }
614 case JVM_CONSTANT_MethodHandle: {
615 int ref_index = cp->method_handle_index_at(index);
616 int ref_kind = cp->method_handle_ref_kind_at(index);
617 switch (ref_kind) {
618 case JVM_REF_invokeVirtual:
619 case JVM_REF_invokeStatic:
620 case JVM_REF_invokeSpecial:
621 case JVM_REF_newInvokeSpecial:
622 {
623 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
624 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
625 Symbol* name = cp->symbol_at(name_ref_index);
626 if (ref_kind == JVM_REF_newInvokeSpecial) {
627 if (name != vmSymbols::object_initializer_name()) {
628 classfile_parse_error(
629 "Bad constructor name at constant pool index %u in class file %s",
630 name_ref_index, CHECK_(nullHandle));
631 }
632 } else {
633 if (name == vmSymbols::object_initializer_name()) {
634 classfile_parse_error(
635 "Bad method name at constant pool index %u in class file %s",
636 name_ref_index, CHECK_(nullHandle));
637 }
638 }
639 }
640 break;
641 // Other ref_kinds are already fully checked in previous pass.
642 }
643 break;
644 }
645 case JVM_CONSTANT_MethodType: {
646 Symbol* no_name = vmSymbols::type_name(); // place holder
647 Symbol* signature = cp->method_type_signature_at(index);
648 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
649 break;
650 }
651 case JVM_CONSTANT_Utf8: {
652 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
653 }
654 } // end of switch
655 } // end of for
657 cp_in_error.set_in_error(false);
658 return cp;
659 }
662 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
663 assert(EnableInvokeDynamic, "");
664 BasicType patch_type = T_VOID;
665 switch (cp->tag_at(index).value()) {
667 case JVM_CONSTANT_UnresolvedClass :
668 // Patching a class means pre-resolving it.
669 // The name in the constant pool is ignored.
670 if (java_lang_Class::is_instance(patch())) {
671 guarantee_property(!java_lang_Class::is_primitive(patch()),
672 "Illegal class patch at %d in class file %s",
673 index, CHECK);
674 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
675 } else {
676 guarantee_property(java_lang_String::is_instance(patch()),
677 "Illegal class patch at %d in class file %s",
678 index, CHECK);
679 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
680 cp->unresolved_klass_at_put(index, name);
681 }
682 break;
684 case JVM_CONSTANT_UnresolvedString :
685 // Patching a string means pre-resolving it.
686 // The spelling in the constant pool is ignored.
687 // The constant reference may be any object whatever.
688 // If it is not a real interned string, the constant is referred
689 // to as a "pseudo-string", and must be presented to the CP
690 // explicitly, because it may require scavenging.
691 cp->pseudo_string_at_put(index, patch());
692 break;
694 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
695 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
696 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
697 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
698 patch_prim:
699 {
700 jvalue value;
701 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
702 guarantee_property(value_type == patch_type,
703 "Illegal primitive patch at %d in class file %s",
704 index, CHECK);
705 switch (value_type) {
706 case T_INT: cp->int_at_put(index, value.i); break;
707 case T_FLOAT: cp->float_at_put(index, value.f); break;
708 case T_LONG: cp->long_at_put(index, value.j); break;
709 case T_DOUBLE: cp->double_at_put(index, value.d); break;
710 default: assert(false, "");
711 }
712 }
713 break;
715 default:
716 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
717 guarantee_property(!has_cp_patch_at(index),
718 "Illegal unexpected patch at %d in class file %s",
719 index, CHECK);
720 return;
721 }
723 // On fall-through, mark the patch as used.
724 clear_cp_patch_at(index);
725 }
729 class NameSigHash: public ResourceObj {
730 public:
731 Symbol* _name; // name
732 Symbol* _sig; // signature
733 NameSigHash* _next; // Next entry in hash table
734 };
737 #define HASH_ROW_SIZE 256
739 unsigned int hash(Symbol* name, Symbol* sig) {
740 unsigned int raw_hash = 0;
741 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
742 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
744 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
745 }
748 void initialize_hashtable(NameSigHash** table) {
749 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
750 }
752 // Return false if the name/sig combination is found in table.
753 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
754 // The old format checker uses heap sort to find duplicates.
755 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
756 // of table since we don't expect Symbol*'s to move.
757 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
758 assert(name != NULL, "name in constant pool is NULL");
760 // First lookup for duplicates
761 int index = hash(name, sig);
762 NameSigHash* entry = table[index];
763 while (entry != NULL) {
764 if (entry->_name == name && entry->_sig == sig) {
765 return false;
766 }
767 entry = entry->_next;
768 }
770 // No duplicate is found, allocate a new entry and fill it.
771 entry = new NameSigHash();
772 entry->_name = name;
773 entry->_sig = sig;
775 // Insert into hash table
776 entry->_next = table[index];
777 table[index] = entry;
779 return true;
780 }
783 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
784 int length,
785 Handle class_loader,
786 Handle protection_domain,
787 Symbol* class_name,
788 TRAPS) {
789 ClassFileStream* cfs = stream();
790 assert(length > 0, "only called for length>0");
791 objArrayHandle nullHandle;
792 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
793 objArrayHandle interfaces (THREAD, interface_oop);
795 int index;
796 for (index = 0; index < length; index++) {
797 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
798 KlassHandle interf;
799 check_property(
800 valid_cp_range(interface_index, cp->length()) &&
801 is_klass_reference(cp, interface_index),
802 "Interface name has bad constant pool index %u in class file %s",
803 interface_index, CHECK_(nullHandle));
804 if (cp->tag_at(interface_index).is_klass()) {
805 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
806 } else {
807 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
809 // Don't need to check legal name because it's checked when parsing constant pool.
810 // But need to make sure it's not an array type.
811 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
812 "Bad interface name in class file %s", CHECK_(nullHandle));
814 // Call resolve_super so classcircularity is checked
815 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
816 unresolved_klass, class_loader, protection_domain,
817 false, CHECK_(nullHandle));
818 interf = KlassHandle(THREAD, k);
820 if (LinkWellKnownClasses) // my super type is well known to me
821 cp->klass_at_put(interface_index, interf()); // eagerly resolve
822 }
824 if (!Klass::cast(interf())->is_interface()) {
825 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
826 }
827 interfaces->obj_at_put(index, interf());
828 }
830 if (!_need_verify || length <= 1) {
831 return interfaces;
832 }
834 // Check if there's any duplicates in interfaces
835 ResourceMark rm(THREAD);
836 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
837 THREAD, NameSigHash*, HASH_ROW_SIZE);
838 initialize_hashtable(interface_names);
839 bool dup = false;
840 {
841 debug_only(No_Safepoint_Verifier nsv;)
842 for (index = 0; index < length; index++) {
843 klassOop k = (klassOop)interfaces->obj_at(index);
844 Symbol* name = instanceKlass::cast(k)->name();
845 // If no duplicates, add (name, NULL) in hashtable interface_names.
846 if (!put_after_lookup(name, NULL, interface_names)) {
847 dup = true;
848 break;
849 }
850 }
851 }
852 if (dup) {
853 classfile_parse_error("Duplicate interface name in class file %s",
854 CHECK_(nullHandle));
855 }
857 return interfaces;
858 }
861 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
862 // Make sure the constant pool entry is of a type appropriate to this field
863 guarantee_property(
864 (constantvalue_index > 0 &&
865 constantvalue_index < cp->length()),
866 "Bad initial value index %u in ConstantValue attribute in class file %s",
867 constantvalue_index, CHECK);
868 constantTag value_type = cp->tag_at(constantvalue_index);
869 switch ( cp->basic_type_for_signature_at(signature_index) ) {
870 case T_LONG:
871 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
872 break;
873 case T_FLOAT:
874 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
875 break;
876 case T_DOUBLE:
877 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
878 break;
879 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
880 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
881 break;
882 case T_OBJECT:
883 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
884 && (value_type.is_string() || value_type.is_unresolved_string())),
885 "Bad string initial value in class file %s", CHECK);
886 break;
887 default:
888 classfile_parse_error(
889 "Unable to set initial value %u in class file %s",
890 constantvalue_index, CHECK);
891 }
892 }
895 // Parse attributes for a field.
896 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
897 u2 attributes_count,
898 bool is_static, u2 signature_index,
899 u2* constantvalue_index_addr,
900 bool* is_synthetic_addr,
901 u2* generic_signature_index_addr,
902 typeArrayHandle* field_annotations,
903 TRAPS) {
904 ClassFileStream* cfs = stream();
905 assert(attributes_count > 0, "length should be greater than 0");
906 u2 constantvalue_index = 0;
907 u2 generic_signature_index = 0;
908 bool is_synthetic = false;
909 u1* runtime_visible_annotations = NULL;
910 int runtime_visible_annotations_length = 0;
911 u1* runtime_invisible_annotations = NULL;
912 int runtime_invisible_annotations_length = 0;
913 while (attributes_count--) {
914 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
915 u2 attribute_name_index = cfs->get_u2_fast();
916 u4 attribute_length = cfs->get_u4_fast();
917 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
918 cp->tag_at(attribute_name_index).is_utf8(),
919 "Invalid field attribute index %u in class file %s",
920 attribute_name_index,
921 CHECK);
922 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
923 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
924 // ignore if non-static
925 if (constantvalue_index != 0) {
926 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
927 }
928 check_property(
929 attribute_length == 2,
930 "Invalid ConstantValue field attribute length %u in class file %s",
931 attribute_length, CHECK);
932 constantvalue_index = cfs->get_u2(CHECK);
933 if (_need_verify) {
934 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
935 }
936 } else if (attribute_name == vmSymbols::tag_synthetic()) {
937 if (attribute_length != 0) {
938 classfile_parse_error(
939 "Invalid Synthetic field attribute length %u in class file %s",
940 attribute_length, CHECK);
941 }
942 is_synthetic = true;
943 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
944 if (attribute_length != 0) {
945 classfile_parse_error(
946 "Invalid Deprecated field attribute length %u in class file %s",
947 attribute_length, CHECK);
948 }
949 } else if (_major_version >= JAVA_1_5_VERSION) {
950 if (attribute_name == vmSymbols::tag_signature()) {
951 if (attribute_length != 2) {
952 classfile_parse_error(
953 "Wrong size %u for field's Signature attribute in class file %s",
954 attribute_length, CHECK);
955 }
956 generic_signature_index = cfs->get_u2(CHECK);
957 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
958 runtime_visible_annotations_length = attribute_length;
959 runtime_visible_annotations = cfs->get_u1_buffer();
960 assert(runtime_visible_annotations != NULL, "null visible annotations");
961 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
962 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
963 runtime_invisible_annotations_length = attribute_length;
964 runtime_invisible_annotations = cfs->get_u1_buffer();
965 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
966 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
967 } else {
968 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
969 }
970 } else {
971 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
972 }
973 }
975 *constantvalue_index_addr = constantvalue_index;
976 *is_synthetic_addr = is_synthetic;
977 *generic_signature_index_addr = generic_signature_index;
978 *field_annotations = assemble_annotations(runtime_visible_annotations,
979 runtime_visible_annotations_length,
980 runtime_invisible_annotations,
981 runtime_invisible_annotations_length,
982 CHECK);
983 return;
984 }
987 // Field allocation types. Used for computing field offsets.
989 enum FieldAllocationType {
990 STATIC_OOP, // Oops
991 STATIC_BYTE, // Boolean, Byte, char
992 STATIC_SHORT, // shorts
993 STATIC_WORD, // ints
994 STATIC_DOUBLE, // long or double
995 STATIC_ALIGNED_DOUBLE,// aligned long or double
996 NONSTATIC_OOP,
997 NONSTATIC_BYTE,
998 NONSTATIC_SHORT,
999 NONSTATIC_WORD,
1000 NONSTATIC_DOUBLE,
1001 NONSTATIC_ALIGNED_DOUBLE
1002 };
1005 struct FieldAllocationCount {
1006 unsigned int static_oop_count;
1007 unsigned int static_byte_count;
1008 unsigned int static_short_count;
1009 unsigned int static_word_count;
1010 unsigned int static_double_count;
1011 unsigned int nonstatic_oop_count;
1012 unsigned int nonstatic_byte_count;
1013 unsigned int nonstatic_short_count;
1014 unsigned int nonstatic_word_count;
1015 unsigned int nonstatic_double_count;
1016 };
1018 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
1019 struct FieldAllocationCount *fac,
1020 objArrayHandle* fields_annotations, TRAPS) {
1021 ClassFileStream* cfs = stream();
1022 typeArrayHandle nullHandle;
1023 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1024 u2 length = cfs->get_u2_fast();
1025 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1026 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1027 typeArrayHandle fields(THREAD, new_fields);
1029 int index = 0;
1030 typeArrayHandle field_annotations;
1031 for (int n = 0; n < length; n++) {
1032 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1034 AccessFlags access_flags;
1035 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1036 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1037 access_flags.set_flags(flags);
1039 u2 name_index = cfs->get_u2_fast();
1040 int cp_size = cp->length();
1041 check_property(
1042 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1043 "Invalid constant pool index %u for field name in class file %s",
1044 name_index, CHECK_(nullHandle));
1045 Symbol* name = cp->symbol_at(name_index);
1046 verify_legal_field_name(name, CHECK_(nullHandle));
1048 u2 signature_index = cfs->get_u2_fast();
1049 check_property(
1050 valid_cp_range(signature_index, cp_size) &&
1051 cp->tag_at(signature_index).is_utf8(),
1052 "Invalid constant pool index %u for field signature in class file %s",
1053 signature_index, CHECK_(nullHandle));
1054 Symbol* sig = cp->symbol_at(signature_index);
1055 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1057 u2 constantvalue_index = 0;
1058 bool is_synthetic = false;
1059 u2 generic_signature_index = 0;
1060 bool is_static = access_flags.is_static();
1062 u2 attributes_count = cfs->get_u2_fast();
1063 if (attributes_count > 0) {
1064 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1065 &constantvalue_index, &is_synthetic,
1066 &generic_signature_index, &field_annotations,
1067 CHECK_(nullHandle));
1068 if (field_annotations.not_null()) {
1069 if (fields_annotations->is_null()) {
1070 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1071 *fields_annotations = objArrayHandle(THREAD, md);
1072 }
1073 (*fields_annotations)->obj_at_put(n, field_annotations());
1074 }
1075 if (is_synthetic) {
1076 access_flags.set_is_synthetic();
1077 }
1078 }
1080 fields->short_at_put(index++, access_flags.as_short());
1081 fields->short_at_put(index++, name_index);
1082 fields->short_at_put(index++, signature_index);
1083 fields->short_at_put(index++, constantvalue_index);
1085 // Remember how many oops we encountered and compute allocation type
1086 BasicType type = cp->basic_type_for_signature_at(signature_index);
1087 FieldAllocationType atype;
1088 if ( is_static ) {
1089 switch ( type ) {
1090 case T_BOOLEAN:
1091 case T_BYTE:
1092 fac->static_byte_count++;
1093 atype = STATIC_BYTE;
1094 break;
1095 case T_LONG:
1096 case T_DOUBLE:
1097 if (Universe::field_type_should_be_aligned(type)) {
1098 atype = STATIC_ALIGNED_DOUBLE;
1099 } else {
1100 atype = STATIC_DOUBLE;
1101 }
1102 fac->static_double_count++;
1103 break;
1104 case T_CHAR:
1105 case T_SHORT:
1106 fac->static_short_count++;
1107 atype = STATIC_SHORT;
1108 break;
1109 case T_FLOAT:
1110 case T_INT:
1111 fac->static_word_count++;
1112 atype = STATIC_WORD;
1113 break;
1114 case T_ARRAY:
1115 case T_OBJECT:
1116 fac->static_oop_count++;
1117 atype = STATIC_OOP;
1118 break;
1119 case T_ADDRESS:
1120 case T_VOID:
1121 default:
1122 assert(0, "bad field type");
1123 }
1124 } else {
1125 switch ( type ) {
1126 case T_BOOLEAN:
1127 case T_BYTE:
1128 fac->nonstatic_byte_count++;
1129 atype = NONSTATIC_BYTE;
1130 break;
1131 case T_LONG:
1132 case T_DOUBLE:
1133 if (Universe::field_type_should_be_aligned(type)) {
1134 atype = NONSTATIC_ALIGNED_DOUBLE;
1135 } else {
1136 atype = NONSTATIC_DOUBLE;
1137 }
1138 fac->nonstatic_double_count++;
1139 break;
1140 case T_CHAR:
1141 case T_SHORT:
1142 fac->nonstatic_short_count++;
1143 atype = NONSTATIC_SHORT;
1144 break;
1145 case T_FLOAT:
1146 case T_INT:
1147 fac->nonstatic_word_count++;
1148 atype = NONSTATIC_WORD;
1149 break;
1150 case T_ARRAY:
1151 case T_OBJECT:
1152 fac->nonstatic_oop_count++;
1153 atype = NONSTATIC_OOP;
1154 break;
1155 case T_ADDRESS:
1156 case T_VOID:
1157 default:
1158 assert(0, "bad field type");
1159 }
1160 }
1162 // The correct offset is computed later (all oop fields will be located together)
1163 // We temporarily store the allocation type in the offset field
1164 fields->short_at_put(index++, atype);
1165 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1166 fields->short_at_put(index++, generic_signature_index);
1167 }
1169 if (_need_verify && length > 1) {
1170 // Check duplicated fields
1171 ResourceMark rm(THREAD);
1172 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1173 THREAD, NameSigHash*, HASH_ROW_SIZE);
1174 initialize_hashtable(names_and_sigs);
1175 bool dup = false;
1176 {
1177 debug_only(No_Safepoint_Verifier nsv;)
1178 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1179 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1180 Symbol* name = cp->symbol_at(name_index);
1181 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1182 Symbol* sig = cp->symbol_at(sig_index);
1183 // If no duplicates, add name/signature in hashtable names_and_sigs.
1184 if (!put_after_lookup(name, sig, names_and_sigs)) {
1185 dup = true;
1186 break;
1187 }
1188 }
1189 }
1190 if (dup) {
1191 classfile_parse_error("Duplicate field name&signature in class file %s",
1192 CHECK_(nullHandle));
1193 }
1194 }
1196 return fields;
1197 }
1200 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1201 while (length-- > 0) {
1202 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1203 }
1204 }
1207 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1208 u4 exception_table_length,
1209 constantPoolHandle cp,
1210 TRAPS) {
1211 ClassFileStream* cfs = stream();
1212 typeArrayHandle nullHandle;
1214 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1215 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1216 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1218 int index = 0;
1219 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1220 for (unsigned int i = 0; i < exception_table_length; i++) {
1221 u2 start_pc = cfs->get_u2_fast();
1222 u2 end_pc = cfs->get_u2_fast();
1223 u2 handler_pc = cfs->get_u2_fast();
1224 u2 catch_type_index = cfs->get_u2_fast();
1225 // Will check legal target after parsing code array in verifier.
1226 if (_need_verify) {
1227 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1228 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1229 guarantee_property(handler_pc < code_length,
1230 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1231 if (catch_type_index != 0) {
1232 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1233 is_klass_reference(cp, catch_type_index),
1234 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1235 }
1236 }
1237 exception_handlers->int_at_put(index++, start_pc);
1238 exception_handlers->int_at_put(index++, end_pc);
1239 exception_handlers->int_at_put(index++, handler_pc);
1240 exception_handlers->int_at_put(index++, catch_type_index);
1241 }
1242 return exception_handlers;
1243 }
1245 void ClassFileParser::parse_linenumber_table(
1246 u4 code_attribute_length, u4 code_length,
1247 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1248 ClassFileStream* cfs = stream();
1249 unsigned int num_entries = cfs->get_u2(CHECK);
1251 // Each entry is a u2 start_pc, and a u2 line_number
1252 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1254 // Verify line number attribute and table length
1255 check_property(
1256 code_attribute_length == sizeof(u2) + length_in_bytes,
1257 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1259 cfs->guarantee_more(length_in_bytes, CHECK);
1261 if ((*write_stream) == NULL) {
1262 if (length_in_bytes > fixed_buffer_size) {
1263 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1264 } else {
1265 (*write_stream) = new CompressedLineNumberWriteStream(
1266 linenumbertable_buffer, fixed_buffer_size);
1267 }
1268 }
1270 while (num_entries-- > 0) {
1271 u2 bci = cfs->get_u2_fast(); // start_pc
1272 u2 line = cfs->get_u2_fast(); // line_number
1273 guarantee_property(bci < code_length,
1274 "Invalid pc in LineNumberTable in class file %s", CHECK);
1275 (*write_stream)->write_pair(bci, line);
1276 }
1277 }
1280 // Class file LocalVariableTable elements.
1281 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1282 public:
1283 u2 start_bci;
1284 u2 length;
1285 u2 name_cp_index;
1286 u2 descriptor_cp_index;
1287 u2 slot;
1288 };
1291 class LVT_Hash: public CHeapObj {
1292 public:
1293 LocalVariableTableElement *_elem; // element
1294 LVT_Hash* _next; // Next entry in hash table
1295 };
1297 unsigned int hash(LocalVariableTableElement *elem) {
1298 unsigned int raw_hash = elem->start_bci;
1300 raw_hash = elem->length + raw_hash * 37;
1301 raw_hash = elem->name_cp_index + raw_hash * 37;
1302 raw_hash = elem->slot + raw_hash * 37;
1304 return raw_hash % HASH_ROW_SIZE;
1305 }
1307 void initialize_hashtable(LVT_Hash** table) {
1308 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1309 table[i] = NULL;
1310 }
1311 }
1313 void clear_hashtable(LVT_Hash** table) {
1314 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1315 LVT_Hash* current = table[i];
1316 LVT_Hash* next;
1317 while (current != NULL) {
1318 next = current->_next;
1319 current->_next = NULL;
1320 delete(current);
1321 current = next;
1322 }
1323 table[i] = NULL;
1324 }
1325 }
1327 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1328 LVT_Hash* entry = table[index];
1330 /*
1331 * 3-tuple start_bci/length/slot has to be unique key,
1332 * so the following comparison seems to be redundant:
1333 * && elem->name_cp_index == entry->_elem->name_cp_index
1334 */
1335 while (entry != NULL) {
1336 if (elem->start_bci == entry->_elem->start_bci
1337 && elem->length == entry->_elem->length
1338 && elem->name_cp_index == entry->_elem->name_cp_index
1339 && elem->slot == entry->_elem->slot
1340 ) {
1341 return entry;
1342 }
1343 entry = entry->_next;
1344 }
1345 return NULL;
1346 }
1348 // Return false if the local variable is found in table.
1349 // Return true if no duplicate is found.
1350 // And local variable is added as a new entry in table.
1351 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1352 // First lookup for duplicates
1353 int index = hash(elem);
1354 LVT_Hash* entry = LVT_lookup(elem, index, table);
1356 if (entry != NULL) {
1357 return false;
1358 }
1359 // No duplicate is found, allocate a new entry and fill it.
1360 if ((entry = new LVT_Hash()) == NULL) {
1361 return false;
1362 }
1363 entry->_elem = elem;
1365 // Insert into hash table
1366 entry->_next = table[index];
1367 table[index] = entry;
1369 return true;
1370 }
1372 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1373 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1374 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1375 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1376 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1377 lvt->signature_cp_index = 0;
1378 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1379 }
1381 // Function is used to parse both attributes:
1382 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1383 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1384 u2 max_locals,
1385 u4 code_attribute_length,
1386 constantPoolHandle cp,
1387 u2* localvariable_table_length,
1388 bool isLVTT,
1389 TRAPS) {
1390 ClassFileStream* cfs = stream();
1391 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1392 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1393 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1394 // Verify local variable table attribute has right length
1395 if (_need_verify) {
1396 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1397 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1398 }
1399 u2* localvariable_table_start = cfs->get_u2_buffer();
1400 assert(localvariable_table_start != NULL, "null local variable table");
1401 if (!_need_verify) {
1402 cfs->skip_u2_fast(size);
1403 } else {
1404 cfs->guarantee_more(size * 2, CHECK_NULL);
1405 for(int i = 0; i < (*localvariable_table_length); i++) {
1406 u2 start_pc = cfs->get_u2_fast();
1407 u2 length = cfs->get_u2_fast();
1408 u2 name_index = cfs->get_u2_fast();
1409 u2 descriptor_index = cfs->get_u2_fast();
1410 u2 index = cfs->get_u2_fast();
1411 // Assign to a u4 to avoid overflow
1412 u4 end_pc = (u4)start_pc + (u4)length;
1414 if (start_pc >= code_length) {
1415 classfile_parse_error(
1416 "Invalid start_pc %u in %s in class file %s",
1417 start_pc, tbl_name, CHECK_NULL);
1418 }
1419 if (end_pc > code_length) {
1420 classfile_parse_error(
1421 "Invalid length %u in %s in class file %s",
1422 length, tbl_name, CHECK_NULL);
1423 }
1424 int cp_size = cp->length();
1425 guarantee_property(
1426 valid_cp_range(name_index, cp_size) &&
1427 cp->tag_at(name_index).is_utf8(),
1428 "Name index %u in %s has bad constant type in class file %s",
1429 name_index, tbl_name, CHECK_NULL);
1430 guarantee_property(
1431 valid_cp_range(descriptor_index, cp_size) &&
1432 cp->tag_at(descriptor_index).is_utf8(),
1433 "Signature index %u in %s has bad constant type in class file %s",
1434 descriptor_index, tbl_name, CHECK_NULL);
1436 Symbol* name = cp->symbol_at(name_index);
1437 Symbol* sig = cp->symbol_at(descriptor_index);
1438 verify_legal_field_name(name, CHECK_NULL);
1439 u2 extra_slot = 0;
1440 if (!isLVTT) {
1441 verify_legal_field_signature(name, sig, CHECK_NULL);
1443 // 4894874: check special cases for double and long local variables
1444 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1445 sig == vmSymbols::type_signature(T_LONG)) {
1446 extra_slot = 1;
1447 }
1448 }
1449 guarantee_property((index + extra_slot) < max_locals,
1450 "Invalid index %u in %s in class file %s",
1451 index, tbl_name, CHECK_NULL);
1452 }
1453 }
1454 return localvariable_table_start;
1455 }
1458 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1459 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1460 ClassFileStream* cfs = stream();
1461 u2 index = 0; // index in the array with long/double occupying two slots
1462 u4 i1 = *u1_index;
1463 u4 i2 = *u2_index + 1;
1464 for(int i = 0; i < array_length; i++) {
1465 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1466 index++;
1467 if (tag == ITEM_Long || tag == ITEM_Double) {
1468 index++;
1469 } else if (tag == ITEM_Object) {
1470 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1471 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1472 is_klass_reference(cp, class_index),
1473 "Bad class index %u in StackMap in class file %s",
1474 class_index, CHECK);
1475 } else if (tag == ITEM_Uninitialized) {
1476 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1477 guarantee_property(
1478 offset < code_length,
1479 "Bad uninitialized type offset %u in StackMap in class file %s",
1480 offset, CHECK);
1481 } else {
1482 guarantee_property(
1483 tag <= (u1)ITEM_Uninitialized,
1484 "Unknown variable type %u in StackMap in class file %s",
1485 tag, CHECK);
1486 }
1487 }
1488 u2_array[*u2_index] = index;
1489 *u1_index = i1;
1490 *u2_index = i2;
1491 }
1493 typeArrayOop ClassFileParser::parse_stackmap_table(
1494 u4 code_attribute_length, TRAPS) {
1495 if (code_attribute_length == 0)
1496 return NULL;
1498 ClassFileStream* cfs = stream();
1499 u1* stackmap_table_start = cfs->get_u1_buffer();
1500 assert(stackmap_table_start != NULL, "null stackmap table");
1502 // check code_attribute_length first
1503 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1505 if (!_need_verify && !DumpSharedSpaces) {
1506 return NULL;
1507 }
1509 typeArrayOop stackmap_data =
1510 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1512 stackmap_data->set_length(code_attribute_length);
1513 memcpy((void*)stackmap_data->byte_at_addr(0),
1514 (void*)stackmap_table_start, code_attribute_length);
1515 return stackmap_data;
1516 }
1518 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1519 u4 method_attribute_length,
1520 constantPoolHandle cp, TRAPS) {
1521 ClassFileStream* cfs = stream();
1522 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1523 *checked_exceptions_length = cfs->get_u2_fast();
1524 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1525 u2* checked_exceptions_start = cfs->get_u2_buffer();
1526 assert(checked_exceptions_start != NULL, "null checked exceptions");
1527 if (!_need_verify) {
1528 cfs->skip_u2_fast(size);
1529 } else {
1530 // Verify each value in the checked exception table
1531 u2 checked_exception;
1532 u2 len = *checked_exceptions_length;
1533 cfs->guarantee_more(2 * len, CHECK_NULL);
1534 for (int i = 0; i < len; i++) {
1535 checked_exception = cfs->get_u2_fast();
1536 check_property(
1537 valid_cp_range(checked_exception, cp->length()) &&
1538 is_klass_reference(cp, checked_exception),
1539 "Exception name has bad type at constant pool %u in class file %s",
1540 checked_exception, CHECK_NULL);
1541 }
1542 }
1543 // check exceptions attribute length
1544 if (_need_verify) {
1545 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1546 sizeof(u2) * size),
1547 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1548 }
1549 return checked_exceptions_start;
1550 }
1552 void ClassFileParser::throwIllegalSignature(
1553 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1554 ResourceMark rm(THREAD);
1555 Exceptions::fthrow(THREAD_AND_LOCATION,
1556 vmSymbols::java_lang_ClassFormatError(),
1557 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1558 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1559 }
1561 #define MAX_ARGS_SIZE 255
1562 #define MAX_CODE_SIZE 65535
1563 #define INITIAL_MAX_LVT_NUMBER 256
1565 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1566 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1567 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1568 // entire method attribute is parsed.
1569 //
1570 // The promoted_flags parameter is used to pass relevant access_flags
1571 // from the method back up to the containing klass. These flag values
1572 // are added to klass's access_flags.
1574 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1575 AccessFlags *promoted_flags,
1576 typeArrayHandle* method_annotations,
1577 typeArrayHandle* method_parameter_annotations,
1578 typeArrayHandle* method_default_annotations,
1579 TRAPS) {
1580 ClassFileStream* cfs = stream();
1581 methodHandle nullHandle;
1582 ResourceMark rm(THREAD);
1583 // Parse fixed parts
1584 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1586 int flags = cfs->get_u2_fast();
1587 u2 name_index = cfs->get_u2_fast();
1588 int cp_size = cp->length();
1589 check_property(
1590 valid_cp_range(name_index, cp_size) &&
1591 cp->tag_at(name_index).is_utf8(),
1592 "Illegal constant pool index %u for method name in class file %s",
1593 name_index, CHECK_(nullHandle));
1594 Symbol* name = cp->symbol_at(name_index);
1595 verify_legal_method_name(name, CHECK_(nullHandle));
1597 u2 signature_index = cfs->get_u2_fast();
1598 guarantee_property(
1599 valid_cp_range(signature_index, cp_size) &&
1600 cp->tag_at(signature_index).is_utf8(),
1601 "Illegal constant pool index %u for method signature in class file %s",
1602 signature_index, CHECK_(nullHandle));
1603 Symbol* signature = cp->symbol_at(signature_index);
1605 AccessFlags access_flags;
1606 if (name == vmSymbols::class_initializer_name()) {
1607 // We ignore the other access flags for a valid class initializer.
1608 // (JVM Spec 2nd ed., chapter 4.6)
1609 if (_major_version < 51) { // backward compatibility
1610 flags = JVM_ACC_STATIC;
1611 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1612 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1613 }
1614 } else {
1615 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1616 }
1618 int args_size = -1; // only used when _need_verify is true
1619 if (_need_verify) {
1620 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1621 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1622 if (args_size > MAX_ARGS_SIZE) {
1623 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1624 }
1625 }
1627 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1629 // Default values for code and exceptions attribute elements
1630 u2 max_stack = 0;
1631 u2 max_locals = 0;
1632 u4 code_length = 0;
1633 u1* code_start = 0;
1634 u2 exception_table_length = 0;
1635 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1636 u2 checked_exceptions_length = 0;
1637 u2* checked_exceptions_start = NULL;
1638 CompressedLineNumberWriteStream* linenumber_table = NULL;
1639 int linenumber_table_length = 0;
1640 int total_lvt_length = 0;
1641 u2 lvt_cnt = 0;
1642 u2 lvtt_cnt = 0;
1643 bool lvt_allocated = false;
1644 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1645 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1646 u2* localvariable_table_length;
1647 u2** localvariable_table_start;
1648 u2* localvariable_type_table_length;
1649 u2** localvariable_type_table_start;
1650 bool parsed_code_attribute = false;
1651 bool parsed_checked_exceptions_attribute = false;
1652 bool parsed_stackmap_attribute = false;
1653 // stackmap attribute - JDK1.5
1654 typeArrayHandle stackmap_data;
1655 u2 generic_signature_index = 0;
1656 u1* runtime_visible_annotations = NULL;
1657 int runtime_visible_annotations_length = 0;
1658 u1* runtime_invisible_annotations = NULL;
1659 int runtime_invisible_annotations_length = 0;
1660 u1* runtime_visible_parameter_annotations = NULL;
1661 int runtime_visible_parameter_annotations_length = 0;
1662 u1* runtime_invisible_parameter_annotations = NULL;
1663 int runtime_invisible_parameter_annotations_length = 0;
1664 u1* annotation_default = NULL;
1665 int annotation_default_length = 0;
1667 // Parse code and exceptions attribute
1668 u2 method_attributes_count = cfs->get_u2_fast();
1669 while (method_attributes_count--) {
1670 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1671 u2 method_attribute_name_index = cfs->get_u2_fast();
1672 u4 method_attribute_length = cfs->get_u4_fast();
1673 check_property(
1674 valid_cp_range(method_attribute_name_index, cp_size) &&
1675 cp->tag_at(method_attribute_name_index).is_utf8(),
1676 "Invalid method attribute name index %u in class file %s",
1677 method_attribute_name_index, CHECK_(nullHandle));
1679 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1680 if (method_attribute_name == vmSymbols::tag_code()) {
1681 // Parse Code attribute
1682 if (_need_verify) {
1683 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1684 "Code attribute in native or abstract methods in class file %s",
1685 CHECK_(nullHandle));
1686 }
1687 if (parsed_code_attribute) {
1688 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1689 }
1690 parsed_code_attribute = true;
1692 // Stack size, locals size, and code size
1693 if (_major_version == 45 && _minor_version <= 2) {
1694 cfs->guarantee_more(4, CHECK_(nullHandle));
1695 max_stack = cfs->get_u1_fast();
1696 max_locals = cfs->get_u1_fast();
1697 code_length = cfs->get_u2_fast();
1698 } else {
1699 cfs->guarantee_more(8, CHECK_(nullHandle));
1700 max_stack = cfs->get_u2_fast();
1701 max_locals = cfs->get_u2_fast();
1702 code_length = cfs->get_u4_fast();
1703 }
1704 if (_need_verify) {
1705 guarantee_property(args_size <= max_locals,
1706 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1707 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1708 "Invalid method Code length %u in class file %s",
1709 code_length, CHECK_(nullHandle));
1710 }
1711 // Code pointer
1712 code_start = cfs->get_u1_buffer();
1713 assert(code_start != NULL, "null code start");
1714 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1715 cfs->skip_u1_fast(code_length);
1717 // Exception handler table
1718 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1719 exception_table_length = cfs->get_u2_fast();
1720 if (exception_table_length > 0) {
1721 exception_handlers =
1722 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1723 }
1725 // Parse additional attributes in code attribute
1726 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1727 u2 code_attributes_count = cfs->get_u2_fast();
1729 unsigned int calculated_attribute_length = 0;
1731 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1732 calculated_attribute_length =
1733 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1734 } else {
1735 // max_stack, locals and length are smaller in pre-version 45.2 classes
1736 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1737 }
1738 calculated_attribute_length +=
1739 code_length +
1740 sizeof(exception_table_length) +
1741 sizeof(code_attributes_count) +
1742 exception_table_length *
1743 ( sizeof(u2) + // start_pc
1744 sizeof(u2) + // end_pc
1745 sizeof(u2) + // handler_pc
1746 sizeof(u2) ); // catch_type_index
1748 while (code_attributes_count--) {
1749 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1750 u2 code_attribute_name_index = cfs->get_u2_fast();
1751 u4 code_attribute_length = cfs->get_u4_fast();
1752 calculated_attribute_length += code_attribute_length +
1753 sizeof(code_attribute_name_index) +
1754 sizeof(code_attribute_length);
1755 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1756 cp->tag_at(code_attribute_name_index).is_utf8(),
1757 "Invalid code attribute name index %u in class file %s",
1758 code_attribute_name_index,
1759 CHECK_(nullHandle));
1760 if (LoadLineNumberTables &&
1761 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1762 // Parse and compress line number table
1763 parse_linenumber_table(code_attribute_length, code_length,
1764 &linenumber_table, CHECK_(nullHandle));
1766 } else if (LoadLocalVariableTables &&
1767 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1768 // Parse local variable table
1769 if (!lvt_allocated) {
1770 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1771 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1772 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1773 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1774 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1775 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1776 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1777 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1778 lvt_allocated = true;
1779 }
1780 if (lvt_cnt == max_lvt_cnt) {
1781 max_lvt_cnt <<= 1;
1782 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1783 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1784 }
1785 localvariable_table_start[lvt_cnt] =
1786 parse_localvariable_table(code_length,
1787 max_locals,
1788 code_attribute_length,
1789 cp,
1790 &localvariable_table_length[lvt_cnt],
1791 false, // is not LVTT
1792 CHECK_(nullHandle));
1793 total_lvt_length += localvariable_table_length[lvt_cnt];
1794 lvt_cnt++;
1795 } else if (LoadLocalVariableTypeTables &&
1796 _major_version >= JAVA_1_5_VERSION &&
1797 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1798 if (!lvt_allocated) {
1799 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1800 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1801 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1802 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1803 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1804 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1805 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1806 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1807 lvt_allocated = true;
1808 }
1809 // Parse local variable type table
1810 if (lvtt_cnt == max_lvtt_cnt) {
1811 max_lvtt_cnt <<= 1;
1812 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1813 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1814 }
1815 localvariable_type_table_start[lvtt_cnt] =
1816 parse_localvariable_table(code_length,
1817 max_locals,
1818 code_attribute_length,
1819 cp,
1820 &localvariable_type_table_length[lvtt_cnt],
1821 true, // is LVTT
1822 CHECK_(nullHandle));
1823 lvtt_cnt++;
1824 } else if (UseSplitVerifier &&
1825 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1826 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1827 // Stack map is only needed by the new verifier in JDK1.5.
1828 if (parsed_stackmap_attribute) {
1829 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1830 }
1831 typeArrayOop sm =
1832 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1833 stackmap_data = typeArrayHandle(THREAD, sm);
1834 parsed_stackmap_attribute = true;
1835 } else {
1836 // Skip unknown attributes
1837 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1838 }
1839 }
1840 // check method attribute length
1841 if (_need_verify) {
1842 guarantee_property(method_attribute_length == calculated_attribute_length,
1843 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1844 }
1845 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1846 // Parse Exceptions attribute
1847 if (parsed_checked_exceptions_attribute) {
1848 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1849 }
1850 parsed_checked_exceptions_attribute = true;
1851 checked_exceptions_start =
1852 parse_checked_exceptions(&checked_exceptions_length,
1853 method_attribute_length,
1854 cp, CHECK_(nullHandle));
1855 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1856 if (method_attribute_length != 0) {
1857 classfile_parse_error(
1858 "Invalid Synthetic method attribute length %u in class file %s",
1859 method_attribute_length, CHECK_(nullHandle));
1860 }
1861 // Should we check that there hasn't already been a synthetic attribute?
1862 access_flags.set_is_synthetic();
1863 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1864 if (method_attribute_length != 0) {
1865 classfile_parse_error(
1866 "Invalid Deprecated method attribute length %u in class file %s",
1867 method_attribute_length, CHECK_(nullHandle));
1868 }
1869 } else if (_major_version >= JAVA_1_5_VERSION) {
1870 if (method_attribute_name == vmSymbols::tag_signature()) {
1871 if (method_attribute_length != 2) {
1872 classfile_parse_error(
1873 "Invalid Signature attribute length %u in class file %s",
1874 method_attribute_length, CHECK_(nullHandle));
1875 }
1876 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1877 generic_signature_index = cfs->get_u2_fast();
1878 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1879 runtime_visible_annotations_length = method_attribute_length;
1880 runtime_visible_annotations = cfs->get_u1_buffer();
1881 assert(runtime_visible_annotations != NULL, "null visible annotations");
1882 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1883 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1884 runtime_invisible_annotations_length = method_attribute_length;
1885 runtime_invisible_annotations = cfs->get_u1_buffer();
1886 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1887 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1888 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1889 runtime_visible_parameter_annotations_length = method_attribute_length;
1890 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1891 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1892 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1893 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1894 runtime_invisible_parameter_annotations_length = method_attribute_length;
1895 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1896 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1897 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1898 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1899 annotation_default_length = method_attribute_length;
1900 annotation_default = cfs->get_u1_buffer();
1901 assert(annotation_default != NULL, "null annotation default");
1902 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1903 } else {
1904 // Skip unknown attributes
1905 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1906 }
1907 } else {
1908 // Skip unknown attributes
1909 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1910 }
1911 }
1913 if (linenumber_table != NULL) {
1914 linenumber_table->write_terminator();
1915 linenumber_table_length = linenumber_table->position();
1916 }
1918 // Make sure there's at least one Code attribute in non-native/non-abstract method
1919 if (_need_verify) {
1920 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1921 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1922 }
1924 // All sizing information for a methodOop is finally available, now create it
1925 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1926 total_lvt_length, checked_exceptions_length,
1927 oopDesc::IsSafeConc, CHECK_(nullHandle));
1928 methodHandle m (THREAD, m_oop);
1930 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1932 // Fill in information from fixed part (access_flags already set)
1933 m->set_constants(cp());
1934 m->set_name_index(name_index);
1935 m->set_signature_index(signature_index);
1936 m->set_generic_signature_index(generic_signature_index);
1937 #ifdef CC_INTERP
1938 // hmm is there a gc issue here??
1939 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1940 m->set_result_index(rtf.type());
1941 #endif
1943 if (args_size >= 0) {
1944 m->set_size_of_parameters(args_size);
1945 } else {
1946 m->compute_size_of_parameters(THREAD);
1947 }
1948 #ifdef ASSERT
1949 if (args_size >= 0) {
1950 m->compute_size_of_parameters(THREAD);
1951 assert(args_size == m->size_of_parameters(), "");
1952 }
1953 #endif
1955 // Fill in code attribute information
1956 m->set_max_stack(max_stack);
1957 m->set_max_locals(max_locals);
1958 m->constMethod()->set_stackmap_data(stackmap_data());
1960 /**
1961 * The exception_table field is the flag used to indicate
1962 * that the methodOop and it's associated constMethodOop are partially
1963 * initialized and thus are exempt from pre/post GC verification. Once
1964 * the field is set, the oops are considered fully initialized so make
1965 * sure that the oops can pass verification when this field is set.
1966 */
1967 m->set_exception_table(exception_handlers());
1969 // Copy byte codes
1970 m->set_code(code_start);
1972 // Copy line number table
1973 if (linenumber_table != NULL) {
1974 memcpy(m->compressed_linenumber_table(),
1975 linenumber_table->buffer(), linenumber_table_length);
1976 }
1978 // Copy checked exceptions
1979 if (checked_exceptions_length > 0) {
1980 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1981 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1982 }
1984 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1985 *
1986 * Rules for LVT's and LVTT's are:
1987 * - There can be any number of LVT's and LVTT's.
1988 * - If there are n LVT's, it is the same as if there was just
1989 * one LVT containing all the entries from the n LVT's.
1990 * - There may be no more than one LVT entry per local variable.
1991 * Two LVT entries are 'equal' if these fields are the same:
1992 * start_pc, length, name, slot
1993 * - There may be no more than one LVTT entry per each LVT entry.
1994 * Each LVTT entry has to match some LVT entry.
1995 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1996 */
1997 if (total_lvt_length > 0) {
1998 int tbl_no, idx;
2000 promoted_flags->set_has_localvariable_table();
2002 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2003 initialize_hashtable(lvt_Hash);
2005 // To fill LocalVariableTable in
2006 Classfile_LVT_Element* cf_lvt;
2007 LocalVariableTableElement* lvt = m->localvariable_table_start();
2009 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2010 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2011 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2012 copy_lvt_element(&cf_lvt[idx], lvt);
2013 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2014 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2015 && _need_verify
2016 && _major_version >= JAVA_1_5_VERSION ) {
2017 clear_hashtable(lvt_Hash);
2018 classfile_parse_error("Duplicated LocalVariableTable attribute "
2019 "entry for '%s' in class file %s",
2020 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2021 CHECK_(nullHandle));
2022 }
2023 }
2024 }
2026 // To merge LocalVariableTable and LocalVariableTypeTable
2027 Classfile_LVT_Element* cf_lvtt;
2028 LocalVariableTableElement lvtt_elem;
2030 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2031 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2032 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2033 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2034 int index = hash(&lvtt_elem);
2035 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2036 if (entry == NULL) {
2037 if (_need_verify) {
2038 clear_hashtable(lvt_Hash);
2039 classfile_parse_error("LVTT entry for '%s' in class file %s "
2040 "does not match any LVT entry",
2041 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2042 CHECK_(nullHandle));
2043 }
2044 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2045 clear_hashtable(lvt_Hash);
2046 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2047 "entry for '%s' in class file %s",
2048 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2049 CHECK_(nullHandle));
2050 } else {
2051 // to add generic signatures into LocalVariableTable
2052 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2053 }
2054 }
2055 }
2056 clear_hashtable(lvt_Hash);
2057 }
2059 *method_annotations = assemble_annotations(runtime_visible_annotations,
2060 runtime_visible_annotations_length,
2061 runtime_invisible_annotations,
2062 runtime_invisible_annotations_length,
2063 CHECK_(nullHandle));
2064 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2065 runtime_visible_parameter_annotations_length,
2066 runtime_invisible_parameter_annotations,
2067 runtime_invisible_parameter_annotations_length,
2068 CHECK_(nullHandle));
2069 *method_default_annotations = assemble_annotations(annotation_default,
2070 annotation_default_length,
2071 NULL,
2072 0,
2073 CHECK_(nullHandle));
2075 if (name == vmSymbols::finalize_method_name() &&
2076 signature == vmSymbols::void_method_signature()) {
2077 if (m->is_empty_method()) {
2078 _has_empty_finalizer = true;
2079 } else {
2080 _has_finalizer = true;
2081 }
2082 }
2083 if (name == vmSymbols::object_initializer_name() &&
2084 signature == vmSymbols::void_method_signature() &&
2085 m->is_vanilla_constructor()) {
2086 _has_vanilla_constructor = true;
2087 }
2089 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2090 m->is_method_handle_adapter())) {
2091 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2092 "Method handle invokers must be defined internally to the VM", nullHandle);
2093 }
2095 return m;
2096 }
2099 // The promoted_flags parameter is used to pass relevant access_flags
2100 // from the methods back up to the containing klass. These flag values
2101 // are added to klass's access_flags.
2103 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2104 AccessFlags* promoted_flags,
2105 bool* has_final_method,
2106 objArrayOop* methods_annotations_oop,
2107 objArrayOop* methods_parameter_annotations_oop,
2108 objArrayOop* methods_default_annotations_oop,
2109 TRAPS) {
2110 ClassFileStream* cfs = stream();
2111 objArrayHandle nullHandle;
2112 typeArrayHandle method_annotations;
2113 typeArrayHandle method_parameter_annotations;
2114 typeArrayHandle method_default_annotations;
2115 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2116 u2 length = cfs->get_u2_fast();
2117 if (length == 0) {
2118 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2119 } else {
2120 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2121 objArrayHandle methods(THREAD, m);
2122 HandleMark hm(THREAD);
2123 objArrayHandle methods_annotations;
2124 objArrayHandle methods_parameter_annotations;
2125 objArrayHandle methods_default_annotations;
2126 for (int index = 0; index < length; index++) {
2127 methodHandle method = parse_method(cp, is_interface,
2128 promoted_flags,
2129 &method_annotations,
2130 &method_parameter_annotations,
2131 &method_default_annotations,
2132 CHECK_(nullHandle));
2133 if (method->is_final()) {
2134 *has_final_method = true;
2135 }
2136 methods->obj_at_put(index, method());
2137 if (method_annotations.not_null()) {
2138 if (methods_annotations.is_null()) {
2139 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2140 methods_annotations = objArrayHandle(THREAD, md);
2141 }
2142 methods_annotations->obj_at_put(index, method_annotations());
2143 }
2144 if (method_parameter_annotations.not_null()) {
2145 if (methods_parameter_annotations.is_null()) {
2146 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2147 methods_parameter_annotations = objArrayHandle(THREAD, md);
2148 }
2149 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2150 }
2151 if (method_default_annotations.not_null()) {
2152 if (methods_default_annotations.is_null()) {
2153 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2154 methods_default_annotations = objArrayHandle(THREAD, md);
2155 }
2156 methods_default_annotations->obj_at_put(index, method_default_annotations());
2157 }
2158 }
2159 if (_need_verify && length > 1) {
2160 // Check duplicated methods
2161 ResourceMark rm(THREAD);
2162 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2163 THREAD, NameSigHash*, HASH_ROW_SIZE);
2164 initialize_hashtable(names_and_sigs);
2165 bool dup = false;
2166 {
2167 debug_only(No_Safepoint_Verifier nsv;)
2168 for (int i = 0; i < length; i++) {
2169 methodOop m = (methodOop)methods->obj_at(i);
2170 // If no duplicates, add name/signature in hashtable names_and_sigs.
2171 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2172 dup = true;
2173 break;
2174 }
2175 }
2176 }
2177 if (dup) {
2178 classfile_parse_error("Duplicate method name&signature in class file %s",
2179 CHECK_(nullHandle));
2180 }
2181 }
2183 *methods_annotations_oop = methods_annotations();
2184 *methods_parameter_annotations_oop = methods_parameter_annotations();
2185 *methods_default_annotations_oop = methods_default_annotations();
2187 return methods;
2188 }
2189 }
2192 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2193 objArrayHandle methods_annotations,
2194 objArrayHandle methods_parameter_annotations,
2195 objArrayHandle methods_default_annotations,
2196 TRAPS) {
2197 typeArrayHandle nullHandle;
2198 int length = methods()->length();
2199 // If JVMTI original method ordering is enabled we have to
2200 // remember the original class file ordering.
2201 // We temporarily use the vtable_index field in the methodOop to store the
2202 // class file index, so we can read in after calling qsort.
2203 if (JvmtiExport::can_maintain_original_method_order()) {
2204 for (int index = 0; index < length; index++) {
2205 methodOop m = methodOop(methods->obj_at(index));
2206 assert(!m->valid_vtable_index(), "vtable index should not be set");
2207 m->set_vtable_index(index);
2208 }
2209 }
2210 // Sort method array by ascending method name (for faster lookups & vtable construction)
2211 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2212 methodOopDesc::sort_methods(methods(),
2213 methods_annotations(),
2214 methods_parameter_annotations(),
2215 methods_default_annotations());
2217 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2218 if (JvmtiExport::can_maintain_original_method_order()) {
2219 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2220 typeArrayHandle method_ordering(THREAD, new_ordering);
2221 for (int index = 0; index < length; index++) {
2222 methodOop m = methodOop(methods->obj_at(index));
2223 int old_index = m->vtable_index();
2224 assert(old_index >= 0 && old_index < length, "invalid method index");
2225 method_ordering->int_at_put(index, old_index);
2226 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2227 }
2228 return method_ordering;
2229 } else {
2230 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2231 }
2232 }
2235 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2236 ClassFileStream* cfs = stream();
2237 cfs->guarantee_more(2, CHECK); // sourcefile_index
2238 u2 sourcefile_index = cfs->get_u2_fast();
2239 check_property(
2240 valid_cp_range(sourcefile_index, cp->length()) &&
2241 cp->tag_at(sourcefile_index).is_utf8(),
2242 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2243 sourcefile_index, CHECK);
2244 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2245 }
2249 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2250 instanceKlassHandle k,
2251 int length, TRAPS) {
2252 ClassFileStream* cfs = stream();
2253 u1* sde_buffer = cfs->get_u1_buffer();
2254 assert(sde_buffer != NULL, "null sde buffer");
2256 // Don't bother storing it if there is no way to retrieve it
2257 if (JvmtiExport::can_get_source_debug_extension()) {
2258 // Optimistically assume that only 1 byte UTF format is used
2259 // (common case)
2260 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2261 k->set_source_debug_extension(sde_symbol);
2262 // Note that set_source_debug_extension() increments the reference count
2263 // for its copy of the Symbol*, so use a TempNewSymbol here.
2264 }
2265 // Got utf8 string, set stream position forward
2266 cfs->skip_u1(length, CHECK);
2267 }
2270 // Inner classes can be static, private or protected (classic VM does this)
2271 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2273 // Return number of classes in the inner classes attribute table
2274 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2275 ClassFileStream* cfs = stream();
2276 cfs->guarantee_more(2, CHECK_0); // length
2277 u2 length = cfs->get_u2_fast();
2279 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2280 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2281 typeArrayHandle inner_classes(THREAD, ic);
2282 int index = 0;
2283 int cp_size = cp->length();
2284 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2285 for (int n = 0; n < length; n++) {
2286 // Inner class index
2287 u2 inner_class_info_index = cfs->get_u2_fast();
2288 check_property(
2289 inner_class_info_index == 0 ||
2290 (valid_cp_range(inner_class_info_index, cp_size) &&
2291 is_klass_reference(cp, inner_class_info_index)),
2292 "inner_class_info_index %u has bad constant type in class file %s",
2293 inner_class_info_index, CHECK_0);
2294 // Outer class index
2295 u2 outer_class_info_index = cfs->get_u2_fast();
2296 check_property(
2297 outer_class_info_index == 0 ||
2298 (valid_cp_range(outer_class_info_index, cp_size) &&
2299 is_klass_reference(cp, outer_class_info_index)),
2300 "outer_class_info_index %u has bad constant type in class file %s",
2301 outer_class_info_index, CHECK_0);
2302 // Inner class name
2303 u2 inner_name_index = cfs->get_u2_fast();
2304 check_property(
2305 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2306 cp->tag_at(inner_name_index).is_utf8()),
2307 "inner_name_index %u has bad constant type in class file %s",
2308 inner_name_index, CHECK_0);
2309 if (_need_verify) {
2310 guarantee_property(inner_class_info_index != outer_class_info_index,
2311 "Class is both outer and inner class in class file %s", CHECK_0);
2312 }
2313 // Access flags
2314 AccessFlags inner_access_flags;
2315 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2316 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2317 // Set abstract bit for old class files for backward compatibility
2318 flags |= JVM_ACC_ABSTRACT;
2319 }
2320 verify_legal_class_modifiers(flags, CHECK_0);
2321 inner_access_flags.set_flags(flags);
2323 inner_classes->short_at_put(index++, inner_class_info_index);
2324 inner_classes->short_at_put(index++, outer_class_info_index);
2325 inner_classes->short_at_put(index++, inner_name_index);
2326 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2327 }
2329 // 4347400: make sure there's no duplicate entry in the classes array
2330 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2331 for(int i = 0; i < inner_classes->length(); i += 4) {
2332 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2333 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2334 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2335 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2336 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2337 "Duplicate entry in InnerClasses in class file %s",
2338 CHECK_0);
2339 }
2340 }
2341 }
2343 // Update instanceKlass with inner class info.
2344 k->set_inner_classes(inner_classes());
2345 return length;
2346 }
2348 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2349 k->set_is_synthetic();
2350 }
2352 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2353 ClassFileStream* cfs = stream();
2354 u2 signature_index = cfs->get_u2(CHECK);
2355 check_property(
2356 valid_cp_range(signature_index, cp->length()) &&
2357 cp->tag_at(signature_index).is_utf8(),
2358 "Invalid constant pool index %u in Signature attribute in class file %s",
2359 signature_index, CHECK);
2360 k->set_generic_signature(cp->symbol_at(signature_index));
2361 }
2363 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2364 u4 attribute_byte_length, TRAPS) {
2365 ClassFileStream* cfs = stream();
2366 u1* current_start = cfs->current();
2368 cfs->guarantee_more(2, CHECK); // length
2369 int attribute_array_length = cfs->get_u2_fast();
2371 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2372 "Short length on BootstrapMethods in class file %s",
2373 CHECK);
2375 // The attribute contains a counted array of counted tuples of shorts,
2376 // represending bootstrap specifiers:
2377 // length*{bootstrap_method_index, argument_count*{argument_index}}
2378 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2379 // operand_count = number of shorts in attr, except for leading length
2381 // The attribute is copied into a short[] array.
2382 // The array begins with a series of short[2] pairs, one for each tuple.
2383 int index_size = (attribute_array_length * 2);
2385 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2386 typeArrayHandle operands(THREAD, operands_oop);
2387 operands_oop = NULL; // tidy
2389 int operand_fill_index = index_size;
2390 int cp_size = cp->length();
2392 for (int n = 0; n < attribute_array_length; n++) {
2393 // Store a 32-bit offset into the header of the operand array.
2394 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2395 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2397 // Read a bootstrap specifier.
2398 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2399 u2 bootstrap_method_index = cfs->get_u2_fast();
2400 u2 argument_count = cfs->get_u2_fast();
2401 check_property(
2402 valid_cp_range(bootstrap_method_index, cp_size) &&
2403 cp->tag_at(bootstrap_method_index).is_method_handle(),
2404 "bootstrap_method_index %u has bad constant type in class file %s",
2405 bootstrap_method_index,
2406 CHECK);
2407 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2408 operands->short_at_put(operand_fill_index++, argument_count);
2410 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2411 for (int j = 0; j < argument_count; j++) {
2412 u2 argument_index = cfs->get_u2_fast();
2413 check_property(
2414 valid_cp_range(argument_index, cp_size) &&
2415 cp->tag_at(argument_index).is_loadable_constant(),
2416 "argument_index %u has bad constant type in class file %s",
2417 argument_index,
2418 CHECK);
2419 operands->short_at_put(operand_fill_index++, argument_index);
2420 }
2421 }
2423 assert(operand_fill_index == operands()->length(), "exact fill");
2424 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2426 u1* current_end = cfs->current();
2427 guarantee_property(current_end == current_start + attribute_byte_length,
2428 "Bad length on BootstrapMethods in class file %s",
2429 CHECK);
2431 cp->set_operands(operands());
2432 }
2435 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2436 ClassFileStream* cfs = stream();
2437 // Set inner classes attribute to default sentinel
2438 k->set_inner_classes(Universe::the_empty_short_array());
2439 cfs->guarantee_more(2, CHECK); // attributes_count
2440 u2 attributes_count = cfs->get_u2_fast();
2441 bool parsed_sourcefile_attribute = false;
2442 bool parsed_innerclasses_attribute = false;
2443 bool parsed_enclosingmethod_attribute = false;
2444 bool parsed_bootstrap_methods_attribute = false;
2445 u1* runtime_visible_annotations = NULL;
2446 int runtime_visible_annotations_length = 0;
2447 u1* runtime_invisible_annotations = NULL;
2448 int runtime_invisible_annotations_length = 0;
2449 // Iterate over attributes
2450 while (attributes_count--) {
2451 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2452 u2 attribute_name_index = cfs->get_u2_fast();
2453 u4 attribute_length = cfs->get_u4_fast();
2454 check_property(
2455 valid_cp_range(attribute_name_index, cp->length()) &&
2456 cp->tag_at(attribute_name_index).is_utf8(),
2457 "Attribute name has bad constant pool index %u in class file %s",
2458 attribute_name_index, CHECK);
2459 Symbol* tag = cp->symbol_at(attribute_name_index);
2460 if (tag == vmSymbols::tag_source_file()) {
2461 // Check for SourceFile tag
2462 if (_need_verify) {
2463 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2464 }
2465 if (parsed_sourcefile_attribute) {
2466 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2467 } else {
2468 parsed_sourcefile_attribute = true;
2469 }
2470 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2471 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2472 // Check for SourceDebugExtension tag
2473 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2474 } else if (tag == vmSymbols::tag_inner_classes()) {
2475 // Check for InnerClasses tag
2476 if (parsed_innerclasses_attribute) {
2477 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2478 } else {
2479 parsed_innerclasses_attribute = true;
2480 }
2481 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2482 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2483 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2484 "Wrong InnerClasses attribute length in class file %s", CHECK);
2485 }
2486 } else if (tag == vmSymbols::tag_synthetic()) {
2487 // Check for Synthetic tag
2488 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2489 if (attribute_length != 0) {
2490 classfile_parse_error(
2491 "Invalid Synthetic classfile attribute length %u in class file %s",
2492 attribute_length, CHECK);
2493 }
2494 parse_classfile_synthetic_attribute(cp, k, CHECK);
2495 } else if (tag == vmSymbols::tag_deprecated()) {
2496 // Check for Deprecatd tag - 4276120
2497 if (attribute_length != 0) {
2498 classfile_parse_error(
2499 "Invalid Deprecated classfile attribute length %u in class file %s",
2500 attribute_length, CHECK);
2501 }
2502 } else if (_major_version >= JAVA_1_5_VERSION) {
2503 if (tag == vmSymbols::tag_signature()) {
2504 if (attribute_length != 2) {
2505 classfile_parse_error(
2506 "Wrong Signature attribute length %u in class file %s",
2507 attribute_length, CHECK);
2508 }
2509 parse_classfile_signature_attribute(cp, k, CHECK);
2510 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2511 runtime_visible_annotations_length = attribute_length;
2512 runtime_visible_annotations = cfs->get_u1_buffer();
2513 assert(runtime_visible_annotations != NULL, "null visible annotations");
2514 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2515 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2516 runtime_invisible_annotations_length = attribute_length;
2517 runtime_invisible_annotations = cfs->get_u1_buffer();
2518 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2519 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2520 } else if (tag == vmSymbols::tag_enclosing_method()) {
2521 if (parsed_enclosingmethod_attribute) {
2522 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2523 } else {
2524 parsed_enclosingmethod_attribute = true;
2525 }
2526 cfs->guarantee_more(4, CHECK); // class_index, method_index
2527 u2 class_index = cfs->get_u2_fast();
2528 u2 method_index = cfs->get_u2_fast();
2529 if (class_index == 0) {
2530 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2531 }
2532 // Validate the constant pool indices and types
2533 if (!cp->is_within_bounds(class_index) ||
2534 !is_klass_reference(cp, class_index)) {
2535 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2536 }
2537 if (method_index != 0 &&
2538 (!cp->is_within_bounds(method_index) ||
2539 !cp->tag_at(method_index).is_name_and_type())) {
2540 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2541 }
2542 k->set_enclosing_method_indices(class_index, method_index);
2543 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2544 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2545 if (parsed_bootstrap_methods_attribute)
2546 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2547 parsed_bootstrap_methods_attribute = true;
2548 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2549 } else {
2550 // Unknown attribute
2551 cfs->skip_u1(attribute_length, CHECK);
2552 }
2553 } else {
2554 // Unknown attribute
2555 cfs->skip_u1(attribute_length, CHECK);
2556 }
2557 }
2558 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2559 runtime_visible_annotations_length,
2560 runtime_invisible_annotations,
2561 runtime_invisible_annotations_length,
2562 CHECK);
2563 k->set_class_annotations(annotations());
2565 if (_max_bootstrap_specifier_index >= 0) {
2566 guarantee_property(parsed_bootstrap_methods_attribute,
2567 "Missing BootstrapMethods attribute in class file %s", CHECK);
2568 }
2569 }
2572 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2573 int runtime_visible_annotations_length,
2574 u1* runtime_invisible_annotations,
2575 int runtime_invisible_annotations_length, TRAPS) {
2576 typeArrayHandle annotations;
2577 if (runtime_visible_annotations != NULL ||
2578 runtime_invisible_annotations != NULL) {
2579 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2580 runtime_invisible_annotations_length, CHECK_(annotations));
2581 annotations = typeArrayHandle(THREAD, anno);
2582 if (runtime_visible_annotations != NULL) {
2583 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2584 }
2585 if (runtime_invisible_annotations != NULL) {
2586 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2587 }
2588 }
2589 return annotations;
2590 }
2593 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2594 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2595 // This code is for compatibility with earlier jdk's that do not
2596 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2597 // the check for the "discovered" field should issue a warning if
2598 // the field is not found. For 1.6 this code should be issue a
2599 // fatal error if the "discovered" field is not found.
2600 //
2601 // Increment fac.nonstatic_oop_count so that the start of the
2602 // next type of non-static oops leaves room for the fake oop.
2603 // Do not increment next_nonstatic_oop_offset so that the
2604 // fake oop is place after the java.lang.ref.Reference oop
2605 // fields.
2606 //
2607 // Check the fields in java.lang.ref.Reference for the "discovered"
2608 // field. If it is not present, artifically create a field for it.
2609 // This allows this VM to run on early JDK where the field is not
2610 // present.
2611 int reference_sig_index = 0;
2612 int reference_name_index = 0;
2613 int reference_index = 0;
2614 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2615 const int n = (*fields_ptr)()->length();
2616 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2617 int name_index =
2618 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2619 int sig_index =
2620 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2621 Symbol* f_name = cp->symbol_at(name_index);
2622 Symbol* f_sig = cp->symbol_at(sig_index);
2623 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2624 // Save the index for reference signature for later use.
2625 // The fake discovered field does not entries in the
2626 // constant pool so the index for its signature cannot
2627 // be extracted from the constant pool. It will need
2628 // later, however. It's signature is vmSymbols::reference_signature()
2629 // so same an index for that signature.
2630 reference_sig_index = sig_index;
2631 reference_name_index = name_index;
2632 reference_index = i;
2633 }
2634 if (f_name == vmSymbols::reference_discovered_name() &&
2635 f_sig == vmSymbols::reference_signature()) {
2636 // The values below are fake but will force extra
2637 // non-static oop fields and a corresponding non-static
2638 // oop map block to be allocated.
2639 extra = 0;
2640 break;
2641 }
2642 }
2643 if (extra != 0) {
2644 fac_ptr->nonstatic_oop_count += extra;
2645 // Add the additional entry to "fields" so that the klass
2646 // contains the "discoverd" field and the field will be initialized
2647 // in instances of the object.
2648 int fields_with_fix_length = (*fields_ptr)()->length() +
2649 instanceKlass::next_offset;
2650 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2651 fields_with_fix_length, CHECK);
2652 typeArrayHandle fields_with_fix(THREAD, ff);
2654 // Take everything from the original but the length.
2655 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2656 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2657 }
2659 // Add the fake field at the end.
2660 int i = (*fields_ptr)->length();
2661 // There is no name index for the fake "discovered" field nor
2662 // signature but a signature is needed so that the field will
2663 // be properly initialized. Use one found for
2664 // one of the other reference fields. Be sure the index for the
2665 // name is 0. In fieldDescriptor::initialize() the index of the
2666 // name is checked. That check is by passed for the last nonstatic
2667 // oop field in a java.lang.ref.Reference which is assumed to be
2668 // this artificial "discovered" field. An assertion checks that
2669 // the name index is 0.
2670 assert(reference_index != 0, "Missing signature for reference");
2672 int j;
2673 for (j = 0; j < instanceKlass::next_offset; j++) {
2674 fields_with_fix->ushort_at_put(i + j,
2675 (*fields_ptr)->ushort_at(reference_index +j));
2676 }
2677 // Clear the public access flag and set the private access flag.
2678 short flags;
2679 flags =
2680 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2681 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2682 flags = flags & (~JVM_ACC_PUBLIC);
2683 flags = flags | JVM_ACC_PRIVATE;
2684 AccessFlags access_flags;
2685 access_flags.set_flags(flags);
2686 assert(!access_flags.is_public(), "Failed to clear public flag");
2687 assert(access_flags.is_private(), "Failed to set private flag");
2688 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2689 flags);
2691 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2692 == reference_name_index, "The fake reference name is incorrect");
2693 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2694 == reference_sig_index, "The fake reference signature is incorrect");
2695 // The type of the field is stored in the low_offset entry during
2696 // parsing.
2697 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2698 NONSTATIC_OOP, "The fake reference type is incorrect");
2700 // "fields" is allocated in the permanent generation. Disgard
2701 // it and let it be collected.
2702 (*fields_ptr) = fields_with_fix;
2703 }
2704 return;
2705 }
2708 void ClassFileParser::java_lang_Class_fix_pre(int* nonstatic_field_size,
2709 FieldAllocationCount *fac_ptr) {
2710 // Add fake fields for java.lang.Class instances
2711 //
2712 // This is not particularly nice. We should consider adding a
2713 // private transient object field at the Java level to
2714 // java.lang.Class. Alternatively we could add a subclass of
2715 // instanceKlass which provides an accessor and size computer for
2716 // this field, but that appears to be more code than this hack.
2717 //
2718 // NOTE that we wedge these in at the beginning rather than the
2719 // end of the object because the Class layout changed between JDK
2720 // 1.3 and JDK 1.4 with the new reflection implementation; some
2721 // nonstatic oop fields were added at the Java level. The offsets
2722 // of these fake fields can't change between these two JDK
2723 // versions because when the offsets are computed at bootstrap
2724 // time we don't know yet which version of the JDK we're running in.
2726 // The values below are fake but will force three non-static oop fields and
2727 // a corresponding non-static oop map block to be allocated.
2728 const int extra = java_lang_Class::number_of_fake_oop_fields;
2729 fac_ptr->nonstatic_oop_count += extra;
2731 // Reserve some leading space for fake ints
2732 *nonstatic_field_size += align_size_up(java_lang_Class::hc_number_of_fake_int_fields * BytesPerInt, heapOopSize) / heapOopSize;
2733 }
2736 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2737 // Cause the extra fake fields in java.lang.Class to show up before
2738 // the Java fields for layout compatibility between 1.3 and 1.4
2739 // Incrementing next_nonstatic_oop_offset here advances the
2740 // location where the real java fields are placed.
2741 const int extra = java_lang_Class::number_of_fake_oop_fields;
2742 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2743 }
2746 // Force MethodHandle.vmentry to be an unmanaged pointer.
2747 // There is no way for a classfile to express this, so we must help it.
2748 void ClassFileParser::java_lang_invoke_MethodHandle_fix_pre(constantPoolHandle cp,
2749 typeArrayHandle fields,
2750 FieldAllocationCount *fac_ptr,
2751 TRAPS) {
2752 // Add fake fields for java.lang.invoke.MethodHandle instances
2753 //
2754 // This is not particularly nice, but since there is no way to express
2755 // a native wordSize field in Java, we must do it at this level.
2757 if (!EnableInvokeDynamic) return;
2759 int word_sig_index = 0;
2760 const int cp_size = cp->length();
2761 for (int index = 1; index < cp_size; index++) {
2762 if (cp->tag_at(index).is_utf8() &&
2763 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2764 word_sig_index = index;
2765 break;
2766 }
2767 }
2769 if (word_sig_index == 0)
2770 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2771 "missing I or J signature (for vmentry) in java.lang.invoke.MethodHandle");
2773 // Find vmentry field and change the signature.
2774 bool found_vmentry = false;
2775 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) {
2776 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
2777 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
2778 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset);
2779 Symbol* f_name = cp->symbol_at(name_index);
2780 Symbol* f_sig = cp->symbol_at(sig_index);
2781 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) {
2782 if (f_sig == vmSymbols::machine_word_signature()) {
2783 // If the signature of vmentry is already changed, we're done.
2784 found_vmentry = true;
2785 break;
2786 }
2787 else if (f_sig == vmSymbols::byte_signature()) {
2788 // Adjust the field type from byte to an unmanaged pointer.
2789 assert(fac_ptr->nonstatic_byte_count > 0, "");
2790 fac_ptr->nonstatic_byte_count -= 1;
2792 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2793 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2794 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2795 else fac_ptr->nonstatic_word_count += 1;
2797 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
2798 assert(atype == NONSTATIC_BYTE, "");
2799 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2800 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2802 found_vmentry = true;
2803 break;
2804 }
2805 }
2806 }
2808 if (!found_vmentry)
2809 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2810 "missing vmentry byte field in java.lang.invoke.MethodHandle");
2811 }
2814 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2815 Handle class_loader,
2816 Handle protection_domain,
2817 KlassHandle host_klass,
2818 GrowableArray<Handle>* cp_patches,
2819 TempNewSymbol& parsed_name,
2820 bool verify,
2821 TRAPS) {
2822 // So that JVMTI can cache class file in the state before retransformable agents
2823 // have modified it
2824 unsigned char *cached_class_file_bytes = NULL;
2825 jint cached_class_file_length;
2827 ClassFileStream* cfs = stream();
2828 // Timing
2829 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2830 JavaThread* jt = (JavaThread*) THREAD;
2832 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2833 ClassLoader::perf_class_parse_selftime(),
2834 NULL,
2835 jt->get_thread_stat()->perf_recursion_counts_addr(),
2836 jt->get_thread_stat()->perf_timers_addr(),
2837 PerfClassTraceTime::PARSE_CLASS);
2839 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2840 _max_bootstrap_specifier_index = -1;
2842 if (JvmtiExport::should_post_class_file_load_hook()) {
2843 unsigned char* ptr = cfs->buffer();
2844 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2846 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2847 &ptr, &end_ptr,
2848 &cached_class_file_bytes,
2849 &cached_class_file_length);
2851 if (ptr != cfs->buffer()) {
2852 // JVMTI agent has modified class file data.
2853 // Set new class file stream using JVMTI agent modified
2854 // class file data.
2855 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2856 set_stream(cfs);
2857 }
2858 }
2860 _host_klass = host_klass;
2861 _cp_patches = cp_patches;
2863 instanceKlassHandle nullHandle;
2865 // Figure out whether we can skip format checking (matching classic VM behavior)
2866 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2868 // Set the verify flag in stream
2869 cfs->set_verify(_need_verify);
2871 // Save the class file name for easier error message printing.
2872 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2874 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2875 // Magic value
2876 u4 magic = cfs->get_u4_fast();
2877 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2878 "Incompatible magic value %u in class file %s",
2879 magic, CHECK_(nullHandle));
2881 // Version numbers
2882 u2 minor_version = cfs->get_u2_fast();
2883 u2 major_version = cfs->get_u2_fast();
2885 // Check version numbers - we check this even with verifier off
2886 if (!is_supported_version(major_version, minor_version)) {
2887 if (name == NULL) {
2888 Exceptions::fthrow(
2889 THREAD_AND_LOCATION,
2890 vmSymbols::java_lang_UnsupportedClassVersionError(),
2891 "Unsupported major.minor version %u.%u",
2892 major_version,
2893 minor_version);
2894 } else {
2895 ResourceMark rm(THREAD);
2896 Exceptions::fthrow(
2897 THREAD_AND_LOCATION,
2898 vmSymbols::java_lang_UnsupportedClassVersionError(),
2899 "%s : Unsupported major.minor version %u.%u",
2900 name->as_C_string(),
2901 major_version,
2902 minor_version);
2903 }
2904 return nullHandle;
2905 }
2907 _major_version = major_version;
2908 _minor_version = minor_version;
2911 // Check if verification needs to be relaxed for this class file
2912 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2913 _relax_verify = Verifier::relax_verify_for(class_loader());
2915 // Constant pool
2916 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2917 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2919 int cp_size = cp->length();
2921 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2923 // Access flags
2924 AccessFlags access_flags;
2925 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2927 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2928 // Set abstract bit for old class files for backward compatibility
2929 flags |= JVM_ACC_ABSTRACT;
2930 }
2931 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2932 access_flags.set_flags(flags);
2934 // This class and superclass
2935 instanceKlassHandle super_klass;
2936 u2 this_class_index = cfs->get_u2_fast();
2937 check_property(
2938 valid_cp_range(this_class_index, cp_size) &&
2939 cp->tag_at(this_class_index).is_unresolved_klass(),
2940 "Invalid this class index %u in constant pool in class file %s",
2941 this_class_index, CHECK_(nullHandle));
2943 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2944 assert(class_name != NULL, "class_name can't be null");
2946 // It's important to set parsed_name *before* resolving the super class.
2947 // (it's used for cleanup by the caller if parsing fails)
2948 parsed_name = class_name;
2949 // parsed_name is returned and can be used if there's an error, so add to
2950 // its reference count. Caller will decrement the refcount.
2951 parsed_name->increment_refcount();
2953 // Update _class_name which could be null previously to be class_name
2954 _class_name = class_name;
2956 // Don't need to check whether this class name is legal or not.
2957 // It has been checked when constant pool is parsed.
2958 // However, make sure it is not an array type.
2959 if (_need_verify) {
2960 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2961 "Bad class name in class file %s",
2962 CHECK_(nullHandle));
2963 }
2965 klassOop preserve_this_klass; // for storing result across HandleMark
2967 // release all handles when parsing is done
2968 { HandleMark hm(THREAD);
2970 // Checks if name in class file matches requested name
2971 if (name != NULL && class_name != name) {
2972 ResourceMark rm(THREAD);
2973 Exceptions::fthrow(
2974 THREAD_AND_LOCATION,
2975 vmSymbols::java_lang_NoClassDefFoundError(),
2976 "%s (wrong name: %s)",
2977 name->as_C_string(),
2978 class_name->as_C_string()
2979 );
2980 return nullHandle;
2981 }
2983 if (TraceClassLoadingPreorder) {
2984 tty->print("[Loading %s", name->as_klass_external_name());
2985 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2986 tty->print_cr("]");
2987 }
2989 u2 super_class_index = cfs->get_u2_fast();
2990 if (super_class_index == 0) {
2991 check_property(class_name == vmSymbols::java_lang_Object(),
2992 "Invalid superclass index %u in class file %s",
2993 super_class_index,
2994 CHECK_(nullHandle));
2995 } else {
2996 check_property(valid_cp_range(super_class_index, cp_size) &&
2997 is_klass_reference(cp, super_class_index),
2998 "Invalid superclass index %u in class file %s",
2999 super_class_index,
3000 CHECK_(nullHandle));
3001 // The class name should be legal because it is checked when parsing constant pool.
3002 // However, make sure it is not an array type.
3003 bool is_array = false;
3004 if (cp->tag_at(super_class_index).is_klass()) {
3005 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3006 if (_need_verify)
3007 is_array = super_klass->oop_is_array();
3008 } else if (_need_verify) {
3009 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3010 }
3011 if (_need_verify) {
3012 guarantee_property(!is_array,
3013 "Bad superclass name in class file %s", CHECK_(nullHandle));
3014 }
3015 }
3017 // Interfaces
3018 u2 itfs_len = cfs->get_u2_fast();
3019 objArrayHandle local_interfaces;
3020 if (itfs_len == 0) {
3021 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3022 } else {
3023 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3024 }
3026 // Fields (offsets are filled in later)
3027 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
3028 objArrayHandle fields_annotations;
3029 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
3030 // Methods
3031 bool has_final_method = false;
3032 AccessFlags promoted_flags;
3033 promoted_flags.set_flags(0);
3034 // These need to be oop pointers because they are allocated lazily
3035 // inside parse_methods inside a nested HandleMark
3036 objArrayOop methods_annotations_oop = NULL;
3037 objArrayOop methods_parameter_annotations_oop = NULL;
3038 objArrayOop methods_default_annotations_oop = NULL;
3039 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3040 &promoted_flags,
3041 &has_final_method,
3042 &methods_annotations_oop,
3043 &methods_parameter_annotations_oop,
3044 &methods_default_annotations_oop,
3045 CHECK_(nullHandle));
3047 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3048 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3049 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3051 // We check super class after class file is parsed and format is checked
3052 if (super_class_index > 0 && super_klass.is_null()) {
3053 Symbol* sk = cp->klass_name_at(super_class_index);
3054 if (access_flags.is_interface()) {
3055 // Before attempting to resolve the superclass, check for class format
3056 // errors not checked yet.
3057 guarantee_property(sk == vmSymbols::java_lang_Object(),
3058 "Interfaces must have java.lang.Object as superclass in class file %s",
3059 CHECK_(nullHandle));
3060 }
3061 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3062 sk,
3063 class_loader,
3064 protection_domain,
3065 true,
3066 CHECK_(nullHandle));
3068 KlassHandle kh (THREAD, k);
3069 super_klass = instanceKlassHandle(THREAD, kh());
3070 if (LinkWellKnownClasses) // my super class is well known to me
3071 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3072 }
3073 if (super_klass.not_null()) {
3074 if (super_klass->is_interface()) {
3075 ResourceMark rm(THREAD);
3076 Exceptions::fthrow(
3077 THREAD_AND_LOCATION,
3078 vmSymbols::java_lang_IncompatibleClassChangeError(),
3079 "class %s has interface %s as super class",
3080 class_name->as_klass_external_name(),
3081 super_klass->external_name()
3082 );
3083 return nullHandle;
3084 }
3085 // Make sure super class is not final
3086 if (super_klass->is_final()) {
3087 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3088 }
3089 }
3091 // Compute the transitive list of all unique interfaces implemented by this class
3092 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3094 // sort methods
3095 typeArrayHandle method_ordering = sort_methods(methods,
3096 methods_annotations,
3097 methods_parameter_annotations,
3098 methods_default_annotations,
3099 CHECK_(nullHandle));
3101 // promote flags from parse_methods() to the klass' flags
3102 access_flags.add_promoted_flags(promoted_flags.as_int());
3104 // Size of Java vtable (in words)
3105 int vtable_size = 0;
3106 int itable_size = 0;
3107 int num_miranda_methods = 0;
3109 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3110 num_miranda_methods,
3111 super_klass(),
3112 methods(),
3113 access_flags,
3114 class_loader,
3115 class_name,
3116 local_interfaces(),
3117 CHECK_(nullHandle));
3119 // Size of Java itable (in words)
3120 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3122 // Field size and offset computation
3123 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3124 #ifndef PRODUCT
3125 int orig_nonstatic_field_size = 0;
3126 #endif
3127 int static_field_size = 0;
3128 int next_static_oop_offset;
3129 int next_static_double_offset;
3130 int next_static_word_offset;
3131 int next_static_short_offset;
3132 int next_static_byte_offset;
3133 int next_static_type_offset;
3134 int next_nonstatic_oop_offset;
3135 int next_nonstatic_double_offset;
3136 int next_nonstatic_word_offset;
3137 int next_nonstatic_short_offset;
3138 int next_nonstatic_byte_offset;
3139 int next_nonstatic_type_offset;
3140 int first_nonstatic_oop_offset;
3141 int first_nonstatic_field_offset;
3142 int next_nonstatic_field_offset;
3144 // Calculate the starting byte offsets
3145 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3146 next_static_double_offset = next_static_oop_offset +
3147 (fac.static_oop_count * heapOopSize);
3148 if ( fac.static_double_count &&
3149 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3150 Universe::field_type_should_be_aligned(T_LONG)) ) {
3151 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3152 }
3154 next_static_word_offset = next_static_double_offset +
3155 (fac.static_double_count * BytesPerLong);
3156 next_static_short_offset = next_static_word_offset +
3157 (fac.static_word_count * BytesPerInt);
3158 next_static_byte_offset = next_static_short_offset +
3159 (fac.static_short_count * BytesPerShort);
3160 next_static_type_offset = align_size_up((next_static_byte_offset +
3161 fac.static_byte_count ), wordSize );
3162 static_field_size = (next_static_type_offset -
3163 next_static_oop_offset) / wordSize;
3165 // Add fake fields for java.lang.Class instances (also see below)
3166 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3167 java_lang_Class_fix_pre(&nonstatic_field_size, &fac);
3168 }
3170 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3171 nonstatic_field_size * heapOopSize;
3172 next_nonstatic_field_offset = first_nonstatic_field_offset;
3174 // adjust the vmentry field declaration in java.lang.invoke.MethodHandle
3175 if (EnableInvokeDynamic && class_name == vmSymbols::java_lang_invoke_MethodHandle() && class_loader.is_null()) {
3176 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3177 }
3179 // Add a fake "discovered" field if it is not present
3180 // for compatibility with earlier jdk's.
3181 if (class_name == vmSymbols::java_lang_ref_Reference()
3182 && class_loader.is_null()) {
3183 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3184 }
3185 // end of "discovered" field compactibility fix
3187 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3188 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3189 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3190 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3191 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3193 bool super_has_nonstatic_fields =
3194 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3195 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3196 ((nonstatic_double_count + nonstatic_word_count +
3197 nonstatic_short_count + nonstatic_byte_count +
3198 nonstatic_oop_count) != 0);
3201 // Prepare list of oops for oop map generation.
3202 int* nonstatic_oop_offsets;
3203 unsigned int* nonstatic_oop_counts;
3204 unsigned int nonstatic_oop_map_count = 0;
3206 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3207 THREAD, int, nonstatic_oop_count + 1);
3208 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3209 THREAD, unsigned int, nonstatic_oop_count + 1);
3211 // Add fake fields for java.lang.Class instances (also see above).
3212 // FieldsAllocationStyle and CompactFields values will be reset to default.
3213 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3214 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3215 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3216 const uint fake_oop_count = (next_nonstatic_field_offset -
3217 first_nonstatic_field_offset) / heapOopSize;
3218 nonstatic_oop_counts[0] = fake_oop_count;
3219 nonstatic_oop_map_count = 1;
3220 nonstatic_oop_count -= fake_oop_count;
3221 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3222 } else {
3223 first_nonstatic_oop_offset = 0; // will be set for first oop field
3224 }
3226 #ifndef PRODUCT
3227 if( PrintCompactFieldsSavings ) {
3228 next_nonstatic_double_offset = next_nonstatic_field_offset +
3229 (nonstatic_oop_count * heapOopSize);
3230 if ( nonstatic_double_count > 0 ) {
3231 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3232 }
3233 next_nonstatic_word_offset = next_nonstatic_double_offset +
3234 (nonstatic_double_count * BytesPerLong);
3235 next_nonstatic_short_offset = next_nonstatic_word_offset +
3236 (nonstatic_word_count * BytesPerInt);
3237 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3238 (nonstatic_short_count * BytesPerShort);
3239 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3240 nonstatic_byte_count ), heapOopSize );
3241 orig_nonstatic_field_size = nonstatic_field_size +
3242 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3243 }
3244 #endif
3245 bool compact_fields = CompactFields;
3246 int allocation_style = FieldsAllocationStyle;
3247 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3248 assert(false, "0 <= FieldsAllocationStyle <= 2");
3249 allocation_style = 1; // Optimistic
3250 }
3252 // The next classes have predefined hard-coded fields offsets
3253 // (see in JavaClasses::compute_hard_coded_offsets()).
3254 // Use default fields allocation order for them.
3255 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3256 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3257 class_name == vmSymbols::java_lang_Class() ||
3258 class_name == vmSymbols::java_lang_ClassLoader() ||
3259 class_name == vmSymbols::java_lang_ref_Reference() ||
3260 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3261 class_name == vmSymbols::java_lang_StackTraceElement() ||
3262 class_name == vmSymbols::java_lang_String() ||
3263 class_name == vmSymbols::java_lang_Throwable() ||
3264 class_name == vmSymbols::java_lang_Boolean() ||
3265 class_name == vmSymbols::java_lang_Character() ||
3266 class_name == vmSymbols::java_lang_Float() ||
3267 class_name == vmSymbols::java_lang_Double() ||
3268 class_name == vmSymbols::java_lang_Byte() ||
3269 class_name == vmSymbols::java_lang_Short() ||
3270 class_name == vmSymbols::java_lang_Integer() ||
3271 class_name == vmSymbols::java_lang_Long())) {
3272 allocation_style = 0; // Allocate oops first
3273 compact_fields = false; // Don't compact fields
3274 }
3276 if( allocation_style == 0 ) {
3277 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3278 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3279 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3280 (nonstatic_oop_count * heapOopSize);
3281 } else if( allocation_style == 1 ) {
3282 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3283 next_nonstatic_double_offset = next_nonstatic_field_offset;
3284 } else if( allocation_style == 2 ) {
3285 // Fields allocation: oops fields in super and sub classes are together.
3286 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3287 super_klass->nonstatic_oop_map_size() > 0 ) {
3288 int map_size = super_klass->nonstatic_oop_map_size();
3289 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3290 OopMapBlock* last_map = first_map + map_size - 1;
3291 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3292 if (next_offset == next_nonstatic_field_offset) {
3293 allocation_style = 0; // allocate oops first
3294 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3295 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3296 (nonstatic_oop_count * heapOopSize);
3297 }
3298 }
3299 if( allocation_style == 2 ) {
3300 allocation_style = 1; // allocate oops last
3301 next_nonstatic_double_offset = next_nonstatic_field_offset;
3302 }
3303 } else {
3304 ShouldNotReachHere();
3305 }
3307 int nonstatic_oop_space_count = 0;
3308 int nonstatic_word_space_count = 0;
3309 int nonstatic_short_space_count = 0;
3310 int nonstatic_byte_space_count = 0;
3311 int nonstatic_oop_space_offset;
3312 int nonstatic_word_space_offset;
3313 int nonstatic_short_space_offset;
3314 int nonstatic_byte_space_offset;
3316 if( nonstatic_double_count > 0 ) {
3317 int offset = next_nonstatic_double_offset;
3318 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3319 if( compact_fields && offset != next_nonstatic_double_offset ) {
3320 // Allocate available fields into the gap before double field.
3321 int length = next_nonstatic_double_offset - offset;
3322 assert(length == BytesPerInt, "");
3323 nonstatic_word_space_offset = offset;
3324 if( nonstatic_word_count > 0 ) {
3325 nonstatic_word_count -= 1;
3326 nonstatic_word_space_count = 1; // Only one will fit
3327 length -= BytesPerInt;
3328 offset += BytesPerInt;
3329 }
3330 nonstatic_short_space_offset = offset;
3331 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3332 nonstatic_short_count -= 1;
3333 nonstatic_short_space_count += 1;
3334 length -= BytesPerShort;
3335 offset += BytesPerShort;
3336 }
3337 nonstatic_byte_space_offset = offset;
3338 while( length > 0 && nonstatic_byte_count > 0 ) {
3339 nonstatic_byte_count -= 1;
3340 nonstatic_byte_space_count += 1;
3341 length -= 1;
3342 }
3343 // Allocate oop field in the gap if there are no other fields for that.
3344 nonstatic_oop_space_offset = offset;
3345 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3346 allocation_style != 0 ) { // when oop fields not first
3347 nonstatic_oop_count -= 1;
3348 nonstatic_oop_space_count = 1; // Only one will fit
3349 length -= heapOopSize;
3350 offset += heapOopSize;
3351 }
3352 }
3353 }
3355 next_nonstatic_word_offset = next_nonstatic_double_offset +
3356 (nonstatic_double_count * BytesPerLong);
3357 next_nonstatic_short_offset = next_nonstatic_word_offset +
3358 (nonstatic_word_count * BytesPerInt);
3359 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3360 (nonstatic_short_count * BytesPerShort);
3362 int notaligned_offset;
3363 if( allocation_style == 0 ) {
3364 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3365 } else { // allocation_style == 1
3366 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3367 if( nonstatic_oop_count > 0 ) {
3368 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3369 }
3370 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3371 }
3372 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3373 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3374 - first_nonstatic_field_offset)/heapOopSize);
3376 // Iterate over fields again and compute correct offsets.
3377 // The field allocation type was temporarily stored in the offset slot.
3378 // oop fields are located before non-oop fields (static and non-static).
3379 int len = fields->length();
3380 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3381 int real_offset;
3382 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3383 switch (atype) {
3384 case STATIC_OOP:
3385 real_offset = next_static_oop_offset;
3386 next_static_oop_offset += heapOopSize;
3387 break;
3388 case STATIC_BYTE:
3389 real_offset = next_static_byte_offset;
3390 next_static_byte_offset += 1;
3391 break;
3392 case STATIC_SHORT:
3393 real_offset = next_static_short_offset;
3394 next_static_short_offset += BytesPerShort;
3395 break;
3396 case STATIC_WORD:
3397 real_offset = next_static_word_offset;
3398 next_static_word_offset += BytesPerInt;
3399 break;
3400 case STATIC_ALIGNED_DOUBLE:
3401 case STATIC_DOUBLE:
3402 real_offset = next_static_double_offset;
3403 next_static_double_offset += BytesPerLong;
3404 break;
3405 case NONSTATIC_OOP:
3406 if( nonstatic_oop_space_count > 0 ) {
3407 real_offset = nonstatic_oop_space_offset;
3408 nonstatic_oop_space_offset += heapOopSize;
3409 nonstatic_oop_space_count -= 1;
3410 } else {
3411 real_offset = next_nonstatic_oop_offset;
3412 next_nonstatic_oop_offset += heapOopSize;
3413 }
3414 // Update oop maps
3415 if( nonstatic_oop_map_count > 0 &&
3416 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3417 real_offset -
3418 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3419 heapOopSize ) {
3420 // Extend current oop map
3421 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3422 } else {
3423 // Create new oop map
3424 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3425 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3426 nonstatic_oop_map_count += 1;
3427 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3428 first_nonstatic_oop_offset = real_offset;
3429 }
3430 }
3431 break;
3432 case NONSTATIC_BYTE:
3433 if( nonstatic_byte_space_count > 0 ) {
3434 real_offset = nonstatic_byte_space_offset;
3435 nonstatic_byte_space_offset += 1;
3436 nonstatic_byte_space_count -= 1;
3437 } else {
3438 real_offset = next_nonstatic_byte_offset;
3439 next_nonstatic_byte_offset += 1;
3440 }
3441 break;
3442 case NONSTATIC_SHORT:
3443 if( nonstatic_short_space_count > 0 ) {
3444 real_offset = nonstatic_short_space_offset;
3445 nonstatic_short_space_offset += BytesPerShort;
3446 nonstatic_short_space_count -= 1;
3447 } else {
3448 real_offset = next_nonstatic_short_offset;
3449 next_nonstatic_short_offset += BytesPerShort;
3450 }
3451 break;
3452 case NONSTATIC_WORD:
3453 if( nonstatic_word_space_count > 0 ) {
3454 real_offset = nonstatic_word_space_offset;
3455 nonstatic_word_space_offset += BytesPerInt;
3456 nonstatic_word_space_count -= 1;
3457 } else {
3458 real_offset = next_nonstatic_word_offset;
3459 next_nonstatic_word_offset += BytesPerInt;
3460 }
3461 break;
3462 case NONSTATIC_ALIGNED_DOUBLE:
3463 case NONSTATIC_DOUBLE:
3464 real_offset = next_nonstatic_double_offset;
3465 next_nonstatic_double_offset += BytesPerLong;
3466 break;
3467 default:
3468 ShouldNotReachHere();
3469 }
3470 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3471 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3472 }
3474 // Size of instances
3475 int instance_size;
3477 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3478 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3480 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3482 // Number of non-static oop map blocks allocated at end of klass.
3483 const unsigned int total_oop_map_count =
3484 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3485 first_nonstatic_oop_offset);
3487 // Compute reference type
3488 ReferenceType rt;
3489 if (super_klass() == NULL) {
3490 rt = REF_NONE;
3491 } else {
3492 rt = super_klass->reference_type();
3493 }
3495 // We can now create the basic klassOop for this klass
3496 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3497 static_field_size,
3498 total_oop_map_count,
3499 rt, CHECK_(nullHandle));
3500 instanceKlassHandle this_klass (THREAD, ik);
3502 assert(this_klass->static_field_size() == static_field_size, "sanity");
3503 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3504 "sanity");
3506 // Fill in information already parsed
3507 this_klass->set_access_flags(access_flags);
3508 this_klass->set_should_verify_class(verify);
3509 jint lh = Klass::instance_layout_helper(instance_size, false);
3510 this_klass->set_layout_helper(lh);
3511 assert(this_klass->oop_is_instance(), "layout is correct");
3512 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3513 // Not yet: supers are done below to support the new subtype-checking fields
3514 //this_klass->set_super(super_klass());
3515 this_klass->set_class_loader(class_loader());
3516 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3517 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3518 this_klass->set_static_oop_field_count(fac.static_oop_count);
3519 cp->set_pool_holder(this_klass());
3520 error_handler.set_in_error(false); // turn off error handler for cp
3521 this_klass->set_constants(cp());
3522 this_klass->set_local_interfaces(local_interfaces());
3523 this_klass->set_fields(fields());
3524 this_klass->set_methods(methods());
3525 if (has_final_method) {
3526 this_klass->set_has_final_method();
3527 }
3528 this_klass->set_method_ordering(method_ordering());
3529 // The instanceKlass::_methods_jmethod_ids cache and the
3530 // instanceKlass::_methods_cached_itable_indices cache are
3531 // both managed on the assumption that the initial cache
3532 // size is equal to the number of methods in the class. If
3533 // that changes, then instanceKlass::idnum_can_increment()
3534 // has to be changed accordingly.
3535 this_klass->set_initial_method_idnum(methods->length());
3536 this_klass->set_name(cp->klass_name_at(this_class_index));
3537 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3538 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3539 this_klass->set_protection_domain(protection_domain());
3540 this_klass->set_fields_annotations(fields_annotations());
3541 this_klass->set_methods_annotations(methods_annotations());
3542 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3543 this_klass->set_methods_default_annotations(methods_default_annotations());
3545 this_klass->set_minor_version(minor_version);
3546 this_klass->set_major_version(major_version);
3548 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3549 // (We used to do this lazily, but now we query it in Rewriter,
3550 // which is eagerly done for every method, so we might as well do it now,
3551 // when everything is fresh in memory.)
3552 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3553 for (int j = 0; j < methods->length(); j++) {
3554 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3555 }
3556 }
3558 if (cached_class_file_bytes != NULL) {
3559 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3560 this_klass->set_cached_class_file(cached_class_file_bytes,
3561 cached_class_file_length);
3562 }
3564 // Miranda methods
3565 if ((num_miranda_methods > 0) ||
3566 // if this class introduced new miranda methods or
3567 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3568 // super class exists and this class inherited miranda methods
3569 ) {
3570 this_klass->set_has_miranda_methods(); // then set a flag
3571 }
3573 // Additional attributes
3574 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3576 // Make sure this is the end of class file stream
3577 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3579 // VerifyOops believes that once this has been set, the object is completely loaded.
3580 // Compute transitive closure of interfaces this class implements
3581 this_klass->set_transitive_interfaces(transitive_interfaces());
3583 // Fill in information needed to compute superclasses.
3584 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3586 // Initialize itable offset tables
3587 klassItable::setup_itable_offset_table(this_klass);
3589 // Do final class setup
3590 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3592 set_precomputed_flags(this_klass);
3594 // reinitialize modifiers, using the InnerClasses attribute
3595 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3596 this_klass->set_modifier_flags(computed_modifiers);
3598 // check if this class can access its super class
3599 check_super_class_access(this_klass, CHECK_(nullHandle));
3601 // check if this class can access its superinterfaces
3602 check_super_interface_access(this_klass, CHECK_(nullHandle));
3604 // check if this class overrides any final method
3605 check_final_method_override(this_klass, CHECK_(nullHandle));
3607 // check that if this class is an interface then it doesn't have static methods
3608 if (this_klass->is_interface()) {
3609 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3610 }
3612 // Allocate mirror and initialize static fields
3613 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3615 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3616 false /* not shared class */);
3618 if (TraceClassLoading) {
3619 // print in a single call to reduce interleaving of output
3620 if (cfs->source() != NULL) {
3621 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3622 cfs->source());
3623 } else if (class_loader.is_null()) {
3624 if (THREAD->is_Java_thread()) {
3625 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3626 tty->print("[Loaded %s by instance of %s]\n",
3627 this_klass->external_name(),
3628 instanceKlass::cast(caller)->external_name());
3629 } else {
3630 tty->print("[Loaded %s]\n", this_klass->external_name());
3631 }
3632 } else {
3633 ResourceMark rm;
3634 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3635 instanceKlass::cast(class_loader->klass())->external_name());
3636 }
3637 }
3639 if (TraceClassResolution) {
3640 // print out the superclass.
3641 const char * from = Klass::cast(this_klass())->external_name();
3642 if (this_klass->java_super() != NULL) {
3643 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3644 }
3645 // print out each of the interface classes referred to by this class.
3646 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3647 if (!local_interfaces.is_null()) {
3648 int length = local_interfaces->length();
3649 for (int i = 0; i < length; i++) {
3650 klassOop k = klassOop(local_interfaces->obj_at(i));
3651 instanceKlass* to_class = instanceKlass::cast(k);
3652 const char * to = to_class->external_name();
3653 tty->print("RESOLVE %s %s (interface)\n", from, to);
3654 }
3655 }
3656 }
3658 #ifndef PRODUCT
3659 if( PrintCompactFieldsSavings ) {
3660 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3661 tty->print("[Saved %d of %d bytes in %s]\n",
3662 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3663 orig_nonstatic_field_size*heapOopSize,
3664 this_klass->external_name());
3665 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3666 tty->print("[Wasted %d over %d bytes in %s]\n",
3667 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3668 orig_nonstatic_field_size*heapOopSize,
3669 this_klass->external_name());
3670 }
3671 }
3672 #endif
3674 // preserve result across HandleMark
3675 preserve_this_klass = this_klass();
3676 }
3678 // Create new handle outside HandleMark
3679 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3680 debug_only(this_klass->as_klassOop()->verify();)
3682 return this_klass;
3683 }
3686 unsigned int
3687 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3688 unsigned int nonstatic_oop_map_count,
3689 int first_nonstatic_oop_offset) {
3690 unsigned int map_count =
3691 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3692 if (nonstatic_oop_map_count > 0) {
3693 // We have oops to add to map
3694 if (map_count == 0) {
3695 map_count = nonstatic_oop_map_count;
3696 } else {
3697 // Check whether we should add a new map block or whether the last one can
3698 // be extended
3699 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3700 OopMapBlock* const last_map = first_map + map_count - 1;
3702 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3703 if (next_offset == first_nonstatic_oop_offset) {
3704 // There is no gap bettwen superklass's last oop field and first
3705 // local oop field, merge maps.
3706 nonstatic_oop_map_count -= 1;
3707 } else {
3708 // Superklass didn't end with a oop field, add extra maps
3709 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3710 }
3711 map_count += nonstatic_oop_map_count;
3712 }
3713 }
3714 return map_count;
3715 }
3718 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3719 unsigned int nonstatic_oop_map_count,
3720 int* nonstatic_oop_offsets,
3721 unsigned int* nonstatic_oop_counts) {
3722 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3723 const instanceKlass* const super = k->superklass();
3724 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3725 if (super_count > 0) {
3726 // Copy maps from superklass
3727 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3728 for (unsigned int i = 0; i < super_count; ++i) {
3729 *this_oop_map++ = *super_oop_map++;
3730 }
3731 }
3733 if (nonstatic_oop_map_count > 0) {
3734 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3735 // The counts differ because there is no gap between superklass's last oop
3736 // field and the first local oop field. Extend the last oop map copied
3737 // from the superklass instead of creating new one.
3738 nonstatic_oop_map_count--;
3739 nonstatic_oop_offsets++;
3740 this_oop_map--;
3741 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3742 this_oop_map++;
3743 }
3745 // Add new map blocks, fill them
3746 while (nonstatic_oop_map_count-- > 0) {
3747 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3748 this_oop_map->set_count(*nonstatic_oop_counts++);
3749 this_oop_map++;
3750 }
3751 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3752 this_oop_map, "sanity");
3753 }
3754 }
3757 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3758 klassOop super = k->super();
3760 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3761 // in which case we don't have to register objects as finalizable
3762 if (!_has_empty_finalizer) {
3763 if (_has_finalizer ||
3764 (super != NULL && super->klass_part()->has_finalizer())) {
3765 k->set_has_finalizer();
3766 }
3767 }
3769 #ifdef ASSERT
3770 bool f = false;
3771 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3772 vmSymbols::void_method_signature());
3773 if (m != NULL && !m->is_empty_method()) {
3774 f = true;
3775 }
3776 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3777 #endif
3779 // Check if this klass supports the java.lang.Cloneable interface
3780 if (SystemDictionary::Cloneable_klass_loaded()) {
3781 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3782 k->set_is_cloneable();
3783 }
3784 }
3786 // Check if this klass has a vanilla default constructor
3787 if (super == NULL) {
3788 // java.lang.Object has empty default constructor
3789 k->set_has_vanilla_constructor();
3790 } else {
3791 if (Klass::cast(super)->has_vanilla_constructor() &&
3792 _has_vanilla_constructor) {
3793 k->set_has_vanilla_constructor();
3794 }
3795 #ifdef ASSERT
3796 bool v = false;
3797 if (Klass::cast(super)->has_vanilla_constructor()) {
3798 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3799 ), vmSymbols::void_method_signature());
3800 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3801 v = true;
3802 }
3803 }
3804 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3805 #endif
3806 }
3808 // If it cannot be fast-path allocated, set a bit in the layout helper.
3809 // See documentation of instanceKlass::can_be_fastpath_allocated().
3810 assert(k->size_helper() > 0, "layout_helper is initialized");
3811 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3812 || k->is_abstract() || k->is_interface()
3813 || (k->name() == vmSymbols::java_lang_Class()
3814 && k->class_loader() == NULL)
3815 || k->size_helper() >= FastAllocateSizeLimit) {
3816 // Forbid fast-path allocation.
3817 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3818 k->set_layout_helper(lh);
3819 }
3820 }
3823 // utility method for appending and array with check for duplicates
3825 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3826 // iterate over new interfaces
3827 for (int i = 0; i < ifs->length(); i++) {
3828 oop e = ifs->obj_at(i);
3829 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3830 // check for duplicates
3831 bool duplicate = false;
3832 for (int j = 0; j < index; j++) {
3833 if (result->obj_at(j) == e) {
3834 duplicate = true;
3835 break;
3836 }
3837 }
3838 // add new interface
3839 if (!duplicate) {
3840 result->obj_at_put(index++, e);
3841 }
3842 }
3843 }
3845 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3846 // Compute maximum size for transitive interfaces
3847 int max_transitive_size = 0;
3848 int super_size = 0;
3849 // Add superclass transitive interfaces size
3850 if (super.not_null()) {
3851 super_size = super->transitive_interfaces()->length();
3852 max_transitive_size += super_size;
3853 }
3854 // Add local interfaces' super interfaces
3855 int local_size = local_ifs->length();
3856 for (int i = 0; i < local_size; i++) {
3857 klassOop l = klassOop(local_ifs->obj_at(i));
3858 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3859 }
3860 // Finally add local interfaces
3861 max_transitive_size += local_size;
3862 // Construct array
3863 objArrayHandle result;
3864 if (max_transitive_size == 0) {
3865 // no interfaces, use canonicalized array
3866 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3867 } else if (max_transitive_size == super_size) {
3868 // no new local interfaces added, share superklass' transitive interface array
3869 result = objArrayHandle(THREAD, super->transitive_interfaces());
3870 } else if (max_transitive_size == local_size) {
3871 // only local interfaces added, share local interface array
3872 result = local_ifs;
3873 } else {
3874 objArrayHandle nullHandle;
3875 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3876 result = objArrayHandle(THREAD, new_objarray);
3877 int index = 0;
3878 // Copy down from superclass
3879 if (super.not_null()) {
3880 append_interfaces(result, index, super->transitive_interfaces());
3881 }
3882 // Copy down from local interfaces' superinterfaces
3883 for (int i = 0; i < local_ifs->length(); i++) {
3884 klassOop l = klassOop(local_ifs->obj_at(i));
3885 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3886 }
3887 // Finally add local interfaces
3888 append_interfaces(result, index, local_ifs());
3890 // Check if duplicates were removed
3891 if (index != max_transitive_size) {
3892 assert(index < max_transitive_size, "just checking");
3893 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3894 for (int i = 0; i < index; i++) {
3895 oop e = result->obj_at(i);
3896 assert(e != NULL, "just checking");
3897 new_result->obj_at_put(i, e);
3898 }
3899 result = objArrayHandle(THREAD, new_result);
3900 }
3901 }
3902 return result;
3903 }
3906 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3907 klassOop super = this_klass->super();
3908 if ((super != NULL) &&
3909 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3910 ResourceMark rm(THREAD);
3911 Exceptions::fthrow(
3912 THREAD_AND_LOCATION,
3913 vmSymbols::java_lang_IllegalAccessError(),
3914 "class %s cannot access its superclass %s",
3915 this_klass->external_name(),
3916 instanceKlass::cast(super)->external_name()
3917 );
3918 return;
3919 }
3920 }
3923 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3924 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3925 int lng = local_interfaces->length();
3926 for (int i = lng - 1; i >= 0; i--) {
3927 klassOop k = klassOop(local_interfaces->obj_at(i));
3928 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3929 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3930 ResourceMark rm(THREAD);
3931 Exceptions::fthrow(
3932 THREAD_AND_LOCATION,
3933 vmSymbols::java_lang_IllegalAccessError(),
3934 "class %s cannot access its superinterface %s",
3935 this_klass->external_name(),
3936 instanceKlass::cast(k)->external_name()
3937 );
3938 return;
3939 }
3940 }
3941 }
3944 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3945 objArrayHandle methods (THREAD, this_klass->methods());
3946 int num_methods = methods->length();
3948 // go thru each method and check if it overrides a final method
3949 for (int index = 0; index < num_methods; index++) {
3950 methodOop m = (methodOop)methods->obj_at(index);
3952 // skip private, static and <init> methods
3953 if ((!m->is_private()) &&
3954 (!m->is_static()) &&
3955 (m->name() != vmSymbols::object_initializer_name())) {
3957 Symbol* name = m->name();
3958 Symbol* signature = m->signature();
3959 klassOop k = this_klass->super();
3960 methodOop super_m = NULL;
3961 while (k != NULL) {
3962 // skip supers that don't have final methods.
3963 if (k->klass_part()->has_final_method()) {
3964 // lookup a matching method in the super class hierarchy
3965 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3966 if (super_m == NULL) {
3967 break; // didn't find any match; get out
3968 }
3970 if (super_m->is_final() &&
3971 // matching method in super is final
3972 (Reflection::verify_field_access(this_klass->as_klassOop(),
3973 super_m->method_holder(),
3974 super_m->method_holder(),
3975 super_m->access_flags(), false))
3976 // this class can access super final method and therefore override
3977 ) {
3978 ResourceMark rm(THREAD);
3979 Exceptions::fthrow(
3980 THREAD_AND_LOCATION,
3981 vmSymbols::java_lang_VerifyError(),
3982 "class %s overrides final method %s.%s",
3983 this_klass->external_name(),
3984 name->as_C_string(),
3985 signature->as_C_string()
3986 );
3987 return;
3988 }
3990 // continue to look from super_m's holder's super.
3991 k = instanceKlass::cast(super_m->method_holder())->super();
3992 continue;
3993 }
3995 k = k->klass_part()->super();
3996 }
3997 }
3998 }
3999 }
4002 // assumes that this_klass is an interface
4003 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4004 assert(this_klass->is_interface(), "not an interface");
4005 objArrayHandle methods (THREAD, this_klass->methods());
4006 int num_methods = methods->length();
4008 for (int index = 0; index < num_methods; index++) {
4009 methodOop m = (methodOop)methods->obj_at(index);
4010 // if m is static and not the init method, throw a verify error
4011 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4012 ResourceMark rm(THREAD);
4013 Exceptions::fthrow(
4014 THREAD_AND_LOCATION,
4015 vmSymbols::java_lang_VerifyError(),
4016 "Illegal static method %s in interface %s",
4017 m->name()->as_C_string(),
4018 this_klass->external_name()
4019 );
4020 return;
4021 }
4022 }
4023 }
4025 // utility methods for format checking
4027 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4028 if (!_need_verify) { return; }
4030 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4031 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4032 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4033 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4034 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4035 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4036 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4038 if ((is_abstract && is_final) ||
4039 (is_interface && !is_abstract) ||
4040 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4041 (!is_interface && major_gte_15 && is_annotation)) {
4042 ResourceMark rm(THREAD);
4043 Exceptions::fthrow(
4044 THREAD_AND_LOCATION,
4045 vmSymbols::java_lang_ClassFormatError(),
4046 "Illegal class modifiers in class %s: 0x%X",
4047 _class_name->as_C_string(), flags
4048 );
4049 return;
4050 }
4051 }
4053 bool ClassFileParser::has_illegal_visibility(jint flags) {
4054 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4055 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4056 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4058 return ((is_public && is_protected) ||
4059 (is_public && is_private) ||
4060 (is_protected && is_private));
4061 }
4063 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4064 u2 max_version =
4065 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4066 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4067 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4068 (major <= max_version) &&
4069 ((major != max_version) ||
4070 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4071 }
4073 void ClassFileParser::verify_legal_field_modifiers(
4074 jint flags, bool is_interface, TRAPS) {
4075 if (!_need_verify) { return; }
4077 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4078 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4079 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4080 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4081 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4082 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4083 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4084 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4085 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4087 bool is_illegal = false;
4089 if (is_interface) {
4090 if (!is_public || !is_static || !is_final || is_private ||
4091 is_protected || is_volatile || is_transient ||
4092 (major_gte_15 && is_enum)) {
4093 is_illegal = true;
4094 }
4095 } else { // not interface
4096 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4097 is_illegal = true;
4098 }
4099 }
4101 if (is_illegal) {
4102 ResourceMark rm(THREAD);
4103 Exceptions::fthrow(
4104 THREAD_AND_LOCATION,
4105 vmSymbols::java_lang_ClassFormatError(),
4106 "Illegal field modifiers in class %s: 0x%X",
4107 _class_name->as_C_string(), flags);
4108 return;
4109 }
4110 }
4112 void ClassFileParser::verify_legal_method_modifiers(
4113 jint flags, bool is_interface, Symbol* name, TRAPS) {
4114 if (!_need_verify) { return; }
4116 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4117 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4118 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4119 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4120 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4121 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4122 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4123 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4124 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4125 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4126 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4128 bool is_illegal = false;
4130 if (is_interface) {
4131 if (!is_abstract || !is_public || is_static || is_final ||
4132 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4133 is_illegal = true;
4134 }
4135 } else { // not interface
4136 if (is_initializer) {
4137 if (is_static || is_final || is_synchronized || is_native ||
4138 is_abstract || (major_gte_15 && is_bridge)) {
4139 is_illegal = true;
4140 }
4141 } else { // not initializer
4142 if (is_abstract) {
4143 if ((is_final || is_native || is_private || is_static ||
4144 (major_gte_15 && (is_synchronized || is_strict)))) {
4145 is_illegal = true;
4146 }
4147 }
4148 if (has_illegal_visibility(flags)) {
4149 is_illegal = true;
4150 }
4151 }
4152 }
4154 if (is_illegal) {
4155 ResourceMark rm(THREAD);
4156 Exceptions::fthrow(
4157 THREAD_AND_LOCATION,
4158 vmSymbols::java_lang_ClassFormatError(),
4159 "Method %s in class %s has illegal modifiers: 0x%X",
4160 name->as_C_string(), _class_name->as_C_string(), flags);
4161 return;
4162 }
4163 }
4165 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4166 assert(_need_verify, "only called when _need_verify is true");
4167 int i = 0;
4168 int count = length >> 2;
4169 for (int k=0; k<count; k++) {
4170 unsigned char b0 = buffer[i];
4171 unsigned char b1 = buffer[i+1];
4172 unsigned char b2 = buffer[i+2];
4173 unsigned char b3 = buffer[i+3];
4174 // For an unsigned char v,
4175 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4176 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4177 unsigned char res = b0 | b0 - 1 |
4178 b1 | b1 - 1 |
4179 b2 | b2 - 1 |
4180 b3 | b3 - 1;
4181 if (res >= 128) break;
4182 i += 4;
4183 }
4184 for(; i < length; i++) {
4185 unsigned short c;
4186 // no embedded zeros
4187 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4188 if(buffer[i] < 128) {
4189 continue;
4190 }
4191 if ((i + 5) < length) { // see if it's legal supplementary character
4192 if (UTF8::is_supplementary_character(&buffer[i])) {
4193 c = UTF8::get_supplementary_character(&buffer[i]);
4194 i += 5;
4195 continue;
4196 }
4197 }
4198 switch (buffer[i] >> 4) {
4199 default: break;
4200 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4201 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4202 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4203 c = (buffer[i] & 0x1F) << 6;
4204 i++;
4205 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4206 c += buffer[i] & 0x3F;
4207 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4208 // for classes with major > 47, c must a null or a character in its shortest form
4209 break;
4210 }
4211 }
4212 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4213 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4214 c = (buffer[i] & 0xF) << 12;
4215 i += 2;
4216 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4217 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4218 if (_major_version <= 47 || c >= 0x800) {
4219 // for classes with major > 47, c must be in its shortest form
4220 break;
4221 }
4222 }
4223 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4224 } // end of switch
4225 } // end of for
4226 }
4228 // Checks if name is a legal class name.
4229 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4230 if (!_need_verify || _relax_verify) { return; }
4232 char buf[fixed_buffer_size];
4233 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4234 unsigned int length = name->utf8_length();
4235 bool legal = false;
4237 if (length > 0) {
4238 char* p;
4239 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4240 p = skip_over_field_signature(bytes, false, length, CHECK);
4241 legal = (p != NULL) && ((p - bytes) == (int)length);
4242 } else if (_major_version < JAVA_1_5_VERSION) {
4243 if (bytes[0] != '<') {
4244 p = skip_over_field_name(bytes, true, length);
4245 legal = (p != NULL) && ((p - bytes) == (int)length);
4246 }
4247 } else {
4248 // 4900761: relax the constraints based on JSR202 spec
4249 // Class names may be drawn from the entire Unicode character set.
4250 // Identifiers between '/' must be unqualified names.
4251 // The utf8 string has been verified when parsing cpool entries.
4252 legal = verify_unqualified_name(bytes, length, LegalClass);
4253 }
4254 }
4255 if (!legal) {
4256 ResourceMark rm(THREAD);
4257 Exceptions::fthrow(
4258 THREAD_AND_LOCATION,
4259 vmSymbols::java_lang_ClassFormatError(),
4260 "Illegal class name \"%s\" in class file %s", bytes,
4261 _class_name->as_C_string()
4262 );
4263 return;
4264 }
4265 }
4267 // Checks if name is a legal field name.
4268 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4269 if (!_need_verify || _relax_verify) { return; }
4271 char buf[fixed_buffer_size];
4272 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4273 unsigned int length = name->utf8_length();
4274 bool legal = false;
4276 if (length > 0) {
4277 if (_major_version < JAVA_1_5_VERSION) {
4278 if (bytes[0] != '<') {
4279 char* p = skip_over_field_name(bytes, false, length);
4280 legal = (p != NULL) && ((p - bytes) == (int)length);
4281 }
4282 } else {
4283 // 4881221: relax the constraints based on JSR202 spec
4284 legal = verify_unqualified_name(bytes, length, LegalField);
4285 }
4286 }
4288 if (!legal) {
4289 ResourceMark rm(THREAD);
4290 Exceptions::fthrow(
4291 THREAD_AND_LOCATION,
4292 vmSymbols::java_lang_ClassFormatError(),
4293 "Illegal field name \"%s\" in class %s", bytes,
4294 _class_name->as_C_string()
4295 );
4296 return;
4297 }
4298 }
4300 // Checks if name is a legal method name.
4301 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4302 if (!_need_verify || _relax_verify) { return; }
4304 assert(name != NULL, "method name is null");
4305 char buf[fixed_buffer_size];
4306 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4307 unsigned int length = name->utf8_length();
4308 bool legal = false;
4310 if (length > 0) {
4311 if (bytes[0] == '<') {
4312 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4313 legal = true;
4314 }
4315 } else if (_major_version < JAVA_1_5_VERSION) {
4316 char* p;
4317 p = skip_over_field_name(bytes, false, length);
4318 legal = (p != NULL) && ((p - bytes) == (int)length);
4319 } else {
4320 // 4881221: relax the constraints based on JSR202 spec
4321 legal = verify_unqualified_name(bytes, length, LegalMethod);
4322 }
4323 }
4325 if (!legal) {
4326 ResourceMark rm(THREAD);
4327 Exceptions::fthrow(
4328 THREAD_AND_LOCATION,
4329 vmSymbols::java_lang_ClassFormatError(),
4330 "Illegal method name \"%s\" in class %s", bytes,
4331 _class_name->as_C_string()
4332 );
4333 return;
4334 }
4335 }
4338 // Checks if signature is a legal field signature.
4339 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4340 if (!_need_verify) { return; }
4342 char buf[fixed_buffer_size];
4343 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4344 unsigned int length = signature->utf8_length();
4345 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4347 if (p == NULL || (p - bytes) != (int)length) {
4348 throwIllegalSignature("Field", name, signature, CHECK);
4349 }
4350 }
4352 // Checks if signature is a legal method signature.
4353 // Returns number of parameters
4354 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4355 if (!_need_verify) {
4356 // make sure caller's args_size will be less than 0 even for non-static
4357 // method so it will be recomputed in compute_size_of_parameters().
4358 return -2;
4359 }
4361 unsigned int args_size = 0;
4362 char buf[fixed_buffer_size];
4363 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4364 unsigned int length = signature->utf8_length();
4365 char* nextp;
4367 // The first character must be a '('
4368 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4369 length--;
4370 // Skip over legal field signatures
4371 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4372 while ((length > 0) && (nextp != NULL)) {
4373 args_size++;
4374 if (p[0] == 'J' || p[0] == 'D') {
4375 args_size++;
4376 }
4377 length -= nextp - p;
4378 p = nextp;
4379 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4380 }
4381 // The first non-signature thing better be a ')'
4382 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4383 length--;
4384 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4385 // All internal methods must return void
4386 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4387 return args_size;
4388 }
4389 } else {
4390 // Now we better just have a return value
4391 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4392 if (nextp && ((int)length == (nextp - p))) {
4393 return args_size;
4394 }
4395 }
4396 }
4397 }
4398 // Report error
4399 throwIllegalSignature("Method", name, signature, CHECK_0);
4400 return 0;
4401 }
4404 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4405 // Method names also may not contain the characters '<' or '>', unless <init>
4406 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4407 // method. Because these names have been checked as special cases before
4408 // calling this method in verify_legal_method_name.
4409 bool ClassFileParser::verify_unqualified_name(
4410 char* name, unsigned int length, int type) {
4411 jchar ch;
4413 for (char* p = name; p != name + length; ) {
4414 ch = *p;
4415 if (ch < 128) {
4416 p++;
4417 if (ch == '.' || ch == ';' || ch == '[' ) {
4418 return false; // do not permit '.', ';', or '['
4419 }
4420 if (type != LegalClass && ch == '/') {
4421 return false; // do not permit '/' unless it's class name
4422 }
4423 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4424 return false; // do not permit '<' or '>' in method names
4425 }
4426 } else {
4427 char* tmp_p = UTF8::next(p, &ch);
4428 p = tmp_p;
4429 }
4430 }
4431 return true;
4432 }
4435 // Take pointer to a string. Skip over the longest part of the string that could
4436 // be taken as a fieldname. Allow '/' if slash_ok is true.
4437 // Return a pointer to just past the fieldname.
4438 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4439 // being true, we saw consecutive slashes (meaning we were looking for a
4440 // qualified path but found something that was badly-formed).
4441 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4442 char* p;
4443 jchar ch;
4444 jboolean last_is_slash = false;
4445 jboolean not_first_ch = false;
4447 for (p = name; p != name + length; not_first_ch = true) {
4448 char* old_p = p;
4449 ch = *p;
4450 if (ch < 128) {
4451 p++;
4452 // quick check for ascii
4453 if ((ch >= 'a' && ch <= 'z') ||
4454 (ch >= 'A' && ch <= 'Z') ||
4455 (ch == '_' || ch == '$') ||
4456 (not_first_ch && ch >= '0' && ch <= '9')) {
4457 last_is_slash = false;
4458 continue;
4459 }
4460 if (slash_ok && ch == '/') {
4461 if (last_is_slash) {
4462 return NULL; // Don't permit consecutive slashes
4463 }
4464 last_is_slash = true;
4465 continue;
4466 }
4467 } else {
4468 jint unicode_ch;
4469 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4470 p = tmp_p;
4471 last_is_slash = false;
4472 // Check if ch is Java identifier start or is Java identifier part
4473 // 4672820: call java.lang.Character methods directly without generating separate tables.
4474 EXCEPTION_MARK;
4475 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4477 // return value
4478 JavaValue result(T_BOOLEAN);
4479 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4480 JavaCallArguments args;
4481 args.push_int(unicode_ch);
4483 // public static boolean isJavaIdentifierStart(char ch);
4484 JavaCalls::call_static(&result,
4485 klass,
4486 vmSymbols::isJavaIdentifierStart_name(),
4487 vmSymbols::int_bool_signature(),
4488 &args,
4489 THREAD);
4491 if (HAS_PENDING_EXCEPTION) {
4492 CLEAR_PENDING_EXCEPTION;
4493 return 0;
4494 }
4495 if (result.get_jboolean()) {
4496 continue;
4497 }
4499 if (not_first_ch) {
4500 // public static boolean isJavaIdentifierPart(char ch);
4501 JavaCalls::call_static(&result,
4502 klass,
4503 vmSymbols::isJavaIdentifierPart_name(),
4504 vmSymbols::int_bool_signature(),
4505 &args,
4506 THREAD);
4508 if (HAS_PENDING_EXCEPTION) {
4509 CLEAR_PENDING_EXCEPTION;
4510 return 0;
4511 }
4513 if (result.get_jboolean()) {
4514 continue;
4515 }
4516 }
4517 }
4518 return (not_first_ch) ? old_p : NULL;
4519 }
4520 return (not_first_ch) ? p : NULL;
4521 }
4524 // Take pointer to a string. Skip over the longest part of the string that could
4525 // be taken as a field signature. Allow "void" if void_ok.
4526 // Return a pointer to just past the signature.
4527 // Return NULL if no legal signature is found.
4528 char* ClassFileParser::skip_over_field_signature(char* signature,
4529 bool void_ok,
4530 unsigned int length,
4531 TRAPS) {
4532 unsigned int array_dim = 0;
4533 while (length > 0) {
4534 switch (signature[0]) {
4535 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4536 case JVM_SIGNATURE_BOOLEAN:
4537 case JVM_SIGNATURE_BYTE:
4538 case JVM_SIGNATURE_CHAR:
4539 case JVM_SIGNATURE_SHORT:
4540 case JVM_SIGNATURE_INT:
4541 case JVM_SIGNATURE_FLOAT:
4542 case JVM_SIGNATURE_LONG:
4543 case JVM_SIGNATURE_DOUBLE:
4544 return signature + 1;
4545 case JVM_SIGNATURE_CLASS: {
4546 if (_major_version < JAVA_1_5_VERSION) {
4547 // Skip over the class name if one is there
4548 char* p = skip_over_field_name(signature + 1, true, --length);
4550 // The next character better be a semicolon
4551 if (p && (p - signature) > 1 && p[0] == ';') {
4552 return p + 1;
4553 }
4554 } else {
4555 // 4900761: For class version > 48, any unicode is allowed in class name.
4556 length--;
4557 signature++;
4558 while (length > 0 && signature[0] != ';') {
4559 if (signature[0] == '.') {
4560 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4561 }
4562 length--;
4563 signature++;
4564 }
4565 if (signature[0] == ';') { return signature + 1; }
4566 }
4568 return NULL;
4569 }
4570 case JVM_SIGNATURE_ARRAY:
4571 array_dim++;
4572 if (array_dim > 255) {
4573 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4574 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4575 }
4576 // The rest of what's there better be a legal signature
4577 signature++;
4578 length--;
4579 void_ok = false;
4580 break;
4582 default:
4583 return NULL;
4584 }
4585 }
4586 return NULL;
4587 }