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 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/verificationType.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPoolOop.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/klassOop.hpp"
42 #include "oops/klassVtable.hpp"
43 #include "oops/methodOop.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/perfData.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/timer.hpp"
51 #include "services/classLoadingService.hpp"
52 #include "services/threadService.hpp"
53
54 // We generally try to create the oops directly when parsing, rather than
55 // allocating temporary data structures and copying the bytes twice. A
56 // temporary area is only needed when parsing utf8 entries in the constant
57 // pool and when parsing line number tables.
58
59 // We add assert in debug mode when class format is not checked.
60
61 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
62 #define JAVA_MIN_SUPPORTED_VERSION 45
63 #define JAVA_MAX_SUPPORTED_VERSION 51
64 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
65
66 // Used for two backward compatibility reasons:
67 // - to check for new additions to the class file format in JDK1.5
68 // - to check for bug fixes in the format checker in JDK1.5
69 #define JAVA_1_5_VERSION 49
70
71 // Used for backward compatibility reasons:
72 // - to check for javac bug fixes that happened after 1.5
73 // - also used as the max version when running in jdk6
74 #define JAVA_6_VERSION 50
75
76 // Used for backward compatibility reasons:
77 // - to check NameAndType_info signatures more aggressively
78 #define JAVA_7_VERSION 51
79
80
81 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
82 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
83 // this function (_current can be allocated in a register, with scalar
84 // replacement of aggregates). The _current pointer is copied back to
85 // stream() when this function returns. DON'T call another method within
86 // this method that uses stream().
87 ClassFileStream* cfs0 = stream();
88 ClassFileStream cfs1 = *cfs0;
89 ClassFileStream* cfs = &cfs1;
90 #ifdef ASSERT
91 assert(cfs->allocated_on_stack(),"should be local");
92 u1* old_current = cfs0->current();
93 #endif
94
95 // Used for batching symbol allocations.
96 const char* names[SymbolTable::symbol_alloc_batch_size];
97 int lengths[SymbolTable::symbol_alloc_batch_size];
98 int indices[SymbolTable::symbol_alloc_batch_size];
99 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
100 int names_count = 0;
101
102 // parsing Index 0 is unused
103 for (int index = 1; index < length; index++) {
104 // Each of the following case guarantees one more byte in the stream
105 // for the following tag or the access_flags following constant pool,
106 // so we don't need bounds-check for reading tag.
107 u1 tag = cfs->get_u1_fast();
108 switch (tag) {
109 case JVM_CONSTANT_Class :
110 {
111 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
112 u2 name_index = cfs->get_u2_fast();
113 cp->klass_index_at_put(index, name_index);
114 }
115 break;
116 case JVM_CONSTANT_Fieldref :
117 {
118 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
119 u2 class_index = cfs->get_u2_fast();
120 u2 name_and_type_index = cfs->get_u2_fast();
121 cp->field_at_put(index, class_index, name_and_type_index);
122 }
123 break;
124 case JVM_CONSTANT_Methodref :
125 {
126 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
127 u2 class_index = cfs->get_u2_fast();
128 u2 name_and_type_index = cfs->get_u2_fast();
129 cp->method_at_put(index, class_index, name_and_type_index);
130 }
131 break;
132 case JVM_CONSTANT_InterfaceMethodref :
133 {
134 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
135 u2 class_index = cfs->get_u2_fast();
136 u2 name_and_type_index = cfs->get_u2_fast();
137 cp->interface_method_at_put(index, class_index, name_and_type_index);
138 }
139 break;
140 case JVM_CONSTANT_String :
141 {
142 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
143 u2 string_index = cfs->get_u2_fast();
144 cp->string_index_at_put(index, string_index);
145 }
146 break;
147 case JVM_CONSTANT_MethodHandle :
148 case JVM_CONSTANT_MethodType :
149 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
150 classfile_parse_error(
151 "Class file version does not support constant tag %u in class file %s",
152 tag, CHECK);
153 }
154 if (!EnableMethodHandles) {
155 classfile_parse_error(
156 "This JVM does not support constant tag %u in class file %s",
157 tag, CHECK);
158 }
159 if (tag == JVM_CONSTANT_MethodHandle) {
160 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
161 u1 ref_kind = cfs->get_u1_fast();
162 u2 method_index = cfs->get_u2_fast();
163 cp->method_handle_index_at_put(index, ref_kind, method_index);
164 } else if (tag == JVM_CONSTANT_MethodType) {
165 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
166 u2 signature_index = cfs->get_u2_fast();
167 cp->method_type_index_at_put(index, signature_index);
168 } else {
169 ShouldNotReachHere();
170 }
171 break;
172 case JVM_CONSTANT_InvokeDynamicTrans : // this tag appears only in old classfiles
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 (tag == JVM_CONSTANT_InvokeDynamicTrans) {
189 if (!AllowTransitionalJSR292)
190 classfile_parse_error(
191 "This JVM does not support transitional InvokeDynamic tag %u in class file %s",
192 tag, CHECK);
193 cp->invoke_dynamic_trans_at_put(index, bootstrap_specifier_index, name_and_type_index);
194 break;
195 }
196 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
197 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
198 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
199 }
200 break;
201 case JVM_CONSTANT_Integer :
202 {
203 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
204 u4 bytes = cfs->get_u4_fast();
205 cp->int_at_put(index, (jint) bytes);
206 }
207 break;
208 case JVM_CONSTANT_Float :
209 {
210 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
211 u4 bytes = cfs->get_u4_fast();
212 cp->float_at_put(index, *(jfloat*)&bytes);
213 }
214 break;
215 case JVM_CONSTANT_Long :
216 // A mangled type might cause you to overrun allocated memory
217 guarantee_property(index+1 < length,
218 "Invalid constant pool entry %u in class file %s",
219 index, CHECK);
220 {
221 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
222 u8 bytes = cfs->get_u8_fast();
223 cp->long_at_put(index, bytes);
224 }
225 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
226 break;
227 case JVM_CONSTANT_Double :
228 // A mangled type might cause you to overrun allocated memory
229 guarantee_property(index+1 < length,
230 "Invalid constant pool entry %u in class file %s",
231 index, CHECK);
232 {
233 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
234 u8 bytes = cfs->get_u8_fast();
235 cp->double_at_put(index, *(jdouble*)&bytes);
236 }
237 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
238 break;
239 case JVM_CONSTANT_NameAndType :
240 {
241 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
242 u2 name_index = cfs->get_u2_fast();
243 u2 signature_index = cfs->get_u2_fast();
244 cp->name_and_type_at_put(index, name_index, signature_index);
245 }
246 break;
247 case JVM_CONSTANT_Utf8 :
248 {
249 cfs->guarantee_more(2, CHECK); // utf8_length
250 u2 utf8_length = cfs->get_u2_fast();
251 u1* utf8_buffer = cfs->get_u1_buffer();
252 assert(utf8_buffer != NULL, "null utf8 buffer");
253 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
254 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
255 cfs->skip_u1_fast(utf8_length);
256
257 // Before storing the symbol, make sure it's legal
258 if (_need_verify) {
259 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
260 }
261
262 if (AnonymousClasses && has_cp_patch_at(index)) {
263 Handle patch = clear_cp_patch_at(index);
264 guarantee_property(java_lang_String::is_instance(patch()),
265 "Illegal utf8 patch at %d in class file %s",
266 index, CHECK);
267 char* str = java_lang_String::as_utf8_string(patch());
268 // (could use java_lang_String::as_symbol instead, but might as well batch them)
269 utf8_buffer = (u1*) str;
270 utf8_length = (int) strlen(str);
271 }
272
273 unsigned int hash;
274 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
275 if (result == NULL) {
276 names[names_count] = (char*)utf8_buffer;
277 lengths[names_count] = utf8_length;
278 indices[names_count] = index;
279 hashValues[names_count++] = hash;
280 if (names_count == SymbolTable::symbol_alloc_batch_size) {
281 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
282 names_count = 0;
283 }
284 } else {
285 cp->symbol_at_put(index, result);
286 }
287 }
288 break;
289 default:
290 classfile_parse_error(
291 "Unknown constant tag %u in class file %s", tag, CHECK);
292 break;
293 }
294 }
295
296 // Allocate the remaining symbols
297 if (names_count > 0) {
298 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
299 }
300
301 // Copy _current pointer of local copy back to stream().
302 #ifdef ASSERT
303 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
304 #endif
305 cfs0->set_current(cfs1.current());
306 }
307
308 // This class unreferences constant pool symbols if an error has occurred
309 // while parsing the class before it is assigned into the class.
310 // If it gets an error after that it is unloaded and the constant pool will
311 // be cleaned up then.
312 class ConstantPoolCleaner : public StackObj {
313 constantPoolHandle _cphandle;
314 bool _in_error;
315 public:
316 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
317 ~ConstantPoolCleaner() {
318 if (_in_error && _cphandle.not_null()) {
319 _cphandle->unreference_symbols();
320 }
321 }
322 void set_in_error(bool clean) { _in_error = clean; }
323 };
324
325 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
326
327 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
328 ClassFileStream* cfs = stream();
329 constantPoolHandle nullHandle;
330
331 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
332 u2 length = cfs->get_u2_fast();
333 guarantee_property(
334 length >= 1, "Illegal constant pool size %u in class file %s",
335 length, CHECK_(nullHandle));
336 constantPoolOop constant_pool =
337 oopFactory::new_constantPool(length,
338 oopDesc::IsSafeConc,
339 CHECK_(nullHandle));
340 constantPoolHandle cp (THREAD, constant_pool);
341
342 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
343 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
344
345 // parsing constant pool entries
346 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
347
348 int index = 1; // declared outside of loops for portability
349
350 // first verification pass - validate cross references and fixup class and string constants
351 for (index = 1; index < length; index++) { // Index 0 is unused
352 jbyte tag = cp->tag_at(index).value();
353 switch (tag) {
354 case JVM_CONSTANT_Class :
355 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
356 break;
357 case JVM_CONSTANT_Fieldref :
358 // fall through
359 case JVM_CONSTANT_Methodref :
360 // fall through
361 case JVM_CONSTANT_InterfaceMethodref : {
362 if (!_need_verify) break;
363 int klass_ref_index = cp->klass_ref_index_at(index);
364 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
365 check_property(valid_cp_range(klass_ref_index, length) &&
366 is_klass_reference(cp, klass_ref_index),
367 "Invalid constant pool index %u in class file %s",
368 klass_ref_index,
369 CHECK_(nullHandle));
370 check_property(valid_cp_range(name_and_type_ref_index, length) &&
371 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
372 "Invalid constant pool index %u in class file %s",
373 name_and_type_ref_index,
374 CHECK_(nullHandle));
375 break;
376 }
377 case JVM_CONSTANT_String :
378 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
379 break;
380 case JVM_CONSTANT_Integer :
381 break;
382 case JVM_CONSTANT_Float :
383 break;
384 case JVM_CONSTANT_Long :
385 case JVM_CONSTANT_Double :
386 index++;
387 check_property(
388 (index < length && cp->tag_at(index).is_invalid()),
389 "Improper constant pool long/double index %u in class file %s",
390 index, CHECK_(nullHandle));
391 break;
392 case JVM_CONSTANT_NameAndType : {
393 if (!_need_verify) break;
394 int name_ref_index = cp->name_ref_index_at(index);
395 int signature_ref_index = cp->signature_ref_index_at(index);
396 check_property(
397 valid_cp_range(name_ref_index, length) &&
398 cp->tag_at(name_ref_index).is_utf8(),
399 "Invalid constant pool index %u in class file %s",
400 name_ref_index, CHECK_(nullHandle));
401 check_property(
402 valid_cp_range(signature_ref_index, length) &&
403 cp->tag_at(signature_ref_index).is_utf8(),
404 "Invalid constant pool index %u in class file %s",
405 signature_ref_index, CHECK_(nullHandle));
406 break;
407 }
408 case JVM_CONSTANT_Utf8 :
409 break;
410 case JVM_CONSTANT_UnresolvedClass : // fall-through
411 case JVM_CONSTANT_UnresolvedClassInError:
412 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
413 break;
414 case JVM_CONSTANT_ClassIndex :
415 {
416 int class_index = cp->klass_index_at(index);
417 check_property(
418 valid_cp_range(class_index, length) &&
419 cp->tag_at(class_index).is_utf8(),
420 "Invalid constant pool index %u in class file %s",
421 class_index, CHECK_(nullHandle));
422 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
423 }
424 break;
425 case JVM_CONSTANT_UnresolvedString :
426 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
427 break;
428 case JVM_CONSTANT_StringIndex :
429 {
430 int string_index = cp->string_index_at(index);
431 check_property(
432 valid_cp_range(string_index, length) &&
433 cp->tag_at(string_index).is_utf8(),
434 "Invalid constant pool index %u in class file %s",
435 string_index, CHECK_(nullHandle));
436 Symbol* sym = cp->symbol_at(string_index);
437 cp->unresolved_string_at_put(index, sym);
438 }
439 break;
440 case JVM_CONSTANT_MethodHandle :
441 {
442 int ref_index = cp->method_handle_index_at(index);
443 check_property(
444 valid_cp_range(ref_index, length) &&
445 EnableMethodHandles,
446 "Invalid constant pool index %u in class file %s",
447 ref_index, CHECK_(nullHandle));
448 constantTag tag = cp->tag_at(ref_index);
449 int ref_kind = cp->method_handle_ref_kind_at(index);
450 switch (ref_kind) {
451 case JVM_REF_getField:
452 case JVM_REF_getStatic:
453 case JVM_REF_putField:
454 case JVM_REF_putStatic:
455 check_property(
456 tag.is_field(),
457 "Invalid constant pool index %u in class file %s (not a field)",
458 ref_index, CHECK_(nullHandle));
459 break;
460 case JVM_REF_invokeVirtual:
461 case JVM_REF_invokeStatic:
462 case JVM_REF_invokeSpecial:
463 case JVM_REF_newInvokeSpecial:
464 check_property(
465 tag.is_method(),
466 "Invalid constant pool index %u in class file %s (not a method)",
467 ref_index, CHECK_(nullHandle));
468 break;
469 case JVM_REF_invokeInterface:
470 check_property(
471 tag.is_interface_method(),
472 "Invalid constant pool index %u in class file %s (not an interface method)",
473 ref_index, CHECK_(nullHandle));
474 break;
475 default:
476 classfile_parse_error(
477 "Bad method handle kind at constant pool index %u in class file %s",
478 index, CHECK_(nullHandle));
479 }
480 // Keep the ref_index unchanged. It will be indirected at link-time.
481 }
482 break;
483 case JVM_CONSTANT_MethodType :
484 {
485 int ref_index = cp->method_type_index_at(index);
486 check_property(
487 valid_cp_range(ref_index, length) &&
488 cp->tag_at(ref_index).is_utf8() &&
489 EnableMethodHandles,
490 "Invalid constant pool index %u in class file %s",
491 ref_index, CHECK_(nullHandle));
492 }
493 break;
494 case JVM_CONSTANT_InvokeDynamicTrans :
495 case JVM_CONSTANT_InvokeDynamic :
496 {
497 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
498 check_property(valid_cp_range(name_and_type_ref_index, length) &&
499 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
500 "Invalid constant pool index %u in class file %s",
501 name_and_type_ref_index,
502 CHECK_(nullHandle));
503 if (tag == JVM_CONSTANT_InvokeDynamicTrans) {
504 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
505 check_property(valid_cp_range(bootstrap_method_ref_index, length) &&
506 cp->tag_at(bootstrap_method_ref_index).is_method_handle(),
507 "Invalid constant pool index %u in class file %s",
508 bootstrap_method_ref_index,
509 CHECK_(nullHandle));
510 }
511 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
512 break;
513 }
514 default:
515 fatal(err_msg("bad constant pool tag value %u",
516 cp->tag_at(index).value()));
517 ShouldNotReachHere();
518 break;
519 } // end of switch
520 } // end of for
521
522 if (_cp_patches != NULL) {
523 // need to treat this_class specially...
524 assert(AnonymousClasses, "");
525 int this_class_index;
526 {
527 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
528 u1* mark = cfs->current();
529 u2 flags = cfs->get_u2_fast();
530 this_class_index = cfs->get_u2_fast();
531 cfs->set_current(mark); // revert to mark
532 }
533
534 for (index = 1; index < length; index++) { // Index 0 is unused
535 if (has_cp_patch_at(index)) {
536 guarantee_property(index != this_class_index,
537 "Illegal constant pool patch to self at %d in class file %s",
538 index, CHECK_(nullHandle));
539 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
540 }
541 }
542 // Ensure that all the patches have been used.
543 for (index = 0; index < _cp_patches->length(); index++) {
544 guarantee_property(!has_cp_patch_at(index),
545 "Unused constant pool patch at %d in class file %s",
546 index, CHECK_(nullHandle));
547 }
548 }
549
550 if (!_need_verify) {
551 cp_in_error.set_in_error(false);
552 return cp;
553 }
554
555 // second verification pass - checks the strings are of the right format.
556 // but not yet to the other entries
557 for (index = 1; index < length; index++) {
558 jbyte tag = cp->tag_at(index).value();
559 switch (tag) {
560 case JVM_CONSTANT_UnresolvedClass: {
561 Symbol* class_name = cp->unresolved_klass_at(index);
562 // check the name, even if _cp_patches will overwrite it
563 verify_legal_class_name(class_name, CHECK_(nullHandle));
564 break;
565 }
566 case JVM_CONSTANT_NameAndType: {
567 if (_need_verify && _major_version >= JAVA_7_VERSION) {
568 int sig_index = cp->signature_ref_index_at(index);
569 int name_index = cp->name_ref_index_at(index);
570 Symbol* name = cp->symbol_at(name_index);
571 Symbol* sig = cp->symbol_at(sig_index);
572 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
573 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
574 } else {
575 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
576 }
577 }
578 break;
579 }
580 case JVM_CONSTANT_Fieldref:
581 case JVM_CONSTANT_Methodref:
582 case JVM_CONSTANT_InterfaceMethodref: {
583 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
584 // already verified to be utf8
585 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
586 // already verified to be utf8
587 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
588 Symbol* name = cp->symbol_at(name_ref_index);
589 Symbol* signature = cp->symbol_at(signature_ref_index);
590 if (tag == JVM_CONSTANT_Fieldref) {
591 verify_legal_field_name(name, CHECK_(nullHandle));
592 if (_need_verify && _major_version >= JAVA_7_VERSION) {
593 // Signature is verified above, when iterating NameAndType_info.
594 // Need only to be sure it's the right type.
595 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
596 throwIllegalSignature(
597 "Field", name, signature, CHECK_(nullHandle));
598 }
599 } else {
600 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
601 }
602 } else {
603 verify_legal_method_name(name, CHECK_(nullHandle));
604 if (_need_verify && _major_version >= JAVA_7_VERSION) {
605 // Signature is verified above, when iterating NameAndType_info.
606 // Need only to be sure it's the right type.
607 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
608 throwIllegalSignature(
609 "Method", name, signature, CHECK_(nullHandle));
610 }
611 } else {
612 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
613 }
614 if (tag == JVM_CONSTANT_Methodref) {
615 // 4509014: If a class method name begins with '<', it must be "<init>".
616 assert(name != NULL, "method name in constant pool is null");
617 unsigned int name_len = name->utf8_length();
618 assert(name_len > 0, "bad method name"); // already verified as legal name
619 if (name->byte_at(0) == '<') {
620 if (name != vmSymbols::object_initializer_name()) {
621 classfile_parse_error(
622 "Bad method name at constant pool index %u in class file %s",
623 name_ref_index, CHECK_(nullHandle));
624 }
625 }
626 }
627 }
628 break;
629 }
630 case JVM_CONSTANT_MethodHandle: {
631 int ref_index = cp->method_handle_index_at(index);
632 int ref_kind = cp->method_handle_ref_kind_at(index);
633 switch (ref_kind) {
634 case JVM_REF_invokeVirtual:
635 case JVM_REF_invokeStatic:
636 case JVM_REF_invokeSpecial:
637 case JVM_REF_newInvokeSpecial:
638 {
639 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
640 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
641 Symbol* name = cp->symbol_at(name_ref_index);
642 if (ref_kind == JVM_REF_newInvokeSpecial) {
643 if (name != vmSymbols::object_initializer_name()) {
644 classfile_parse_error(
645 "Bad constructor name at constant pool index %u in class file %s",
646 name_ref_index, CHECK_(nullHandle));
647 }
648 } else {
649 if (name == vmSymbols::object_initializer_name()) {
650 classfile_parse_error(
651 "Bad method name at constant pool index %u in class file %s",
652 name_ref_index, CHECK_(nullHandle));
653 }
654 }
655 }
656 break;
657 // Other ref_kinds are already fully checked in previous pass.
658 }
659 break;
660 }
661 case JVM_CONSTANT_MethodType: {
662 Symbol* no_name = vmSymbols::type_name(); // place holder
663 Symbol* signature = cp->method_type_signature_at(index);
664 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
665 break;
666 }
667 case JVM_CONSTANT_Utf8: {
668 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
669 }
670 } // end of switch
671 } // end of for
672
673 cp_in_error.set_in_error(false);
674 return cp;
675 }
676
677
678 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
679 assert(AnonymousClasses, "");
680 BasicType patch_type = T_VOID;
681 switch (cp->tag_at(index).value()) {
682
683 case JVM_CONSTANT_UnresolvedClass :
684 // Patching a class means pre-resolving it.
685 // The name in the constant pool is ignored.
686 if (java_lang_Class::is_instance(patch())) {
687 guarantee_property(!java_lang_Class::is_primitive(patch()),
688 "Illegal class patch at %d in class file %s",
689 index, CHECK);
690 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
691 } else {
692 guarantee_property(java_lang_String::is_instance(patch()),
693 "Illegal class patch at %d in class file %s",
694 index, CHECK);
695 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
696 cp->unresolved_klass_at_put(index, name);
697 }
698 break;
699
700 case JVM_CONSTANT_UnresolvedString :
701 // Patching a string means pre-resolving it.
702 // The spelling in the constant pool is ignored.
703 // The constant reference may be any object whatever.
704 // If it is not a real interned string, the constant is referred
705 // to as a "pseudo-string", and must be presented to the CP
706 // explicitly, because it may require scavenging.
707 cp->pseudo_string_at_put(index, patch());
708 break;
709
710 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
711 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
712 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
713 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
714 patch_prim:
715 {
716 jvalue value;
717 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
718 guarantee_property(value_type == patch_type,
719 "Illegal primitive patch at %d in class file %s",
720 index, CHECK);
721 switch (value_type) {
722 case T_INT: cp->int_at_put(index, value.i); break;
723 case T_FLOAT: cp->float_at_put(index, value.f); break;
724 case T_LONG: cp->long_at_put(index, value.j); break;
725 case T_DOUBLE: cp->double_at_put(index, value.d); break;
726 default: assert(false, "");
727 }
728 }
729 break;
730
731 default:
732 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
733 guarantee_property(!has_cp_patch_at(index),
734 "Illegal unexpected patch at %d in class file %s",
735 index, CHECK);
736 return;
737 }
738
739 // On fall-through, mark the patch as used.
740 clear_cp_patch_at(index);
741 }
742
743
744
745 class NameSigHash: public ResourceObj {
746 public:
747 Symbol* _name; // name
748 Symbol* _sig; // signature
749 NameSigHash* _next; // Next entry in hash table
750 };
751
752
753 #define HASH_ROW_SIZE 256
754
755 unsigned int hash(Symbol* name, Symbol* sig) {
756 unsigned int raw_hash = 0;
757 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
758 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
759
760 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
761 }
762
763
764 void initialize_hashtable(NameSigHash** table) {
765 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
766 }
767
768 // Return false if the name/sig combination is found in table.
769 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
770 // The old format checker uses heap sort to find duplicates.
771 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
772 // of table since we don't expect Symbol*'s to move.
773 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
774 assert(name != NULL, "name in constant pool is NULL");
775
776 // First lookup for duplicates
777 int index = hash(name, sig);
778 NameSigHash* entry = table[index];
779 while (entry != NULL) {
780 if (entry->_name == name && entry->_sig == sig) {
781 return false;
782 }
783 entry = entry->_next;
784 }
785
786 // No duplicate is found, allocate a new entry and fill it.
787 entry = new NameSigHash();
788 entry->_name = name;
789 entry->_sig = sig;
790
791 // Insert into hash table
792 entry->_next = table[index];
793 table[index] = entry;
794
795 return true;
796 }
797
798
799 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
800 int length,
801 Handle class_loader,
802 Handle protection_domain,
803 Symbol* class_name,
804 TRAPS) {
805 ClassFileStream* cfs = stream();
806 assert(length > 0, "only called for length>0");
807 objArrayHandle nullHandle;
808 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
809 objArrayHandle interfaces (THREAD, interface_oop);
810
811 int index;
812 for (index = 0; index < length; index++) {
813 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
814 KlassHandle interf;
815 check_property(
816 valid_cp_range(interface_index, cp->length()) &&
817 is_klass_reference(cp, interface_index),
818 "Interface name has bad constant pool index %u in class file %s",
819 interface_index, CHECK_(nullHandle));
820 if (cp->tag_at(interface_index).is_klass()) {
821 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
822 } else {
823 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
824
825 // Don't need to check legal name because it's checked when parsing constant pool.
826 // But need to make sure it's not an array type.
827 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
828 "Bad interface name in class file %s", CHECK_(nullHandle));
829
830 // Call resolve_super so classcircularity is checked
831 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
832 unresolved_klass, class_loader, protection_domain,
833 false, CHECK_(nullHandle));
834 interf = KlassHandle(THREAD, k);
835
836 if (LinkWellKnownClasses) // my super type is well known to me
837 cp->klass_at_put(interface_index, interf()); // eagerly resolve
838 }
839
840 if (!Klass::cast(interf())->is_interface()) {
841 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
842 }
843 interfaces->obj_at_put(index, interf());
844 }
845
846 if (!_need_verify || length <= 1) {
847 return interfaces;
848 }
849
850 // Check if there's any duplicates in interfaces
851 ResourceMark rm(THREAD);
852 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
853 THREAD, NameSigHash*, HASH_ROW_SIZE);
854 initialize_hashtable(interface_names);
855 bool dup = false;
856 {
857 debug_only(No_Safepoint_Verifier nsv;)
858 for (index = 0; index < length; index++) {
859 klassOop k = (klassOop)interfaces->obj_at(index);
860 Symbol* name = instanceKlass::cast(k)->name();
861 // If no duplicates, add (name, NULL) in hashtable interface_names.
862 if (!put_after_lookup(name, NULL, interface_names)) {
863 dup = true;
864 break;
865 }
866 }
867 }
868 if (dup) {
869 classfile_parse_error("Duplicate interface name in class file %s",
870 CHECK_(nullHandle));
871 }
872
873 return interfaces;
874 }
875
876
877 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
878 // Make sure the constant pool entry is of a type appropriate to this field
879 guarantee_property(
880 (constantvalue_index > 0 &&
881 constantvalue_index < cp->length()),
882 "Bad initial value index %u in ConstantValue attribute in class file %s",
883 constantvalue_index, CHECK);
884 constantTag value_type = cp->tag_at(constantvalue_index);
885 switch ( cp->basic_type_for_signature_at(signature_index) ) {
886 case T_LONG:
887 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
888 break;
889 case T_FLOAT:
890 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
891 break;
892 case T_DOUBLE:
893 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
894 break;
895 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
896 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
897 break;
898 case T_OBJECT:
899 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
900 && (value_type.is_string() || value_type.is_unresolved_string())),
901 "Bad string initial value in class file %s", CHECK);
902 break;
903 default:
904 classfile_parse_error(
905 "Unable to set initial value %u in class file %s",
906 constantvalue_index, CHECK);
907 }
908 }
909
910
911 // Parse attributes for a field.
912 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
913 u2 attributes_count,
914 bool is_static, u2 signature_index,
915 u2* constantvalue_index_addr,
916 bool* is_synthetic_addr,
917 u2* generic_signature_index_addr,
918 typeArrayHandle* field_annotations,
919 TRAPS) {
920 ClassFileStream* cfs = stream();
921 assert(attributes_count > 0, "length should be greater than 0");
922 u2 constantvalue_index = 0;
923 u2 generic_signature_index = 0;
924 bool is_synthetic = false;
925 u1* runtime_visible_annotations = NULL;
926 int runtime_visible_annotations_length = 0;
927 u1* runtime_invisible_annotations = NULL;
928 int runtime_invisible_annotations_length = 0;
929 while (attributes_count--) {
930 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
931 u2 attribute_name_index = cfs->get_u2_fast();
932 u4 attribute_length = cfs->get_u4_fast();
933 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
934 cp->tag_at(attribute_name_index).is_utf8(),
935 "Invalid field attribute index %u in class file %s",
936 attribute_name_index,
937 CHECK);
938 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
939 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
940 // ignore if non-static
941 if (constantvalue_index != 0) {
942 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
943 }
944 check_property(
945 attribute_length == 2,
946 "Invalid ConstantValue field attribute length %u in class file %s",
947 attribute_length, CHECK);
948 constantvalue_index = cfs->get_u2(CHECK);
949 if (_need_verify) {
950 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
951 }
952 } else if (attribute_name == vmSymbols::tag_synthetic()) {
953 if (attribute_length != 0) {
954 classfile_parse_error(
955 "Invalid Synthetic field attribute length %u in class file %s",
956 attribute_length, CHECK);
957 }
958 is_synthetic = true;
959 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
960 if (attribute_length != 0) {
961 classfile_parse_error(
962 "Invalid Deprecated field attribute length %u in class file %s",
963 attribute_length, CHECK);
964 }
965 } else if (_major_version >= JAVA_1_5_VERSION) {
966 if (attribute_name == vmSymbols::tag_signature()) {
967 if (attribute_length != 2) {
968 classfile_parse_error(
969 "Wrong size %u for field's Signature attribute in class file %s",
970 attribute_length, CHECK);
971 }
972 generic_signature_index = cfs->get_u2(CHECK);
973 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
974 runtime_visible_annotations_length = attribute_length;
975 runtime_visible_annotations = cfs->get_u1_buffer();
976 assert(runtime_visible_annotations != NULL, "null visible annotations");
977 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
978 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
979 runtime_invisible_annotations_length = attribute_length;
980 runtime_invisible_annotations = cfs->get_u1_buffer();
981 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
982 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
983 } else {
984 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
985 }
986 } else {
987 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
988 }
989 }
990
991 *constantvalue_index_addr = constantvalue_index;
992 *is_synthetic_addr = is_synthetic;
993 *generic_signature_index_addr = generic_signature_index;
994 *field_annotations = assemble_annotations(runtime_visible_annotations,
995 runtime_visible_annotations_length,
996 runtime_invisible_annotations,
997 runtime_invisible_annotations_length,
998 CHECK);
999 return;
1000 }
1001
1002
1003 // Field allocation types. Used for computing field offsets.
1004
1005 enum FieldAllocationType {
1006 STATIC_OOP, // Oops
1007 STATIC_BYTE, // Boolean, Byte, char
1008 STATIC_SHORT, // shorts
1009 STATIC_WORD, // ints
1010 STATIC_DOUBLE, // long or double
1011 STATIC_ALIGNED_DOUBLE,// aligned long or double
1012 NONSTATIC_OOP,
1013 NONSTATIC_BYTE,
1014 NONSTATIC_SHORT,
1015 NONSTATIC_WORD,
1016 NONSTATIC_DOUBLE,
1017 NONSTATIC_ALIGNED_DOUBLE
1018 };
1019
1020
1021 struct FieldAllocationCount {
1022 unsigned int static_oop_count;
1023 unsigned int static_byte_count;
1024 unsigned int static_short_count;
1025 unsigned int static_word_count;
1026 unsigned int static_double_count;
1027 unsigned int nonstatic_oop_count;
1028 unsigned int nonstatic_byte_count;
1029 unsigned int nonstatic_short_count;
1030 unsigned int nonstatic_word_count;
1031 unsigned int nonstatic_double_count;
1032 };
1033
1034 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
1035 struct FieldAllocationCount *fac,
1036 objArrayHandle* fields_annotations, TRAPS) {
1037 ClassFileStream* cfs = stream();
1038 typeArrayHandle nullHandle;
1039 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1040 u2 length = cfs->get_u2_fast();
1041 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1042 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1043 typeArrayHandle fields(THREAD, new_fields);
1044
1045 int index = 0;
1046 typeArrayHandle field_annotations;
1047 for (int n = 0; n < length; n++) {
1048 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1049
1050 AccessFlags access_flags;
1051 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1052 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1053 access_flags.set_flags(flags);
1054
1055 u2 name_index = cfs->get_u2_fast();
1056 int cp_size = cp->length();
1057 check_property(
1058 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1059 "Invalid constant pool index %u for field name in class file %s",
1060 name_index, CHECK_(nullHandle));
1061 Symbol* name = cp->symbol_at(name_index);
1062 verify_legal_field_name(name, CHECK_(nullHandle));
1063
1064 u2 signature_index = cfs->get_u2_fast();
1065 check_property(
1066 valid_cp_range(signature_index, cp_size) &&
1067 cp->tag_at(signature_index).is_utf8(),
1068 "Invalid constant pool index %u for field signature in class file %s",
1069 signature_index, CHECK_(nullHandle));
1070 Symbol* sig = cp->symbol_at(signature_index);
1071 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1072
1073 u2 constantvalue_index = 0;
1074 bool is_synthetic = false;
1075 u2 generic_signature_index = 0;
1076 bool is_static = access_flags.is_static();
1077
1078 u2 attributes_count = cfs->get_u2_fast();
1079 if (attributes_count > 0) {
1080 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1081 &constantvalue_index, &is_synthetic,
1082 &generic_signature_index, &field_annotations,
1083 CHECK_(nullHandle));
1084 if (field_annotations.not_null()) {
1085 if (fields_annotations->is_null()) {
1086 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1087 *fields_annotations = objArrayHandle(THREAD, md);
1088 }
1089 (*fields_annotations)->obj_at_put(n, field_annotations());
1090 }
1091 if (is_synthetic) {
1092 access_flags.set_is_synthetic();
1093 }
1094 }
1095
1096 fields->short_at_put(index++, access_flags.as_short());
1097 fields->short_at_put(index++, name_index);
1098 fields->short_at_put(index++, signature_index);
1099 fields->short_at_put(index++, constantvalue_index);
1100
1101 // Remember how many oops we encountered and compute allocation type
1102 BasicType type = cp->basic_type_for_signature_at(signature_index);
1103 FieldAllocationType atype;
1104 if ( is_static ) {
1105 switch ( type ) {
1106 case T_BOOLEAN:
1107 case T_BYTE:
1108 fac->static_byte_count++;
1109 atype = STATIC_BYTE;
1110 break;
1111 case T_LONG:
1112 case T_DOUBLE:
1113 if (Universe::field_type_should_be_aligned(type)) {
1114 atype = STATIC_ALIGNED_DOUBLE;
1115 } else {
1116 atype = STATIC_DOUBLE;
1117 }
1118 fac->static_double_count++;
1119 break;
1120 case T_CHAR:
1121 case T_SHORT:
1122 fac->static_short_count++;
1123 atype = STATIC_SHORT;
1124 break;
1125 case T_FLOAT:
1126 case T_INT:
1127 fac->static_word_count++;
1128 atype = STATIC_WORD;
1129 break;
1130 case T_ARRAY:
1131 case T_OBJECT:
1132 fac->static_oop_count++;
1133 atype = STATIC_OOP;
1134 break;
1135 case T_ADDRESS:
1136 case T_VOID:
1137 default:
1138 assert(0, "bad field type");
1139 }
1140 } else {
1141 switch ( type ) {
1142 case T_BOOLEAN:
1143 case T_BYTE:
1144 fac->nonstatic_byte_count++;
1145 atype = NONSTATIC_BYTE;
1146 break;
1147 case T_LONG:
1148 case T_DOUBLE:
1149 if (Universe::field_type_should_be_aligned(type)) {
1150 atype = NONSTATIC_ALIGNED_DOUBLE;
1151 } else {
1152 atype = NONSTATIC_DOUBLE;
1153 }
1154 fac->nonstatic_double_count++;
1155 break;
1156 case T_CHAR:
1157 case T_SHORT:
1158 fac->nonstatic_short_count++;
1159 atype = NONSTATIC_SHORT;
1160 break;
1161 case T_FLOAT:
1162 case T_INT:
1163 fac->nonstatic_word_count++;
1164 atype = NONSTATIC_WORD;
1165 break;
1166 case T_ARRAY:
1167 case T_OBJECT:
1168 fac->nonstatic_oop_count++;
1169 atype = NONSTATIC_OOP;
1170 break;
1171 case T_ADDRESS:
1172 case T_VOID:
1173 default:
1174 assert(0, "bad field type");
1175 }
1176 }
1177
1178 // The correct offset is computed later (all oop fields will be located together)
1179 // We temporarily store the allocation type in the offset field
1180 fields->short_at_put(index++, atype);
1181 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1182 fields->short_at_put(index++, generic_signature_index);
1183 }
1184
1185 if (_need_verify && length > 1) {
1186 // Check duplicated fields
1187 ResourceMark rm(THREAD);
1188 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1189 THREAD, NameSigHash*, HASH_ROW_SIZE);
1190 initialize_hashtable(names_and_sigs);
1191 bool dup = false;
1192 {
1193 debug_only(No_Safepoint_Verifier nsv;)
1194 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1195 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1196 Symbol* name = cp->symbol_at(name_index);
1197 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1198 Symbol* sig = cp->symbol_at(sig_index);
1199 // If no duplicates, add name/signature in hashtable names_and_sigs.
1200 if (!put_after_lookup(name, sig, names_and_sigs)) {
1201 dup = true;
1202 break;
1203 }
1204 }
1205 }
1206 if (dup) {
1207 classfile_parse_error("Duplicate field name&signature in class file %s",
1208 CHECK_(nullHandle));
1209 }
1210 }
1211
1212 return fields;
1213 }
1214
1215
1216 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1217 while (length-- > 0) {
1218 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1219 }
1220 }
1221
1222
1223 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1224 u4 exception_table_length,
1225 constantPoolHandle cp,
1226 TRAPS) {
1227 ClassFileStream* cfs = stream();
1228 typeArrayHandle nullHandle;
1229
1230 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1231 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1232 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1233
1234 int index = 0;
1235 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1236 for (unsigned int i = 0; i < exception_table_length; i++) {
1237 u2 start_pc = cfs->get_u2_fast();
1238 u2 end_pc = cfs->get_u2_fast();
1239 u2 handler_pc = cfs->get_u2_fast();
1240 u2 catch_type_index = cfs->get_u2_fast();
1241 // Will check legal target after parsing code array in verifier.
1242 if (_need_verify) {
1243 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1244 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1245 guarantee_property(handler_pc < code_length,
1246 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1247 if (catch_type_index != 0) {
1248 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1249 is_klass_reference(cp, catch_type_index),
1250 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1251 }
1252 }
1253 exception_handlers->int_at_put(index++, start_pc);
1254 exception_handlers->int_at_put(index++, end_pc);
1255 exception_handlers->int_at_put(index++, handler_pc);
1256 exception_handlers->int_at_put(index++, catch_type_index);
1257 }
1258 return exception_handlers;
1259 }
1260
1261 void ClassFileParser::parse_linenumber_table(
1262 u4 code_attribute_length, u4 code_length,
1263 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1264 ClassFileStream* cfs = stream();
1265 unsigned int num_entries = cfs->get_u2(CHECK);
1266
1267 // Each entry is a u2 start_pc, and a u2 line_number
1268 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1269
1270 // Verify line number attribute and table length
1271 check_property(
1272 code_attribute_length == sizeof(u2) + length_in_bytes,
1273 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1274
1275 cfs->guarantee_more(length_in_bytes, CHECK);
1276
1277 if ((*write_stream) == NULL) {
1278 if (length_in_bytes > fixed_buffer_size) {
1279 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1280 } else {
1281 (*write_stream) = new CompressedLineNumberWriteStream(
1282 linenumbertable_buffer, fixed_buffer_size);
1283 }
1284 }
1285
1286 while (num_entries-- > 0) {
1287 u2 bci = cfs->get_u2_fast(); // start_pc
1288 u2 line = cfs->get_u2_fast(); // line_number
1289 guarantee_property(bci < code_length,
1290 "Invalid pc in LineNumberTable in class file %s", CHECK);
1291 (*write_stream)->write_pair(bci, line);
1292 }
1293 }
1294
1295
1296 // Class file LocalVariableTable elements.
1297 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1298 public:
1299 u2 start_bci;
1300 u2 length;
1301 u2 name_cp_index;
1302 u2 descriptor_cp_index;
1303 u2 slot;
1304 };
1305
1306
1307 class LVT_Hash: public CHeapObj {
1308 public:
1309 LocalVariableTableElement *_elem; // element
1310 LVT_Hash* _next; // Next entry in hash table
1311 };
1312
1313 unsigned int hash(LocalVariableTableElement *elem) {
1314 unsigned int raw_hash = elem->start_bci;
1315
1316 raw_hash = elem->length + raw_hash * 37;
1317 raw_hash = elem->name_cp_index + raw_hash * 37;
1318 raw_hash = elem->slot + raw_hash * 37;
1319
1320 return raw_hash % HASH_ROW_SIZE;
1321 }
1322
1323 void initialize_hashtable(LVT_Hash** table) {
1324 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1325 table[i] = NULL;
1326 }
1327 }
1328
1329 void clear_hashtable(LVT_Hash** table) {
1330 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1331 LVT_Hash* current = table[i];
1332 LVT_Hash* next;
1333 while (current != NULL) {
1334 next = current->_next;
1335 current->_next = NULL;
1336 delete(current);
1337 current = next;
1338 }
1339 table[i] = NULL;
1340 }
1341 }
1342
1343 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1344 LVT_Hash* entry = table[index];
1345
1346 /*
1347 * 3-tuple start_bci/length/slot has to be unique key,
1348 * so the following comparison seems to be redundant:
1349 * && elem->name_cp_index == entry->_elem->name_cp_index
1350 */
1351 while (entry != NULL) {
1352 if (elem->start_bci == entry->_elem->start_bci
1353 && elem->length == entry->_elem->length
1354 && elem->name_cp_index == entry->_elem->name_cp_index
1355 && elem->slot == entry->_elem->slot
1356 ) {
1357 return entry;
1358 }
1359 entry = entry->_next;
1360 }
1361 return NULL;
1362 }
1363
1364 // Return false if the local variable is found in table.
1365 // Return true if no duplicate is found.
1366 // And local variable is added as a new entry in table.
1367 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1368 // First lookup for duplicates
1369 int index = hash(elem);
1370 LVT_Hash* entry = LVT_lookup(elem, index, table);
1371
1372 if (entry != NULL) {
1373 return false;
1374 }
1375 // No duplicate is found, allocate a new entry and fill it.
1376 if ((entry = new LVT_Hash()) == NULL) {
1377 return false;
1378 }
1379 entry->_elem = elem;
1380
1381 // Insert into hash table
1382 entry->_next = table[index];
1383 table[index] = entry;
1384
1385 return true;
1386 }
1387
1388 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1389 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1390 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1391 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1392 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1393 lvt->signature_cp_index = 0;
1394 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1395 }
1396
1397 // Function is used to parse both attributes:
1398 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1399 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1400 u2 max_locals,
1401 u4 code_attribute_length,
1402 constantPoolHandle cp,
1403 u2* localvariable_table_length,
1404 bool isLVTT,
1405 TRAPS) {
1406 ClassFileStream* cfs = stream();
1407 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1408 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1409 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1410 // Verify local variable table attribute has right length
1411 if (_need_verify) {
1412 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1413 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1414 }
1415 u2* localvariable_table_start = cfs->get_u2_buffer();
1416 assert(localvariable_table_start != NULL, "null local variable table");
1417 if (!_need_verify) {
1418 cfs->skip_u2_fast(size);
1419 } else {
1420 cfs->guarantee_more(size * 2, CHECK_NULL);
1421 for(int i = 0; i < (*localvariable_table_length); i++) {
1422 u2 start_pc = cfs->get_u2_fast();
1423 u2 length = cfs->get_u2_fast();
1424 u2 name_index = cfs->get_u2_fast();
1425 u2 descriptor_index = cfs->get_u2_fast();
1426 u2 index = cfs->get_u2_fast();
1427 // Assign to a u4 to avoid overflow
1428 u4 end_pc = (u4)start_pc + (u4)length;
1429
1430 if (start_pc >= code_length) {
1431 classfile_parse_error(
1432 "Invalid start_pc %u in %s in class file %s",
1433 start_pc, tbl_name, CHECK_NULL);
1434 }
1435 if (end_pc > code_length) {
1436 classfile_parse_error(
1437 "Invalid length %u in %s in class file %s",
1438 length, tbl_name, CHECK_NULL);
1439 }
1440 int cp_size = cp->length();
1441 guarantee_property(
1442 valid_cp_range(name_index, cp_size) &&
1443 cp->tag_at(name_index).is_utf8(),
1444 "Name index %u in %s has bad constant type in class file %s",
1445 name_index, tbl_name, CHECK_NULL);
1446 guarantee_property(
1447 valid_cp_range(descriptor_index, cp_size) &&
1448 cp->tag_at(descriptor_index).is_utf8(),
1449 "Signature index %u in %s has bad constant type in class file %s",
1450 descriptor_index, tbl_name, CHECK_NULL);
1451
1452 Symbol* name = cp->symbol_at(name_index);
1453 Symbol* sig = cp->symbol_at(descriptor_index);
1454 verify_legal_field_name(name, CHECK_NULL);
1455 u2 extra_slot = 0;
1456 if (!isLVTT) {
1457 verify_legal_field_signature(name, sig, CHECK_NULL);
1458
1459 // 4894874: check special cases for double and long local variables
1460 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1461 sig == vmSymbols::type_signature(T_LONG)) {
1462 extra_slot = 1;
1463 }
1464 }
1465 guarantee_property((index + extra_slot) < max_locals,
1466 "Invalid index %u in %s in class file %s",
1467 index, tbl_name, CHECK_NULL);
1468 }
1469 }
1470 return localvariable_table_start;
1471 }
1472
1473
1474 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1475 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1476 ClassFileStream* cfs = stream();
1477 u2 index = 0; // index in the array with long/double occupying two slots
1478 u4 i1 = *u1_index;
1479 u4 i2 = *u2_index + 1;
1480 for(int i = 0; i < array_length; i++) {
1481 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1482 index++;
1483 if (tag == ITEM_Long || tag == ITEM_Double) {
1484 index++;
1485 } else if (tag == ITEM_Object) {
1486 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1487 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1488 is_klass_reference(cp, class_index),
1489 "Bad class index %u in StackMap in class file %s",
1490 class_index, CHECK);
1491 } else if (tag == ITEM_Uninitialized) {
1492 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1493 guarantee_property(
1494 offset < code_length,
1495 "Bad uninitialized type offset %u in StackMap in class file %s",
1496 offset, CHECK);
1497 } else {
1498 guarantee_property(
1499 tag <= (u1)ITEM_Uninitialized,
1500 "Unknown variable type %u in StackMap in class file %s",
1501 tag, CHECK);
1502 }
1503 }
1504 u2_array[*u2_index] = index;
1505 *u1_index = i1;
1506 *u2_index = i2;
1507 }
1508
1509 typeArrayOop ClassFileParser::parse_stackmap_table(
1510 u4 code_attribute_length, TRAPS) {
1511 if (code_attribute_length == 0)
1512 return NULL;
1513
1514 ClassFileStream* cfs = stream();
1515 u1* stackmap_table_start = cfs->get_u1_buffer();
1516 assert(stackmap_table_start != NULL, "null stackmap table");
1517
1518 // check code_attribute_length first
1519 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1520
1521 if (!_need_verify && !DumpSharedSpaces) {
1522 return NULL;
1523 }
1524
1525 typeArrayOop stackmap_data =
1526 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1527
1528 stackmap_data->set_length(code_attribute_length);
1529 memcpy((void*)stackmap_data->byte_at_addr(0),
1530 (void*)stackmap_table_start, code_attribute_length);
1531 return stackmap_data;
1532 }
1533
1534 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1535 u4 method_attribute_length,
1536 constantPoolHandle cp, TRAPS) {
1537 ClassFileStream* cfs = stream();
1538 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1539 *checked_exceptions_length = cfs->get_u2_fast();
1540 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1541 u2* checked_exceptions_start = cfs->get_u2_buffer();
1542 assert(checked_exceptions_start != NULL, "null checked exceptions");
1543 if (!_need_verify) {
1544 cfs->skip_u2_fast(size);
1545 } else {
1546 // Verify each value in the checked exception table
1547 u2 checked_exception;
1548 u2 len = *checked_exceptions_length;
1549 cfs->guarantee_more(2 * len, CHECK_NULL);
1550 for (int i = 0; i < len; i++) {
1551 checked_exception = cfs->get_u2_fast();
1552 check_property(
1553 valid_cp_range(checked_exception, cp->length()) &&
1554 is_klass_reference(cp, checked_exception),
1555 "Exception name has bad type at constant pool %u in class file %s",
1556 checked_exception, CHECK_NULL);
1557 }
1558 }
1559 // check exceptions attribute length
1560 if (_need_verify) {
1561 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1562 sizeof(u2) * size),
1563 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1564 }
1565 return checked_exceptions_start;
1566 }
1567
1568 void ClassFileParser::throwIllegalSignature(
1569 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1570 ResourceMark rm(THREAD);
1571 Exceptions::fthrow(THREAD_AND_LOCATION,
1572 vmSymbols::java_lang_ClassFormatError(),
1573 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1574 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1575 }
1576
1577 #define MAX_ARGS_SIZE 255
1578 #define MAX_CODE_SIZE 65535
1579 #define INITIAL_MAX_LVT_NUMBER 256
1580
1581 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1582 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1583 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1584 // entire method attribute is parsed.
1585 //
1586 // The promoted_flags parameter is used to pass relevant access_flags
1587 // from the method back up to the containing klass. These flag values
1588 // are added to klass's access_flags.
1589
1590 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1591 AccessFlags *promoted_flags,
1592 typeArrayHandle* method_annotations,
1593 typeArrayHandle* method_parameter_annotations,
1594 typeArrayHandle* method_default_annotations,
1595 TRAPS) {
1596 ClassFileStream* cfs = stream();
1597 methodHandle nullHandle;
1598 ResourceMark rm(THREAD);
1599 // Parse fixed parts
1600 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1601
1602 int flags = cfs->get_u2_fast();
1603 u2 name_index = cfs->get_u2_fast();
1604 int cp_size = cp->length();
1605 check_property(
1606 valid_cp_range(name_index, cp_size) &&
1607 cp->tag_at(name_index).is_utf8(),
1608 "Illegal constant pool index %u for method name in class file %s",
1609 name_index, CHECK_(nullHandle));
1610 Symbol* name = cp->symbol_at(name_index);
1611 verify_legal_method_name(name, CHECK_(nullHandle));
1612
1613 u2 signature_index = cfs->get_u2_fast();
1614 guarantee_property(
1615 valid_cp_range(signature_index, cp_size) &&
1616 cp->tag_at(signature_index).is_utf8(),
1617 "Illegal constant pool index %u for method signature in class file %s",
1618 signature_index, CHECK_(nullHandle));
1619 Symbol* signature = cp->symbol_at(signature_index);
1620
1621 AccessFlags access_flags;
1622 if (name == vmSymbols::class_initializer_name()) {
1623 // We ignore the other access flags for a valid class initializer.
1624 // (JVM Spec 2nd ed., chapter 4.6)
1625 if (_major_version < 51) { // backward compatibility
1626 flags = JVM_ACC_STATIC;
1627 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1628 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1629 }
1630 } else {
1631 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1632 }
1633
1634 int args_size = -1; // only used when _need_verify is true
1635 if (_need_verify) {
1636 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1637 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1638 if (args_size > MAX_ARGS_SIZE) {
1639 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1640 }
1641 }
1642
1643 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1644
1645 // Default values for code and exceptions attribute elements
1646 u2 max_stack = 0;
1647 u2 max_locals = 0;
1648 u4 code_length = 0;
1649 u1* code_start = 0;
1650 u2 exception_table_length = 0;
1651 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1652 u2 checked_exceptions_length = 0;
1653 u2* checked_exceptions_start = NULL;
1654 CompressedLineNumberWriteStream* linenumber_table = NULL;
1655 int linenumber_table_length = 0;
1656 int total_lvt_length = 0;
1657 u2 lvt_cnt = 0;
1658 u2 lvtt_cnt = 0;
1659 bool lvt_allocated = false;
1660 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1661 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1662 u2* localvariable_table_length;
1663 u2** localvariable_table_start;
1664 u2* localvariable_type_table_length;
1665 u2** localvariable_type_table_start;
1666 bool parsed_code_attribute = false;
1667 bool parsed_checked_exceptions_attribute = false;
1668 bool parsed_stackmap_attribute = false;
1669 // stackmap attribute - JDK1.5
1670 typeArrayHandle stackmap_data;
1671 u2 generic_signature_index = 0;
1672 u1* runtime_visible_annotations = NULL;
1673 int runtime_visible_annotations_length = 0;
1674 u1* runtime_invisible_annotations = NULL;
1675 int runtime_invisible_annotations_length = 0;
1676 u1* runtime_visible_parameter_annotations = NULL;
1677 int runtime_visible_parameter_annotations_length = 0;
1678 u1* runtime_invisible_parameter_annotations = NULL;
1679 int runtime_invisible_parameter_annotations_length = 0;
1680 u1* annotation_default = NULL;
1681 int annotation_default_length = 0;
1682
1683 // Parse code and exceptions attribute
1684 u2 method_attributes_count = cfs->get_u2_fast();
1685 while (method_attributes_count--) {
1686 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1687 u2 method_attribute_name_index = cfs->get_u2_fast();
1688 u4 method_attribute_length = cfs->get_u4_fast();
1689 check_property(
1690 valid_cp_range(method_attribute_name_index, cp_size) &&
1691 cp->tag_at(method_attribute_name_index).is_utf8(),
1692 "Invalid method attribute name index %u in class file %s",
1693 method_attribute_name_index, CHECK_(nullHandle));
1694
1695 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1696 if (method_attribute_name == vmSymbols::tag_code()) {
1697 // Parse Code attribute
1698 if (_need_verify) {
1699 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1700 "Code attribute in native or abstract methods in class file %s",
1701 CHECK_(nullHandle));
1702 }
1703 if (parsed_code_attribute) {
1704 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1705 }
1706 parsed_code_attribute = true;
1707
1708 // Stack size, locals size, and code size
1709 if (_major_version == 45 && _minor_version <= 2) {
1710 cfs->guarantee_more(4, CHECK_(nullHandle));
1711 max_stack = cfs->get_u1_fast();
1712 max_locals = cfs->get_u1_fast();
1713 code_length = cfs->get_u2_fast();
1714 } else {
1715 cfs->guarantee_more(8, CHECK_(nullHandle));
1716 max_stack = cfs->get_u2_fast();
1717 max_locals = cfs->get_u2_fast();
1718 code_length = cfs->get_u4_fast();
1719 }
1720 if (_need_verify) {
1721 guarantee_property(args_size <= max_locals,
1722 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1723 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1724 "Invalid method Code length %u in class file %s",
1725 code_length, CHECK_(nullHandle));
1726 }
1727 // Code pointer
1728 code_start = cfs->get_u1_buffer();
1729 assert(code_start != NULL, "null code start");
1730 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1731 cfs->skip_u1_fast(code_length);
1732
1733 // Exception handler table
1734 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1735 exception_table_length = cfs->get_u2_fast();
1736 if (exception_table_length > 0) {
1737 exception_handlers =
1738 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1739 }
1740
1741 // Parse additional attributes in code attribute
1742 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1743 u2 code_attributes_count = cfs->get_u2_fast();
1744
1745 unsigned int calculated_attribute_length = 0;
1746
1747 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1748 calculated_attribute_length =
1749 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1750 } else {
1751 // max_stack, locals and length are smaller in pre-version 45.2 classes
1752 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1753 }
1754 calculated_attribute_length +=
1755 code_length +
1756 sizeof(exception_table_length) +
1757 sizeof(code_attributes_count) +
1758 exception_table_length *
1759 ( sizeof(u2) + // start_pc
1760 sizeof(u2) + // end_pc
1761 sizeof(u2) + // handler_pc
1762 sizeof(u2) ); // catch_type_index
1763
1764 while (code_attributes_count--) {
1765 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1766 u2 code_attribute_name_index = cfs->get_u2_fast();
1767 u4 code_attribute_length = cfs->get_u4_fast();
1768 calculated_attribute_length += code_attribute_length +
1769 sizeof(code_attribute_name_index) +
1770 sizeof(code_attribute_length);
1771 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1772 cp->tag_at(code_attribute_name_index).is_utf8(),
1773 "Invalid code attribute name index %u in class file %s",
1774 code_attribute_name_index,
1775 CHECK_(nullHandle));
1776 if (LoadLineNumberTables &&
1777 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1778 // Parse and compress line number table
1779 parse_linenumber_table(code_attribute_length, code_length,
1780 &linenumber_table, CHECK_(nullHandle));
1781
1782 } else if (LoadLocalVariableTables &&
1783 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1784 // Parse local variable table
1785 if (!lvt_allocated) {
1786 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1787 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1788 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1789 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1790 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1791 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1792 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1793 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1794 lvt_allocated = true;
1795 }
1796 if (lvt_cnt == max_lvt_cnt) {
1797 max_lvt_cnt <<= 1;
1798 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1799 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1800 }
1801 localvariable_table_start[lvt_cnt] =
1802 parse_localvariable_table(code_length,
1803 max_locals,
1804 code_attribute_length,
1805 cp,
1806 &localvariable_table_length[lvt_cnt],
1807 false, // is not LVTT
1808 CHECK_(nullHandle));
1809 total_lvt_length += localvariable_table_length[lvt_cnt];
1810 lvt_cnt++;
1811 } else if (LoadLocalVariableTypeTables &&
1812 _major_version >= JAVA_1_5_VERSION &&
1813 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1814 if (!lvt_allocated) {
1815 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1816 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1817 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1818 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1819 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1820 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1821 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1822 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1823 lvt_allocated = true;
1824 }
1825 // Parse local variable type table
1826 if (lvtt_cnt == max_lvtt_cnt) {
1827 max_lvtt_cnt <<= 1;
1828 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1829 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1830 }
1831 localvariable_type_table_start[lvtt_cnt] =
1832 parse_localvariable_table(code_length,
1833 max_locals,
1834 code_attribute_length,
1835 cp,
1836 &localvariable_type_table_length[lvtt_cnt],
1837 true, // is LVTT
1838 CHECK_(nullHandle));
1839 lvtt_cnt++;
1840 } else if (UseSplitVerifier &&
1841 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1842 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1843 // Stack map is only needed by the new verifier in JDK1.5.
1844 if (parsed_stackmap_attribute) {
1845 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1846 }
1847 typeArrayOop sm =
1848 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1849 stackmap_data = typeArrayHandle(THREAD, sm);
1850 parsed_stackmap_attribute = true;
1851 } else {
1852 // Skip unknown attributes
1853 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1854 }
1855 }
1856 // check method attribute length
1857 if (_need_verify) {
1858 guarantee_property(method_attribute_length == calculated_attribute_length,
1859 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1860 }
1861 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1862 // Parse Exceptions attribute
1863 if (parsed_checked_exceptions_attribute) {
1864 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1865 }
1866 parsed_checked_exceptions_attribute = true;
1867 checked_exceptions_start =
1868 parse_checked_exceptions(&checked_exceptions_length,
1869 method_attribute_length,
1870 cp, CHECK_(nullHandle));
1871 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1872 if (method_attribute_length != 0) {
1873 classfile_parse_error(
1874 "Invalid Synthetic method attribute length %u in class file %s",
1875 method_attribute_length, CHECK_(nullHandle));
1876 }
1877 // Should we check that there hasn't already been a synthetic attribute?
1878 access_flags.set_is_synthetic();
1879 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1880 if (method_attribute_length != 0) {
1881 classfile_parse_error(
1882 "Invalid Deprecated method attribute length %u in class file %s",
1883 method_attribute_length, CHECK_(nullHandle));
1884 }
1885 } else if (_major_version >= JAVA_1_5_VERSION) {
1886 if (method_attribute_name == vmSymbols::tag_signature()) {
1887 if (method_attribute_length != 2) {
1888 classfile_parse_error(
1889 "Invalid Signature attribute length %u in class file %s",
1890 method_attribute_length, CHECK_(nullHandle));
1891 }
1892 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1893 generic_signature_index = cfs->get_u2_fast();
1894 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1895 runtime_visible_annotations_length = method_attribute_length;
1896 runtime_visible_annotations = cfs->get_u1_buffer();
1897 assert(runtime_visible_annotations != NULL, "null visible annotations");
1898 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1899 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1900 runtime_invisible_annotations_length = method_attribute_length;
1901 runtime_invisible_annotations = cfs->get_u1_buffer();
1902 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1903 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1904 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1905 runtime_visible_parameter_annotations_length = method_attribute_length;
1906 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1907 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1908 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1909 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1910 runtime_invisible_parameter_annotations_length = method_attribute_length;
1911 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1912 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1913 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1914 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1915 annotation_default_length = method_attribute_length;
1916 annotation_default = cfs->get_u1_buffer();
1917 assert(annotation_default != NULL, "null annotation default");
1918 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1919 } else {
1920 // Skip unknown attributes
1921 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1922 }
1923 } else {
1924 // Skip unknown attributes
1925 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1926 }
1927 }
1928
1929 if (linenumber_table != NULL) {
1930 linenumber_table->write_terminator();
1931 linenumber_table_length = linenumber_table->position();
1932 }
1933
1934 // Make sure there's at least one Code attribute in non-native/non-abstract method
1935 if (_need_verify) {
1936 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1937 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1938 }
1939
1940 // All sizing information for a methodOop is finally available, now create it
1941 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1942 total_lvt_length, checked_exceptions_length,
1943 oopDesc::IsSafeConc, CHECK_(nullHandle));
1944 methodHandle m (THREAD, m_oop);
1945
1946 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1947
1948 // Fill in information from fixed part (access_flags already set)
1949 m->set_constants(cp());
1950 m->set_name_index(name_index);
1951 m->set_signature_index(signature_index);
1952 m->set_generic_signature_index(generic_signature_index);
1953 #ifdef CC_INTERP
1954 // hmm is there a gc issue here??
1955 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1956 m->set_result_index(rtf.type());
1957 #endif
1958
1959 if (args_size >= 0) {
1960 m->set_size_of_parameters(args_size);
1961 } else {
1962 m->compute_size_of_parameters(THREAD);
1963 }
1964 #ifdef ASSERT
1965 if (args_size >= 0) {
1966 m->compute_size_of_parameters(THREAD);
1967 assert(args_size == m->size_of_parameters(), "");
1968 }
1969 #endif
1970
1971 // Fill in code attribute information
1972 m->set_max_stack(max_stack);
1973 m->set_max_locals(max_locals);
1974 m->constMethod()->set_stackmap_data(stackmap_data());
1975
1976 /**
1977 * The exception_table field is the flag used to indicate
1978 * that the methodOop and it's associated constMethodOop are partially
1979 * initialized and thus are exempt from pre/post GC verification. Once
1980 * the field is set, the oops are considered fully initialized so make
1981 * sure that the oops can pass verification when this field is set.
1982 */
1983 m->set_exception_table(exception_handlers());
1984
1985 // Copy byte codes
1986 m->set_code(code_start);
1987
1988 // Copy line number table
1989 if (linenumber_table != NULL) {
1990 memcpy(m->compressed_linenumber_table(),
1991 linenumber_table->buffer(), linenumber_table_length);
1992 }
1993
1994 // Copy checked exceptions
1995 if (checked_exceptions_length > 0) {
1996 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1997 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1998 }
1999
2000 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2001 *
2002 * Rules for LVT's and LVTT's are:
2003 * - There can be any number of LVT's and LVTT's.
2004 * - If there are n LVT's, it is the same as if there was just
2005 * one LVT containing all the entries from the n LVT's.
2006 * - There may be no more than one LVT entry per local variable.
2007 * Two LVT entries are 'equal' if these fields are the same:
2008 * start_pc, length, name, slot
2009 * - There may be no more than one LVTT entry per each LVT entry.
2010 * Each LVTT entry has to match some LVT entry.
2011 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2012 */
2013 if (total_lvt_length > 0) {
2014 int tbl_no, idx;
2015
2016 promoted_flags->set_has_localvariable_table();
2017
2018 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2019 initialize_hashtable(lvt_Hash);
2020
2021 // To fill LocalVariableTable in
2022 Classfile_LVT_Element* cf_lvt;
2023 LocalVariableTableElement* lvt = m->localvariable_table_start();
2024
2025 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2026 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2027 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2028 copy_lvt_element(&cf_lvt[idx], lvt);
2029 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2030 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2031 && _need_verify
2032 && _major_version >= JAVA_1_5_VERSION ) {
2033 clear_hashtable(lvt_Hash);
2034 classfile_parse_error("Duplicated LocalVariableTable attribute "
2035 "entry for '%s' in class file %s",
2036 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2037 CHECK_(nullHandle));
2038 }
2039 }
2040 }
2041
2042 // To merge LocalVariableTable and LocalVariableTypeTable
2043 Classfile_LVT_Element* cf_lvtt;
2044 LocalVariableTableElement lvtt_elem;
2045
2046 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2047 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2048 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2049 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2050 int index = hash(&lvtt_elem);
2051 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2052 if (entry == NULL) {
2053 if (_need_verify) {
2054 clear_hashtable(lvt_Hash);
2055 classfile_parse_error("LVTT entry for '%s' in class file %s "
2056 "does not match any LVT entry",
2057 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2058 CHECK_(nullHandle));
2059 }
2060 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2061 clear_hashtable(lvt_Hash);
2062 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2063 "entry for '%s' in class file %s",
2064 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2065 CHECK_(nullHandle));
2066 } else {
2067 // to add generic signatures into LocalVariableTable
2068 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2069 }
2070 }
2071 }
2072 clear_hashtable(lvt_Hash);
2073 }
2074
2075 *method_annotations = assemble_annotations(runtime_visible_annotations,
2076 runtime_visible_annotations_length,
2077 runtime_invisible_annotations,
2078 runtime_invisible_annotations_length,
2079 CHECK_(nullHandle));
2080 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2081 runtime_visible_parameter_annotations_length,
2082 runtime_invisible_parameter_annotations,
2083 runtime_invisible_parameter_annotations_length,
2084 CHECK_(nullHandle));
2085 *method_default_annotations = assemble_annotations(annotation_default,
2086 annotation_default_length,
2087 NULL,
2088 0,
2089 CHECK_(nullHandle));
2090
2091 if (name == vmSymbols::finalize_method_name() &&
2092 signature == vmSymbols::void_method_signature()) {
2093 if (m->is_empty_method()) {
2094 _has_empty_finalizer = true;
2095 } else {
2096 _has_finalizer = true;
2097 }
2098 }
2099 if (name == vmSymbols::object_initializer_name() &&
2100 signature == vmSymbols::void_method_signature() &&
2101 m->is_vanilla_constructor()) {
2102 _has_vanilla_constructor = true;
2103 }
2104
2105 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2106 m->is_method_handle_adapter())) {
2107 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2108 "Method handle invokers must be defined internally to the VM", nullHandle);
2109 }
2110
2111 return m;
2112 }
2113
2114
2115 // The promoted_flags parameter is used to pass relevant access_flags
2116 // from the methods back up to the containing klass. These flag values
2117 // are added to klass's access_flags.
2118
2119 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2120 AccessFlags* promoted_flags,
2121 bool* has_final_method,
2122 objArrayOop* methods_annotations_oop,
2123 objArrayOop* methods_parameter_annotations_oop,
2124 objArrayOop* methods_default_annotations_oop,
2125 TRAPS) {
2126 ClassFileStream* cfs = stream();
2127 objArrayHandle nullHandle;
2128 typeArrayHandle method_annotations;
2129 typeArrayHandle method_parameter_annotations;
2130 typeArrayHandle method_default_annotations;
2131 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2132 u2 length = cfs->get_u2_fast();
2133 if (length == 0) {
2134 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2135 } else {
2136 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2137 objArrayHandle methods(THREAD, m);
2138 HandleMark hm(THREAD);
2139 objArrayHandle methods_annotations;
2140 objArrayHandle methods_parameter_annotations;
2141 objArrayHandle methods_default_annotations;
2142 for (int index = 0; index < length; index++) {
2143 methodHandle method = parse_method(cp, is_interface,
2144 promoted_flags,
2145 &method_annotations,
2146 &method_parameter_annotations,
2147 &method_default_annotations,
2148 CHECK_(nullHandle));
2149 if (method->is_final()) {
2150 *has_final_method = true;
2151 }
2152 methods->obj_at_put(index, method());
2153 if (method_annotations.not_null()) {
2154 if (methods_annotations.is_null()) {
2155 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2156 methods_annotations = objArrayHandle(THREAD, md);
2157 }
2158 methods_annotations->obj_at_put(index, method_annotations());
2159 }
2160 if (method_parameter_annotations.not_null()) {
2161 if (methods_parameter_annotations.is_null()) {
2162 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2163 methods_parameter_annotations = objArrayHandle(THREAD, md);
2164 }
2165 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2166 }
2167 if (method_default_annotations.not_null()) {
2168 if (methods_default_annotations.is_null()) {
2169 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2170 methods_default_annotations = objArrayHandle(THREAD, md);
2171 }
2172 methods_default_annotations->obj_at_put(index, method_default_annotations());
2173 }
2174 }
2175 if (_need_verify && length > 1) {
2176 // Check duplicated methods
2177 ResourceMark rm(THREAD);
2178 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2179 THREAD, NameSigHash*, HASH_ROW_SIZE);
2180 initialize_hashtable(names_and_sigs);
2181 bool dup = false;
2182 {
2183 debug_only(No_Safepoint_Verifier nsv;)
2184 for (int i = 0; i < length; i++) {
2185 methodOop m = (methodOop)methods->obj_at(i);
2186 // If no duplicates, add name/signature in hashtable names_and_sigs.
2187 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2188 dup = true;
2189 break;
2190 }
2191 }
2192 }
2193 if (dup) {
2194 classfile_parse_error("Duplicate method name&signature in class file %s",
2195 CHECK_(nullHandle));
2196 }
2197 }
2198
2199 *methods_annotations_oop = methods_annotations();
2200 *methods_parameter_annotations_oop = methods_parameter_annotations();
2201 *methods_default_annotations_oop = methods_default_annotations();
2202
2203 return methods;
2204 }
2205 }
2206
2207
2208 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2209 objArrayHandle methods_annotations,
2210 objArrayHandle methods_parameter_annotations,
2211 objArrayHandle methods_default_annotations,
2212 TRAPS) {
2213 typeArrayHandle nullHandle;
2214 int length = methods()->length();
2215 // If JVMTI original method ordering is enabled we have to
2216 // remember the original class file ordering.
2217 // We temporarily use the vtable_index field in the methodOop to store the
2218 // class file index, so we can read in after calling qsort.
2219 if (JvmtiExport::can_maintain_original_method_order()) {
2220 for (int index = 0; index < length; index++) {
2221 methodOop m = methodOop(methods->obj_at(index));
2222 assert(!m->valid_vtable_index(), "vtable index should not be set");
2223 m->set_vtable_index(index);
2224 }
2225 }
2226 // Sort method array by ascending method name (for faster lookups & vtable construction)
2227 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2228 methodOopDesc::sort_methods(methods(),
2229 methods_annotations(),
2230 methods_parameter_annotations(),
2231 methods_default_annotations());
2232
2233 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2234 if (JvmtiExport::can_maintain_original_method_order()) {
2235 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2236 typeArrayHandle method_ordering(THREAD, new_ordering);
2237 for (int index = 0; index < length; index++) {
2238 methodOop m = methodOop(methods->obj_at(index));
2239 int old_index = m->vtable_index();
2240 assert(old_index >= 0 && old_index < length, "invalid method index");
2241 method_ordering->int_at_put(index, old_index);
2242 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2243 }
2244 return method_ordering;
2245 } else {
2246 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2247 }
2248 }
2249
2250
2251 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2252 ClassFileStream* cfs = stream();
2253 cfs->guarantee_more(2, CHECK); // sourcefile_index
2254 u2 sourcefile_index = cfs->get_u2_fast();
2255 check_property(
2256 valid_cp_range(sourcefile_index, cp->length()) &&
2257 cp->tag_at(sourcefile_index).is_utf8(),
2258 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2259 sourcefile_index, CHECK);
2260 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2261 }
2262
2263
2264
2265 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2266 instanceKlassHandle k,
2267 int length, TRAPS) {
2268 ClassFileStream* cfs = stream();
2269 u1* sde_buffer = cfs->get_u1_buffer();
2270 assert(sde_buffer != NULL, "null sde buffer");
2271
2272 // Don't bother storing it if there is no way to retrieve it
2273 if (JvmtiExport::can_get_source_debug_extension()) {
2274 // Optimistically assume that only 1 byte UTF format is used
2275 // (common case)
2276 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2277 k->set_source_debug_extension(sde_symbol);
2278 // Note that set_source_debug_extension() increments the reference count
2279 // for its copy of the Symbol*, so use a TempNewSymbol here.
2280 }
2281 // Got utf8 string, set stream position forward
2282 cfs->skip_u1(length, CHECK);
2283 }
2284
2285
2286 // Inner classes can be static, private or protected (classic VM does this)
2287 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2288
2289 // Return number of classes in the inner classes attribute table
2290 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2291 ClassFileStream* cfs = stream();
2292 cfs->guarantee_more(2, CHECK_0); // length
2293 u2 length = cfs->get_u2_fast();
2294
2295 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2296 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2297 typeArrayHandle inner_classes(THREAD, ic);
2298 int index = 0;
2299 int cp_size = cp->length();
2300 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2301 for (int n = 0; n < length; n++) {
2302 // Inner class index
2303 u2 inner_class_info_index = cfs->get_u2_fast();
2304 check_property(
2305 inner_class_info_index == 0 ||
2306 (valid_cp_range(inner_class_info_index, cp_size) &&
2307 is_klass_reference(cp, inner_class_info_index)),
2308 "inner_class_info_index %u has bad constant type in class file %s",
2309 inner_class_info_index, CHECK_0);
2310 // Outer class index
2311 u2 outer_class_info_index = cfs->get_u2_fast();
2312 check_property(
2313 outer_class_info_index == 0 ||
2314 (valid_cp_range(outer_class_info_index, cp_size) &&
2315 is_klass_reference(cp, outer_class_info_index)),
2316 "outer_class_info_index %u has bad constant type in class file %s",
2317 outer_class_info_index, CHECK_0);
2318 // Inner class name
2319 u2 inner_name_index = cfs->get_u2_fast();
2320 check_property(
2321 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2322 cp->tag_at(inner_name_index).is_utf8()),
2323 "inner_name_index %u has bad constant type in class file %s",
2324 inner_name_index, CHECK_0);
2325 if (_need_verify) {
2326 guarantee_property(inner_class_info_index != outer_class_info_index,
2327 "Class is both outer and inner class in class file %s", CHECK_0);
2328 }
2329 // Access flags
2330 AccessFlags inner_access_flags;
2331 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2332 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2333 // Set abstract bit for old class files for backward compatibility
2334 flags |= JVM_ACC_ABSTRACT;
2335 }
2336 verify_legal_class_modifiers(flags, CHECK_0);
2337 inner_access_flags.set_flags(flags);
2338
2339 inner_classes->short_at_put(index++, inner_class_info_index);
2340 inner_classes->short_at_put(index++, outer_class_info_index);
2341 inner_classes->short_at_put(index++, inner_name_index);
2342 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2343 }
2344
2345 // 4347400: make sure there's no duplicate entry in the classes array
2346 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2347 for(int i = 0; i < inner_classes->length(); i += 4) {
2348 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2349 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2350 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2351 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2352 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2353 "Duplicate entry in InnerClasses in class file %s",
2354 CHECK_0);
2355 }
2356 }
2357 }
2358
2359 // Update instanceKlass with inner class info.
2360 k->set_inner_classes(inner_classes());
2361 return length;
2362 }
2363
2364 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2365 k->set_is_synthetic();
2366 }
2367
2368 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2369 ClassFileStream* cfs = stream();
2370 u2 signature_index = cfs->get_u2(CHECK);
2371 check_property(
2372 valid_cp_range(signature_index, cp->length()) &&
2373 cp->tag_at(signature_index).is_utf8(),
2374 "Invalid constant pool index %u in Signature attribute in class file %s",
2375 signature_index, CHECK);
2376 k->set_generic_signature(cp->symbol_at(signature_index));
2377 }
2378
2379 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2380 u4 attribute_byte_length, TRAPS) {
2381 ClassFileStream* cfs = stream();
2382 u1* current_start = cfs->current();
2383
2384 cfs->guarantee_more(2, CHECK); // length
2385 int attribute_array_length = cfs->get_u2_fast();
2386
2387 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2388 "Short length on BootstrapMethods in class file %s",
2389 CHECK);
2390
2391 // The attribute contains a counted array of counted tuples of shorts,
2392 // represending bootstrap specifiers:
2393 // length*{bootstrap_method_index, argument_count*{argument_index}}
2394 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2395 // operand_count = number of shorts in attr, except for leading length
2396
2397 // The attribute is copied into a short[] array.
2398 // The array begins with a series of short[2] pairs, one for each tuple.
2399 int index_size = (attribute_array_length * 2);
2400
2401 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2402 typeArrayHandle operands(THREAD, operands_oop);
2403 operands_oop = NULL; // tidy
2404
2405 int operand_fill_index = index_size;
2406 int cp_size = cp->length();
2407
2408 for (int n = 0; n < attribute_array_length; n++) {
2409 // Store a 32-bit offset into the header of the operand array.
2410 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2411 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2412
2413 // Read a bootstrap specifier.
2414 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2415 u2 bootstrap_method_index = cfs->get_u2_fast();
2416 u2 argument_count = cfs->get_u2_fast();
2417 check_property(
2418 valid_cp_range(bootstrap_method_index, cp_size) &&
2419 cp->tag_at(bootstrap_method_index).is_method_handle(),
2420 "bootstrap_method_index %u has bad constant type in class file %s",
2421 bootstrap_method_index,
2422 CHECK);
2423 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2424 operands->short_at_put(operand_fill_index++, argument_count);
2425
2426 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2427 for (int j = 0; j < argument_count; j++) {
2428 u2 argument_index = cfs->get_u2_fast();
2429 check_property(
2430 valid_cp_range(argument_index, cp_size) &&
2431 cp->tag_at(argument_index).is_loadable_constant(),
2432 "argument_index %u has bad constant type in class file %s",
2433 argument_index,
2434 CHECK);
2435 operands->short_at_put(operand_fill_index++, argument_index);
2436 }
2437 }
2438
2439 assert(operand_fill_index == operands()->length(), "exact fill");
2440 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2441
2442 u1* current_end = cfs->current();
2443 guarantee_property(current_end == current_start + attribute_byte_length,
2444 "Bad length on BootstrapMethods in class file %s",
2445 CHECK);
2446
2447 cp->set_operands(operands());
2448 }
2449
2450
2451 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2452 ClassFileStream* cfs = stream();
2453 // Set inner classes attribute to default sentinel
2454 k->set_inner_classes(Universe::the_empty_short_array());
2455 cfs->guarantee_more(2, CHECK); // attributes_count
2456 u2 attributes_count = cfs->get_u2_fast();
2457 bool parsed_sourcefile_attribute = false;
2458 bool parsed_innerclasses_attribute = false;
2459 bool parsed_enclosingmethod_attribute = false;
2460 bool parsed_bootstrap_methods_attribute = false;
2461 u1* runtime_visible_annotations = NULL;
2462 int runtime_visible_annotations_length = 0;
2463 u1* runtime_invisible_annotations = NULL;
2464 int runtime_invisible_annotations_length = 0;
2465 // Iterate over attributes
2466 while (attributes_count--) {
2467 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2468 u2 attribute_name_index = cfs->get_u2_fast();
2469 u4 attribute_length = cfs->get_u4_fast();
2470 check_property(
2471 valid_cp_range(attribute_name_index, cp->length()) &&
2472 cp->tag_at(attribute_name_index).is_utf8(),
2473 "Attribute name has bad constant pool index %u in class file %s",
2474 attribute_name_index, CHECK);
2475 Symbol* tag = cp->symbol_at(attribute_name_index);
2476 if (tag == vmSymbols::tag_source_file()) {
2477 // Check for SourceFile tag
2478 if (_need_verify) {
2479 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2480 }
2481 if (parsed_sourcefile_attribute) {
2482 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2483 } else {
2484 parsed_sourcefile_attribute = true;
2485 }
2486 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2487 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2488 // Check for SourceDebugExtension tag
2489 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2490 } else if (tag == vmSymbols::tag_inner_classes()) {
2491 // Check for InnerClasses tag
2492 if (parsed_innerclasses_attribute) {
2493 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2494 } else {
2495 parsed_innerclasses_attribute = true;
2496 }
2497 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2498 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2499 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2500 "Wrong InnerClasses attribute length in class file %s", CHECK);
2501 }
2502 } else if (tag == vmSymbols::tag_synthetic()) {
2503 // Check for Synthetic tag
2504 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2505 if (attribute_length != 0) {
2506 classfile_parse_error(
2507 "Invalid Synthetic classfile attribute length %u in class file %s",
2508 attribute_length, CHECK);
2509 }
2510 parse_classfile_synthetic_attribute(cp, k, CHECK);
2511 } else if (tag == vmSymbols::tag_deprecated()) {
2512 // Check for Deprecatd tag - 4276120
2513 if (attribute_length != 0) {
2514 classfile_parse_error(
2515 "Invalid Deprecated classfile attribute length %u in class file %s",
2516 attribute_length, CHECK);
2517 }
2518 } else if (_major_version >= JAVA_1_5_VERSION) {
2519 if (tag == vmSymbols::tag_signature()) {
2520 if (attribute_length != 2) {
2521 classfile_parse_error(
2522 "Wrong Signature attribute length %u in class file %s",
2523 attribute_length, CHECK);
2524 }
2525 parse_classfile_signature_attribute(cp, k, CHECK);
2526 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2527 runtime_visible_annotations_length = attribute_length;
2528 runtime_visible_annotations = cfs->get_u1_buffer();
2529 assert(runtime_visible_annotations != NULL, "null visible annotations");
2530 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2531 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2532 runtime_invisible_annotations_length = attribute_length;
2533 runtime_invisible_annotations = cfs->get_u1_buffer();
2534 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2535 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2536 } else if (tag == vmSymbols::tag_enclosing_method()) {
2537 if (parsed_enclosingmethod_attribute) {
2538 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2539 } else {
2540 parsed_enclosingmethod_attribute = true;
2541 }
2542 cfs->guarantee_more(4, CHECK); // class_index, method_index
2543 u2 class_index = cfs->get_u2_fast();
2544 u2 method_index = cfs->get_u2_fast();
2545 if (class_index == 0) {
2546 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2547 }
2548 // Validate the constant pool indices and types
2549 if (!cp->is_within_bounds(class_index) ||
2550 !is_klass_reference(cp, class_index)) {
2551 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2552 }
2553 if (method_index != 0 &&
2554 (!cp->is_within_bounds(method_index) ||
2555 !cp->tag_at(method_index).is_name_and_type())) {
2556 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2557 }
2558 k->set_enclosing_method_indices(class_index, method_index);
2559 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2560 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2561 if (parsed_bootstrap_methods_attribute)
2562 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2563 parsed_bootstrap_methods_attribute = true;
2564 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2565 } else {
2566 // Unknown attribute
2567 cfs->skip_u1(attribute_length, CHECK);
2568 }
2569 } else {
2570 // Unknown attribute
2571 cfs->skip_u1(attribute_length, CHECK);
2572 }
2573 }
2574 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2575 runtime_visible_annotations_length,
2576 runtime_invisible_annotations,
2577 runtime_invisible_annotations_length,
2578 CHECK);
2579 k->set_class_annotations(annotations());
2580
2581 if (_max_bootstrap_specifier_index >= 0) {
2582 guarantee_property(parsed_bootstrap_methods_attribute,
2583 "Missing BootstrapMethods attribute in class file %s", CHECK);
2584 }
2585 }
2586
2587
2588 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2589 int runtime_visible_annotations_length,
2590 u1* runtime_invisible_annotations,
2591 int runtime_invisible_annotations_length, TRAPS) {
2592 typeArrayHandle annotations;
2593 if (runtime_visible_annotations != NULL ||
2594 runtime_invisible_annotations != NULL) {
2595 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2596 runtime_invisible_annotations_length, CHECK_(annotations));
2597 annotations = typeArrayHandle(THREAD, anno);
2598 if (runtime_visible_annotations != NULL) {
2599 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2600 }
2601 if (runtime_invisible_annotations != NULL) {
2602 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2603 }
2604 }
2605 return annotations;
2606 }
2607
2608
2609 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2610 KlassHandle h_k (THREAD, fd->field_holder());
2611 assert(h_k.not_null() && fd->is_static(), "just checking");
2612 if (fd->has_initial_value()) {
2613 BasicType t = fd->field_type();
2614 switch (t) {
2615 case T_BYTE:
2616 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2617 break;
2618 case T_BOOLEAN:
2619 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2620 break;
2621 case T_CHAR:
2622 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2623 break;
2624 case T_SHORT:
2625 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2626 break;
2627 case T_INT:
2628 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2629 break;
2630 case T_FLOAT:
2631 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2632 break;
2633 case T_DOUBLE:
2634 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2635 break;
2636 case T_LONG:
2637 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2638 break;
2639 case T_OBJECT:
2640 {
2641 #ifdef ASSERT
2642 TempNewSymbol sym = SymbolTable::new_symbol("Ljava/lang/String;", CHECK);
2643 assert(fd->signature() == sym, "just checking");
2644 #endif
2645 oop string = fd->string_initial_value(CHECK);
2646 h_k()->obj_field_put(fd->offset(), string);
2647 }
2648 break;
2649 default:
2650 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2651 "Illegal ConstantValue attribute in class file");
2652 }
2653 }
2654 }
2655
2656
2657 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2658 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2659 // This code is for compatibility with earlier jdk's that do not
2660 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2661 // the check for the "discovered" field should issue a warning if
2662 // the field is not found. For 1.6 this code should be issue a
2663 // fatal error if the "discovered" field is not found.
2664 //
2665 // Increment fac.nonstatic_oop_count so that the start of the
2666 // next type of non-static oops leaves room for the fake oop.
2667 // Do not increment next_nonstatic_oop_offset so that the
2668 // fake oop is place after the java.lang.ref.Reference oop
2669 // fields.
2670 //
2671 // Check the fields in java.lang.ref.Reference for the "discovered"
2672 // field. If it is not present, artifically create a field for it.
2673 // This allows this VM to run on early JDK where the field is not
2674 // present.
2675 int reference_sig_index = 0;
2676 int reference_name_index = 0;
2677 int reference_index = 0;
2678 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2679 const int n = (*fields_ptr)()->length();
2680 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2681 int name_index =
2682 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2683 int sig_index =
2684 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2685 Symbol* f_name = cp->symbol_at(name_index);
2686 Symbol* f_sig = cp->symbol_at(sig_index);
2687 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2688 // Save the index for reference signature for later use.
2689 // The fake discovered field does not entries in the
2690 // constant pool so the index for its signature cannot
2691 // be extracted from the constant pool. It will need
2692 // later, however. It's signature is vmSymbols::reference_signature()
2693 // so same an index for that signature.
2694 reference_sig_index = sig_index;
2695 reference_name_index = name_index;
2696 reference_index = i;
2697 }
2698 if (f_name == vmSymbols::reference_discovered_name() &&
2699 f_sig == vmSymbols::reference_signature()) {
2700 // The values below are fake but will force extra
2701 // non-static oop fields and a corresponding non-static
2702 // oop map block to be allocated.
2703 extra = 0;
2704 break;
2705 }
2706 }
2707 if (extra != 0) {
2708 fac_ptr->nonstatic_oop_count += extra;
2709 // Add the additional entry to "fields" so that the klass
2710 // contains the "discoverd" field and the field will be initialized
2711 // in instances of the object.
2712 int fields_with_fix_length = (*fields_ptr)()->length() +
2713 instanceKlass::next_offset;
2714 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2715 fields_with_fix_length, CHECK);
2716 typeArrayHandle fields_with_fix(THREAD, ff);
2717
2718 // Take everything from the original but the length.
2719 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2720 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2721 }
2722
2723 // Add the fake field at the end.
2724 int i = (*fields_ptr)->length();
2725 // There is no name index for the fake "discovered" field nor
2726 // signature but a signature is needed so that the field will
2727 // be properly initialized. Use one found for
2728 // one of the other reference fields. Be sure the index for the
2729 // name is 0. In fieldDescriptor::initialize() the index of the
2730 // name is checked. That check is by passed for the last nonstatic
2731 // oop field in a java.lang.ref.Reference which is assumed to be
2732 // this artificial "discovered" field. An assertion checks that
2733 // the name index is 0.
2734 assert(reference_index != 0, "Missing signature for reference");
2735
2736 int j;
2737 for (j = 0; j < instanceKlass::next_offset; j++) {
2738 fields_with_fix->ushort_at_put(i + j,
2739 (*fields_ptr)->ushort_at(reference_index +j));
2740 }
2741 // Clear the public access flag and set the private access flag.
2742 short flags;
2743 flags =
2744 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2745 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2746 flags = flags & (~JVM_ACC_PUBLIC);
2747 flags = flags | JVM_ACC_PRIVATE;
2748 AccessFlags access_flags;
2749 access_flags.set_flags(flags);
2750 assert(!access_flags.is_public(), "Failed to clear public flag");
2751 assert(access_flags.is_private(), "Failed to set private flag");
2752 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2753 flags);
2754
2755 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2756 == reference_name_index, "The fake reference name is incorrect");
2757 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2758 == reference_sig_index, "The fake reference signature is incorrect");
2759 // The type of the field is stored in the low_offset entry during
2760 // parsing.
2761 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2762 NONSTATIC_OOP, "The fake reference type is incorrect");
2763
2764 // "fields" is allocated in the permanent generation. Disgard
2765 // it and let it be collected.
2766 (*fields_ptr) = fields_with_fix;
2767 }
2768 return;
2769 }
2770
2771
2772 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2773 FieldAllocationCount *fac_ptr, TRAPS) {
2774 // Add fake fields for java.lang.Class instances
2775 //
2776 // This is not particularly nice. We should consider adding a
2777 // private transient object field at the Java level to
2778 // java.lang.Class. Alternatively we could add a subclass of
2779 // instanceKlass which provides an accessor and size computer for
2780 // this field, but that appears to be more code than this hack.
2781 //
2782 // NOTE that we wedge these in at the beginning rather than the
2783 // end of the object because the Class layout changed between JDK
2784 // 1.3 and JDK 1.4 with the new reflection implementation; some
2785 // nonstatic oop fields were added at the Java level. The offsets
2786 // of these fake fields can't change between these two JDK
2787 // versions because when the offsets are computed at bootstrap
2788 // time we don't know yet which version of the JDK we're running in.
2789
2790 // The values below are fake but will force two non-static oop fields and
2791 // a corresponding non-static oop map block to be allocated.
2792 const int extra = java_lang_Class::number_of_fake_oop_fields;
2793 fac_ptr->nonstatic_oop_count += extra;
2794 }
2795
2796
2797 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2798 // Cause the extra fake fields in java.lang.Class to show up before
2799 // the Java fields for layout compatibility between 1.3 and 1.4
2800 // Incrementing next_nonstatic_oop_offset here advances the
2801 // location where the real java fields are placed.
2802 const int extra = java_lang_Class::number_of_fake_oop_fields;
2803 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2804 }
2805
2806
2807 // Force MethodHandle.vmentry to be an unmanaged pointer.
2808 // There is no way for a classfile to express this, so we must help it.
2809 void ClassFileParser::java_lang_invoke_MethodHandle_fix_pre(constantPoolHandle cp,
2810 typeArrayHandle fields,
2811 FieldAllocationCount *fac_ptr,
2812 TRAPS) {
2813 // Add fake fields for java.lang.invoke.MethodHandle instances
2814 //
2815 // This is not particularly nice, but since there is no way to express
2816 // a native wordSize field in Java, we must do it at this level.
2817
2818 if (!EnableMethodHandles) return;
2819
2820 int word_sig_index = 0;
2821 const int cp_size = cp->length();
2822 for (int index = 1; index < cp_size; index++) {
2823 if (cp->tag_at(index).is_utf8() &&
2824 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2825 word_sig_index = index;
2826 break;
2827 }
2828 }
2829
2830 if (AllowTransitionalJSR292 && word_sig_index == 0) return;
2831 if (word_sig_index == 0)
2832 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2833 "missing I or J signature (for vmentry) in java.lang.invoke.MethodHandle");
2834
2835 // Find vmentry field and change the signature.
2836 bool found_vmentry = false;
2837 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) {
2838 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
2839 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
2840 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset);
2841 Symbol* f_name = cp->symbol_at(name_index);
2842 Symbol* f_sig = cp->symbol_at(sig_index);
2843 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) {
2844 if (f_sig == vmSymbols::machine_word_signature()) {
2845 // If the signature of vmentry is already changed, we're done.
2846 found_vmentry = true;
2847 break;
2848 }
2849 else if (f_sig == vmSymbols::byte_signature()) {
2850 // Adjust the field type from byte to an unmanaged pointer.
2851 assert(fac_ptr->nonstatic_byte_count > 0, "");
2852 fac_ptr->nonstatic_byte_count -= 1;
2853
2854 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2855 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2856 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2857 else fac_ptr->nonstatic_word_count += 1;
2858
2859 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
2860 assert(atype == NONSTATIC_BYTE, "");
2861 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2862 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2863
2864 found_vmentry = true;
2865 break;
2866 }
2867 }
2868 }
2869
2870 if (AllowTransitionalJSR292 && !found_vmentry) return;
2871 if (!found_vmentry)
2872 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2873 "missing vmentry byte field in java.lang.invoke.MethodHandle");
2874 }
2875
2876
2877 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2878 Handle class_loader,
2879 Handle protection_domain,
2880 KlassHandle host_klass,
2881 GrowableArray<Handle>* cp_patches,
2882 TempNewSymbol& parsed_name,
2883 bool verify,
2884 TRAPS) {
2885 // So that JVMTI can cache class file in the state before retransformable agents
2886 // have modified it
2887 unsigned char *cached_class_file_bytes = NULL;
2888 jint cached_class_file_length;
2889
2890 ClassFileStream* cfs = stream();
2891 // Timing
2892 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2893 JavaThread* jt = (JavaThread*) THREAD;
2894
2895 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2896 ClassLoader::perf_class_parse_selftime(),
2897 NULL,
2898 jt->get_thread_stat()->perf_recursion_counts_addr(),
2899 jt->get_thread_stat()->perf_timers_addr(),
2900 PerfClassTraceTime::PARSE_CLASS);
2901
2902 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2903 _max_bootstrap_specifier_index = -1;
2904
2905 if (JvmtiExport::should_post_class_file_load_hook()) {
2906 unsigned char* ptr = cfs->buffer();
2907 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2908
2909 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2910 &ptr, &end_ptr,
2911 &cached_class_file_bytes,
2912 &cached_class_file_length);
2913
2914 if (ptr != cfs->buffer()) {
2915 // JVMTI agent has modified class file data.
2916 // Set new class file stream using JVMTI agent modified
2917 // class file data.
2918 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2919 set_stream(cfs);
2920 }
2921 }
2922
2923 _host_klass = host_klass;
2924 _cp_patches = cp_patches;
2925
2926 instanceKlassHandle nullHandle;
2927
2928 // Figure out whether we can skip format checking (matching classic VM behavior)
2929 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2930
2931 // Set the verify flag in stream
2932 cfs->set_verify(_need_verify);
2933
2934 // Save the class file name for easier error message printing.
2935 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2936
2937 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2938 // Magic value
2939 u4 magic = cfs->get_u4_fast();
2940 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2941 "Incompatible magic value %u in class file %s",
2942 magic, CHECK_(nullHandle));
2943
2944 // Version numbers
2945 u2 minor_version = cfs->get_u2_fast();
2946 u2 major_version = cfs->get_u2_fast();
2947
2948 // Check version numbers - we check this even with verifier off
2949 if (!is_supported_version(major_version, minor_version)) {
2950 if (name == NULL) {
2951 Exceptions::fthrow(
2952 THREAD_AND_LOCATION,
2953 vmSymbols::java_lang_UnsupportedClassVersionError(),
2954 "Unsupported major.minor version %u.%u",
2955 major_version,
2956 minor_version);
2957 } else {
2958 ResourceMark rm(THREAD);
2959 Exceptions::fthrow(
2960 THREAD_AND_LOCATION,
2961 vmSymbols::java_lang_UnsupportedClassVersionError(),
2962 "%s : Unsupported major.minor version %u.%u",
2963 name->as_C_string(),
2964 major_version,
2965 minor_version);
2966 }
2967 return nullHandle;
2968 }
2969
2970 _major_version = major_version;
2971 _minor_version = minor_version;
2972
2973
2974 // Check if verification needs to be relaxed for this class file
2975 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2976 _relax_verify = Verifier::relax_verify_for(class_loader());
2977
2978 // Constant pool
2979 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2980 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2981
2982 int cp_size = cp->length();
2983
2984 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2985
2986 // Access flags
2987 AccessFlags access_flags;
2988 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2989
2990 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2991 // Set abstract bit for old class files for backward compatibility
2992 flags |= JVM_ACC_ABSTRACT;
2993 }
2994 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2995 access_flags.set_flags(flags);
2996
2997 // This class and superclass
2998 instanceKlassHandle super_klass;
2999 u2 this_class_index = cfs->get_u2_fast();
3000 check_property(
3001 valid_cp_range(this_class_index, cp_size) &&
3002 cp->tag_at(this_class_index).is_unresolved_klass(),
3003 "Invalid this class index %u in constant pool in class file %s",
3004 this_class_index, CHECK_(nullHandle));
3005
3006 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3007 assert(class_name != NULL, "class_name can't be null");
3008
3009 // It's important to set parsed_name *before* resolving the super class.
3010 // (it's used for cleanup by the caller if parsing fails)
3011 parsed_name = class_name;
3012 // parsed_name is returned and can be used if there's an error, so add to
3013 // its reference count. Caller will decrement the refcount.
3014 parsed_name->increment_refcount();
3015
3016 // Update _class_name which could be null previously to be class_name
3017 _class_name = class_name;
3018
3019 // Don't need to check whether this class name is legal or not.
3020 // It has been checked when constant pool is parsed.
3021 // However, make sure it is not an array type.
3022 if (_need_verify) {
3023 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3024 "Bad class name in class file %s",
3025 CHECK_(nullHandle));
3026 }
3027
3028 klassOop preserve_this_klass; // for storing result across HandleMark
3029
3030 // release all handles when parsing is done
3031 { HandleMark hm(THREAD);
3032
3033 // Checks if name in class file matches requested name
3034 if (name != NULL && class_name != name) {
3035 ResourceMark rm(THREAD);
3036 Exceptions::fthrow(
3037 THREAD_AND_LOCATION,
3038 vmSymbols::java_lang_NoClassDefFoundError(),
3039 "%s (wrong name: %s)",
3040 name->as_C_string(),
3041 class_name->as_C_string()
3042 );
3043 return nullHandle;
3044 }
3045
3046 if (TraceClassLoadingPreorder) {
3047 tty->print("[Loading %s", name->as_klass_external_name());
3048 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3049 tty->print_cr("]");
3050 }
3051
3052 u2 super_class_index = cfs->get_u2_fast();
3053 if (super_class_index == 0) {
3054 check_property(class_name == vmSymbols::java_lang_Object(),
3055 "Invalid superclass index %u in class file %s",
3056 super_class_index,
3057 CHECK_(nullHandle));
3058 } else {
3059 check_property(valid_cp_range(super_class_index, cp_size) &&
3060 is_klass_reference(cp, super_class_index),
3061 "Invalid superclass index %u in class file %s",
3062 super_class_index,
3063 CHECK_(nullHandle));
3064 // The class name should be legal because it is checked when parsing constant pool.
3065 // However, make sure it is not an array type.
3066 bool is_array = false;
3067 if (cp->tag_at(super_class_index).is_klass()) {
3068 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3069 if (_need_verify)
3070 is_array = super_klass->oop_is_array();
3071 } else if (_need_verify) {
3072 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3073 }
3074 if (_need_verify) {
3075 guarantee_property(!is_array,
3076 "Bad superclass name in class file %s", CHECK_(nullHandle));
3077 }
3078 }
3079
3080 // Interfaces
3081 u2 itfs_len = cfs->get_u2_fast();
3082 objArrayHandle local_interfaces;
3083 if (itfs_len == 0) {
3084 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3085 } else {
3086 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3087 }
3088
3089 // Fields (offsets are filled in later)
3090 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
3091 objArrayHandle fields_annotations;
3092 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
3093 // Methods
3094 bool has_final_method = false;
3095 AccessFlags promoted_flags;
3096 promoted_flags.set_flags(0);
3097 // These need to be oop pointers because they are allocated lazily
3098 // inside parse_methods inside a nested HandleMark
3099 objArrayOop methods_annotations_oop = NULL;
3100 objArrayOop methods_parameter_annotations_oop = NULL;
3101 objArrayOop methods_default_annotations_oop = NULL;
3102 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3103 &promoted_flags,
3104 &has_final_method,
3105 &methods_annotations_oop,
3106 &methods_parameter_annotations_oop,
3107 &methods_default_annotations_oop,
3108 CHECK_(nullHandle));
3109
3110 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3111 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3112 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3113
3114 // We check super class after class file is parsed and format is checked
3115 if (super_class_index > 0 && super_klass.is_null()) {
3116 Symbol* sk = cp->klass_name_at(super_class_index);
3117 if (access_flags.is_interface()) {
3118 // Before attempting to resolve the superclass, check for class format
3119 // errors not checked yet.
3120 guarantee_property(sk == vmSymbols::java_lang_Object(),
3121 "Interfaces must have java.lang.Object as superclass in class file %s",
3122 CHECK_(nullHandle));
3123 }
3124 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3125 sk,
3126 class_loader,
3127 protection_domain,
3128 true,
3129 CHECK_(nullHandle));
3130
3131 KlassHandle kh (THREAD, k);
3132 super_klass = instanceKlassHandle(THREAD, kh());
3133 if (LinkWellKnownClasses) // my super class is well known to me
3134 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3135 }
3136 if (super_klass.not_null()) {
3137 if (super_klass->is_interface()) {
3138 ResourceMark rm(THREAD);
3139 Exceptions::fthrow(
3140 THREAD_AND_LOCATION,
3141 vmSymbols::java_lang_IncompatibleClassChangeError(),
3142 "class %s has interface %s as super class",
3143 class_name->as_klass_external_name(),
3144 super_klass->external_name()
3145 );
3146 return nullHandle;
3147 }
3148 // Make sure super class is not final
3149 if (super_klass->is_final()) {
3150 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3151 }
3152 }
3153
3154 // Compute the transitive list of all unique interfaces implemented by this class
3155 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3156
3157 // sort methods
3158 typeArrayHandle method_ordering = sort_methods(methods,
3159 methods_annotations,
3160 methods_parameter_annotations,
3161 methods_default_annotations,
3162 CHECK_(nullHandle));
3163
3164 // promote flags from parse_methods() to the klass' flags
3165 access_flags.add_promoted_flags(promoted_flags.as_int());
3166
3167 // Size of Java vtable (in words)
3168 int vtable_size = 0;
3169 int itable_size = 0;
3170 int num_miranda_methods = 0;
3171
3172 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3173 num_miranda_methods,
3174 super_klass(),
3175 methods(),
3176 access_flags,
3177 class_loader,
3178 class_name,
3179 local_interfaces(),
3180 CHECK_(nullHandle));
3181
3182 // Size of Java itable (in words)
3183 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3184
3185 // Field size and offset computation
3186 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3187 #ifndef PRODUCT
3188 int orig_nonstatic_field_size = 0;
3189 #endif
3190 int static_field_size = 0;
3191 int next_static_oop_offset;
3192 int next_static_double_offset;
3193 int next_static_word_offset;
3194 int next_static_short_offset;
3195 int next_static_byte_offset;
3196 int next_static_type_offset;
3197 int next_nonstatic_oop_offset;
3198 int next_nonstatic_double_offset;
3199 int next_nonstatic_word_offset;
3200 int next_nonstatic_short_offset;
3201 int next_nonstatic_byte_offset;
3202 int next_nonstatic_type_offset;
3203 int first_nonstatic_oop_offset;
3204 int first_nonstatic_field_offset;
3205 int next_nonstatic_field_offset;
3206
3207 // Calculate the starting byte offsets
3208 next_static_oop_offset = (instanceKlass::header_size() +
3209 align_object_offset(vtable_size) +
3210 align_object_offset(itable_size)) * wordSize;
3211 next_static_double_offset = next_static_oop_offset +
3212 (fac.static_oop_count * heapOopSize);
3213 if ( fac.static_double_count &&
3214 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3215 Universe::field_type_should_be_aligned(T_LONG)) ) {
3216 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3217 }
3218
3219 next_static_word_offset = next_static_double_offset +
3220 (fac.static_double_count * BytesPerLong);
3221 next_static_short_offset = next_static_word_offset +
3222 (fac.static_word_count * BytesPerInt);
3223 next_static_byte_offset = next_static_short_offset +
3224 (fac.static_short_count * BytesPerShort);
3225 next_static_type_offset = align_size_up((next_static_byte_offset +
3226 fac.static_byte_count ), wordSize );
3227 static_field_size = (next_static_type_offset -
3228 next_static_oop_offset) / wordSize;
3229 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3230 nonstatic_field_size * heapOopSize;
3231 next_nonstatic_field_offset = first_nonstatic_field_offset;
3232
3233 // Add fake fields for java.lang.Class instances (also see below)
3234 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3235 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3236 }
3237
3238 // adjust the vmentry field declaration in java.lang.invoke.MethodHandle
3239 if (EnableMethodHandles && class_name == vmSymbols::java_lang_invoke_MethodHandle() && class_loader.is_null()) {
3240 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3241 }
3242 if (AllowTransitionalJSR292 &&
3243 EnableMethodHandles && class_name == vmSymbols::java_dyn_MethodHandle() && class_loader.is_null()) {
3244 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3245 }
3246 if (AllowTransitionalJSR292 &&
3247 EnableMethodHandles && class_name == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3248 // allow vmentry field in MethodHandleImpl also
3249 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3250 }
3251
3252 // Add a fake "discovered" field if it is not present
3253 // for compatibility with earlier jdk's.
3254 if (class_name == vmSymbols::java_lang_ref_Reference()
3255 && class_loader.is_null()) {
3256 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3257 }
3258 // end of "discovered" field compactibility fix
3259
3260 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3261 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3262 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3263 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3264 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3265
3266 bool super_has_nonstatic_fields =
3267 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3268 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3269 ((nonstatic_double_count + nonstatic_word_count +
3270 nonstatic_short_count + nonstatic_byte_count +
3271 nonstatic_oop_count) != 0);
3272
3273
3274 // Prepare list of oops for oop map generation.
3275 int* nonstatic_oop_offsets;
3276 unsigned int* nonstatic_oop_counts;
3277 unsigned int nonstatic_oop_map_count = 0;
3278
3279 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3280 THREAD, int, nonstatic_oop_count + 1);
3281 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3282 THREAD, unsigned int, nonstatic_oop_count + 1);
3283
3284 // Add fake fields for java.lang.Class instances (also see above).
3285 // FieldsAllocationStyle and CompactFields values will be reset to default.
3286 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3287 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3288 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3289 const uint fake_oop_count = (next_nonstatic_field_offset -
3290 first_nonstatic_field_offset) / heapOopSize;
3291 nonstatic_oop_counts[0] = fake_oop_count;
3292 nonstatic_oop_map_count = 1;
3293 nonstatic_oop_count -= fake_oop_count;
3294 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3295 } else {
3296 first_nonstatic_oop_offset = 0; // will be set for first oop field
3297 }
3298
3299 #ifndef PRODUCT
3300 if( PrintCompactFieldsSavings ) {
3301 next_nonstatic_double_offset = next_nonstatic_field_offset +
3302 (nonstatic_oop_count * heapOopSize);
3303 if ( nonstatic_double_count > 0 ) {
3304 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3305 }
3306 next_nonstatic_word_offset = next_nonstatic_double_offset +
3307 (nonstatic_double_count * BytesPerLong);
3308 next_nonstatic_short_offset = next_nonstatic_word_offset +
3309 (nonstatic_word_count * BytesPerInt);
3310 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3311 (nonstatic_short_count * BytesPerShort);
3312 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3313 nonstatic_byte_count ), heapOopSize );
3314 orig_nonstatic_field_size = nonstatic_field_size +
3315 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3316 }
3317 #endif
3318 bool compact_fields = CompactFields;
3319 int allocation_style = FieldsAllocationStyle;
3320 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3321 assert(false, "0 <= FieldsAllocationStyle <= 2");
3322 allocation_style = 1; // Optimistic
3323 }
3324
3325 // The next classes have predefined hard-coded fields offsets
3326 // (see in JavaClasses::compute_hard_coded_offsets()).
3327 // Use default fields allocation order for them.
3328 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3329 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3330 class_name == vmSymbols::java_lang_Class() ||
3331 class_name == vmSymbols::java_lang_ClassLoader() ||
3332 class_name == vmSymbols::java_lang_ref_Reference() ||
3333 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3334 class_name == vmSymbols::java_lang_StackTraceElement() ||
3335 class_name == vmSymbols::java_lang_String() ||
3336 class_name == vmSymbols::java_lang_Throwable() ||
3337 class_name == vmSymbols::java_lang_Boolean() ||
3338 class_name == vmSymbols::java_lang_Character() ||
3339 class_name == vmSymbols::java_lang_Float() ||
3340 class_name == vmSymbols::java_lang_Double() ||
3341 class_name == vmSymbols::java_lang_Byte() ||
3342 class_name == vmSymbols::java_lang_Short() ||
3343 class_name == vmSymbols::java_lang_Integer() ||
3344 class_name == vmSymbols::java_lang_Long())) {
3345 allocation_style = 0; // Allocate oops first
3346 compact_fields = false; // Don't compact fields
3347 }
3348
3349 if( allocation_style == 0 ) {
3350 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3351 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3352 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3353 (nonstatic_oop_count * heapOopSize);
3354 } else if( allocation_style == 1 ) {
3355 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3356 next_nonstatic_double_offset = next_nonstatic_field_offset;
3357 } else if( allocation_style == 2 ) {
3358 // Fields allocation: oops fields in super and sub classes are together.
3359 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3360 super_klass->nonstatic_oop_map_size() > 0 ) {
3361 int map_size = super_klass->nonstatic_oop_map_size();
3362 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3363 OopMapBlock* last_map = first_map + map_size - 1;
3364 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3365 if (next_offset == next_nonstatic_field_offset) {
3366 allocation_style = 0; // allocate oops first
3367 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3368 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3369 (nonstatic_oop_count * heapOopSize);
3370 }
3371 }
3372 if( allocation_style == 2 ) {
3373 allocation_style = 1; // allocate oops last
3374 next_nonstatic_double_offset = next_nonstatic_field_offset;
3375 }
3376 } else {
3377 ShouldNotReachHere();
3378 }
3379
3380 int nonstatic_oop_space_count = 0;
3381 int nonstatic_word_space_count = 0;
3382 int nonstatic_short_space_count = 0;
3383 int nonstatic_byte_space_count = 0;
3384 int nonstatic_oop_space_offset;
3385 int nonstatic_word_space_offset;
3386 int nonstatic_short_space_offset;
3387 int nonstatic_byte_space_offset;
3388
3389 if( nonstatic_double_count > 0 ) {
3390 int offset = next_nonstatic_double_offset;
3391 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3392 if( compact_fields && offset != next_nonstatic_double_offset ) {
3393 // Allocate available fields into the gap before double field.
3394 int length = next_nonstatic_double_offset - offset;
3395 assert(length == BytesPerInt, "");
3396 nonstatic_word_space_offset = offset;
3397 if( nonstatic_word_count > 0 ) {
3398 nonstatic_word_count -= 1;
3399 nonstatic_word_space_count = 1; // Only one will fit
3400 length -= BytesPerInt;
3401 offset += BytesPerInt;
3402 }
3403 nonstatic_short_space_offset = offset;
3404 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3405 nonstatic_short_count -= 1;
3406 nonstatic_short_space_count += 1;
3407 length -= BytesPerShort;
3408 offset += BytesPerShort;
3409 }
3410 nonstatic_byte_space_offset = offset;
3411 while( length > 0 && nonstatic_byte_count > 0 ) {
3412 nonstatic_byte_count -= 1;
3413 nonstatic_byte_space_count += 1;
3414 length -= 1;
3415 }
3416 // Allocate oop field in the gap if there are no other fields for that.
3417 nonstatic_oop_space_offset = offset;
3418 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3419 allocation_style != 0 ) { // when oop fields not first
3420 nonstatic_oop_count -= 1;
3421 nonstatic_oop_space_count = 1; // Only one will fit
3422 length -= heapOopSize;
3423 offset += heapOopSize;
3424 }
3425 }
3426 }
3427
3428 next_nonstatic_word_offset = next_nonstatic_double_offset +
3429 (nonstatic_double_count * BytesPerLong);
3430 next_nonstatic_short_offset = next_nonstatic_word_offset +
3431 (nonstatic_word_count * BytesPerInt);
3432 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3433 (nonstatic_short_count * BytesPerShort);
3434
3435 int notaligned_offset;
3436 if( allocation_style == 0 ) {
3437 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3438 } else { // allocation_style == 1
3439 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3440 if( nonstatic_oop_count > 0 ) {
3441 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3442 }
3443 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3444 }
3445 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3446 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3447 - first_nonstatic_field_offset)/heapOopSize);
3448
3449 // Iterate over fields again and compute correct offsets.
3450 // The field allocation type was temporarily stored in the offset slot.
3451 // oop fields are located before non-oop fields (static and non-static).
3452 int len = fields->length();
3453 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3454 int real_offset;
3455 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3456 switch (atype) {
3457 case STATIC_OOP:
3458 real_offset = next_static_oop_offset;
3459 next_static_oop_offset += heapOopSize;
3460 break;
3461 case STATIC_BYTE:
3462 real_offset = next_static_byte_offset;
3463 next_static_byte_offset += 1;
3464 break;
3465 case STATIC_SHORT:
3466 real_offset = next_static_short_offset;
3467 next_static_short_offset += BytesPerShort;
3468 break;
3469 case STATIC_WORD:
3470 real_offset = next_static_word_offset;
3471 next_static_word_offset += BytesPerInt;
3472 break;
3473 case STATIC_ALIGNED_DOUBLE:
3474 case STATIC_DOUBLE:
3475 real_offset = next_static_double_offset;
3476 next_static_double_offset += BytesPerLong;
3477 break;
3478 case NONSTATIC_OOP:
3479 if( nonstatic_oop_space_count > 0 ) {
3480 real_offset = nonstatic_oop_space_offset;
3481 nonstatic_oop_space_offset += heapOopSize;
3482 nonstatic_oop_space_count -= 1;
3483 } else {
3484 real_offset = next_nonstatic_oop_offset;
3485 next_nonstatic_oop_offset += heapOopSize;
3486 }
3487 // Update oop maps
3488 if( nonstatic_oop_map_count > 0 &&
3489 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3490 real_offset -
3491 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3492 heapOopSize ) {
3493 // Extend current oop map
3494 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3495 } else {
3496 // Create new oop map
3497 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3498 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3499 nonstatic_oop_map_count += 1;
3500 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3501 first_nonstatic_oop_offset = real_offset;
3502 }
3503 }
3504 break;
3505 case NONSTATIC_BYTE:
3506 if( nonstatic_byte_space_count > 0 ) {
3507 real_offset = nonstatic_byte_space_offset;
3508 nonstatic_byte_space_offset += 1;
3509 nonstatic_byte_space_count -= 1;
3510 } else {
3511 real_offset = next_nonstatic_byte_offset;
3512 next_nonstatic_byte_offset += 1;
3513 }
3514 break;
3515 case NONSTATIC_SHORT:
3516 if( nonstatic_short_space_count > 0 ) {
3517 real_offset = nonstatic_short_space_offset;
3518 nonstatic_short_space_offset += BytesPerShort;
3519 nonstatic_short_space_count -= 1;
3520 } else {
3521 real_offset = next_nonstatic_short_offset;
3522 next_nonstatic_short_offset += BytesPerShort;
3523 }
3524 break;
3525 case NONSTATIC_WORD:
3526 if( nonstatic_word_space_count > 0 ) {
3527 real_offset = nonstatic_word_space_offset;
3528 nonstatic_word_space_offset += BytesPerInt;
3529 nonstatic_word_space_count -= 1;
3530 } else {
3531 real_offset = next_nonstatic_word_offset;
3532 next_nonstatic_word_offset += BytesPerInt;
3533 }
3534 break;
3535 case NONSTATIC_ALIGNED_DOUBLE:
3536 case NONSTATIC_DOUBLE:
3537 real_offset = next_nonstatic_double_offset;
3538 next_nonstatic_double_offset += BytesPerLong;
3539 break;
3540 default:
3541 ShouldNotReachHere();
3542 }
3543 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3544 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3545 }
3546
3547 // Size of instances
3548 int instance_size;
3549
3550 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3551 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3552
3553 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3554
3555 // Number of non-static oop map blocks allocated at end of klass.
3556 const unsigned int total_oop_map_count =
3557 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3558 first_nonstatic_oop_offset);
3559
3560 // Compute reference type
3561 ReferenceType rt;
3562 if (super_klass() == NULL) {
3563 rt = REF_NONE;
3564 } else {
3565 rt = super_klass->reference_type();
3566 }
3567
3568 // We can now create the basic klassOop for this klass
3569 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3570 static_field_size,
3571 total_oop_map_count,
3572 rt, CHECK_(nullHandle));
3573 instanceKlassHandle this_klass (THREAD, ik);
3574
3575 assert(this_klass->static_field_size() == static_field_size, "sanity");
3576 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3577 "sanity");
3578
3579 // Fill in information already parsed
3580 this_klass->set_access_flags(access_flags);
3581 this_klass->set_should_verify_class(verify);
3582 jint lh = Klass::instance_layout_helper(instance_size, false);
3583 this_klass->set_layout_helper(lh);
3584 assert(this_klass->oop_is_instance(), "layout is correct");
3585 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3586 // Not yet: supers are done below to support the new subtype-checking fields
3587 //this_klass->set_super(super_klass());
3588 this_klass->set_class_loader(class_loader());
3589 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3590 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3591 this_klass->set_static_oop_field_size(fac.static_oop_count);
3592 cp->set_pool_holder(this_klass());
3593 error_handler.set_in_error(false); // turn off error handler for cp
3594 this_klass->set_constants(cp());
3595 this_klass->set_local_interfaces(local_interfaces());
3596 this_klass->set_fields(fields());
3597 this_klass->set_methods(methods());
3598 if (has_final_method) {
3599 this_klass->set_has_final_method();
3600 }
3601 this_klass->set_method_ordering(method_ordering());
3602 // The instanceKlass::_methods_jmethod_ids cache and the
3603 // instanceKlass::_methods_cached_itable_indices cache are
3604 // both managed on the assumption that the initial cache
3605 // size is equal to the number of methods in the class. If
3606 // that changes, then instanceKlass::idnum_can_increment()
3607 // has to be changed accordingly.
3608 this_klass->set_initial_method_idnum(methods->length());
3609 this_klass->set_name(cp->klass_name_at(this_class_index));
3610 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3611 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3612 this_klass->set_protection_domain(protection_domain());
3613 this_klass->set_fields_annotations(fields_annotations());
3614 this_klass->set_methods_annotations(methods_annotations());
3615 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3616 this_klass->set_methods_default_annotations(methods_default_annotations());
3617
3618 this_klass->set_minor_version(minor_version);
3619 this_klass->set_major_version(major_version);
3620
3621 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3622 // (We used to do this lazily, but now we query it in Rewriter,
3623 // which is eagerly done for every method, so we might as well do it now,
3624 // when everything is fresh in memory.)
3625 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3626 for (int j = 0; j < methods->length(); j++) {
3627 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3628 }
3629 }
3630
3631 if (cached_class_file_bytes != NULL) {
3632 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3633 this_klass->set_cached_class_file(cached_class_file_bytes,
3634 cached_class_file_length);
3635 }
3636
3637 // Miranda methods
3638 if ((num_miranda_methods > 0) ||
3639 // if this class introduced new miranda methods or
3640 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3641 // super class exists and this class inherited miranda methods
3642 ) {
3643 this_klass->set_has_miranda_methods(); // then set a flag
3644 }
3645
3646 // Additional attributes
3647 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3648
3649 // Make sure this is the end of class file stream
3650 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3651
3652 // Initialize static fields
3653 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3654
3655 // VerifyOops believes that once this has been set, the object is completely loaded.
3656 // Compute transitive closure of interfaces this class implements
3657 this_klass->set_transitive_interfaces(transitive_interfaces());
3658
3659 // Fill in information needed to compute superclasses.
3660 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3661
3662 // Initialize itable offset tables
3663 klassItable::setup_itable_offset_table(this_klass);
3664
3665 // Do final class setup
3666 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3667
3668 set_precomputed_flags(this_klass);
3669
3670 // reinitialize modifiers, using the InnerClasses attribute
3671 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3672 this_klass->set_modifier_flags(computed_modifiers);
3673
3674 // check if this class can access its super class
3675 check_super_class_access(this_klass, CHECK_(nullHandle));
3676
3677 // check if this class can access its superinterfaces
3678 check_super_interface_access(this_klass, CHECK_(nullHandle));
3679
3680 // check if this class overrides any final method
3681 check_final_method_override(this_klass, CHECK_(nullHandle));
3682
3683 // check that if this class is an interface then it doesn't have static methods
3684 if (this_klass->is_interface()) {
3685 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3686 }
3687
3688 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3689 false /* not shared class */);
3690
3691 if (TraceClassLoading) {
3692 // print in a single call to reduce interleaving of output
3693 if (cfs->source() != NULL) {
3694 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3695 cfs->source());
3696 } else if (class_loader.is_null()) {
3697 if (THREAD->is_Java_thread()) {
3698 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3699 tty->print("[Loaded %s by instance of %s]\n",
3700 this_klass->external_name(),
3701 instanceKlass::cast(caller)->external_name());
3702 } else {
3703 tty->print("[Loaded %s]\n", this_klass->external_name());
3704 }
3705 } else {
3706 ResourceMark rm;
3707 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3708 instanceKlass::cast(class_loader->klass())->external_name());
3709 }
3710 }
3711
3712 if (TraceClassResolution) {
3713 // print out the superclass.
3714 const char * from = Klass::cast(this_klass())->external_name();
3715 if (this_klass->java_super() != NULL) {
3716 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3717 }
3718 // print out each of the interface classes referred to by this class.
3719 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3720 if (!local_interfaces.is_null()) {
3721 int length = local_interfaces->length();
3722 for (int i = 0; i < length; i++) {
3723 klassOop k = klassOop(local_interfaces->obj_at(i));
3724 instanceKlass* to_class = instanceKlass::cast(k);
3725 const char * to = to_class->external_name();
3726 tty->print("RESOLVE %s %s (interface)\n", from, to);
3727 }
3728 }
3729 }
3730
3731 #ifndef PRODUCT
3732 if( PrintCompactFieldsSavings ) {
3733 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3734 tty->print("[Saved %d of %d bytes in %s]\n",
3735 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3736 orig_nonstatic_field_size*heapOopSize,
3737 this_klass->external_name());
3738 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3739 tty->print("[Wasted %d over %d bytes in %s]\n",
3740 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3741 orig_nonstatic_field_size*heapOopSize,
3742 this_klass->external_name());
3743 }
3744 }
3745 #endif
3746
3747 // preserve result across HandleMark
3748 preserve_this_klass = this_klass();
3749 }
3750
3751 // Create new handle outside HandleMark
3752 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3753 debug_only(this_klass->as_klassOop()->verify();)
3754
3755 return this_klass;
3756 }
3757
3758
3759 unsigned int
3760 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3761 unsigned int nonstatic_oop_map_count,
3762 int first_nonstatic_oop_offset) {
3763 unsigned int map_count =
3764 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3765 if (nonstatic_oop_map_count > 0) {
3766 // We have oops to add to map
3767 if (map_count == 0) {
3768 map_count = nonstatic_oop_map_count;
3769 } else {
3770 // Check whether we should add a new map block or whether the last one can
3771 // be extended
3772 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3773 OopMapBlock* const last_map = first_map + map_count - 1;
3774
3775 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3776 if (next_offset == first_nonstatic_oop_offset) {
3777 // There is no gap bettwen superklass's last oop field and first
3778 // local oop field, merge maps.
3779 nonstatic_oop_map_count -= 1;
3780 } else {
3781 // Superklass didn't end with a oop field, add extra maps
3782 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3783 }
3784 map_count += nonstatic_oop_map_count;
3785 }
3786 }
3787 return map_count;
3788 }
3789
3790
3791 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3792 unsigned int nonstatic_oop_map_count,
3793 int* nonstatic_oop_offsets,
3794 unsigned int* nonstatic_oop_counts) {
3795 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3796 const instanceKlass* const super = k->superklass();
3797 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3798 if (super_count > 0) {
3799 // Copy maps from superklass
3800 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3801 for (unsigned int i = 0; i < super_count; ++i) {
3802 *this_oop_map++ = *super_oop_map++;
3803 }
3804 }
3805
3806 if (nonstatic_oop_map_count > 0) {
3807 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3808 // The counts differ because there is no gap between superklass's last oop
3809 // field and the first local oop field. Extend the last oop map copied
3810 // from the superklass instead of creating new one.
3811 nonstatic_oop_map_count--;
3812 nonstatic_oop_offsets++;
3813 this_oop_map--;
3814 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3815 this_oop_map++;
3816 }
3817
3818 // Add new map blocks, fill them
3819 while (nonstatic_oop_map_count-- > 0) {
3820 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3821 this_oop_map->set_count(*nonstatic_oop_counts++);
3822 this_oop_map++;
3823 }
3824 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3825 this_oop_map, "sanity");
3826 }
3827 }
3828
3829
3830 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3831 klassOop super = k->super();
3832
3833 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3834 // in which case we don't have to register objects as finalizable
3835 if (!_has_empty_finalizer) {
3836 if (_has_finalizer ||
3837 (super != NULL && super->klass_part()->has_finalizer())) {
3838 k->set_has_finalizer();
3839 }
3840 }
3841
3842 #ifdef ASSERT
3843 bool f = false;
3844 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3845 vmSymbols::void_method_signature());
3846 if (m != NULL && !m->is_empty_method()) {
3847 f = true;
3848 }
3849 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3850 #endif
3851
3852 // Check if this klass supports the java.lang.Cloneable interface
3853 if (SystemDictionary::Cloneable_klass_loaded()) {
3854 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3855 k->set_is_cloneable();
3856 }
3857 }
3858
3859 // Check if this klass has a vanilla default constructor
3860 if (super == NULL) {
3861 // java.lang.Object has empty default constructor
3862 k->set_has_vanilla_constructor();
3863 } else {
3864 if (Klass::cast(super)->has_vanilla_constructor() &&
3865 _has_vanilla_constructor) {
3866 k->set_has_vanilla_constructor();
3867 }
3868 #ifdef ASSERT
3869 bool v = false;
3870 if (Klass::cast(super)->has_vanilla_constructor()) {
3871 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3872 ), vmSymbols::void_method_signature());
3873 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3874 v = true;
3875 }
3876 }
3877 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3878 #endif
3879 }
3880
3881 // If it cannot be fast-path allocated, set a bit in the layout helper.
3882 // See documentation of instanceKlass::can_be_fastpath_allocated().
3883 assert(k->size_helper() > 0, "layout_helper is initialized");
3884 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3885 || k->is_abstract() || k->is_interface()
3886 || (k->name() == vmSymbols::java_lang_Class()
3887 && k->class_loader() == NULL)
3888 || k->size_helper() >= FastAllocateSizeLimit) {
3889 // Forbid fast-path allocation.
3890 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3891 k->set_layout_helper(lh);
3892 }
3893 }
3894
3895
3896 // utility method for appending and array with check for duplicates
3897
3898 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3899 // iterate over new interfaces
3900 for (int i = 0; i < ifs->length(); i++) {
3901 oop e = ifs->obj_at(i);
3902 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3903 // check for duplicates
3904 bool duplicate = false;
3905 for (int j = 0; j < index; j++) {
3906 if (result->obj_at(j) == e) {
3907 duplicate = true;
3908 break;
3909 }
3910 }
3911 // add new interface
3912 if (!duplicate) {
3913 result->obj_at_put(index++, e);
3914 }
3915 }
3916 }
3917
3918 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3919 // Compute maximum size for transitive interfaces
3920 int max_transitive_size = 0;
3921 int super_size = 0;
3922 // Add superclass transitive interfaces size
3923 if (super.not_null()) {
3924 super_size = super->transitive_interfaces()->length();
3925 max_transitive_size += super_size;
3926 }
3927 // Add local interfaces' super interfaces
3928 int local_size = local_ifs->length();
3929 for (int i = 0; i < local_size; i++) {
3930 klassOop l = klassOop(local_ifs->obj_at(i));
3931 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3932 }
3933 // Finally add local interfaces
3934 max_transitive_size += local_size;
3935 // Construct array
3936 objArrayHandle result;
3937 if (max_transitive_size == 0) {
3938 // no interfaces, use canonicalized array
3939 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3940 } else if (max_transitive_size == super_size) {
3941 // no new local interfaces added, share superklass' transitive interface array
3942 result = objArrayHandle(THREAD, super->transitive_interfaces());
3943 } else if (max_transitive_size == local_size) {
3944 // only local interfaces added, share local interface array
3945 result = local_ifs;
3946 } else {
3947 objArrayHandle nullHandle;
3948 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3949 result = objArrayHandle(THREAD, new_objarray);
3950 int index = 0;
3951 // Copy down from superclass
3952 if (super.not_null()) {
3953 append_interfaces(result, index, super->transitive_interfaces());
3954 }
3955 // Copy down from local interfaces' superinterfaces
3956 for (int i = 0; i < local_ifs->length(); i++) {
3957 klassOop l = klassOop(local_ifs->obj_at(i));
3958 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3959 }
3960 // Finally add local interfaces
3961 append_interfaces(result, index, local_ifs());
3962
3963 // Check if duplicates were removed
3964 if (index != max_transitive_size) {
3965 assert(index < max_transitive_size, "just checking");
3966 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3967 for (int i = 0; i < index; i++) {
3968 oop e = result->obj_at(i);
3969 assert(e != NULL, "just checking");
3970 new_result->obj_at_put(i, e);
3971 }
3972 result = objArrayHandle(THREAD, new_result);
3973 }
3974 }
3975 return result;
3976 }
3977
3978
3979 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3980 klassOop super = this_klass->super();
3981 if ((super != NULL) &&
3982 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3983 ResourceMark rm(THREAD);
3984 Exceptions::fthrow(
3985 THREAD_AND_LOCATION,
3986 vmSymbols::java_lang_IllegalAccessError(),
3987 "class %s cannot access its superclass %s",
3988 this_klass->external_name(),
3989 instanceKlass::cast(super)->external_name()
3990 );
3991 return;
3992 }
3993 }
3994
3995
3996 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3997 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3998 int lng = local_interfaces->length();
3999 for (int i = lng - 1; i >= 0; i--) {
4000 klassOop k = klassOop(local_interfaces->obj_at(i));
4001 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
4002 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
4003 ResourceMark rm(THREAD);
4004 Exceptions::fthrow(
4005 THREAD_AND_LOCATION,
4006 vmSymbols::java_lang_IllegalAccessError(),
4007 "class %s cannot access its superinterface %s",
4008 this_klass->external_name(),
4009 instanceKlass::cast(k)->external_name()
4010 );
4011 return;
4012 }
4013 }
4014 }
4015
4016
4017 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4018 objArrayHandle methods (THREAD, this_klass->methods());
4019 int num_methods = methods->length();
4020
4021 // go thru each method and check if it overrides a final method
4022 for (int index = 0; index < num_methods; index++) {
4023 methodOop m = (methodOop)methods->obj_at(index);
4024
4025 // skip private, static and <init> methods
4026 if ((!m->is_private()) &&
4027 (!m->is_static()) &&
4028 (m->name() != vmSymbols::object_initializer_name())) {
4029
4030 Symbol* name = m->name();
4031 Symbol* signature = m->signature();
4032 klassOop k = this_klass->super();
4033 methodOop super_m = NULL;
4034 while (k != NULL) {
4035 // skip supers that don't have final methods.
4036 if (k->klass_part()->has_final_method()) {
4037 // lookup a matching method in the super class hierarchy
4038 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
4039 if (super_m == NULL) {
4040 break; // didn't find any match; get out
4041 }
4042
4043 if (super_m->is_final() &&
4044 // matching method in super is final
4045 (Reflection::verify_field_access(this_klass->as_klassOop(),
4046 super_m->method_holder(),
4047 super_m->method_holder(),
4048 super_m->access_flags(), false))
4049 // this class can access super final method and therefore override
4050 ) {
4051 ResourceMark rm(THREAD);
4052 Exceptions::fthrow(
4053 THREAD_AND_LOCATION,
4054 vmSymbols::java_lang_VerifyError(),
4055 "class %s overrides final method %s.%s",
4056 this_klass->external_name(),
4057 name->as_C_string(),
4058 signature->as_C_string()
4059 );
4060 return;
4061 }
4062
4063 // continue to look from super_m's holder's super.
4064 k = instanceKlass::cast(super_m->method_holder())->super();
4065 continue;
4066 }
4067
4068 k = k->klass_part()->super();
4069 }
4070 }
4071 }
4072 }
4073
4074
4075 // assumes that this_klass is an interface
4076 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4077 assert(this_klass->is_interface(), "not an interface");
4078 objArrayHandle methods (THREAD, this_klass->methods());
4079 int num_methods = methods->length();
4080
4081 for (int index = 0; index < num_methods; index++) {
4082 methodOop m = (methodOop)methods->obj_at(index);
4083 // if m is static and not the init method, throw a verify error
4084 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4085 ResourceMark rm(THREAD);
4086 Exceptions::fthrow(
4087 THREAD_AND_LOCATION,
4088 vmSymbols::java_lang_VerifyError(),
4089 "Illegal static method %s in interface %s",
4090 m->name()->as_C_string(),
4091 this_klass->external_name()
4092 );
4093 return;
4094 }
4095 }
4096 }
4097
4098 // utility methods for format checking
4099
4100 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4101 if (!_need_verify) { return; }
4102
4103 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4104 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4105 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4106 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4107 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4108 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4109 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4110
4111 if ((is_abstract && is_final) ||
4112 (is_interface && !is_abstract) ||
4113 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4114 (!is_interface && major_gte_15 && is_annotation)) {
4115 ResourceMark rm(THREAD);
4116 Exceptions::fthrow(
4117 THREAD_AND_LOCATION,
4118 vmSymbols::java_lang_ClassFormatError(),
4119 "Illegal class modifiers in class %s: 0x%X",
4120 _class_name->as_C_string(), flags
4121 );
4122 return;
4123 }
4124 }
4125
4126 bool ClassFileParser::has_illegal_visibility(jint flags) {
4127 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4128 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4129 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4130
4131 return ((is_public && is_protected) ||
4132 (is_public && is_private) ||
4133 (is_protected && is_private));
4134 }
4135
4136 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4137 u2 max_version =
4138 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4139 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4140 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4141 (major <= max_version) &&
4142 ((major != max_version) ||
4143 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4144 }
4145
4146 void ClassFileParser::verify_legal_field_modifiers(
4147 jint flags, bool is_interface, TRAPS) {
4148 if (!_need_verify) { return; }
4149
4150 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4151 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4152 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4153 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4154 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4155 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4156 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4157 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4158 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4159
4160 bool is_illegal = false;
4161
4162 if (is_interface) {
4163 if (!is_public || !is_static || !is_final || is_private ||
4164 is_protected || is_volatile || is_transient ||
4165 (major_gte_15 && is_enum)) {
4166 is_illegal = true;
4167 }
4168 } else { // not interface
4169 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4170 is_illegal = true;
4171 }
4172 }
4173
4174 if (is_illegal) {
4175 ResourceMark rm(THREAD);
4176 Exceptions::fthrow(
4177 THREAD_AND_LOCATION,
4178 vmSymbols::java_lang_ClassFormatError(),
4179 "Illegal field modifiers in class %s: 0x%X",
4180 _class_name->as_C_string(), flags);
4181 return;
4182 }
4183 }
4184
4185 void ClassFileParser::verify_legal_method_modifiers(
4186 jint flags, bool is_interface, Symbol* name, TRAPS) {
4187 if (!_need_verify) { return; }
4188
4189 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4190 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4191 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4192 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4193 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4194 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4195 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4196 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4197 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4198 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4199 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4200
4201 bool is_illegal = false;
4202
4203 if (is_interface) {
4204 if (!is_abstract || !is_public || is_static || is_final ||
4205 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4206 is_illegal = true;
4207 }
4208 } else { // not interface
4209 if (is_initializer) {
4210 if (is_static || is_final || is_synchronized || is_native ||
4211 is_abstract || (major_gte_15 && is_bridge)) {
4212 is_illegal = true;
4213 }
4214 } else { // not initializer
4215 if (is_abstract) {
4216 if ((is_final || is_native || is_private || is_static ||
4217 (major_gte_15 && (is_synchronized || is_strict)))) {
4218 is_illegal = true;
4219 }
4220 }
4221 if (has_illegal_visibility(flags)) {
4222 is_illegal = true;
4223 }
4224 }
4225 }
4226
4227 if (is_illegal) {
4228 ResourceMark rm(THREAD);
4229 Exceptions::fthrow(
4230 THREAD_AND_LOCATION,
4231 vmSymbols::java_lang_ClassFormatError(),
4232 "Method %s in class %s has illegal modifiers: 0x%X",
4233 name->as_C_string(), _class_name->as_C_string(), flags);
4234 return;
4235 }
4236 }
4237
4238 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4239 assert(_need_verify, "only called when _need_verify is true");
4240 int i = 0;
4241 int count = length >> 2;
4242 for (int k=0; k<count; k++) {
4243 unsigned char b0 = buffer[i];
4244 unsigned char b1 = buffer[i+1];
4245 unsigned char b2 = buffer[i+2];
4246 unsigned char b3 = buffer[i+3];
4247 // For an unsigned char v,
4248 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4249 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4250 unsigned char res = b0 | b0 - 1 |
4251 b1 | b1 - 1 |
4252 b2 | b2 - 1 |
4253 b3 | b3 - 1;
4254 if (res >= 128) break;
4255 i += 4;
4256 }
4257 for(; i < length; i++) {
4258 unsigned short c;
4259 // no embedded zeros
4260 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4261 if(buffer[i] < 128) {
4262 continue;
4263 }
4264 if ((i + 5) < length) { // see if it's legal supplementary character
4265 if (UTF8::is_supplementary_character(&buffer[i])) {
4266 c = UTF8::get_supplementary_character(&buffer[i]);
4267 i += 5;
4268 continue;
4269 }
4270 }
4271 switch (buffer[i] >> 4) {
4272 default: break;
4273 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4274 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4275 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4276 c = (buffer[i] & 0x1F) << 6;
4277 i++;
4278 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4279 c += buffer[i] & 0x3F;
4280 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4281 // for classes with major > 47, c must a null or a character in its shortest form
4282 break;
4283 }
4284 }
4285 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4286 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4287 c = (buffer[i] & 0xF) << 12;
4288 i += 2;
4289 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4290 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4291 if (_major_version <= 47 || c >= 0x800) {
4292 // for classes with major > 47, c must be in its shortest form
4293 break;
4294 }
4295 }
4296 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4297 } // end of switch
4298 } // end of for
4299 }
4300
4301 // Checks if name is a legal class name.
4302 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4303 if (!_need_verify || _relax_verify) { return; }
4304
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;
4309
4310 if (length > 0) {
4311 char* p;
4312 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4313 p = skip_over_field_signature(bytes, false, length, CHECK);
4314 legal = (p != NULL) && ((p - bytes) == (int)length);
4315 } else if (_major_version < JAVA_1_5_VERSION) {
4316 if (bytes[0] != '<') {
4317 p = skip_over_field_name(bytes, true, length);
4318 legal = (p != NULL) && ((p - bytes) == (int)length);
4319 }
4320 } else {
4321 // 4900761: relax the constraints based on JSR202 spec
4322 // Class names may be drawn from the entire Unicode character set.
4323 // Identifiers between '/' must be unqualified names.
4324 // The utf8 string has been verified when parsing cpool entries.
4325 legal = verify_unqualified_name(bytes, length, LegalClass);
4326 }
4327 }
4328 if (!legal) {
4329 ResourceMark rm(THREAD);
4330 Exceptions::fthrow(
4331 THREAD_AND_LOCATION,
4332 vmSymbols::java_lang_ClassFormatError(),
4333 "Illegal class name \"%s\" in class file %s", bytes,
4334 _class_name->as_C_string()
4335 );
4336 return;
4337 }
4338 }
4339
4340 // Checks if name is a legal field name.
4341 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4342 if (!_need_verify || _relax_verify) { return; }
4343
4344 char buf[fixed_buffer_size];
4345 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4346 unsigned int length = name->utf8_length();
4347 bool legal = false;
4348
4349 if (length > 0) {
4350 if (_major_version < JAVA_1_5_VERSION) {
4351 if (bytes[0] != '<') {
4352 char* p = skip_over_field_name(bytes, false, length);
4353 legal = (p != NULL) && ((p - bytes) == (int)length);
4354 }
4355 } else {
4356 // 4881221: relax the constraints based on JSR202 spec
4357 legal = verify_unqualified_name(bytes, length, LegalField);
4358 }
4359 }
4360
4361 if (!legal) {
4362 ResourceMark rm(THREAD);
4363 Exceptions::fthrow(
4364 THREAD_AND_LOCATION,
4365 vmSymbols::java_lang_ClassFormatError(),
4366 "Illegal field name \"%s\" in class %s", bytes,
4367 _class_name->as_C_string()
4368 );
4369 return;
4370 }
4371 }
4372
4373 // Checks if name is a legal method name.
4374 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4375 if (!_need_verify || _relax_verify) { return; }
4376
4377 assert(name != NULL, "method name is null");
4378 char buf[fixed_buffer_size];
4379 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4380 unsigned int length = name->utf8_length();
4381 bool legal = false;
4382
4383 if (length > 0) {
4384 if (bytes[0] == '<') {
4385 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4386 legal = true;
4387 }
4388 } else if (_major_version < JAVA_1_5_VERSION) {
4389 char* p;
4390 p = skip_over_field_name(bytes, false, length);
4391 legal = (p != NULL) && ((p - bytes) == (int)length);
4392 } else {
4393 // 4881221: relax the constraints based on JSR202 spec
4394 legal = verify_unqualified_name(bytes, length, LegalMethod);
4395 }
4396 }
4397
4398 if (!legal) {
4399 ResourceMark rm(THREAD);
4400 Exceptions::fthrow(
4401 THREAD_AND_LOCATION,
4402 vmSymbols::java_lang_ClassFormatError(),
4403 "Illegal method name \"%s\" in class %s", bytes,
4404 _class_name->as_C_string()
4405 );
4406 return;
4407 }
4408 }
4409
4410
4411 // Checks if signature is a legal field signature.
4412 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4413 if (!_need_verify) { return; }
4414
4415 char buf[fixed_buffer_size];
4416 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4417 unsigned int length = signature->utf8_length();
4418 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4419
4420 if (p == NULL || (p - bytes) != (int)length) {
4421 throwIllegalSignature("Field", name, signature, CHECK);
4422 }
4423 }
4424
4425 // Checks if signature is a legal method signature.
4426 // Returns number of parameters
4427 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4428 if (!_need_verify) {
4429 // make sure caller's args_size will be less than 0 even for non-static
4430 // method so it will be recomputed in compute_size_of_parameters().
4431 return -2;
4432 }
4433
4434 unsigned int args_size = 0;
4435 char buf[fixed_buffer_size];
4436 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4437 unsigned int length = signature->utf8_length();
4438 char* nextp;
4439
4440 // The first character must be a '('
4441 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4442 length--;
4443 // Skip over legal field signatures
4444 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4445 while ((length > 0) && (nextp != NULL)) {
4446 args_size++;
4447 if (p[0] == 'J' || p[0] == 'D') {
4448 args_size++;
4449 }
4450 length -= nextp - p;
4451 p = nextp;
4452 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4453 }
4454 // The first non-signature thing better be a ')'
4455 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4456 length--;
4457 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4458 // All internal methods must return void
4459 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4460 return args_size;
4461 }
4462 } else {
4463 // Now we better just have a return value
4464 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4465 if (nextp && ((int)length == (nextp - p))) {
4466 return args_size;
4467 }
4468 }
4469 }
4470 }
4471 // Report error
4472 throwIllegalSignature("Method", name, signature, CHECK_0);
4473 return 0;
4474 }
4475
4476
4477 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4478 // Method names also may not contain the characters '<' or '>', unless <init>
4479 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4480 // method. Because these names have been checked as special cases before
4481 // calling this method in verify_legal_method_name.
4482 bool ClassFileParser::verify_unqualified_name(
4483 char* name, unsigned int length, int type) {
4484 jchar ch;
4485
4486 for (char* p = name; p != name + length; ) {
4487 ch = *p;
4488 if (ch < 128) {
4489 p++;
4490 if (ch == '.' || ch == ';' || ch == '[' ) {
4491 return false; // do not permit '.', ';', or '['
4492 }
4493 if (type != LegalClass && ch == '/') {
4494 return false; // do not permit '/' unless it's class name
4495 }
4496 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4497 return false; // do not permit '<' or '>' in method names
4498 }
4499 } else {
4500 char* tmp_p = UTF8::next(p, &ch);
4501 p = tmp_p;
4502 }
4503 }
4504 return true;
4505 }
4506
4507
4508 // Take pointer to a string. Skip over the longest part of the string that could
4509 // be taken as a fieldname. Allow '/' if slash_ok is true.
4510 // Return a pointer to just past the fieldname.
4511 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4512 // being true, we saw consecutive slashes (meaning we were looking for a
4513 // qualified path but found something that was badly-formed).
4514 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4515 char* p;
4516 jchar ch;
4517 jboolean last_is_slash = false;
4518 jboolean not_first_ch = false;
4519
4520 for (p = name; p != name + length; not_first_ch = true) {
4521 char* old_p = p;
4522 ch = *p;
4523 if (ch < 128) {
4524 p++;
4525 // quick check for ascii
4526 if ((ch >= 'a' && ch <= 'z') ||
4527 (ch >= 'A' && ch <= 'Z') ||
4528 (ch == '_' || ch == '$') ||
4529 (not_first_ch && ch >= '0' && ch <= '9')) {
4530 last_is_slash = false;
4531 continue;
4532 }
4533 if (slash_ok && ch == '/') {
4534 if (last_is_slash) {
4535 return NULL; // Don't permit consecutive slashes
4536 }
4537 last_is_slash = true;
4538 continue;
4539 }
4540 } else {
4541 jint unicode_ch;
4542 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4543 p = tmp_p;
4544 last_is_slash = false;
4545 // Check if ch is Java identifier start or is Java identifier part
4546 // 4672820: call java.lang.Character methods directly without generating separate tables.
4547 EXCEPTION_MARK;
4548 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4549
4550 // return value
4551 JavaValue result(T_BOOLEAN);
4552 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4553 JavaCallArguments args;
4554 args.push_int(unicode_ch);
4555
4556 // public static boolean isJavaIdentifierStart(char ch);
4557 JavaCalls::call_static(&result,
4558 klass,
4559 vmSymbols::isJavaIdentifierStart_name(),
4560 vmSymbols::int_bool_signature(),
4561 &args,
4562 THREAD);
4563
4564 if (HAS_PENDING_EXCEPTION) {
4565 CLEAR_PENDING_EXCEPTION;
4566 return 0;
4567 }
4568 if (result.get_jboolean()) {
4569 continue;
4570 }
4571
4572 if (not_first_ch) {
4573 // public static boolean isJavaIdentifierPart(char ch);
4574 JavaCalls::call_static(&result,
4575 klass,
4576 vmSymbols::isJavaIdentifierPart_name(),
4577 vmSymbols::int_bool_signature(),
4578 &args,
4579 THREAD);
4580
4581 if (HAS_PENDING_EXCEPTION) {
4582 CLEAR_PENDING_EXCEPTION;
4583 return 0;
4584 }
4585
4586 if (result.get_jboolean()) {
4587 continue;
4588 }
4589 }
4590 }
4591 return (not_first_ch) ? old_p : NULL;
4592 }
4593 return (not_first_ch) ? p : NULL;
4594 }
4595
4596
4597 // Take pointer to a string. Skip over the longest part of the string that could
4598 // be taken as a field signature. Allow "void" if void_ok.
4599 // Return a pointer to just past the signature.
4600 // Return NULL if no legal signature is found.
4601 char* ClassFileParser::skip_over_field_signature(char* signature,
4602 bool void_ok,
4603 unsigned int length,
4604 TRAPS) {
4605 unsigned int array_dim = 0;
4606 while (length > 0) {
4607 switch (signature[0]) {
4608 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4609 case JVM_SIGNATURE_BOOLEAN:
4610 case JVM_SIGNATURE_BYTE:
4611 case JVM_SIGNATURE_CHAR:
4612 case JVM_SIGNATURE_SHORT:
4613 case JVM_SIGNATURE_INT:
4614 case JVM_SIGNATURE_FLOAT:
4615 case JVM_SIGNATURE_LONG:
4616 case JVM_SIGNATURE_DOUBLE:
4617 return signature + 1;
4618 case JVM_SIGNATURE_CLASS: {
4619 if (_major_version < JAVA_1_5_VERSION) {
4620 // Skip over the class name if one is there
4621 char* p = skip_over_field_name(signature + 1, true, --length);
4622
4623 // The next character better be a semicolon
4624 if (p && (p - signature) > 1 && p[0] == ';') {
4625 return p + 1;
4626 }
4627 } else {
4628 // 4900761: For class version > 48, any unicode is allowed in class name.
4629 length--;
4630 signature++;
4631 while (length > 0 && signature[0] != ';') {
4632 if (signature[0] == '.') {
4633 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4634 }
4635 length--;
4636 signature++;
4637 }
4638 if (signature[0] == ';') { return signature + 1; }
4639 }
4640
4641 return NULL;
4642 }
4643 case JVM_SIGNATURE_ARRAY:
4644 array_dim++;
4645 if (array_dim > 255) {
4646 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4647 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4648 }
4649 // The rest of what's there better be a legal signature
4650 signature++;
4651 length--;
4652 void_ok = false;
4653 break;
4654
4655 default:
4656 return NULL;
4657 }
4658 }
4659 return NULL;
4660 }