Thu, 01 Sep 2011 01:31:25 -0700
7079673: JSR 292: C1 should inline bytecoded method handle adapters
Reviewed-by: never
1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/verificationType.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPoolOop.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/instanceMirrorKlass.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/klassOop.hpp"
43 #include "oops/klassVtable.hpp"
44 #include "oops/methodOop.hpp"
45 #include "oops/symbol.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/perfData.hpp"
49 #include "runtime/reflection.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/timer.hpp"
52 #include "services/classLoadingService.hpp"
53 #include "services/threadService.hpp"
55 // We generally try to create the oops directly when parsing, rather than
56 // allocating temporary data structures and copying the bytes twice. A
57 // temporary area is only needed when parsing utf8 entries in the constant
58 // pool and when parsing line number tables.
60 // We add assert in debug mode when class format is not checked.
62 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
63 #define JAVA_MIN_SUPPORTED_VERSION 45
64 #define JAVA_MAX_SUPPORTED_VERSION 51
65 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
67 // Used for two backward compatibility reasons:
68 // - to check for new additions to the class file format in JDK1.5
69 // - to check for bug fixes in the format checker in JDK1.5
70 #define JAVA_1_5_VERSION 49
72 // Used for backward compatibility reasons:
73 // - to check for javac bug fixes that happened after 1.5
74 // - also used as the max version when running in jdk6
75 #define JAVA_6_VERSION 50
77 // Used for backward compatibility reasons:
78 // - to check NameAndType_info signatures more aggressively
79 #define JAVA_7_VERSION 51
82 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
83 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
84 // this function (_current can be allocated in a register, with scalar
85 // replacement of aggregates). The _current pointer is copied back to
86 // stream() when this function returns. DON'T call another method within
87 // this method that uses stream().
88 ClassFileStream* cfs0 = stream();
89 ClassFileStream cfs1 = *cfs0;
90 ClassFileStream* cfs = &cfs1;
91 #ifdef ASSERT
92 assert(cfs->allocated_on_stack(),"should be local");
93 u1* old_current = cfs0->current();
94 #endif
96 // Used for batching symbol allocations.
97 const char* names[SymbolTable::symbol_alloc_batch_size];
98 int lengths[SymbolTable::symbol_alloc_batch_size];
99 int indices[SymbolTable::symbol_alloc_batch_size];
100 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
101 int names_count = 0;
103 // parsing Index 0 is unused
104 for (int index = 1; index < length; index++) {
105 // Each of the following case guarantees one more byte in the stream
106 // for the following tag or the access_flags following constant pool,
107 // so we don't need bounds-check for reading tag.
108 u1 tag = cfs->get_u1_fast();
109 switch (tag) {
110 case JVM_CONSTANT_Class :
111 {
112 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
113 u2 name_index = cfs->get_u2_fast();
114 cp->klass_index_at_put(index, name_index);
115 }
116 break;
117 case JVM_CONSTANT_Fieldref :
118 {
119 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
120 u2 class_index = cfs->get_u2_fast();
121 u2 name_and_type_index = cfs->get_u2_fast();
122 cp->field_at_put(index, class_index, name_and_type_index);
123 }
124 break;
125 case JVM_CONSTANT_Methodref :
126 {
127 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
128 u2 class_index = cfs->get_u2_fast();
129 u2 name_and_type_index = cfs->get_u2_fast();
130 cp->method_at_put(index, class_index, name_and_type_index);
131 }
132 break;
133 case JVM_CONSTANT_InterfaceMethodref :
134 {
135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
136 u2 class_index = cfs->get_u2_fast();
137 u2 name_and_type_index = cfs->get_u2_fast();
138 cp->interface_method_at_put(index, class_index, name_and_type_index);
139 }
140 break;
141 case JVM_CONSTANT_String :
142 {
143 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
144 u2 string_index = cfs->get_u2_fast();
145 cp->string_index_at_put(index, string_index);
146 }
147 break;
148 case JVM_CONSTANT_MethodHandle :
149 case JVM_CONSTANT_MethodType :
150 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
151 classfile_parse_error(
152 "Class file version does not support constant tag %u in class file %s",
153 tag, CHECK);
154 }
155 if (!EnableInvokeDynamic) {
156 classfile_parse_error(
157 "This JVM does not support constant tag %u in class file %s",
158 tag, CHECK);
159 }
160 if (tag == JVM_CONSTANT_MethodHandle) {
161 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
162 u1 ref_kind = cfs->get_u1_fast();
163 u2 method_index = cfs->get_u2_fast();
164 cp->method_handle_index_at_put(index, ref_kind, method_index);
165 } else if (tag == JVM_CONSTANT_MethodType) {
166 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
167 u2 signature_index = cfs->get_u2_fast();
168 cp->method_type_index_at_put(index, signature_index);
169 } else {
170 ShouldNotReachHere();
171 }
172 break;
173 case JVM_CONSTANT_InvokeDynamic :
174 {
175 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
176 classfile_parse_error(
177 "Class file version does not support constant tag %u in class file %s",
178 tag, CHECK);
179 }
180 if (!EnableInvokeDynamic) {
181 classfile_parse_error(
182 "This JVM does not support constant tag %u in class file %s",
183 tag, CHECK);
184 }
185 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
186 u2 bootstrap_specifier_index = cfs->get_u2_fast();
187 u2 name_and_type_index = cfs->get_u2_fast();
188 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
189 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
190 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
191 }
192 break;
193 case JVM_CONSTANT_Integer :
194 {
195 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
196 u4 bytes = cfs->get_u4_fast();
197 cp->int_at_put(index, (jint) bytes);
198 }
199 break;
200 case JVM_CONSTANT_Float :
201 {
202 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
203 u4 bytes = cfs->get_u4_fast();
204 cp->float_at_put(index, *(jfloat*)&bytes);
205 }
206 break;
207 case JVM_CONSTANT_Long :
208 // A mangled type might cause you to overrun allocated memory
209 guarantee_property(index+1 < length,
210 "Invalid constant pool entry %u in class file %s",
211 index, CHECK);
212 {
213 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
214 u8 bytes = cfs->get_u8_fast();
215 cp->long_at_put(index, bytes);
216 }
217 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
218 break;
219 case JVM_CONSTANT_Double :
220 // A mangled type might cause you to overrun allocated memory
221 guarantee_property(index+1 < length,
222 "Invalid constant pool entry %u in class file %s",
223 index, CHECK);
224 {
225 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
226 u8 bytes = cfs->get_u8_fast();
227 cp->double_at_put(index, *(jdouble*)&bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_NameAndType :
232 {
233 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
234 u2 name_index = cfs->get_u2_fast();
235 u2 signature_index = cfs->get_u2_fast();
236 cp->name_and_type_at_put(index, name_index, signature_index);
237 }
238 break;
239 case JVM_CONSTANT_Utf8 :
240 {
241 cfs->guarantee_more(2, CHECK); // utf8_length
242 u2 utf8_length = cfs->get_u2_fast();
243 u1* utf8_buffer = cfs->get_u1_buffer();
244 assert(utf8_buffer != NULL, "null utf8 buffer");
245 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
246 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
247 cfs->skip_u1_fast(utf8_length);
249 // Before storing the symbol, make sure it's legal
250 if (_need_verify) {
251 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
252 }
254 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
255 Handle patch = clear_cp_patch_at(index);
256 guarantee_property(java_lang_String::is_instance(patch()),
257 "Illegal utf8 patch at %d in class file %s",
258 index, CHECK);
259 char* str = java_lang_String::as_utf8_string(patch());
260 // (could use java_lang_String::as_symbol instead, but might as well batch them)
261 utf8_buffer = (u1*) str;
262 utf8_length = (int) strlen(str);
263 }
265 unsigned int hash;
266 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
267 if (result == NULL) {
268 names[names_count] = (char*)utf8_buffer;
269 lengths[names_count] = utf8_length;
270 indices[names_count] = index;
271 hashValues[names_count++] = hash;
272 if (names_count == SymbolTable::symbol_alloc_batch_size) {
273 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
274 names_count = 0;
275 }
276 } else {
277 cp->symbol_at_put(index, result);
278 }
279 }
280 break;
281 default:
282 classfile_parse_error(
283 "Unknown constant tag %u in class file %s", tag, CHECK);
284 break;
285 }
286 }
288 // Allocate the remaining symbols
289 if (names_count > 0) {
290 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
291 }
293 // Copy _current pointer of local copy back to stream().
294 #ifdef ASSERT
295 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
296 #endif
297 cfs0->set_current(cfs1.current());
298 }
300 // This class unreferences constant pool symbols if an error has occurred
301 // while parsing the class before it is assigned into the class.
302 // If it gets an error after that it is unloaded and the constant pool will
303 // be cleaned up then.
304 class ConstantPoolCleaner : public StackObj {
305 constantPoolHandle _cphandle;
306 bool _in_error;
307 public:
308 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
309 ~ConstantPoolCleaner() {
310 if (_in_error && _cphandle.not_null()) {
311 _cphandle->unreference_symbols();
312 }
313 }
314 void set_in_error(bool clean) { _in_error = clean; }
315 };
317 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
319 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
320 ClassFileStream* cfs = stream();
321 constantPoolHandle nullHandle;
323 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
324 u2 length = cfs->get_u2_fast();
325 guarantee_property(
326 length >= 1, "Illegal constant pool size %u in class file %s",
327 length, CHECK_(nullHandle));
328 constantPoolOop constant_pool =
329 oopFactory::new_constantPool(length,
330 oopDesc::IsSafeConc,
331 CHECK_(nullHandle));
332 constantPoolHandle cp (THREAD, constant_pool);
334 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
335 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
337 // parsing constant pool entries
338 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
340 int index = 1; // declared outside of loops for portability
342 // first verification pass - validate cross references and fixup class and string constants
343 for (index = 1; index < length; index++) { // Index 0 is unused
344 jbyte tag = cp->tag_at(index).value();
345 switch (tag) {
346 case JVM_CONSTANT_Class :
347 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
348 break;
349 case JVM_CONSTANT_Fieldref :
350 // fall through
351 case JVM_CONSTANT_Methodref :
352 // fall through
353 case JVM_CONSTANT_InterfaceMethodref : {
354 if (!_need_verify) break;
355 int klass_ref_index = cp->klass_ref_index_at(index);
356 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
357 check_property(valid_cp_range(klass_ref_index, length) &&
358 is_klass_reference(cp, klass_ref_index),
359 "Invalid constant pool index %u in class file %s",
360 klass_ref_index,
361 CHECK_(nullHandle));
362 check_property(valid_cp_range(name_and_type_ref_index, length) &&
363 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
364 "Invalid constant pool index %u in class file %s",
365 name_and_type_ref_index,
366 CHECK_(nullHandle));
367 break;
368 }
369 case JVM_CONSTANT_String :
370 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
371 break;
372 case JVM_CONSTANT_Integer :
373 break;
374 case JVM_CONSTANT_Float :
375 break;
376 case JVM_CONSTANT_Long :
377 case JVM_CONSTANT_Double :
378 index++;
379 check_property(
380 (index < length && cp->tag_at(index).is_invalid()),
381 "Improper constant pool long/double index %u in class file %s",
382 index, CHECK_(nullHandle));
383 break;
384 case JVM_CONSTANT_NameAndType : {
385 if (!_need_verify) break;
386 int name_ref_index = cp->name_ref_index_at(index);
387 int signature_ref_index = cp->signature_ref_index_at(index);
388 check_property(
389 valid_cp_range(name_ref_index, length) &&
390 cp->tag_at(name_ref_index).is_utf8(),
391 "Invalid constant pool index %u in class file %s",
392 name_ref_index, CHECK_(nullHandle));
393 check_property(
394 valid_cp_range(signature_ref_index, length) &&
395 cp->tag_at(signature_ref_index).is_utf8(),
396 "Invalid constant pool index %u in class file %s",
397 signature_ref_index, CHECK_(nullHandle));
398 break;
399 }
400 case JVM_CONSTANT_Utf8 :
401 break;
402 case JVM_CONSTANT_UnresolvedClass : // fall-through
403 case JVM_CONSTANT_UnresolvedClassInError:
404 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
405 break;
406 case JVM_CONSTANT_ClassIndex :
407 {
408 int class_index = cp->klass_index_at(index);
409 check_property(
410 valid_cp_range(class_index, length) &&
411 cp->tag_at(class_index).is_utf8(),
412 "Invalid constant pool index %u in class file %s",
413 class_index, CHECK_(nullHandle));
414 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
415 }
416 break;
417 case JVM_CONSTANT_UnresolvedString :
418 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
419 break;
420 case JVM_CONSTANT_StringIndex :
421 {
422 int string_index = cp->string_index_at(index);
423 check_property(
424 valid_cp_range(string_index, length) &&
425 cp->tag_at(string_index).is_utf8(),
426 "Invalid constant pool index %u in class file %s",
427 string_index, CHECK_(nullHandle));
428 Symbol* sym = cp->symbol_at(string_index);
429 cp->unresolved_string_at_put(index, sym);
430 }
431 break;
432 case JVM_CONSTANT_MethodHandle :
433 {
434 int ref_index = cp->method_handle_index_at(index);
435 check_property(
436 valid_cp_range(ref_index, length) &&
437 EnableInvokeDynamic,
438 "Invalid constant pool index %u in class file %s",
439 ref_index, CHECK_(nullHandle));
440 constantTag tag = cp->tag_at(ref_index);
441 int ref_kind = cp->method_handle_ref_kind_at(index);
442 switch (ref_kind) {
443 case JVM_REF_getField:
444 case JVM_REF_getStatic:
445 case JVM_REF_putField:
446 case JVM_REF_putStatic:
447 check_property(
448 tag.is_field(),
449 "Invalid constant pool index %u in class file %s (not a field)",
450 ref_index, CHECK_(nullHandle));
451 break;
452 case JVM_REF_invokeVirtual:
453 case JVM_REF_invokeStatic:
454 case JVM_REF_invokeSpecial:
455 case JVM_REF_newInvokeSpecial:
456 check_property(
457 tag.is_method(),
458 "Invalid constant pool index %u in class file %s (not a method)",
459 ref_index, CHECK_(nullHandle));
460 break;
461 case JVM_REF_invokeInterface:
462 check_property(
463 tag.is_interface_method(),
464 "Invalid constant pool index %u in class file %s (not an interface method)",
465 ref_index, CHECK_(nullHandle));
466 break;
467 default:
468 classfile_parse_error(
469 "Bad method handle kind at constant pool index %u in class file %s",
470 index, CHECK_(nullHandle));
471 }
472 // Keep the ref_index unchanged. It will be indirected at link-time.
473 }
474 break;
475 case JVM_CONSTANT_MethodType :
476 {
477 int ref_index = cp->method_type_index_at(index);
478 check_property(
479 valid_cp_range(ref_index, length) &&
480 cp->tag_at(ref_index).is_utf8() &&
481 EnableInvokeDynamic,
482 "Invalid constant pool index %u in class file %s",
483 ref_index, CHECK_(nullHandle));
484 }
485 break;
486 case JVM_CONSTANT_InvokeDynamic :
487 {
488 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
489 check_property(valid_cp_range(name_and_type_ref_index, length) &&
490 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
491 "Invalid constant pool index %u in class file %s",
492 name_and_type_ref_index,
493 CHECK_(nullHandle));
494 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
495 break;
496 }
497 default:
498 fatal(err_msg("bad constant pool tag value %u",
499 cp->tag_at(index).value()));
500 ShouldNotReachHere();
501 break;
502 } // end of switch
503 } // end of for
505 if (_cp_patches != NULL) {
506 // need to treat this_class specially...
507 assert(EnableInvokeDynamic, "");
508 int this_class_index;
509 {
510 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
511 u1* mark = cfs->current();
512 u2 flags = cfs->get_u2_fast();
513 this_class_index = cfs->get_u2_fast();
514 cfs->set_current(mark); // revert to mark
515 }
517 for (index = 1; index < length; index++) { // Index 0 is unused
518 if (has_cp_patch_at(index)) {
519 guarantee_property(index != this_class_index,
520 "Illegal constant pool patch to self at %d in class file %s",
521 index, CHECK_(nullHandle));
522 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
523 }
524 }
525 // Ensure that all the patches have been used.
526 for (index = 0; index < _cp_patches->length(); index++) {
527 guarantee_property(!has_cp_patch_at(index),
528 "Unused constant pool patch at %d in class file %s",
529 index, CHECK_(nullHandle));
530 }
531 }
533 if (!_need_verify) {
534 cp_in_error.set_in_error(false);
535 return cp;
536 }
538 // second verification pass - checks the strings are of the right format.
539 // but not yet to the other entries
540 for (index = 1; index < length; index++) {
541 jbyte tag = cp->tag_at(index).value();
542 switch (tag) {
543 case JVM_CONSTANT_UnresolvedClass: {
544 Symbol* class_name = cp->unresolved_klass_at(index);
545 // check the name, even if _cp_patches will overwrite it
546 verify_legal_class_name(class_name, CHECK_(nullHandle));
547 break;
548 }
549 case JVM_CONSTANT_NameAndType: {
550 if (_need_verify && _major_version >= JAVA_7_VERSION) {
551 int sig_index = cp->signature_ref_index_at(index);
552 int name_index = cp->name_ref_index_at(index);
553 Symbol* name = cp->symbol_at(name_index);
554 Symbol* sig = cp->symbol_at(sig_index);
555 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
556 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
557 } else {
558 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
559 }
560 }
561 break;
562 }
563 case JVM_CONSTANT_InvokeDynamic:
564 case JVM_CONSTANT_Fieldref:
565 case JVM_CONSTANT_Methodref:
566 case JVM_CONSTANT_InterfaceMethodref: {
567 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
568 // already verified to be utf8
569 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
570 // already verified to be utf8
571 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
572 Symbol* name = cp->symbol_at(name_ref_index);
573 Symbol* signature = cp->symbol_at(signature_ref_index);
574 if (tag == JVM_CONSTANT_Fieldref) {
575 verify_legal_field_name(name, CHECK_(nullHandle));
576 if (_need_verify && _major_version >= JAVA_7_VERSION) {
577 // Signature is verified above, when iterating NameAndType_info.
578 // Need only to be sure it's the right type.
579 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
580 throwIllegalSignature(
581 "Field", name, signature, CHECK_(nullHandle));
582 }
583 } else {
584 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
585 }
586 } else {
587 verify_legal_method_name(name, CHECK_(nullHandle));
588 if (_need_verify && _major_version >= JAVA_7_VERSION) {
589 // Signature is verified above, when iterating NameAndType_info.
590 // Need only to be sure it's the right type.
591 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
592 throwIllegalSignature(
593 "Method", name, signature, CHECK_(nullHandle));
594 }
595 } else {
596 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
597 }
598 if (tag == JVM_CONSTANT_Methodref) {
599 // 4509014: If a class method name begins with '<', it must be "<init>".
600 assert(name != NULL, "method name in constant pool is null");
601 unsigned int name_len = name->utf8_length();
602 assert(name_len > 0, "bad method name"); // already verified as legal name
603 if (name->byte_at(0) == '<') {
604 if (name != vmSymbols::object_initializer_name()) {
605 classfile_parse_error(
606 "Bad method name at constant pool index %u in class file %s",
607 name_ref_index, CHECK_(nullHandle));
608 }
609 }
610 }
611 }
612 break;
613 }
614 case JVM_CONSTANT_MethodHandle: {
615 int ref_index = cp->method_handle_index_at(index);
616 int ref_kind = cp->method_handle_ref_kind_at(index);
617 switch (ref_kind) {
618 case JVM_REF_invokeVirtual:
619 case JVM_REF_invokeStatic:
620 case JVM_REF_invokeSpecial:
621 case JVM_REF_newInvokeSpecial:
622 {
623 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
624 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
625 Symbol* name = cp->symbol_at(name_ref_index);
626 if (ref_kind == JVM_REF_newInvokeSpecial) {
627 if (name != vmSymbols::object_initializer_name()) {
628 classfile_parse_error(
629 "Bad constructor name at constant pool index %u in class file %s",
630 name_ref_index, CHECK_(nullHandle));
631 }
632 } else {
633 if (name == vmSymbols::object_initializer_name()) {
634 classfile_parse_error(
635 "Bad method name at constant pool index %u in class file %s",
636 name_ref_index, CHECK_(nullHandle));
637 }
638 }
639 }
640 break;
641 // Other ref_kinds are already fully checked in previous pass.
642 }
643 break;
644 }
645 case JVM_CONSTANT_MethodType: {
646 Symbol* no_name = vmSymbols::type_name(); // place holder
647 Symbol* signature = cp->method_type_signature_at(index);
648 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
649 break;
650 }
651 case JVM_CONSTANT_Utf8: {
652 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
653 }
654 } // end of switch
655 } // end of for
657 cp_in_error.set_in_error(false);
658 return cp;
659 }
662 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
663 assert(EnableInvokeDynamic, "");
664 BasicType patch_type = T_VOID;
665 switch (cp->tag_at(index).value()) {
667 case JVM_CONSTANT_UnresolvedClass :
668 // Patching a class means pre-resolving it.
669 // The name in the constant pool is ignored.
670 if (java_lang_Class::is_instance(patch())) {
671 guarantee_property(!java_lang_Class::is_primitive(patch()),
672 "Illegal class patch at %d in class file %s",
673 index, CHECK);
674 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
675 } else {
676 guarantee_property(java_lang_String::is_instance(patch()),
677 "Illegal class patch at %d in class file %s",
678 index, CHECK);
679 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
680 cp->unresolved_klass_at_put(index, name);
681 }
682 break;
684 case JVM_CONSTANT_UnresolvedString :
685 // Patching a string means pre-resolving it.
686 // The spelling in the constant pool is ignored.
687 // The constant reference may be any object whatever.
688 // If it is not a real interned string, the constant is referred
689 // to as a "pseudo-string", and must be presented to the CP
690 // explicitly, because it may require scavenging.
691 cp->pseudo_string_at_put(index, patch());
692 break;
694 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
695 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
696 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
697 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
698 patch_prim:
699 {
700 jvalue value;
701 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
702 guarantee_property(value_type == patch_type,
703 "Illegal primitive patch at %d in class file %s",
704 index, CHECK);
705 switch (value_type) {
706 case T_INT: cp->int_at_put(index, value.i); break;
707 case T_FLOAT: cp->float_at_put(index, value.f); break;
708 case T_LONG: cp->long_at_put(index, value.j); break;
709 case T_DOUBLE: cp->double_at_put(index, value.d); break;
710 default: assert(false, "");
711 }
712 }
713 break;
715 default:
716 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
717 guarantee_property(!has_cp_patch_at(index),
718 "Illegal unexpected patch at %d in class file %s",
719 index, CHECK);
720 return;
721 }
723 // On fall-through, mark the patch as used.
724 clear_cp_patch_at(index);
725 }
729 class NameSigHash: public ResourceObj {
730 public:
731 Symbol* _name; // name
732 Symbol* _sig; // signature
733 NameSigHash* _next; // Next entry in hash table
734 };
737 #define HASH_ROW_SIZE 256
739 unsigned int hash(Symbol* name, Symbol* sig) {
740 unsigned int raw_hash = 0;
741 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
742 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
744 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
745 }
748 void initialize_hashtable(NameSigHash** table) {
749 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
750 }
752 // Return false if the name/sig combination is found in table.
753 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
754 // The old format checker uses heap sort to find duplicates.
755 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
756 // of table since we don't expect Symbol*'s to move.
757 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
758 assert(name != NULL, "name in constant pool is NULL");
760 // First lookup for duplicates
761 int index = hash(name, sig);
762 NameSigHash* entry = table[index];
763 while (entry != NULL) {
764 if (entry->_name == name && entry->_sig == sig) {
765 return false;
766 }
767 entry = entry->_next;
768 }
770 // No duplicate is found, allocate a new entry and fill it.
771 entry = new NameSigHash();
772 entry->_name = name;
773 entry->_sig = sig;
775 // Insert into hash table
776 entry->_next = table[index];
777 table[index] = entry;
779 return true;
780 }
783 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
784 int length,
785 Handle class_loader,
786 Handle protection_domain,
787 Symbol* class_name,
788 TRAPS) {
789 ClassFileStream* cfs = stream();
790 assert(length > 0, "only called for length>0");
791 objArrayHandle nullHandle;
792 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
793 objArrayHandle interfaces (THREAD, interface_oop);
795 int index;
796 for (index = 0; index < length; index++) {
797 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
798 KlassHandle interf;
799 check_property(
800 valid_cp_range(interface_index, cp->length()) &&
801 is_klass_reference(cp, interface_index),
802 "Interface name has bad constant pool index %u in class file %s",
803 interface_index, CHECK_(nullHandle));
804 if (cp->tag_at(interface_index).is_klass()) {
805 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
806 } else {
807 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
809 // Don't need to check legal name because it's checked when parsing constant pool.
810 // But need to make sure it's not an array type.
811 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
812 "Bad interface name in class file %s", CHECK_(nullHandle));
814 // Call resolve_super so classcircularity is checked
815 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
816 unresolved_klass, class_loader, protection_domain,
817 false, CHECK_(nullHandle));
818 interf = KlassHandle(THREAD, k);
820 if (LinkWellKnownClasses) // my super type is well known to me
821 cp->klass_at_put(interface_index, interf()); // eagerly resolve
822 }
824 if (!Klass::cast(interf())->is_interface()) {
825 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
826 }
827 interfaces->obj_at_put(index, interf());
828 }
830 if (!_need_verify || length <= 1) {
831 return interfaces;
832 }
834 // Check if there's any duplicates in interfaces
835 ResourceMark rm(THREAD);
836 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
837 THREAD, NameSigHash*, HASH_ROW_SIZE);
838 initialize_hashtable(interface_names);
839 bool dup = false;
840 {
841 debug_only(No_Safepoint_Verifier nsv;)
842 for (index = 0; index < length; index++) {
843 klassOop k = (klassOop)interfaces->obj_at(index);
844 Symbol* name = instanceKlass::cast(k)->name();
845 // If no duplicates, add (name, NULL) in hashtable interface_names.
846 if (!put_after_lookup(name, NULL, interface_names)) {
847 dup = true;
848 break;
849 }
850 }
851 }
852 if (dup) {
853 classfile_parse_error("Duplicate interface name in class file %s",
854 CHECK_(nullHandle));
855 }
857 return interfaces;
858 }
861 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
862 // Make sure the constant pool entry is of a type appropriate to this field
863 guarantee_property(
864 (constantvalue_index > 0 &&
865 constantvalue_index < cp->length()),
866 "Bad initial value index %u in ConstantValue attribute in class file %s",
867 constantvalue_index, CHECK);
868 constantTag value_type = cp->tag_at(constantvalue_index);
869 switch ( cp->basic_type_for_signature_at(signature_index) ) {
870 case T_LONG:
871 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
872 break;
873 case T_FLOAT:
874 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
875 break;
876 case T_DOUBLE:
877 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
878 break;
879 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
880 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
881 break;
882 case T_OBJECT:
883 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
884 && (value_type.is_string() || value_type.is_unresolved_string())),
885 "Bad string initial value in class file %s", CHECK);
886 break;
887 default:
888 classfile_parse_error(
889 "Unable to set initial value %u in class file %s",
890 constantvalue_index, CHECK);
891 }
892 }
895 // Parse attributes for a field.
896 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
897 u2 attributes_count,
898 bool is_static, u2 signature_index,
899 u2* constantvalue_index_addr,
900 bool* is_synthetic_addr,
901 u2* generic_signature_index_addr,
902 typeArrayHandle* field_annotations,
903 TRAPS) {
904 ClassFileStream* cfs = stream();
905 assert(attributes_count > 0, "length should be greater than 0");
906 u2 constantvalue_index = 0;
907 u2 generic_signature_index = 0;
908 bool is_synthetic = false;
909 u1* runtime_visible_annotations = NULL;
910 int runtime_visible_annotations_length = 0;
911 u1* runtime_invisible_annotations = NULL;
912 int runtime_invisible_annotations_length = 0;
913 while (attributes_count--) {
914 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
915 u2 attribute_name_index = cfs->get_u2_fast();
916 u4 attribute_length = cfs->get_u4_fast();
917 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
918 cp->tag_at(attribute_name_index).is_utf8(),
919 "Invalid field attribute index %u in class file %s",
920 attribute_name_index,
921 CHECK);
922 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
923 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
924 // ignore if non-static
925 if (constantvalue_index != 0) {
926 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
927 }
928 check_property(
929 attribute_length == 2,
930 "Invalid ConstantValue field attribute length %u in class file %s",
931 attribute_length, CHECK);
932 constantvalue_index = cfs->get_u2(CHECK);
933 if (_need_verify) {
934 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
935 }
936 } else if (attribute_name == vmSymbols::tag_synthetic()) {
937 if (attribute_length != 0) {
938 classfile_parse_error(
939 "Invalid Synthetic field attribute length %u in class file %s",
940 attribute_length, CHECK);
941 }
942 is_synthetic = true;
943 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
944 if (attribute_length != 0) {
945 classfile_parse_error(
946 "Invalid Deprecated field attribute length %u in class file %s",
947 attribute_length, CHECK);
948 }
949 } else if (_major_version >= JAVA_1_5_VERSION) {
950 if (attribute_name == vmSymbols::tag_signature()) {
951 if (attribute_length != 2) {
952 classfile_parse_error(
953 "Wrong size %u for field's Signature attribute in class file %s",
954 attribute_length, CHECK);
955 }
956 generic_signature_index = cfs->get_u2(CHECK);
957 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
958 runtime_visible_annotations_length = attribute_length;
959 runtime_visible_annotations = cfs->get_u1_buffer();
960 assert(runtime_visible_annotations != NULL, "null visible annotations");
961 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
962 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
963 runtime_invisible_annotations_length = attribute_length;
964 runtime_invisible_annotations = cfs->get_u1_buffer();
965 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
966 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
967 } else {
968 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
969 }
970 } else {
971 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
972 }
973 }
975 *constantvalue_index_addr = constantvalue_index;
976 *is_synthetic_addr = is_synthetic;
977 *generic_signature_index_addr = generic_signature_index;
978 *field_annotations = assemble_annotations(runtime_visible_annotations,
979 runtime_visible_annotations_length,
980 runtime_invisible_annotations,
981 runtime_invisible_annotations_length,
982 CHECK);
983 return;
984 }
987 // Field allocation types. Used for computing field offsets.
989 enum FieldAllocationType {
990 STATIC_OOP, // Oops
991 STATIC_BYTE, // Boolean, Byte, char
992 STATIC_SHORT, // shorts
993 STATIC_WORD, // ints
994 STATIC_DOUBLE, // long or double
995 STATIC_ALIGNED_DOUBLE,// aligned long or double
996 NONSTATIC_OOP,
997 NONSTATIC_BYTE,
998 NONSTATIC_SHORT,
999 NONSTATIC_WORD,
1000 NONSTATIC_DOUBLE,
1001 NONSTATIC_ALIGNED_DOUBLE
1002 };
1005 struct FieldAllocationCount {
1006 unsigned int static_oop_count;
1007 unsigned int static_byte_count;
1008 unsigned int static_short_count;
1009 unsigned int static_word_count;
1010 unsigned int static_double_count;
1011 unsigned int nonstatic_oop_count;
1012 unsigned int nonstatic_byte_count;
1013 unsigned int nonstatic_short_count;
1014 unsigned int nonstatic_word_count;
1015 unsigned int nonstatic_double_count;
1016 };
1018 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
1019 struct FieldAllocationCount *fac,
1020 objArrayHandle* fields_annotations, TRAPS) {
1021 ClassFileStream* cfs = stream();
1022 typeArrayHandle nullHandle;
1023 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1024 u2 length = cfs->get_u2_fast();
1025 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1026 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1027 typeArrayHandle fields(THREAD, new_fields);
1029 int index = 0;
1030 typeArrayHandle field_annotations;
1031 for (int n = 0; n < length; n++) {
1032 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1034 AccessFlags access_flags;
1035 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1036 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1037 access_flags.set_flags(flags);
1039 u2 name_index = cfs->get_u2_fast();
1040 int cp_size = cp->length();
1041 check_property(
1042 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1043 "Invalid constant pool index %u for field name in class file %s",
1044 name_index, CHECK_(nullHandle));
1045 Symbol* name = cp->symbol_at(name_index);
1046 verify_legal_field_name(name, CHECK_(nullHandle));
1048 u2 signature_index = cfs->get_u2_fast();
1049 check_property(
1050 valid_cp_range(signature_index, cp_size) &&
1051 cp->tag_at(signature_index).is_utf8(),
1052 "Invalid constant pool index %u for field signature in class file %s",
1053 signature_index, CHECK_(nullHandle));
1054 Symbol* sig = cp->symbol_at(signature_index);
1055 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1057 u2 constantvalue_index = 0;
1058 bool is_synthetic = false;
1059 u2 generic_signature_index = 0;
1060 bool is_static = access_flags.is_static();
1062 u2 attributes_count = cfs->get_u2_fast();
1063 if (attributes_count > 0) {
1064 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1065 &constantvalue_index, &is_synthetic,
1066 &generic_signature_index, &field_annotations,
1067 CHECK_(nullHandle));
1068 if (field_annotations.not_null()) {
1069 if (fields_annotations->is_null()) {
1070 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1071 *fields_annotations = objArrayHandle(THREAD, md);
1072 }
1073 (*fields_annotations)->obj_at_put(n, field_annotations());
1074 }
1075 if (is_synthetic) {
1076 access_flags.set_is_synthetic();
1077 }
1078 }
1080 fields->short_at_put(index++, access_flags.as_short());
1081 fields->short_at_put(index++, name_index);
1082 fields->short_at_put(index++, signature_index);
1083 fields->short_at_put(index++, constantvalue_index);
1085 // Remember how many oops we encountered and compute allocation type
1086 BasicType type = cp->basic_type_for_signature_at(signature_index);
1087 FieldAllocationType atype;
1088 if ( is_static ) {
1089 switch ( type ) {
1090 case T_BOOLEAN:
1091 case T_BYTE:
1092 fac->static_byte_count++;
1093 atype = STATIC_BYTE;
1094 break;
1095 case T_LONG:
1096 case T_DOUBLE:
1097 if (Universe::field_type_should_be_aligned(type)) {
1098 atype = STATIC_ALIGNED_DOUBLE;
1099 } else {
1100 atype = STATIC_DOUBLE;
1101 }
1102 fac->static_double_count++;
1103 break;
1104 case T_CHAR:
1105 case T_SHORT:
1106 fac->static_short_count++;
1107 atype = STATIC_SHORT;
1108 break;
1109 case T_FLOAT:
1110 case T_INT:
1111 fac->static_word_count++;
1112 atype = STATIC_WORD;
1113 break;
1114 case T_ARRAY:
1115 case T_OBJECT:
1116 fac->static_oop_count++;
1117 atype = STATIC_OOP;
1118 break;
1119 case T_ADDRESS:
1120 case T_VOID:
1121 default:
1122 assert(0, "bad field type");
1123 }
1124 } else {
1125 switch ( type ) {
1126 case T_BOOLEAN:
1127 case T_BYTE:
1128 fac->nonstatic_byte_count++;
1129 atype = NONSTATIC_BYTE;
1130 break;
1131 case T_LONG:
1132 case T_DOUBLE:
1133 if (Universe::field_type_should_be_aligned(type)) {
1134 atype = NONSTATIC_ALIGNED_DOUBLE;
1135 } else {
1136 atype = NONSTATIC_DOUBLE;
1137 }
1138 fac->nonstatic_double_count++;
1139 break;
1140 case T_CHAR:
1141 case T_SHORT:
1142 fac->nonstatic_short_count++;
1143 atype = NONSTATIC_SHORT;
1144 break;
1145 case T_FLOAT:
1146 case T_INT:
1147 fac->nonstatic_word_count++;
1148 atype = NONSTATIC_WORD;
1149 break;
1150 case T_ARRAY:
1151 case T_OBJECT:
1152 fac->nonstatic_oop_count++;
1153 atype = NONSTATIC_OOP;
1154 break;
1155 case T_ADDRESS:
1156 case T_VOID:
1157 default:
1158 assert(0, "bad field type");
1159 }
1160 }
1162 // The correct offset is computed later (all oop fields will be located together)
1163 // We temporarily store the allocation type in the offset field
1164 fields->short_at_put(index++, atype);
1165 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1166 fields->short_at_put(index++, generic_signature_index);
1167 }
1169 if (_need_verify && length > 1) {
1170 // Check duplicated fields
1171 ResourceMark rm(THREAD);
1172 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1173 THREAD, NameSigHash*, HASH_ROW_SIZE);
1174 initialize_hashtable(names_and_sigs);
1175 bool dup = false;
1176 {
1177 debug_only(No_Safepoint_Verifier nsv;)
1178 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1179 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1180 Symbol* name = cp->symbol_at(name_index);
1181 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1182 Symbol* sig = cp->symbol_at(sig_index);
1183 // If no duplicates, add name/signature in hashtable names_and_sigs.
1184 if (!put_after_lookup(name, sig, names_and_sigs)) {
1185 dup = true;
1186 break;
1187 }
1188 }
1189 }
1190 if (dup) {
1191 classfile_parse_error("Duplicate field name&signature in class file %s",
1192 CHECK_(nullHandle));
1193 }
1194 }
1196 return fields;
1197 }
1200 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1201 while (length-- > 0) {
1202 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1203 }
1204 }
1207 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1208 u4 exception_table_length,
1209 constantPoolHandle cp,
1210 TRAPS) {
1211 ClassFileStream* cfs = stream();
1212 typeArrayHandle nullHandle;
1214 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1215 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1216 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1218 int index = 0;
1219 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1220 for (unsigned int i = 0; i < exception_table_length; i++) {
1221 u2 start_pc = cfs->get_u2_fast();
1222 u2 end_pc = cfs->get_u2_fast();
1223 u2 handler_pc = cfs->get_u2_fast();
1224 u2 catch_type_index = cfs->get_u2_fast();
1225 // Will check legal target after parsing code array in verifier.
1226 if (_need_verify) {
1227 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1228 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1229 guarantee_property(handler_pc < code_length,
1230 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1231 if (catch_type_index != 0) {
1232 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1233 is_klass_reference(cp, catch_type_index),
1234 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1235 }
1236 }
1237 exception_handlers->int_at_put(index++, start_pc);
1238 exception_handlers->int_at_put(index++, end_pc);
1239 exception_handlers->int_at_put(index++, handler_pc);
1240 exception_handlers->int_at_put(index++, catch_type_index);
1241 }
1242 return exception_handlers;
1243 }
1245 void ClassFileParser::parse_linenumber_table(
1246 u4 code_attribute_length, u4 code_length,
1247 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1248 ClassFileStream* cfs = stream();
1249 unsigned int num_entries = cfs->get_u2(CHECK);
1251 // Each entry is a u2 start_pc, and a u2 line_number
1252 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1254 // Verify line number attribute and table length
1255 check_property(
1256 code_attribute_length == sizeof(u2) + length_in_bytes,
1257 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1259 cfs->guarantee_more(length_in_bytes, CHECK);
1261 if ((*write_stream) == NULL) {
1262 if (length_in_bytes > fixed_buffer_size) {
1263 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1264 } else {
1265 (*write_stream) = new CompressedLineNumberWriteStream(
1266 linenumbertable_buffer, fixed_buffer_size);
1267 }
1268 }
1270 while (num_entries-- > 0) {
1271 u2 bci = cfs->get_u2_fast(); // start_pc
1272 u2 line = cfs->get_u2_fast(); // line_number
1273 guarantee_property(bci < code_length,
1274 "Invalid pc in LineNumberTable in class file %s", CHECK);
1275 (*write_stream)->write_pair(bci, line);
1276 }
1277 }
1280 // Class file LocalVariableTable elements.
1281 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1282 public:
1283 u2 start_bci;
1284 u2 length;
1285 u2 name_cp_index;
1286 u2 descriptor_cp_index;
1287 u2 slot;
1288 };
1291 class LVT_Hash: public CHeapObj {
1292 public:
1293 LocalVariableTableElement *_elem; // element
1294 LVT_Hash* _next; // Next entry in hash table
1295 };
1297 unsigned int hash(LocalVariableTableElement *elem) {
1298 unsigned int raw_hash = elem->start_bci;
1300 raw_hash = elem->length + raw_hash * 37;
1301 raw_hash = elem->name_cp_index + raw_hash * 37;
1302 raw_hash = elem->slot + raw_hash * 37;
1304 return raw_hash % HASH_ROW_SIZE;
1305 }
1307 void initialize_hashtable(LVT_Hash** table) {
1308 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1309 table[i] = NULL;
1310 }
1311 }
1313 void clear_hashtable(LVT_Hash** table) {
1314 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1315 LVT_Hash* current = table[i];
1316 LVT_Hash* next;
1317 while (current != NULL) {
1318 next = current->_next;
1319 current->_next = NULL;
1320 delete(current);
1321 current = next;
1322 }
1323 table[i] = NULL;
1324 }
1325 }
1327 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1328 LVT_Hash* entry = table[index];
1330 /*
1331 * 3-tuple start_bci/length/slot has to be unique key,
1332 * so the following comparison seems to be redundant:
1333 * && elem->name_cp_index == entry->_elem->name_cp_index
1334 */
1335 while (entry != NULL) {
1336 if (elem->start_bci == entry->_elem->start_bci
1337 && elem->length == entry->_elem->length
1338 && elem->name_cp_index == entry->_elem->name_cp_index
1339 && elem->slot == entry->_elem->slot
1340 ) {
1341 return entry;
1342 }
1343 entry = entry->_next;
1344 }
1345 return NULL;
1346 }
1348 // Return false if the local variable is found in table.
1349 // Return true if no duplicate is found.
1350 // And local variable is added as a new entry in table.
1351 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1352 // First lookup for duplicates
1353 int index = hash(elem);
1354 LVT_Hash* entry = LVT_lookup(elem, index, table);
1356 if (entry != NULL) {
1357 return false;
1358 }
1359 // No duplicate is found, allocate a new entry and fill it.
1360 if ((entry = new LVT_Hash()) == NULL) {
1361 return false;
1362 }
1363 entry->_elem = elem;
1365 // Insert into hash table
1366 entry->_next = table[index];
1367 table[index] = entry;
1369 return true;
1370 }
1372 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1373 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1374 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1375 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1376 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1377 lvt->signature_cp_index = 0;
1378 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1379 }
1381 // Function is used to parse both attributes:
1382 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1383 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1384 u2 max_locals,
1385 u4 code_attribute_length,
1386 constantPoolHandle cp,
1387 u2* localvariable_table_length,
1388 bool isLVTT,
1389 TRAPS) {
1390 ClassFileStream* cfs = stream();
1391 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1392 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1393 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1394 // Verify local variable table attribute has right length
1395 if (_need_verify) {
1396 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1397 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1398 }
1399 u2* localvariable_table_start = cfs->get_u2_buffer();
1400 assert(localvariable_table_start != NULL, "null local variable table");
1401 if (!_need_verify) {
1402 cfs->skip_u2_fast(size);
1403 } else {
1404 cfs->guarantee_more(size * 2, CHECK_NULL);
1405 for(int i = 0; i < (*localvariable_table_length); i++) {
1406 u2 start_pc = cfs->get_u2_fast();
1407 u2 length = cfs->get_u2_fast();
1408 u2 name_index = cfs->get_u2_fast();
1409 u2 descriptor_index = cfs->get_u2_fast();
1410 u2 index = cfs->get_u2_fast();
1411 // Assign to a u4 to avoid overflow
1412 u4 end_pc = (u4)start_pc + (u4)length;
1414 if (start_pc >= code_length) {
1415 classfile_parse_error(
1416 "Invalid start_pc %u in %s in class file %s",
1417 start_pc, tbl_name, CHECK_NULL);
1418 }
1419 if (end_pc > code_length) {
1420 classfile_parse_error(
1421 "Invalid length %u in %s in class file %s",
1422 length, tbl_name, CHECK_NULL);
1423 }
1424 int cp_size = cp->length();
1425 guarantee_property(
1426 valid_cp_range(name_index, cp_size) &&
1427 cp->tag_at(name_index).is_utf8(),
1428 "Name index %u in %s has bad constant type in class file %s",
1429 name_index, tbl_name, CHECK_NULL);
1430 guarantee_property(
1431 valid_cp_range(descriptor_index, cp_size) &&
1432 cp->tag_at(descriptor_index).is_utf8(),
1433 "Signature index %u in %s has bad constant type in class file %s",
1434 descriptor_index, tbl_name, CHECK_NULL);
1436 Symbol* name = cp->symbol_at(name_index);
1437 Symbol* sig = cp->symbol_at(descriptor_index);
1438 verify_legal_field_name(name, CHECK_NULL);
1439 u2 extra_slot = 0;
1440 if (!isLVTT) {
1441 verify_legal_field_signature(name, sig, CHECK_NULL);
1443 // 4894874: check special cases for double and long local variables
1444 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1445 sig == vmSymbols::type_signature(T_LONG)) {
1446 extra_slot = 1;
1447 }
1448 }
1449 guarantee_property((index + extra_slot) < max_locals,
1450 "Invalid index %u in %s in class file %s",
1451 index, tbl_name, CHECK_NULL);
1452 }
1453 }
1454 return localvariable_table_start;
1455 }
1458 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1459 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1460 ClassFileStream* cfs = stream();
1461 u2 index = 0; // index in the array with long/double occupying two slots
1462 u4 i1 = *u1_index;
1463 u4 i2 = *u2_index + 1;
1464 for(int i = 0; i < array_length; i++) {
1465 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1466 index++;
1467 if (tag == ITEM_Long || tag == ITEM_Double) {
1468 index++;
1469 } else if (tag == ITEM_Object) {
1470 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1471 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1472 is_klass_reference(cp, class_index),
1473 "Bad class index %u in StackMap in class file %s",
1474 class_index, CHECK);
1475 } else if (tag == ITEM_Uninitialized) {
1476 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1477 guarantee_property(
1478 offset < code_length,
1479 "Bad uninitialized type offset %u in StackMap in class file %s",
1480 offset, CHECK);
1481 } else {
1482 guarantee_property(
1483 tag <= (u1)ITEM_Uninitialized,
1484 "Unknown variable type %u in StackMap in class file %s",
1485 tag, CHECK);
1486 }
1487 }
1488 u2_array[*u2_index] = index;
1489 *u1_index = i1;
1490 *u2_index = i2;
1491 }
1493 typeArrayOop ClassFileParser::parse_stackmap_table(
1494 u4 code_attribute_length, TRAPS) {
1495 if (code_attribute_length == 0)
1496 return NULL;
1498 ClassFileStream* cfs = stream();
1499 u1* stackmap_table_start = cfs->get_u1_buffer();
1500 assert(stackmap_table_start != NULL, "null stackmap table");
1502 // check code_attribute_length first
1503 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1505 if (!_need_verify && !DumpSharedSpaces) {
1506 return NULL;
1507 }
1509 typeArrayOop stackmap_data =
1510 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1512 stackmap_data->set_length(code_attribute_length);
1513 memcpy((void*)stackmap_data->byte_at_addr(0),
1514 (void*)stackmap_table_start, code_attribute_length);
1515 return stackmap_data;
1516 }
1518 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1519 u4 method_attribute_length,
1520 constantPoolHandle cp, TRAPS) {
1521 ClassFileStream* cfs = stream();
1522 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1523 *checked_exceptions_length = cfs->get_u2_fast();
1524 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1525 u2* checked_exceptions_start = cfs->get_u2_buffer();
1526 assert(checked_exceptions_start != NULL, "null checked exceptions");
1527 if (!_need_verify) {
1528 cfs->skip_u2_fast(size);
1529 } else {
1530 // Verify each value in the checked exception table
1531 u2 checked_exception;
1532 u2 len = *checked_exceptions_length;
1533 cfs->guarantee_more(2 * len, CHECK_NULL);
1534 for (int i = 0; i < len; i++) {
1535 checked_exception = cfs->get_u2_fast();
1536 check_property(
1537 valid_cp_range(checked_exception, cp->length()) &&
1538 is_klass_reference(cp, checked_exception),
1539 "Exception name has bad type at constant pool %u in class file %s",
1540 checked_exception, CHECK_NULL);
1541 }
1542 }
1543 // check exceptions attribute length
1544 if (_need_verify) {
1545 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1546 sizeof(u2) * size),
1547 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1548 }
1549 return checked_exceptions_start;
1550 }
1552 void ClassFileParser::throwIllegalSignature(
1553 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1554 ResourceMark rm(THREAD);
1555 Exceptions::fthrow(THREAD_AND_LOCATION,
1556 vmSymbols::java_lang_ClassFormatError(),
1557 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1558 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1559 }
1561 #define MAX_ARGS_SIZE 255
1562 #define MAX_CODE_SIZE 65535
1563 #define INITIAL_MAX_LVT_NUMBER 256
1565 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1566 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1567 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1568 // entire method attribute is parsed.
1569 //
1570 // The promoted_flags parameter is used to pass relevant access_flags
1571 // from the method back up to the containing klass. These flag values
1572 // are added to klass's access_flags.
1574 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1575 AccessFlags *promoted_flags,
1576 typeArrayHandle* method_annotations,
1577 typeArrayHandle* method_parameter_annotations,
1578 typeArrayHandle* method_default_annotations,
1579 TRAPS) {
1580 ClassFileStream* cfs = stream();
1581 methodHandle nullHandle;
1582 ResourceMark rm(THREAD);
1583 // Parse fixed parts
1584 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1586 int flags = cfs->get_u2_fast();
1587 u2 name_index = cfs->get_u2_fast();
1588 int cp_size = cp->length();
1589 check_property(
1590 valid_cp_range(name_index, cp_size) &&
1591 cp->tag_at(name_index).is_utf8(),
1592 "Illegal constant pool index %u for method name in class file %s",
1593 name_index, CHECK_(nullHandle));
1594 Symbol* name = cp->symbol_at(name_index);
1595 verify_legal_method_name(name, CHECK_(nullHandle));
1597 u2 signature_index = cfs->get_u2_fast();
1598 guarantee_property(
1599 valid_cp_range(signature_index, cp_size) &&
1600 cp->tag_at(signature_index).is_utf8(),
1601 "Illegal constant pool index %u for method signature in class file %s",
1602 signature_index, CHECK_(nullHandle));
1603 Symbol* signature = cp->symbol_at(signature_index);
1605 AccessFlags access_flags;
1606 if (name == vmSymbols::class_initializer_name()) {
1607 // We ignore the other access flags for a valid class initializer.
1608 // (JVM Spec 2nd ed., chapter 4.6)
1609 if (_major_version < 51) { // backward compatibility
1610 flags = JVM_ACC_STATIC;
1611 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1612 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1613 }
1614 } else {
1615 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1616 }
1618 int args_size = -1; // only used when _need_verify is true
1619 if (_need_verify) {
1620 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1621 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1622 if (args_size > MAX_ARGS_SIZE) {
1623 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1624 }
1625 }
1627 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1629 // Default values for code and exceptions attribute elements
1630 u2 max_stack = 0;
1631 u2 max_locals = 0;
1632 u4 code_length = 0;
1633 u1* code_start = 0;
1634 u2 exception_table_length = 0;
1635 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1636 u2 checked_exceptions_length = 0;
1637 u2* checked_exceptions_start = NULL;
1638 CompressedLineNumberWriteStream* linenumber_table = NULL;
1639 int linenumber_table_length = 0;
1640 int total_lvt_length = 0;
1641 u2 lvt_cnt = 0;
1642 u2 lvtt_cnt = 0;
1643 bool lvt_allocated = false;
1644 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1645 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1646 u2* localvariable_table_length;
1647 u2** localvariable_table_start;
1648 u2* localvariable_type_table_length;
1649 u2** localvariable_type_table_start;
1650 bool parsed_code_attribute = false;
1651 bool parsed_checked_exceptions_attribute = false;
1652 bool parsed_stackmap_attribute = false;
1653 // stackmap attribute - JDK1.5
1654 typeArrayHandle stackmap_data;
1655 u2 generic_signature_index = 0;
1656 u1* runtime_visible_annotations = NULL;
1657 int runtime_visible_annotations_length = 0;
1658 u1* runtime_invisible_annotations = NULL;
1659 int runtime_invisible_annotations_length = 0;
1660 u1* runtime_visible_parameter_annotations = NULL;
1661 int runtime_visible_parameter_annotations_length = 0;
1662 u1* runtime_invisible_parameter_annotations = NULL;
1663 int runtime_invisible_parameter_annotations_length = 0;
1664 u1* annotation_default = NULL;
1665 int annotation_default_length = 0;
1667 // Parse code and exceptions attribute
1668 u2 method_attributes_count = cfs->get_u2_fast();
1669 while (method_attributes_count--) {
1670 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1671 u2 method_attribute_name_index = cfs->get_u2_fast();
1672 u4 method_attribute_length = cfs->get_u4_fast();
1673 check_property(
1674 valid_cp_range(method_attribute_name_index, cp_size) &&
1675 cp->tag_at(method_attribute_name_index).is_utf8(),
1676 "Invalid method attribute name index %u in class file %s",
1677 method_attribute_name_index, CHECK_(nullHandle));
1679 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1680 if (method_attribute_name == vmSymbols::tag_code()) {
1681 // Parse Code attribute
1682 if (_need_verify) {
1683 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1684 "Code attribute in native or abstract methods in class file %s",
1685 CHECK_(nullHandle));
1686 }
1687 if (parsed_code_attribute) {
1688 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1689 }
1690 parsed_code_attribute = true;
1692 // Stack size, locals size, and code size
1693 if (_major_version == 45 && _minor_version <= 2) {
1694 cfs->guarantee_more(4, CHECK_(nullHandle));
1695 max_stack = cfs->get_u1_fast();
1696 max_locals = cfs->get_u1_fast();
1697 code_length = cfs->get_u2_fast();
1698 } else {
1699 cfs->guarantee_more(8, CHECK_(nullHandle));
1700 max_stack = cfs->get_u2_fast();
1701 max_locals = cfs->get_u2_fast();
1702 code_length = cfs->get_u4_fast();
1703 }
1704 if (_need_verify) {
1705 guarantee_property(args_size <= max_locals,
1706 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1707 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1708 "Invalid method Code length %u in class file %s",
1709 code_length, CHECK_(nullHandle));
1710 }
1711 // Code pointer
1712 code_start = cfs->get_u1_buffer();
1713 assert(code_start != NULL, "null code start");
1714 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1715 cfs->skip_u1_fast(code_length);
1717 // Exception handler table
1718 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1719 exception_table_length = cfs->get_u2_fast();
1720 if (exception_table_length > 0) {
1721 exception_handlers =
1722 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1723 }
1725 // Parse additional attributes in code attribute
1726 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1727 u2 code_attributes_count = cfs->get_u2_fast();
1729 unsigned int calculated_attribute_length = 0;
1731 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1732 calculated_attribute_length =
1733 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1734 } else {
1735 // max_stack, locals and length are smaller in pre-version 45.2 classes
1736 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1737 }
1738 calculated_attribute_length +=
1739 code_length +
1740 sizeof(exception_table_length) +
1741 sizeof(code_attributes_count) +
1742 exception_table_length *
1743 ( sizeof(u2) + // start_pc
1744 sizeof(u2) + // end_pc
1745 sizeof(u2) + // handler_pc
1746 sizeof(u2) ); // catch_type_index
1748 while (code_attributes_count--) {
1749 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1750 u2 code_attribute_name_index = cfs->get_u2_fast();
1751 u4 code_attribute_length = cfs->get_u4_fast();
1752 calculated_attribute_length += code_attribute_length +
1753 sizeof(code_attribute_name_index) +
1754 sizeof(code_attribute_length);
1755 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1756 cp->tag_at(code_attribute_name_index).is_utf8(),
1757 "Invalid code attribute name index %u in class file %s",
1758 code_attribute_name_index,
1759 CHECK_(nullHandle));
1760 if (LoadLineNumberTables &&
1761 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1762 // Parse and compress line number table
1763 parse_linenumber_table(code_attribute_length, code_length,
1764 &linenumber_table, CHECK_(nullHandle));
1766 } else if (LoadLocalVariableTables &&
1767 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1768 // Parse local variable table
1769 if (!lvt_allocated) {
1770 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1771 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1772 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1773 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1774 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1775 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1776 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1777 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1778 lvt_allocated = true;
1779 }
1780 if (lvt_cnt == max_lvt_cnt) {
1781 max_lvt_cnt <<= 1;
1782 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1783 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1784 }
1785 localvariable_table_start[lvt_cnt] =
1786 parse_localvariable_table(code_length,
1787 max_locals,
1788 code_attribute_length,
1789 cp,
1790 &localvariable_table_length[lvt_cnt],
1791 false, // is not LVTT
1792 CHECK_(nullHandle));
1793 total_lvt_length += localvariable_table_length[lvt_cnt];
1794 lvt_cnt++;
1795 } else if (LoadLocalVariableTypeTables &&
1796 _major_version >= JAVA_1_5_VERSION &&
1797 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1798 if (!lvt_allocated) {
1799 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1800 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1801 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1802 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1803 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1804 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1805 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1806 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1807 lvt_allocated = true;
1808 }
1809 // Parse local variable type table
1810 if (lvtt_cnt == max_lvtt_cnt) {
1811 max_lvtt_cnt <<= 1;
1812 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1813 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1814 }
1815 localvariable_type_table_start[lvtt_cnt] =
1816 parse_localvariable_table(code_length,
1817 max_locals,
1818 code_attribute_length,
1819 cp,
1820 &localvariable_type_table_length[lvtt_cnt],
1821 true, // is LVTT
1822 CHECK_(nullHandle));
1823 lvtt_cnt++;
1824 } else if (UseSplitVerifier &&
1825 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1826 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1827 // Stack map is only needed by the new verifier in JDK1.5.
1828 if (parsed_stackmap_attribute) {
1829 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1830 }
1831 typeArrayOop sm =
1832 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1833 stackmap_data = typeArrayHandle(THREAD, sm);
1834 parsed_stackmap_attribute = true;
1835 } else {
1836 // Skip unknown attributes
1837 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1838 }
1839 }
1840 // check method attribute length
1841 if (_need_verify) {
1842 guarantee_property(method_attribute_length == calculated_attribute_length,
1843 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1844 }
1845 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1846 // Parse Exceptions attribute
1847 if (parsed_checked_exceptions_attribute) {
1848 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1849 }
1850 parsed_checked_exceptions_attribute = true;
1851 checked_exceptions_start =
1852 parse_checked_exceptions(&checked_exceptions_length,
1853 method_attribute_length,
1854 cp, CHECK_(nullHandle));
1855 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1856 if (method_attribute_length != 0) {
1857 classfile_parse_error(
1858 "Invalid Synthetic method attribute length %u in class file %s",
1859 method_attribute_length, CHECK_(nullHandle));
1860 }
1861 // Should we check that there hasn't already been a synthetic attribute?
1862 access_flags.set_is_synthetic();
1863 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1864 if (method_attribute_length != 0) {
1865 classfile_parse_error(
1866 "Invalid Deprecated method attribute length %u in class file %s",
1867 method_attribute_length, CHECK_(nullHandle));
1868 }
1869 } else if (_major_version >= JAVA_1_5_VERSION) {
1870 if (method_attribute_name == vmSymbols::tag_signature()) {
1871 if (method_attribute_length != 2) {
1872 classfile_parse_error(
1873 "Invalid Signature attribute length %u in class file %s",
1874 method_attribute_length, CHECK_(nullHandle));
1875 }
1876 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1877 generic_signature_index = cfs->get_u2_fast();
1878 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1879 runtime_visible_annotations_length = method_attribute_length;
1880 runtime_visible_annotations = cfs->get_u1_buffer();
1881 assert(runtime_visible_annotations != NULL, "null visible annotations");
1882 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1883 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1884 runtime_invisible_annotations_length = method_attribute_length;
1885 runtime_invisible_annotations = cfs->get_u1_buffer();
1886 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1887 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1888 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1889 runtime_visible_parameter_annotations_length = method_attribute_length;
1890 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1891 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1892 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1893 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1894 runtime_invisible_parameter_annotations_length = method_attribute_length;
1895 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1896 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1897 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1898 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1899 annotation_default_length = method_attribute_length;
1900 annotation_default = cfs->get_u1_buffer();
1901 assert(annotation_default != NULL, "null annotation default");
1902 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1903 } else {
1904 // Skip unknown attributes
1905 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1906 }
1907 } else {
1908 // Skip unknown attributes
1909 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1910 }
1911 }
1913 if (linenumber_table != NULL) {
1914 linenumber_table->write_terminator();
1915 linenumber_table_length = linenumber_table->position();
1916 }
1918 // Make sure there's at least one Code attribute in non-native/non-abstract method
1919 if (_need_verify) {
1920 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1921 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1922 }
1924 // All sizing information for a methodOop is finally available, now create it
1925 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1926 total_lvt_length, checked_exceptions_length,
1927 oopDesc::IsSafeConc, CHECK_(nullHandle));
1928 methodHandle m (THREAD, m_oop);
1930 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1932 // Fill in information from fixed part (access_flags already set)
1933 m->set_constants(cp());
1934 m->set_name_index(name_index);
1935 m->set_signature_index(signature_index);
1936 m->set_generic_signature_index(generic_signature_index);
1937 #ifdef CC_INTERP
1938 // hmm is there a gc issue here??
1939 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1940 m->set_result_index(rtf.type());
1941 #endif
1943 if (args_size >= 0) {
1944 m->set_size_of_parameters(args_size);
1945 } else {
1946 m->compute_size_of_parameters(THREAD);
1947 }
1948 #ifdef ASSERT
1949 if (args_size >= 0) {
1950 m->compute_size_of_parameters(THREAD);
1951 assert(args_size == m->size_of_parameters(), "");
1952 }
1953 #endif
1955 // Fill in code attribute information
1956 m->set_max_stack(max_stack);
1957 m->set_max_locals(max_locals);
1958 m->constMethod()->set_stackmap_data(stackmap_data());
1960 /**
1961 * The exception_table field is the flag used to indicate
1962 * that the methodOop and it's associated constMethodOop are partially
1963 * initialized and thus are exempt from pre/post GC verification. Once
1964 * the field is set, the oops are considered fully initialized so make
1965 * sure that the oops can pass verification when this field is set.
1966 */
1967 m->set_exception_table(exception_handlers());
1969 // Copy byte codes
1970 m->set_code(code_start);
1972 // Copy line number table
1973 if (linenumber_table != NULL) {
1974 memcpy(m->compressed_linenumber_table(),
1975 linenumber_table->buffer(), linenumber_table_length);
1976 }
1978 // Copy checked exceptions
1979 if (checked_exceptions_length > 0) {
1980 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1981 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1982 }
1984 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1985 *
1986 * Rules for LVT's and LVTT's are:
1987 * - There can be any number of LVT's and LVTT's.
1988 * - If there are n LVT's, it is the same as if there was just
1989 * one LVT containing all the entries from the n LVT's.
1990 * - There may be no more than one LVT entry per local variable.
1991 * Two LVT entries are 'equal' if these fields are the same:
1992 * start_pc, length, name, slot
1993 * - There may be no more than one LVTT entry per each LVT entry.
1994 * Each LVTT entry has to match some LVT entry.
1995 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1996 */
1997 if (total_lvt_length > 0) {
1998 int tbl_no, idx;
2000 promoted_flags->set_has_localvariable_table();
2002 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2003 initialize_hashtable(lvt_Hash);
2005 // To fill LocalVariableTable in
2006 Classfile_LVT_Element* cf_lvt;
2007 LocalVariableTableElement* lvt = m->localvariable_table_start();
2009 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2010 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2011 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2012 copy_lvt_element(&cf_lvt[idx], lvt);
2013 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2014 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2015 && _need_verify
2016 && _major_version >= JAVA_1_5_VERSION ) {
2017 clear_hashtable(lvt_Hash);
2018 classfile_parse_error("Duplicated LocalVariableTable attribute "
2019 "entry for '%s' in class file %s",
2020 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2021 CHECK_(nullHandle));
2022 }
2023 }
2024 }
2026 // To merge LocalVariableTable and LocalVariableTypeTable
2027 Classfile_LVT_Element* cf_lvtt;
2028 LocalVariableTableElement lvtt_elem;
2030 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2031 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2032 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2033 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2034 int index = hash(&lvtt_elem);
2035 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2036 if (entry == NULL) {
2037 if (_need_verify) {
2038 clear_hashtable(lvt_Hash);
2039 classfile_parse_error("LVTT entry for '%s' in class file %s "
2040 "does not match any LVT entry",
2041 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2042 CHECK_(nullHandle));
2043 }
2044 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2045 clear_hashtable(lvt_Hash);
2046 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2047 "entry for '%s' in class file %s",
2048 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2049 CHECK_(nullHandle));
2050 } else {
2051 // to add generic signatures into LocalVariableTable
2052 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2053 }
2054 }
2055 }
2056 clear_hashtable(lvt_Hash);
2057 }
2059 *method_annotations = assemble_annotations(runtime_visible_annotations,
2060 runtime_visible_annotations_length,
2061 runtime_invisible_annotations,
2062 runtime_invisible_annotations_length,
2063 CHECK_(nullHandle));
2064 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2065 runtime_visible_parameter_annotations_length,
2066 runtime_invisible_parameter_annotations,
2067 runtime_invisible_parameter_annotations_length,
2068 CHECK_(nullHandle));
2069 *method_default_annotations = assemble_annotations(annotation_default,
2070 annotation_default_length,
2071 NULL,
2072 0,
2073 CHECK_(nullHandle));
2075 if (name == vmSymbols::finalize_method_name() &&
2076 signature == vmSymbols::void_method_signature()) {
2077 if (m->is_empty_method()) {
2078 _has_empty_finalizer = true;
2079 } else {
2080 _has_finalizer = true;
2081 }
2082 }
2083 if (name == vmSymbols::object_initializer_name() &&
2084 signature == vmSymbols::void_method_signature() &&
2085 m->is_vanilla_constructor()) {
2086 _has_vanilla_constructor = true;
2087 }
2089 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2090 m->is_method_handle_adapter())) {
2091 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2092 "Method handle invokers must be defined internally to the VM", nullHandle);
2093 }
2095 return m;
2096 }
2099 // The promoted_flags parameter is used to pass relevant access_flags
2100 // from the methods back up to the containing klass. These flag values
2101 // are added to klass's access_flags.
2103 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2104 AccessFlags* promoted_flags,
2105 bool* has_final_method,
2106 objArrayOop* methods_annotations_oop,
2107 objArrayOop* methods_parameter_annotations_oop,
2108 objArrayOop* methods_default_annotations_oop,
2109 TRAPS) {
2110 ClassFileStream* cfs = stream();
2111 objArrayHandle nullHandle;
2112 typeArrayHandle method_annotations;
2113 typeArrayHandle method_parameter_annotations;
2114 typeArrayHandle method_default_annotations;
2115 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2116 u2 length = cfs->get_u2_fast();
2117 if (length == 0) {
2118 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2119 } else {
2120 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2121 objArrayHandle methods(THREAD, m);
2122 HandleMark hm(THREAD);
2123 objArrayHandle methods_annotations;
2124 objArrayHandle methods_parameter_annotations;
2125 objArrayHandle methods_default_annotations;
2126 for (int index = 0; index < length; index++) {
2127 methodHandle method = parse_method(cp, is_interface,
2128 promoted_flags,
2129 &method_annotations,
2130 &method_parameter_annotations,
2131 &method_default_annotations,
2132 CHECK_(nullHandle));
2133 if (method->is_final()) {
2134 *has_final_method = true;
2135 }
2136 methods->obj_at_put(index, method());
2137 if (method_annotations.not_null()) {
2138 if (methods_annotations.is_null()) {
2139 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2140 methods_annotations = objArrayHandle(THREAD, md);
2141 }
2142 methods_annotations->obj_at_put(index, method_annotations());
2143 }
2144 if (method_parameter_annotations.not_null()) {
2145 if (methods_parameter_annotations.is_null()) {
2146 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2147 methods_parameter_annotations = objArrayHandle(THREAD, md);
2148 }
2149 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2150 }
2151 if (method_default_annotations.not_null()) {
2152 if (methods_default_annotations.is_null()) {
2153 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2154 methods_default_annotations = objArrayHandle(THREAD, md);
2155 }
2156 methods_default_annotations->obj_at_put(index, method_default_annotations());
2157 }
2158 }
2159 if (_need_verify && length > 1) {
2160 // Check duplicated methods
2161 ResourceMark rm(THREAD);
2162 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2163 THREAD, NameSigHash*, HASH_ROW_SIZE);
2164 initialize_hashtable(names_and_sigs);
2165 bool dup = false;
2166 {
2167 debug_only(No_Safepoint_Verifier nsv;)
2168 for (int i = 0; i < length; i++) {
2169 methodOop m = (methodOop)methods->obj_at(i);
2170 // If no duplicates, add name/signature in hashtable names_and_sigs.
2171 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2172 dup = true;
2173 break;
2174 }
2175 }
2176 }
2177 if (dup) {
2178 classfile_parse_error("Duplicate method name&signature in class file %s",
2179 CHECK_(nullHandle));
2180 }
2181 }
2183 *methods_annotations_oop = methods_annotations();
2184 *methods_parameter_annotations_oop = methods_parameter_annotations();
2185 *methods_default_annotations_oop = methods_default_annotations();
2187 return methods;
2188 }
2189 }
2192 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2193 objArrayHandle methods_annotations,
2194 objArrayHandle methods_parameter_annotations,
2195 objArrayHandle methods_default_annotations,
2196 TRAPS) {
2197 typeArrayHandle nullHandle;
2198 int length = methods()->length();
2199 // If JVMTI original method ordering or sharing is enabled we have to
2200 // remember the original class file ordering.
2201 // We temporarily use the vtable_index field in the methodOop to store the
2202 // class file index, so we can read in after calling qsort.
2203 // Put the method ordering in the shared archive.
2204 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2205 for (int index = 0; index < length; index++) {
2206 methodOop m = methodOop(methods->obj_at(index));
2207 assert(!m->valid_vtable_index(), "vtable index should not be set");
2208 m->set_vtable_index(index);
2209 }
2210 }
2211 // Sort method array by ascending method name (for faster lookups & vtable construction)
2212 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2213 methodOopDesc::sort_methods(methods(),
2214 methods_annotations(),
2215 methods_parameter_annotations(),
2216 methods_default_annotations());
2218 // If JVMTI original method ordering or sharing is enabled construct int
2219 // array remembering the original ordering
2220 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2221 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2222 typeArrayHandle method_ordering(THREAD, new_ordering);
2223 for (int index = 0; index < length; index++) {
2224 methodOop m = methodOop(methods->obj_at(index));
2225 int old_index = m->vtable_index();
2226 assert(old_index >= 0 && old_index < length, "invalid method index");
2227 method_ordering->int_at_put(index, old_index);
2228 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2229 }
2230 return method_ordering;
2231 } else {
2232 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2233 }
2234 }
2237 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2238 ClassFileStream* cfs = stream();
2239 cfs->guarantee_more(2, CHECK); // sourcefile_index
2240 u2 sourcefile_index = cfs->get_u2_fast();
2241 check_property(
2242 valid_cp_range(sourcefile_index, cp->length()) &&
2243 cp->tag_at(sourcefile_index).is_utf8(),
2244 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2245 sourcefile_index, CHECK);
2246 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2247 }
2251 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2252 instanceKlassHandle k,
2253 int length, TRAPS) {
2254 ClassFileStream* cfs = stream();
2255 u1* sde_buffer = cfs->get_u1_buffer();
2256 assert(sde_buffer != NULL, "null sde buffer");
2258 // Don't bother storing it if there is no way to retrieve it
2259 if (JvmtiExport::can_get_source_debug_extension()) {
2260 // Optimistically assume that only 1 byte UTF format is used
2261 // (common case)
2262 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2263 k->set_source_debug_extension(sde_symbol);
2264 // Note that set_source_debug_extension() increments the reference count
2265 // for its copy of the Symbol*, so use a TempNewSymbol here.
2266 }
2267 // Got utf8 string, set stream position forward
2268 cfs->skip_u1(length, CHECK);
2269 }
2272 // Inner classes can be static, private or protected (classic VM does this)
2273 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2275 // Return number of classes in the inner classes attribute table
2276 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2277 ClassFileStream* cfs = stream();
2278 cfs->guarantee_more(2, CHECK_0); // length
2279 u2 length = cfs->get_u2_fast();
2281 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2282 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2283 typeArrayHandle inner_classes(THREAD, ic);
2284 int index = 0;
2285 int cp_size = cp->length();
2286 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2287 for (int n = 0; n < length; n++) {
2288 // Inner class index
2289 u2 inner_class_info_index = cfs->get_u2_fast();
2290 check_property(
2291 inner_class_info_index == 0 ||
2292 (valid_cp_range(inner_class_info_index, cp_size) &&
2293 is_klass_reference(cp, inner_class_info_index)),
2294 "inner_class_info_index %u has bad constant type in class file %s",
2295 inner_class_info_index, CHECK_0);
2296 // Outer class index
2297 u2 outer_class_info_index = cfs->get_u2_fast();
2298 check_property(
2299 outer_class_info_index == 0 ||
2300 (valid_cp_range(outer_class_info_index, cp_size) &&
2301 is_klass_reference(cp, outer_class_info_index)),
2302 "outer_class_info_index %u has bad constant type in class file %s",
2303 outer_class_info_index, CHECK_0);
2304 // Inner class name
2305 u2 inner_name_index = cfs->get_u2_fast();
2306 check_property(
2307 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2308 cp->tag_at(inner_name_index).is_utf8()),
2309 "inner_name_index %u has bad constant type in class file %s",
2310 inner_name_index, CHECK_0);
2311 if (_need_verify) {
2312 guarantee_property(inner_class_info_index != outer_class_info_index,
2313 "Class is both outer and inner class in class file %s", CHECK_0);
2314 }
2315 // Access flags
2316 AccessFlags inner_access_flags;
2317 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2318 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2319 // Set abstract bit for old class files for backward compatibility
2320 flags |= JVM_ACC_ABSTRACT;
2321 }
2322 verify_legal_class_modifiers(flags, CHECK_0);
2323 inner_access_flags.set_flags(flags);
2325 inner_classes->short_at_put(index++, inner_class_info_index);
2326 inner_classes->short_at_put(index++, outer_class_info_index);
2327 inner_classes->short_at_put(index++, inner_name_index);
2328 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2329 }
2331 // 4347400: make sure there's no duplicate entry in the classes array
2332 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2333 for(int i = 0; i < inner_classes->length(); i += 4) {
2334 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2335 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2336 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2337 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2338 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2339 "Duplicate entry in InnerClasses in class file %s",
2340 CHECK_0);
2341 }
2342 }
2343 }
2345 // Update instanceKlass with inner class info.
2346 k->set_inner_classes(inner_classes());
2347 return length;
2348 }
2350 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2351 k->set_is_synthetic();
2352 }
2354 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2355 ClassFileStream* cfs = stream();
2356 u2 signature_index = cfs->get_u2(CHECK);
2357 check_property(
2358 valid_cp_range(signature_index, cp->length()) &&
2359 cp->tag_at(signature_index).is_utf8(),
2360 "Invalid constant pool index %u in Signature attribute in class file %s",
2361 signature_index, CHECK);
2362 k->set_generic_signature(cp->symbol_at(signature_index));
2363 }
2365 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2366 u4 attribute_byte_length, TRAPS) {
2367 ClassFileStream* cfs = stream();
2368 u1* current_start = cfs->current();
2370 cfs->guarantee_more(2, CHECK); // length
2371 int attribute_array_length = cfs->get_u2_fast();
2373 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2374 "Short length on BootstrapMethods in class file %s",
2375 CHECK);
2377 // The attribute contains a counted array of counted tuples of shorts,
2378 // represending bootstrap specifiers:
2379 // length*{bootstrap_method_index, argument_count*{argument_index}}
2380 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2381 // operand_count = number of shorts in attr, except for leading length
2383 // The attribute is copied into a short[] array.
2384 // The array begins with a series of short[2] pairs, one for each tuple.
2385 int index_size = (attribute_array_length * 2);
2387 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2388 typeArrayHandle operands(THREAD, operands_oop);
2389 operands_oop = NULL; // tidy
2391 int operand_fill_index = index_size;
2392 int cp_size = cp->length();
2394 for (int n = 0; n < attribute_array_length; n++) {
2395 // Store a 32-bit offset into the header of the operand array.
2396 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2397 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2399 // Read a bootstrap specifier.
2400 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2401 u2 bootstrap_method_index = cfs->get_u2_fast();
2402 u2 argument_count = cfs->get_u2_fast();
2403 check_property(
2404 valid_cp_range(bootstrap_method_index, cp_size) &&
2405 cp->tag_at(bootstrap_method_index).is_method_handle(),
2406 "bootstrap_method_index %u has bad constant type in class file %s",
2407 bootstrap_method_index,
2408 CHECK);
2409 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2410 operands->short_at_put(operand_fill_index++, argument_count);
2412 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2413 for (int j = 0; j < argument_count; j++) {
2414 u2 argument_index = cfs->get_u2_fast();
2415 check_property(
2416 valid_cp_range(argument_index, cp_size) &&
2417 cp->tag_at(argument_index).is_loadable_constant(),
2418 "argument_index %u has bad constant type in class file %s",
2419 argument_index,
2420 CHECK);
2421 operands->short_at_put(operand_fill_index++, argument_index);
2422 }
2423 }
2425 assert(operand_fill_index == operands()->length(), "exact fill");
2426 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2428 u1* current_end = cfs->current();
2429 guarantee_property(current_end == current_start + attribute_byte_length,
2430 "Bad length on BootstrapMethods in class file %s",
2431 CHECK);
2433 cp->set_operands(operands());
2434 }
2437 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2438 ClassFileStream* cfs = stream();
2439 // Set inner classes attribute to default sentinel
2440 k->set_inner_classes(Universe::the_empty_short_array());
2441 cfs->guarantee_more(2, CHECK); // attributes_count
2442 u2 attributes_count = cfs->get_u2_fast();
2443 bool parsed_sourcefile_attribute = false;
2444 bool parsed_innerclasses_attribute = false;
2445 bool parsed_enclosingmethod_attribute = false;
2446 bool parsed_bootstrap_methods_attribute = false;
2447 u1* runtime_visible_annotations = NULL;
2448 int runtime_visible_annotations_length = 0;
2449 u1* runtime_invisible_annotations = NULL;
2450 int runtime_invisible_annotations_length = 0;
2451 // Iterate over attributes
2452 while (attributes_count--) {
2453 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2454 u2 attribute_name_index = cfs->get_u2_fast();
2455 u4 attribute_length = cfs->get_u4_fast();
2456 check_property(
2457 valid_cp_range(attribute_name_index, cp->length()) &&
2458 cp->tag_at(attribute_name_index).is_utf8(),
2459 "Attribute name has bad constant pool index %u in class file %s",
2460 attribute_name_index, CHECK);
2461 Symbol* tag = cp->symbol_at(attribute_name_index);
2462 if (tag == vmSymbols::tag_source_file()) {
2463 // Check for SourceFile tag
2464 if (_need_verify) {
2465 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2466 }
2467 if (parsed_sourcefile_attribute) {
2468 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2469 } else {
2470 parsed_sourcefile_attribute = true;
2471 }
2472 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2473 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2474 // Check for SourceDebugExtension tag
2475 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2476 } else if (tag == vmSymbols::tag_inner_classes()) {
2477 // Check for InnerClasses tag
2478 if (parsed_innerclasses_attribute) {
2479 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2480 } else {
2481 parsed_innerclasses_attribute = true;
2482 }
2483 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2484 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2485 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2486 "Wrong InnerClasses attribute length in class file %s", CHECK);
2487 }
2488 } else if (tag == vmSymbols::tag_synthetic()) {
2489 // Check for Synthetic tag
2490 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2491 if (attribute_length != 0) {
2492 classfile_parse_error(
2493 "Invalid Synthetic classfile attribute length %u in class file %s",
2494 attribute_length, CHECK);
2495 }
2496 parse_classfile_synthetic_attribute(cp, k, CHECK);
2497 } else if (tag == vmSymbols::tag_deprecated()) {
2498 // Check for Deprecatd tag - 4276120
2499 if (attribute_length != 0) {
2500 classfile_parse_error(
2501 "Invalid Deprecated classfile attribute length %u in class file %s",
2502 attribute_length, CHECK);
2503 }
2504 } else if (_major_version >= JAVA_1_5_VERSION) {
2505 if (tag == vmSymbols::tag_signature()) {
2506 if (attribute_length != 2) {
2507 classfile_parse_error(
2508 "Wrong Signature attribute length %u in class file %s",
2509 attribute_length, CHECK);
2510 }
2511 parse_classfile_signature_attribute(cp, k, CHECK);
2512 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2513 runtime_visible_annotations_length = attribute_length;
2514 runtime_visible_annotations = cfs->get_u1_buffer();
2515 assert(runtime_visible_annotations != NULL, "null visible annotations");
2516 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2517 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2518 runtime_invisible_annotations_length = attribute_length;
2519 runtime_invisible_annotations = cfs->get_u1_buffer();
2520 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2521 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2522 } else if (tag == vmSymbols::tag_enclosing_method()) {
2523 if (parsed_enclosingmethod_attribute) {
2524 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2525 } else {
2526 parsed_enclosingmethod_attribute = true;
2527 }
2528 cfs->guarantee_more(4, CHECK); // class_index, method_index
2529 u2 class_index = cfs->get_u2_fast();
2530 u2 method_index = cfs->get_u2_fast();
2531 if (class_index == 0) {
2532 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2533 }
2534 // Validate the constant pool indices and types
2535 if (!cp->is_within_bounds(class_index) ||
2536 !is_klass_reference(cp, class_index)) {
2537 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2538 }
2539 if (method_index != 0 &&
2540 (!cp->is_within_bounds(method_index) ||
2541 !cp->tag_at(method_index).is_name_and_type())) {
2542 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2543 }
2544 k->set_enclosing_method_indices(class_index, method_index);
2545 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2546 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2547 if (parsed_bootstrap_methods_attribute)
2548 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2549 parsed_bootstrap_methods_attribute = true;
2550 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2551 } else {
2552 // Unknown attribute
2553 cfs->skip_u1(attribute_length, CHECK);
2554 }
2555 } else {
2556 // Unknown attribute
2557 cfs->skip_u1(attribute_length, CHECK);
2558 }
2559 }
2560 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2561 runtime_visible_annotations_length,
2562 runtime_invisible_annotations,
2563 runtime_invisible_annotations_length,
2564 CHECK);
2565 k->set_class_annotations(annotations());
2567 if (_max_bootstrap_specifier_index >= 0) {
2568 guarantee_property(parsed_bootstrap_methods_attribute,
2569 "Missing BootstrapMethods attribute in class file %s", CHECK);
2570 }
2571 }
2574 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2575 int runtime_visible_annotations_length,
2576 u1* runtime_invisible_annotations,
2577 int runtime_invisible_annotations_length, TRAPS) {
2578 typeArrayHandle annotations;
2579 if (runtime_visible_annotations != NULL ||
2580 runtime_invisible_annotations != NULL) {
2581 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2582 runtime_invisible_annotations_length, CHECK_(annotations));
2583 annotations = typeArrayHandle(THREAD, anno);
2584 if (runtime_visible_annotations != NULL) {
2585 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2586 }
2587 if (runtime_invisible_annotations != NULL) {
2588 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2589 }
2590 }
2591 return annotations;
2592 }
2595 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2596 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2597 // This code is for compatibility with earlier jdk's that do not
2598 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2599 // the check for the "discovered" field should issue a warning if
2600 // the field is not found. For 1.6 this code should be issue a
2601 // fatal error if the "discovered" field is not found.
2602 //
2603 // Increment fac.nonstatic_oop_count so that the start of the
2604 // next type of non-static oops leaves room for the fake oop.
2605 // Do not increment next_nonstatic_oop_offset so that the
2606 // fake oop is place after the java.lang.ref.Reference oop
2607 // fields.
2608 //
2609 // Check the fields in java.lang.ref.Reference for the "discovered"
2610 // field. If it is not present, artifically create a field for it.
2611 // This allows this VM to run on early JDK where the field is not
2612 // present.
2613 int reference_sig_index = 0;
2614 int reference_name_index = 0;
2615 int reference_index = 0;
2616 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2617 const int n = (*fields_ptr)()->length();
2618 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2619 int name_index =
2620 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2621 int sig_index =
2622 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2623 Symbol* f_name = cp->symbol_at(name_index);
2624 Symbol* f_sig = cp->symbol_at(sig_index);
2625 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2626 // Save the index for reference signature for later use.
2627 // The fake discovered field does not entries in the
2628 // constant pool so the index for its signature cannot
2629 // be extracted from the constant pool. It will need
2630 // later, however. It's signature is vmSymbols::reference_signature()
2631 // so same an index for that signature.
2632 reference_sig_index = sig_index;
2633 reference_name_index = name_index;
2634 reference_index = i;
2635 }
2636 if (f_name == vmSymbols::reference_discovered_name() &&
2637 f_sig == vmSymbols::reference_signature()) {
2638 // The values below are fake but will force extra
2639 // non-static oop fields and a corresponding non-static
2640 // oop map block to be allocated.
2641 extra = 0;
2642 break;
2643 }
2644 }
2645 if (extra != 0) {
2646 fac_ptr->nonstatic_oop_count += extra;
2647 // Add the additional entry to "fields" so that the klass
2648 // contains the "discoverd" field and the field will be initialized
2649 // in instances of the object.
2650 int fields_with_fix_length = (*fields_ptr)()->length() +
2651 instanceKlass::next_offset;
2652 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2653 fields_with_fix_length, CHECK);
2654 typeArrayHandle fields_with_fix(THREAD, ff);
2656 // Take everything from the original but the length.
2657 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2658 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2659 }
2661 // Add the fake field at the end.
2662 int i = (*fields_ptr)->length();
2663 // There is no name index for the fake "discovered" field nor
2664 // signature but a signature is needed so that the field will
2665 // be properly initialized. Use one found for
2666 // one of the other reference fields. Be sure the index for the
2667 // name is 0. In fieldDescriptor::initialize() the index of the
2668 // name is checked. That check is by passed for the last nonstatic
2669 // oop field in a java.lang.ref.Reference which is assumed to be
2670 // this artificial "discovered" field. An assertion checks that
2671 // the name index is 0.
2672 assert(reference_index != 0, "Missing signature for reference");
2674 int j;
2675 for (j = 0; j < instanceKlass::next_offset; j++) {
2676 fields_with_fix->ushort_at_put(i + j,
2677 (*fields_ptr)->ushort_at(reference_index +j));
2678 }
2679 // Clear the public access flag and set the private access flag.
2680 short flags;
2681 flags =
2682 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2683 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2684 flags = flags & (~JVM_ACC_PUBLIC);
2685 flags = flags | JVM_ACC_PRIVATE;
2686 AccessFlags access_flags;
2687 access_flags.set_flags(flags);
2688 assert(!access_flags.is_public(), "Failed to clear public flag");
2689 assert(access_flags.is_private(), "Failed to set private flag");
2690 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2691 flags);
2693 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2694 == reference_name_index, "The fake reference name is incorrect");
2695 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2696 == reference_sig_index, "The fake reference signature is incorrect");
2697 // The type of the field is stored in the low_offset entry during
2698 // parsing.
2699 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2700 NONSTATIC_OOP, "The fake reference type is incorrect");
2702 // "fields" is allocated in the permanent generation. Disgard
2703 // it and let it be collected.
2704 (*fields_ptr) = fields_with_fix;
2705 }
2706 return;
2707 }
2710 void ClassFileParser::java_lang_Class_fix_pre(int* nonstatic_field_size,
2711 FieldAllocationCount *fac_ptr) {
2712 // Add fake fields for java.lang.Class instances
2713 //
2714 // This is not particularly nice. We should consider adding a
2715 // private transient object field at the Java level to
2716 // java.lang.Class. Alternatively we could add a subclass of
2717 // instanceKlass which provides an accessor and size computer for
2718 // this field, but that appears to be more code than this hack.
2719 //
2720 // NOTE that we wedge these in at the beginning rather than the
2721 // end of the object because the Class layout changed between JDK
2722 // 1.3 and JDK 1.4 with the new reflection implementation; some
2723 // nonstatic oop fields were added at the Java level. The offsets
2724 // of these fake fields can't change between these two JDK
2725 // versions because when the offsets are computed at bootstrap
2726 // time we don't know yet which version of the JDK we're running in.
2728 // The values below are fake but will force three non-static oop fields and
2729 // a corresponding non-static oop map block to be allocated.
2730 const int extra = java_lang_Class::number_of_fake_oop_fields;
2731 fac_ptr->nonstatic_oop_count += extra;
2733 // Reserve some leading space for fake ints
2734 *nonstatic_field_size += align_size_up(java_lang_Class::hc_number_of_fake_int_fields * BytesPerInt, heapOopSize) / heapOopSize;
2735 }
2738 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2739 // Cause the extra fake fields in java.lang.Class to show up before
2740 // the Java fields for layout compatibility between 1.3 and 1.4
2741 // Incrementing next_nonstatic_oop_offset here advances the
2742 // location where the real java fields are placed.
2743 const int extra = java_lang_Class::number_of_fake_oop_fields;
2744 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2745 }
2748 // Force MethodHandle.vmentry to be an unmanaged pointer.
2749 // There is no way for a classfile to express this, so we must help it.
2750 void ClassFileParser::java_lang_invoke_MethodHandle_fix_pre(constantPoolHandle cp,
2751 typeArrayHandle fields,
2752 FieldAllocationCount *fac_ptr,
2753 TRAPS) {
2754 // Add fake fields for java.lang.invoke.MethodHandle instances
2755 //
2756 // This is not particularly nice, but since there is no way to express
2757 // a native wordSize field in Java, we must do it at this level.
2759 if (!EnableInvokeDynamic) return;
2761 int word_sig_index = 0;
2762 const int cp_size = cp->length();
2763 for (int index = 1; index < cp_size; index++) {
2764 if (cp->tag_at(index).is_utf8() &&
2765 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2766 word_sig_index = index;
2767 break;
2768 }
2769 }
2771 if (word_sig_index == 0)
2772 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2773 "missing I or J signature (for vmentry) in java.lang.invoke.MethodHandle");
2775 // Find vmentry field and change the signature.
2776 bool found_vmentry = false;
2777 for (int i = 0; i < fields->length(); i += instanceKlass::next_offset) {
2778 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
2779 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
2780 int acc_flags = fields->ushort_at(i + instanceKlass::access_flags_offset);
2781 Symbol* f_name = cp->symbol_at(name_index);
2782 Symbol* f_sig = cp->symbol_at(sig_index);
2783 if (f_name == vmSymbols::vmentry_name() && (acc_flags & JVM_ACC_STATIC) == 0) {
2784 if (f_sig == vmSymbols::machine_word_signature()) {
2785 // If the signature of vmentry is already changed, we're done.
2786 found_vmentry = true;
2787 break;
2788 }
2789 else if (f_sig == vmSymbols::byte_signature()) {
2790 // Adjust the field type from byte to an unmanaged pointer.
2791 assert(fac_ptr->nonstatic_byte_count > 0, "");
2792 fac_ptr->nonstatic_byte_count -= 1;
2794 fields->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2795 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2796 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2797 else fac_ptr->nonstatic_word_count += 1;
2799 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
2800 assert(atype == NONSTATIC_BYTE, "");
2801 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2802 fields->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2804 found_vmentry = true;
2805 break;
2806 }
2807 }
2808 }
2810 if (!found_vmentry)
2811 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2812 "missing vmentry byte field in java.lang.invoke.MethodHandle");
2813 }
2816 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2817 Handle class_loader,
2818 Handle protection_domain,
2819 KlassHandle host_klass,
2820 GrowableArray<Handle>* cp_patches,
2821 TempNewSymbol& parsed_name,
2822 bool verify,
2823 TRAPS) {
2824 // So that JVMTI can cache class file in the state before retransformable agents
2825 // have modified it
2826 unsigned char *cached_class_file_bytes = NULL;
2827 jint cached_class_file_length;
2829 ClassFileStream* cfs = stream();
2830 // Timing
2831 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2832 JavaThread* jt = (JavaThread*) THREAD;
2834 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2835 ClassLoader::perf_class_parse_selftime(),
2836 NULL,
2837 jt->get_thread_stat()->perf_recursion_counts_addr(),
2838 jt->get_thread_stat()->perf_timers_addr(),
2839 PerfClassTraceTime::PARSE_CLASS);
2841 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2842 _max_bootstrap_specifier_index = -1;
2844 if (JvmtiExport::should_post_class_file_load_hook()) {
2845 unsigned char* ptr = cfs->buffer();
2846 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2848 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2849 &ptr, &end_ptr,
2850 &cached_class_file_bytes,
2851 &cached_class_file_length);
2853 if (ptr != cfs->buffer()) {
2854 // JVMTI agent has modified class file data.
2855 // Set new class file stream using JVMTI agent modified
2856 // class file data.
2857 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2858 set_stream(cfs);
2859 }
2860 }
2862 _host_klass = host_klass;
2863 _cp_patches = cp_patches;
2865 instanceKlassHandle nullHandle;
2867 // Figure out whether we can skip format checking (matching classic VM behavior)
2868 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2870 // Set the verify flag in stream
2871 cfs->set_verify(_need_verify);
2873 // Save the class file name for easier error message printing.
2874 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2876 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2877 // Magic value
2878 u4 magic = cfs->get_u4_fast();
2879 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2880 "Incompatible magic value %u in class file %s",
2881 magic, CHECK_(nullHandle));
2883 // Version numbers
2884 u2 minor_version = cfs->get_u2_fast();
2885 u2 major_version = cfs->get_u2_fast();
2887 // Check version numbers - we check this even with verifier off
2888 if (!is_supported_version(major_version, minor_version)) {
2889 if (name == NULL) {
2890 Exceptions::fthrow(
2891 THREAD_AND_LOCATION,
2892 vmSymbols::java_lang_UnsupportedClassVersionError(),
2893 "Unsupported major.minor version %u.%u",
2894 major_version,
2895 minor_version);
2896 } else {
2897 ResourceMark rm(THREAD);
2898 Exceptions::fthrow(
2899 THREAD_AND_LOCATION,
2900 vmSymbols::java_lang_UnsupportedClassVersionError(),
2901 "%s : Unsupported major.minor version %u.%u",
2902 name->as_C_string(),
2903 major_version,
2904 minor_version);
2905 }
2906 return nullHandle;
2907 }
2909 _major_version = major_version;
2910 _minor_version = minor_version;
2913 // Check if verification needs to be relaxed for this class file
2914 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2915 _relax_verify = Verifier::relax_verify_for(class_loader());
2917 // Constant pool
2918 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2919 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2921 int cp_size = cp->length();
2923 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2925 // Access flags
2926 AccessFlags access_flags;
2927 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2929 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2930 // Set abstract bit for old class files for backward compatibility
2931 flags |= JVM_ACC_ABSTRACT;
2932 }
2933 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2934 access_flags.set_flags(flags);
2936 // This class and superclass
2937 instanceKlassHandle super_klass;
2938 u2 this_class_index = cfs->get_u2_fast();
2939 check_property(
2940 valid_cp_range(this_class_index, cp_size) &&
2941 cp->tag_at(this_class_index).is_unresolved_klass(),
2942 "Invalid this class index %u in constant pool in class file %s",
2943 this_class_index, CHECK_(nullHandle));
2945 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2946 assert(class_name != NULL, "class_name can't be null");
2948 // It's important to set parsed_name *before* resolving the super class.
2949 // (it's used for cleanup by the caller if parsing fails)
2950 parsed_name = class_name;
2951 // parsed_name is returned and can be used if there's an error, so add to
2952 // its reference count. Caller will decrement the refcount.
2953 parsed_name->increment_refcount();
2955 // Update _class_name which could be null previously to be class_name
2956 _class_name = class_name;
2958 // Don't need to check whether this class name is legal or not.
2959 // It has been checked when constant pool is parsed.
2960 // However, make sure it is not an array type.
2961 if (_need_verify) {
2962 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2963 "Bad class name in class file %s",
2964 CHECK_(nullHandle));
2965 }
2967 klassOop preserve_this_klass; // for storing result across HandleMark
2969 // release all handles when parsing is done
2970 { HandleMark hm(THREAD);
2972 // Checks if name in class file matches requested name
2973 if (name != NULL && class_name != name) {
2974 ResourceMark rm(THREAD);
2975 Exceptions::fthrow(
2976 THREAD_AND_LOCATION,
2977 vmSymbols::java_lang_NoClassDefFoundError(),
2978 "%s (wrong name: %s)",
2979 name->as_C_string(),
2980 class_name->as_C_string()
2981 );
2982 return nullHandle;
2983 }
2985 if (TraceClassLoadingPreorder) {
2986 tty->print("[Loading %s", name->as_klass_external_name());
2987 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2988 tty->print_cr("]");
2989 }
2991 u2 super_class_index = cfs->get_u2_fast();
2992 if (super_class_index == 0) {
2993 check_property(class_name == vmSymbols::java_lang_Object(),
2994 "Invalid superclass index %u in class file %s",
2995 super_class_index,
2996 CHECK_(nullHandle));
2997 } else {
2998 check_property(valid_cp_range(super_class_index, cp_size) &&
2999 is_klass_reference(cp, super_class_index),
3000 "Invalid superclass index %u in class file %s",
3001 super_class_index,
3002 CHECK_(nullHandle));
3003 // The class name should be legal because it is checked when parsing constant pool.
3004 // However, make sure it is not an array type.
3005 bool is_array = false;
3006 if (cp->tag_at(super_class_index).is_klass()) {
3007 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3008 if (_need_verify)
3009 is_array = super_klass->oop_is_array();
3010 } else if (_need_verify) {
3011 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3012 }
3013 if (_need_verify) {
3014 guarantee_property(!is_array,
3015 "Bad superclass name in class file %s", CHECK_(nullHandle));
3016 }
3017 }
3019 // Interfaces
3020 u2 itfs_len = cfs->get_u2_fast();
3021 objArrayHandle local_interfaces;
3022 if (itfs_len == 0) {
3023 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3024 } else {
3025 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
3026 }
3028 // Fields (offsets are filled in later)
3029 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
3030 objArrayHandle fields_annotations;
3031 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
3032 // Methods
3033 bool has_final_method = false;
3034 AccessFlags promoted_flags;
3035 promoted_flags.set_flags(0);
3036 // These need to be oop pointers because they are allocated lazily
3037 // inside parse_methods inside a nested HandleMark
3038 objArrayOop methods_annotations_oop = NULL;
3039 objArrayOop methods_parameter_annotations_oop = NULL;
3040 objArrayOop methods_default_annotations_oop = NULL;
3041 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
3042 &promoted_flags,
3043 &has_final_method,
3044 &methods_annotations_oop,
3045 &methods_parameter_annotations_oop,
3046 &methods_default_annotations_oop,
3047 CHECK_(nullHandle));
3049 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
3050 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
3051 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
3053 // We check super class after class file is parsed and format is checked
3054 if (super_class_index > 0 && super_klass.is_null()) {
3055 Symbol* sk = cp->klass_name_at(super_class_index);
3056 if (access_flags.is_interface()) {
3057 // Before attempting to resolve the superclass, check for class format
3058 // errors not checked yet.
3059 guarantee_property(sk == vmSymbols::java_lang_Object(),
3060 "Interfaces must have java.lang.Object as superclass in class file %s",
3061 CHECK_(nullHandle));
3062 }
3063 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
3064 sk,
3065 class_loader,
3066 protection_domain,
3067 true,
3068 CHECK_(nullHandle));
3070 KlassHandle kh (THREAD, k);
3071 super_klass = instanceKlassHandle(THREAD, kh());
3072 if (LinkWellKnownClasses) // my super class is well known to me
3073 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3074 }
3075 if (super_klass.not_null()) {
3076 if (super_klass->is_interface()) {
3077 ResourceMark rm(THREAD);
3078 Exceptions::fthrow(
3079 THREAD_AND_LOCATION,
3080 vmSymbols::java_lang_IncompatibleClassChangeError(),
3081 "class %s has interface %s as super class",
3082 class_name->as_klass_external_name(),
3083 super_klass->external_name()
3084 );
3085 return nullHandle;
3086 }
3087 // Make sure super class is not final
3088 if (super_klass->is_final()) {
3089 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3090 }
3091 }
3093 // Compute the transitive list of all unique interfaces implemented by this class
3094 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3096 // sort methods
3097 typeArrayHandle method_ordering = sort_methods(methods,
3098 methods_annotations,
3099 methods_parameter_annotations,
3100 methods_default_annotations,
3101 CHECK_(nullHandle));
3103 // promote flags from parse_methods() to the klass' flags
3104 access_flags.add_promoted_flags(promoted_flags.as_int());
3106 // Size of Java vtable (in words)
3107 int vtable_size = 0;
3108 int itable_size = 0;
3109 int num_miranda_methods = 0;
3111 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3112 num_miranda_methods,
3113 super_klass(),
3114 methods(),
3115 access_flags,
3116 class_loader,
3117 class_name,
3118 local_interfaces(),
3119 CHECK_(nullHandle));
3121 // Size of Java itable (in words)
3122 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3124 // Field size and offset computation
3125 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3126 #ifndef PRODUCT
3127 int orig_nonstatic_field_size = 0;
3128 #endif
3129 int static_field_size = 0;
3130 int next_static_oop_offset;
3131 int next_static_double_offset;
3132 int next_static_word_offset;
3133 int next_static_short_offset;
3134 int next_static_byte_offset;
3135 int next_static_type_offset;
3136 int next_nonstatic_oop_offset;
3137 int next_nonstatic_double_offset;
3138 int next_nonstatic_word_offset;
3139 int next_nonstatic_short_offset;
3140 int next_nonstatic_byte_offset;
3141 int next_nonstatic_type_offset;
3142 int first_nonstatic_oop_offset;
3143 int first_nonstatic_field_offset;
3144 int next_nonstatic_field_offset;
3146 // Calculate the starting byte offsets
3147 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3148 next_static_double_offset = next_static_oop_offset +
3149 (fac.static_oop_count * heapOopSize);
3150 if ( fac.static_double_count &&
3151 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3152 Universe::field_type_should_be_aligned(T_LONG)) ) {
3153 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3154 }
3156 next_static_word_offset = next_static_double_offset +
3157 (fac.static_double_count * BytesPerLong);
3158 next_static_short_offset = next_static_word_offset +
3159 (fac.static_word_count * BytesPerInt);
3160 next_static_byte_offset = next_static_short_offset +
3161 (fac.static_short_count * BytesPerShort);
3162 next_static_type_offset = align_size_up((next_static_byte_offset +
3163 fac.static_byte_count ), wordSize );
3164 static_field_size = (next_static_type_offset -
3165 next_static_oop_offset) / wordSize;
3167 // Add fake fields for java.lang.Class instances (also see below)
3168 if (class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3169 java_lang_Class_fix_pre(&nonstatic_field_size, &fac);
3170 }
3172 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3173 nonstatic_field_size * heapOopSize;
3174 next_nonstatic_field_offset = first_nonstatic_field_offset;
3176 // adjust the vmentry field declaration in java.lang.invoke.MethodHandle
3177 if (EnableInvokeDynamic && class_name == vmSymbols::java_lang_invoke_MethodHandle() && class_loader.is_null()) {
3178 java_lang_invoke_MethodHandle_fix_pre(cp, fields, &fac, CHECK_(nullHandle));
3179 }
3181 // Add a fake "discovered" field if it is not present
3182 // for compatibility with earlier jdk's.
3183 if (class_name == vmSymbols::java_lang_ref_Reference()
3184 && class_loader.is_null()) {
3185 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3186 }
3187 // end of "discovered" field compactibility fix
3189 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3190 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3191 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3192 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3193 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3195 bool super_has_nonstatic_fields =
3196 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3197 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3198 ((nonstatic_double_count + nonstatic_word_count +
3199 nonstatic_short_count + nonstatic_byte_count +
3200 nonstatic_oop_count) != 0);
3203 // Prepare list of oops for oop map generation.
3204 int* nonstatic_oop_offsets;
3205 unsigned int* nonstatic_oop_counts;
3206 unsigned int nonstatic_oop_map_count = 0;
3208 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3209 THREAD, int, nonstatic_oop_count + 1);
3210 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3211 THREAD, unsigned int, nonstatic_oop_count + 1);
3213 // Add fake fields for java.lang.Class instances (also see above).
3214 // FieldsAllocationStyle and CompactFields values will be reset to default.
3215 if(class_name == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3216 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3217 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3218 const uint fake_oop_count = (next_nonstatic_field_offset -
3219 first_nonstatic_field_offset) / heapOopSize;
3220 nonstatic_oop_counts[0] = fake_oop_count;
3221 nonstatic_oop_map_count = 1;
3222 nonstatic_oop_count -= fake_oop_count;
3223 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3224 } else {
3225 first_nonstatic_oop_offset = 0; // will be set for first oop field
3226 }
3228 #ifndef PRODUCT
3229 if( PrintCompactFieldsSavings ) {
3230 next_nonstatic_double_offset = next_nonstatic_field_offset +
3231 (nonstatic_oop_count * heapOopSize);
3232 if ( nonstatic_double_count > 0 ) {
3233 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3234 }
3235 next_nonstatic_word_offset = next_nonstatic_double_offset +
3236 (nonstatic_double_count * BytesPerLong);
3237 next_nonstatic_short_offset = next_nonstatic_word_offset +
3238 (nonstatic_word_count * BytesPerInt);
3239 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3240 (nonstatic_short_count * BytesPerShort);
3241 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3242 nonstatic_byte_count ), heapOopSize );
3243 orig_nonstatic_field_size = nonstatic_field_size +
3244 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3245 }
3246 #endif
3247 bool compact_fields = CompactFields;
3248 int allocation_style = FieldsAllocationStyle;
3249 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3250 assert(false, "0 <= FieldsAllocationStyle <= 2");
3251 allocation_style = 1; // Optimistic
3252 }
3254 // The next classes have predefined hard-coded fields offsets
3255 // (see in JavaClasses::compute_hard_coded_offsets()).
3256 // Use default fields allocation order for them.
3257 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3258 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3259 class_name == vmSymbols::java_lang_Class() ||
3260 class_name == vmSymbols::java_lang_ClassLoader() ||
3261 class_name == vmSymbols::java_lang_ref_Reference() ||
3262 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3263 class_name == vmSymbols::java_lang_StackTraceElement() ||
3264 class_name == vmSymbols::java_lang_String() ||
3265 class_name == vmSymbols::java_lang_Throwable() ||
3266 class_name == vmSymbols::java_lang_Boolean() ||
3267 class_name == vmSymbols::java_lang_Character() ||
3268 class_name == vmSymbols::java_lang_Float() ||
3269 class_name == vmSymbols::java_lang_Double() ||
3270 class_name == vmSymbols::java_lang_Byte() ||
3271 class_name == vmSymbols::java_lang_Short() ||
3272 class_name == vmSymbols::java_lang_Integer() ||
3273 class_name == vmSymbols::java_lang_Long())) {
3274 allocation_style = 0; // Allocate oops first
3275 compact_fields = false; // Don't compact fields
3276 }
3278 if( allocation_style == 0 ) {
3279 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3280 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3281 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3282 (nonstatic_oop_count * heapOopSize);
3283 } else if( allocation_style == 1 ) {
3284 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3285 next_nonstatic_double_offset = next_nonstatic_field_offset;
3286 } else if( allocation_style == 2 ) {
3287 // Fields allocation: oops fields in super and sub classes are together.
3288 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3289 super_klass->nonstatic_oop_map_size() > 0 ) {
3290 int map_count = super_klass->nonstatic_oop_map_count();
3291 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3292 OopMapBlock* last_map = first_map + map_count - 1;
3293 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3294 if (next_offset == next_nonstatic_field_offset) {
3295 allocation_style = 0; // allocate oops first
3296 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3297 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3298 (nonstatic_oop_count * heapOopSize);
3299 }
3300 }
3301 if( allocation_style == 2 ) {
3302 allocation_style = 1; // allocate oops last
3303 next_nonstatic_double_offset = next_nonstatic_field_offset;
3304 }
3305 } else {
3306 ShouldNotReachHere();
3307 }
3309 int nonstatic_oop_space_count = 0;
3310 int nonstatic_word_space_count = 0;
3311 int nonstatic_short_space_count = 0;
3312 int nonstatic_byte_space_count = 0;
3313 int nonstatic_oop_space_offset;
3314 int nonstatic_word_space_offset;
3315 int nonstatic_short_space_offset;
3316 int nonstatic_byte_space_offset;
3318 if( nonstatic_double_count > 0 ) {
3319 int offset = next_nonstatic_double_offset;
3320 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3321 if( compact_fields && offset != next_nonstatic_double_offset ) {
3322 // Allocate available fields into the gap before double field.
3323 int length = next_nonstatic_double_offset - offset;
3324 assert(length == BytesPerInt, "");
3325 nonstatic_word_space_offset = offset;
3326 if( nonstatic_word_count > 0 ) {
3327 nonstatic_word_count -= 1;
3328 nonstatic_word_space_count = 1; // Only one will fit
3329 length -= BytesPerInt;
3330 offset += BytesPerInt;
3331 }
3332 nonstatic_short_space_offset = offset;
3333 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3334 nonstatic_short_count -= 1;
3335 nonstatic_short_space_count += 1;
3336 length -= BytesPerShort;
3337 offset += BytesPerShort;
3338 }
3339 nonstatic_byte_space_offset = offset;
3340 while( length > 0 && nonstatic_byte_count > 0 ) {
3341 nonstatic_byte_count -= 1;
3342 nonstatic_byte_space_count += 1;
3343 length -= 1;
3344 }
3345 // Allocate oop field in the gap if there are no other fields for that.
3346 nonstatic_oop_space_offset = offset;
3347 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3348 allocation_style != 0 ) { // when oop fields not first
3349 nonstatic_oop_count -= 1;
3350 nonstatic_oop_space_count = 1; // Only one will fit
3351 length -= heapOopSize;
3352 offset += heapOopSize;
3353 }
3354 }
3355 }
3357 next_nonstatic_word_offset = next_nonstatic_double_offset +
3358 (nonstatic_double_count * BytesPerLong);
3359 next_nonstatic_short_offset = next_nonstatic_word_offset +
3360 (nonstatic_word_count * BytesPerInt);
3361 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3362 (nonstatic_short_count * BytesPerShort);
3364 int notaligned_offset;
3365 if( allocation_style == 0 ) {
3366 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3367 } else { // allocation_style == 1
3368 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3369 if( nonstatic_oop_count > 0 ) {
3370 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3371 }
3372 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3373 }
3374 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3375 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3376 - first_nonstatic_field_offset)/heapOopSize);
3378 // Iterate over fields again and compute correct offsets.
3379 // The field allocation type was temporarily stored in the offset slot.
3380 // oop fields are located before non-oop fields (static and non-static).
3381 int len = fields->length();
3382 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3383 int real_offset;
3384 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3385 switch (atype) {
3386 case STATIC_OOP:
3387 real_offset = next_static_oop_offset;
3388 next_static_oop_offset += heapOopSize;
3389 break;
3390 case STATIC_BYTE:
3391 real_offset = next_static_byte_offset;
3392 next_static_byte_offset += 1;
3393 break;
3394 case STATIC_SHORT:
3395 real_offset = next_static_short_offset;
3396 next_static_short_offset += BytesPerShort;
3397 break;
3398 case STATIC_WORD:
3399 real_offset = next_static_word_offset;
3400 next_static_word_offset += BytesPerInt;
3401 break;
3402 case STATIC_ALIGNED_DOUBLE:
3403 case STATIC_DOUBLE:
3404 real_offset = next_static_double_offset;
3405 next_static_double_offset += BytesPerLong;
3406 break;
3407 case NONSTATIC_OOP:
3408 if( nonstatic_oop_space_count > 0 ) {
3409 real_offset = nonstatic_oop_space_offset;
3410 nonstatic_oop_space_offset += heapOopSize;
3411 nonstatic_oop_space_count -= 1;
3412 } else {
3413 real_offset = next_nonstatic_oop_offset;
3414 next_nonstatic_oop_offset += heapOopSize;
3415 }
3416 // Update oop maps
3417 if( nonstatic_oop_map_count > 0 &&
3418 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3419 real_offset -
3420 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3421 heapOopSize ) {
3422 // Extend current oop map
3423 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3424 } else {
3425 // Create new oop map
3426 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3427 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3428 nonstatic_oop_map_count += 1;
3429 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3430 first_nonstatic_oop_offset = real_offset;
3431 }
3432 }
3433 break;
3434 case NONSTATIC_BYTE:
3435 if( nonstatic_byte_space_count > 0 ) {
3436 real_offset = nonstatic_byte_space_offset;
3437 nonstatic_byte_space_offset += 1;
3438 nonstatic_byte_space_count -= 1;
3439 } else {
3440 real_offset = next_nonstatic_byte_offset;
3441 next_nonstatic_byte_offset += 1;
3442 }
3443 break;
3444 case NONSTATIC_SHORT:
3445 if( nonstatic_short_space_count > 0 ) {
3446 real_offset = nonstatic_short_space_offset;
3447 nonstatic_short_space_offset += BytesPerShort;
3448 nonstatic_short_space_count -= 1;
3449 } else {
3450 real_offset = next_nonstatic_short_offset;
3451 next_nonstatic_short_offset += BytesPerShort;
3452 }
3453 break;
3454 case NONSTATIC_WORD:
3455 if( nonstatic_word_space_count > 0 ) {
3456 real_offset = nonstatic_word_space_offset;
3457 nonstatic_word_space_offset += BytesPerInt;
3458 nonstatic_word_space_count -= 1;
3459 } else {
3460 real_offset = next_nonstatic_word_offset;
3461 next_nonstatic_word_offset += BytesPerInt;
3462 }
3463 break;
3464 case NONSTATIC_ALIGNED_DOUBLE:
3465 case NONSTATIC_DOUBLE:
3466 real_offset = next_nonstatic_double_offset;
3467 next_nonstatic_double_offset += BytesPerLong;
3468 break;
3469 default:
3470 ShouldNotReachHere();
3471 }
3472 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3473 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3474 }
3476 // Size of instances
3477 int instance_size;
3479 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3480 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3482 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3484 // Number of non-static oop map blocks allocated at end of klass.
3485 const unsigned int total_oop_map_count =
3486 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3487 first_nonstatic_oop_offset);
3489 // Compute reference type
3490 ReferenceType rt;
3491 if (super_klass() == NULL) {
3492 rt = REF_NONE;
3493 } else {
3494 rt = super_klass->reference_type();
3495 }
3497 // We can now create the basic klassOop for this klass
3498 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3499 static_field_size,
3500 total_oop_map_count,
3501 rt, CHECK_(nullHandle));
3502 instanceKlassHandle this_klass (THREAD, ik);
3504 assert(this_klass->static_field_size() == static_field_size, "sanity");
3505 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3506 "sanity");
3508 // Fill in information already parsed
3509 this_klass->set_access_flags(access_flags);
3510 this_klass->set_should_verify_class(verify);
3511 jint lh = Klass::instance_layout_helper(instance_size, false);
3512 this_klass->set_layout_helper(lh);
3513 assert(this_klass->oop_is_instance(), "layout is correct");
3514 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3515 // Not yet: supers are done below to support the new subtype-checking fields
3516 //this_klass->set_super(super_klass());
3517 this_klass->set_class_loader(class_loader());
3518 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3519 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3520 this_klass->set_static_oop_field_count(fac.static_oop_count);
3521 cp->set_pool_holder(this_klass());
3522 error_handler.set_in_error(false); // turn off error handler for cp
3523 this_klass->set_constants(cp());
3524 this_klass->set_local_interfaces(local_interfaces());
3525 this_klass->set_fields(fields());
3526 this_klass->set_methods(methods());
3527 if (has_final_method) {
3528 this_klass->set_has_final_method();
3529 }
3530 this_klass->set_method_ordering(method_ordering());
3531 // The instanceKlass::_methods_jmethod_ids cache and the
3532 // instanceKlass::_methods_cached_itable_indices cache are
3533 // both managed on the assumption that the initial cache
3534 // size is equal to the number of methods in the class. If
3535 // that changes, then instanceKlass::idnum_can_increment()
3536 // has to be changed accordingly.
3537 this_klass->set_initial_method_idnum(methods->length());
3538 this_klass->set_name(cp->klass_name_at(this_class_index));
3539 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3540 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3541 this_klass->set_protection_domain(protection_domain());
3542 this_klass->set_fields_annotations(fields_annotations());
3543 this_klass->set_methods_annotations(methods_annotations());
3544 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3545 this_klass->set_methods_default_annotations(methods_default_annotations());
3547 this_klass->set_minor_version(minor_version);
3548 this_klass->set_major_version(major_version);
3550 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3551 // (We used to do this lazily, but now we query it in Rewriter,
3552 // which is eagerly done for every method, so we might as well do it now,
3553 // when everything is fresh in memory.)
3554 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3555 for (int j = 0; j < methods->length(); j++) {
3556 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3557 }
3558 }
3560 if (cached_class_file_bytes != NULL) {
3561 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3562 this_klass->set_cached_class_file(cached_class_file_bytes,
3563 cached_class_file_length);
3564 }
3566 // Miranda methods
3567 if ((num_miranda_methods > 0) ||
3568 // if this class introduced new miranda methods or
3569 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3570 // super class exists and this class inherited miranda methods
3571 ) {
3572 this_klass->set_has_miranda_methods(); // then set a flag
3573 }
3575 // Additional attributes
3576 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3578 // Make sure this is the end of class file stream
3579 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3581 // VerifyOops believes that once this has been set, the object is completely loaded.
3582 // Compute transitive closure of interfaces this class implements
3583 this_klass->set_transitive_interfaces(transitive_interfaces());
3585 // Fill in information needed to compute superclasses.
3586 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3588 // Initialize itable offset tables
3589 klassItable::setup_itable_offset_table(this_klass);
3591 // Do final class setup
3592 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3594 set_precomputed_flags(this_klass);
3596 // reinitialize modifiers, using the InnerClasses attribute
3597 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3598 this_klass->set_modifier_flags(computed_modifiers);
3600 // check if this class can access its super class
3601 check_super_class_access(this_klass, CHECK_(nullHandle));
3603 // check if this class can access its superinterfaces
3604 check_super_interface_access(this_klass, CHECK_(nullHandle));
3606 // check if this class overrides any final method
3607 check_final_method_override(this_klass, CHECK_(nullHandle));
3609 // check that if this class is an interface then it doesn't have static methods
3610 if (this_klass->is_interface()) {
3611 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3612 }
3614 // Allocate mirror and initialize static fields
3615 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3617 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3618 false /* not shared class */);
3620 if (TraceClassLoading) {
3621 // print in a single call to reduce interleaving of output
3622 if (cfs->source() != NULL) {
3623 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3624 cfs->source());
3625 } else if (class_loader.is_null()) {
3626 if (THREAD->is_Java_thread()) {
3627 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3628 tty->print("[Loaded %s by instance of %s]\n",
3629 this_klass->external_name(),
3630 instanceKlass::cast(caller)->external_name());
3631 } else {
3632 tty->print("[Loaded %s]\n", this_klass->external_name());
3633 }
3634 } else {
3635 ResourceMark rm;
3636 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3637 instanceKlass::cast(class_loader->klass())->external_name());
3638 }
3639 }
3641 if (TraceClassResolution) {
3642 // print out the superclass.
3643 const char * from = Klass::cast(this_klass())->external_name();
3644 if (this_klass->java_super() != NULL) {
3645 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3646 }
3647 // print out each of the interface classes referred to by this class.
3648 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3649 if (!local_interfaces.is_null()) {
3650 int length = local_interfaces->length();
3651 for (int i = 0; i < length; i++) {
3652 klassOop k = klassOop(local_interfaces->obj_at(i));
3653 instanceKlass* to_class = instanceKlass::cast(k);
3654 const char * to = to_class->external_name();
3655 tty->print("RESOLVE %s %s (interface)\n", from, to);
3656 }
3657 }
3658 }
3660 #ifndef PRODUCT
3661 if( PrintCompactFieldsSavings ) {
3662 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3663 tty->print("[Saved %d of %d bytes in %s]\n",
3664 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3665 orig_nonstatic_field_size*heapOopSize,
3666 this_klass->external_name());
3667 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3668 tty->print("[Wasted %d over %d bytes in %s]\n",
3669 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3670 orig_nonstatic_field_size*heapOopSize,
3671 this_klass->external_name());
3672 }
3673 }
3674 #endif
3676 // preserve result across HandleMark
3677 preserve_this_klass = this_klass();
3678 }
3680 // Create new handle outside HandleMark
3681 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3682 debug_only(this_klass->as_klassOop()->verify();)
3684 return this_klass;
3685 }
3688 unsigned int
3689 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3690 unsigned int nonstatic_oop_map_count,
3691 int first_nonstatic_oop_offset) {
3692 unsigned int map_count =
3693 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3694 if (nonstatic_oop_map_count > 0) {
3695 // We have oops to add to map
3696 if (map_count == 0) {
3697 map_count = nonstatic_oop_map_count;
3698 } else {
3699 // Check whether we should add a new map block or whether the last one can
3700 // be extended
3701 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3702 OopMapBlock* const last_map = first_map + map_count - 1;
3704 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3705 if (next_offset == first_nonstatic_oop_offset) {
3706 // There is no gap bettwen superklass's last oop field and first
3707 // local oop field, merge maps.
3708 nonstatic_oop_map_count -= 1;
3709 } else {
3710 // Superklass didn't end with a oop field, add extra maps
3711 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3712 }
3713 map_count += nonstatic_oop_map_count;
3714 }
3715 }
3716 return map_count;
3717 }
3720 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3721 unsigned int nonstatic_oop_map_count,
3722 int* nonstatic_oop_offsets,
3723 unsigned int* nonstatic_oop_counts) {
3724 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3725 const instanceKlass* const super = k->superklass();
3726 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3727 if (super_count > 0) {
3728 // Copy maps from superklass
3729 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3730 for (unsigned int i = 0; i < super_count; ++i) {
3731 *this_oop_map++ = *super_oop_map++;
3732 }
3733 }
3735 if (nonstatic_oop_map_count > 0) {
3736 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3737 // The counts differ because there is no gap between superklass's last oop
3738 // field and the first local oop field. Extend the last oop map copied
3739 // from the superklass instead of creating new one.
3740 nonstatic_oop_map_count--;
3741 nonstatic_oop_offsets++;
3742 this_oop_map--;
3743 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3744 this_oop_map++;
3745 }
3747 // Add new map blocks, fill them
3748 while (nonstatic_oop_map_count-- > 0) {
3749 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3750 this_oop_map->set_count(*nonstatic_oop_counts++);
3751 this_oop_map++;
3752 }
3753 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3754 this_oop_map, "sanity");
3755 }
3756 }
3759 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3760 klassOop super = k->super();
3762 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3763 // in which case we don't have to register objects as finalizable
3764 if (!_has_empty_finalizer) {
3765 if (_has_finalizer ||
3766 (super != NULL && super->klass_part()->has_finalizer())) {
3767 k->set_has_finalizer();
3768 }
3769 }
3771 #ifdef ASSERT
3772 bool f = false;
3773 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3774 vmSymbols::void_method_signature());
3775 if (m != NULL && !m->is_empty_method()) {
3776 f = true;
3777 }
3778 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3779 #endif
3781 // Check if this klass supports the java.lang.Cloneable interface
3782 if (SystemDictionary::Cloneable_klass_loaded()) {
3783 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3784 k->set_is_cloneable();
3785 }
3786 }
3788 // Check if this klass has a vanilla default constructor
3789 if (super == NULL) {
3790 // java.lang.Object has empty default constructor
3791 k->set_has_vanilla_constructor();
3792 } else {
3793 if (Klass::cast(super)->has_vanilla_constructor() &&
3794 _has_vanilla_constructor) {
3795 k->set_has_vanilla_constructor();
3796 }
3797 #ifdef ASSERT
3798 bool v = false;
3799 if (Klass::cast(super)->has_vanilla_constructor()) {
3800 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3801 ), vmSymbols::void_method_signature());
3802 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3803 v = true;
3804 }
3805 }
3806 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3807 #endif
3808 }
3810 // If it cannot be fast-path allocated, set a bit in the layout helper.
3811 // See documentation of instanceKlass::can_be_fastpath_allocated().
3812 assert(k->size_helper() > 0, "layout_helper is initialized");
3813 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3814 || k->is_abstract() || k->is_interface()
3815 || (k->name() == vmSymbols::java_lang_Class()
3816 && k->class_loader() == NULL)
3817 || k->size_helper() >= FastAllocateSizeLimit) {
3818 // Forbid fast-path allocation.
3819 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3820 k->set_layout_helper(lh);
3821 }
3822 }
3825 // utility method for appending and array with check for duplicates
3827 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3828 // iterate over new interfaces
3829 for (int i = 0; i < ifs->length(); i++) {
3830 oop e = ifs->obj_at(i);
3831 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3832 // check for duplicates
3833 bool duplicate = false;
3834 for (int j = 0; j < index; j++) {
3835 if (result->obj_at(j) == e) {
3836 duplicate = true;
3837 break;
3838 }
3839 }
3840 // add new interface
3841 if (!duplicate) {
3842 result->obj_at_put(index++, e);
3843 }
3844 }
3845 }
3847 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3848 // Compute maximum size for transitive interfaces
3849 int max_transitive_size = 0;
3850 int super_size = 0;
3851 // Add superclass transitive interfaces size
3852 if (super.not_null()) {
3853 super_size = super->transitive_interfaces()->length();
3854 max_transitive_size += super_size;
3855 }
3856 // Add local interfaces' super interfaces
3857 int local_size = local_ifs->length();
3858 for (int i = 0; i < local_size; i++) {
3859 klassOop l = klassOop(local_ifs->obj_at(i));
3860 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3861 }
3862 // Finally add local interfaces
3863 max_transitive_size += local_size;
3864 // Construct array
3865 objArrayHandle result;
3866 if (max_transitive_size == 0) {
3867 // no interfaces, use canonicalized array
3868 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3869 } else if (max_transitive_size == super_size) {
3870 // no new local interfaces added, share superklass' transitive interface array
3871 result = objArrayHandle(THREAD, super->transitive_interfaces());
3872 } else if (max_transitive_size == local_size) {
3873 // only local interfaces added, share local interface array
3874 result = local_ifs;
3875 } else {
3876 objArrayHandle nullHandle;
3877 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3878 result = objArrayHandle(THREAD, new_objarray);
3879 int index = 0;
3880 // Copy down from superclass
3881 if (super.not_null()) {
3882 append_interfaces(result, index, super->transitive_interfaces());
3883 }
3884 // Copy down from local interfaces' superinterfaces
3885 for (int i = 0; i < local_ifs->length(); i++) {
3886 klassOop l = klassOop(local_ifs->obj_at(i));
3887 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3888 }
3889 // Finally add local interfaces
3890 append_interfaces(result, index, local_ifs());
3892 // Check if duplicates were removed
3893 if (index != max_transitive_size) {
3894 assert(index < max_transitive_size, "just checking");
3895 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3896 for (int i = 0; i < index; i++) {
3897 oop e = result->obj_at(i);
3898 assert(e != NULL, "just checking");
3899 new_result->obj_at_put(i, e);
3900 }
3901 result = objArrayHandle(THREAD, new_result);
3902 }
3903 }
3904 return result;
3905 }
3908 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3909 klassOop super = this_klass->super();
3910 if ((super != NULL) &&
3911 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3912 ResourceMark rm(THREAD);
3913 Exceptions::fthrow(
3914 THREAD_AND_LOCATION,
3915 vmSymbols::java_lang_IllegalAccessError(),
3916 "class %s cannot access its superclass %s",
3917 this_klass->external_name(),
3918 instanceKlass::cast(super)->external_name()
3919 );
3920 return;
3921 }
3922 }
3925 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3926 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3927 int lng = local_interfaces->length();
3928 for (int i = lng - 1; i >= 0; i--) {
3929 klassOop k = klassOop(local_interfaces->obj_at(i));
3930 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3931 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3932 ResourceMark rm(THREAD);
3933 Exceptions::fthrow(
3934 THREAD_AND_LOCATION,
3935 vmSymbols::java_lang_IllegalAccessError(),
3936 "class %s cannot access its superinterface %s",
3937 this_klass->external_name(),
3938 instanceKlass::cast(k)->external_name()
3939 );
3940 return;
3941 }
3942 }
3943 }
3946 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3947 objArrayHandle methods (THREAD, this_klass->methods());
3948 int num_methods = methods->length();
3950 // go thru each method and check if it overrides a final method
3951 for (int index = 0; index < num_methods; index++) {
3952 methodOop m = (methodOop)methods->obj_at(index);
3954 // skip private, static and <init> methods
3955 if ((!m->is_private()) &&
3956 (!m->is_static()) &&
3957 (m->name() != vmSymbols::object_initializer_name())) {
3959 Symbol* name = m->name();
3960 Symbol* signature = m->signature();
3961 klassOop k = this_klass->super();
3962 methodOop super_m = NULL;
3963 while (k != NULL) {
3964 // skip supers that don't have final methods.
3965 if (k->klass_part()->has_final_method()) {
3966 // lookup a matching method in the super class hierarchy
3967 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3968 if (super_m == NULL) {
3969 break; // didn't find any match; get out
3970 }
3972 if (super_m->is_final() &&
3973 // matching method in super is final
3974 (Reflection::verify_field_access(this_klass->as_klassOop(),
3975 super_m->method_holder(),
3976 super_m->method_holder(),
3977 super_m->access_flags(), false))
3978 // this class can access super final method and therefore override
3979 ) {
3980 ResourceMark rm(THREAD);
3981 Exceptions::fthrow(
3982 THREAD_AND_LOCATION,
3983 vmSymbols::java_lang_VerifyError(),
3984 "class %s overrides final method %s.%s",
3985 this_klass->external_name(),
3986 name->as_C_string(),
3987 signature->as_C_string()
3988 );
3989 return;
3990 }
3992 // continue to look from super_m's holder's super.
3993 k = instanceKlass::cast(super_m->method_holder())->super();
3994 continue;
3995 }
3997 k = k->klass_part()->super();
3998 }
3999 }
4000 }
4001 }
4004 // assumes that this_klass is an interface
4005 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4006 assert(this_klass->is_interface(), "not an interface");
4007 objArrayHandle methods (THREAD, this_klass->methods());
4008 int num_methods = methods->length();
4010 for (int index = 0; index < num_methods; index++) {
4011 methodOop m = (methodOop)methods->obj_at(index);
4012 // if m is static and not the init method, throw a verify error
4013 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4014 ResourceMark rm(THREAD);
4015 Exceptions::fthrow(
4016 THREAD_AND_LOCATION,
4017 vmSymbols::java_lang_VerifyError(),
4018 "Illegal static method %s in interface %s",
4019 m->name()->as_C_string(),
4020 this_klass->external_name()
4021 );
4022 return;
4023 }
4024 }
4025 }
4027 // utility methods for format checking
4029 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4030 if (!_need_verify) { return; }
4032 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4033 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4034 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4035 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4036 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4037 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4038 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4040 if ((is_abstract && is_final) ||
4041 (is_interface && !is_abstract) ||
4042 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4043 (!is_interface && major_gte_15 && is_annotation)) {
4044 ResourceMark rm(THREAD);
4045 Exceptions::fthrow(
4046 THREAD_AND_LOCATION,
4047 vmSymbols::java_lang_ClassFormatError(),
4048 "Illegal class modifiers in class %s: 0x%X",
4049 _class_name->as_C_string(), flags
4050 );
4051 return;
4052 }
4053 }
4055 bool ClassFileParser::has_illegal_visibility(jint flags) {
4056 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4057 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4058 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4060 return ((is_public && is_protected) ||
4061 (is_public && is_private) ||
4062 (is_protected && is_private));
4063 }
4065 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4066 u2 max_version =
4067 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4068 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4069 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4070 (major <= max_version) &&
4071 ((major != max_version) ||
4072 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4073 }
4075 void ClassFileParser::verify_legal_field_modifiers(
4076 jint flags, bool is_interface, TRAPS) {
4077 if (!_need_verify) { return; }
4079 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4080 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4081 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4082 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4083 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4084 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4085 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4086 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4087 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4089 bool is_illegal = false;
4091 if (is_interface) {
4092 if (!is_public || !is_static || !is_final || is_private ||
4093 is_protected || is_volatile || is_transient ||
4094 (major_gte_15 && is_enum)) {
4095 is_illegal = true;
4096 }
4097 } else { // not interface
4098 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4099 is_illegal = true;
4100 }
4101 }
4103 if (is_illegal) {
4104 ResourceMark rm(THREAD);
4105 Exceptions::fthrow(
4106 THREAD_AND_LOCATION,
4107 vmSymbols::java_lang_ClassFormatError(),
4108 "Illegal field modifiers in class %s: 0x%X",
4109 _class_name->as_C_string(), flags);
4110 return;
4111 }
4112 }
4114 void ClassFileParser::verify_legal_method_modifiers(
4115 jint flags, bool is_interface, Symbol* name, TRAPS) {
4116 if (!_need_verify) { return; }
4118 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4119 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4120 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4121 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4122 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4123 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4124 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4125 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4126 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4127 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4128 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4130 bool is_illegal = false;
4132 if (is_interface) {
4133 if (!is_abstract || !is_public || is_static || is_final ||
4134 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4135 is_illegal = true;
4136 }
4137 } else { // not interface
4138 if (is_initializer) {
4139 if (is_static || is_final || is_synchronized || is_native ||
4140 is_abstract || (major_gte_15 && is_bridge)) {
4141 is_illegal = true;
4142 }
4143 } else { // not initializer
4144 if (is_abstract) {
4145 if ((is_final || is_native || is_private || is_static ||
4146 (major_gte_15 && (is_synchronized || is_strict)))) {
4147 is_illegal = true;
4148 }
4149 }
4150 if (has_illegal_visibility(flags)) {
4151 is_illegal = true;
4152 }
4153 }
4154 }
4156 if (is_illegal) {
4157 ResourceMark rm(THREAD);
4158 Exceptions::fthrow(
4159 THREAD_AND_LOCATION,
4160 vmSymbols::java_lang_ClassFormatError(),
4161 "Method %s in class %s has illegal modifiers: 0x%X",
4162 name->as_C_string(), _class_name->as_C_string(), flags);
4163 return;
4164 }
4165 }
4167 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4168 assert(_need_verify, "only called when _need_verify is true");
4169 int i = 0;
4170 int count = length >> 2;
4171 for (int k=0; k<count; k++) {
4172 unsigned char b0 = buffer[i];
4173 unsigned char b1 = buffer[i+1];
4174 unsigned char b2 = buffer[i+2];
4175 unsigned char b3 = buffer[i+3];
4176 // For an unsigned char v,
4177 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4178 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4179 unsigned char res = b0 | b0 - 1 |
4180 b1 | b1 - 1 |
4181 b2 | b2 - 1 |
4182 b3 | b3 - 1;
4183 if (res >= 128) break;
4184 i += 4;
4185 }
4186 for(; i < length; i++) {
4187 unsigned short c;
4188 // no embedded zeros
4189 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4190 if(buffer[i] < 128) {
4191 continue;
4192 }
4193 if ((i + 5) < length) { // see if it's legal supplementary character
4194 if (UTF8::is_supplementary_character(&buffer[i])) {
4195 c = UTF8::get_supplementary_character(&buffer[i]);
4196 i += 5;
4197 continue;
4198 }
4199 }
4200 switch (buffer[i] >> 4) {
4201 default: break;
4202 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4203 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4204 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4205 c = (buffer[i] & 0x1F) << 6;
4206 i++;
4207 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4208 c += buffer[i] & 0x3F;
4209 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4210 // for classes with major > 47, c must a null or a character in its shortest form
4211 break;
4212 }
4213 }
4214 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4215 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4216 c = (buffer[i] & 0xF) << 12;
4217 i += 2;
4218 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4219 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4220 if (_major_version <= 47 || c >= 0x800) {
4221 // for classes with major > 47, c must be in its shortest form
4222 break;
4223 }
4224 }
4225 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4226 } // end of switch
4227 } // end of for
4228 }
4230 // Checks if name is a legal class name.
4231 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4232 if (!_need_verify || _relax_verify) { return; }
4234 char buf[fixed_buffer_size];
4235 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4236 unsigned int length = name->utf8_length();
4237 bool legal = false;
4239 if (length > 0) {
4240 char* p;
4241 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4242 p = skip_over_field_signature(bytes, false, length, CHECK);
4243 legal = (p != NULL) && ((p - bytes) == (int)length);
4244 } else if (_major_version < JAVA_1_5_VERSION) {
4245 if (bytes[0] != '<') {
4246 p = skip_over_field_name(bytes, true, length);
4247 legal = (p != NULL) && ((p - bytes) == (int)length);
4248 }
4249 } else {
4250 // 4900761: relax the constraints based on JSR202 spec
4251 // Class names may be drawn from the entire Unicode character set.
4252 // Identifiers between '/' must be unqualified names.
4253 // The utf8 string has been verified when parsing cpool entries.
4254 legal = verify_unqualified_name(bytes, length, LegalClass);
4255 }
4256 }
4257 if (!legal) {
4258 ResourceMark rm(THREAD);
4259 Exceptions::fthrow(
4260 THREAD_AND_LOCATION,
4261 vmSymbols::java_lang_ClassFormatError(),
4262 "Illegal class name \"%s\" in class file %s", bytes,
4263 _class_name->as_C_string()
4264 );
4265 return;
4266 }
4267 }
4269 // Checks if name is a legal field name.
4270 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4271 if (!_need_verify || _relax_verify) { return; }
4273 char buf[fixed_buffer_size];
4274 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4275 unsigned int length = name->utf8_length();
4276 bool legal = false;
4278 if (length > 0) {
4279 if (_major_version < JAVA_1_5_VERSION) {
4280 if (bytes[0] != '<') {
4281 char* p = skip_over_field_name(bytes, false, length);
4282 legal = (p != NULL) && ((p - bytes) == (int)length);
4283 }
4284 } else {
4285 // 4881221: relax the constraints based on JSR202 spec
4286 legal = verify_unqualified_name(bytes, length, LegalField);
4287 }
4288 }
4290 if (!legal) {
4291 ResourceMark rm(THREAD);
4292 Exceptions::fthrow(
4293 THREAD_AND_LOCATION,
4294 vmSymbols::java_lang_ClassFormatError(),
4295 "Illegal field name \"%s\" in class %s", bytes,
4296 _class_name->as_C_string()
4297 );
4298 return;
4299 }
4300 }
4302 // Checks if name is a legal method name.
4303 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4304 if (!_need_verify || _relax_verify) { return; }
4306 assert(name != NULL, "method name is null");
4307 char buf[fixed_buffer_size];
4308 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4309 unsigned int length = name->utf8_length();
4310 bool legal = false;
4312 if (length > 0) {
4313 if (bytes[0] == '<') {
4314 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4315 legal = true;
4316 }
4317 } else if (_major_version < JAVA_1_5_VERSION) {
4318 char* p;
4319 p = skip_over_field_name(bytes, false, length);
4320 legal = (p != NULL) && ((p - bytes) == (int)length);
4321 } else {
4322 // 4881221: relax the constraints based on JSR202 spec
4323 legal = verify_unqualified_name(bytes, length, LegalMethod);
4324 }
4325 }
4327 if (!legal) {
4328 ResourceMark rm(THREAD);
4329 Exceptions::fthrow(
4330 THREAD_AND_LOCATION,
4331 vmSymbols::java_lang_ClassFormatError(),
4332 "Illegal method name \"%s\" in class %s", bytes,
4333 _class_name->as_C_string()
4334 );
4335 return;
4336 }
4337 }
4340 // Checks if signature is a legal field signature.
4341 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4342 if (!_need_verify) { return; }
4344 char buf[fixed_buffer_size];
4345 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4346 unsigned int length = signature->utf8_length();
4347 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4349 if (p == NULL || (p - bytes) != (int)length) {
4350 throwIllegalSignature("Field", name, signature, CHECK);
4351 }
4352 }
4354 // Checks if signature is a legal method signature.
4355 // Returns number of parameters
4356 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4357 if (!_need_verify) {
4358 // make sure caller's args_size will be less than 0 even for non-static
4359 // method so it will be recomputed in compute_size_of_parameters().
4360 return -2;
4361 }
4363 unsigned int args_size = 0;
4364 char buf[fixed_buffer_size];
4365 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4366 unsigned int length = signature->utf8_length();
4367 char* nextp;
4369 // The first character must be a '('
4370 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4371 length--;
4372 // Skip over legal field signatures
4373 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4374 while ((length > 0) && (nextp != NULL)) {
4375 args_size++;
4376 if (p[0] == 'J' || p[0] == 'D') {
4377 args_size++;
4378 }
4379 length -= nextp - p;
4380 p = nextp;
4381 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4382 }
4383 // The first non-signature thing better be a ')'
4384 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4385 length--;
4386 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4387 // All internal methods must return void
4388 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4389 return args_size;
4390 }
4391 } else {
4392 // Now we better just have a return value
4393 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4394 if (nextp && ((int)length == (nextp - p))) {
4395 return args_size;
4396 }
4397 }
4398 }
4399 }
4400 // Report error
4401 throwIllegalSignature("Method", name, signature, CHECK_0);
4402 return 0;
4403 }
4406 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4407 // Method names also may not contain the characters '<' or '>', unless <init>
4408 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4409 // method. Because these names have been checked as special cases before
4410 // calling this method in verify_legal_method_name.
4411 bool ClassFileParser::verify_unqualified_name(
4412 char* name, unsigned int length, int type) {
4413 jchar ch;
4415 for (char* p = name; p != name + length; ) {
4416 ch = *p;
4417 if (ch < 128) {
4418 p++;
4419 if (ch == '.' || ch == ';' || ch == '[' ) {
4420 return false; // do not permit '.', ';', or '['
4421 }
4422 if (type != LegalClass && ch == '/') {
4423 return false; // do not permit '/' unless it's class name
4424 }
4425 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4426 return false; // do not permit '<' or '>' in method names
4427 }
4428 } else {
4429 char* tmp_p = UTF8::next(p, &ch);
4430 p = tmp_p;
4431 }
4432 }
4433 return true;
4434 }
4437 // Take pointer to a string. Skip over the longest part of the string that could
4438 // be taken as a fieldname. Allow '/' if slash_ok is true.
4439 // Return a pointer to just past the fieldname.
4440 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4441 // being true, we saw consecutive slashes (meaning we were looking for a
4442 // qualified path but found something that was badly-formed).
4443 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4444 char* p;
4445 jchar ch;
4446 jboolean last_is_slash = false;
4447 jboolean not_first_ch = false;
4449 for (p = name; p != name + length; not_first_ch = true) {
4450 char* old_p = p;
4451 ch = *p;
4452 if (ch < 128) {
4453 p++;
4454 // quick check for ascii
4455 if ((ch >= 'a' && ch <= 'z') ||
4456 (ch >= 'A' && ch <= 'Z') ||
4457 (ch == '_' || ch == '$') ||
4458 (not_first_ch && ch >= '0' && ch <= '9')) {
4459 last_is_slash = false;
4460 continue;
4461 }
4462 if (slash_ok && ch == '/') {
4463 if (last_is_slash) {
4464 return NULL; // Don't permit consecutive slashes
4465 }
4466 last_is_slash = true;
4467 continue;
4468 }
4469 } else {
4470 jint unicode_ch;
4471 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4472 p = tmp_p;
4473 last_is_slash = false;
4474 // Check if ch is Java identifier start or is Java identifier part
4475 // 4672820: call java.lang.Character methods directly without generating separate tables.
4476 EXCEPTION_MARK;
4477 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4479 // return value
4480 JavaValue result(T_BOOLEAN);
4481 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4482 JavaCallArguments args;
4483 args.push_int(unicode_ch);
4485 // public static boolean isJavaIdentifierStart(char ch);
4486 JavaCalls::call_static(&result,
4487 klass,
4488 vmSymbols::isJavaIdentifierStart_name(),
4489 vmSymbols::int_bool_signature(),
4490 &args,
4491 THREAD);
4493 if (HAS_PENDING_EXCEPTION) {
4494 CLEAR_PENDING_EXCEPTION;
4495 return 0;
4496 }
4497 if (result.get_jboolean()) {
4498 continue;
4499 }
4501 if (not_first_ch) {
4502 // public static boolean isJavaIdentifierPart(char ch);
4503 JavaCalls::call_static(&result,
4504 klass,
4505 vmSymbols::isJavaIdentifierPart_name(),
4506 vmSymbols::int_bool_signature(),
4507 &args,
4508 THREAD);
4510 if (HAS_PENDING_EXCEPTION) {
4511 CLEAR_PENDING_EXCEPTION;
4512 return 0;
4513 }
4515 if (result.get_jboolean()) {
4516 continue;
4517 }
4518 }
4519 }
4520 return (not_first_ch) ? old_p : NULL;
4521 }
4522 return (not_first_ch) ? p : NULL;
4523 }
4526 // Take pointer to a string. Skip over the longest part of the string that could
4527 // be taken as a field signature. Allow "void" if void_ok.
4528 // Return a pointer to just past the signature.
4529 // Return NULL if no legal signature is found.
4530 char* ClassFileParser::skip_over_field_signature(char* signature,
4531 bool void_ok,
4532 unsigned int length,
4533 TRAPS) {
4534 unsigned int array_dim = 0;
4535 while (length > 0) {
4536 switch (signature[0]) {
4537 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4538 case JVM_SIGNATURE_BOOLEAN:
4539 case JVM_SIGNATURE_BYTE:
4540 case JVM_SIGNATURE_CHAR:
4541 case JVM_SIGNATURE_SHORT:
4542 case JVM_SIGNATURE_INT:
4543 case JVM_SIGNATURE_FLOAT:
4544 case JVM_SIGNATURE_LONG:
4545 case JVM_SIGNATURE_DOUBLE:
4546 return signature + 1;
4547 case JVM_SIGNATURE_CLASS: {
4548 if (_major_version < JAVA_1_5_VERSION) {
4549 // Skip over the class name if one is there
4550 char* p = skip_over_field_name(signature + 1, true, --length);
4552 // The next character better be a semicolon
4553 if (p && (p - signature) > 1 && p[0] == ';') {
4554 return p + 1;
4555 }
4556 } else {
4557 // 4900761: For class version > 48, any unicode is allowed in class name.
4558 length--;
4559 signature++;
4560 while (length > 0 && signature[0] != ';') {
4561 if (signature[0] == '.') {
4562 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4563 }
4564 length--;
4565 signature++;
4566 }
4567 if (signature[0] == ';') { return signature + 1; }
4568 }
4570 return NULL;
4571 }
4572 case JVM_SIGNATURE_ARRAY:
4573 array_dim++;
4574 if (array_dim > 255) {
4575 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4576 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4577 }
4578 // The rest of what's there better be a legal signature
4579 signature++;
4580 length--;
4581 void_ok = false;
4582 break;
4584 default:
4585 return NULL;
4586 }
4587 }
4588 return NULL;
4589 }