Tue, 20 Jul 2010 08:41:42 -0700
6964170: Verifier crashes
Summary: Check if klassOop != NULL rather than klass_part != NULL
Reviewed-by: kamg, never
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_classFileParser.cpp.incl"
28 // We generally try to create the oops directly when parsing, rather than
29 // allocating temporary data structures and copying the bytes twice. A
30 // temporary area is only needed when parsing utf8 entries in the constant
31 // pool and when parsing line number tables.
33 // We add assert in debug mode when class format is not checked.
35 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
36 #define JAVA_MIN_SUPPORTED_VERSION 45
37 #define JAVA_MAX_SUPPORTED_VERSION 51
38 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
40 // Used for two backward compatibility reasons:
41 // - to check for new additions to the class file format in JDK1.5
42 // - to check for bug fixes in the format checker in JDK1.5
43 #define JAVA_1_5_VERSION 49
45 // Used for backward compatibility reasons:
46 // - to check for javac bug fixes that happened after 1.5
47 // - also used as the max version when running in jdk6
48 #define JAVA_6_VERSION 50
50 // Used for backward compatibility reasons:
51 // - to check NameAndType_info signatures more aggressively
52 #define JAVA_7_VERSION 51
55 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
56 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
57 // this function (_current can be allocated in a register, with scalar
58 // replacement of aggregates). The _current pointer is copied back to
59 // stream() when this function returns. DON'T call another method within
60 // this method that uses stream().
61 ClassFileStream* cfs0 = stream();
62 ClassFileStream cfs1 = *cfs0;
63 ClassFileStream* cfs = &cfs1;
64 #ifdef ASSERT
65 u1* old_current = cfs0->current();
66 #endif
68 // Used for batching symbol allocations.
69 const char* names[SymbolTable::symbol_alloc_batch_size];
70 int lengths[SymbolTable::symbol_alloc_batch_size];
71 int indices[SymbolTable::symbol_alloc_batch_size];
72 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
73 int names_count = 0;
75 // parsing Index 0 is unused
76 for (int index = 1; index < length; index++) {
77 // Each of the following case guarantees one more byte in the stream
78 // for the following tag or the access_flags following constant pool,
79 // so we don't need bounds-check for reading tag.
80 u1 tag = cfs->get_u1_fast();
81 switch (tag) {
82 case JVM_CONSTANT_Class :
83 {
84 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
85 u2 name_index = cfs->get_u2_fast();
86 cp->klass_index_at_put(index, name_index);
87 }
88 break;
89 case JVM_CONSTANT_Fieldref :
90 {
91 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
92 u2 class_index = cfs->get_u2_fast();
93 u2 name_and_type_index = cfs->get_u2_fast();
94 cp->field_at_put(index, class_index, name_and_type_index);
95 }
96 break;
97 case JVM_CONSTANT_Methodref :
98 {
99 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
100 u2 class_index = cfs->get_u2_fast();
101 u2 name_and_type_index = cfs->get_u2_fast();
102 cp->method_at_put(index, class_index, name_and_type_index);
103 }
104 break;
105 case JVM_CONSTANT_InterfaceMethodref :
106 {
107 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
108 u2 class_index = cfs->get_u2_fast();
109 u2 name_and_type_index = cfs->get_u2_fast();
110 cp->interface_method_at_put(index, class_index, name_and_type_index);
111 }
112 break;
113 case JVM_CONSTANT_String :
114 {
115 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
116 u2 string_index = cfs->get_u2_fast();
117 cp->string_index_at_put(index, string_index);
118 }
119 break;
120 case JVM_CONSTANT_MethodHandle :
121 case JVM_CONSTANT_MethodType :
122 if (!EnableMethodHandles ||
123 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
124 classfile_parse_error(
125 (!EnableInvokeDynamic ?
126 "This JVM does not support constant tag %u in class file %s" :
127 "Class file version does not support constant tag %u in class file %s"),
128 tag, CHECK);
129 }
130 if (tag == JVM_CONSTANT_MethodHandle) {
131 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
132 u1 ref_kind = cfs->get_u1_fast();
133 u2 method_index = cfs->get_u2_fast();
134 cp->method_handle_index_at_put(index, ref_kind, method_index);
135 } else if (tag == JVM_CONSTANT_MethodType) {
136 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
137 u2 signature_index = cfs->get_u2_fast();
138 cp->method_type_index_at_put(index, signature_index);
139 } else {
140 ShouldNotReachHere();
141 }
142 break;
143 case JVM_CONSTANT_Integer :
144 {
145 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
146 u4 bytes = cfs->get_u4_fast();
147 cp->int_at_put(index, (jint) bytes);
148 }
149 break;
150 case JVM_CONSTANT_Float :
151 {
152 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
153 u4 bytes = cfs->get_u4_fast();
154 cp->float_at_put(index, *(jfloat*)&bytes);
155 }
156 break;
157 case JVM_CONSTANT_Long :
158 // A mangled type might cause you to overrun allocated memory
159 guarantee_property(index+1 < length,
160 "Invalid constant pool entry %u in class file %s",
161 index, CHECK);
162 {
163 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
164 u8 bytes = cfs->get_u8_fast();
165 cp->long_at_put(index, bytes);
166 }
167 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
168 break;
169 case JVM_CONSTANT_Double :
170 // A mangled type might cause you to overrun allocated memory
171 guarantee_property(index+1 < length,
172 "Invalid constant pool entry %u in class file %s",
173 index, CHECK);
174 {
175 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
176 u8 bytes = cfs->get_u8_fast();
177 cp->double_at_put(index, *(jdouble*)&bytes);
178 }
179 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
180 break;
181 case JVM_CONSTANT_NameAndType :
182 {
183 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
184 u2 name_index = cfs->get_u2_fast();
185 u2 signature_index = cfs->get_u2_fast();
186 cp->name_and_type_at_put(index, name_index, signature_index);
187 }
188 break;
189 case JVM_CONSTANT_Utf8 :
190 {
191 cfs->guarantee_more(2, CHECK); // utf8_length
192 u2 utf8_length = cfs->get_u2_fast();
193 u1* utf8_buffer = cfs->get_u1_buffer();
194 assert(utf8_buffer != NULL, "null utf8 buffer");
195 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
196 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
197 cfs->skip_u1_fast(utf8_length);
199 // Before storing the symbol, make sure it's legal
200 if (_need_verify) {
201 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
202 }
204 if (AnonymousClasses && has_cp_patch_at(index)) {
205 Handle patch = clear_cp_patch_at(index);
206 guarantee_property(java_lang_String::is_instance(patch()),
207 "Illegal utf8 patch at %d in class file %s",
208 index, CHECK);
209 char* str = java_lang_String::as_utf8_string(patch());
210 // (could use java_lang_String::as_symbol instead, but might as well batch them)
211 utf8_buffer = (u1*) str;
212 utf8_length = (int) strlen(str);
213 }
215 unsigned int hash;
216 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
217 if (result == NULL) {
218 names[names_count] = (char*)utf8_buffer;
219 lengths[names_count] = utf8_length;
220 indices[names_count] = index;
221 hashValues[names_count++] = hash;
222 if (names_count == SymbolTable::symbol_alloc_batch_size) {
223 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
224 names_count = 0;
225 }
226 } else {
227 cp->symbol_at_put(index, result);
228 }
229 }
230 break;
231 default:
232 classfile_parse_error(
233 "Unknown constant tag %u in class file %s", tag, CHECK);
234 break;
235 }
236 }
238 // Allocate the remaining symbols
239 if (names_count > 0) {
240 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
241 }
243 // Copy _current pointer of local copy back to stream().
244 #ifdef ASSERT
245 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
246 #endif
247 cfs0->set_current(cfs1.current());
248 }
250 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
252 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
253 ClassFileStream* cfs = stream();
254 constantPoolHandle nullHandle;
256 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
257 u2 length = cfs->get_u2_fast();
258 guarantee_property(
259 length >= 1, "Illegal constant pool size %u in class file %s",
260 length, CHECK_(nullHandle));
261 constantPoolOop constant_pool =
262 oopFactory::new_constantPool(length,
263 methodOopDesc::IsSafeConc,
264 CHECK_(nullHandle));
265 constantPoolHandle cp (THREAD, constant_pool);
267 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
269 // parsing constant pool entries
270 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
272 int index = 1; // declared outside of loops for portability
274 // first verification pass - validate cross references and fixup class and string constants
275 for (index = 1; index < length; index++) { // Index 0 is unused
276 switch (cp->tag_at(index).value()) {
277 case JVM_CONSTANT_Class :
278 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
279 break;
280 case JVM_CONSTANT_Fieldref :
281 // fall through
282 case JVM_CONSTANT_Methodref :
283 // fall through
284 case JVM_CONSTANT_InterfaceMethodref : {
285 if (!_need_verify) break;
286 int klass_ref_index = cp->klass_ref_index_at(index);
287 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
288 check_property(valid_cp_range(klass_ref_index, length) &&
289 is_klass_reference(cp, klass_ref_index),
290 "Invalid constant pool index %u in class file %s",
291 klass_ref_index,
292 CHECK_(nullHandle));
293 check_property(valid_cp_range(name_and_type_ref_index, length) &&
294 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
295 "Invalid constant pool index %u in class file %s",
296 name_and_type_ref_index,
297 CHECK_(nullHandle));
298 break;
299 }
300 case JVM_CONSTANT_String :
301 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
302 break;
303 case JVM_CONSTANT_Integer :
304 break;
305 case JVM_CONSTANT_Float :
306 break;
307 case JVM_CONSTANT_Long :
308 case JVM_CONSTANT_Double :
309 index++;
310 check_property(
311 (index < length && cp->tag_at(index).is_invalid()),
312 "Improper constant pool long/double index %u in class file %s",
313 index, CHECK_(nullHandle));
314 break;
315 case JVM_CONSTANT_NameAndType : {
316 if (!_need_verify) break;
317 int name_ref_index = cp->name_ref_index_at(index);
318 int signature_ref_index = cp->signature_ref_index_at(index);
319 check_property(
320 valid_cp_range(name_ref_index, length) &&
321 cp->tag_at(name_ref_index).is_utf8(),
322 "Invalid constant pool index %u in class file %s",
323 name_ref_index, CHECK_(nullHandle));
324 check_property(
325 valid_cp_range(signature_ref_index, length) &&
326 cp->tag_at(signature_ref_index).is_utf8(),
327 "Invalid constant pool index %u in class file %s",
328 signature_ref_index, CHECK_(nullHandle));
329 break;
330 }
331 case JVM_CONSTANT_Utf8 :
332 break;
333 case JVM_CONSTANT_UnresolvedClass : // fall-through
334 case JVM_CONSTANT_UnresolvedClassInError:
335 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
336 break;
337 case JVM_CONSTANT_ClassIndex :
338 {
339 int class_index = cp->klass_index_at(index);
340 check_property(
341 valid_cp_range(class_index, length) &&
342 cp->tag_at(class_index).is_utf8(),
343 "Invalid constant pool index %u in class file %s",
344 class_index, CHECK_(nullHandle));
345 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
346 }
347 break;
348 case JVM_CONSTANT_UnresolvedString :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
350 break;
351 case JVM_CONSTANT_StringIndex :
352 {
353 int string_index = cp->string_index_at(index);
354 check_property(
355 valid_cp_range(string_index, length) &&
356 cp->tag_at(string_index).is_utf8(),
357 "Invalid constant pool index %u in class file %s",
358 string_index, CHECK_(nullHandle));
359 symbolOop sym = cp->symbol_at(string_index);
360 cp->unresolved_string_at_put(index, sym);
361 }
362 break;
363 case JVM_CONSTANT_MethodHandle :
364 {
365 int ref_index = cp->method_handle_index_at(index);
366 check_property(
367 valid_cp_range(ref_index, length) &&
368 EnableMethodHandles,
369 "Invalid constant pool index %u in class file %s",
370 ref_index, CHECK_(nullHandle));
371 constantTag tag = cp->tag_at(ref_index);
372 int ref_kind = cp->method_handle_ref_kind_at(index);
373 switch (ref_kind) {
374 case JVM_REF_getField:
375 case JVM_REF_getStatic:
376 case JVM_REF_putField:
377 case JVM_REF_putStatic:
378 check_property(
379 tag.is_field(),
380 "Invalid constant pool index %u in class file %s (not a field)",
381 ref_index, CHECK_(nullHandle));
382 break;
383 case JVM_REF_invokeVirtual:
384 case JVM_REF_invokeStatic:
385 case JVM_REF_invokeSpecial:
386 case JVM_REF_newInvokeSpecial:
387 check_property(
388 tag.is_method(),
389 "Invalid constant pool index %u in class file %s (not a method)",
390 ref_index, CHECK_(nullHandle));
391 break;
392 case JVM_REF_invokeInterface:
393 check_property(
394 tag.is_interface_method(),
395 "Invalid constant pool index %u in class file %s (not an interface method)",
396 ref_index, CHECK_(nullHandle));
397 break;
398 default:
399 classfile_parse_error(
400 "Bad method handle kind at constant pool index %u in class file %s",
401 index, CHECK_(nullHandle));
402 }
403 // Keep the ref_index unchanged. It will be indirected at link-time.
404 }
405 break;
406 case JVM_CONSTANT_MethodType :
407 {
408 int ref_index = cp->method_type_index_at(index);
409 check_property(
410 valid_cp_range(ref_index, length) &&
411 cp->tag_at(ref_index).is_utf8() &&
412 EnableMethodHandles,
413 "Invalid constant pool index %u in class file %s",
414 ref_index, CHECK_(nullHandle));
415 }
416 break;
417 default:
418 fatal(err_msg("bad constant pool tag value %u",
419 cp->tag_at(index).value()));
420 ShouldNotReachHere();
421 break;
422 } // end of switch
423 } // end of for
425 if (_cp_patches != NULL) {
426 // need to treat this_class specially...
427 assert(AnonymousClasses, "");
428 int this_class_index;
429 {
430 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
431 u1* mark = cfs->current();
432 u2 flags = cfs->get_u2_fast();
433 this_class_index = cfs->get_u2_fast();
434 cfs->set_current(mark); // revert to mark
435 }
437 for (index = 1; index < length; index++) { // Index 0 is unused
438 if (has_cp_patch_at(index)) {
439 guarantee_property(index != this_class_index,
440 "Illegal constant pool patch to self at %d in class file %s",
441 index, CHECK_(nullHandle));
442 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
443 }
444 }
445 // Ensure that all the patches have been used.
446 for (index = 0; index < _cp_patches->length(); index++) {
447 guarantee_property(!has_cp_patch_at(index),
448 "Unused constant pool patch at %d in class file %s",
449 index, CHECK_(nullHandle));
450 }
451 }
453 if (!_need_verify) {
454 return cp;
455 }
457 // second verification pass - checks the strings are of the right format.
458 // but not yet to the other entries
459 for (index = 1; index < length; index++) {
460 jbyte tag = cp->tag_at(index).value();
461 switch (tag) {
462 case JVM_CONSTANT_UnresolvedClass: {
463 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
464 // check the name, even if _cp_patches will overwrite it
465 verify_legal_class_name(class_name, CHECK_(nullHandle));
466 break;
467 }
468 case JVM_CONSTANT_NameAndType: {
469 if (_need_verify && _major_version >= JAVA_7_VERSION) {
470 int sig_index = cp->signature_ref_index_at(index);
471 int name_index = cp->name_ref_index_at(index);
472 symbolHandle name(THREAD, cp->symbol_at(name_index));
473 symbolHandle sig(THREAD, cp->symbol_at(sig_index));
474 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
475 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
476 } else {
477 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
478 }
479 }
480 break;
481 }
482 case JVM_CONSTANT_Fieldref:
483 case JVM_CONSTANT_Methodref:
484 case JVM_CONSTANT_InterfaceMethodref: {
485 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
486 // already verified to be utf8
487 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
488 // already verified to be utf8
489 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
490 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
491 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
492 if (tag == JVM_CONSTANT_Fieldref) {
493 verify_legal_field_name(name, CHECK_(nullHandle));
494 if (_need_verify && _major_version >= JAVA_7_VERSION) {
495 // Signature is verified above, when iterating NameAndType_info.
496 // Need only to be sure it's the right type.
497 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
498 throwIllegalSignature(
499 "Field", name, signature, CHECK_(nullHandle));
500 }
501 } else {
502 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
503 }
504 } else {
505 verify_legal_method_name(name, CHECK_(nullHandle));
506 if (_need_verify && _major_version >= JAVA_7_VERSION) {
507 // Signature is verified above, when iterating NameAndType_info.
508 // Need only to be sure it's the right type.
509 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
510 throwIllegalSignature(
511 "Method", name, signature, CHECK_(nullHandle));
512 }
513 } else {
514 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
515 }
516 if (tag == JVM_CONSTANT_Methodref) {
517 // 4509014: If a class method name begins with '<', it must be "<init>".
518 assert(!name.is_null(), "method name in constant pool is null");
519 unsigned int name_len = name->utf8_length();
520 assert(name_len > 0, "bad method name"); // already verified as legal name
521 if (name->byte_at(0) == '<') {
522 if (name() != vmSymbols::object_initializer_name()) {
523 classfile_parse_error(
524 "Bad method name at constant pool index %u in class file %s",
525 name_ref_index, CHECK_(nullHandle));
526 }
527 }
528 }
529 }
530 break;
531 }
532 case JVM_CONSTANT_MethodHandle: {
533 int ref_index = cp->method_handle_index_at(index);
534 int ref_kind = cp->method_handle_ref_kind_at(index);
535 switch (ref_kind) {
536 case JVM_REF_invokeVirtual:
537 case JVM_REF_invokeStatic:
538 case JVM_REF_invokeSpecial:
539 case JVM_REF_newInvokeSpecial:
540 {
541 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
542 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
543 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
544 if (ref_kind == JVM_REF_newInvokeSpecial) {
545 if (name() != vmSymbols::object_initializer_name()) {
546 classfile_parse_error(
547 "Bad constructor name at constant pool index %u in class file %s",
548 name_ref_index, CHECK_(nullHandle));
549 }
550 } else {
551 if (name() == vmSymbols::object_initializer_name()) {
552 classfile_parse_error(
553 "Bad method name at constant pool index %u in class file %s",
554 name_ref_index, CHECK_(nullHandle));
555 }
556 }
557 }
558 break;
559 // Other ref_kinds are already fully checked in previous pass.
560 }
561 break;
562 }
563 case JVM_CONSTANT_MethodType: {
564 symbolHandle no_name = vmSymbolHandles::type_name(); // place holder
565 symbolHandle signature(THREAD, cp->method_type_signature_at(index));
566 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
567 break;
568 }
569 } // end of switch
570 } // end of for
572 return cp;
573 }
576 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
577 assert(AnonymousClasses, "");
578 BasicType patch_type = T_VOID;
579 switch (cp->tag_at(index).value()) {
581 case JVM_CONSTANT_UnresolvedClass :
582 // Patching a class means pre-resolving it.
583 // The name in the constant pool is ignored.
584 if (java_lang_Class::is_instance(patch())) {
585 guarantee_property(!java_lang_Class::is_primitive(patch()),
586 "Illegal class patch at %d in class file %s",
587 index, CHECK);
588 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
589 } else {
590 guarantee_property(java_lang_String::is_instance(patch()),
591 "Illegal class patch at %d in class file %s",
592 index, CHECK);
593 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
594 cp->unresolved_klass_at_put(index, name());
595 }
596 break;
598 case JVM_CONSTANT_UnresolvedString :
599 // Patching a string means pre-resolving it.
600 // The spelling in the constant pool is ignored.
601 // The constant reference may be any object whatever.
602 // If it is not a real interned string, the constant is referred
603 // to as a "pseudo-string", and must be presented to the CP
604 // explicitly, because it may require scavenging.
605 cp->pseudo_string_at_put(index, patch());
606 break;
608 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
609 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
610 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
611 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
612 patch_prim:
613 {
614 jvalue value;
615 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
616 guarantee_property(value_type == patch_type,
617 "Illegal primitive patch at %d in class file %s",
618 index, CHECK);
619 switch (value_type) {
620 case T_INT: cp->int_at_put(index, value.i); break;
621 case T_FLOAT: cp->float_at_put(index, value.f); break;
622 case T_LONG: cp->long_at_put(index, value.j); break;
623 case T_DOUBLE: cp->double_at_put(index, value.d); break;
624 default: assert(false, "");
625 }
626 }
627 break;
629 default:
630 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
631 guarantee_property(!has_cp_patch_at(index),
632 "Illegal unexpected patch at %d in class file %s",
633 index, CHECK);
634 return;
635 }
637 // On fall-through, mark the patch as used.
638 clear_cp_patch_at(index);
639 }
643 class NameSigHash: public ResourceObj {
644 public:
645 symbolOop _name; // name
646 symbolOop _sig; // signature
647 NameSigHash* _next; // Next entry in hash table
648 };
651 #define HASH_ROW_SIZE 256
653 unsigned int hash(symbolOop name, symbolOop sig) {
654 unsigned int raw_hash = 0;
655 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
656 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
658 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
659 }
662 void initialize_hashtable(NameSigHash** table) {
663 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
664 }
666 // Return false if the name/sig combination is found in table.
667 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
668 // The old format checker uses heap sort to find duplicates.
669 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
670 // of table since we don't expect symbolOop's to move.
671 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
672 assert(name != NULL, "name in constant pool is NULL");
674 // First lookup for duplicates
675 int index = hash(name, sig);
676 NameSigHash* entry = table[index];
677 while (entry != NULL) {
678 if (entry->_name == name && entry->_sig == sig) {
679 return false;
680 }
681 entry = entry->_next;
682 }
684 // No duplicate is found, allocate a new entry and fill it.
685 entry = new NameSigHash();
686 entry->_name = name;
687 entry->_sig = sig;
689 // Insert into hash table
690 entry->_next = table[index];
691 table[index] = entry;
693 return true;
694 }
697 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
698 int length,
699 Handle class_loader,
700 Handle protection_domain,
701 symbolHandle class_name,
702 TRAPS) {
703 ClassFileStream* cfs = stream();
704 assert(length > 0, "only called for length>0");
705 objArrayHandle nullHandle;
706 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
707 objArrayHandle interfaces (THREAD, interface_oop);
709 int index;
710 for (index = 0; index < length; index++) {
711 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
712 KlassHandle interf;
713 check_property(
714 valid_cp_range(interface_index, cp->length()) &&
715 is_klass_reference(cp, interface_index),
716 "Interface name has bad constant pool index %u in class file %s",
717 interface_index, CHECK_(nullHandle));
718 if (cp->tag_at(interface_index).is_klass()) {
719 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
720 } else {
721 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
723 // Don't need to check legal name because it's checked when parsing constant pool.
724 // But need to make sure it's not an array type.
725 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
726 "Bad interface name in class file %s", CHECK_(nullHandle));
728 // Call resolve_super so classcircularity is checked
729 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
730 unresolved_klass, class_loader, protection_domain,
731 false, CHECK_(nullHandle));
732 interf = KlassHandle(THREAD, k);
734 if (LinkWellKnownClasses) // my super type is well known to me
735 cp->klass_at_put(interface_index, interf()); // eagerly resolve
736 }
738 if (!Klass::cast(interf())->is_interface()) {
739 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
740 }
741 interfaces->obj_at_put(index, interf());
742 }
744 if (!_need_verify || length <= 1) {
745 return interfaces;
746 }
748 // Check if there's any duplicates in interfaces
749 ResourceMark rm(THREAD);
750 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
751 THREAD, NameSigHash*, HASH_ROW_SIZE);
752 initialize_hashtable(interface_names);
753 bool dup = false;
754 {
755 debug_only(No_Safepoint_Verifier nsv;)
756 for (index = 0; index < length; index++) {
757 klassOop k = (klassOop)interfaces->obj_at(index);
758 symbolOop name = instanceKlass::cast(k)->name();
759 // If no duplicates, add (name, NULL) in hashtable interface_names.
760 if (!put_after_lookup(name, NULL, interface_names)) {
761 dup = true;
762 break;
763 }
764 }
765 }
766 if (dup) {
767 classfile_parse_error("Duplicate interface name in class file %s",
768 CHECK_(nullHandle));
769 }
771 return interfaces;
772 }
775 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
776 // Make sure the constant pool entry is of a type appropriate to this field
777 guarantee_property(
778 (constantvalue_index > 0 &&
779 constantvalue_index < cp->length()),
780 "Bad initial value index %u in ConstantValue attribute in class file %s",
781 constantvalue_index, CHECK);
782 constantTag value_type = cp->tag_at(constantvalue_index);
783 switch ( cp->basic_type_for_signature_at(signature_index) ) {
784 case T_LONG:
785 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
786 break;
787 case T_FLOAT:
788 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
789 break;
790 case T_DOUBLE:
791 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
792 break;
793 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
794 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
795 break;
796 case T_OBJECT:
797 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
798 && (value_type.is_string() || value_type.is_unresolved_string())),
799 "Bad string initial value in class file %s", CHECK);
800 break;
801 default:
802 classfile_parse_error(
803 "Unable to set initial value %u in class file %s",
804 constantvalue_index, CHECK);
805 }
806 }
809 // Parse attributes for a field.
810 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
811 u2 attributes_count,
812 bool is_static, u2 signature_index,
813 u2* constantvalue_index_addr,
814 bool* is_synthetic_addr,
815 u2* generic_signature_index_addr,
816 typeArrayHandle* field_annotations,
817 TRAPS) {
818 ClassFileStream* cfs = stream();
819 assert(attributes_count > 0, "length should be greater than 0");
820 u2 constantvalue_index = 0;
821 u2 generic_signature_index = 0;
822 bool is_synthetic = false;
823 u1* runtime_visible_annotations = NULL;
824 int runtime_visible_annotations_length = 0;
825 u1* runtime_invisible_annotations = NULL;
826 int runtime_invisible_annotations_length = 0;
827 while (attributes_count--) {
828 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
829 u2 attribute_name_index = cfs->get_u2_fast();
830 u4 attribute_length = cfs->get_u4_fast();
831 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
832 cp->tag_at(attribute_name_index).is_utf8(),
833 "Invalid field attribute index %u in class file %s",
834 attribute_name_index,
835 CHECK);
836 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
837 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
838 // ignore if non-static
839 if (constantvalue_index != 0) {
840 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
841 }
842 check_property(
843 attribute_length == 2,
844 "Invalid ConstantValue field attribute length %u in class file %s",
845 attribute_length, CHECK);
846 constantvalue_index = cfs->get_u2(CHECK);
847 if (_need_verify) {
848 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
849 }
850 } else if (attribute_name == vmSymbols::tag_synthetic()) {
851 if (attribute_length != 0) {
852 classfile_parse_error(
853 "Invalid Synthetic field attribute length %u in class file %s",
854 attribute_length, CHECK);
855 }
856 is_synthetic = true;
857 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
858 if (attribute_length != 0) {
859 classfile_parse_error(
860 "Invalid Deprecated field attribute length %u in class file %s",
861 attribute_length, CHECK);
862 }
863 } else if (_major_version >= JAVA_1_5_VERSION) {
864 if (attribute_name == vmSymbols::tag_signature()) {
865 if (attribute_length != 2) {
866 classfile_parse_error(
867 "Wrong size %u for field's Signature attribute in class file %s",
868 attribute_length, CHECK);
869 }
870 generic_signature_index = cfs->get_u2(CHECK);
871 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
872 runtime_visible_annotations_length = attribute_length;
873 runtime_visible_annotations = cfs->get_u1_buffer();
874 assert(runtime_visible_annotations != NULL, "null visible annotations");
875 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
876 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
877 runtime_invisible_annotations_length = attribute_length;
878 runtime_invisible_annotations = cfs->get_u1_buffer();
879 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
880 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
881 } else {
882 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
883 }
884 } else {
885 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
886 }
887 }
889 *constantvalue_index_addr = constantvalue_index;
890 *is_synthetic_addr = is_synthetic;
891 *generic_signature_index_addr = generic_signature_index;
892 *field_annotations = assemble_annotations(runtime_visible_annotations,
893 runtime_visible_annotations_length,
894 runtime_invisible_annotations,
895 runtime_invisible_annotations_length,
896 CHECK);
897 return;
898 }
901 // Field allocation types. Used for computing field offsets.
903 enum FieldAllocationType {
904 STATIC_OOP, // Oops
905 STATIC_BYTE, // Boolean, Byte, char
906 STATIC_SHORT, // shorts
907 STATIC_WORD, // ints
908 STATIC_DOUBLE, // long or double
909 STATIC_ALIGNED_DOUBLE,// aligned long or double
910 NONSTATIC_OOP,
911 NONSTATIC_BYTE,
912 NONSTATIC_SHORT,
913 NONSTATIC_WORD,
914 NONSTATIC_DOUBLE,
915 NONSTATIC_ALIGNED_DOUBLE
916 };
919 struct FieldAllocationCount {
920 unsigned int static_oop_count;
921 unsigned int static_byte_count;
922 unsigned int static_short_count;
923 unsigned int static_word_count;
924 unsigned int static_double_count;
925 unsigned int nonstatic_oop_count;
926 unsigned int nonstatic_byte_count;
927 unsigned int nonstatic_short_count;
928 unsigned int nonstatic_word_count;
929 unsigned int nonstatic_double_count;
930 };
932 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
933 struct FieldAllocationCount *fac,
934 objArrayHandle* fields_annotations, TRAPS) {
935 ClassFileStream* cfs = stream();
936 typeArrayHandle nullHandle;
937 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
938 u2 length = cfs->get_u2_fast();
939 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
940 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
941 typeArrayHandle fields(THREAD, new_fields);
943 int index = 0;
944 typeArrayHandle field_annotations;
945 for (int n = 0; n < length; n++) {
946 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
948 AccessFlags access_flags;
949 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
950 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
951 access_flags.set_flags(flags);
953 u2 name_index = cfs->get_u2_fast();
954 int cp_size = cp->length();
955 check_property(
956 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
957 "Invalid constant pool index %u for field name in class file %s",
958 name_index, CHECK_(nullHandle));
959 symbolHandle name(THREAD, cp->symbol_at(name_index));
960 verify_legal_field_name(name, CHECK_(nullHandle));
962 u2 signature_index = cfs->get_u2_fast();
963 check_property(
964 valid_cp_range(signature_index, cp_size) &&
965 cp->tag_at(signature_index).is_utf8(),
966 "Invalid constant pool index %u for field signature in class file %s",
967 signature_index, CHECK_(nullHandle));
968 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
969 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
971 u2 constantvalue_index = 0;
972 bool is_synthetic = false;
973 u2 generic_signature_index = 0;
974 bool is_static = access_flags.is_static();
976 u2 attributes_count = cfs->get_u2_fast();
977 if (attributes_count > 0) {
978 parse_field_attributes(cp, attributes_count, is_static, signature_index,
979 &constantvalue_index, &is_synthetic,
980 &generic_signature_index, &field_annotations,
981 CHECK_(nullHandle));
982 if (field_annotations.not_null()) {
983 if (fields_annotations->is_null()) {
984 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
985 *fields_annotations = objArrayHandle(THREAD, md);
986 }
987 (*fields_annotations)->obj_at_put(n, field_annotations());
988 }
989 if (is_synthetic) {
990 access_flags.set_is_synthetic();
991 }
992 }
994 fields->short_at_put(index++, access_flags.as_short());
995 fields->short_at_put(index++, name_index);
996 fields->short_at_put(index++, signature_index);
997 fields->short_at_put(index++, constantvalue_index);
999 // Remember how many oops we encountered and compute allocation type
1000 BasicType type = cp->basic_type_for_signature_at(signature_index);
1001 FieldAllocationType atype;
1002 if ( is_static ) {
1003 switch ( type ) {
1004 case T_BOOLEAN:
1005 case T_BYTE:
1006 fac->static_byte_count++;
1007 atype = STATIC_BYTE;
1008 break;
1009 case T_LONG:
1010 case T_DOUBLE:
1011 if (Universe::field_type_should_be_aligned(type)) {
1012 atype = STATIC_ALIGNED_DOUBLE;
1013 } else {
1014 atype = STATIC_DOUBLE;
1015 }
1016 fac->static_double_count++;
1017 break;
1018 case T_CHAR:
1019 case T_SHORT:
1020 fac->static_short_count++;
1021 atype = STATIC_SHORT;
1022 break;
1023 case T_FLOAT:
1024 case T_INT:
1025 fac->static_word_count++;
1026 atype = STATIC_WORD;
1027 break;
1028 case T_ARRAY:
1029 case T_OBJECT:
1030 fac->static_oop_count++;
1031 atype = STATIC_OOP;
1032 break;
1033 case T_ADDRESS:
1034 case T_VOID:
1035 default:
1036 assert(0, "bad field type");
1037 }
1038 } else {
1039 switch ( type ) {
1040 case T_BOOLEAN:
1041 case T_BYTE:
1042 fac->nonstatic_byte_count++;
1043 atype = NONSTATIC_BYTE;
1044 break;
1045 case T_LONG:
1046 case T_DOUBLE:
1047 if (Universe::field_type_should_be_aligned(type)) {
1048 atype = NONSTATIC_ALIGNED_DOUBLE;
1049 } else {
1050 atype = NONSTATIC_DOUBLE;
1051 }
1052 fac->nonstatic_double_count++;
1053 break;
1054 case T_CHAR:
1055 case T_SHORT:
1056 fac->nonstatic_short_count++;
1057 atype = NONSTATIC_SHORT;
1058 break;
1059 case T_FLOAT:
1060 case T_INT:
1061 fac->nonstatic_word_count++;
1062 atype = NONSTATIC_WORD;
1063 break;
1064 case T_ARRAY:
1065 case T_OBJECT:
1066 fac->nonstatic_oop_count++;
1067 atype = NONSTATIC_OOP;
1068 break;
1069 case T_ADDRESS:
1070 case T_VOID:
1071 default:
1072 assert(0, "bad field type");
1073 }
1074 }
1076 // The correct offset is computed later (all oop fields will be located together)
1077 // We temporarily store the allocation type in the offset field
1078 fields->short_at_put(index++, atype);
1079 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1080 fields->short_at_put(index++, generic_signature_index);
1081 }
1083 if (_need_verify && length > 1) {
1084 // Check duplicated fields
1085 ResourceMark rm(THREAD);
1086 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1087 THREAD, NameSigHash*, HASH_ROW_SIZE);
1088 initialize_hashtable(names_and_sigs);
1089 bool dup = false;
1090 {
1091 debug_only(No_Safepoint_Verifier nsv;)
1092 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1093 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1094 symbolOop name = cp->symbol_at(name_index);
1095 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1096 symbolOop sig = cp->symbol_at(sig_index);
1097 // If no duplicates, add name/signature in hashtable names_and_sigs.
1098 if (!put_after_lookup(name, sig, names_and_sigs)) {
1099 dup = true;
1100 break;
1101 }
1102 }
1103 }
1104 if (dup) {
1105 classfile_parse_error("Duplicate field name&signature in class file %s",
1106 CHECK_(nullHandle));
1107 }
1108 }
1110 return fields;
1111 }
1114 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1115 while (length-- > 0) {
1116 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1117 }
1118 }
1121 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1122 u4 exception_table_length,
1123 constantPoolHandle cp,
1124 TRAPS) {
1125 ClassFileStream* cfs = stream();
1126 typeArrayHandle nullHandle;
1128 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1129 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1130 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1132 int index = 0;
1133 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1134 for (unsigned int i = 0; i < exception_table_length; i++) {
1135 u2 start_pc = cfs->get_u2_fast();
1136 u2 end_pc = cfs->get_u2_fast();
1137 u2 handler_pc = cfs->get_u2_fast();
1138 u2 catch_type_index = cfs->get_u2_fast();
1139 // Will check legal target after parsing code array in verifier.
1140 if (_need_verify) {
1141 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1142 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1143 guarantee_property(handler_pc < code_length,
1144 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1145 if (catch_type_index != 0) {
1146 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1147 is_klass_reference(cp, catch_type_index),
1148 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1149 }
1150 }
1151 exception_handlers->int_at_put(index++, start_pc);
1152 exception_handlers->int_at_put(index++, end_pc);
1153 exception_handlers->int_at_put(index++, handler_pc);
1154 exception_handlers->int_at_put(index++, catch_type_index);
1155 }
1156 return exception_handlers;
1157 }
1159 void ClassFileParser::parse_linenumber_table(
1160 u4 code_attribute_length, u4 code_length,
1161 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1162 ClassFileStream* cfs = stream();
1163 unsigned int num_entries = cfs->get_u2(CHECK);
1165 // Each entry is a u2 start_pc, and a u2 line_number
1166 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1168 // Verify line number attribute and table length
1169 check_property(
1170 code_attribute_length == sizeof(u2) + length_in_bytes,
1171 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1173 cfs->guarantee_more(length_in_bytes, CHECK);
1175 if ((*write_stream) == NULL) {
1176 if (length_in_bytes > fixed_buffer_size) {
1177 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1178 } else {
1179 (*write_stream) = new CompressedLineNumberWriteStream(
1180 linenumbertable_buffer, fixed_buffer_size);
1181 }
1182 }
1184 while (num_entries-- > 0) {
1185 u2 bci = cfs->get_u2_fast(); // start_pc
1186 u2 line = cfs->get_u2_fast(); // line_number
1187 guarantee_property(bci < code_length,
1188 "Invalid pc in LineNumberTable in class file %s", CHECK);
1189 (*write_stream)->write_pair(bci, line);
1190 }
1191 }
1194 // Class file LocalVariableTable elements.
1195 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1196 public:
1197 u2 start_bci;
1198 u2 length;
1199 u2 name_cp_index;
1200 u2 descriptor_cp_index;
1201 u2 slot;
1202 };
1205 class LVT_Hash: public CHeapObj {
1206 public:
1207 LocalVariableTableElement *_elem; // element
1208 LVT_Hash* _next; // Next entry in hash table
1209 };
1211 unsigned int hash(LocalVariableTableElement *elem) {
1212 unsigned int raw_hash = elem->start_bci;
1214 raw_hash = elem->length + raw_hash * 37;
1215 raw_hash = elem->name_cp_index + raw_hash * 37;
1216 raw_hash = elem->slot + raw_hash * 37;
1218 return raw_hash % HASH_ROW_SIZE;
1219 }
1221 void initialize_hashtable(LVT_Hash** table) {
1222 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1223 table[i] = NULL;
1224 }
1225 }
1227 void clear_hashtable(LVT_Hash** table) {
1228 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1229 LVT_Hash* current = table[i];
1230 LVT_Hash* next;
1231 while (current != NULL) {
1232 next = current->_next;
1233 current->_next = NULL;
1234 delete(current);
1235 current = next;
1236 }
1237 table[i] = NULL;
1238 }
1239 }
1241 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1242 LVT_Hash* entry = table[index];
1244 /*
1245 * 3-tuple start_bci/length/slot has to be unique key,
1246 * so the following comparison seems to be redundant:
1247 * && elem->name_cp_index == entry->_elem->name_cp_index
1248 */
1249 while (entry != NULL) {
1250 if (elem->start_bci == entry->_elem->start_bci
1251 && elem->length == entry->_elem->length
1252 && elem->name_cp_index == entry->_elem->name_cp_index
1253 && elem->slot == entry->_elem->slot
1254 ) {
1255 return entry;
1256 }
1257 entry = entry->_next;
1258 }
1259 return NULL;
1260 }
1262 // Return false if the local variable is found in table.
1263 // Return true if no duplicate is found.
1264 // And local variable is added as a new entry in table.
1265 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1266 // First lookup for duplicates
1267 int index = hash(elem);
1268 LVT_Hash* entry = LVT_lookup(elem, index, table);
1270 if (entry != NULL) {
1271 return false;
1272 }
1273 // No duplicate is found, allocate a new entry and fill it.
1274 if ((entry = new LVT_Hash()) == NULL) {
1275 return false;
1276 }
1277 entry->_elem = elem;
1279 // Insert into hash table
1280 entry->_next = table[index];
1281 table[index] = entry;
1283 return true;
1284 }
1286 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1287 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1288 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1289 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1290 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1291 lvt->signature_cp_index = 0;
1292 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1293 }
1295 // Function is used to parse both attributes:
1296 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1297 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1298 u2 max_locals,
1299 u4 code_attribute_length,
1300 constantPoolHandle cp,
1301 u2* localvariable_table_length,
1302 bool isLVTT,
1303 TRAPS) {
1304 ClassFileStream* cfs = stream();
1305 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1306 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1307 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1308 // Verify local variable table attribute has right length
1309 if (_need_verify) {
1310 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1311 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1312 }
1313 u2* localvariable_table_start = cfs->get_u2_buffer();
1314 assert(localvariable_table_start != NULL, "null local variable table");
1315 if (!_need_verify) {
1316 cfs->skip_u2_fast(size);
1317 } else {
1318 cfs->guarantee_more(size * 2, CHECK_NULL);
1319 for(int i = 0; i < (*localvariable_table_length); i++) {
1320 u2 start_pc = cfs->get_u2_fast();
1321 u2 length = cfs->get_u2_fast();
1322 u2 name_index = cfs->get_u2_fast();
1323 u2 descriptor_index = cfs->get_u2_fast();
1324 u2 index = cfs->get_u2_fast();
1325 // Assign to a u4 to avoid overflow
1326 u4 end_pc = (u4)start_pc + (u4)length;
1328 if (start_pc >= code_length) {
1329 classfile_parse_error(
1330 "Invalid start_pc %u in %s in class file %s",
1331 start_pc, tbl_name, CHECK_NULL);
1332 }
1333 if (end_pc > code_length) {
1334 classfile_parse_error(
1335 "Invalid length %u in %s in class file %s",
1336 length, tbl_name, CHECK_NULL);
1337 }
1338 int cp_size = cp->length();
1339 guarantee_property(
1340 valid_cp_range(name_index, cp_size) &&
1341 cp->tag_at(name_index).is_utf8(),
1342 "Name index %u in %s has bad constant type in class file %s",
1343 name_index, tbl_name, CHECK_NULL);
1344 guarantee_property(
1345 valid_cp_range(descriptor_index, cp_size) &&
1346 cp->tag_at(descriptor_index).is_utf8(),
1347 "Signature index %u in %s has bad constant type in class file %s",
1348 descriptor_index, tbl_name, CHECK_NULL);
1350 symbolHandle name(THREAD, cp->symbol_at(name_index));
1351 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1352 verify_legal_field_name(name, CHECK_NULL);
1353 u2 extra_slot = 0;
1354 if (!isLVTT) {
1355 verify_legal_field_signature(name, sig, CHECK_NULL);
1357 // 4894874: check special cases for double and long local variables
1358 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1359 sig() == vmSymbols::type_signature(T_LONG)) {
1360 extra_slot = 1;
1361 }
1362 }
1363 guarantee_property((index + extra_slot) < max_locals,
1364 "Invalid index %u in %s in class file %s",
1365 index, tbl_name, CHECK_NULL);
1366 }
1367 }
1368 return localvariable_table_start;
1369 }
1372 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1373 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1374 ClassFileStream* cfs = stream();
1375 u2 index = 0; // index in the array with long/double occupying two slots
1376 u4 i1 = *u1_index;
1377 u4 i2 = *u2_index + 1;
1378 for(int i = 0; i < array_length; i++) {
1379 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1380 index++;
1381 if (tag == ITEM_Long || tag == ITEM_Double) {
1382 index++;
1383 } else if (tag == ITEM_Object) {
1384 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1385 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1386 is_klass_reference(cp, class_index),
1387 "Bad class index %u in StackMap in class file %s",
1388 class_index, CHECK);
1389 } else if (tag == ITEM_Uninitialized) {
1390 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1391 guarantee_property(
1392 offset < code_length,
1393 "Bad uninitialized type offset %u in StackMap in class file %s",
1394 offset, CHECK);
1395 } else {
1396 guarantee_property(
1397 tag <= (u1)ITEM_Uninitialized,
1398 "Unknown variable type %u in StackMap in class file %s",
1399 tag, CHECK);
1400 }
1401 }
1402 u2_array[*u2_index] = index;
1403 *u1_index = i1;
1404 *u2_index = i2;
1405 }
1407 typeArrayOop ClassFileParser::parse_stackmap_table(
1408 u4 code_attribute_length, TRAPS) {
1409 if (code_attribute_length == 0)
1410 return NULL;
1412 ClassFileStream* cfs = stream();
1413 u1* stackmap_table_start = cfs->get_u1_buffer();
1414 assert(stackmap_table_start != NULL, "null stackmap table");
1416 // check code_attribute_length first
1417 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1419 if (!_need_verify && !DumpSharedSpaces) {
1420 return NULL;
1421 }
1423 typeArrayOop stackmap_data =
1424 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1426 stackmap_data->set_length(code_attribute_length);
1427 memcpy((void*)stackmap_data->byte_at_addr(0),
1428 (void*)stackmap_table_start, code_attribute_length);
1429 return stackmap_data;
1430 }
1432 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1433 u4 method_attribute_length,
1434 constantPoolHandle cp, TRAPS) {
1435 ClassFileStream* cfs = stream();
1436 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1437 *checked_exceptions_length = cfs->get_u2_fast();
1438 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1439 u2* checked_exceptions_start = cfs->get_u2_buffer();
1440 assert(checked_exceptions_start != NULL, "null checked exceptions");
1441 if (!_need_verify) {
1442 cfs->skip_u2_fast(size);
1443 } else {
1444 // Verify each value in the checked exception table
1445 u2 checked_exception;
1446 u2 len = *checked_exceptions_length;
1447 cfs->guarantee_more(2 * len, CHECK_NULL);
1448 for (int i = 0; i < len; i++) {
1449 checked_exception = cfs->get_u2_fast();
1450 check_property(
1451 valid_cp_range(checked_exception, cp->length()) &&
1452 is_klass_reference(cp, checked_exception),
1453 "Exception name has bad type at constant pool %u in class file %s",
1454 checked_exception, CHECK_NULL);
1455 }
1456 }
1457 // check exceptions attribute length
1458 if (_need_verify) {
1459 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1460 sizeof(u2) * size),
1461 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1462 }
1463 return checked_exceptions_start;
1464 }
1466 void ClassFileParser::throwIllegalSignature(
1467 const char* type, symbolHandle name, symbolHandle sig, TRAPS) {
1468 ResourceMark rm(THREAD);
1469 Exceptions::fthrow(THREAD_AND_LOCATION,
1470 vmSymbols::java_lang_ClassFormatError(),
1471 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1472 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1473 }
1475 #define MAX_ARGS_SIZE 255
1476 #define MAX_CODE_SIZE 65535
1477 #define INITIAL_MAX_LVT_NUMBER 256
1479 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1480 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1481 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1482 // entire method attribute is parsed.
1483 //
1484 // The promoted_flags parameter is used to pass relevant access_flags
1485 // from the method back up to the containing klass. These flag values
1486 // are added to klass's access_flags.
1488 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1489 AccessFlags *promoted_flags,
1490 typeArrayHandle* method_annotations,
1491 typeArrayHandle* method_parameter_annotations,
1492 typeArrayHandle* method_default_annotations,
1493 TRAPS) {
1494 ClassFileStream* cfs = stream();
1495 methodHandle nullHandle;
1496 ResourceMark rm(THREAD);
1497 // Parse fixed parts
1498 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1500 int flags = cfs->get_u2_fast();
1501 u2 name_index = cfs->get_u2_fast();
1502 int cp_size = cp->length();
1503 check_property(
1504 valid_cp_range(name_index, cp_size) &&
1505 cp->tag_at(name_index).is_utf8(),
1506 "Illegal constant pool index %u for method name in class file %s",
1507 name_index, CHECK_(nullHandle));
1508 symbolHandle name(THREAD, cp->symbol_at(name_index));
1509 verify_legal_method_name(name, CHECK_(nullHandle));
1511 u2 signature_index = cfs->get_u2_fast();
1512 guarantee_property(
1513 valid_cp_range(signature_index, cp_size) &&
1514 cp->tag_at(signature_index).is_utf8(),
1515 "Illegal constant pool index %u for method signature in class file %s",
1516 signature_index, CHECK_(nullHandle));
1517 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1519 AccessFlags access_flags;
1520 if (name == vmSymbols::class_initializer_name()) {
1521 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1522 flags = JVM_ACC_STATIC;
1523 } else {
1524 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1525 }
1527 int args_size = -1; // only used when _need_verify is true
1528 if (_need_verify) {
1529 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1530 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1531 if (args_size > MAX_ARGS_SIZE) {
1532 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1533 }
1534 }
1536 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1538 // Default values for code and exceptions attribute elements
1539 u2 max_stack = 0;
1540 u2 max_locals = 0;
1541 u4 code_length = 0;
1542 u1* code_start = 0;
1543 u2 exception_table_length = 0;
1544 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1545 u2 checked_exceptions_length = 0;
1546 u2* checked_exceptions_start = NULL;
1547 CompressedLineNumberWriteStream* linenumber_table = NULL;
1548 int linenumber_table_length = 0;
1549 int total_lvt_length = 0;
1550 u2 lvt_cnt = 0;
1551 u2 lvtt_cnt = 0;
1552 bool lvt_allocated = false;
1553 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1554 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1555 u2* localvariable_table_length;
1556 u2** localvariable_table_start;
1557 u2* localvariable_type_table_length;
1558 u2** localvariable_type_table_start;
1559 bool parsed_code_attribute = false;
1560 bool parsed_checked_exceptions_attribute = false;
1561 bool parsed_stackmap_attribute = false;
1562 // stackmap attribute - JDK1.5
1563 typeArrayHandle stackmap_data;
1564 u2 generic_signature_index = 0;
1565 u1* runtime_visible_annotations = NULL;
1566 int runtime_visible_annotations_length = 0;
1567 u1* runtime_invisible_annotations = NULL;
1568 int runtime_invisible_annotations_length = 0;
1569 u1* runtime_visible_parameter_annotations = NULL;
1570 int runtime_visible_parameter_annotations_length = 0;
1571 u1* runtime_invisible_parameter_annotations = NULL;
1572 int runtime_invisible_parameter_annotations_length = 0;
1573 u1* annotation_default = NULL;
1574 int annotation_default_length = 0;
1576 // Parse code and exceptions attribute
1577 u2 method_attributes_count = cfs->get_u2_fast();
1578 while (method_attributes_count--) {
1579 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1580 u2 method_attribute_name_index = cfs->get_u2_fast();
1581 u4 method_attribute_length = cfs->get_u4_fast();
1582 check_property(
1583 valid_cp_range(method_attribute_name_index, cp_size) &&
1584 cp->tag_at(method_attribute_name_index).is_utf8(),
1585 "Invalid method attribute name index %u in class file %s",
1586 method_attribute_name_index, CHECK_(nullHandle));
1588 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1589 if (method_attribute_name == vmSymbols::tag_code()) {
1590 // Parse Code attribute
1591 if (_need_verify) {
1592 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1593 "Code attribute in native or abstract methods in class file %s",
1594 CHECK_(nullHandle));
1595 }
1596 if (parsed_code_attribute) {
1597 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1598 }
1599 parsed_code_attribute = true;
1601 // Stack size, locals size, and code size
1602 if (_major_version == 45 && _minor_version <= 2) {
1603 cfs->guarantee_more(4, CHECK_(nullHandle));
1604 max_stack = cfs->get_u1_fast();
1605 max_locals = cfs->get_u1_fast();
1606 code_length = cfs->get_u2_fast();
1607 } else {
1608 cfs->guarantee_more(8, CHECK_(nullHandle));
1609 max_stack = cfs->get_u2_fast();
1610 max_locals = cfs->get_u2_fast();
1611 code_length = cfs->get_u4_fast();
1612 }
1613 if (_need_verify) {
1614 guarantee_property(args_size <= max_locals,
1615 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1616 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1617 "Invalid method Code length %u in class file %s",
1618 code_length, CHECK_(nullHandle));
1619 }
1620 // Code pointer
1621 code_start = cfs->get_u1_buffer();
1622 assert(code_start != NULL, "null code start");
1623 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1624 cfs->skip_u1_fast(code_length);
1626 // Exception handler table
1627 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1628 exception_table_length = cfs->get_u2_fast();
1629 if (exception_table_length > 0) {
1630 exception_handlers =
1631 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1632 }
1634 // Parse additional attributes in code attribute
1635 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1636 u2 code_attributes_count = cfs->get_u2_fast();
1638 unsigned int calculated_attribute_length = 0;
1640 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1641 calculated_attribute_length =
1642 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1643 } else {
1644 // max_stack, locals and length are smaller in pre-version 45.2 classes
1645 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1646 }
1647 calculated_attribute_length +=
1648 code_length +
1649 sizeof(exception_table_length) +
1650 sizeof(code_attributes_count) +
1651 exception_table_length *
1652 ( sizeof(u2) + // start_pc
1653 sizeof(u2) + // end_pc
1654 sizeof(u2) + // handler_pc
1655 sizeof(u2) ); // catch_type_index
1657 while (code_attributes_count--) {
1658 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1659 u2 code_attribute_name_index = cfs->get_u2_fast();
1660 u4 code_attribute_length = cfs->get_u4_fast();
1661 calculated_attribute_length += code_attribute_length +
1662 sizeof(code_attribute_name_index) +
1663 sizeof(code_attribute_length);
1664 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1665 cp->tag_at(code_attribute_name_index).is_utf8(),
1666 "Invalid code attribute name index %u in class file %s",
1667 code_attribute_name_index,
1668 CHECK_(nullHandle));
1669 if (LoadLineNumberTables &&
1670 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1671 // Parse and compress line number table
1672 parse_linenumber_table(code_attribute_length, code_length,
1673 &linenumber_table, CHECK_(nullHandle));
1675 } else if (LoadLocalVariableTables &&
1676 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1677 // Parse local variable table
1678 if (!lvt_allocated) {
1679 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1680 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1681 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1682 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1683 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1684 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1685 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1686 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1687 lvt_allocated = true;
1688 }
1689 if (lvt_cnt == max_lvt_cnt) {
1690 max_lvt_cnt <<= 1;
1691 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1692 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1693 }
1694 localvariable_table_start[lvt_cnt] =
1695 parse_localvariable_table(code_length,
1696 max_locals,
1697 code_attribute_length,
1698 cp,
1699 &localvariable_table_length[lvt_cnt],
1700 false, // is not LVTT
1701 CHECK_(nullHandle));
1702 total_lvt_length += localvariable_table_length[lvt_cnt];
1703 lvt_cnt++;
1704 } else if (LoadLocalVariableTypeTables &&
1705 _major_version >= JAVA_1_5_VERSION &&
1706 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1707 if (!lvt_allocated) {
1708 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1709 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1710 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1711 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1712 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1713 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1714 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1715 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1716 lvt_allocated = true;
1717 }
1718 // Parse local variable type table
1719 if (lvtt_cnt == max_lvtt_cnt) {
1720 max_lvtt_cnt <<= 1;
1721 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1722 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1723 }
1724 localvariable_type_table_start[lvtt_cnt] =
1725 parse_localvariable_table(code_length,
1726 max_locals,
1727 code_attribute_length,
1728 cp,
1729 &localvariable_type_table_length[lvtt_cnt],
1730 true, // is LVTT
1731 CHECK_(nullHandle));
1732 lvtt_cnt++;
1733 } else if (UseSplitVerifier &&
1734 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1735 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1736 // Stack map is only needed by the new verifier in JDK1.5.
1737 if (parsed_stackmap_attribute) {
1738 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1739 }
1740 typeArrayOop sm =
1741 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1742 stackmap_data = typeArrayHandle(THREAD, sm);
1743 parsed_stackmap_attribute = true;
1744 } else {
1745 // Skip unknown attributes
1746 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1747 }
1748 }
1749 // check method attribute length
1750 if (_need_verify) {
1751 guarantee_property(method_attribute_length == calculated_attribute_length,
1752 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1753 }
1754 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1755 // Parse Exceptions attribute
1756 if (parsed_checked_exceptions_attribute) {
1757 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1758 }
1759 parsed_checked_exceptions_attribute = true;
1760 checked_exceptions_start =
1761 parse_checked_exceptions(&checked_exceptions_length,
1762 method_attribute_length,
1763 cp, CHECK_(nullHandle));
1764 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1765 if (method_attribute_length != 0) {
1766 classfile_parse_error(
1767 "Invalid Synthetic method attribute length %u in class file %s",
1768 method_attribute_length, CHECK_(nullHandle));
1769 }
1770 // Should we check that there hasn't already been a synthetic attribute?
1771 access_flags.set_is_synthetic();
1772 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1773 if (method_attribute_length != 0) {
1774 classfile_parse_error(
1775 "Invalid Deprecated method attribute length %u in class file %s",
1776 method_attribute_length, CHECK_(nullHandle));
1777 }
1778 } else if (_major_version >= JAVA_1_5_VERSION) {
1779 if (method_attribute_name == vmSymbols::tag_signature()) {
1780 if (method_attribute_length != 2) {
1781 classfile_parse_error(
1782 "Invalid Signature attribute length %u in class file %s",
1783 method_attribute_length, CHECK_(nullHandle));
1784 }
1785 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1786 generic_signature_index = cfs->get_u2_fast();
1787 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1788 runtime_visible_annotations_length = method_attribute_length;
1789 runtime_visible_annotations = cfs->get_u1_buffer();
1790 assert(runtime_visible_annotations != NULL, "null visible annotations");
1791 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1792 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1793 runtime_invisible_annotations_length = method_attribute_length;
1794 runtime_invisible_annotations = cfs->get_u1_buffer();
1795 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1796 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1797 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1798 runtime_visible_parameter_annotations_length = method_attribute_length;
1799 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1800 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1801 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1802 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1803 runtime_invisible_parameter_annotations_length = method_attribute_length;
1804 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1805 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1806 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1807 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1808 annotation_default_length = method_attribute_length;
1809 annotation_default = cfs->get_u1_buffer();
1810 assert(annotation_default != NULL, "null annotation default");
1811 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1812 } else {
1813 // Skip unknown attributes
1814 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1815 }
1816 } else {
1817 // Skip unknown attributes
1818 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1819 }
1820 }
1822 if (linenumber_table != NULL) {
1823 linenumber_table->write_terminator();
1824 linenumber_table_length = linenumber_table->position();
1825 }
1827 // Make sure there's at least one Code attribute in non-native/non-abstract method
1828 if (_need_verify) {
1829 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1830 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1831 }
1833 // All sizing information for a methodOop is finally available, now create it
1834 methodOop m_oop = oopFactory::new_method(
1835 code_length, access_flags, linenumber_table_length,
1836 total_lvt_length, checked_exceptions_length,
1837 methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1838 methodHandle m (THREAD, m_oop);
1840 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1842 // Fill in information from fixed part (access_flags already set)
1843 m->set_constants(cp());
1844 m->set_name_index(name_index);
1845 m->set_signature_index(signature_index);
1846 m->set_generic_signature_index(generic_signature_index);
1847 #ifdef CC_INTERP
1848 // hmm is there a gc issue here??
1849 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1850 m->set_result_index(rtf.type());
1851 #endif
1853 if (args_size >= 0) {
1854 m->set_size_of_parameters(args_size);
1855 } else {
1856 m->compute_size_of_parameters(THREAD);
1857 }
1858 #ifdef ASSERT
1859 if (args_size >= 0) {
1860 m->compute_size_of_parameters(THREAD);
1861 assert(args_size == m->size_of_parameters(), "");
1862 }
1863 #endif
1865 // Fill in code attribute information
1866 m->set_max_stack(max_stack);
1867 m->set_max_locals(max_locals);
1868 m->constMethod()->set_stackmap_data(stackmap_data());
1870 /**
1871 * The exception_table field is the flag used to indicate
1872 * that the methodOop and it's associated constMethodOop are partially
1873 * initialized and thus are exempt from pre/post GC verification. Once
1874 * the field is set, the oops are considered fully initialized so make
1875 * sure that the oops can pass verification when this field is set.
1876 */
1877 m->set_exception_table(exception_handlers());
1879 // Copy byte codes
1880 m->set_code(code_start);
1882 // Copy line number table
1883 if (linenumber_table != NULL) {
1884 memcpy(m->compressed_linenumber_table(),
1885 linenumber_table->buffer(), linenumber_table_length);
1886 }
1888 // Copy checked exceptions
1889 if (checked_exceptions_length > 0) {
1890 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1891 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1892 }
1894 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1895 *
1896 * Rules for LVT's and LVTT's are:
1897 * - There can be any number of LVT's and LVTT's.
1898 * - If there are n LVT's, it is the same as if there was just
1899 * one LVT containing all the entries from the n LVT's.
1900 * - There may be no more than one LVT entry per local variable.
1901 * Two LVT entries are 'equal' if these fields are the same:
1902 * start_pc, length, name, slot
1903 * - There may be no more than one LVTT entry per each LVT entry.
1904 * Each LVTT entry has to match some LVT entry.
1905 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1906 */
1907 if (total_lvt_length > 0) {
1908 int tbl_no, idx;
1910 promoted_flags->set_has_localvariable_table();
1912 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1913 initialize_hashtable(lvt_Hash);
1915 // To fill LocalVariableTable in
1916 Classfile_LVT_Element* cf_lvt;
1917 LocalVariableTableElement* lvt = m->localvariable_table_start();
1919 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1920 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1921 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1922 copy_lvt_element(&cf_lvt[idx], lvt);
1923 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1924 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1925 && _need_verify
1926 && _major_version >= JAVA_1_5_VERSION ) {
1927 clear_hashtable(lvt_Hash);
1928 classfile_parse_error("Duplicated LocalVariableTable attribute "
1929 "entry for '%s' in class file %s",
1930 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1931 CHECK_(nullHandle));
1932 }
1933 }
1934 }
1936 // To merge LocalVariableTable and LocalVariableTypeTable
1937 Classfile_LVT_Element* cf_lvtt;
1938 LocalVariableTableElement lvtt_elem;
1940 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1941 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1942 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1943 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1944 int index = hash(&lvtt_elem);
1945 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1946 if (entry == NULL) {
1947 if (_need_verify) {
1948 clear_hashtable(lvt_Hash);
1949 classfile_parse_error("LVTT entry for '%s' in class file %s "
1950 "does not match any LVT entry",
1951 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1952 CHECK_(nullHandle));
1953 }
1954 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1955 clear_hashtable(lvt_Hash);
1956 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1957 "entry for '%s' in class file %s",
1958 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1959 CHECK_(nullHandle));
1960 } else {
1961 // to add generic signatures into LocalVariableTable
1962 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1963 }
1964 }
1965 }
1966 clear_hashtable(lvt_Hash);
1967 }
1969 *method_annotations = assemble_annotations(runtime_visible_annotations,
1970 runtime_visible_annotations_length,
1971 runtime_invisible_annotations,
1972 runtime_invisible_annotations_length,
1973 CHECK_(nullHandle));
1974 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1975 runtime_visible_parameter_annotations_length,
1976 runtime_invisible_parameter_annotations,
1977 runtime_invisible_parameter_annotations_length,
1978 CHECK_(nullHandle));
1979 *method_default_annotations = assemble_annotations(annotation_default,
1980 annotation_default_length,
1981 NULL,
1982 0,
1983 CHECK_(nullHandle));
1985 if (name() == vmSymbols::finalize_method_name() &&
1986 signature() == vmSymbols::void_method_signature()) {
1987 if (m->is_empty_method()) {
1988 _has_empty_finalizer = true;
1989 } else {
1990 _has_finalizer = true;
1991 }
1992 }
1993 if (name() == vmSymbols::object_initializer_name() &&
1994 signature() == vmSymbols::void_method_signature() &&
1995 m->is_vanilla_constructor()) {
1996 _has_vanilla_constructor = true;
1997 }
1999 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2000 m->is_method_handle_adapter())) {
2001 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2002 "Method handle invokers must be defined internally to the VM", nullHandle);
2003 }
2005 return m;
2006 }
2009 // The promoted_flags parameter is used to pass relevant access_flags
2010 // from the methods back up to the containing klass. These flag values
2011 // are added to klass's access_flags.
2013 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2014 AccessFlags* promoted_flags,
2015 bool* has_final_method,
2016 objArrayOop* methods_annotations_oop,
2017 objArrayOop* methods_parameter_annotations_oop,
2018 objArrayOop* methods_default_annotations_oop,
2019 TRAPS) {
2020 ClassFileStream* cfs = stream();
2021 objArrayHandle nullHandle;
2022 typeArrayHandle method_annotations;
2023 typeArrayHandle method_parameter_annotations;
2024 typeArrayHandle method_default_annotations;
2025 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2026 u2 length = cfs->get_u2_fast();
2027 if (length == 0) {
2028 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2029 } else {
2030 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2031 objArrayHandle methods(THREAD, m);
2032 HandleMark hm(THREAD);
2033 objArrayHandle methods_annotations;
2034 objArrayHandle methods_parameter_annotations;
2035 objArrayHandle methods_default_annotations;
2036 for (int index = 0; index < length; index++) {
2037 methodHandle method = parse_method(cp, is_interface,
2038 promoted_flags,
2039 &method_annotations,
2040 &method_parameter_annotations,
2041 &method_default_annotations,
2042 CHECK_(nullHandle));
2043 if (method->is_final()) {
2044 *has_final_method = true;
2045 }
2046 methods->obj_at_put(index, method());
2047 if (method_annotations.not_null()) {
2048 if (methods_annotations.is_null()) {
2049 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2050 methods_annotations = objArrayHandle(THREAD, md);
2051 }
2052 methods_annotations->obj_at_put(index, method_annotations());
2053 }
2054 if (method_parameter_annotations.not_null()) {
2055 if (methods_parameter_annotations.is_null()) {
2056 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2057 methods_parameter_annotations = objArrayHandle(THREAD, md);
2058 }
2059 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2060 }
2061 if (method_default_annotations.not_null()) {
2062 if (methods_default_annotations.is_null()) {
2063 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2064 methods_default_annotations = objArrayHandle(THREAD, md);
2065 }
2066 methods_default_annotations->obj_at_put(index, method_default_annotations());
2067 }
2068 }
2069 if (_need_verify && length > 1) {
2070 // Check duplicated methods
2071 ResourceMark rm(THREAD);
2072 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2073 THREAD, NameSigHash*, HASH_ROW_SIZE);
2074 initialize_hashtable(names_and_sigs);
2075 bool dup = false;
2076 {
2077 debug_only(No_Safepoint_Verifier nsv;)
2078 for (int i = 0; i < length; i++) {
2079 methodOop m = (methodOop)methods->obj_at(i);
2080 // If no duplicates, add name/signature in hashtable names_and_sigs.
2081 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2082 dup = true;
2083 break;
2084 }
2085 }
2086 }
2087 if (dup) {
2088 classfile_parse_error("Duplicate method name&signature in class file %s",
2089 CHECK_(nullHandle));
2090 }
2091 }
2093 *methods_annotations_oop = methods_annotations();
2094 *methods_parameter_annotations_oop = methods_parameter_annotations();
2095 *methods_default_annotations_oop = methods_default_annotations();
2097 return methods;
2098 }
2099 }
2102 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2103 objArrayHandle methods_annotations,
2104 objArrayHandle methods_parameter_annotations,
2105 objArrayHandle methods_default_annotations,
2106 TRAPS) {
2107 typeArrayHandle nullHandle;
2108 int length = methods()->length();
2109 // If JVMTI original method ordering is enabled we have to
2110 // remember the original class file ordering.
2111 // We temporarily use the vtable_index field in the methodOop to store the
2112 // class file index, so we can read in after calling qsort.
2113 if (JvmtiExport::can_maintain_original_method_order()) {
2114 for (int index = 0; index < length; index++) {
2115 methodOop m = methodOop(methods->obj_at(index));
2116 assert(!m->valid_vtable_index(), "vtable index should not be set");
2117 m->set_vtable_index(index);
2118 }
2119 }
2120 // Sort method array by ascending method name (for faster lookups & vtable construction)
2121 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
2122 methodOopDesc::sort_methods(methods(),
2123 methods_annotations(),
2124 methods_parameter_annotations(),
2125 methods_default_annotations());
2127 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2128 if (JvmtiExport::can_maintain_original_method_order()) {
2129 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2130 typeArrayHandle method_ordering(THREAD, new_ordering);
2131 for (int index = 0; index < length; index++) {
2132 methodOop m = methodOop(methods->obj_at(index));
2133 int old_index = m->vtable_index();
2134 assert(old_index >= 0 && old_index < length, "invalid method index");
2135 method_ordering->int_at_put(index, old_index);
2136 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2137 }
2138 return method_ordering;
2139 } else {
2140 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2141 }
2142 }
2145 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2146 ClassFileStream* cfs = stream();
2147 cfs->guarantee_more(2, CHECK); // sourcefile_index
2148 u2 sourcefile_index = cfs->get_u2_fast();
2149 check_property(
2150 valid_cp_range(sourcefile_index, cp->length()) &&
2151 cp->tag_at(sourcefile_index).is_utf8(),
2152 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2153 sourcefile_index, CHECK);
2154 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2155 }
2159 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2160 instanceKlassHandle k,
2161 int length, TRAPS) {
2162 ClassFileStream* cfs = stream();
2163 u1* sde_buffer = cfs->get_u1_buffer();
2164 assert(sde_buffer != NULL, "null sde buffer");
2166 // Don't bother storing it if there is no way to retrieve it
2167 if (JvmtiExport::can_get_source_debug_extension()) {
2168 // Optimistically assume that only 1 byte UTF format is used
2169 // (common case)
2170 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2171 length, CHECK);
2172 k->set_source_debug_extension(sde_symbol);
2173 }
2174 // Got utf8 string, set stream position forward
2175 cfs->skip_u1(length, CHECK);
2176 }
2179 // Inner classes can be static, private or protected (classic VM does this)
2180 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2182 // Return number of classes in the inner classes attribute table
2183 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2184 ClassFileStream* cfs = stream();
2185 cfs->guarantee_more(2, CHECK_0); // length
2186 u2 length = cfs->get_u2_fast();
2188 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2189 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2190 typeArrayHandle inner_classes(THREAD, ic);
2191 int index = 0;
2192 int cp_size = cp->length();
2193 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2194 for (int n = 0; n < length; n++) {
2195 // Inner class index
2196 u2 inner_class_info_index = cfs->get_u2_fast();
2197 check_property(
2198 inner_class_info_index == 0 ||
2199 (valid_cp_range(inner_class_info_index, cp_size) &&
2200 is_klass_reference(cp, inner_class_info_index)),
2201 "inner_class_info_index %u has bad constant type in class file %s",
2202 inner_class_info_index, CHECK_0);
2203 // Outer class index
2204 u2 outer_class_info_index = cfs->get_u2_fast();
2205 check_property(
2206 outer_class_info_index == 0 ||
2207 (valid_cp_range(outer_class_info_index, cp_size) &&
2208 is_klass_reference(cp, outer_class_info_index)),
2209 "outer_class_info_index %u has bad constant type in class file %s",
2210 outer_class_info_index, CHECK_0);
2211 // Inner class name
2212 u2 inner_name_index = cfs->get_u2_fast();
2213 check_property(
2214 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2215 cp->tag_at(inner_name_index).is_utf8()),
2216 "inner_name_index %u has bad constant type in class file %s",
2217 inner_name_index, CHECK_0);
2218 if (_need_verify) {
2219 guarantee_property(inner_class_info_index != outer_class_info_index,
2220 "Class is both outer and inner class in class file %s", CHECK_0);
2221 }
2222 // Access flags
2223 AccessFlags inner_access_flags;
2224 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2225 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2226 // Set abstract bit for old class files for backward compatibility
2227 flags |= JVM_ACC_ABSTRACT;
2228 }
2229 verify_legal_class_modifiers(flags, CHECK_0);
2230 inner_access_flags.set_flags(flags);
2232 inner_classes->short_at_put(index++, inner_class_info_index);
2233 inner_classes->short_at_put(index++, outer_class_info_index);
2234 inner_classes->short_at_put(index++, inner_name_index);
2235 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2236 }
2238 // 4347400: make sure there's no duplicate entry in the classes array
2239 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2240 for(int i = 0; i < inner_classes->length(); i += 4) {
2241 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2242 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2243 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2244 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2245 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2246 "Duplicate entry in InnerClasses in class file %s",
2247 CHECK_0);
2248 }
2249 }
2250 }
2252 // Update instanceKlass with inner class info.
2253 k->set_inner_classes(inner_classes());
2254 return length;
2255 }
2257 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2258 k->set_is_synthetic();
2259 }
2261 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2262 ClassFileStream* cfs = stream();
2263 u2 signature_index = cfs->get_u2(CHECK);
2264 check_property(
2265 valid_cp_range(signature_index, cp->length()) &&
2266 cp->tag_at(signature_index).is_utf8(),
2267 "Invalid constant pool index %u in Signature attribute in class file %s",
2268 signature_index, CHECK);
2269 k->set_generic_signature(cp->symbol_at(signature_index));
2270 }
2272 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2273 ClassFileStream* cfs = stream();
2274 // Set inner classes attribute to default sentinel
2275 k->set_inner_classes(Universe::the_empty_short_array());
2276 cfs->guarantee_more(2, CHECK); // attributes_count
2277 u2 attributes_count = cfs->get_u2_fast();
2278 bool parsed_sourcefile_attribute = false;
2279 bool parsed_innerclasses_attribute = false;
2280 bool parsed_enclosingmethod_attribute = false;
2281 u1* runtime_visible_annotations = NULL;
2282 int runtime_visible_annotations_length = 0;
2283 u1* runtime_invisible_annotations = NULL;
2284 int runtime_invisible_annotations_length = 0;
2285 // Iterate over attributes
2286 while (attributes_count--) {
2287 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2288 u2 attribute_name_index = cfs->get_u2_fast();
2289 u4 attribute_length = cfs->get_u4_fast();
2290 check_property(
2291 valid_cp_range(attribute_name_index, cp->length()) &&
2292 cp->tag_at(attribute_name_index).is_utf8(),
2293 "Attribute name has bad constant pool index %u in class file %s",
2294 attribute_name_index, CHECK);
2295 symbolOop tag = cp->symbol_at(attribute_name_index);
2296 if (tag == vmSymbols::tag_source_file()) {
2297 // Check for SourceFile tag
2298 if (_need_verify) {
2299 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2300 }
2301 if (parsed_sourcefile_attribute) {
2302 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2303 } else {
2304 parsed_sourcefile_attribute = true;
2305 }
2306 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2307 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2308 // Check for SourceDebugExtension tag
2309 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2310 } else if (tag == vmSymbols::tag_inner_classes()) {
2311 // Check for InnerClasses tag
2312 if (parsed_innerclasses_attribute) {
2313 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2314 } else {
2315 parsed_innerclasses_attribute = true;
2316 }
2317 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2318 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2319 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2320 "Wrong InnerClasses attribute length in class file %s", CHECK);
2321 }
2322 } else if (tag == vmSymbols::tag_synthetic()) {
2323 // Check for Synthetic tag
2324 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2325 if (attribute_length != 0) {
2326 classfile_parse_error(
2327 "Invalid Synthetic classfile attribute length %u in class file %s",
2328 attribute_length, CHECK);
2329 }
2330 parse_classfile_synthetic_attribute(cp, k, CHECK);
2331 } else if (tag == vmSymbols::tag_deprecated()) {
2332 // Check for Deprecatd tag - 4276120
2333 if (attribute_length != 0) {
2334 classfile_parse_error(
2335 "Invalid Deprecated classfile attribute length %u in class file %s",
2336 attribute_length, CHECK);
2337 }
2338 } else if (_major_version >= JAVA_1_5_VERSION) {
2339 if (tag == vmSymbols::tag_signature()) {
2340 if (attribute_length != 2) {
2341 classfile_parse_error(
2342 "Wrong Signature attribute length %u in class file %s",
2343 attribute_length, CHECK);
2344 }
2345 parse_classfile_signature_attribute(cp, k, CHECK);
2346 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2347 runtime_visible_annotations_length = attribute_length;
2348 runtime_visible_annotations = cfs->get_u1_buffer();
2349 assert(runtime_visible_annotations != NULL, "null visible annotations");
2350 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2351 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2352 runtime_invisible_annotations_length = attribute_length;
2353 runtime_invisible_annotations = cfs->get_u1_buffer();
2354 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2355 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2356 } else if (tag == vmSymbols::tag_enclosing_method()) {
2357 if (parsed_enclosingmethod_attribute) {
2358 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2359 } else {
2360 parsed_enclosingmethod_attribute = true;
2361 }
2362 cfs->guarantee_more(4, CHECK); // class_index, method_index
2363 u2 class_index = cfs->get_u2_fast();
2364 u2 method_index = cfs->get_u2_fast();
2365 if (class_index == 0) {
2366 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2367 }
2368 // Validate the constant pool indices and types
2369 if (!cp->is_within_bounds(class_index) ||
2370 !is_klass_reference(cp, class_index)) {
2371 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2372 }
2373 if (method_index != 0 &&
2374 (!cp->is_within_bounds(method_index) ||
2375 !cp->tag_at(method_index).is_name_and_type())) {
2376 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2377 }
2378 k->set_enclosing_method_indices(class_index, method_index);
2379 } else {
2380 // Unknown attribute
2381 cfs->skip_u1(attribute_length, CHECK);
2382 }
2383 } else {
2384 // Unknown attribute
2385 cfs->skip_u1(attribute_length, CHECK);
2386 }
2387 }
2388 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2389 runtime_visible_annotations_length,
2390 runtime_invisible_annotations,
2391 runtime_invisible_annotations_length,
2392 CHECK);
2393 k->set_class_annotations(annotations());
2394 }
2397 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2398 int runtime_visible_annotations_length,
2399 u1* runtime_invisible_annotations,
2400 int runtime_invisible_annotations_length, TRAPS) {
2401 typeArrayHandle annotations;
2402 if (runtime_visible_annotations != NULL ||
2403 runtime_invisible_annotations != NULL) {
2404 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2405 runtime_invisible_annotations_length, CHECK_(annotations));
2406 annotations = typeArrayHandle(THREAD, anno);
2407 if (runtime_visible_annotations != NULL) {
2408 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2409 }
2410 if (runtime_invisible_annotations != NULL) {
2411 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2412 }
2413 }
2414 return annotations;
2415 }
2418 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2419 KlassHandle h_k (THREAD, fd->field_holder());
2420 assert(h_k.not_null() && fd->is_static(), "just checking");
2421 if (fd->has_initial_value()) {
2422 BasicType t = fd->field_type();
2423 switch (t) {
2424 case T_BYTE:
2425 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2426 break;
2427 case T_BOOLEAN:
2428 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2429 break;
2430 case T_CHAR:
2431 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2432 break;
2433 case T_SHORT:
2434 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2435 break;
2436 case T_INT:
2437 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2438 break;
2439 case T_FLOAT:
2440 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2441 break;
2442 case T_DOUBLE:
2443 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2444 break;
2445 case T_LONG:
2446 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2447 break;
2448 case T_OBJECT:
2449 {
2450 #ifdef ASSERT
2451 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2452 assert(fd->signature() == sym, "just checking");
2453 #endif
2454 oop string = fd->string_initial_value(CHECK);
2455 h_k()->obj_field_put(fd->offset(), string);
2456 }
2457 break;
2458 default:
2459 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2460 "Illegal ConstantValue attribute in class file");
2461 }
2462 }
2463 }
2466 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2467 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2468 // This code is for compatibility with earlier jdk's that do not
2469 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2470 // the check for the "discovered" field should issue a warning if
2471 // the field is not found. For 1.6 this code should be issue a
2472 // fatal error if the "discovered" field is not found.
2473 //
2474 // Increment fac.nonstatic_oop_count so that the start of the
2475 // next type of non-static oops leaves room for the fake oop.
2476 // Do not increment next_nonstatic_oop_offset so that the
2477 // fake oop is place after the java.lang.ref.Reference oop
2478 // fields.
2479 //
2480 // Check the fields in java.lang.ref.Reference for the "discovered"
2481 // field. If it is not present, artifically create a field for it.
2482 // This allows this VM to run on early JDK where the field is not
2483 // present.
2485 //
2486 // Increment fac.nonstatic_oop_count so that the start of the
2487 // next type of non-static oops leaves room for the fake oop.
2488 // Do not increment next_nonstatic_oop_offset so that the
2489 // fake oop is place after the java.lang.ref.Reference oop
2490 // fields.
2491 //
2492 // Check the fields in java.lang.ref.Reference for the "discovered"
2493 // field. If it is not present, artifically create a field for it.
2494 // This allows this VM to run on early JDK where the field is not
2495 // present.
2496 int reference_sig_index = 0;
2497 int reference_name_index = 0;
2498 int reference_index = 0;
2499 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2500 const int n = (*fields_ptr)()->length();
2501 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2502 int name_index =
2503 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2504 int sig_index =
2505 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2506 symbolOop f_name = cp->symbol_at(name_index);
2507 symbolOop f_sig = cp->symbol_at(sig_index);
2508 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2509 // Save the index for reference signature for later use.
2510 // The fake discovered field does not entries in the
2511 // constant pool so the index for its signature cannot
2512 // be extracted from the constant pool. It will need
2513 // later, however. It's signature is vmSymbols::reference_signature()
2514 // so same an index for that signature.
2515 reference_sig_index = sig_index;
2516 reference_name_index = name_index;
2517 reference_index = i;
2518 }
2519 if (f_name == vmSymbols::reference_discovered_name() &&
2520 f_sig == vmSymbols::reference_signature()) {
2521 // The values below are fake but will force extra
2522 // non-static oop fields and a corresponding non-static
2523 // oop map block to be allocated.
2524 extra = 0;
2525 break;
2526 }
2527 }
2528 if (extra != 0) {
2529 fac_ptr->nonstatic_oop_count += extra;
2530 // Add the additional entry to "fields" so that the klass
2531 // contains the "discoverd" field and the field will be initialized
2532 // in instances of the object.
2533 int fields_with_fix_length = (*fields_ptr)()->length() +
2534 instanceKlass::next_offset;
2535 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2536 fields_with_fix_length, CHECK);
2537 typeArrayHandle fields_with_fix(THREAD, ff);
2539 // Take everything from the original but the length.
2540 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2541 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2542 }
2544 // Add the fake field at the end.
2545 int i = (*fields_ptr)->length();
2546 // There is no name index for the fake "discovered" field nor
2547 // signature but a signature is needed so that the field will
2548 // be properly initialized. Use one found for
2549 // one of the other reference fields. Be sure the index for the
2550 // name is 0. In fieldDescriptor::initialize() the index of the
2551 // name is checked. That check is by passed for the last nonstatic
2552 // oop field in a java.lang.ref.Reference which is assumed to be
2553 // this artificial "discovered" field. An assertion checks that
2554 // the name index is 0.
2555 assert(reference_index != 0, "Missing signature for reference");
2557 int j;
2558 for (j = 0; j < instanceKlass::next_offset; j++) {
2559 fields_with_fix->ushort_at_put(i + j,
2560 (*fields_ptr)->ushort_at(reference_index +j));
2561 }
2562 // Clear the public access flag and set the private access flag.
2563 short flags;
2564 flags =
2565 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2566 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2567 flags = flags & (~JVM_ACC_PUBLIC);
2568 flags = flags | JVM_ACC_PRIVATE;
2569 AccessFlags access_flags;
2570 access_flags.set_flags(flags);
2571 assert(!access_flags.is_public(), "Failed to clear public flag");
2572 assert(access_flags.is_private(), "Failed to set private flag");
2573 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2574 flags);
2576 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2577 == reference_name_index, "The fake reference name is incorrect");
2578 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2579 == reference_sig_index, "The fake reference signature is incorrect");
2580 // The type of the field is stored in the low_offset entry during
2581 // parsing.
2582 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2583 NONSTATIC_OOP, "The fake reference type is incorrect");
2585 // "fields" is allocated in the permanent generation. Disgard
2586 // it and let it be collected.
2587 (*fields_ptr) = fields_with_fix;
2588 }
2589 return;
2590 }
2593 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2594 FieldAllocationCount *fac_ptr, TRAPS) {
2595 // Add fake fields for java.lang.Class instances
2596 //
2597 // This is not particularly nice. We should consider adding a
2598 // private transient object field at the Java level to
2599 // java.lang.Class. Alternatively we could add a subclass of
2600 // instanceKlass which provides an accessor and size computer for
2601 // this field, but that appears to be more code than this hack.
2602 //
2603 // NOTE that we wedge these in at the beginning rather than the
2604 // end of the object because the Class layout changed between JDK
2605 // 1.3 and JDK 1.4 with the new reflection implementation; some
2606 // nonstatic oop fields were added at the Java level. The offsets
2607 // of these fake fields can't change between these two JDK
2608 // versions because when the offsets are computed at bootstrap
2609 // time we don't know yet which version of the JDK we're running in.
2611 // The values below are fake but will force two non-static oop fields and
2612 // a corresponding non-static oop map block to be allocated.
2613 const int extra = java_lang_Class::number_of_fake_oop_fields;
2614 fac_ptr->nonstatic_oop_count += extra;
2615 }
2618 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2619 // Cause the extra fake fields in java.lang.Class to show up before
2620 // the Java fields for layout compatibility between 1.3 and 1.4
2621 // Incrementing next_nonstatic_oop_offset here advances the
2622 // location where the real java fields are placed.
2623 const int extra = java_lang_Class::number_of_fake_oop_fields;
2624 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2625 }
2628 // Force MethodHandle.vmentry to be an unmanaged pointer.
2629 // There is no way for a classfile to express this, so we must help it.
2630 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2631 typeArrayHandle* fields_ptr,
2632 FieldAllocationCount *fac_ptr,
2633 TRAPS) {
2634 // Add fake fields for java.dyn.MethodHandle instances
2635 //
2636 // This is not particularly nice, but since there is no way to express
2637 // a native wordSize field in Java, we must do it at this level.
2639 if (!EnableMethodHandles) return;
2641 int word_sig_index = 0;
2642 const int cp_size = cp->length();
2643 for (int index = 1; index < cp_size; index++) {
2644 if (cp->tag_at(index).is_utf8() &&
2645 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2646 word_sig_index = index;
2647 break;
2648 }
2649 }
2651 if (word_sig_index == 0)
2652 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2653 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2655 bool found_vmentry = false;
2657 const int n = (*fields_ptr)()->length();
2658 for (int i = 0; i < n; i += instanceKlass::next_offset) {
2659 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2660 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2661 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2662 symbolOop f_name = cp->symbol_at(name_index);
2663 symbolOop f_sig = cp->symbol_at(sig_index);
2664 if (f_sig == vmSymbols::byte_signature() &&
2665 f_name == vmSymbols::vmentry_name() &&
2666 (acc_flags & JVM_ACC_STATIC) == 0) {
2667 // Adjust the field type from byte to an unmanaged pointer.
2668 assert(fac_ptr->nonstatic_byte_count > 0, "");
2669 fac_ptr->nonstatic_byte_count -= 1;
2670 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
2671 word_sig_index);
2672 fac_ptr->nonstatic_word_count += 1;
2674 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2675 assert(atype == NONSTATIC_BYTE, "");
2676 FieldAllocationType new_atype = NONSTATIC_WORD;
2677 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2679 found_vmentry = true;
2680 break;
2681 }
2682 }
2684 if (!found_vmentry)
2685 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2686 "missing vmentry byte field in java.dyn.MethodHandle");
2688 }
2691 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2692 Handle class_loader,
2693 Handle protection_domain,
2694 KlassHandle host_klass,
2695 GrowableArray<Handle>* cp_patches,
2696 symbolHandle& parsed_name,
2697 bool verify,
2698 TRAPS) {
2699 // So that JVMTI can cache class file in the state before retransformable agents
2700 // have modified it
2701 unsigned char *cached_class_file_bytes = NULL;
2702 jint cached_class_file_length;
2704 ClassFileStream* cfs = stream();
2705 // Timing
2706 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2707 JavaThread* jt = (JavaThread*) THREAD;
2709 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2710 ClassLoader::perf_class_parse_selftime(),
2711 NULL,
2712 jt->get_thread_stat()->perf_recursion_counts_addr(),
2713 jt->get_thread_stat()->perf_timers_addr(),
2714 PerfClassTraceTime::PARSE_CLASS);
2716 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2718 if (JvmtiExport::should_post_class_file_load_hook()) {
2719 unsigned char* ptr = cfs->buffer();
2720 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2722 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2723 &ptr, &end_ptr,
2724 &cached_class_file_bytes,
2725 &cached_class_file_length);
2727 if (ptr != cfs->buffer()) {
2728 // JVMTI agent has modified class file data.
2729 // Set new class file stream using JVMTI agent modified
2730 // class file data.
2731 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2732 set_stream(cfs);
2733 }
2734 }
2736 _host_klass = host_klass;
2737 _cp_patches = cp_patches;
2739 instanceKlassHandle nullHandle;
2741 // Figure out whether we can skip format checking (matching classic VM behavior)
2742 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2744 // Set the verify flag in stream
2745 cfs->set_verify(_need_verify);
2747 // Save the class file name for easier error message printing.
2748 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2750 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2751 // Magic value
2752 u4 magic = cfs->get_u4_fast();
2753 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2754 "Incompatible magic value %u in class file %s",
2755 magic, CHECK_(nullHandle));
2757 // Version numbers
2758 u2 minor_version = cfs->get_u2_fast();
2759 u2 major_version = cfs->get_u2_fast();
2761 // Check version numbers - we check this even with verifier off
2762 if (!is_supported_version(major_version, minor_version)) {
2763 if (name.is_null()) {
2764 Exceptions::fthrow(
2765 THREAD_AND_LOCATION,
2766 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2767 "Unsupported major.minor version %u.%u",
2768 major_version,
2769 minor_version);
2770 } else {
2771 ResourceMark rm(THREAD);
2772 Exceptions::fthrow(
2773 THREAD_AND_LOCATION,
2774 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2775 "%s : Unsupported major.minor version %u.%u",
2776 name->as_C_string(),
2777 major_version,
2778 minor_version);
2779 }
2780 return nullHandle;
2781 }
2783 _major_version = major_version;
2784 _minor_version = minor_version;
2787 // Check if verification needs to be relaxed for this class file
2788 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2789 _relax_verify = Verifier::relax_verify_for(class_loader());
2791 // Constant pool
2792 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2793 int cp_size = cp->length();
2795 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2797 // Access flags
2798 AccessFlags access_flags;
2799 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2801 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2802 // Set abstract bit for old class files for backward compatibility
2803 flags |= JVM_ACC_ABSTRACT;
2804 }
2805 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2806 access_flags.set_flags(flags);
2808 // This class and superclass
2809 instanceKlassHandle super_klass;
2810 u2 this_class_index = cfs->get_u2_fast();
2811 check_property(
2812 valid_cp_range(this_class_index, cp_size) &&
2813 cp->tag_at(this_class_index).is_unresolved_klass(),
2814 "Invalid this class index %u in constant pool in class file %s",
2815 this_class_index, CHECK_(nullHandle));
2817 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2818 assert(class_name.not_null(), "class_name can't be null");
2820 // It's important to set parsed_name *before* resolving the super class.
2821 // (it's used for cleanup by the caller if parsing fails)
2822 parsed_name = class_name;
2824 // Update _class_name which could be null previously to be class_name
2825 _class_name = class_name;
2827 // Don't need to check whether this class name is legal or not.
2828 // It has been checked when constant pool is parsed.
2829 // However, make sure it is not an array type.
2830 if (_need_verify) {
2831 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2832 "Bad class name in class file %s",
2833 CHECK_(nullHandle));
2834 }
2836 klassOop preserve_this_klass; // for storing result across HandleMark
2838 // release all handles when parsing is done
2839 { HandleMark hm(THREAD);
2841 // Checks if name in class file matches requested name
2842 if (name.not_null() && class_name() != name()) {
2843 ResourceMark rm(THREAD);
2844 Exceptions::fthrow(
2845 THREAD_AND_LOCATION,
2846 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2847 "%s (wrong name: %s)",
2848 name->as_C_string(),
2849 class_name->as_C_string()
2850 );
2851 return nullHandle;
2852 }
2854 if (TraceClassLoadingPreorder) {
2855 tty->print("[Loading %s", name()->as_klass_external_name());
2856 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2857 tty->print_cr("]");
2858 }
2860 u2 super_class_index = cfs->get_u2_fast();
2861 if (super_class_index == 0) {
2862 check_property(class_name() == vmSymbols::java_lang_Object(),
2863 "Invalid superclass index %u in class file %s",
2864 super_class_index,
2865 CHECK_(nullHandle));
2866 } else {
2867 check_property(valid_cp_range(super_class_index, cp_size) &&
2868 is_klass_reference(cp, super_class_index),
2869 "Invalid superclass index %u in class file %s",
2870 super_class_index,
2871 CHECK_(nullHandle));
2872 // The class name should be legal because it is checked when parsing constant pool.
2873 // However, make sure it is not an array type.
2874 bool is_array = false;
2875 if (cp->tag_at(super_class_index).is_klass()) {
2876 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2877 if (_need_verify)
2878 is_array = super_klass->oop_is_array();
2879 } else if (_need_verify) {
2880 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2881 }
2882 if (_need_verify) {
2883 guarantee_property(!is_array,
2884 "Bad superclass name in class file %s", CHECK_(nullHandle));
2885 }
2886 }
2888 // Interfaces
2889 u2 itfs_len = cfs->get_u2_fast();
2890 objArrayHandle local_interfaces;
2891 if (itfs_len == 0) {
2892 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2893 } else {
2894 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2895 }
2897 // Fields (offsets are filled in later)
2898 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2899 objArrayHandle fields_annotations;
2900 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2901 // Methods
2902 bool has_final_method = false;
2903 AccessFlags promoted_flags;
2904 promoted_flags.set_flags(0);
2905 // These need to be oop pointers because they are allocated lazily
2906 // inside parse_methods inside a nested HandleMark
2907 objArrayOop methods_annotations_oop = NULL;
2908 objArrayOop methods_parameter_annotations_oop = NULL;
2909 objArrayOop methods_default_annotations_oop = NULL;
2910 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2911 &promoted_flags,
2912 &has_final_method,
2913 &methods_annotations_oop,
2914 &methods_parameter_annotations_oop,
2915 &methods_default_annotations_oop,
2916 CHECK_(nullHandle));
2918 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2919 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2920 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2922 // We check super class after class file is parsed and format is checked
2923 if (super_class_index > 0 && super_klass.is_null()) {
2924 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2925 if (access_flags.is_interface()) {
2926 // Before attempting to resolve the superclass, check for class format
2927 // errors not checked yet.
2928 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2929 "Interfaces must have java.lang.Object as superclass in class file %s",
2930 CHECK_(nullHandle));
2931 }
2932 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2933 sk,
2934 class_loader,
2935 protection_domain,
2936 true,
2937 CHECK_(nullHandle));
2939 KlassHandle kh (THREAD, k);
2940 super_klass = instanceKlassHandle(THREAD, kh());
2941 if (LinkWellKnownClasses) // my super class is well known to me
2942 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2943 }
2944 if (super_klass.not_null()) {
2945 if (super_klass->is_interface()) {
2946 ResourceMark rm(THREAD);
2947 Exceptions::fthrow(
2948 THREAD_AND_LOCATION,
2949 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2950 "class %s has interface %s as super class",
2951 class_name->as_klass_external_name(),
2952 super_klass->external_name()
2953 );
2954 return nullHandle;
2955 }
2956 // Make sure super class is not final
2957 if (super_klass->is_final()) {
2958 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2959 }
2960 }
2962 // Compute the transitive list of all unique interfaces implemented by this class
2963 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2965 // sort methods
2966 typeArrayHandle method_ordering = sort_methods(methods,
2967 methods_annotations,
2968 methods_parameter_annotations,
2969 methods_default_annotations,
2970 CHECK_(nullHandle));
2972 // promote flags from parse_methods() to the klass' flags
2973 access_flags.add_promoted_flags(promoted_flags.as_int());
2975 // Size of Java vtable (in words)
2976 int vtable_size = 0;
2977 int itable_size = 0;
2978 int num_miranda_methods = 0;
2980 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2981 num_miranda_methods,
2982 super_klass(),
2983 methods(),
2984 access_flags,
2985 class_loader,
2986 class_name,
2987 local_interfaces(),
2988 CHECK_(nullHandle));
2990 // Size of Java itable (in words)
2991 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2993 // Field size and offset computation
2994 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2995 #ifndef PRODUCT
2996 int orig_nonstatic_field_size = 0;
2997 #endif
2998 int static_field_size = 0;
2999 int next_static_oop_offset;
3000 int next_static_double_offset;
3001 int next_static_word_offset;
3002 int next_static_short_offset;
3003 int next_static_byte_offset;
3004 int next_static_type_offset;
3005 int next_nonstatic_oop_offset;
3006 int next_nonstatic_double_offset;
3007 int next_nonstatic_word_offset;
3008 int next_nonstatic_short_offset;
3009 int next_nonstatic_byte_offset;
3010 int next_nonstatic_type_offset;
3011 int first_nonstatic_oop_offset;
3012 int first_nonstatic_field_offset;
3013 int next_nonstatic_field_offset;
3015 // Calculate the starting byte offsets
3016 next_static_oop_offset = (instanceKlass::header_size() +
3017 align_object_offset(vtable_size) +
3018 align_object_offset(itable_size)) * wordSize;
3019 next_static_double_offset = next_static_oop_offset +
3020 (fac.static_oop_count * heapOopSize);
3021 if ( fac.static_double_count &&
3022 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3023 Universe::field_type_should_be_aligned(T_LONG)) ) {
3024 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3025 }
3027 next_static_word_offset = next_static_double_offset +
3028 (fac.static_double_count * BytesPerLong);
3029 next_static_short_offset = next_static_word_offset +
3030 (fac.static_word_count * BytesPerInt);
3031 next_static_byte_offset = next_static_short_offset +
3032 (fac.static_short_count * BytesPerShort);
3033 next_static_type_offset = align_size_up((next_static_byte_offset +
3034 fac.static_byte_count ), wordSize );
3035 static_field_size = (next_static_type_offset -
3036 next_static_oop_offset) / wordSize;
3037 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3038 nonstatic_field_size * heapOopSize;
3039 next_nonstatic_field_offset = first_nonstatic_field_offset;
3041 // Add fake fields for java.lang.Class instances (also see below)
3042 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3043 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3044 }
3046 // adjust the vmentry field declaration in java.dyn.MethodHandle
3047 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3048 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
3049 }
3051 // Add a fake "discovered" field if it is not present
3052 // for compatibility with earlier jdk's.
3053 if (class_name() == vmSymbols::java_lang_ref_Reference()
3054 && class_loader.is_null()) {
3055 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3056 }
3057 // end of "discovered" field compactibility fix
3059 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3060 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3061 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3062 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3063 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3065 bool super_has_nonstatic_fields =
3066 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3067 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3068 ((nonstatic_double_count + nonstatic_word_count +
3069 nonstatic_short_count + nonstatic_byte_count +
3070 nonstatic_oop_count) != 0);
3073 // Prepare list of oops for oop map generation.
3074 int* nonstatic_oop_offsets;
3075 unsigned int* nonstatic_oop_counts;
3076 unsigned int nonstatic_oop_map_count = 0;
3078 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3079 THREAD, int, nonstatic_oop_count + 1);
3080 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3081 THREAD, unsigned int, nonstatic_oop_count + 1);
3083 // Add fake fields for java.lang.Class instances (also see above).
3084 // FieldsAllocationStyle and CompactFields values will be reset to default.
3085 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3086 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3087 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3088 const uint fake_oop_count = (next_nonstatic_field_offset -
3089 first_nonstatic_field_offset) / heapOopSize;
3090 nonstatic_oop_counts[0] = fake_oop_count;
3091 nonstatic_oop_map_count = 1;
3092 nonstatic_oop_count -= fake_oop_count;
3093 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3094 } else {
3095 first_nonstatic_oop_offset = 0; // will be set for first oop field
3096 }
3098 #ifndef PRODUCT
3099 if( PrintCompactFieldsSavings ) {
3100 next_nonstatic_double_offset = next_nonstatic_field_offset +
3101 (nonstatic_oop_count * heapOopSize);
3102 if ( nonstatic_double_count > 0 ) {
3103 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3104 }
3105 next_nonstatic_word_offset = next_nonstatic_double_offset +
3106 (nonstatic_double_count * BytesPerLong);
3107 next_nonstatic_short_offset = next_nonstatic_word_offset +
3108 (nonstatic_word_count * BytesPerInt);
3109 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3110 (nonstatic_short_count * BytesPerShort);
3111 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3112 nonstatic_byte_count ), heapOopSize );
3113 orig_nonstatic_field_size = nonstatic_field_size +
3114 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3115 }
3116 #endif
3117 bool compact_fields = CompactFields;
3118 int allocation_style = FieldsAllocationStyle;
3119 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3120 assert(false, "0 <= FieldsAllocationStyle <= 2");
3121 allocation_style = 1; // Optimistic
3122 }
3124 // The next classes have predefined hard-coded fields offsets
3125 // (see in JavaClasses::compute_hard_coded_offsets()).
3126 // Use default fields allocation order for them.
3127 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3128 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
3129 class_name() == vmSymbols::java_lang_Class() ||
3130 class_name() == vmSymbols::java_lang_ClassLoader() ||
3131 class_name() == vmSymbols::java_lang_ref_Reference() ||
3132 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
3133 class_name() == vmSymbols::java_lang_StackTraceElement() ||
3134 class_name() == vmSymbols::java_lang_String() ||
3135 class_name() == vmSymbols::java_lang_Throwable() ||
3136 class_name() == vmSymbols::java_lang_Boolean() ||
3137 class_name() == vmSymbols::java_lang_Character() ||
3138 class_name() == vmSymbols::java_lang_Float() ||
3139 class_name() == vmSymbols::java_lang_Double() ||
3140 class_name() == vmSymbols::java_lang_Byte() ||
3141 class_name() == vmSymbols::java_lang_Short() ||
3142 class_name() == vmSymbols::java_lang_Integer() ||
3143 class_name() == vmSymbols::java_lang_Long())) {
3144 allocation_style = 0; // Allocate oops first
3145 compact_fields = false; // Don't compact fields
3146 }
3148 if( allocation_style == 0 ) {
3149 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3150 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3151 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3152 (nonstatic_oop_count * heapOopSize);
3153 } else if( allocation_style == 1 ) {
3154 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3155 next_nonstatic_double_offset = next_nonstatic_field_offset;
3156 } else if( allocation_style == 2 ) {
3157 // Fields allocation: oops fields in super and sub classes are together.
3158 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3159 super_klass->nonstatic_oop_map_size() > 0 ) {
3160 int map_size = super_klass->nonstatic_oop_map_size();
3161 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3162 OopMapBlock* last_map = first_map + map_size - 1;
3163 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3164 if (next_offset == next_nonstatic_field_offset) {
3165 allocation_style = 0; // allocate oops first
3166 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3167 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3168 (nonstatic_oop_count * heapOopSize);
3169 }
3170 }
3171 if( allocation_style == 2 ) {
3172 allocation_style = 1; // allocate oops last
3173 next_nonstatic_double_offset = next_nonstatic_field_offset;
3174 }
3175 } else {
3176 ShouldNotReachHere();
3177 }
3179 int nonstatic_oop_space_count = 0;
3180 int nonstatic_word_space_count = 0;
3181 int nonstatic_short_space_count = 0;
3182 int nonstatic_byte_space_count = 0;
3183 int nonstatic_oop_space_offset;
3184 int nonstatic_word_space_offset;
3185 int nonstatic_short_space_offset;
3186 int nonstatic_byte_space_offset;
3188 if( nonstatic_double_count > 0 ) {
3189 int offset = next_nonstatic_double_offset;
3190 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3191 if( compact_fields && offset != next_nonstatic_double_offset ) {
3192 // Allocate available fields into the gap before double field.
3193 int length = next_nonstatic_double_offset - offset;
3194 assert(length == BytesPerInt, "");
3195 nonstatic_word_space_offset = offset;
3196 if( nonstatic_word_count > 0 ) {
3197 nonstatic_word_count -= 1;
3198 nonstatic_word_space_count = 1; // Only one will fit
3199 length -= BytesPerInt;
3200 offset += BytesPerInt;
3201 }
3202 nonstatic_short_space_offset = offset;
3203 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3204 nonstatic_short_count -= 1;
3205 nonstatic_short_space_count += 1;
3206 length -= BytesPerShort;
3207 offset += BytesPerShort;
3208 }
3209 nonstatic_byte_space_offset = offset;
3210 while( length > 0 && nonstatic_byte_count > 0 ) {
3211 nonstatic_byte_count -= 1;
3212 nonstatic_byte_space_count += 1;
3213 length -= 1;
3214 }
3215 // Allocate oop field in the gap if there are no other fields for that.
3216 nonstatic_oop_space_offset = offset;
3217 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3218 allocation_style != 0 ) { // when oop fields not first
3219 nonstatic_oop_count -= 1;
3220 nonstatic_oop_space_count = 1; // Only one will fit
3221 length -= heapOopSize;
3222 offset += heapOopSize;
3223 }
3224 }
3225 }
3227 next_nonstatic_word_offset = next_nonstatic_double_offset +
3228 (nonstatic_double_count * BytesPerLong);
3229 next_nonstatic_short_offset = next_nonstatic_word_offset +
3230 (nonstatic_word_count * BytesPerInt);
3231 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3232 (nonstatic_short_count * BytesPerShort);
3234 int notaligned_offset;
3235 if( allocation_style == 0 ) {
3236 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3237 } else { // allocation_style == 1
3238 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3239 if( nonstatic_oop_count > 0 ) {
3240 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3241 }
3242 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3243 }
3244 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3245 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3246 - first_nonstatic_field_offset)/heapOopSize);
3248 // Iterate over fields again and compute correct offsets.
3249 // The field allocation type was temporarily stored in the offset slot.
3250 // oop fields are located before non-oop fields (static and non-static).
3251 int len = fields->length();
3252 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3253 int real_offset;
3254 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3255 switch (atype) {
3256 case STATIC_OOP:
3257 real_offset = next_static_oop_offset;
3258 next_static_oop_offset += heapOopSize;
3259 break;
3260 case STATIC_BYTE:
3261 real_offset = next_static_byte_offset;
3262 next_static_byte_offset += 1;
3263 break;
3264 case STATIC_SHORT:
3265 real_offset = next_static_short_offset;
3266 next_static_short_offset += BytesPerShort;
3267 break;
3268 case STATIC_WORD:
3269 real_offset = next_static_word_offset;
3270 next_static_word_offset += BytesPerInt;
3271 break;
3272 case STATIC_ALIGNED_DOUBLE:
3273 case STATIC_DOUBLE:
3274 real_offset = next_static_double_offset;
3275 next_static_double_offset += BytesPerLong;
3276 break;
3277 case NONSTATIC_OOP:
3278 if( nonstatic_oop_space_count > 0 ) {
3279 real_offset = nonstatic_oop_space_offset;
3280 nonstatic_oop_space_offset += heapOopSize;
3281 nonstatic_oop_space_count -= 1;
3282 } else {
3283 real_offset = next_nonstatic_oop_offset;
3284 next_nonstatic_oop_offset += heapOopSize;
3285 }
3286 // Update oop maps
3287 if( nonstatic_oop_map_count > 0 &&
3288 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3289 real_offset -
3290 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3291 heapOopSize ) {
3292 // Extend current oop map
3293 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3294 } else {
3295 // Create new oop map
3296 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3297 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3298 nonstatic_oop_map_count += 1;
3299 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3300 first_nonstatic_oop_offset = real_offset;
3301 }
3302 }
3303 break;
3304 case NONSTATIC_BYTE:
3305 if( nonstatic_byte_space_count > 0 ) {
3306 real_offset = nonstatic_byte_space_offset;
3307 nonstatic_byte_space_offset += 1;
3308 nonstatic_byte_space_count -= 1;
3309 } else {
3310 real_offset = next_nonstatic_byte_offset;
3311 next_nonstatic_byte_offset += 1;
3312 }
3313 break;
3314 case NONSTATIC_SHORT:
3315 if( nonstatic_short_space_count > 0 ) {
3316 real_offset = nonstatic_short_space_offset;
3317 nonstatic_short_space_offset += BytesPerShort;
3318 nonstatic_short_space_count -= 1;
3319 } else {
3320 real_offset = next_nonstatic_short_offset;
3321 next_nonstatic_short_offset += BytesPerShort;
3322 }
3323 break;
3324 case NONSTATIC_WORD:
3325 if( nonstatic_word_space_count > 0 ) {
3326 real_offset = nonstatic_word_space_offset;
3327 nonstatic_word_space_offset += BytesPerInt;
3328 nonstatic_word_space_count -= 1;
3329 } else {
3330 real_offset = next_nonstatic_word_offset;
3331 next_nonstatic_word_offset += BytesPerInt;
3332 }
3333 break;
3334 case NONSTATIC_ALIGNED_DOUBLE:
3335 case NONSTATIC_DOUBLE:
3336 real_offset = next_nonstatic_double_offset;
3337 next_nonstatic_double_offset += BytesPerLong;
3338 break;
3339 default:
3340 ShouldNotReachHere();
3341 }
3342 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3343 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3344 }
3346 // Size of instances
3347 int instance_size;
3349 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3350 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3352 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3354 // Number of non-static oop map blocks allocated at end of klass.
3355 const unsigned int total_oop_map_count =
3356 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3357 first_nonstatic_oop_offset);
3359 // Compute reference type
3360 ReferenceType rt;
3361 if (super_klass() == NULL) {
3362 rt = REF_NONE;
3363 } else {
3364 rt = super_klass->reference_type();
3365 }
3367 // We can now create the basic klassOop for this klass
3368 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3369 static_field_size,
3370 total_oop_map_count,
3371 rt, CHECK_(nullHandle));
3372 instanceKlassHandle this_klass (THREAD, ik);
3374 assert(this_klass->static_field_size() == static_field_size, "sanity");
3375 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3376 "sanity");
3378 // Fill in information already parsed
3379 this_klass->set_access_flags(access_flags);
3380 this_klass->set_should_verify_class(verify);
3381 jint lh = Klass::instance_layout_helper(instance_size, false);
3382 this_klass->set_layout_helper(lh);
3383 assert(this_klass->oop_is_instance(), "layout is correct");
3384 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3385 // Not yet: supers are done below to support the new subtype-checking fields
3386 //this_klass->set_super(super_klass());
3387 this_klass->set_class_loader(class_loader());
3388 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3389 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3390 this_klass->set_static_oop_field_size(fac.static_oop_count);
3391 cp->set_pool_holder(this_klass());
3392 this_klass->set_constants(cp());
3393 this_klass->set_local_interfaces(local_interfaces());
3394 this_klass->set_fields(fields());
3395 this_klass->set_methods(methods());
3396 if (has_final_method) {
3397 this_klass->set_has_final_method();
3398 }
3399 this_klass->set_method_ordering(method_ordering());
3400 // The instanceKlass::_methods_jmethod_ids cache and the
3401 // instanceKlass::_methods_cached_itable_indices cache are
3402 // both managed on the assumption that the initial cache
3403 // size is equal to the number of methods in the class. If
3404 // that changes, then instanceKlass::idnum_can_increment()
3405 // has to be changed accordingly.
3406 this_klass->set_initial_method_idnum(methods->length());
3407 this_klass->set_name(cp->klass_name_at(this_class_index));
3408 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3409 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3410 this_klass->set_protection_domain(protection_domain());
3411 this_klass->set_fields_annotations(fields_annotations());
3412 this_klass->set_methods_annotations(methods_annotations());
3413 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3414 this_klass->set_methods_default_annotations(methods_default_annotations());
3416 this_klass->set_minor_version(minor_version);
3417 this_klass->set_major_version(major_version);
3419 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3420 // (We used to do this lazily, but now we query it in Rewriter,
3421 // which is eagerly done for every method, so we might as well do it now,
3422 // when everything is fresh in memory.)
3423 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3424 for (int j = 0; j < methods->length(); j++) {
3425 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3426 }
3427 }
3429 if (cached_class_file_bytes != NULL) {
3430 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3431 this_klass->set_cached_class_file(cached_class_file_bytes,
3432 cached_class_file_length);
3433 }
3435 // Miranda methods
3436 if ((num_miranda_methods > 0) ||
3437 // if this class introduced new miranda methods or
3438 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3439 // super class exists and this class inherited miranda methods
3440 ) {
3441 this_klass->set_has_miranda_methods(); // then set a flag
3442 }
3444 // Additional attributes
3445 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3447 // Make sure this is the end of class file stream
3448 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3450 // Initialize static fields
3451 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3453 // VerifyOops believes that once this has been set, the object is completely loaded.
3454 // Compute transitive closure of interfaces this class implements
3455 this_klass->set_transitive_interfaces(transitive_interfaces());
3457 // Fill in information needed to compute superclasses.
3458 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3460 // Initialize itable offset tables
3461 klassItable::setup_itable_offset_table(this_klass);
3463 // Do final class setup
3464 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3466 set_precomputed_flags(this_klass);
3468 // reinitialize modifiers, using the InnerClasses attribute
3469 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3470 this_klass->set_modifier_flags(computed_modifiers);
3472 // check if this class can access its super class
3473 check_super_class_access(this_klass, CHECK_(nullHandle));
3475 // check if this class can access its superinterfaces
3476 check_super_interface_access(this_klass, CHECK_(nullHandle));
3478 // check if this class overrides any final method
3479 check_final_method_override(this_klass, CHECK_(nullHandle));
3481 // check that if this class is an interface then it doesn't have static methods
3482 if (this_klass->is_interface()) {
3483 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3484 }
3486 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3487 false /* not shared class */);
3489 if (TraceClassLoading) {
3490 // print in a single call to reduce interleaving of output
3491 if (cfs->source() != NULL) {
3492 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3493 cfs->source());
3494 } else if (class_loader.is_null()) {
3495 if (THREAD->is_Java_thread()) {
3496 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3497 tty->print("[Loaded %s by instance of %s]\n",
3498 this_klass->external_name(),
3499 instanceKlass::cast(caller)->external_name());
3500 } else {
3501 tty->print("[Loaded %s]\n", this_klass->external_name());
3502 }
3503 } else {
3504 ResourceMark rm;
3505 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3506 instanceKlass::cast(class_loader->klass())->external_name());
3507 }
3508 }
3510 if (TraceClassResolution) {
3511 // print out the superclass.
3512 const char * from = Klass::cast(this_klass())->external_name();
3513 if (this_klass->java_super() != NULL) {
3514 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3515 }
3516 // print out each of the interface classes referred to by this class.
3517 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3518 if (!local_interfaces.is_null()) {
3519 int length = local_interfaces->length();
3520 for (int i = 0; i < length; i++) {
3521 klassOop k = klassOop(local_interfaces->obj_at(i));
3522 instanceKlass* to_class = instanceKlass::cast(k);
3523 const char * to = to_class->external_name();
3524 tty->print("RESOLVE %s %s (interface)\n", from, to);
3525 }
3526 }
3527 }
3529 #ifndef PRODUCT
3530 if( PrintCompactFieldsSavings ) {
3531 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3532 tty->print("[Saved %d of %d bytes in %s]\n",
3533 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3534 orig_nonstatic_field_size*heapOopSize,
3535 this_klass->external_name());
3536 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3537 tty->print("[Wasted %d over %d bytes in %s]\n",
3538 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3539 orig_nonstatic_field_size*heapOopSize,
3540 this_klass->external_name());
3541 }
3542 }
3543 #endif
3545 // preserve result across HandleMark
3546 preserve_this_klass = this_klass();
3547 }
3549 // Create new handle outside HandleMark
3550 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3551 debug_only(this_klass->as_klassOop()->verify();)
3553 return this_klass;
3554 }
3557 unsigned int
3558 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3559 unsigned int nonstatic_oop_map_count,
3560 int first_nonstatic_oop_offset) {
3561 unsigned int map_count =
3562 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3563 if (nonstatic_oop_map_count > 0) {
3564 // We have oops to add to map
3565 if (map_count == 0) {
3566 map_count = nonstatic_oop_map_count;
3567 } else {
3568 // Check whether we should add a new map block or whether the last one can
3569 // be extended
3570 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3571 OopMapBlock* const last_map = first_map + map_count - 1;
3573 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3574 if (next_offset == first_nonstatic_oop_offset) {
3575 // There is no gap bettwen superklass's last oop field and first
3576 // local oop field, merge maps.
3577 nonstatic_oop_map_count -= 1;
3578 } else {
3579 // Superklass didn't end with a oop field, add extra maps
3580 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3581 }
3582 map_count += nonstatic_oop_map_count;
3583 }
3584 }
3585 return map_count;
3586 }
3589 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3590 unsigned int nonstatic_oop_map_count,
3591 int* nonstatic_oop_offsets,
3592 unsigned int* nonstatic_oop_counts) {
3593 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3594 const instanceKlass* const super = k->superklass();
3595 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3596 if (super_count > 0) {
3597 // Copy maps from superklass
3598 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3599 for (unsigned int i = 0; i < super_count; ++i) {
3600 *this_oop_map++ = *super_oop_map++;
3601 }
3602 }
3604 if (nonstatic_oop_map_count > 0) {
3605 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3606 // The counts differ because there is no gap between superklass's last oop
3607 // field and the first local oop field. Extend the last oop map copied
3608 // from the superklass instead of creating new one.
3609 nonstatic_oop_map_count--;
3610 nonstatic_oop_offsets++;
3611 this_oop_map--;
3612 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3613 this_oop_map++;
3614 }
3616 // Add new map blocks, fill them
3617 while (nonstatic_oop_map_count-- > 0) {
3618 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3619 this_oop_map->set_count(*nonstatic_oop_counts++);
3620 this_oop_map++;
3621 }
3622 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3623 this_oop_map, "sanity");
3624 }
3625 }
3628 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3629 klassOop super = k->super();
3631 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3632 // in which case we don't have to register objects as finalizable
3633 if (!_has_empty_finalizer) {
3634 if (_has_finalizer ||
3635 (super != NULL && super->klass_part()->has_finalizer())) {
3636 k->set_has_finalizer();
3637 }
3638 }
3640 #ifdef ASSERT
3641 bool f = false;
3642 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3643 vmSymbols::void_method_signature());
3644 if (m != NULL && !m->is_empty_method()) {
3645 f = true;
3646 }
3647 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3648 #endif
3650 // Check if this klass supports the java.lang.Cloneable interface
3651 if (SystemDictionary::Cloneable_klass_loaded()) {
3652 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3653 k->set_is_cloneable();
3654 }
3655 }
3657 // Check if this klass has a vanilla default constructor
3658 if (super == NULL) {
3659 // java.lang.Object has empty default constructor
3660 k->set_has_vanilla_constructor();
3661 } else {
3662 if (Klass::cast(super)->has_vanilla_constructor() &&
3663 _has_vanilla_constructor) {
3664 k->set_has_vanilla_constructor();
3665 }
3666 #ifdef ASSERT
3667 bool v = false;
3668 if (Klass::cast(super)->has_vanilla_constructor()) {
3669 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3670 ), vmSymbols::void_method_signature());
3671 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3672 v = true;
3673 }
3674 }
3675 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3676 #endif
3677 }
3679 // If it cannot be fast-path allocated, set a bit in the layout helper.
3680 // See documentation of instanceKlass::can_be_fastpath_allocated().
3681 assert(k->size_helper() > 0, "layout_helper is initialized");
3682 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3683 || k->is_abstract() || k->is_interface()
3684 || (k->name() == vmSymbols::java_lang_Class()
3685 && k->class_loader() == NULL)
3686 || k->size_helper() >= FastAllocateSizeLimit) {
3687 // Forbid fast-path allocation.
3688 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3689 k->set_layout_helper(lh);
3690 }
3691 }
3694 // utility method for appending and array with check for duplicates
3696 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3697 // iterate over new interfaces
3698 for (int i = 0; i < ifs->length(); i++) {
3699 oop e = ifs->obj_at(i);
3700 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3701 // check for duplicates
3702 bool duplicate = false;
3703 for (int j = 0; j < index; j++) {
3704 if (result->obj_at(j) == e) {
3705 duplicate = true;
3706 break;
3707 }
3708 }
3709 // add new interface
3710 if (!duplicate) {
3711 result->obj_at_put(index++, e);
3712 }
3713 }
3714 }
3716 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3717 // Compute maximum size for transitive interfaces
3718 int max_transitive_size = 0;
3719 int super_size = 0;
3720 // Add superclass transitive interfaces size
3721 if (super.not_null()) {
3722 super_size = super->transitive_interfaces()->length();
3723 max_transitive_size += super_size;
3724 }
3725 // Add local interfaces' super interfaces
3726 int local_size = local_ifs->length();
3727 for (int i = 0; i < local_size; i++) {
3728 klassOop l = klassOop(local_ifs->obj_at(i));
3729 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3730 }
3731 // Finally add local interfaces
3732 max_transitive_size += local_size;
3733 // Construct array
3734 objArrayHandle result;
3735 if (max_transitive_size == 0) {
3736 // no interfaces, use canonicalized array
3737 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3738 } else if (max_transitive_size == super_size) {
3739 // no new local interfaces added, share superklass' transitive interface array
3740 result = objArrayHandle(THREAD, super->transitive_interfaces());
3741 } else if (max_transitive_size == local_size) {
3742 // only local interfaces added, share local interface array
3743 result = local_ifs;
3744 } else {
3745 objArrayHandle nullHandle;
3746 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3747 result = objArrayHandle(THREAD, new_objarray);
3748 int index = 0;
3749 // Copy down from superclass
3750 if (super.not_null()) {
3751 append_interfaces(result, index, super->transitive_interfaces());
3752 }
3753 // Copy down from local interfaces' superinterfaces
3754 for (int i = 0; i < local_ifs->length(); i++) {
3755 klassOop l = klassOop(local_ifs->obj_at(i));
3756 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3757 }
3758 // Finally add local interfaces
3759 append_interfaces(result, index, local_ifs());
3761 // Check if duplicates were removed
3762 if (index != max_transitive_size) {
3763 assert(index < max_transitive_size, "just checking");
3764 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3765 for (int i = 0; i < index; i++) {
3766 oop e = result->obj_at(i);
3767 assert(e != NULL, "just checking");
3768 new_result->obj_at_put(i, e);
3769 }
3770 result = objArrayHandle(THREAD, new_result);
3771 }
3772 }
3773 return result;
3774 }
3777 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3778 klassOop super = this_klass->super();
3779 if ((super != NULL) &&
3780 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3781 ResourceMark rm(THREAD);
3782 Exceptions::fthrow(
3783 THREAD_AND_LOCATION,
3784 vmSymbolHandles::java_lang_IllegalAccessError(),
3785 "class %s cannot access its superclass %s",
3786 this_klass->external_name(),
3787 instanceKlass::cast(super)->external_name()
3788 );
3789 return;
3790 }
3791 }
3794 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3795 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3796 int lng = local_interfaces->length();
3797 for (int i = lng - 1; i >= 0; i--) {
3798 klassOop k = klassOop(local_interfaces->obj_at(i));
3799 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3800 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3801 ResourceMark rm(THREAD);
3802 Exceptions::fthrow(
3803 THREAD_AND_LOCATION,
3804 vmSymbolHandles::java_lang_IllegalAccessError(),
3805 "class %s cannot access its superinterface %s",
3806 this_klass->external_name(),
3807 instanceKlass::cast(k)->external_name()
3808 );
3809 return;
3810 }
3811 }
3812 }
3815 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3816 objArrayHandle methods (THREAD, this_klass->methods());
3817 int num_methods = methods->length();
3819 // go thru each method and check if it overrides a final method
3820 for (int index = 0; index < num_methods; index++) {
3821 methodOop m = (methodOop)methods->obj_at(index);
3823 // skip private, static and <init> methods
3824 if ((!m->is_private()) &&
3825 (!m->is_static()) &&
3826 (m->name() != vmSymbols::object_initializer_name())) {
3828 symbolOop name = m->name();
3829 symbolOop signature = m->signature();
3830 klassOop k = this_klass->super();
3831 methodOop super_m = NULL;
3832 while (k != NULL) {
3833 // skip supers that don't have final methods.
3834 if (k->klass_part()->has_final_method()) {
3835 // lookup a matching method in the super class hierarchy
3836 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3837 if (super_m == NULL) {
3838 break; // didn't find any match; get out
3839 }
3841 if (super_m->is_final() &&
3842 // matching method in super is final
3843 (Reflection::verify_field_access(this_klass->as_klassOop(),
3844 super_m->method_holder(),
3845 super_m->method_holder(),
3846 super_m->access_flags(), false))
3847 // this class can access super final method and therefore override
3848 ) {
3849 ResourceMark rm(THREAD);
3850 Exceptions::fthrow(
3851 THREAD_AND_LOCATION,
3852 vmSymbolHandles::java_lang_VerifyError(),
3853 "class %s overrides final method %s.%s",
3854 this_klass->external_name(),
3855 name->as_C_string(),
3856 signature->as_C_string()
3857 );
3858 return;
3859 }
3861 // continue to look from super_m's holder's super.
3862 k = instanceKlass::cast(super_m->method_holder())->super();
3863 continue;
3864 }
3866 k = k->klass_part()->super();
3867 }
3868 }
3869 }
3870 }
3873 // assumes that this_klass is an interface
3874 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3875 assert(this_klass->is_interface(), "not an interface");
3876 objArrayHandle methods (THREAD, this_klass->methods());
3877 int num_methods = methods->length();
3879 for (int index = 0; index < num_methods; index++) {
3880 methodOop m = (methodOop)methods->obj_at(index);
3881 // if m is static and not the init method, throw a verify error
3882 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3883 ResourceMark rm(THREAD);
3884 Exceptions::fthrow(
3885 THREAD_AND_LOCATION,
3886 vmSymbolHandles::java_lang_VerifyError(),
3887 "Illegal static method %s in interface %s",
3888 m->name()->as_C_string(),
3889 this_klass->external_name()
3890 );
3891 return;
3892 }
3893 }
3894 }
3896 // utility methods for format checking
3898 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3899 if (!_need_verify) { return; }
3901 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3902 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3903 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3904 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3905 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3906 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3907 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3909 if ((is_abstract && is_final) ||
3910 (is_interface && !is_abstract) ||
3911 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3912 (!is_interface && major_gte_15 && is_annotation)) {
3913 ResourceMark rm(THREAD);
3914 Exceptions::fthrow(
3915 THREAD_AND_LOCATION,
3916 vmSymbolHandles::java_lang_ClassFormatError(),
3917 "Illegal class modifiers in class %s: 0x%X",
3918 _class_name->as_C_string(), flags
3919 );
3920 return;
3921 }
3922 }
3924 bool ClassFileParser::has_illegal_visibility(jint flags) {
3925 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3926 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3927 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3929 return ((is_public && is_protected) ||
3930 (is_public && is_private) ||
3931 (is_protected && is_private));
3932 }
3934 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3935 u2 max_version =
3936 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3937 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3938 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3939 (major <= max_version) &&
3940 ((major != max_version) ||
3941 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3942 }
3944 void ClassFileParser::verify_legal_field_modifiers(
3945 jint flags, bool is_interface, TRAPS) {
3946 if (!_need_verify) { return; }
3948 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3949 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3950 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3951 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3952 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3953 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3954 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3955 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3956 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3958 bool is_illegal = false;
3960 if (is_interface) {
3961 if (!is_public || !is_static || !is_final || is_private ||
3962 is_protected || is_volatile || is_transient ||
3963 (major_gte_15 && is_enum)) {
3964 is_illegal = true;
3965 }
3966 } else { // not interface
3967 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3968 is_illegal = true;
3969 }
3970 }
3972 if (is_illegal) {
3973 ResourceMark rm(THREAD);
3974 Exceptions::fthrow(
3975 THREAD_AND_LOCATION,
3976 vmSymbolHandles::java_lang_ClassFormatError(),
3977 "Illegal field modifiers in class %s: 0x%X",
3978 _class_name->as_C_string(), flags);
3979 return;
3980 }
3981 }
3983 void ClassFileParser::verify_legal_method_modifiers(
3984 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3985 if (!_need_verify) { return; }
3987 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3988 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3989 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3990 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3991 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3992 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3993 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3994 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3995 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3996 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3997 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3999 bool is_illegal = false;
4001 if (is_interface) {
4002 if (!is_abstract || !is_public || is_static || is_final ||
4003 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4004 is_illegal = true;
4005 }
4006 } else { // not interface
4007 if (is_initializer) {
4008 if (is_static || is_final || is_synchronized || is_native ||
4009 is_abstract || (major_gte_15 && is_bridge)) {
4010 is_illegal = true;
4011 }
4012 } else { // not initializer
4013 if (is_abstract) {
4014 if ((is_final || is_native || is_private || is_static ||
4015 (major_gte_15 && (is_synchronized || is_strict)))) {
4016 is_illegal = true;
4017 }
4018 }
4019 if (has_illegal_visibility(flags)) {
4020 is_illegal = true;
4021 }
4022 }
4023 }
4025 if (is_illegal) {
4026 ResourceMark rm(THREAD);
4027 Exceptions::fthrow(
4028 THREAD_AND_LOCATION,
4029 vmSymbolHandles::java_lang_ClassFormatError(),
4030 "Method %s in class %s has illegal modifiers: 0x%X",
4031 name->as_C_string(), _class_name->as_C_string(), flags);
4032 return;
4033 }
4034 }
4036 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4037 assert(_need_verify, "only called when _need_verify is true");
4038 int i = 0;
4039 int count = length >> 2;
4040 for (int k=0; k<count; k++) {
4041 unsigned char b0 = buffer[i];
4042 unsigned char b1 = buffer[i+1];
4043 unsigned char b2 = buffer[i+2];
4044 unsigned char b3 = buffer[i+3];
4045 // For an unsigned char v,
4046 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4047 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4048 unsigned char res = b0 | b0 - 1 |
4049 b1 | b1 - 1 |
4050 b2 | b2 - 1 |
4051 b3 | b3 - 1;
4052 if (res >= 128) break;
4053 i += 4;
4054 }
4055 for(; i < length; i++) {
4056 unsigned short c;
4057 // no embedded zeros
4058 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4059 if(buffer[i] < 128) {
4060 continue;
4061 }
4062 if ((i + 5) < length) { // see if it's legal supplementary character
4063 if (UTF8::is_supplementary_character(&buffer[i])) {
4064 c = UTF8::get_supplementary_character(&buffer[i]);
4065 i += 5;
4066 continue;
4067 }
4068 }
4069 switch (buffer[i] >> 4) {
4070 default: break;
4071 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4072 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4073 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4074 c = (buffer[i] & 0x1F) << 6;
4075 i++;
4076 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4077 c += buffer[i] & 0x3F;
4078 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4079 // for classes with major > 47, c must a null or a character in its shortest form
4080 break;
4081 }
4082 }
4083 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4084 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4085 c = (buffer[i] & 0xF) << 12;
4086 i += 2;
4087 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4088 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4089 if (_major_version <= 47 || c >= 0x800) {
4090 // for classes with major > 47, c must be in its shortest form
4091 break;
4092 }
4093 }
4094 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4095 } // end of switch
4096 } // end of for
4097 }
4099 // Checks if name is a legal class name.
4100 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
4101 if (!_need_verify || _relax_verify) { return; }
4103 char buf[fixed_buffer_size];
4104 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4105 unsigned int length = name->utf8_length();
4106 bool legal = false;
4108 if (length > 0) {
4109 char* p;
4110 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4111 p = skip_over_field_signature(bytes, false, length, CHECK);
4112 legal = (p != NULL) && ((p - bytes) == (int)length);
4113 } else if (_major_version < JAVA_1_5_VERSION) {
4114 if (bytes[0] != '<') {
4115 p = skip_over_field_name(bytes, true, length);
4116 legal = (p != NULL) && ((p - bytes) == (int)length);
4117 }
4118 } else {
4119 // 4900761: relax the constraints based on JSR202 spec
4120 // Class names may be drawn from the entire Unicode character set.
4121 // Identifiers between '/' must be unqualified names.
4122 // The utf8 string has been verified when parsing cpool entries.
4123 legal = verify_unqualified_name(bytes, length, LegalClass);
4124 }
4125 }
4126 if (!legal) {
4127 ResourceMark rm(THREAD);
4128 Exceptions::fthrow(
4129 THREAD_AND_LOCATION,
4130 vmSymbolHandles::java_lang_ClassFormatError(),
4131 "Illegal class name \"%s\" in class file %s", bytes,
4132 _class_name->as_C_string()
4133 );
4134 return;
4135 }
4136 }
4138 // Checks if name is a legal field name.
4139 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
4140 if (!_need_verify || _relax_verify) { return; }
4142 char buf[fixed_buffer_size];
4143 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4144 unsigned int length = name->utf8_length();
4145 bool legal = false;
4147 if (length > 0) {
4148 if (_major_version < JAVA_1_5_VERSION) {
4149 if (bytes[0] != '<') {
4150 char* p = skip_over_field_name(bytes, false, length);
4151 legal = (p != NULL) && ((p - bytes) == (int)length);
4152 }
4153 } else {
4154 // 4881221: relax the constraints based on JSR202 spec
4155 legal = verify_unqualified_name(bytes, length, LegalField);
4156 }
4157 }
4159 if (!legal) {
4160 ResourceMark rm(THREAD);
4161 Exceptions::fthrow(
4162 THREAD_AND_LOCATION,
4163 vmSymbolHandles::java_lang_ClassFormatError(),
4164 "Illegal field name \"%s\" in class %s", bytes,
4165 _class_name->as_C_string()
4166 );
4167 return;
4168 }
4169 }
4171 // Checks if name is a legal method name.
4172 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
4173 if (!_need_verify || _relax_verify) { return; }
4175 assert(!name.is_null(), "method name is null");
4176 char buf[fixed_buffer_size];
4177 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4178 unsigned int length = name->utf8_length();
4179 bool legal = false;
4181 if (length > 0) {
4182 if (bytes[0] == '<') {
4183 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4184 legal = true;
4185 }
4186 } else if (_major_version < JAVA_1_5_VERSION) {
4187 char* p;
4188 p = skip_over_field_name(bytes, false, length);
4189 legal = (p != NULL) && ((p - bytes) == (int)length);
4190 } else {
4191 // 4881221: relax the constraints based on JSR202 spec
4192 legal = verify_unqualified_name(bytes, length, LegalMethod);
4193 }
4194 }
4196 if (!legal) {
4197 ResourceMark rm(THREAD);
4198 Exceptions::fthrow(
4199 THREAD_AND_LOCATION,
4200 vmSymbolHandles::java_lang_ClassFormatError(),
4201 "Illegal method name \"%s\" in class %s", bytes,
4202 _class_name->as_C_string()
4203 );
4204 return;
4205 }
4206 }
4209 // Checks if signature is a legal field signature.
4210 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4211 if (!_need_verify) { return; }
4213 char buf[fixed_buffer_size];
4214 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4215 unsigned int length = signature->utf8_length();
4216 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4218 if (p == NULL || (p - bytes) != (int)length) {
4219 throwIllegalSignature("Field", name, signature, CHECK);
4220 }
4221 }
4223 // Checks if signature is a legal method signature.
4224 // Returns number of parameters
4225 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4226 if (!_need_verify) {
4227 // make sure caller's args_size will be less than 0 even for non-static
4228 // method so it will be recomputed in compute_size_of_parameters().
4229 return -2;
4230 }
4232 unsigned int args_size = 0;
4233 char buf[fixed_buffer_size];
4234 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4235 unsigned int length = signature->utf8_length();
4236 char* nextp;
4238 // The first character must be a '('
4239 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4240 length--;
4241 // Skip over legal field signatures
4242 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4243 while ((length > 0) && (nextp != NULL)) {
4244 args_size++;
4245 if (p[0] == 'J' || p[0] == 'D') {
4246 args_size++;
4247 }
4248 length -= nextp - p;
4249 p = nextp;
4250 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4251 }
4252 // The first non-signature thing better be a ')'
4253 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4254 length--;
4255 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4256 // All internal methods must return void
4257 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4258 return args_size;
4259 }
4260 } else {
4261 // Now we better just have a return value
4262 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4263 if (nextp && ((int)length == (nextp - p))) {
4264 return args_size;
4265 }
4266 }
4267 }
4268 }
4269 // Report error
4270 throwIllegalSignature("Method", name, signature, CHECK_0);
4271 return 0;
4272 }
4275 // Unqualified names may not contain the characters '.', ';', or '/'.
4276 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
4277 // Note that method names may not be <init> or <clinit> in this method.
4278 // Because these names have been checked as special cases before calling this method
4279 // in verify_legal_method_name.
4280 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4281 jchar ch;
4283 for (char* p = name; p != name + length; ) {
4284 ch = *p;
4285 if (ch < 128) {
4286 p++;
4287 if (ch == '.' || ch == ';') {
4288 return false; // do not permit '.' or ';'
4289 }
4290 if (type != LegalClass && ch == '/') {
4291 return false; // do not permit '/' unless it's class name
4292 }
4293 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4294 return false; // do not permit '<' or '>' in method names
4295 }
4296 } else {
4297 char* tmp_p = UTF8::next(p, &ch);
4298 p = tmp_p;
4299 }
4300 }
4301 return true;
4302 }
4305 // Take pointer to a string. Skip over the longest part of the string that could
4306 // be taken as a fieldname. Allow '/' if slash_ok is true.
4307 // Return a pointer to just past the fieldname.
4308 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4309 // being true, we saw consecutive slashes (meaning we were looking for a
4310 // qualified path but found something that was badly-formed).
4311 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4312 char* p;
4313 jchar ch;
4314 jboolean last_is_slash = false;
4315 jboolean not_first_ch = false;
4317 for (p = name; p != name + length; not_first_ch = true) {
4318 char* old_p = p;
4319 ch = *p;
4320 if (ch < 128) {
4321 p++;
4322 // quick check for ascii
4323 if ((ch >= 'a' && ch <= 'z') ||
4324 (ch >= 'A' && ch <= 'Z') ||
4325 (ch == '_' || ch == '$') ||
4326 (not_first_ch && ch >= '0' && ch <= '9')) {
4327 last_is_slash = false;
4328 continue;
4329 }
4330 if (slash_ok && ch == '/') {
4331 if (last_is_slash) {
4332 return NULL; // Don't permit consecutive slashes
4333 }
4334 last_is_slash = true;
4335 continue;
4336 }
4337 } else {
4338 jint unicode_ch;
4339 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4340 p = tmp_p;
4341 last_is_slash = false;
4342 // Check if ch is Java identifier start or is Java identifier part
4343 // 4672820: call java.lang.Character methods directly without generating separate tables.
4344 EXCEPTION_MARK;
4345 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4347 // return value
4348 JavaValue result(T_BOOLEAN);
4349 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4350 JavaCallArguments args;
4351 args.push_int(unicode_ch);
4353 // public static boolean isJavaIdentifierStart(char ch);
4354 JavaCalls::call_static(&result,
4355 klass,
4356 vmSymbolHandles::isJavaIdentifierStart_name(),
4357 vmSymbolHandles::int_bool_signature(),
4358 &args,
4359 THREAD);
4361 if (HAS_PENDING_EXCEPTION) {
4362 CLEAR_PENDING_EXCEPTION;
4363 return 0;
4364 }
4365 if (result.get_jboolean()) {
4366 continue;
4367 }
4369 if (not_first_ch) {
4370 // public static boolean isJavaIdentifierPart(char ch);
4371 JavaCalls::call_static(&result,
4372 klass,
4373 vmSymbolHandles::isJavaIdentifierPart_name(),
4374 vmSymbolHandles::int_bool_signature(),
4375 &args,
4376 THREAD);
4378 if (HAS_PENDING_EXCEPTION) {
4379 CLEAR_PENDING_EXCEPTION;
4380 return 0;
4381 }
4383 if (result.get_jboolean()) {
4384 continue;
4385 }
4386 }
4387 }
4388 return (not_first_ch) ? old_p : NULL;
4389 }
4390 return (not_first_ch) ? p : NULL;
4391 }
4394 // Take pointer to a string. Skip over the longest part of the string that could
4395 // be taken as a field signature. Allow "void" if void_ok.
4396 // Return a pointer to just past the signature.
4397 // Return NULL if no legal signature is found.
4398 char* ClassFileParser::skip_over_field_signature(char* signature,
4399 bool void_ok,
4400 unsigned int length,
4401 TRAPS) {
4402 unsigned int array_dim = 0;
4403 while (length > 0) {
4404 switch (signature[0]) {
4405 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4406 case JVM_SIGNATURE_BOOLEAN:
4407 case JVM_SIGNATURE_BYTE:
4408 case JVM_SIGNATURE_CHAR:
4409 case JVM_SIGNATURE_SHORT:
4410 case JVM_SIGNATURE_INT:
4411 case JVM_SIGNATURE_FLOAT:
4412 case JVM_SIGNATURE_LONG:
4413 case JVM_SIGNATURE_DOUBLE:
4414 return signature + 1;
4415 case JVM_SIGNATURE_CLASS: {
4416 if (_major_version < JAVA_1_5_VERSION) {
4417 // Skip over the class name if one is there
4418 char* p = skip_over_field_name(signature + 1, true, --length);
4420 // The next character better be a semicolon
4421 if (p && (p - signature) > 1 && p[0] == ';') {
4422 return p + 1;
4423 }
4424 } else {
4425 // 4900761: For class version > 48, any unicode is allowed in class name.
4426 length--;
4427 signature++;
4428 while (length > 0 && signature[0] != ';') {
4429 if (signature[0] == '.') {
4430 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4431 }
4432 length--;
4433 signature++;
4434 }
4435 if (signature[0] == ';') { return signature + 1; }
4436 }
4438 return NULL;
4439 }
4440 case JVM_SIGNATURE_ARRAY:
4441 array_dim++;
4442 if (array_dim > 255) {
4443 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4444 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4445 }
4446 // The rest of what's there better be a legal signature
4447 signature++;
4448 length--;
4449 void_ok = false;
4450 break;
4452 default:
4453 return NULL;
4454 }
4455 }
4456 return NULL;
4457 }