Mon, 14 Jan 2013 15:17:47 +0100
8003985: Support @Contended Annotation - JEP 142
Summary: HotSpot changes to support @Contended annotation.
Reviewed-by: coleenp, kvn, jrose
Contributed-by: Aleksey Shipilev <aleksey.shipilev@oracle.com>
1 /*
2 * Copyright (c) 1997, 2013, 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/classLoaderData.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/genericSignatures.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/verificationType.hpp"
36 #include "classfile/verifier.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "memory/allocation.hpp"
39 #include "memory/gcLocker.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/instanceMirrorKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/klassVtable.hpp"
49 #include "oops/method.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm.h"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/perfData.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/classLoadingService.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/array.hpp"
63 // We generally try to create the oops directly when parsing, rather than
64 // allocating temporary data structures and copying the bytes twice. A
65 // temporary area is only needed when parsing utf8 entries in the constant
66 // pool and when parsing line number tables.
68 // We add assert in debug mode when class format is not checked.
70 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
71 #define JAVA_MIN_SUPPORTED_VERSION 45
72 #define JAVA_MAX_SUPPORTED_VERSION 52
73 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
75 // Used for two backward compatibility reasons:
76 // - to check for new additions to the class file format in JDK1.5
77 // - to check for bug fixes in the format checker in JDK1.5
78 #define JAVA_1_5_VERSION 49
80 // Used for backward compatibility reasons:
81 // - to check for javac bug fixes that happened after 1.5
82 // - also used as the max version when running in jdk6
83 #define JAVA_6_VERSION 50
85 // Used for backward compatibility reasons:
86 // - to check NameAndType_info signatures more aggressively
87 #define JAVA_7_VERSION 51
89 // Extension method support.
90 #define JAVA_8_VERSION 52
93 void ClassFileParser::parse_constant_pool_entries(ClassLoaderData* loader_data, constantPoolHandle cp, int length, TRAPS) {
94 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
95 // this function (_current can be allocated in a register, with scalar
96 // replacement of aggregates). The _current pointer is copied back to
97 // stream() when this function returns. DON'T call another method within
98 // this method that uses stream().
99 ClassFileStream* cfs0 = stream();
100 ClassFileStream cfs1 = *cfs0;
101 ClassFileStream* cfs = &cfs1;
102 #ifdef ASSERT
103 assert(cfs->allocated_on_stack(),"should be local");
104 u1* old_current = cfs0->current();
105 #endif
106 Handle class_loader(THREAD, loader_data->class_loader());
108 // Used for batching symbol allocations.
109 const char* names[SymbolTable::symbol_alloc_batch_size];
110 int lengths[SymbolTable::symbol_alloc_batch_size];
111 int indices[SymbolTable::symbol_alloc_batch_size];
112 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
113 int names_count = 0;
115 // parsing Index 0 is unused
116 for (int index = 1; index < length; index++) {
117 // Each of the following case guarantees one more byte in the stream
118 // for the following tag or the access_flags following constant pool,
119 // so we don't need bounds-check for reading tag.
120 u1 tag = cfs->get_u1_fast();
121 switch (tag) {
122 case JVM_CONSTANT_Class :
123 {
124 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
125 u2 name_index = cfs->get_u2_fast();
126 cp->klass_index_at_put(index, name_index);
127 }
128 break;
129 case JVM_CONSTANT_Fieldref :
130 {
131 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
132 u2 class_index = cfs->get_u2_fast();
133 u2 name_and_type_index = cfs->get_u2_fast();
134 cp->field_at_put(index, class_index, name_and_type_index);
135 }
136 break;
137 case JVM_CONSTANT_Methodref :
138 {
139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
140 u2 class_index = cfs->get_u2_fast();
141 u2 name_and_type_index = cfs->get_u2_fast();
142 cp->method_at_put(index, class_index, name_and_type_index);
143 }
144 break;
145 case JVM_CONSTANT_InterfaceMethodref :
146 {
147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
148 u2 class_index = cfs->get_u2_fast();
149 u2 name_and_type_index = cfs->get_u2_fast();
150 cp->interface_method_at_put(index, class_index, name_and_type_index);
151 }
152 break;
153 case JVM_CONSTANT_String :
154 {
155 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
156 u2 string_index = cfs->get_u2_fast();
157 cp->string_index_at_put(index, string_index);
158 }
159 break;
160 case JVM_CONSTANT_MethodHandle :
161 case JVM_CONSTANT_MethodType :
162 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
163 classfile_parse_error(
164 "Class file version does not support constant tag %u in class file %s",
165 tag, CHECK);
166 }
167 if (!EnableInvokeDynamic) {
168 classfile_parse_error(
169 "This JVM does not support constant tag %u in class file %s",
170 tag, CHECK);
171 }
172 if (tag == JVM_CONSTANT_MethodHandle) {
173 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
174 u1 ref_kind = cfs->get_u1_fast();
175 u2 method_index = cfs->get_u2_fast();
176 cp->method_handle_index_at_put(index, ref_kind, method_index);
177 } else if (tag == JVM_CONSTANT_MethodType) {
178 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
179 u2 signature_index = cfs->get_u2_fast();
180 cp->method_type_index_at_put(index, signature_index);
181 } else {
182 ShouldNotReachHere();
183 }
184 break;
185 case JVM_CONSTANT_InvokeDynamic :
186 {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (!EnableInvokeDynamic) {
193 classfile_parse_error(
194 "This JVM does not support constant tag %u in class file %s",
195 tag, CHECK);
196 }
197 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
198 u2 bootstrap_specifier_index = cfs->get_u2_fast();
199 u2 name_and_type_index = cfs->get_u2_fast();
200 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
201 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
202 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
203 }
204 break;
205 case JVM_CONSTANT_Integer :
206 {
207 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
208 u4 bytes = cfs->get_u4_fast();
209 cp->int_at_put(index, (jint) bytes);
210 }
211 break;
212 case JVM_CONSTANT_Float :
213 {
214 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
215 u4 bytes = cfs->get_u4_fast();
216 cp->float_at_put(index, *(jfloat*)&bytes);
217 }
218 break;
219 case JVM_CONSTANT_Long :
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->long_at_put(index, bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_Double :
232 // A mangled type might cause you to overrun allocated memory
233 guarantee_property(index+1 < length,
234 "Invalid constant pool entry %u in class file %s",
235 index, CHECK);
236 {
237 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
238 u8 bytes = cfs->get_u8_fast();
239 cp->double_at_put(index, *(jdouble*)&bytes);
240 }
241 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
242 break;
243 case JVM_CONSTANT_NameAndType :
244 {
245 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
246 u2 name_index = cfs->get_u2_fast();
247 u2 signature_index = cfs->get_u2_fast();
248 cp->name_and_type_at_put(index, name_index, signature_index);
249 }
250 break;
251 case JVM_CONSTANT_Utf8 :
252 {
253 cfs->guarantee_more(2, CHECK); // utf8_length
254 u2 utf8_length = cfs->get_u2_fast();
255 u1* utf8_buffer = cfs->get_u1_buffer();
256 assert(utf8_buffer != NULL, "null utf8 buffer");
257 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
258 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
259 cfs->skip_u1_fast(utf8_length);
261 // Before storing the symbol, make sure it's legal
262 if (_need_verify) {
263 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
264 }
266 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
267 Handle patch = clear_cp_patch_at(index);
268 guarantee_property(java_lang_String::is_instance(patch()),
269 "Illegal utf8 patch at %d in class file %s",
270 index, CHECK);
271 char* str = java_lang_String::as_utf8_string(patch());
272 // (could use java_lang_String::as_symbol instead, but might as well batch them)
273 utf8_buffer = (u1*) str;
274 utf8_length = (int) strlen(str);
275 }
277 unsigned int hash;
278 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
279 if (result == NULL) {
280 names[names_count] = (char*)utf8_buffer;
281 lengths[names_count] = utf8_length;
282 indices[names_count] = index;
283 hashValues[names_count++] = hash;
284 if (names_count == SymbolTable::symbol_alloc_batch_size) {
285 SymbolTable::new_symbols(loader_data, cp, names_count, names, lengths, indices, hashValues, CHECK);
286 names_count = 0;
287 }
288 } else {
289 cp->symbol_at_put(index, result);
290 }
291 }
292 break;
293 default:
294 classfile_parse_error(
295 "Unknown constant tag %u in class file %s", tag, CHECK);
296 break;
297 }
298 }
300 // Allocate the remaining symbols
301 if (names_count > 0) {
302 SymbolTable::new_symbols(loader_data, cp, names_count, names, lengths, indices, hashValues, CHECK);
303 }
305 // Copy _current pointer of local copy back to stream().
306 #ifdef ASSERT
307 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
308 #endif
309 cfs0->set_current(cfs1.current());
310 }
312 // This class unreferences constant pool symbols if an error has occurred
313 // while parsing the class before it is assigned into the class.
314 // If it gets an error after that it is unloaded and the constant pool will
315 // be cleaned up then.
316 class ConstantPoolCleaner : public StackObj {
317 constantPoolHandle _cphandle;
318 bool _in_error;
319 public:
320 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
321 ~ConstantPoolCleaner() {
322 if (_in_error && _cphandle.not_null()) {
323 _cphandle->unreference_symbols();
324 }
325 }
326 void set_in_error(bool clean) { _in_error = clean; }
327 };
329 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
331 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
332 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
333 return cp->symbol_at(index);
334 else
335 return NULL;
336 }
338 constantPoolHandle ClassFileParser::parse_constant_pool(ClassLoaderData* loader_data, TRAPS) {
339 ClassFileStream* cfs = stream();
340 constantPoolHandle nullHandle;
342 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
343 u2 length = cfs->get_u2_fast();
344 guarantee_property(
345 length >= 1, "Illegal constant pool size %u in class file %s",
346 length, CHECK_(nullHandle));
347 ConstantPool* constant_pool =
348 ConstantPool::allocate(loader_data,
349 length,
350 CHECK_(nullHandle));
351 constantPoolHandle cp (THREAD, constant_pool);
353 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
355 // parsing constant pool entries
356 parse_constant_pool_entries(loader_data, cp, length, CHECK_(nullHandle));
358 int index = 1; // declared outside of loops for portability
360 // first verification pass - validate cross references and fixup class and string constants
361 for (index = 1; index < length; index++) { // Index 0 is unused
362 jbyte tag = cp->tag_at(index).value();
363 switch (tag) {
364 case JVM_CONSTANT_Class :
365 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
366 break;
367 case JVM_CONSTANT_Fieldref :
368 // fall through
369 case JVM_CONSTANT_Methodref :
370 // fall through
371 case JVM_CONSTANT_InterfaceMethodref : {
372 if (!_need_verify) break;
373 int klass_ref_index = cp->klass_ref_index_at(index);
374 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
375 check_property(valid_cp_range(klass_ref_index, length) &&
376 is_klass_reference(cp, klass_ref_index),
377 "Invalid constant pool index %u in class file %s",
378 klass_ref_index,
379 CHECK_(nullHandle));
380 check_property(valid_cp_range(name_and_type_ref_index, length) &&
381 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
382 "Invalid constant pool index %u in class file %s",
383 name_and_type_ref_index,
384 CHECK_(nullHandle));
385 break;
386 }
387 case JVM_CONSTANT_String :
388 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
389 break;
390 case JVM_CONSTANT_Integer :
391 break;
392 case JVM_CONSTANT_Float :
393 break;
394 case JVM_CONSTANT_Long :
395 case JVM_CONSTANT_Double :
396 index++;
397 check_property(
398 (index < length && cp->tag_at(index).is_invalid()),
399 "Improper constant pool long/double index %u in class file %s",
400 index, CHECK_(nullHandle));
401 break;
402 case JVM_CONSTANT_NameAndType : {
403 if (!_need_verify) break;
404 int name_ref_index = cp->name_ref_index_at(index);
405 int signature_ref_index = cp->signature_ref_index_at(index);
406 check_property(
407 valid_cp_range(name_ref_index, length) &&
408 cp->tag_at(name_ref_index).is_utf8(),
409 "Invalid constant pool index %u in class file %s",
410 name_ref_index, CHECK_(nullHandle));
411 check_property(
412 valid_cp_range(signature_ref_index, length) &&
413 cp->tag_at(signature_ref_index).is_utf8(),
414 "Invalid constant pool index %u in class file %s",
415 signature_ref_index, CHECK_(nullHandle));
416 break;
417 }
418 case JVM_CONSTANT_Utf8 :
419 break;
420 case JVM_CONSTANT_UnresolvedClass : // fall-through
421 case JVM_CONSTANT_UnresolvedClassInError:
422 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
423 break;
424 case JVM_CONSTANT_ClassIndex :
425 {
426 int class_index = cp->klass_index_at(index);
427 check_property(
428 valid_cp_range(class_index, length) &&
429 cp->tag_at(class_index).is_utf8(),
430 "Invalid constant pool index %u in class file %s",
431 class_index, CHECK_(nullHandle));
432 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
433 }
434 break;
435 case JVM_CONSTANT_StringIndex :
436 {
437 int string_index = cp->string_index_at(index);
438 check_property(
439 valid_cp_range(string_index, length) &&
440 cp->tag_at(string_index).is_utf8(),
441 "Invalid constant pool index %u in class file %s",
442 string_index, CHECK_(nullHandle));
443 Symbol* sym = cp->symbol_at(string_index);
444 cp->unresolved_string_at_put(index, sym);
445 }
446 break;
447 case JVM_CONSTANT_MethodHandle :
448 {
449 int ref_index = cp->method_handle_index_at(index);
450 check_property(
451 valid_cp_range(ref_index, length) &&
452 EnableInvokeDynamic,
453 "Invalid constant pool index %u in class file %s",
454 ref_index, CHECK_(nullHandle));
455 constantTag tag = cp->tag_at(ref_index);
456 int ref_kind = cp->method_handle_ref_kind_at(index);
457 switch (ref_kind) {
458 case JVM_REF_getField:
459 case JVM_REF_getStatic:
460 case JVM_REF_putField:
461 case JVM_REF_putStatic:
462 check_property(
463 tag.is_field(),
464 "Invalid constant pool index %u in class file %s (not a field)",
465 ref_index, CHECK_(nullHandle));
466 break;
467 case JVM_REF_invokeVirtual:
468 case JVM_REF_invokeStatic:
469 case JVM_REF_invokeSpecial:
470 case JVM_REF_newInvokeSpecial:
471 check_property(
472 tag.is_method(),
473 "Invalid constant pool index %u in class file %s (not a method)",
474 ref_index, CHECK_(nullHandle));
475 break;
476 case JVM_REF_invokeInterface:
477 check_property(
478 tag.is_interface_method(),
479 "Invalid constant pool index %u in class file %s (not an interface method)",
480 ref_index, CHECK_(nullHandle));
481 break;
482 default:
483 classfile_parse_error(
484 "Bad method handle kind at constant pool index %u in class file %s",
485 index, CHECK_(nullHandle));
486 }
487 // Keep the ref_index unchanged. It will be indirected at link-time.
488 }
489 break;
490 case JVM_CONSTANT_MethodType :
491 {
492 int ref_index = cp->method_type_index_at(index);
493 check_property(
494 valid_cp_range(ref_index, length) &&
495 cp->tag_at(ref_index).is_utf8() &&
496 EnableInvokeDynamic,
497 "Invalid constant pool index %u in class file %s",
498 ref_index, CHECK_(nullHandle));
499 }
500 break;
501 case JVM_CONSTANT_InvokeDynamic :
502 {
503 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
504 check_property(valid_cp_range(name_and_type_ref_index, length) &&
505 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
506 "Invalid constant pool index %u in class file %s",
507 name_and_type_ref_index,
508 CHECK_(nullHandle));
509 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
510 break;
511 }
512 default:
513 fatal(err_msg("bad constant pool tag value %u",
514 cp->tag_at(index).value()));
515 ShouldNotReachHere();
516 break;
517 } // end of switch
518 } // end of for
520 if (_cp_patches != NULL) {
521 // need to treat this_class specially...
522 assert(EnableInvokeDynamic, "");
523 int this_class_index;
524 {
525 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
526 u1* mark = cfs->current();
527 u2 flags = cfs->get_u2_fast();
528 this_class_index = cfs->get_u2_fast();
529 cfs->set_current(mark); // revert to mark
530 }
532 for (index = 1; index < length; index++) { // Index 0 is unused
533 if (has_cp_patch_at(index)) {
534 guarantee_property(index != this_class_index,
535 "Illegal constant pool patch to self at %d in class file %s",
536 index, CHECK_(nullHandle));
537 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
538 }
539 }
540 }
542 if (!_need_verify) {
543 cp_in_error.set_in_error(false);
544 return cp;
545 }
547 // second verification pass - checks the strings are of the right format.
548 // but not yet to the other entries
549 for (index = 1; index < length; index++) {
550 jbyte tag = cp->tag_at(index).value();
551 switch (tag) {
552 case JVM_CONSTANT_UnresolvedClass: {
553 Symbol* class_name = cp->unresolved_klass_at(index);
554 // check the name, even if _cp_patches will overwrite it
555 verify_legal_class_name(class_name, CHECK_(nullHandle));
556 break;
557 }
558 case JVM_CONSTANT_NameAndType: {
559 if (_need_verify && _major_version >= JAVA_7_VERSION) {
560 int sig_index = cp->signature_ref_index_at(index);
561 int name_index = cp->name_ref_index_at(index);
562 Symbol* name = cp->symbol_at(name_index);
563 Symbol* sig = cp->symbol_at(sig_index);
564 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
565 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
566 } else {
567 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
568 }
569 }
570 break;
571 }
572 case JVM_CONSTANT_InvokeDynamic:
573 case JVM_CONSTANT_Fieldref:
574 case JVM_CONSTANT_Methodref:
575 case JVM_CONSTANT_InterfaceMethodref: {
576 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
577 // already verified to be utf8
578 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
579 // already verified to be utf8
580 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
581 Symbol* name = cp->symbol_at(name_ref_index);
582 Symbol* signature = cp->symbol_at(signature_ref_index);
583 if (tag == JVM_CONSTANT_Fieldref) {
584 verify_legal_field_name(name, CHECK_(nullHandle));
585 if (_need_verify && _major_version >= JAVA_7_VERSION) {
586 // Signature is verified above, when iterating NameAndType_info.
587 // Need only to be sure it's the right type.
588 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
589 throwIllegalSignature(
590 "Field", name, signature, CHECK_(nullHandle));
591 }
592 } else {
593 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
594 }
595 } else {
596 verify_legal_method_name(name, CHECK_(nullHandle));
597 if (_need_verify && _major_version >= JAVA_7_VERSION) {
598 // Signature is verified above, when iterating NameAndType_info.
599 // Need only to be sure it's the right type.
600 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
601 throwIllegalSignature(
602 "Method", name, signature, CHECK_(nullHandle));
603 }
604 } else {
605 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
606 }
607 if (tag == JVM_CONSTANT_Methodref) {
608 // 4509014: If a class method name begins with '<', it must be "<init>".
609 assert(name != NULL, "method name in constant pool is null");
610 unsigned int name_len = name->utf8_length();
611 assert(name_len > 0, "bad method name"); // already verified as legal name
612 if (name->byte_at(0) == '<') {
613 if (name != vmSymbols::object_initializer_name()) {
614 classfile_parse_error(
615 "Bad method name at constant pool index %u in class file %s",
616 name_ref_index, CHECK_(nullHandle));
617 }
618 }
619 }
620 }
621 break;
622 }
623 case JVM_CONSTANT_MethodHandle: {
624 int ref_index = cp->method_handle_index_at(index);
625 int ref_kind = cp->method_handle_ref_kind_at(index);
626 switch (ref_kind) {
627 case JVM_REF_invokeVirtual:
628 case JVM_REF_invokeStatic:
629 case JVM_REF_invokeSpecial:
630 case JVM_REF_newInvokeSpecial:
631 {
632 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
633 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
634 Symbol* name = cp->symbol_at(name_ref_index);
635 if (ref_kind == JVM_REF_newInvokeSpecial) {
636 if (name != vmSymbols::object_initializer_name()) {
637 classfile_parse_error(
638 "Bad constructor name at constant pool index %u in class file %s",
639 name_ref_index, CHECK_(nullHandle));
640 }
641 } else {
642 if (name == vmSymbols::object_initializer_name()) {
643 classfile_parse_error(
644 "Bad method name at constant pool index %u in class file %s",
645 name_ref_index, CHECK_(nullHandle));
646 }
647 }
648 }
649 break;
650 // Other ref_kinds are already fully checked in previous pass.
651 }
652 break;
653 }
654 case JVM_CONSTANT_MethodType: {
655 Symbol* no_name = vmSymbols::type_name(); // place holder
656 Symbol* signature = cp->method_type_signature_at(index);
657 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
658 break;
659 }
660 case JVM_CONSTANT_Utf8: {
661 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
662 }
663 } // end of switch
664 } // end of for
666 cp_in_error.set_in_error(false);
667 return cp;
668 }
671 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
672 assert(EnableInvokeDynamic, "");
673 BasicType patch_type = T_VOID;
675 switch (cp->tag_at(index).value()) {
677 case JVM_CONSTANT_UnresolvedClass :
678 // Patching a class means pre-resolving it.
679 // The name in the constant pool is ignored.
680 if (java_lang_Class::is_instance(patch())) {
681 guarantee_property(!java_lang_Class::is_primitive(patch()),
682 "Illegal class patch at %d in class file %s",
683 index, CHECK);
684 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
685 } else {
686 guarantee_property(java_lang_String::is_instance(patch()),
687 "Illegal class patch at %d in class file %s",
688 index, CHECK);
689 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
690 cp->unresolved_klass_at_put(index, name);
691 }
692 break;
694 case JVM_CONSTANT_String :
695 // skip this patch and don't clear it. Needs the oop array for resolved
696 // references to be created first.
697 return;
699 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
700 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
701 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
702 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
703 patch_prim:
704 {
705 jvalue value;
706 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
707 guarantee_property(value_type == patch_type,
708 "Illegal primitive patch at %d in class file %s",
709 index, CHECK);
710 switch (value_type) {
711 case T_INT: cp->int_at_put(index, value.i); break;
712 case T_FLOAT: cp->float_at_put(index, value.f); break;
713 case T_LONG: cp->long_at_put(index, value.j); break;
714 case T_DOUBLE: cp->double_at_put(index, value.d); break;
715 default: assert(false, "");
716 }
717 }
718 break;
720 default:
721 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
722 guarantee_property(!has_cp_patch_at(index),
723 "Illegal unexpected patch at %d in class file %s",
724 index, CHECK);
725 return;
726 }
728 // On fall-through, mark the patch as used.
729 clear_cp_patch_at(index);
730 }
734 class NameSigHash: public ResourceObj {
735 public:
736 Symbol* _name; // name
737 Symbol* _sig; // signature
738 NameSigHash* _next; // Next entry in hash table
739 };
742 #define HASH_ROW_SIZE 256
744 unsigned int hash(Symbol* name, Symbol* sig) {
745 unsigned int raw_hash = 0;
746 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
747 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
749 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
750 }
753 void initialize_hashtable(NameSigHash** table) {
754 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
755 }
757 // Return false if the name/sig combination is found in table.
758 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
759 // The old format checker uses heap sort to find duplicates.
760 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
761 // of table since we don't expect Symbol*'s to move.
762 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
763 assert(name != NULL, "name in constant pool is NULL");
765 // First lookup for duplicates
766 int index = hash(name, sig);
767 NameSigHash* entry = table[index];
768 while (entry != NULL) {
769 if (entry->_name == name && entry->_sig == sig) {
770 return false;
771 }
772 entry = entry->_next;
773 }
775 // No duplicate is found, allocate a new entry and fill it.
776 entry = new NameSigHash();
777 entry->_name = name;
778 entry->_sig = sig;
780 // Insert into hash table
781 entry->_next = table[index];
782 table[index] = entry;
784 return true;
785 }
788 Array<Klass*>* ClassFileParser::parse_interfaces(constantPoolHandle cp,
789 int length,
790 ClassLoaderData* loader_data,
791 Handle protection_domain,
792 Symbol* class_name,
793 bool* has_default_methods,
794 TRAPS) {
795 ClassFileStream* cfs = stream();
796 assert(length > 0, "only called for length>0");
797 // FIXME: Leak at later OOM.
798 Array<Klass*>* interfaces = MetadataFactory::new_array<Klass*>(loader_data, length, NULL, CHECK_NULL);
800 int index;
801 for (index = 0; index < length; index++) {
802 u2 interface_index = cfs->get_u2(CHECK_NULL);
803 KlassHandle interf;
804 check_property(
805 valid_cp_range(interface_index, cp->length()) &&
806 is_klass_reference(cp, interface_index),
807 "Interface name has bad constant pool index %u in class file %s",
808 interface_index, CHECK_NULL);
809 if (cp->tag_at(interface_index).is_klass()) {
810 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
811 } else {
812 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
814 // Don't need to check legal name because it's checked when parsing constant pool.
815 // But need to make sure it's not an array type.
816 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
817 "Bad interface name in class file %s", CHECK_NULL);
818 Handle class_loader(THREAD, loader_data->class_loader());
820 // Call resolve_super so classcircularity is checked
821 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
822 unresolved_klass, class_loader, protection_domain,
823 false, CHECK_NULL);
824 interf = KlassHandle(THREAD, k);
825 }
827 if (!interf()->is_interface()) {
828 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
829 }
830 if (InstanceKlass::cast(interf())->has_default_methods()) {
831 *has_default_methods = true;
832 }
833 interfaces->at_put(index, interf());
834 }
836 if (!_need_verify || length <= 1) {
837 return interfaces;
838 }
840 // Check if there's any duplicates in interfaces
841 ResourceMark rm(THREAD);
842 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
843 THREAD, NameSigHash*, HASH_ROW_SIZE);
844 initialize_hashtable(interface_names);
845 bool dup = false;
846 {
847 debug_only(No_Safepoint_Verifier nsv;)
848 for (index = 0; index < length; index++) {
849 Klass* k = interfaces->at(index);
850 Symbol* name = InstanceKlass::cast(k)->name();
851 // If no duplicates, add (name, NULL) in hashtable interface_names.
852 if (!put_after_lookup(name, NULL, interface_names)) {
853 dup = true;
854 break;
855 }
856 }
857 }
858 if (dup) {
859 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
860 }
862 return interfaces;
863 }
866 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
867 // Make sure the constant pool entry is of a type appropriate to this field
868 guarantee_property(
869 (constantvalue_index > 0 &&
870 constantvalue_index < cp->length()),
871 "Bad initial value index %u in ConstantValue attribute in class file %s",
872 constantvalue_index, CHECK);
873 constantTag value_type = cp->tag_at(constantvalue_index);
874 switch ( cp->basic_type_for_signature_at(signature_index) ) {
875 case T_LONG:
876 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
877 break;
878 case T_FLOAT:
879 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
880 break;
881 case T_DOUBLE:
882 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
883 break;
884 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
885 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
886 break;
887 case T_OBJECT:
888 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
889 && value_type.is_string()),
890 "Bad string initial value in class file %s", CHECK);
891 break;
892 default:
893 classfile_parse_error(
894 "Unable to set initial value %u in class file %s",
895 constantvalue_index, CHECK);
896 }
897 }
900 // Parse attributes for a field.
901 void ClassFileParser::parse_field_attributes(ClassLoaderData* loader_data,
902 constantPoolHandle cp,
903 u2 attributes_count,
904 bool is_static, u2 signature_index,
905 u2* constantvalue_index_addr,
906 bool* is_synthetic_addr,
907 u2* generic_signature_index_addr,
908 AnnotationArray** field_annotations,
909 AnnotationArray** field_type_annotations,
910 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
911 TRAPS) {
912 ClassFileStream* cfs = stream();
913 assert(attributes_count > 0, "length should be greater than 0");
914 u2 constantvalue_index = 0;
915 u2 generic_signature_index = 0;
916 bool is_synthetic = false;
917 u1* runtime_visible_annotations = NULL;
918 int runtime_visible_annotations_length = 0;
919 u1* runtime_invisible_annotations = NULL;
920 int runtime_invisible_annotations_length = 0;
921 u1* runtime_visible_type_annotations = NULL;
922 int runtime_visible_type_annotations_length = 0;
923 u1* runtime_invisible_type_annotations = NULL;
924 int runtime_invisible_type_annotations_length = 0;
925 while (attributes_count--) {
926 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
927 u2 attribute_name_index = cfs->get_u2_fast();
928 u4 attribute_length = cfs->get_u4_fast();
929 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
930 cp->tag_at(attribute_name_index).is_utf8(),
931 "Invalid field attribute index %u in class file %s",
932 attribute_name_index,
933 CHECK);
934 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
935 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
936 // ignore if non-static
937 if (constantvalue_index != 0) {
938 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
939 }
940 check_property(
941 attribute_length == 2,
942 "Invalid ConstantValue field attribute length %u in class file %s",
943 attribute_length, CHECK);
944 constantvalue_index = cfs->get_u2(CHECK);
945 if (_need_verify) {
946 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
947 }
948 } else if (attribute_name == vmSymbols::tag_synthetic()) {
949 if (attribute_length != 0) {
950 classfile_parse_error(
951 "Invalid Synthetic field attribute length %u in class file %s",
952 attribute_length, CHECK);
953 }
954 is_synthetic = true;
955 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
956 if (attribute_length != 0) {
957 classfile_parse_error(
958 "Invalid Deprecated field attribute length %u in class file %s",
959 attribute_length, CHECK);
960 }
961 } else if (_major_version >= JAVA_1_5_VERSION) {
962 if (attribute_name == vmSymbols::tag_signature()) {
963 if (attribute_length != 2) {
964 classfile_parse_error(
965 "Wrong size %u for field's Signature attribute in class file %s",
966 attribute_length, CHECK);
967 }
968 generic_signature_index = cfs->get_u2(CHECK);
969 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
970 runtime_visible_annotations_length = attribute_length;
971 runtime_visible_annotations = cfs->get_u1_buffer();
972 assert(runtime_visible_annotations != NULL, "null visible annotations");
973 parse_annotations(loader_data,
974 runtime_visible_annotations,
975 runtime_visible_annotations_length,
976 cp,
977 parsed_annotations,
978 CHECK);
979 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
980 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
981 runtime_invisible_annotations_length = attribute_length;
982 runtime_invisible_annotations = cfs->get_u1_buffer();
983 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
984 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
985 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
986 runtime_visible_type_annotations_length = attribute_length;
987 runtime_visible_type_annotations = cfs->get_u1_buffer();
988 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
989 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
990 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
991 runtime_invisible_type_annotations_length = attribute_length;
992 runtime_invisible_type_annotations = cfs->get_u1_buffer();
993 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
994 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
995 } else {
996 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
997 }
998 } else {
999 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1000 }
1001 }
1003 *constantvalue_index_addr = constantvalue_index;
1004 *is_synthetic_addr = is_synthetic;
1005 *generic_signature_index_addr = generic_signature_index;
1006 *field_annotations = assemble_annotations(loader_data,
1007 runtime_visible_annotations,
1008 runtime_visible_annotations_length,
1009 runtime_invisible_annotations,
1010 runtime_invisible_annotations_length,
1011 CHECK);
1012 *field_type_annotations = assemble_annotations(loader_data,
1013 runtime_visible_type_annotations,
1014 runtime_visible_type_annotations_length,
1015 runtime_invisible_type_annotations,
1016 runtime_invisible_type_annotations_length,
1017 CHECK);
1018 return;
1019 }
1022 // Field allocation types. Used for computing field offsets.
1024 enum FieldAllocationType {
1025 STATIC_OOP, // Oops
1026 STATIC_BYTE, // Boolean, Byte, char
1027 STATIC_SHORT, // shorts
1028 STATIC_WORD, // ints
1029 STATIC_DOUBLE, // aligned long or double
1030 NONSTATIC_OOP,
1031 NONSTATIC_BYTE,
1032 NONSTATIC_SHORT,
1033 NONSTATIC_WORD,
1034 NONSTATIC_DOUBLE,
1035 MAX_FIELD_ALLOCATION_TYPE,
1036 BAD_ALLOCATION_TYPE = -1
1037 };
1039 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1040 BAD_ALLOCATION_TYPE, // 0
1041 BAD_ALLOCATION_TYPE, // 1
1042 BAD_ALLOCATION_TYPE, // 2
1043 BAD_ALLOCATION_TYPE, // 3
1044 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1045 NONSTATIC_SHORT, // T_CHAR = 5,
1046 NONSTATIC_WORD, // T_FLOAT = 6,
1047 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1048 NONSTATIC_BYTE, // T_BYTE = 8,
1049 NONSTATIC_SHORT, // T_SHORT = 9,
1050 NONSTATIC_WORD, // T_INT = 10,
1051 NONSTATIC_DOUBLE, // T_LONG = 11,
1052 NONSTATIC_OOP, // T_OBJECT = 12,
1053 NONSTATIC_OOP, // T_ARRAY = 13,
1054 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1055 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1056 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1057 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1058 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1059 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1060 BAD_ALLOCATION_TYPE, // 0
1061 BAD_ALLOCATION_TYPE, // 1
1062 BAD_ALLOCATION_TYPE, // 2
1063 BAD_ALLOCATION_TYPE, // 3
1064 STATIC_BYTE , // T_BOOLEAN = 4,
1065 STATIC_SHORT, // T_CHAR = 5,
1066 STATIC_WORD, // T_FLOAT = 6,
1067 STATIC_DOUBLE, // T_DOUBLE = 7,
1068 STATIC_BYTE, // T_BYTE = 8,
1069 STATIC_SHORT, // T_SHORT = 9,
1070 STATIC_WORD, // T_INT = 10,
1071 STATIC_DOUBLE, // T_LONG = 11,
1072 STATIC_OOP, // T_OBJECT = 12,
1073 STATIC_OOP, // T_ARRAY = 13,
1074 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1075 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1076 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1077 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1078 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1079 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1080 };
1082 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1083 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1084 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1085 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1086 return result;
1087 }
1089 class FieldAllocationCount: public ResourceObj {
1090 public:
1091 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1093 FieldAllocationCount() {
1094 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1095 count[i] = 0;
1096 }
1097 }
1099 FieldAllocationType update(bool is_static, BasicType type) {
1100 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1101 // Make sure there is no overflow with injected fields.
1102 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1103 count[atype]++;
1104 return atype;
1105 }
1106 };
1108 Array<u2>* ClassFileParser::parse_fields(ClassLoaderData* loader_data,
1109 Symbol* class_name,
1110 constantPoolHandle cp,
1111 bool is_interface,
1112 FieldAllocationCount *fac,
1113 Array<AnnotationArray*>** fields_annotations,
1114 Array<AnnotationArray*>** fields_type_annotations,
1115 u2* java_fields_count_ptr, TRAPS) {
1116 ClassFileStream* cfs = stream();
1117 cfs->guarantee_more(2, CHECK_NULL); // length
1118 u2 length = cfs->get_u2_fast();
1119 *java_fields_count_ptr = length;
1121 int num_injected = 0;
1122 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1123 int total_fields = length + num_injected;
1125 // The field array starts with tuples of shorts
1126 // [access, name index, sig index, initial value index, byte offset].
1127 // A generic signature slot only exists for field with generic
1128 // signature attribute. And the access flag is set with
1129 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1130 // signature slots are at the end of the field array and after all
1131 // other fields data.
1132 //
1133 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1134 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1135 // ...
1136 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1137 // [generic signature index]
1138 // [generic signature index]
1139 // ...
1140 //
1141 // Allocate a temporary resource array for field data. For each field,
1142 // a slot is reserved in the temporary array for the generic signature
1143 // index. After parsing all fields, the data are copied to a permanent
1144 // array and any unused slots will be discarded.
1145 ResourceMark rm(THREAD);
1146 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1147 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1149 AnnotationArray* field_annotations = NULL;
1150 AnnotationArray* field_type_annotations = NULL;
1151 // The generic signature slots start after all other fields' data.
1152 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1153 int num_generic_signature = 0;
1154 for (int n = 0; n < length; n++) {
1155 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1157 AccessFlags access_flags;
1158 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1159 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1160 access_flags.set_flags(flags);
1162 u2 name_index = cfs->get_u2_fast();
1163 int cp_size = cp->length();
1164 check_property(
1165 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1166 "Invalid constant pool index %u for field name in class file %s",
1167 name_index, CHECK_NULL);
1168 Symbol* name = cp->symbol_at(name_index);
1169 verify_legal_field_name(name, CHECK_NULL);
1171 u2 signature_index = cfs->get_u2_fast();
1172 check_property(
1173 valid_cp_range(signature_index, cp_size) &&
1174 cp->tag_at(signature_index).is_utf8(),
1175 "Invalid constant pool index %u for field signature in class file %s",
1176 signature_index, CHECK_NULL);
1177 Symbol* sig = cp->symbol_at(signature_index);
1178 verify_legal_field_signature(name, sig, CHECK_NULL);
1180 u2 constantvalue_index = 0;
1181 bool is_synthetic = false;
1182 u2 generic_signature_index = 0;
1183 bool is_static = access_flags.is_static();
1184 FieldAnnotationCollector parsed_annotations;
1186 u2 attributes_count = cfs->get_u2_fast();
1187 if (attributes_count > 0) {
1188 parse_field_attributes(loader_data,
1189 cp, attributes_count, is_static, signature_index,
1190 &constantvalue_index, &is_synthetic,
1191 &generic_signature_index, &field_annotations,
1192 &field_type_annotations, &parsed_annotations,
1193 CHECK_NULL);
1194 if (field_annotations != NULL) {
1195 if (*fields_annotations == NULL) {
1196 *fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1197 loader_data, length, NULL,
1198 CHECK_NULL);
1199 }
1200 (*fields_annotations)->at_put(n, field_annotations);
1201 }
1202 if (field_type_annotations != NULL) {
1203 if (*fields_type_annotations == NULL) {
1204 *fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1205 loader_data, length, NULL,
1206 CHECK_NULL);
1207 }
1208 (*fields_type_annotations)->at_put(n, field_type_annotations);
1209 }
1210 if (is_synthetic) {
1211 access_flags.set_is_synthetic();
1212 }
1213 if (generic_signature_index != 0) {
1214 access_flags.set_field_has_generic_signature();
1215 fa[generic_signature_slot] = generic_signature_index;
1216 generic_signature_slot ++;
1217 num_generic_signature ++;
1218 }
1219 }
1221 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1222 field->initialize(access_flags.as_short(),
1223 name_index,
1224 signature_index,
1225 constantvalue_index);
1226 BasicType type = cp->basic_type_for_signature_at(signature_index);
1228 // Remember how many oops we encountered and compute allocation type
1229 FieldAllocationType atype = fac->update(is_static, type);
1230 field->set_allocation_type(atype);
1232 // After field is initialized with type, we can augment it with aux info
1233 if (parsed_annotations.has_any_annotations())
1234 parsed_annotations.apply_to(field);
1235 }
1237 int index = length;
1238 if (num_injected != 0) {
1239 for (int n = 0; n < num_injected; n++) {
1240 // Check for duplicates
1241 if (injected[n].may_be_java) {
1242 Symbol* name = injected[n].name();
1243 Symbol* signature = injected[n].signature();
1244 bool duplicate = false;
1245 for (int i = 0; i < length; i++) {
1246 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1247 if (name == cp->symbol_at(f->name_index()) &&
1248 signature == cp->symbol_at(f->signature_index())) {
1249 // Symbol is desclared in Java so skip this one
1250 duplicate = true;
1251 break;
1252 }
1253 }
1254 if (duplicate) {
1255 // These will be removed from the field array at the end
1256 continue;
1257 }
1258 }
1260 // Injected field
1261 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1262 field->initialize(JVM_ACC_FIELD_INTERNAL,
1263 injected[n].name_index,
1264 injected[n].signature_index,
1265 0);
1267 BasicType type = FieldType::basic_type(injected[n].signature());
1269 // Remember how many oops we encountered and compute allocation type
1270 FieldAllocationType atype = fac->update(false, type);
1271 field->set_allocation_type(atype);
1272 index++;
1273 }
1274 }
1276 // Now copy the fields' data from the temporary resource array.
1277 // Sometimes injected fields already exist in the Java source so
1278 // the fields array could be too long. In that case the
1279 // fields array is trimed. Also unused slots that were reserved
1280 // for generic signature indexes are discarded.
1281 Array<u2>* fields = MetadataFactory::new_array<u2>(
1282 loader_data, index * FieldInfo::field_slots + num_generic_signature,
1283 CHECK_NULL);
1284 {
1285 int i = 0;
1286 for (; i < index * FieldInfo::field_slots; i++) {
1287 fields->at_put(i, fa[i]);
1288 }
1289 for (int j = total_fields * FieldInfo::field_slots;
1290 j < generic_signature_slot; j++) {
1291 fields->at_put(i++, fa[j]);
1292 }
1293 assert(i == fields->length(), "");
1294 }
1296 if (_need_verify && length > 1) {
1297 // Check duplicated fields
1298 ResourceMark rm(THREAD);
1299 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1300 THREAD, NameSigHash*, HASH_ROW_SIZE);
1301 initialize_hashtable(names_and_sigs);
1302 bool dup = false;
1303 {
1304 debug_only(No_Safepoint_Verifier nsv;)
1305 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1306 Symbol* name = fs.name();
1307 Symbol* sig = fs.signature();
1308 // If no duplicates, add name/signature in hashtable names_and_sigs.
1309 if (!put_after_lookup(name, sig, names_and_sigs)) {
1310 dup = true;
1311 break;
1312 }
1313 }
1314 }
1315 if (dup) {
1316 classfile_parse_error("Duplicate field name&signature in class file %s",
1317 CHECK_NULL);
1318 }
1319 }
1321 return fields;
1322 }
1325 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1326 while (length-- > 0) {
1327 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1328 }
1329 }
1332 u2* ClassFileParser::parse_exception_table(ClassLoaderData* loader_data,
1333 u4 code_length,
1334 u4 exception_table_length,
1335 constantPoolHandle cp,
1336 TRAPS) {
1337 ClassFileStream* cfs = stream();
1339 u2* exception_table_start = cfs->get_u2_buffer();
1340 assert(exception_table_start != NULL, "null exception table");
1341 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1342 // Will check legal target after parsing code array in verifier.
1343 if (_need_verify) {
1344 for (unsigned int i = 0; i < exception_table_length; i++) {
1345 u2 start_pc = cfs->get_u2_fast();
1346 u2 end_pc = cfs->get_u2_fast();
1347 u2 handler_pc = cfs->get_u2_fast();
1348 u2 catch_type_index = cfs->get_u2_fast();
1349 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1350 "Illegal exception table range in class file %s",
1351 CHECK_NULL);
1352 guarantee_property(handler_pc < code_length,
1353 "Illegal exception table handler in class file %s",
1354 CHECK_NULL);
1355 if (catch_type_index != 0) {
1356 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1357 is_klass_reference(cp, catch_type_index),
1358 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1359 }
1360 }
1361 } else {
1362 cfs->skip_u2_fast(exception_table_length * 4);
1363 }
1364 return exception_table_start;
1365 }
1367 void ClassFileParser::parse_linenumber_table(
1368 u4 code_attribute_length, u4 code_length,
1369 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1370 ClassFileStream* cfs = stream();
1371 unsigned int num_entries = cfs->get_u2(CHECK);
1373 // Each entry is a u2 start_pc, and a u2 line_number
1374 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1376 // Verify line number attribute and table length
1377 check_property(
1378 code_attribute_length == sizeof(u2) + length_in_bytes,
1379 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1381 cfs->guarantee_more(length_in_bytes, CHECK);
1383 if ((*write_stream) == NULL) {
1384 if (length_in_bytes > fixed_buffer_size) {
1385 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1386 } else {
1387 (*write_stream) = new CompressedLineNumberWriteStream(
1388 linenumbertable_buffer, fixed_buffer_size);
1389 }
1390 }
1392 while (num_entries-- > 0) {
1393 u2 bci = cfs->get_u2_fast(); // start_pc
1394 u2 line = cfs->get_u2_fast(); // line_number
1395 guarantee_property(bci < code_length,
1396 "Invalid pc in LineNumberTable in class file %s", CHECK);
1397 (*write_stream)->write_pair(bci, line);
1398 }
1399 }
1402 // Class file LocalVariableTable elements.
1403 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1404 public:
1405 u2 start_bci;
1406 u2 length;
1407 u2 name_cp_index;
1408 u2 descriptor_cp_index;
1409 u2 slot;
1410 };
1413 class LVT_Hash: public CHeapObj<mtClass> {
1414 public:
1415 LocalVariableTableElement *_elem; // element
1416 LVT_Hash* _next; // Next entry in hash table
1417 };
1419 unsigned int hash(LocalVariableTableElement *elem) {
1420 unsigned int raw_hash = elem->start_bci;
1422 raw_hash = elem->length + raw_hash * 37;
1423 raw_hash = elem->name_cp_index + raw_hash * 37;
1424 raw_hash = elem->slot + raw_hash * 37;
1426 return raw_hash % HASH_ROW_SIZE;
1427 }
1429 void initialize_hashtable(LVT_Hash** table) {
1430 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1431 table[i] = NULL;
1432 }
1433 }
1435 void clear_hashtable(LVT_Hash** table) {
1436 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1437 LVT_Hash* current = table[i];
1438 LVT_Hash* next;
1439 while (current != NULL) {
1440 next = current->_next;
1441 current->_next = NULL;
1442 delete(current);
1443 current = next;
1444 }
1445 table[i] = NULL;
1446 }
1447 }
1449 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1450 LVT_Hash* entry = table[index];
1452 /*
1453 * 3-tuple start_bci/length/slot has to be unique key,
1454 * so the following comparison seems to be redundant:
1455 * && elem->name_cp_index == entry->_elem->name_cp_index
1456 */
1457 while (entry != NULL) {
1458 if (elem->start_bci == entry->_elem->start_bci
1459 && elem->length == entry->_elem->length
1460 && elem->name_cp_index == entry->_elem->name_cp_index
1461 && elem->slot == entry->_elem->slot
1462 ) {
1463 return entry;
1464 }
1465 entry = entry->_next;
1466 }
1467 return NULL;
1468 }
1470 // Return false if the local variable is found in table.
1471 // Return true if no duplicate is found.
1472 // And local variable is added as a new entry in table.
1473 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1474 // First lookup for duplicates
1475 int index = hash(elem);
1476 LVT_Hash* entry = LVT_lookup(elem, index, table);
1478 if (entry != NULL) {
1479 return false;
1480 }
1481 // No duplicate is found, allocate a new entry and fill it.
1482 if ((entry = new LVT_Hash()) == NULL) {
1483 return false;
1484 }
1485 entry->_elem = elem;
1487 // Insert into hash table
1488 entry->_next = table[index];
1489 table[index] = entry;
1491 return true;
1492 }
1494 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1495 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1496 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1497 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1498 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1499 lvt->signature_cp_index = 0;
1500 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1501 }
1503 // Function is used to parse both attributes:
1504 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1505 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1506 u2 max_locals,
1507 u4 code_attribute_length,
1508 constantPoolHandle cp,
1509 u2* localvariable_table_length,
1510 bool isLVTT,
1511 TRAPS) {
1512 ClassFileStream* cfs = stream();
1513 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1514 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1515 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1516 // Verify local variable table attribute has right length
1517 if (_need_verify) {
1518 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1519 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1520 }
1521 u2* localvariable_table_start = cfs->get_u2_buffer();
1522 assert(localvariable_table_start != NULL, "null local variable table");
1523 if (!_need_verify) {
1524 cfs->skip_u2_fast(size);
1525 } else {
1526 cfs->guarantee_more(size * 2, CHECK_NULL);
1527 for(int i = 0; i < (*localvariable_table_length); i++) {
1528 u2 start_pc = cfs->get_u2_fast();
1529 u2 length = cfs->get_u2_fast();
1530 u2 name_index = cfs->get_u2_fast();
1531 u2 descriptor_index = cfs->get_u2_fast();
1532 u2 index = cfs->get_u2_fast();
1533 // Assign to a u4 to avoid overflow
1534 u4 end_pc = (u4)start_pc + (u4)length;
1536 if (start_pc >= code_length) {
1537 classfile_parse_error(
1538 "Invalid start_pc %u in %s in class file %s",
1539 start_pc, tbl_name, CHECK_NULL);
1540 }
1541 if (end_pc > code_length) {
1542 classfile_parse_error(
1543 "Invalid length %u in %s in class file %s",
1544 length, tbl_name, CHECK_NULL);
1545 }
1546 int cp_size = cp->length();
1547 guarantee_property(
1548 valid_cp_range(name_index, cp_size) &&
1549 cp->tag_at(name_index).is_utf8(),
1550 "Name index %u in %s has bad constant type in class file %s",
1551 name_index, tbl_name, CHECK_NULL);
1552 guarantee_property(
1553 valid_cp_range(descriptor_index, cp_size) &&
1554 cp->tag_at(descriptor_index).is_utf8(),
1555 "Signature index %u in %s has bad constant type in class file %s",
1556 descriptor_index, tbl_name, CHECK_NULL);
1558 Symbol* name = cp->symbol_at(name_index);
1559 Symbol* sig = cp->symbol_at(descriptor_index);
1560 verify_legal_field_name(name, CHECK_NULL);
1561 u2 extra_slot = 0;
1562 if (!isLVTT) {
1563 verify_legal_field_signature(name, sig, CHECK_NULL);
1565 // 4894874: check special cases for double and long local variables
1566 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1567 sig == vmSymbols::type_signature(T_LONG)) {
1568 extra_slot = 1;
1569 }
1570 }
1571 guarantee_property((index + extra_slot) < max_locals,
1572 "Invalid index %u in %s in class file %s",
1573 index, tbl_name, CHECK_NULL);
1574 }
1575 }
1576 return localvariable_table_start;
1577 }
1580 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1581 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1582 ClassFileStream* cfs = stream();
1583 u2 index = 0; // index in the array with long/double occupying two slots
1584 u4 i1 = *u1_index;
1585 u4 i2 = *u2_index + 1;
1586 for(int i = 0; i < array_length; i++) {
1587 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1588 index++;
1589 if (tag == ITEM_Long || tag == ITEM_Double) {
1590 index++;
1591 } else if (tag == ITEM_Object) {
1592 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1593 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1594 is_klass_reference(cp, class_index),
1595 "Bad class index %u in StackMap in class file %s",
1596 class_index, CHECK);
1597 } else if (tag == ITEM_Uninitialized) {
1598 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1599 guarantee_property(
1600 offset < code_length,
1601 "Bad uninitialized type offset %u in StackMap in class file %s",
1602 offset, CHECK);
1603 } else {
1604 guarantee_property(
1605 tag <= (u1)ITEM_Uninitialized,
1606 "Unknown variable type %u in StackMap in class file %s",
1607 tag, CHECK);
1608 }
1609 }
1610 u2_array[*u2_index] = index;
1611 *u1_index = i1;
1612 *u2_index = i2;
1613 }
1615 Array<u1>* ClassFileParser::parse_stackmap_table(
1616 ClassLoaderData* loader_data,
1617 u4 code_attribute_length, TRAPS) {
1618 if (code_attribute_length == 0)
1619 return NULL;
1621 ClassFileStream* cfs = stream();
1622 u1* stackmap_table_start = cfs->get_u1_buffer();
1623 assert(stackmap_table_start != NULL, "null stackmap table");
1625 // check code_attribute_length first
1626 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1628 if (!_need_verify && !DumpSharedSpaces) {
1629 return NULL;
1630 }
1632 Array<u1>* stackmap_data =
1633 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1635 memcpy((void*)stackmap_data->adr_at(0),
1636 (void*)stackmap_table_start, code_attribute_length);
1637 return stackmap_data;
1638 }
1640 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1641 u4 method_attribute_length,
1642 constantPoolHandle cp, TRAPS) {
1643 ClassFileStream* cfs = stream();
1644 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1645 *checked_exceptions_length = cfs->get_u2_fast();
1646 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1647 u2* checked_exceptions_start = cfs->get_u2_buffer();
1648 assert(checked_exceptions_start != NULL, "null checked exceptions");
1649 if (!_need_verify) {
1650 cfs->skip_u2_fast(size);
1651 } else {
1652 // Verify each value in the checked exception table
1653 u2 checked_exception;
1654 u2 len = *checked_exceptions_length;
1655 cfs->guarantee_more(2 * len, CHECK_NULL);
1656 for (int i = 0; i < len; i++) {
1657 checked_exception = cfs->get_u2_fast();
1658 check_property(
1659 valid_cp_range(checked_exception, cp->length()) &&
1660 is_klass_reference(cp, checked_exception),
1661 "Exception name has bad type at constant pool %u in class file %s",
1662 checked_exception, CHECK_NULL);
1663 }
1664 }
1665 // check exceptions attribute length
1666 if (_need_verify) {
1667 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1668 sizeof(u2) * size),
1669 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1670 }
1671 return checked_exceptions_start;
1672 }
1674 void ClassFileParser::throwIllegalSignature(
1675 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1676 ResourceMark rm(THREAD);
1677 Exceptions::fthrow(THREAD_AND_LOCATION,
1678 vmSymbols::java_lang_ClassFormatError(),
1679 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1680 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1681 }
1683 // Skip an annotation. Return >=limit if there is any problem.
1684 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1685 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1686 // value := switch (tag:u1) { ... }
1687 index += 2; // skip atype
1688 if ((index += 2) >= limit) return limit; // read nmem
1689 int nmem = Bytes::get_Java_u2(buffer+index-2);
1690 while (--nmem >= 0 && index < limit) {
1691 index += 2; // skip member
1692 index = skip_annotation_value(buffer, limit, index);
1693 }
1694 return index;
1695 }
1697 // Skip an annotation value. Return >=limit if there is any problem.
1698 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1699 // value := switch (tag:u1) {
1700 // case B, C, I, S, Z, D, F, J, c: con:u2;
1701 // case e: e_class:u2 e_name:u2;
1702 // case s: s_con:u2;
1703 // case [: do(nval:u2) {value};
1704 // case @: annotation;
1705 // case s: s_con:u2;
1706 // }
1707 if ((index += 1) >= limit) return limit; // read tag
1708 u1 tag = buffer[index-1];
1709 switch (tag) {
1710 case 'B': case 'C': case 'I': case 'S': case 'Z':
1711 case 'D': case 'F': case 'J': case 'c': case 's':
1712 index += 2; // skip con or s_con
1713 break;
1714 case 'e':
1715 index += 4; // skip e_class, e_name
1716 break;
1717 case '[':
1718 {
1719 if ((index += 2) >= limit) return limit; // read nval
1720 int nval = Bytes::get_Java_u2(buffer+index-2);
1721 while (--nval >= 0 && index < limit) {
1722 index = skip_annotation_value(buffer, limit, index);
1723 }
1724 }
1725 break;
1726 case '@':
1727 index = skip_annotation(buffer, limit, index);
1728 break;
1729 default:
1730 assert(false, "annotation tag");
1731 return limit; // bad tag byte
1732 }
1733 return index;
1734 }
1736 // Sift through annotations, looking for those significant to the VM:
1737 void ClassFileParser::parse_annotations(ClassLoaderData* loader_data,
1738 u1* buffer, int limit,
1739 constantPoolHandle cp,
1740 ClassFileParser::AnnotationCollector* coll,
1741 TRAPS) {
1742 // annotations := do(nann:u2) {annotation}
1743 int index = 0;
1744 if ((index += 2) >= limit) return; // read nann
1745 int nann = Bytes::get_Java_u2(buffer+index-2);
1746 enum { // initial annotation layout
1747 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1748 count_off = 2, // u2 such as 1 (one value)
1749 member_off = 4, // utf8 such as 'value'
1750 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1751 e_tag_val = 'e',
1752 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1753 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1754 e_size = 11, // end of 'e' annotation
1755 c_tag_val = 'c', // payload is type
1756 c_con_off = 7, // utf8 payload, such as 'I'
1757 c_size = 9, // end of 'c' annotation
1758 s_tag_val = 's', // payload is String
1759 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1760 s_size = 9,
1761 min_size = 6 // smallest possible size (zero members)
1762 };
1763 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1764 int index0 = index;
1765 index = skip_annotation(buffer, limit, index);
1766 u1* abase = buffer + index0;
1767 int atype = Bytes::get_Java_u2(abase + atype_off);
1768 int count = Bytes::get_Java_u2(abase + count_off);
1769 Symbol* aname = check_symbol_at(cp, atype);
1770 if (aname == NULL) break; // invalid annotation name
1771 Symbol* member = NULL;
1772 if (count >= 1) {
1773 int member_index = Bytes::get_Java_u2(abase + member_off);
1774 member = check_symbol_at(cp, member_index);
1775 if (member == NULL) break; // invalid member name
1776 }
1778 // Here is where parsing particular annotations will take place.
1779 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1780 if (id == AnnotationCollector::_unknown) continue;
1781 coll->set_annotation(id);
1783 if (id == AnnotationCollector::_sun_misc_Contended) {
1784 if (count == 1
1785 && s_size == (index - index0) // match size
1786 && s_tag_val == *(abase + tag_off)
1787 && member == vmSymbols::value_name()) {
1788 u2 group_index = Bytes::get_Java_u2(abase + s_con_off);
1789 coll->set_contended_group(group_index);
1790 } else {
1791 coll->set_contended_group(0); // default contended group
1792 }
1793 coll->set_contended(true);
1794 } else {
1795 coll->set_contended(false);
1796 }
1797 }
1798 }
1800 ClassFileParser::AnnotationCollector::ID
1801 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1802 Symbol* name) {
1803 vmSymbols::SID sid = vmSymbols::find_sid(name);
1804 bool privileged = false;
1805 if (loader_data->is_the_null_class_loader_data()) {
1806 // Privileged code can use all annotations. Other code silently drops some.
1807 privileged = true;
1808 }
1809 switch (sid) {
1810 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1811 if (_location != _in_method) break; // only allow for methods
1812 if (!privileged) break; // only allow in privileged code
1813 return _method_ForceInline;
1814 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1815 if (_location != _in_method) break; // only allow for methods
1816 if (!privileged) break; // only allow in privileged code
1817 return _method_DontInline;
1818 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1819 if (_location != _in_method) break; // only allow for methods
1820 if (!privileged) break; // only allow in privileged code
1821 return _method_LambdaForm_Compiled;
1822 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1823 if (_location != _in_method) break; // only allow for methods
1824 if (!privileged) break; // only allow in privileged code
1825 return _method_LambdaForm_Hidden;
1826 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1827 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1828 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1829 return _sun_misc_Contended;
1830 default: break;
1831 }
1832 return AnnotationCollector::_unknown;
1833 }
1835 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1836 if (is_contended())
1837 f->set_contended_group(contended_group());
1838 }
1840 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1841 if (has_annotation(_method_ForceInline))
1842 m->set_force_inline(true);
1843 if (has_annotation(_method_DontInline))
1844 m->set_dont_inline(true);
1845 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1846 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1847 if (has_annotation(_method_LambdaForm_Hidden))
1848 m->set_hidden(true);
1849 }
1851 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1852 k->set_is_contended(is_contended());
1853 }
1856 #define MAX_ARGS_SIZE 255
1857 #define MAX_CODE_SIZE 65535
1858 #define INITIAL_MAX_LVT_NUMBER 256
1860 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1861 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1862 // Method* to save footprint, so we only know the size of the resulting Method* when the
1863 // entire method attribute is parsed.
1864 //
1865 // The promoted_flags parameter is used to pass relevant access_flags
1866 // from the method back up to the containing klass. These flag values
1867 // are added to klass's access_flags.
1869 methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
1870 constantPoolHandle cp,
1871 bool is_interface,
1872 AccessFlags *promoted_flags,
1873 AnnotationArray** method_annotations,
1874 AnnotationArray** method_parameter_annotations,
1875 AnnotationArray** method_default_annotations,
1876 AnnotationArray** method_type_annotations,
1877 TRAPS) {
1878 ClassFileStream* cfs = stream();
1879 methodHandle nullHandle;
1880 ResourceMark rm(THREAD);
1881 // Parse fixed parts
1882 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1884 int flags = cfs->get_u2_fast();
1885 u2 name_index = cfs->get_u2_fast();
1886 int cp_size = cp->length();
1887 check_property(
1888 valid_cp_range(name_index, cp_size) &&
1889 cp->tag_at(name_index).is_utf8(),
1890 "Illegal constant pool index %u for method name in class file %s",
1891 name_index, CHECK_(nullHandle));
1892 Symbol* name = cp->symbol_at(name_index);
1893 verify_legal_method_name(name, CHECK_(nullHandle));
1895 u2 signature_index = cfs->get_u2_fast();
1896 guarantee_property(
1897 valid_cp_range(signature_index, cp_size) &&
1898 cp->tag_at(signature_index).is_utf8(),
1899 "Illegal constant pool index %u for method signature in class file %s",
1900 signature_index, CHECK_(nullHandle));
1901 Symbol* signature = cp->symbol_at(signature_index);
1903 AccessFlags access_flags;
1904 if (name == vmSymbols::class_initializer_name()) {
1905 // We ignore the other access flags for a valid class initializer.
1906 // (JVM Spec 2nd ed., chapter 4.6)
1907 if (_major_version < 51) { // backward compatibility
1908 flags = JVM_ACC_STATIC;
1909 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1910 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1911 }
1912 } else {
1913 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1914 }
1916 int args_size = -1; // only used when _need_verify is true
1917 if (_need_verify) {
1918 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1919 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1920 if (args_size > MAX_ARGS_SIZE) {
1921 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1922 }
1923 }
1925 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1927 // Default values for code and exceptions attribute elements
1928 u2 max_stack = 0;
1929 u2 max_locals = 0;
1930 u4 code_length = 0;
1931 u1* code_start = 0;
1932 u2 exception_table_length = 0;
1933 u2* exception_table_start = NULL;
1934 Array<int>* exception_handlers = Universe::the_empty_int_array();
1935 u2 checked_exceptions_length = 0;
1936 u2* checked_exceptions_start = NULL;
1937 CompressedLineNumberWriteStream* linenumber_table = NULL;
1938 int linenumber_table_length = 0;
1939 int total_lvt_length = 0;
1940 u2 lvt_cnt = 0;
1941 u2 lvtt_cnt = 0;
1942 bool lvt_allocated = false;
1943 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1944 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1945 u2* localvariable_table_length;
1946 u2** localvariable_table_start;
1947 u2* localvariable_type_table_length;
1948 u2** localvariable_type_table_start;
1949 u2 method_parameters_length = 0;
1950 u1* method_parameters_data = NULL;
1951 bool parsed_code_attribute = false;
1952 bool parsed_checked_exceptions_attribute = false;
1953 bool parsed_stackmap_attribute = false;
1954 // stackmap attribute - JDK1.5
1955 Array<u1>* stackmap_data = NULL;
1956 u2 generic_signature_index = 0;
1957 MethodAnnotationCollector parsed_annotations;
1958 u1* runtime_visible_annotations = NULL;
1959 int runtime_visible_annotations_length = 0;
1960 u1* runtime_invisible_annotations = NULL;
1961 int runtime_invisible_annotations_length = 0;
1962 u1* runtime_visible_parameter_annotations = NULL;
1963 int runtime_visible_parameter_annotations_length = 0;
1964 u1* runtime_invisible_parameter_annotations = NULL;
1965 int runtime_invisible_parameter_annotations_length = 0;
1966 u1* runtime_visible_type_annotations = NULL;
1967 int runtime_visible_type_annotations_length = 0;
1968 u1* runtime_invisible_type_annotations = NULL;
1969 int runtime_invisible_type_annotations_length = 0;
1970 u1* annotation_default = NULL;
1971 int annotation_default_length = 0;
1973 // Parse code and exceptions attribute
1974 u2 method_attributes_count = cfs->get_u2_fast();
1975 while (method_attributes_count--) {
1976 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1977 u2 method_attribute_name_index = cfs->get_u2_fast();
1978 u4 method_attribute_length = cfs->get_u4_fast();
1979 check_property(
1980 valid_cp_range(method_attribute_name_index, cp_size) &&
1981 cp->tag_at(method_attribute_name_index).is_utf8(),
1982 "Invalid method attribute name index %u in class file %s",
1983 method_attribute_name_index, CHECK_(nullHandle));
1985 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1986 if (method_attribute_name == vmSymbols::tag_code()) {
1987 // Parse Code attribute
1988 if (_need_verify) {
1989 guarantee_property(
1990 !access_flags.is_native() && !access_flags.is_abstract(),
1991 "Code attribute in native or abstract methods in class file %s",
1992 CHECK_(nullHandle));
1993 }
1994 if (parsed_code_attribute) {
1995 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1996 }
1997 parsed_code_attribute = true;
1999 // Stack size, locals size, and code size
2000 if (_major_version == 45 && _minor_version <= 2) {
2001 cfs->guarantee_more(4, CHECK_(nullHandle));
2002 max_stack = cfs->get_u1_fast();
2003 max_locals = cfs->get_u1_fast();
2004 code_length = cfs->get_u2_fast();
2005 } else {
2006 cfs->guarantee_more(8, CHECK_(nullHandle));
2007 max_stack = cfs->get_u2_fast();
2008 max_locals = cfs->get_u2_fast();
2009 code_length = cfs->get_u4_fast();
2010 }
2011 if (_need_verify) {
2012 guarantee_property(args_size <= max_locals,
2013 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2014 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2015 "Invalid method Code length %u in class file %s",
2016 code_length, CHECK_(nullHandle));
2017 }
2018 // Code pointer
2019 code_start = cfs->get_u1_buffer();
2020 assert(code_start != NULL, "null code start");
2021 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2022 cfs->skip_u1_fast(code_length);
2024 // Exception handler table
2025 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2026 exception_table_length = cfs->get_u2_fast();
2027 if (exception_table_length > 0) {
2028 exception_table_start =
2029 parse_exception_table(loader_data, code_length, exception_table_length, cp, CHECK_(nullHandle));
2030 }
2032 // Parse additional attributes in code attribute
2033 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2034 u2 code_attributes_count = cfs->get_u2_fast();
2036 unsigned int calculated_attribute_length = 0;
2038 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2039 calculated_attribute_length =
2040 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2041 } else {
2042 // max_stack, locals and length are smaller in pre-version 45.2 classes
2043 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2044 }
2045 calculated_attribute_length +=
2046 code_length +
2047 sizeof(exception_table_length) +
2048 sizeof(code_attributes_count) +
2049 exception_table_length *
2050 ( sizeof(u2) + // start_pc
2051 sizeof(u2) + // end_pc
2052 sizeof(u2) + // handler_pc
2053 sizeof(u2) ); // catch_type_index
2055 while (code_attributes_count--) {
2056 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2057 u2 code_attribute_name_index = cfs->get_u2_fast();
2058 u4 code_attribute_length = cfs->get_u4_fast();
2059 calculated_attribute_length += code_attribute_length +
2060 sizeof(code_attribute_name_index) +
2061 sizeof(code_attribute_length);
2062 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
2063 cp->tag_at(code_attribute_name_index).is_utf8(),
2064 "Invalid code attribute name index %u in class file %s",
2065 code_attribute_name_index,
2066 CHECK_(nullHandle));
2067 if (LoadLineNumberTables &&
2068 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2069 // Parse and compress line number table
2070 parse_linenumber_table(code_attribute_length, code_length,
2071 &linenumber_table, CHECK_(nullHandle));
2073 } else if (LoadLocalVariableTables &&
2074 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2075 // Parse local variable table
2076 if (!lvt_allocated) {
2077 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2078 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2079 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2080 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2081 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2082 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2083 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2084 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2085 lvt_allocated = true;
2086 }
2087 if (lvt_cnt == max_lvt_cnt) {
2088 max_lvt_cnt <<= 1;
2089 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2090 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2091 }
2092 localvariable_table_start[lvt_cnt] =
2093 parse_localvariable_table(code_length,
2094 max_locals,
2095 code_attribute_length,
2096 cp,
2097 &localvariable_table_length[lvt_cnt],
2098 false, // is not LVTT
2099 CHECK_(nullHandle));
2100 total_lvt_length += localvariable_table_length[lvt_cnt];
2101 lvt_cnt++;
2102 } else if (LoadLocalVariableTypeTables &&
2103 _major_version >= JAVA_1_5_VERSION &&
2104 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2105 if (!lvt_allocated) {
2106 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2107 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2108 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2109 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2110 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2111 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2112 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2113 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2114 lvt_allocated = true;
2115 }
2116 // Parse local variable type table
2117 if (lvtt_cnt == max_lvtt_cnt) {
2118 max_lvtt_cnt <<= 1;
2119 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2120 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2121 }
2122 localvariable_type_table_start[lvtt_cnt] =
2123 parse_localvariable_table(code_length,
2124 max_locals,
2125 code_attribute_length,
2126 cp,
2127 &localvariable_type_table_length[lvtt_cnt],
2128 true, // is LVTT
2129 CHECK_(nullHandle));
2130 lvtt_cnt++;
2131 } else if (UseSplitVerifier &&
2132 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2133 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2134 // Stack map is only needed by the new verifier in JDK1.5.
2135 if (parsed_stackmap_attribute) {
2136 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2137 }
2138 stackmap_data = parse_stackmap_table(loader_data, code_attribute_length, CHECK_(nullHandle));
2139 parsed_stackmap_attribute = true;
2140 } else {
2141 // Skip unknown attributes
2142 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2143 }
2144 }
2145 // check method attribute length
2146 if (_need_verify) {
2147 guarantee_property(method_attribute_length == calculated_attribute_length,
2148 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2149 }
2150 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2151 // Parse Exceptions attribute
2152 if (parsed_checked_exceptions_attribute) {
2153 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2154 }
2155 parsed_checked_exceptions_attribute = true;
2156 checked_exceptions_start =
2157 parse_checked_exceptions(&checked_exceptions_length,
2158 method_attribute_length,
2159 cp, CHECK_(nullHandle));
2160 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2161 method_parameters_length = cfs->get_u1_fast();
2162 method_parameters_data = cfs->get_u1_buffer();
2163 cfs->skip_u2_fast(method_parameters_length);
2164 cfs->skip_u4_fast(method_parameters_length);
2165 // ignore this attribute if it cannot be reflected
2166 if (!SystemDictionary::Parameter_klass_loaded())
2167 method_parameters_length = 0;
2168 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2169 if (method_attribute_length != 0) {
2170 classfile_parse_error(
2171 "Invalid Synthetic method attribute length %u in class file %s",
2172 method_attribute_length, CHECK_(nullHandle));
2173 }
2174 // Should we check that there hasn't already been a synthetic attribute?
2175 access_flags.set_is_synthetic();
2176 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2177 if (method_attribute_length != 0) {
2178 classfile_parse_error(
2179 "Invalid Deprecated method attribute length %u in class file %s",
2180 method_attribute_length, CHECK_(nullHandle));
2181 }
2182 } else if (_major_version >= JAVA_1_5_VERSION) {
2183 if (method_attribute_name == vmSymbols::tag_signature()) {
2184 if (method_attribute_length != 2) {
2185 classfile_parse_error(
2186 "Invalid Signature attribute length %u in class file %s",
2187 method_attribute_length, CHECK_(nullHandle));
2188 }
2189 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2190 generic_signature_index = cfs->get_u2_fast();
2191 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2192 runtime_visible_annotations_length = method_attribute_length;
2193 runtime_visible_annotations = cfs->get_u1_buffer();
2194 assert(runtime_visible_annotations != NULL, "null visible annotations");
2195 parse_annotations(loader_data,
2196 runtime_visible_annotations,
2197 runtime_visible_annotations_length, cp, &parsed_annotations,
2198 CHECK_(nullHandle));
2199 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2200 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2201 runtime_invisible_annotations_length = method_attribute_length;
2202 runtime_invisible_annotations = cfs->get_u1_buffer();
2203 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2204 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2205 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2206 runtime_visible_parameter_annotations_length = method_attribute_length;
2207 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2208 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2209 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2210 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2211 runtime_invisible_parameter_annotations_length = method_attribute_length;
2212 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2213 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2214 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2215 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2216 annotation_default_length = method_attribute_length;
2217 annotation_default = cfs->get_u1_buffer();
2218 assert(annotation_default != NULL, "null annotation default");
2219 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2220 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2221 runtime_visible_type_annotations_length = method_attribute_length;
2222 runtime_visible_type_annotations = cfs->get_u1_buffer();
2223 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2224 // No need for the VM to parse Type annotations
2225 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2226 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2227 runtime_invisible_type_annotations_length = method_attribute_length;
2228 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2229 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2230 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2231 } else {
2232 // Skip unknown attributes
2233 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2234 }
2235 } else {
2236 // Skip unknown attributes
2237 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2238 }
2239 }
2241 if (linenumber_table != NULL) {
2242 linenumber_table->write_terminator();
2243 linenumber_table_length = linenumber_table->position();
2244 }
2246 // Make sure there's at least one Code attribute in non-native/non-abstract method
2247 if (_need_verify) {
2248 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2249 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2250 }
2252 // All sizing information for a Method* is finally available, now create it
2253 Method* m = Method::allocate(
2254 loader_data, code_length, access_flags, linenumber_table_length,
2255 total_lvt_length, exception_table_length, checked_exceptions_length,
2256 method_parameters_length, generic_signature_index,
2257 ConstMethod::NORMAL, CHECK_(nullHandle));
2259 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2261 // Fill in information from fixed part (access_flags already set)
2262 m->set_constants(cp());
2263 m->set_name_index(name_index);
2264 m->set_signature_index(signature_index);
2265 #ifdef CC_INTERP
2266 // hmm is there a gc issue here??
2267 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2268 m->set_result_index(rtf.type());
2269 #endif
2271 if (args_size >= 0) {
2272 m->set_size_of_parameters(args_size);
2273 } else {
2274 m->compute_size_of_parameters(THREAD);
2275 }
2276 #ifdef ASSERT
2277 if (args_size >= 0) {
2278 m->compute_size_of_parameters(THREAD);
2279 assert(args_size == m->size_of_parameters(), "");
2280 }
2281 #endif
2283 // Fill in code attribute information
2284 m->set_max_stack(max_stack);
2285 m->set_max_locals(max_locals);
2286 m->constMethod()->set_stackmap_data(stackmap_data);
2288 // Copy byte codes
2289 m->set_code(code_start);
2291 // Copy line number table
2292 if (linenumber_table != NULL) {
2293 memcpy(m->compressed_linenumber_table(),
2294 linenumber_table->buffer(), linenumber_table_length);
2295 }
2297 // Copy exception table
2298 if (exception_table_length > 0) {
2299 int size =
2300 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2301 copy_u2_with_conversion((u2*) m->exception_table_start(),
2302 exception_table_start, size);
2303 }
2305 // Copy method parameters
2306 if (method_parameters_length > 0) {
2307 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2308 for(int i = 0; i < method_parameters_length; i++) {
2309 elem[i].name_cp_index =
2310 Bytes::get_Java_u2(method_parameters_data);
2311 method_parameters_data += 2;
2312 elem[i].flags = Bytes::get_Java_u4(method_parameters_data);
2313 method_parameters_data += 4;
2314 }
2315 }
2317 // Copy checked exceptions
2318 if (checked_exceptions_length > 0) {
2319 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2320 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2321 }
2323 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2324 *
2325 * Rules for LVT's and LVTT's are:
2326 * - There can be any number of LVT's and LVTT's.
2327 * - If there are n LVT's, it is the same as if there was just
2328 * one LVT containing all the entries from the n LVT's.
2329 * - There may be no more than one LVT entry per local variable.
2330 * Two LVT entries are 'equal' if these fields are the same:
2331 * start_pc, length, name, slot
2332 * - There may be no more than one LVTT entry per each LVT entry.
2333 * Each LVTT entry has to match some LVT entry.
2334 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2335 */
2336 if (total_lvt_length > 0) {
2337 int tbl_no, idx;
2339 promoted_flags->set_has_localvariable_table();
2341 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2342 initialize_hashtable(lvt_Hash);
2344 // To fill LocalVariableTable in
2345 Classfile_LVT_Element* cf_lvt;
2346 LocalVariableTableElement* lvt = m->localvariable_table_start();
2348 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2349 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2350 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2351 copy_lvt_element(&cf_lvt[idx], lvt);
2352 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2353 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2354 && _need_verify
2355 && _major_version >= JAVA_1_5_VERSION ) {
2356 clear_hashtable(lvt_Hash);
2357 classfile_parse_error("Duplicated LocalVariableTable attribute "
2358 "entry for '%s' in class file %s",
2359 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2360 CHECK_(nullHandle));
2361 }
2362 }
2363 }
2365 // To merge LocalVariableTable and LocalVariableTypeTable
2366 Classfile_LVT_Element* cf_lvtt;
2367 LocalVariableTableElement lvtt_elem;
2369 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2370 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2371 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2372 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2373 int index = hash(&lvtt_elem);
2374 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2375 if (entry == NULL) {
2376 if (_need_verify) {
2377 clear_hashtable(lvt_Hash);
2378 classfile_parse_error("LVTT entry for '%s' in class file %s "
2379 "does not match any LVT entry",
2380 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2381 CHECK_(nullHandle));
2382 }
2383 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2384 clear_hashtable(lvt_Hash);
2385 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2386 "entry for '%s' in class file %s",
2387 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2388 CHECK_(nullHandle));
2389 } else {
2390 // to add generic signatures into LocalVariableTable
2391 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2392 }
2393 }
2394 }
2395 clear_hashtable(lvt_Hash);
2396 }
2398 if (parsed_annotations.has_any_annotations())
2399 parsed_annotations.apply_to(m);
2400 *method_annotations = assemble_annotations(loader_data,
2401 runtime_visible_annotations,
2402 runtime_visible_annotations_length,
2403 runtime_invisible_annotations,
2404 runtime_invisible_annotations_length,
2405 CHECK_(nullHandle));
2406 *method_parameter_annotations = assemble_annotations(loader_data,
2407 runtime_visible_parameter_annotations,
2408 runtime_visible_parameter_annotations_length,
2409 runtime_invisible_parameter_annotations,
2410 runtime_invisible_parameter_annotations_length,
2411 CHECK_(nullHandle));
2412 *method_default_annotations = assemble_annotations(loader_data,
2413 annotation_default,
2414 annotation_default_length,
2415 NULL,
2416 0,
2417 CHECK_(nullHandle));
2418 *method_type_annotations = assemble_annotations(loader_data,
2419 runtime_visible_type_annotations,
2420 runtime_visible_type_annotations_length,
2421 runtime_invisible_type_annotations,
2422 runtime_invisible_type_annotations_length,
2423 CHECK_(nullHandle));
2425 if (name == vmSymbols::finalize_method_name() &&
2426 signature == vmSymbols::void_method_signature()) {
2427 if (m->is_empty_method()) {
2428 _has_empty_finalizer = true;
2429 } else {
2430 _has_finalizer = true;
2431 }
2432 }
2433 if (name == vmSymbols::object_initializer_name() &&
2434 signature == vmSymbols::void_method_signature() &&
2435 m->is_vanilla_constructor()) {
2436 _has_vanilla_constructor = true;
2437 }
2439 return m;
2440 }
2443 // The promoted_flags parameter is used to pass relevant access_flags
2444 // from the methods back up to the containing klass. These flag values
2445 // are added to klass's access_flags.
2447 Array<Method*>* ClassFileParser::parse_methods(ClassLoaderData* loader_data,
2448 constantPoolHandle cp,
2449 bool is_interface,
2450 AccessFlags* promoted_flags,
2451 bool* has_final_method,
2452 Array<AnnotationArray*>** methods_annotations,
2453 Array<AnnotationArray*>** methods_parameter_annotations,
2454 Array<AnnotationArray*>** methods_default_annotations,
2455 Array<AnnotationArray*>** methods_type_annotations,
2456 bool* has_default_methods,
2457 TRAPS) {
2458 ClassFileStream* cfs = stream();
2459 AnnotationArray* method_annotations = NULL;
2460 AnnotationArray* method_parameter_annotations = NULL;
2461 AnnotationArray* method_default_annotations = NULL;
2462 AnnotationArray* method_type_annotations = NULL;
2463 cfs->guarantee_more(2, CHECK_NULL); // length
2464 u2 length = cfs->get_u2_fast();
2465 if (length == 0) {
2466 return Universe::the_empty_method_array();
2467 } else {
2468 // FIXME: Handle leaks at later failures.
2469 Array<Method*>* methods = MetadataFactory::new_array<Method*>(loader_data, length, NULL, CHECK_NULL);
2471 HandleMark hm(THREAD);
2472 for (int index = 0; index < length; index++) {
2473 methodHandle method = parse_method(loader_data,
2474 cp, is_interface,
2475 promoted_flags,
2476 &method_annotations,
2477 &method_parameter_annotations,
2478 &method_default_annotations,
2479 &method_type_annotations,
2480 CHECK_NULL);
2482 if (method->is_final()) {
2483 *has_final_method = true;
2484 }
2485 if (is_interface && !method->is_abstract() && !method->is_static()) {
2486 // default method
2487 *has_default_methods = true;
2488 }
2489 methods->at_put(index, method());
2490 if (*methods_annotations == NULL) {
2491 *methods_annotations =
2492 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2493 }
2494 (*methods_annotations)->at_put(index, method_annotations);
2495 if (*methods_parameter_annotations == NULL) {
2496 *methods_parameter_annotations =
2497 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2498 }
2499 (*methods_parameter_annotations)->at_put(index, method_parameter_annotations);
2500 if (*methods_default_annotations == NULL) {
2501 *methods_default_annotations =
2502 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2503 }
2504 (*methods_default_annotations)->at_put(index, method_default_annotations);
2505 if (*methods_type_annotations == NULL) {
2506 *methods_type_annotations =
2507 MetadataFactory::new_array<AnnotationArray*>(loader_data, length, NULL, CHECK_NULL);
2508 }
2509 (*methods_type_annotations)->at_put(index, method_type_annotations);
2510 }
2512 if (_need_verify && length > 1) {
2513 // Check duplicated methods
2514 ResourceMark rm(THREAD);
2515 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2516 THREAD, NameSigHash*, HASH_ROW_SIZE);
2517 initialize_hashtable(names_and_sigs);
2518 bool dup = false;
2519 {
2520 debug_only(No_Safepoint_Verifier nsv;)
2521 for (int i = 0; i < length; i++) {
2522 Method* m = methods->at(i);
2523 // If no duplicates, add name/signature in hashtable names_and_sigs.
2524 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2525 dup = true;
2526 break;
2527 }
2528 }
2529 }
2530 if (dup) {
2531 classfile_parse_error("Duplicate method name&signature in class file %s",
2532 CHECK_NULL);
2533 }
2534 }
2535 return methods;
2536 }
2537 }
2540 Array<int>* ClassFileParser::sort_methods(ClassLoaderData* loader_data,
2541 Array<Method*>* methods,
2542 Array<AnnotationArray*>* methods_annotations,
2543 Array<AnnotationArray*>* methods_parameter_annotations,
2544 Array<AnnotationArray*>* methods_default_annotations,
2545 Array<AnnotationArray*>* methods_type_annotations,
2546 TRAPS) {
2547 int length = methods->length();
2548 // If JVMTI original method ordering or sharing is enabled we have to
2549 // remember the original class file ordering.
2550 // We temporarily use the vtable_index field in the Method* to store the
2551 // class file index, so we can read in after calling qsort.
2552 // Put the method ordering in the shared archive.
2553 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2554 for (int index = 0; index < length; index++) {
2555 Method* m = methods->at(index);
2556 assert(!m->valid_vtable_index(), "vtable index should not be set");
2557 m->set_vtable_index(index);
2558 }
2559 }
2560 // Sort method array by ascending method name (for faster lookups & vtable construction)
2561 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2562 Method::sort_methods(methods, methods_annotations,
2563 methods_parameter_annotations,
2564 methods_default_annotations,
2565 methods_type_annotations);
2567 // If JVMTI original method ordering or sharing is enabled construct int
2568 // array remembering the original ordering
2569 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2570 Array<int>* method_ordering = MetadataFactory::new_array<int>(loader_data, length, CHECK_NULL);
2571 for (int index = 0; index < length; index++) {
2572 Method* m = methods->at(index);
2573 int old_index = m->vtable_index();
2574 assert(old_index >= 0 && old_index < length, "invalid method index");
2575 method_ordering->at_put(index, old_index);
2576 m->set_vtable_index(Method::invalid_vtable_index);
2577 }
2578 return method_ordering;
2579 } else {
2580 return Universe::the_empty_int_array();
2581 }
2582 }
2585 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, TRAPS) {
2586 ClassFileStream* cfs = stream();
2587 cfs->guarantee_more(2, CHECK); // sourcefile_index
2588 u2 sourcefile_index = cfs->get_u2_fast();
2589 check_property(
2590 valid_cp_range(sourcefile_index, cp->length()) &&
2591 cp->tag_at(sourcefile_index).is_utf8(),
2592 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2593 sourcefile_index, CHECK);
2594 set_class_sourcefile(cp->symbol_at(sourcefile_index));
2595 }
2599 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2600 int length, TRAPS) {
2601 ClassFileStream* cfs = stream();
2602 u1* sde_buffer = cfs->get_u1_buffer();
2603 assert(sde_buffer != NULL, "null sde buffer");
2605 // Don't bother storing it if there is no way to retrieve it
2606 if (JvmtiExport::can_get_source_debug_extension()) {
2607 assert((length+1) > length, "Overflow checking");
2608 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2609 for (int i = 0; i < length; i++) {
2610 sde[i] = sde_buffer[i];
2611 }
2612 sde[length] = '\0';
2613 set_class_sde_buffer((char*)sde, length);
2614 }
2615 // Got utf8 string, set stream position forward
2616 cfs->skip_u1(length, CHECK);
2617 }
2620 // Inner classes can be static, private or protected (classic VM does this)
2621 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2623 // Return number of classes in the inner classes attribute table
2624 u2 ClassFileParser::parse_classfile_inner_classes_attribute(ClassLoaderData* loader_data,
2625 u1* inner_classes_attribute_start,
2626 bool parsed_enclosingmethod_attribute,
2627 u2 enclosing_method_class_index,
2628 u2 enclosing_method_method_index,
2629 constantPoolHandle cp,
2630 TRAPS) {
2631 ClassFileStream* cfs = stream();
2632 u1* current_mark = cfs->current();
2633 u2 length = 0;
2634 if (inner_classes_attribute_start != NULL) {
2635 cfs->set_current(inner_classes_attribute_start);
2636 cfs->guarantee_more(2, CHECK_0); // length
2637 length = cfs->get_u2_fast();
2638 }
2640 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2641 // method data:
2642 // [inner_class_info_index,
2643 // outer_class_info_index,
2644 // inner_name_index,
2645 // inner_class_access_flags,
2646 // ...
2647 // enclosing_method_class_index,
2648 // enclosing_method_method_index]
2649 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2650 // FIXME: Will leak on exceptions.
2651 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(loader_data, size, CHECK_0);
2652 int index = 0;
2653 int cp_size = cp->length();
2654 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2655 for (int n = 0; n < length; n++) {
2656 // Inner class index
2657 u2 inner_class_info_index = cfs->get_u2_fast();
2658 check_property(
2659 inner_class_info_index == 0 ||
2660 (valid_cp_range(inner_class_info_index, cp_size) &&
2661 is_klass_reference(cp, inner_class_info_index)),
2662 "inner_class_info_index %u has bad constant type in class file %s",
2663 inner_class_info_index, CHECK_0);
2664 // Outer class index
2665 u2 outer_class_info_index = cfs->get_u2_fast();
2666 check_property(
2667 outer_class_info_index == 0 ||
2668 (valid_cp_range(outer_class_info_index, cp_size) &&
2669 is_klass_reference(cp, outer_class_info_index)),
2670 "outer_class_info_index %u has bad constant type in class file %s",
2671 outer_class_info_index, CHECK_0);
2672 // Inner class name
2673 u2 inner_name_index = cfs->get_u2_fast();
2674 check_property(
2675 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2676 cp->tag_at(inner_name_index).is_utf8()),
2677 "inner_name_index %u has bad constant type in class file %s",
2678 inner_name_index, CHECK_0);
2679 if (_need_verify) {
2680 guarantee_property(inner_class_info_index != outer_class_info_index,
2681 "Class is both outer and inner class in class file %s", CHECK_0);
2682 }
2683 // Access flags
2684 AccessFlags inner_access_flags;
2685 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2686 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2687 // Set abstract bit for old class files for backward compatibility
2688 flags |= JVM_ACC_ABSTRACT;
2689 }
2690 verify_legal_class_modifiers(flags, CHECK_0);
2691 inner_access_flags.set_flags(flags);
2693 inner_classes->at_put(index++, inner_class_info_index);
2694 inner_classes->at_put(index++, outer_class_info_index);
2695 inner_classes->at_put(index++, inner_name_index);
2696 inner_classes->at_put(index++, inner_access_flags.as_short());
2697 }
2699 // 4347400: make sure there's no duplicate entry in the classes array
2700 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2701 for(int i = 0; i < length * 4; i += 4) {
2702 for(int j = i + 4; j < length * 4; j += 4) {
2703 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2704 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2705 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2706 inner_classes->at(i+3) != inner_classes->at(j+3)),
2707 "Duplicate entry in InnerClasses in class file %s",
2708 CHECK_0);
2709 }
2710 }
2711 }
2713 // Set EnclosingMethod class and method indexes.
2714 if (parsed_enclosingmethod_attribute) {
2715 inner_classes->at_put(index++, enclosing_method_class_index);
2716 inner_classes->at_put(index++, enclosing_method_method_index);
2717 }
2718 assert(index == size, "wrong size");
2720 // Update InstanceKlass with inner class info.
2721 set_class_inner_classes(inner_classes);
2723 // Restore buffer's current position.
2724 cfs->set_current(current_mark);
2726 return length;
2727 }
2729 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, TRAPS) {
2730 set_class_synthetic_flag(true);
2731 }
2733 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, TRAPS) {
2734 ClassFileStream* cfs = stream();
2735 u2 signature_index = cfs->get_u2(CHECK);
2736 check_property(
2737 valid_cp_range(signature_index, cp->length()) &&
2738 cp->tag_at(signature_index).is_utf8(),
2739 "Invalid constant pool index %u in Signature attribute in class file %s",
2740 signature_index, CHECK);
2741 set_class_generic_signature(cp->symbol_at(signature_index));
2742 }
2744 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(ClassLoaderData* loader_data,
2745 constantPoolHandle cp,
2746 u4 attribute_byte_length, TRAPS) {
2747 ClassFileStream* cfs = stream();
2748 u1* current_start = cfs->current();
2750 cfs->guarantee_more(2, CHECK); // length
2751 int attribute_array_length = cfs->get_u2_fast();
2753 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2754 "Short length on BootstrapMethods in class file %s",
2755 CHECK);
2757 // The attribute contains a counted array of counted tuples of shorts,
2758 // represending bootstrap specifiers:
2759 // length*{bootstrap_method_index, argument_count*{argument_index}}
2760 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2761 // operand_count = number of shorts in attr, except for leading length
2763 // The attribute is copied into a short[] array.
2764 // The array begins with a series of short[2] pairs, one for each tuple.
2765 int index_size = (attribute_array_length * 2);
2767 Array<u2>* operands = MetadataFactory::new_array<u2>(loader_data, index_size + operand_count, CHECK);
2769 int operand_fill_index = index_size;
2770 int cp_size = cp->length();
2772 for (int n = 0; n < attribute_array_length; n++) {
2773 // Store a 32-bit offset into the header of the operand array.
2774 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2776 // Read a bootstrap specifier.
2777 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2778 u2 bootstrap_method_index = cfs->get_u2_fast();
2779 u2 argument_count = cfs->get_u2_fast();
2780 check_property(
2781 valid_cp_range(bootstrap_method_index, cp_size) &&
2782 cp->tag_at(bootstrap_method_index).is_method_handle(),
2783 "bootstrap_method_index %u has bad constant type in class file %s",
2784 bootstrap_method_index,
2785 CHECK);
2786 operands->at_put(operand_fill_index++, bootstrap_method_index);
2787 operands->at_put(operand_fill_index++, argument_count);
2789 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2790 for (int j = 0; j < argument_count; j++) {
2791 u2 argument_index = cfs->get_u2_fast();
2792 check_property(
2793 valid_cp_range(argument_index, cp_size) &&
2794 cp->tag_at(argument_index).is_loadable_constant(),
2795 "argument_index %u has bad constant type in class file %s",
2796 argument_index,
2797 CHECK);
2798 operands->at_put(operand_fill_index++, argument_index);
2799 }
2800 }
2802 assert(operand_fill_index == operands->length(), "exact fill");
2803 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2805 u1* current_end = cfs->current();
2806 guarantee_property(current_end == current_start + attribute_byte_length,
2807 "Bad length on BootstrapMethods in class file %s",
2808 CHECK);
2810 cp->set_operands(operands);
2811 }
2813 void ClassFileParser::parse_classfile_attributes(ClassLoaderData* loader_data,
2814 constantPoolHandle cp,
2815 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2816 TRAPS) {
2817 ClassFileStream* cfs = stream();
2818 // Set inner classes attribute to default sentinel
2819 set_class_inner_classes(Universe::the_empty_short_array());
2820 cfs->guarantee_more(2, CHECK); // attributes_count
2821 u2 attributes_count = cfs->get_u2_fast();
2822 bool parsed_sourcefile_attribute = false;
2823 bool parsed_innerclasses_attribute = false;
2824 bool parsed_enclosingmethod_attribute = false;
2825 bool parsed_bootstrap_methods_attribute = false;
2826 u1* runtime_visible_annotations = NULL;
2827 int runtime_visible_annotations_length = 0;
2828 u1* runtime_invisible_annotations = NULL;
2829 int runtime_invisible_annotations_length = 0;
2830 u1* runtime_visible_type_annotations = NULL;
2831 int runtime_visible_type_annotations_length = 0;
2832 u1* runtime_invisible_type_annotations = NULL;
2833 int runtime_invisible_type_annotations_length = 0;
2834 u1* inner_classes_attribute_start = NULL;
2835 u4 inner_classes_attribute_length = 0;
2836 u2 enclosing_method_class_index = 0;
2837 u2 enclosing_method_method_index = 0;
2838 // Iterate over attributes
2839 while (attributes_count--) {
2840 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2841 u2 attribute_name_index = cfs->get_u2_fast();
2842 u4 attribute_length = cfs->get_u4_fast();
2843 check_property(
2844 valid_cp_range(attribute_name_index, cp->length()) &&
2845 cp->tag_at(attribute_name_index).is_utf8(),
2846 "Attribute name has bad constant pool index %u in class file %s",
2847 attribute_name_index, CHECK);
2848 Symbol* tag = cp->symbol_at(attribute_name_index);
2849 if (tag == vmSymbols::tag_source_file()) {
2850 // Check for SourceFile tag
2851 if (_need_verify) {
2852 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2853 }
2854 if (parsed_sourcefile_attribute) {
2855 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2856 } else {
2857 parsed_sourcefile_attribute = true;
2858 }
2859 parse_classfile_sourcefile_attribute(cp, CHECK);
2860 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2861 // Check for SourceDebugExtension tag
2862 parse_classfile_source_debug_extension_attribute(cp, (int)attribute_length, CHECK);
2863 } else if (tag == vmSymbols::tag_inner_classes()) {
2864 // Check for InnerClasses tag
2865 if (parsed_innerclasses_attribute) {
2866 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2867 } else {
2868 parsed_innerclasses_attribute = true;
2869 }
2870 inner_classes_attribute_start = cfs->get_u1_buffer();
2871 inner_classes_attribute_length = attribute_length;
2872 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2873 } else if (tag == vmSymbols::tag_synthetic()) {
2874 // Check for Synthetic tag
2875 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2876 if (attribute_length != 0) {
2877 classfile_parse_error(
2878 "Invalid Synthetic classfile attribute length %u in class file %s",
2879 attribute_length, CHECK);
2880 }
2881 parse_classfile_synthetic_attribute(cp, CHECK);
2882 } else if (tag == vmSymbols::tag_deprecated()) {
2883 // Check for Deprecatd tag - 4276120
2884 if (attribute_length != 0) {
2885 classfile_parse_error(
2886 "Invalid Deprecated classfile attribute length %u in class file %s",
2887 attribute_length, CHECK);
2888 }
2889 } else if (_major_version >= JAVA_1_5_VERSION) {
2890 if (tag == vmSymbols::tag_signature()) {
2891 if (attribute_length != 2) {
2892 classfile_parse_error(
2893 "Wrong Signature attribute length %u in class file %s",
2894 attribute_length, CHECK);
2895 }
2896 parse_classfile_signature_attribute(cp, CHECK);
2897 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2898 runtime_visible_annotations_length = attribute_length;
2899 runtime_visible_annotations = cfs->get_u1_buffer();
2900 assert(runtime_visible_annotations != NULL, "null visible annotations");
2901 parse_annotations(loader_data,
2902 runtime_visible_annotations,
2903 runtime_visible_annotations_length,
2904 cp,
2905 parsed_annotations,
2906 CHECK);
2907 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2908 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2909 runtime_invisible_annotations_length = attribute_length;
2910 runtime_invisible_annotations = cfs->get_u1_buffer();
2911 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2912 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2913 } else if (tag == vmSymbols::tag_enclosing_method()) {
2914 if (parsed_enclosingmethod_attribute) {
2915 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2916 } else {
2917 parsed_enclosingmethod_attribute = true;
2918 }
2919 cfs->guarantee_more(4, CHECK); // class_index, method_index
2920 enclosing_method_class_index = cfs->get_u2_fast();
2921 enclosing_method_method_index = cfs->get_u2_fast();
2922 if (enclosing_method_class_index == 0) {
2923 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2924 }
2925 // Validate the constant pool indices and types
2926 if (!cp->is_within_bounds(enclosing_method_class_index) ||
2927 !is_klass_reference(cp, enclosing_method_class_index)) {
2928 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2929 }
2930 if (enclosing_method_method_index != 0 &&
2931 (!cp->is_within_bounds(enclosing_method_method_index) ||
2932 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2933 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2934 }
2935 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2936 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2937 if (parsed_bootstrap_methods_attribute)
2938 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2939 parsed_bootstrap_methods_attribute = true;
2940 parse_classfile_bootstrap_methods_attribute(loader_data, cp, attribute_length, CHECK);
2941 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2942 runtime_visible_type_annotations_length = attribute_length;
2943 runtime_visible_type_annotations = cfs->get_u1_buffer();
2944 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2945 // No need for the VM to parse Type annotations
2946 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2947 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2948 runtime_invisible_type_annotations_length = attribute_length;
2949 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2950 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2951 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2952 } else {
2953 // Unknown attribute
2954 cfs->skip_u1(attribute_length, CHECK);
2955 }
2956 } else {
2957 // Unknown attribute
2958 cfs->skip_u1(attribute_length, CHECK);
2959 }
2960 }
2961 AnnotationArray* annotations = assemble_annotations(loader_data,
2962 runtime_visible_annotations,
2963 runtime_visible_annotations_length,
2964 runtime_invisible_annotations,
2965 runtime_invisible_annotations_length,
2966 CHECK);
2967 set_class_annotations(annotations);
2968 AnnotationArray* type_annotations = assemble_annotations(loader_data,
2969 runtime_visible_type_annotations,
2970 runtime_visible_type_annotations_length,
2971 runtime_invisible_type_annotations,
2972 runtime_invisible_type_annotations_length,
2973 CHECK);
2974 set_class_type_annotations(type_annotations);
2976 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2977 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2978 loader_data,
2979 inner_classes_attribute_start,
2980 parsed_innerclasses_attribute,
2981 enclosing_method_class_index,
2982 enclosing_method_method_index,
2983 cp, CHECK);
2984 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2985 guarantee_property(
2986 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2987 "Wrong InnerClasses attribute length in class file %s", CHECK);
2988 }
2989 }
2991 if (_max_bootstrap_specifier_index >= 0) {
2992 guarantee_property(parsed_bootstrap_methods_attribute,
2993 "Missing BootstrapMethods attribute in class file %s", CHECK);
2994 }
2995 }
2997 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2998 if (_synthetic_flag)
2999 k->set_is_synthetic();
3000 if (_sourcefile != NULL) {
3001 _sourcefile->increment_refcount();
3002 k->set_source_file_name(_sourcefile);
3003 }
3004 if (_generic_signature != NULL) {
3005 _generic_signature->increment_refcount();
3006 k->set_generic_signature(_generic_signature);
3007 }
3008 if (_sde_buffer != NULL) {
3009 k->set_source_debug_extension(_sde_buffer, _sde_length);
3010 }
3011 k->set_inner_classes(_inner_classes);
3012 if (_annotations != NULL) {
3013 k->annotations()->set_class_annotations(_annotations);
3014 }
3015 }
3017 AnnotationArray* ClassFileParser::assemble_annotations(ClassLoaderData* loader_data,
3018 u1* runtime_visible_annotations,
3019 int runtime_visible_annotations_length,
3020 u1* runtime_invisible_annotations,
3021 int runtime_invisible_annotations_length, TRAPS) {
3022 AnnotationArray* annotations = NULL;
3023 if (runtime_visible_annotations != NULL ||
3024 runtime_invisible_annotations != NULL) {
3025 annotations = MetadataFactory::new_array<u1>(loader_data,
3026 runtime_visible_annotations_length +
3027 runtime_invisible_annotations_length,
3028 CHECK_(annotations));
3029 if (runtime_visible_annotations != NULL) {
3030 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3031 annotations->at_put(i, runtime_visible_annotations[i]);
3032 }
3033 }
3034 if (runtime_invisible_annotations != NULL) {
3035 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3036 int append = runtime_visible_annotations_length+i;
3037 annotations->at_put(append, runtime_invisible_annotations[i]);
3038 }
3039 }
3040 }
3041 return annotations;
3042 }
3045 #ifndef PRODUCT
3046 static void parseAndPrintGenericSignatures(
3047 instanceKlassHandle this_klass, TRAPS) {
3048 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3049 ResourceMark rm;
3051 if (this_klass->generic_signature() != NULL) {
3052 using namespace generic;
3053 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3055 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3056 spec->print_on(tty);
3058 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3059 Method* m = this_klass->methods()->at(i);
3060 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3061 Symbol* sig = m->generic_signature();
3062 if (sig == NULL) {
3063 sig = m->signature();
3064 }
3065 tty->print_cr("Parsing %s", sig->as_C_string());
3066 method_spec->print_on(tty);
3067 }
3068 }
3069 }
3070 #endif // ndef PRODUCT
3073 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3074 ClassLoaderData* loader_data,
3075 Handle protection_domain,
3076 KlassHandle host_klass,
3077 GrowableArray<Handle>* cp_patches,
3078 TempNewSymbol& parsed_name,
3079 bool verify,
3080 TRAPS) {
3082 // When a retransformable agent is attached, JVMTI caches the
3083 // class bytes that existed before the first retransformation.
3084 // If RedefineClasses() was used before the retransformable
3085 // agent attached, then the cached class bytes may not be the
3086 // original class bytes.
3087 unsigned char *cached_class_file_bytes = NULL;
3088 jint cached_class_file_length;
3089 Handle class_loader(THREAD, loader_data->class_loader());
3090 bool has_default_methods = false;
3091 ResourceMark rm(THREAD);
3093 ClassFileStream* cfs = stream();
3094 // Timing
3095 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3096 JavaThread* jt = (JavaThread*) THREAD;
3098 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3099 ClassLoader::perf_class_parse_selftime(),
3100 NULL,
3101 jt->get_thread_stat()->perf_recursion_counts_addr(),
3102 jt->get_thread_stat()->perf_timers_addr(),
3103 PerfClassTraceTime::PARSE_CLASS);
3105 init_parsed_class_attributes();
3107 if (JvmtiExport::should_post_class_file_load_hook()) {
3108 // Get the cached class file bytes (if any) from the class that
3109 // is being redefined or retransformed. We use jvmti_thread_state()
3110 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3111 // a JvmtiThreadState any earlier than necessary. This will help
3112 // avoid the bug described by 7126851.
3113 JvmtiThreadState *state = jt->jvmti_thread_state();
3114 if (state != NULL) {
3115 KlassHandle *h_class_being_redefined =
3116 state->get_class_being_redefined();
3117 if (h_class_being_redefined != NULL) {
3118 instanceKlassHandle ikh_class_being_redefined =
3119 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3120 cached_class_file_bytes =
3121 ikh_class_being_redefined->get_cached_class_file_bytes();
3122 cached_class_file_length =
3123 ikh_class_being_redefined->get_cached_class_file_len();
3124 }
3125 }
3127 unsigned char* ptr = cfs->buffer();
3128 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3130 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3131 &ptr, &end_ptr,
3132 &cached_class_file_bytes,
3133 &cached_class_file_length);
3135 if (ptr != cfs->buffer()) {
3136 // JVMTI agent has modified class file data.
3137 // Set new class file stream using JVMTI agent modified
3138 // class file data.
3139 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3140 set_stream(cfs);
3141 }
3142 }
3144 _host_klass = host_klass;
3145 _cp_patches = cp_patches;
3147 instanceKlassHandle nullHandle;
3149 // Figure out whether we can skip format checking (matching classic VM behavior)
3150 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3152 // Set the verify flag in stream
3153 cfs->set_verify(_need_verify);
3155 // Save the class file name for easier error message printing.
3156 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3158 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3159 // Magic value
3160 u4 magic = cfs->get_u4_fast();
3161 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3162 "Incompatible magic value %u in class file %s",
3163 magic, CHECK_(nullHandle));
3165 // Version numbers
3166 u2 minor_version = cfs->get_u2_fast();
3167 u2 major_version = cfs->get_u2_fast();
3169 // Check version numbers - we check this even with verifier off
3170 if (!is_supported_version(major_version, minor_version)) {
3171 if (name == NULL) {
3172 Exceptions::fthrow(
3173 THREAD_AND_LOCATION,
3174 vmSymbols::java_lang_UnsupportedClassVersionError(),
3175 "Unsupported major.minor version %u.%u",
3176 major_version,
3177 minor_version);
3178 } else {
3179 ResourceMark rm(THREAD);
3180 Exceptions::fthrow(
3181 THREAD_AND_LOCATION,
3182 vmSymbols::java_lang_UnsupportedClassVersionError(),
3183 "%s : Unsupported major.minor version %u.%u",
3184 name->as_C_string(),
3185 major_version,
3186 minor_version);
3187 }
3188 return nullHandle;
3189 }
3191 _major_version = major_version;
3192 _minor_version = minor_version;
3195 // Check if verification needs to be relaxed for this class file
3196 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3197 _relax_verify = Verifier::relax_verify_for(class_loader());
3199 // Constant pool
3200 constantPoolHandle cp = parse_constant_pool(loader_data, CHECK_(nullHandle));
3201 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
3203 int cp_size = cp->length();
3205 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3207 // Access flags
3208 AccessFlags access_flags;
3209 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3211 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3212 // Set abstract bit for old class files for backward compatibility
3213 flags |= JVM_ACC_ABSTRACT;
3214 }
3215 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3216 access_flags.set_flags(flags);
3218 // This class and superclass
3219 instanceKlassHandle super_klass;
3220 u2 this_class_index = cfs->get_u2_fast();
3221 check_property(
3222 valid_cp_range(this_class_index, cp_size) &&
3223 cp->tag_at(this_class_index).is_unresolved_klass(),
3224 "Invalid this class index %u in constant pool in class file %s",
3225 this_class_index, CHECK_(nullHandle));
3227 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3228 assert(class_name != NULL, "class_name can't be null");
3230 // It's important to set parsed_name *before* resolving the super class.
3231 // (it's used for cleanup by the caller if parsing fails)
3232 parsed_name = class_name;
3233 // parsed_name is returned and can be used if there's an error, so add to
3234 // its reference count. Caller will decrement the refcount.
3235 parsed_name->increment_refcount();
3237 // Update _class_name which could be null previously to be class_name
3238 _class_name = class_name;
3240 // Don't need to check whether this class name is legal or not.
3241 // It has been checked when constant pool is parsed.
3242 // However, make sure it is not an array type.
3243 if (_need_verify) {
3244 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3245 "Bad class name in class file %s",
3246 CHECK_(nullHandle));
3247 }
3249 Klass* preserve_this_klass; // for storing result across HandleMark
3251 // release all handles when parsing is done
3252 { HandleMark hm(THREAD);
3254 // Checks if name in class file matches requested name
3255 if (name != NULL && class_name != name) {
3256 ResourceMark rm(THREAD);
3257 Exceptions::fthrow(
3258 THREAD_AND_LOCATION,
3259 vmSymbols::java_lang_NoClassDefFoundError(),
3260 "%s (wrong name: %s)",
3261 name->as_C_string(),
3262 class_name->as_C_string()
3263 );
3264 return nullHandle;
3265 }
3267 if (TraceClassLoadingPreorder) {
3268 tty->print("[Loading %s", name->as_klass_external_name());
3269 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3270 tty->print_cr("]");
3271 }
3273 u2 super_class_index = cfs->get_u2_fast();
3274 if (super_class_index == 0) {
3275 check_property(class_name == vmSymbols::java_lang_Object(),
3276 "Invalid superclass index %u in class file %s",
3277 super_class_index,
3278 CHECK_(nullHandle));
3279 } else {
3280 check_property(valid_cp_range(super_class_index, cp_size) &&
3281 is_klass_reference(cp, super_class_index),
3282 "Invalid superclass index %u in class file %s",
3283 super_class_index,
3284 CHECK_(nullHandle));
3285 // The class name should be legal because it is checked when parsing constant pool.
3286 // However, make sure it is not an array type.
3287 bool is_array = false;
3288 if (cp->tag_at(super_class_index).is_klass()) {
3289 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
3290 if (_need_verify)
3291 is_array = super_klass->oop_is_array();
3292 } else if (_need_verify) {
3293 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3294 }
3295 if (_need_verify) {
3296 guarantee_property(!is_array,
3297 "Bad superclass name in class file %s", CHECK_(nullHandle));
3298 }
3299 }
3301 // Interfaces
3302 u2 itfs_len = cfs->get_u2_fast();
3303 Array<Klass*>* local_interfaces;
3304 if (itfs_len == 0) {
3305 local_interfaces = Universe::the_empty_klass_array();
3306 } else {
3307 local_interfaces = parse_interfaces(
3308 cp, itfs_len, loader_data, protection_domain, _class_name,
3309 &has_default_methods, CHECK_(nullHandle));
3310 }
3312 u2 java_fields_count = 0;
3313 // Fields (offsets are filled in later)
3314 FieldAllocationCount fac;
3315 Array<AnnotationArray*>* fields_annotations = NULL;
3316 Array<AnnotationArray*>* fields_type_annotations = NULL;
3317 Array<u2>* fields = parse_fields(loader_data, class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
3318 &fields_type_annotations,
3319 &java_fields_count,
3320 CHECK_(nullHandle));
3321 // Methods
3322 bool has_final_method = false;
3323 AccessFlags promoted_flags;
3324 promoted_flags.set_flags(0);
3325 // These need to be oop pointers because they are allocated lazily
3326 // inside parse_methods inside a nested HandleMark
3327 Array<AnnotationArray*>* methods_annotations = NULL;
3328 Array<AnnotationArray*>* methods_parameter_annotations = NULL;
3329 Array<AnnotationArray*>* methods_default_annotations = NULL;
3330 Array<AnnotationArray*>* methods_type_annotations = NULL;
3331 Array<Method*>* methods = parse_methods(loader_data,
3332 cp, access_flags.is_interface(),
3333 &promoted_flags,
3334 &has_final_method,
3335 &methods_annotations,
3336 &methods_parameter_annotations,
3337 &methods_default_annotations,
3338 &methods_type_annotations,
3339 &has_default_methods,
3340 CHECK_(nullHandle));
3342 // Additional attributes
3343 ClassAnnotationCollector parsed_annotations;
3344 parse_classfile_attributes(loader_data, cp, &parsed_annotations, CHECK_(nullHandle));
3346 // Make sure this is the end of class file stream
3347 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3349 // We check super class after class file is parsed and format is checked
3350 if (super_class_index > 0 && super_klass.is_null()) {
3351 Symbol* sk = cp->klass_name_at(super_class_index);
3352 if (access_flags.is_interface()) {
3353 // Before attempting to resolve the superclass, check for class format
3354 // errors not checked yet.
3355 guarantee_property(sk == vmSymbols::java_lang_Object(),
3356 "Interfaces must have java.lang.Object as superclass in class file %s",
3357 CHECK_(nullHandle));
3358 }
3359 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3360 class_loader,
3361 protection_domain,
3362 true,
3363 CHECK_(nullHandle));
3365 KlassHandle kh (THREAD, k);
3366 super_klass = instanceKlassHandle(THREAD, kh());
3367 }
3368 if (super_klass.not_null()) {
3370 if (super_klass->has_default_methods()) {
3371 has_default_methods = true;
3372 }
3374 if (super_klass->is_interface()) {
3375 ResourceMark rm(THREAD);
3376 Exceptions::fthrow(
3377 THREAD_AND_LOCATION,
3378 vmSymbols::java_lang_IncompatibleClassChangeError(),
3379 "class %s has interface %s as super class",
3380 class_name->as_klass_external_name(),
3381 super_klass->external_name()
3382 );
3383 return nullHandle;
3384 }
3385 // Make sure super class is not final
3386 if (super_klass->is_final()) {
3387 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3388 }
3389 }
3391 // Compute the transitive list of all unique interfaces implemented by this class
3392 Array<Klass*>* transitive_interfaces = compute_transitive_interfaces(loader_data, super_klass, local_interfaces, CHECK_(nullHandle));
3394 // sort methods
3395 Array<int>* method_ordering = sort_methods(loader_data,
3396 methods,
3397 methods_annotations,
3398 methods_parameter_annotations,
3399 methods_default_annotations,
3400 methods_type_annotations,
3401 CHECK_(nullHandle));
3403 // promote flags from parse_methods() to the klass' flags
3404 access_flags.add_promoted_flags(promoted_flags.as_int());
3406 // Size of Java vtable (in words)
3407 int vtable_size = 0;
3408 int itable_size = 0;
3409 int num_miranda_methods = 0;
3411 GrowableArray<Method*> all_mirandas(20);
3413 klassVtable::compute_vtable_size_and_num_mirandas(
3414 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3415 access_flags, class_loader, class_name, local_interfaces,
3416 CHECK_(nullHandle));
3418 // Size of Java itable (in words)
3419 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3421 // get the padding width from the option
3422 // TODO: Ask VM about specific CPU we are running on
3423 int pad_size = ContendedPaddingWidth;
3425 // Field size and offset computation
3426 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3427 #ifndef PRODUCT
3428 int orig_nonstatic_field_size = 0;
3429 #endif
3430 int next_static_oop_offset;
3431 int next_static_double_offset;
3432 int next_static_word_offset;
3433 int next_static_short_offset;
3434 int next_static_byte_offset;
3435 int next_static_padded_offset;
3436 int next_nonstatic_oop_offset;
3437 int next_nonstatic_double_offset;
3438 int next_nonstatic_word_offset;
3439 int next_nonstatic_short_offset;
3440 int next_nonstatic_byte_offset;
3441 int next_nonstatic_type_offset;
3442 int first_nonstatic_oop_offset;
3443 int first_nonstatic_field_offset;
3444 int next_nonstatic_field_offset;
3445 int next_nonstatic_padded_offset;
3447 // Count the contended fields by type.
3448 int static_contended_count = 0;
3449 int nonstatic_contended_count = 0;
3450 FieldAllocationCount fac_contended;
3451 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3452 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3453 if (fs.is_contended()) {
3454 fac_contended.count[atype]++;
3455 if (fs.access_flags().is_static()) {
3456 static_contended_count++;
3457 } else {
3458 nonstatic_contended_count++;
3459 }
3460 }
3461 }
3462 int contended_count = static_contended_count + nonstatic_contended_count;
3465 // Calculate the starting byte offsets
3466 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3468 // class is contended, pad before all the fields
3469 if (parsed_annotations.is_contended()) {
3470 next_static_oop_offset += pad_size;
3471 }
3473 next_static_double_offset = next_static_oop_offset +
3474 ((fac.count[STATIC_OOP] - fac_contended.count[STATIC_OOP]) * heapOopSize);
3475 if ( fac.count[STATIC_DOUBLE] &&
3476 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3477 Universe::field_type_should_be_aligned(T_LONG)) ) {
3478 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3479 }
3481 next_static_word_offset = next_static_double_offset +
3482 ((fac.count[STATIC_DOUBLE] - fac_contended.count[STATIC_DOUBLE]) * BytesPerLong);
3483 next_static_short_offset = next_static_word_offset +
3484 ((fac.count[STATIC_WORD] - fac_contended.count[STATIC_WORD]) * BytesPerInt);
3485 next_static_byte_offset = next_static_short_offset +
3486 ((fac.count[STATIC_SHORT] - fac_contended.count[STATIC_SHORT]) * BytesPerShort);
3487 next_static_padded_offset = next_static_byte_offset +
3488 ((fac.count[STATIC_BYTE] - fac_contended.count[STATIC_BYTE]) * 1);
3490 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3491 nonstatic_field_size * heapOopSize;
3493 // class is contended, pad before all the fields
3494 if (parsed_annotations.is_contended()) {
3495 first_nonstatic_field_offset += pad_size;
3496 }
3498 next_nonstatic_field_offset = first_nonstatic_field_offset;
3500 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3501 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3502 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3503 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3504 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3506 bool super_has_nonstatic_fields =
3507 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3508 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3509 ((nonstatic_double_count + nonstatic_word_count +
3510 nonstatic_short_count + nonstatic_byte_count +
3511 nonstatic_oop_count) != 0);
3514 // Prepare list of oops for oop map generation.
3515 int* nonstatic_oop_offsets;
3516 unsigned int* nonstatic_oop_counts;
3517 unsigned int nonstatic_oop_map_count = 0;
3519 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3520 THREAD, int, nonstatic_oop_count + 1);
3521 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3522 THREAD, unsigned int, nonstatic_oop_count + 1);
3524 first_nonstatic_oop_offset = 0; // will be set for first oop field
3526 #ifndef PRODUCT
3527 if( PrintCompactFieldsSavings ) {
3528 next_nonstatic_double_offset = next_nonstatic_field_offset +
3529 (nonstatic_oop_count * heapOopSize);
3530 if ( nonstatic_double_count > 0 ) {
3531 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3532 }
3533 next_nonstatic_word_offset = next_nonstatic_double_offset +
3534 (nonstatic_double_count * BytesPerLong);
3535 next_nonstatic_short_offset = next_nonstatic_word_offset +
3536 (nonstatic_word_count * BytesPerInt);
3537 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3538 (nonstatic_short_count * BytesPerShort);
3539 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3540 nonstatic_byte_count ), heapOopSize );
3541 orig_nonstatic_field_size = nonstatic_field_size +
3542 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3543 }
3544 #endif
3545 bool compact_fields = CompactFields;
3546 int allocation_style = FieldsAllocationStyle;
3547 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3548 assert(false, "0 <= FieldsAllocationStyle <= 2");
3549 allocation_style = 1; // Optimistic
3550 }
3552 // The next classes have predefined hard-coded fields offsets
3553 // (see in JavaClasses::compute_hard_coded_offsets()).
3554 // Use default fields allocation order for them.
3555 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3556 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3557 class_name == vmSymbols::java_lang_Class() ||
3558 class_name == vmSymbols::java_lang_ClassLoader() ||
3559 class_name == vmSymbols::java_lang_ref_Reference() ||
3560 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3561 class_name == vmSymbols::java_lang_StackTraceElement() ||
3562 class_name == vmSymbols::java_lang_String() ||
3563 class_name == vmSymbols::java_lang_Throwable() ||
3564 class_name == vmSymbols::java_lang_Boolean() ||
3565 class_name == vmSymbols::java_lang_Character() ||
3566 class_name == vmSymbols::java_lang_Float() ||
3567 class_name == vmSymbols::java_lang_Double() ||
3568 class_name == vmSymbols::java_lang_Byte() ||
3569 class_name == vmSymbols::java_lang_Short() ||
3570 class_name == vmSymbols::java_lang_Integer() ||
3571 class_name == vmSymbols::java_lang_Long())) {
3572 allocation_style = 0; // Allocate oops first
3573 compact_fields = false; // Don't compact fields
3574 }
3576 if( allocation_style == 0 ) {
3577 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3578 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3579 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3580 (nonstatic_oop_count * heapOopSize);
3581 } else if( allocation_style == 1 ) {
3582 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3583 next_nonstatic_double_offset = next_nonstatic_field_offset;
3584 } else if( allocation_style == 2 ) {
3585 // Fields allocation: oops fields in super and sub classes are together.
3586 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3587 super_klass->nonstatic_oop_map_size() > 0 ) {
3588 int map_count = super_klass->nonstatic_oop_map_count();
3589 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3590 OopMapBlock* last_map = first_map + map_count - 1;
3591 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3592 if (next_offset == next_nonstatic_field_offset) {
3593 allocation_style = 0; // allocate oops first
3594 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3595 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3596 (nonstatic_oop_count * heapOopSize);
3597 }
3598 }
3599 if( allocation_style == 2 ) {
3600 allocation_style = 1; // allocate oops last
3601 next_nonstatic_double_offset = next_nonstatic_field_offset;
3602 }
3603 } else {
3604 ShouldNotReachHere();
3605 }
3607 int nonstatic_oop_space_count = 0;
3608 int nonstatic_word_space_count = 0;
3609 int nonstatic_short_space_count = 0;
3610 int nonstatic_byte_space_count = 0;
3611 int nonstatic_oop_space_offset;
3612 int nonstatic_word_space_offset;
3613 int nonstatic_short_space_offset;
3614 int nonstatic_byte_space_offset;
3616 if( nonstatic_double_count > 0 ) {
3617 int offset = next_nonstatic_double_offset;
3618 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3619 if( compact_fields && offset != next_nonstatic_double_offset ) {
3620 // Allocate available fields into the gap before double field.
3621 int length = next_nonstatic_double_offset - offset;
3622 assert(length == BytesPerInt, "");
3623 nonstatic_word_space_offset = offset;
3624 if( nonstatic_word_count > 0 ) {
3625 nonstatic_word_count -= 1;
3626 nonstatic_word_space_count = 1; // Only one will fit
3627 length -= BytesPerInt;
3628 offset += BytesPerInt;
3629 }
3630 nonstatic_short_space_offset = offset;
3631 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3632 nonstatic_short_count -= 1;
3633 nonstatic_short_space_count += 1;
3634 length -= BytesPerShort;
3635 offset += BytesPerShort;
3636 }
3637 nonstatic_byte_space_offset = offset;
3638 while( length > 0 && nonstatic_byte_count > 0 ) {
3639 nonstatic_byte_count -= 1;
3640 nonstatic_byte_space_count += 1;
3641 length -= 1;
3642 }
3643 // Allocate oop field in the gap if there are no other fields for that.
3644 nonstatic_oop_space_offset = offset;
3645 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3646 allocation_style != 0 ) { // when oop fields not first
3647 nonstatic_oop_count -= 1;
3648 nonstatic_oop_space_count = 1; // Only one will fit
3649 length -= heapOopSize;
3650 offset += heapOopSize;
3651 }
3652 }
3653 }
3655 next_nonstatic_word_offset = next_nonstatic_double_offset +
3656 (nonstatic_double_count * BytesPerLong);
3657 next_nonstatic_short_offset = next_nonstatic_word_offset +
3658 (nonstatic_word_count * BytesPerInt);
3659 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3660 (nonstatic_short_count * BytesPerShort);
3661 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3662 nonstatic_byte_count;
3664 // let oops jump before padding with this allocation style
3665 if( allocation_style == 1 ) {
3666 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3667 if( nonstatic_oop_count > 0 ) {
3668 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3669 }
3670 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3671 }
3673 // Iterate over fields again and compute correct offsets.
3674 // The field allocation type was temporarily stored in the offset slot.
3675 // oop fields are located before non-oop fields (static and non-static).
3676 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3678 // skip already laid out fields
3679 if (fs.is_offset_set()) continue;
3681 // contended fields are handled below
3682 if (fs.is_contended()) continue;
3684 int real_offset;
3685 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3687 // pack the rest of the fields
3688 switch (atype) {
3689 case STATIC_OOP:
3690 real_offset = next_static_oop_offset;
3691 next_static_oop_offset += heapOopSize;
3692 break;
3693 case STATIC_BYTE:
3694 real_offset = next_static_byte_offset;
3695 next_static_byte_offset += 1;
3696 break;
3697 case STATIC_SHORT:
3698 real_offset = next_static_short_offset;
3699 next_static_short_offset += BytesPerShort;
3700 break;
3701 case STATIC_WORD:
3702 real_offset = next_static_word_offset;
3703 next_static_word_offset += BytesPerInt;
3704 break;
3705 case STATIC_DOUBLE:
3706 real_offset = next_static_double_offset;
3707 next_static_double_offset += BytesPerLong;
3708 break;
3709 case NONSTATIC_OOP:
3710 if( nonstatic_oop_space_count > 0 ) {
3711 real_offset = nonstatic_oop_space_offset;
3712 nonstatic_oop_space_offset += heapOopSize;
3713 nonstatic_oop_space_count -= 1;
3714 } else {
3715 real_offset = next_nonstatic_oop_offset;
3716 next_nonstatic_oop_offset += heapOopSize;
3717 }
3718 // Update oop maps
3719 if( nonstatic_oop_map_count > 0 &&
3720 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3721 real_offset -
3722 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3723 heapOopSize ) {
3724 // Extend current oop map
3725 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3726 } else {
3727 // Create new oop map
3728 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3729 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3730 nonstatic_oop_map_count += 1;
3731 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3732 first_nonstatic_oop_offset = real_offset;
3733 }
3734 }
3735 break;
3736 case NONSTATIC_BYTE:
3737 if( nonstatic_byte_space_count > 0 ) {
3738 real_offset = nonstatic_byte_space_offset;
3739 nonstatic_byte_space_offset += 1;
3740 nonstatic_byte_space_count -= 1;
3741 } else {
3742 real_offset = next_nonstatic_byte_offset;
3743 next_nonstatic_byte_offset += 1;
3744 }
3745 break;
3746 case NONSTATIC_SHORT:
3747 if( nonstatic_short_space_count > 0 ) {
3748 real_offset = nonstatic_short_space_offset;
3749 nonstatic_short_space_offset += BytesPerShort;
3750 nonstatic_short_space_count -= 1;
3751 } else {
3752 real_offset = next_nonstatic_short_offset;
3753 next_nonstatic_short_offset += BytesPerShort;
3754 }
3755 break;
3756 case NONSTATIC_WORD:
3757 if( nonstatic_word_space_count > 0 ) {
3758 real_offset = nonstatic_word_space_offset;
3759 nonstatic_word_space_offset += BytesPerInt;
3760 nonstatic_word_space_count -= 1;
3761 } else {
3762 real_offset = next_nonstatic_word_offset;
3763 next_nonstatic_word_offset += BytesPerInt;
3764 }
3765 break;
3766 case NONSTATIC_DOUBLE:
3767 real_offset = next_nonstatic_double_offset;
3768 next_nonstatic_double_offset += BytesPerLong;
3769 break;
3770 default:
3771 ShouldNotReachHere();
3772 }
3773 fs.set_offset(real_offset);
3774 }
3777 // Handle the contended cases.
3778 //
3779 // Each contended field should not intersect the cache line with another contended field.
3780 // In the absence of alignment information, we end up with pessimistically separating
3781 // the fields with full-width padding.
3782 //
3783 // Additionally, this should not break alignment for the fields, so we round the alignment up
3784 // for each field.
3785 if (contended_count > 0) {
3787 // if there is at least one contended field, we need to have pre-padding for them
3788 if (nonstatic_contended_count > 0) {
3789 next_nonstatic_padded_offset += pad_size;
3790 }
3792 // collect all contended groups
3793 BitMap bm(cp->size());
3794 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3795 // skip already laid out fields
3796 if (fs.is_offset_set()) continue;
3798 if (fs.is_contended()) {
3799 bm.set_bit(fs.contended_group());
3800 }
3801 }
3803 int current_group = -1;
3804 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3806 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3808 // skip already laid out fields
3809 if (fs.is_offset_set()) continue;
3811 // skip non-contended fields and fields from different group
3812 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3814 // handle statics below
3815 if (fs.access_flags().is_static()) continue;
3817 int real_offset;
3818 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3820 switch (atype) {
3821 case NONSTATIC_BYTE:
3822 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3823 real_offset = next_nonstatic_padded_offset;
3824 next_nonstatic_padded_offset += 1;
3825 break;
3827 case NONSTATIC_SHORT:
3828 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3829 real_offset = next_nonstatic_padded_offset;
3830 next_nonstatic_padded_offset += BytesPerShort;
3831 break;
3833 case NONSTATIC_WORD:
3834 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3835 real_offset = next_nonstatic_padded_offset;
3836 next_nonstatic_padded_offset += BytesPerInt;
3837 break;
3839 case NONSTATIC_DOUBLE:
3840 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3841 real_offset = next_nonstatic_padded_offset;
3842 next_nonstatic_padded_offset += BytesPerLong;
3843 break;
3845 case NONSTATIC_OOP:
3846 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3847 real_offset = next_nonstatic_padded_offset;
3848 next_nonstatic_padded_offset += heapOopSize;
3850 // Create new oop map
3851 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3852 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3853 nonstatic_oop_map_count += 1;
3854 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3855 first_nonstatic_oop_offset = real_offset;
3856 }
3857 break;
3859 default:
3860 ShouldNotReachHere();
3861 }
3863 if (fs.contended_group() == 0) {
3864 // Contended group defines the equivalence class over the fields:
3865 // the fields within the same contended group are not inter-padded.
3866 // The only exception is default group, which does not incur the
3867 // equivalence, and so requires intra-padding.
3868 next_nonstatic_padded_offset += pad_size;
3869 }
3871 fs.set_offset(real_offset);
3872 } // for
3874 // Start laying out the next group.
3875 // Note that this will effectively pad the last group in the back;
3876 // this is expected to alleviate memory contention effects for
3877 // subclass fields and/or adjacent object.
3878 // If this was the default group, the padding is already in place.
3879 if (current_group != 0) {
3880 next_nonstatic_padded_offset += pad_size;
3881 }
3882 }
3884 // handle static fields
3886 // if there is at least one contended field, we need to have pre-padding for them
3887 if (static_contended_count > 0) {
3888 next_static_padded_offset += pad_size;
3889 }
3891 current_group = -1;
3892 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3894 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3896 // skip already laid out fields
3897 if (fs.is_offset_set()) continue;
3899 // skip non-contended fields and fields from different group
3900 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3902 // non-statics already handled above
3903 if (!fs.access_flags().is_static()) continue;
3905 int real_offset;
3906 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3908 switch (atype) {
3910 case STATIC_BYTE:
3911 next_static_padded_offset = align_size_up(next_static_padded_offset, 1);
3912 real_offset = next_static_padded_offset;
3913 next_static_padded_offset += 1;
3914 break;
3916 case STATIC_SHORT:
3917 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerShort);
3918 real_offset = next_static_padded_offset;
3919 next_static_padded_offset += BytesPerShort;
3920 break;
3922 case STATIC_WORD:
3923 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerInt);
3924 real_offset = next_static_padded_offset;
3925 next_static_padded_offset += BytesPerInt;
3926 break;
3928 case STATIC_DOUBLE:
3929 next_static_padded_offset = align_size_up(next_static_padded_offset, BytesPerLong);
3930 real_offset = next_static_padded_offset;
3931 next_static_padded_offset += BytesPerLong;
3932 break;
3934 case STATIC_OOP:
3935 next_static_padded_offset = align_size_up(next_static_padded_offset, heapOopSize);
3936 real_offset = next_static_padded_offset;
3937 next_static_padded_offset += heapOopSize;
3938 break;
3940 default:
3941 ShouldNotReachHere();
3942 }
3944 if (fs.contended_group() == 0) {
3945 // Contended group defines the equivalence class over the fields:
3946 // the fields within the same contended group are not inter-padded.
3947 // The only exception is default group, which does not incur the
3948 // equivalence, and so requires intra-padding.
3949 next_static_padded_offset += pad_size;
3950 }
3952 fs.set_offset(real_offset);
3953 } // for
3955 // Start laying out the next group.
3956 // Note that this will effectively pad the last group in the back;
3957 // this is expected to alleviate memory contention effects for
3958 // subclass fields and/or adjacent object.
3959 // If this was the default group, the padding is already in place.
3960 if (current_group != 0) {
3961 next_static_padded_offset += pad_size;
3962 }
3964 }
3966 } // handle contended
3968 // Size of instances
3969 int instance_size;
3971 int notaligned_offset = next_nonstatic_padded_offset;
3973 // Entire class is contended, pad in the back.
3974 // This helps to alleviate memory contention effects for subclass fields
3975 // and/or adjacent object.
3976 if (parsed_annotations.is_contended()) {
3977 notaligned_offset += pad_size;
3978 next_static_padded_offset += pad_size;
3979 }
3981 int next_static_type_offset = align_size_up(next_static_padded_offset, wordSize);
3982 int static_field_size = (next_static_type_offset -
3983 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3985 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3986 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3987 - first_nonstatic_field_offset)/heapOopSize);
3989 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3990 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3992 assert(instance_size == align_object_size(align_size_up(
3993 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations.is_contended()) ? pad_size : 0)),
3994 wordSize) / wordSize), "consistent layout helper value");
3996 // Number of non-static oop map blocks allocated at end of klass.
3997 const unsigned int total_oop_map_count =
3998 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3999 first_nonstatic_oop_offset);
4001 // Compute reference type
4002 ReferenceType rt;
4003 if (super_klass() == NULL) {
4004 rt = REF_NONE;
4005 } else {
4006 rt = super_klass->reference_type();
4007 }
4009 // We can now create the basic Klass* for this klass
4010 int total_oop_map_size2 =
4011 InstanceKlass::nonstatic_oop_map_size(total_oop_map_count);
4013 Klass* ik = InstanceKlass::allocate_instance_klass(loader_data,
4014 vtable_size,
4015 itable_size,
4016 static_field_size,
4017 total_oop_map_size2,
4018 rt,
4019 access_flags,
4020 name,
4021 super_klass(),
4022 host_klass,
4023 CHECK_(nullHandle));
4025 // Add all classes to our internal class loader list here,
4026 // including classes in the bootstrap (NULL) class loader.
4027 loader_data->add_class(ik);
4029 instanceKlassHandle this_klass (THREAD, ik);
4031 assert(this_klass->static_field_size() == static_field_size, "sanity");
4032 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
4033 "sanity");
4035 // Fill in information already parsed
4036 this_klass->set_should_verify_class(verify);
4037 jint lh = Klass::instance_layout_helper(instance_size, false);
4038 this_klass->set_layout_helper(lh);
4039 assert(this_klass->oop_is_instance(), "layout is correct");
4040 assert(this_klass->size_helper() == instance_size, "correct size_helper");
4041 // Not yet: supers are done below to support the new subtype-checking fields
4042 //this_klass->set_super(super_klass());
4043 this_klass->set_class_loader_data(loader_data);
4044 this_klass->set_nonstatic_field_size(nonstatic_field_size);
4045 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
4046 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4047 cp->set_pool_holder(this_klass());
4048 error_handler.set_in_error(false); // turn off error handler for cp
4049 this_klass->set_constants(cp());
4050 this_klass->set_local_interfaces(local_interfaces);
4051 this_klass->set_fields(fields, java_fields_count);
4052 this_klass->set_methods(methods);
4053 if (has_final_method) {
4054 this_klass->set_has_final_method();
4055 }
4056 this_klass->set_method_ordering(method_ordering);
4057 // The InstanceKlass::_methods_jmethod_ids cache and the
4058 // InstanceKlass::_methods_cached_itable_indices cache are
4059 // both managed on the assumption that the initial cache
4060 // size is equal to the number of methods in the class. If
4061 // that changes, then InstanceKlass::idnum_can_increment()
4062 // has to be changed accordingly.
4063 this_klass->set_initial_method_idnum(methods->length());
4064 this_klass->set_name(cp->klass_name_at(this_class_index));
4065 if (is_anonymous()) // I am well known to myself
4066 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4068 // Allocate an annotation type if needed.
4069 if (fields_annotations != NULL ||
4070 methods_annotations != NULL ||
4071 methods_parameter_annotations != NULL ||
4072 methods_default_annotations != NULL ||
4073 fields_type_annotations != NULL ||
4074 methods_type_annotations != NULL) {
4075 Annotations* anno = Annotations::allocate(loader_data,
4076 fields_annotations, methods_annotations,
4077 methods_parameter_annotations,
4078 methods_default_annotations, CHECK_(nullHandle));
4079 this_klass->set_annotations(anno);
4080 } else {
4081 this_klass->set_annotations(NULL);
4082 }
4084 if (fields_type_annotations != NULL ||
4085 methods_type_annotations != NULL) {
4086 assert(this_klass->annotations() != NULL, "annotations should have been allocated");
4087 Annotations* anno = Annotations::allocate(loader_data,
4088 fields_type_annotations,
4089 methods_type_annotations,
4090 NULL,
4091 NULL, CHECK_(nullHandle));
4092 this_klass->annotations()->set_type_annotations(anno);
4093 }
4095 this_klass->set_minor_version(minor_version);
4096 this_klass->set_major_version(major_version);
4097 this_klass->set_has_default_methods(has_default_methods);
4099 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4100 // (We used to do this lazily, but now we query it in Rewriter,
4101 // which is eagerly done for every method, so we might as well do it now,
4102 // when everything is fresh in memory.)
4103 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4104 for (int j = 0; j < methods->length(); j++) {
4105 methods->at(j)->init_intrinsic_id();
4106 }
4107 }
4109 if (cached_class_file_bytes != NULL) {
4110 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4111 this_klass->set_cached_class_file(cached_class_file_bytes,
4112 cached_class_file_length);
4113 }
4115 // Fill in field values obtained by parse_classfile_attributes
4116 if (parsed_annotations.has_any_annotations())
4117 parsed_annotations.apply_to(this_klass);
4119 // Create annotations
4120 if (_annotations != NULL && this_klass->annotations() == NULL) {
4121 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4122 this_klass->set_annotations(anno);
4123 }
4124 apply_parsed_class_attributes(this_klass);
4126 // Create type annotations
4127 if (_type_annotations != NULL) {
4128 if (this_klass->annotations() == NULL) {
4129 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4130 this_klass->set_annotations(anno);
4131 }
4132 if (this_klass->annotations()->type_annotations() == NULL) {
4133 Annotations* anno = Annotations::allocate(loader_data, CHECK_NULL);
4134 this_klass->annotations()->set_type_annotations(anno);
4135 }
4136 this_klass->annotations()->type_annotations()->set_class_annotations(_type_annotations);
4137 }
4139 // Miranda methods
4140 if ((num_miranda_methods > 0) ||
4141 // if this class introduced new miranda methods or
4142 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4143 // super class exists and this class inherited miranda methods
4144 ) {
4145 this_klass->set_has_miranda_methods(); // then set a flag
4146 }
4148 this_klass->set_transitive_interfaces(transitive_interfaces);
4150 // Fill in information needed to compute superclasses.
4151 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4153 // Initialize itable offset tables
4154 klassItable::setup_itable_offset_table(this_klass);
4156 // Compute transitive closure of interfaces this class implements
4157 // Do final class setup
4158 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
4160 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4161 set_precomputed_flags(this_klass);
4163 // reinitialize modifiers, using the InnerClasses attribute
4164 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4165 this_klass->set_modifier_flags(computed_modifiers);
4167 // check if this class can access its super class
4168 check_super_class_access(this_klass, CHECK_(nullHandle));
4170 // check if this class can access its superinterfaces
4171 check_super_interface_access(this_klass, CHECK_(nullHandle));
4173 // check if this class overrides any final method
4174 check_final_method_override(this_klass, CHECK_(nullHandle));
4176 // check that if this class is an interface then it doesn't have static methods
4177 if (this_klass->is_interface()) {
4178 /* An interface in a JAVA 8 classfile can be static */
4179 if (_major_version < JAVA_8_VERSION) {
4180 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4181 }
4182 }
4185 #ifdef ASSERT
4186 if (ParseAllGenericSignatures) {
4187 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4188 }
4189 #endif
4191 // Generate any default methods - default methods are interface methods
4192 // that have a default implementation. This is new with Lambda project.
4193 if (has_default_methods && !access_flags.is_interface() &&
4194 local_interfaces->length() > 0) {
4195 DefaultMethods::generate_default_methods(
4196 this_klass(), &all_mirandas, CHECK_(nullHandle));
4197 }
4199 // Allocate mirror and initialize static fields
4200 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
4202 // Allocate a simple java object for locking during class initialization.
4203 // This needs to be a java object because it can be held across a java call.
4204 typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
4205 this_klass->set_init_lock(r);
4207 // TODO: Move these oops to the mirror
4208 this_klass->set_protection_domain(protection_domain());
4210 // Update the loader_data graph.
4211 record_defined_class_dependencies(this_klass, CHECK_NULL);
4213 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4214 false /* not shared class */);
4216 if (TraceClassLoading) {
4217 ResourceMark rm;
4218 // print in a single call to reduce interleaving of output
4219 if (cfs->source() != NULL) {
4220 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4221 cfs->source());
4222 } else if (class_loader.is_null()) {
4223 if (THREAD->is_Java_thread()) {
4224 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4225 tty->print("[Loaded %s by instance of %s]\n",
4226 this_klass->external_name(),
4227 InstanceKlass::cast(caller)->external_name());
4228 } else {
4229 tty->print("[Loaded %s]\n", this_klass->external_name());
4230 }
4231 } else {
4232 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4233 InstanceKlass::cast(class_loader->klass())->external_name());
4234 }
4235 }
4237 if (TraceClassResolution) {
4238 ResourceMark rm;
4239 // print out the superclass.
4240 const char * from = this_klass()->external_name();
4241 if (this_klass->java_super() != NULL) {
4242 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4243 }
4244 // print out each of the interface classes referred to by this class.
4245 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4246 if (local_interfaces != NULL) {
4247 int length = local_interfaces->length();
4248 for (int i = 0; i < length; i++) {
4249 Klass* k = local_interfaces->at(i);
4250 InstanceKlass* to_class = InstanceKlass::cast(k);
4251 const char * to = to_class->external_name();
4252 tty->print("RESOLVE %s %s (interface)\n", from, to);
4253 }
4254 }
4255 }
4257 #ifndef PRODUCT
4258 if( PrintCompactFieldsSavings ) {
4259 ResourceMark rm;
4260 if( nonstatic_field_size < orig_nonstatic_field_size ) {
4261 tty->print("[Saved %d of %d bytes in %s]\n",
4262 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
4263 orig_nonstatic_field_size*heapOopSize,
4264 this_klass->external_name());
4265 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
4266 tty->print("[Wasted %d over %d bytes in %s]\n",
4267 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
4268 orig_nonstatic_field_size*heapOopSize,
4269 this_klass->external_name());
4270 }
4271 }
4272 #endif
4274 #ifndef PRODUCT
4275 if (PrintFieldLayout) {
4276 print_field_layout(name,
4277 fields,
4278 cp,
4279 instance_size,
4280 first_nonstatic_field_offset,
4281 next_nonstatic_field_offset,
4282 next_static_type_offset);
4283 }
4284 #endif
4286 // preserve result across HandleMark
4287 preserve_this_klass = this_klass();
4288 }
4290 // Create new handle outside HandleMark (might be needed for
4291 // Extended Class Redefinition)
4292 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4293 debug_only(this_klass->verify();)
4295 return this_klass;
4296 }
4298 void ClassFileParser::print_field_layout(Symbol* name,
4299 Array<u2>* fields,
4300 constantPoolHandle cp,
4301 int instance_size,
4302 int instance_fields_start,
4303 int instance_fields_end,
4304 int static_fields_end) {
4305 tty->print("%s: field layout\n", name->as_klass_external_name());
4306 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4307 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4308 if (!fs.access_flags().is_static()) {
4309 tty->print(" @%3d \"%s\" %s\n",
4310 fs.offset(),
4311 fs.name()->as_klass_external_name(),
4312 fs.signature()->as_klass_external_name());
4313 }
4314 }
4315 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4316 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4317 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4318 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4319 if (fs.access_flags().is_static()) {
4320 tty->print(" @%3d \"%s\" %s\n",
4321 fs.offset(),
4322 fs.name()->as_klass_external_name(),
4323 fs.signature()->as_klass_external_name());
4324 }
4325 }
4326 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4327 tty->print("\n");
4328 }
4330 unsigned int
4331 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4332 unsigned int nonstatic_oop_map_count,
4333 int first_nonstatic_oop_offset) {
4334 unsigned int map_count =
4335 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4336 if (nonstatic_oop_map_count > 0) {
4337 // We have oops to add to map
4338 if (map_count == 0) {
4339 map_count = nonstatic_oop_map_count;
4340 } else {
4341 // Check whether we should add a new map block or whether the last one can
4342 // be extended
4343 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4344 OopMapBlock* const last_map = first_map + map_count - 1;
4346 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4347 if (next_offset == first_nonstatic_oop_offset) {
4348 // There is no gap bettwen superklass's last oop field and first
4349 // local oop field, merge maps.
4350 nonstatic_oop_map_count -= 1;
4351 } else {
4352 // Superklass didn't end with a oop field, add extra maps
4353 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4354 }
4355 map_count += nonstatic_oop_map_count;
4356 }
4357 }
4358 return map_count;
4359 }
4362 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4363 unsigned int nonstatic_oop_map_count,
4364 int* nonstatic_oop_offsets,
4365 unsigned int* nonstatic_oop_counts) {
4366 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4367 const InstanceKlass* const super = k->superklass();
4368 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4369 if (super_count > 0) {
4370 // Copy maps from superklass
4371 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4372 for (unsigned int i = 0; i < super_count; ++i) {
4373 *this_oop_map++ = *super_oop_map++;
4374 }
4375 }
4377 if (nonstatic_oop_map_count > 0) {
4378 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4379 // The counts differ because there is no gap between superklass's last oop
4380 // field and the first local oop field. Extend the last oop map copied
4381 // from the superklass instead of creating new one.
4382 nonstatic_oop_map_count--;
4383 nonstatic_oop_offsets++;
4384 this_oop_map--;
4385 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4386 this_oop_map++;
4387 }
4389 // Add new map blocks, fill them
4390 while (nonstatic_oop_map_count-- > 0) {
4391 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4392 this_oop_map->set_count(*nonstatic_oop_counts++);
4393 this_oop_map++;
4394 }
4395 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4396 this_oop_map, "sanity");
4397 }
4398 }
4401 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4402 Klass* super = k->super();
4404 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4405 // in which case we don't have to register objects as finalizable
4406 if (!_has_empty_finalizer) {
4407 if (_has_finalizer ||
4408 (super != NULL && super->has_finalizer())) {
4409 k->set_has_finalizer();
4410 }
4411 }
4413 #ifdef ASSERT
4414 bool f = false;
4415 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4416 vmSymbols::void_method_signature());
4417 if (m != NULL && !m->is_empty_method()) {
4418 f = true;
4419 }
4420 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4421 #endif
4423 // Check if this klass supports the java.lang.Cloneable interface
4424 if (SystemDictionary::Cloneable_klass_loaded()) {
4425 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4426 k->set_is_cloneable();
4427 }
4428 }
4430 // Check if this klass has a vanilla default constructor
4431 if (super == NULL) {
4432 // java.lang.Object has empty default constructor
4433 k->set_has_vanilla_constructor();
4434 } else {
4435 if (super->has_vanilla_constructor() &&
4436 _has_vanilla_constructor) {
4437 k->set_has_vanilla_constructor();
4438 }
4439 #ifdef ASSERT
4440 bool v = false;
4441 if (super->has_vanilla_constructor()) {
4442 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4443 ), vmSymbols::void_method_signature());
4444 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4445 v = true;
4446 }
4447 }
4448 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4449 #endif
4450 }
4452 // If it cannot be fast-path allocated, set a bit in the layout helper.
4453 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4454 assert(k->size_helper() > 0, "layout_helper is initialized");
4455 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4456 || k->is_abstract() || k->is_interface()
4457 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4458 || k->size_helper() >= FastAllocateSizeLimit) {
4459 // Forbid fast-path allocation.
4460 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4461 k->set_layout_helper(lh);
4462 }
4463 }
4465 // Attach super classes and interface classes to class loader data
4466 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4467 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4468 if (defining_loader_data->is_the_null_class_loader_data()) {
4469 // Dependencies to null class loader data are implicit.
4470 return;
4471 } else {
4472 // add super class dependency
4473 Klass* super = defined_klass->super();
4474 if (super != NULL) {
4475 defining_loader_data->record_dependency(super, CHECK);
4476 }
4478 // add super interface dependencies
4479 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4480 if (local_interfaces != NULL) {
4481 int length = local_interfaces->length();
4482 for (int i = 0; i < length; i++) {
4483 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4484 }
4485 }
4486 }
4487 }
4489 // utility method for appending and array with check for duplicates
4491 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4492 // iterate over new interfaces
4493 for (int i = 0; i < ifs->length(); i++) {
4494 Klass* e = ifs->at(i);
4495 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4496 // add new interface
4497 result->append_if_missing(e);
4498 }
4499 }
4502 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(ClassLoaderData* loader_data, instanceKlassHandle super, Array<Klass*>* local_ifs, TRAPS) {
4503 // Compute maximum size for transitive interfaces
4504 int max_transitive_size = 0;
4505 int super_size = 0;
4506 // Add superclass transitive interfaces size
4507 if (super.not_null()) {
4508 super_size = super->transitive_interfaces()->length();
4509 max_transitive_size += super_size;
4510 }
4511 // Add local interfaces' super interfaces
4512 int local_size = local_ifs->length();
4513 for (int i = 0; i < local_size; i++) {
4514 Klass* l = local_ifs->at(i);
4515 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4516 }
4517 // Finally add local interfaces
4518 max_transitive_size += local_size;
4519 // Construct array
4520 if (max_transitive_size == 0) {
4521 // no interfaces, use canonicalized array
4522 return Universe::the_empty_klass_array();
4523 } else if (max_transitive_size == super_size) {
4524 // no new local interfaces added, share superklass' transitive interface array
4525 return super->transitive_interfaces();
4526 } else if (max_transitive_size == local_size) {
4527 // only local interfaces added, share local interface array
4528 return local_ifs;
4529 } else {
4530 ResourceMark rm;
4531 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4533 // Copy down from superclass
4534 if (super.not_null()) {
4535 append_interfaces(result, super->transitive_interfaces());
4536 }
4538 // Copy down from local interfaces' superinterfaces
4539 for (int i = 0; i < local_ifs->length(); i++) {
4540 Klass* l = local_ifs->at(i);
4541 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4542 }
4543 // Finally add local interfaces
4544 append_interfaces(result, local_ifs);
4546 // length will be less than the max_transitive_size if duplicates were removed
4547 int length = result->length();
4548 assert(length <= max_transitive_size, "just checking");
4549 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4550 for (int i = 0; i < length; i++) {
4551 Klass* e = result->at(i);
4552 assert(e != NULL, "just checking");
4553 new_result->at_put(i, e);
4554 }
4555 return new_result;
4556 }
4557 }
4560 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4561 Klass* super = this_klass->super();
4562 if ((super != NULL) &&
4563 (!Reflection::verify_class_access(this_klass(), super, false))) {
4564 ResourceMark rm(THREAD);
4565 Exceptions::fthrow(
4566 THREAD_AND_LOCATION,
4567 vmSymbols::java_lang_IllegalAccessError(),
4568 "class %s cannot access its superclass %s",
4569 this_klass->external_name(),
4570 InstanceKlass::cast(super)->external_name()
4571 );
4572 return;
4573 }
4574 }
4577 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4578 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4579 int lng = local_interfaces->length();
4580 for (int i = lng - 1; i >= 0; i--) {
4581 Klass* k = local_interfaces->at(i);
4582 assert (k != NULL && k->is_interface(), "invalid interface");
4583 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4584 ResourceMark rm(THREAD);
4585 Exceptions::fthrow(
4586 THREAD_AND_LOCATION,
4587 vmSymbols::java_lang_IllegalAccessError(),
4588 "class %s cannot access its superinterface %s",
4589 this_klass->external_name(),
4590 InstanceKlass::cast(k)->external_name()
4591 );
4592 return;
4593 }
4594 }
4595 }
4598 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4599 Array<Method*>* methods = this_klass->methods();
4600 int num_methods = methods->length();
4602 // go thru each method and check if it overrides a final method
4603 for (int index = 0; index < num_methods; index++) {
4604 Method* m = methods->at(index);
4606 // skip private, static and <init> methods
4607 if ((!m->is_private()) &&
4608 (!m->is_static()) &&
4609 (m->name() != vmSymbols::object_initializer_name())) {
4611 Symbol* name = m->name();
4612 Symbol* signature = m->signature();
4613 Klass* k = this_klass->super();
4614 Method* super_m = NULL;
4615 while (k != NULL) {
4616 // skip supers that don't have final methods.
4617 if (k->has_final_method()) {
4618 // lookup a matching method in the super class hierarchy
4619 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4620 if (super_m == NULL) {
4621 break; // didn't find any match; get out
4622 }
4624 if (super_m->is_final() &&
4625 // matching method in super is final
4626 (Reflection::verify_field_access(this_klass(),
4627 super_m->method_holder(),
4628 super_m->method_holder(),
4629 super_m->access_flags(), false))
4630 // this class can access super final method and therefore override
4631 ) {
4632 ResourceMark rm(THREAD);
4633 Exceptions::fthrow(
4634 THREAD_AND_LOCATION,
4635 vmSymbols::java_lang_VerifyError(),
4636 "class %s overrides final method %s.%s",
4637 this_klass->external_name(),
4638 name->as_C_string(),
4639 signature->as_C_string()
4640 );
4641 return;
4642 }
4644 // continue to look from super_m's holder's super.
4645 k = super_m->method_holder()->super();
4646 continue;
4647 }
4649 k = k->super();
4650 }
4651 }
4652 }
4653 }
4656 // assumes that this_klass is an interface
4657 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4658 assert(this_klass->is_interface(), "not an interface");
4659 Array<Method*>* methods = this_klass->methods();
4660 int num_methods = methods->length();
4662 for (int index = 0; index < num_methods; index++) {
4663 Method* m = methods->at(index);
4664 // if m is static and not the init method, throw a verify error
4665 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4666 ResourceMark rm(THREAD);
4667 Exceptions::fthrow(
4668 THREAD_AND_LOCATION,
4669 vmSymbols::java_lang_VerifyError(),
4670 "Illegal static method %s in interface %s",
4671 m->name()->as_C_string(),
4672 this_klass->external_name()
4673 );
4674 return;
4675 }
4676 }
4677 }
4679 // utility methods for format checking
4681 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4682 if (!_need_verify) { return; }
4684 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4685 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4686 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4687 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4688 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4689 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4690 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4692 if ((is_abstract && is_final) ||
4693 (is_interface && !is_abstract) ||
4694 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4695 (!is_interface && major_gte_15 && is_annotation)) {
4696 ResourceMark rm(THREAD);
4697 Exceptions::fthrow(
4698 THREAD_AND_LOCATION,
4699 vmSymbols::java_lang_ClassFormatError(),
4700 "Illegal class modifiers in class %s: 0x%X",
4701 _class_name->as_C_string(), flags
4702 );
4703 return;
4704 }
4705 }
4707 bool ClassFileParser::has_illegal_visibility(jint flags) {
4708 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4709 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4710 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4712 return ((is_public && is_protected) ||
4713 (is_public && is_private) ||
4714 (is_protected && is_private));
4715 }
4717 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4718 u2 max_version =
4719 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4720 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4721 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4722 (major <= max_version) &&
4723 ((major != max_version) ||
4724 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4725 }
4727 void ClassFileParser::verify_legal_field_modifiers(
4728 jint flags, bool is_interface, TRAPS) {
4729 if (!_need_verify) { return; }
4731 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4732 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4733 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4734 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4735 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4736 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4737 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4738 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4739 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4741 bool is_illegal = false;
4743 if (is_interface) {
4744 if (!is_public || !is_static || !is_final || is_private ||
4745 is_protected || is_volatile || is_transient ||
4746 (major_gte_15 && is_enum)) {
4747 is_illegal = true;
4748 }
4749 } else { // not interface
4750 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4751 is_illegal = true;
4752 }
4753 }
4755 if (is_illegal) {
4756 ResourceMark rm(THREAD);
4757 Exceptions::fthrow(
4758 THREAD_AND_LOCATION,
4759 vmSymbols::java_lang_ClassFormatError(),
4760 "Illegal field modifiers in class %s: 0x%X",
4761 _class_name->as_C_string(), flags);
4762 return;
4763 }
4764 }
4766 void ClassFileParser::verify_legal_method_modifiers(
4767 jint flags, bool is_interface, Symbol* name, TRAPS) {
4768 if (!_need_verify) { return; }
4770 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4771 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4772 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4773 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4774 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4775 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4776 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4777 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4778 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4779 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4780 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4781 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4782 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4784 bool is_illegal = false;
4786 if (is_interface) {
4787 if (major_gte_8) {
4788 // Class file version is JAVA_8_VERSION or later Methods of
4789 // interfaces may set any of the flags except ACC_PROTECTED,
4790 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4791 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4792 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4793 (is_native || is_protected || is_final || is_synchronized) ||
4794 // If a specific method of a class or interface has its
4795 // ACC_ABSTRACT flag set, it must not have any of its
4796 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4797 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4798 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4799 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4800 (is_abstract && (is_private || is_static || is_strict))) {
4801 is_illegal = true;
4802 }
4803 } else if (major_gte_15) {
4804 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4805 if (!is_public || is_static || is_final || is_synchronized ||
4806 is_native || !is_abstract || is_strict) {
4807 is_illegal = true;
4808 }
4809 } else {
4810 // Class file version is pre-JAVA_1_5_VERSION
4811 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4812 is_illegal = true;
4813 }
4814 }
4815 } else { // not interface
4816 if (is_initializer) {
4817 if (is_static || is_final || is_synchronized || is_native ||
4818 is_abstract || (major_gte_15 && is_bridge)) {
4819 is_illegal = true;
4820 }
4821 } else { // not initializer
4822 if (is_abstract) {
4823 if ((is_final || is_native || is_private || is_static ||
4824 (major_gte_15 && (is_synchronized || is_strict)))) {
4825 is_illegal = true;
4826 }
4827 }
4828 if (has_illegal_visibility(flags)) {
4829 is_illegal = true;
4830 }
4831 }
4832 }
4834 if (is_illegal) {
4835 ResourceMark rm(THREAD);
4836 Exceptions::fthrow(
4837 THREAD_AND_LOCATION,
4838 vmSymbols::java_lang_ClassFormatError(),
4839 "Method %s in class %s has illegal modifiers: 0x%X",
4840 name->as_C_string(), _class_name->as_C_string(), flags);
4841 return;
4842 }
4843 }
4845 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4846 assert(_need_verify, "only called when _need_verify is true");
4847 int i = 0;
4848 int count = length >> 2;
4849 for (int k=0; k<count; k++) {
4850 unsigned char b0 = buffer[i];
4851 unsigned char b1 = buffer[i+1];
4852 unsigned char b2 = buffer[i+2];
4853 unsigned char b3 = buffer[i+3];
4854 // For an unsigned char v,
4855 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4856 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4857 unsigned char res = b0 | b0 - 1 |
4858 b1 | b1 - 1 |
4859 b2 | b2 - 1 |
4860 b3 | b3 - 1;
4861 if (res >= 128) break;
4862 i += 4;
4863 }
4864 for(; i < length; i++) {
4865 unsigned short c;
4866 // no embedded zeros
4867 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4868 if(buffer[i] < 128) {
4869 continue;
4870 }
4871 if ((i + 5) < length) { // see if it's legal supplementary character
4872 if (UTF8::is_supplementary_character(&buffer[i])) {
4873 c = UTF8::get_supplementary_character(&buffer[i]);
4874 i += 5;
4875 continue;
4876 }
4877 }
4878 switch (buffer[i] >> 4) {
4879 default: break;
4880 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4881 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4882 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4883 c = (buffer[i] & 0x1F) << 6;
4884 i++;
4885 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4886 c += buffer[i] & 0x3F;
4887 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4888 // for classes with major > 47, c must a null or a character in its shortest form
4889 break;
4890 }
4891 }
4892 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4893 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4894 c = (buffer[i] & 0xF) << 12;
4895 i += 2;
4896 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4897 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4898 if (_major_version <= 47 || c >= 0x800) {
4899 // for classes with major > 47, c must be in its shortest form
4900 break;
4901 }
4902 }
4903 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4904 } // end of switch
4905 } // end of for
4906 }
4908 // Checks if name is a legal class name.
4909 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4910 if (!_need_verify || _relax_verify) { return; }
4912 char buf[fixed_buffer_size];
4913 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4914 unsigned int length = name->utf8_length();
4915 bool legal = false;
4917 if (length > 0) {
4918 char* p;
4919 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4920 p = skip_over_field_signature(bytes, false, length, CHECK);
4921 legal = (p != NULL) && ((p - bytes) == (int)length);
4922 } else if (_major_version < JAVA_1_5_VERSION) {
4923 if (bytes[0] != '<') {
4924 p = skip_over_field_name(bytes, true, length);
4925 legal = (p != NULL) && ((p - bytes) == (int)length);
4926 }
4927 } else {
4928 // 4900761: relax the constraints based on JSR202 spec
4929 // Class names may be drawn from the entire Unicode character set.
4930 // Identifiers between '/' must be unqualified names.
4931 // The utf8 string has been verified when parsing cpool entries.
4932 legal = verify_unqualified_name(bytes, length, LegalClass);
4933 }
4934 }
4935 if (!legal) {
4936 ResourceMark rm(THREAD);
4937 Exceptions::fthrow(
4938 THREAD_AND_LOCATION,
4939 vmSymbols::java_lang_ClassFormatError(),
4940 "Illegal class name \"%s\" in class file %s", bytes,
4941 _class_name->as_C_string()
4942 );
4943 return;
4944 }
4945 }
4947 // Checks if name is a legal field name.
4948 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4949 if (!_need_verify || _relax_verify) { return; }
4951 char buf[fixed_buffer_size];
4952 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4953 unsigned int length = name->utf8_length();
4954 bool legal = false;
4956 if (length > 0) {
4957 if (_major_version < JAVA_1_5_VERSION) {
4958 if (bytes[0] != '<') {
4959 char* p = skip_over_field_name(bytes, false, length);
4960 legal = (p != NULL) && ((p - bytes) == (int)length);
4961 }
4962 } else {
4963 // 4881221: relax the constraints based on JSR202 spec
4964 legal = verify_unqualified_name(bytes, length, LegalField);
4965 }
4966 }
4968 if (!legal) {
4969 ResourceMark rm(THREAD);
4970 Exceptions::fthrow(
4971 THREAD_AND_LOCATION,
4972 vmSymbols::java_lang_ClassFormatError(),
4973 "Illegal field name \"%s\" in class %s", bytes,
4974 _class_name->as_C_string()
4975 );
4976 return;
4977 }
4978 }
4980 // Checks if name is a legal method name.
4981 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4982 if (!_need_verify || _relax_verify) { return; }
4984 assert(name != NULL, "method name is null");
4985 char buf[fixed_buffer_size];
4986 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4987 unsigned int length = name->utf8_length();
4988 bool legal = false;
4990 if (length > 0) {
4991 if (bytes[0] == '<') {
4992 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4993 legal = true;
4994 }
4995 } else if (_major_version < JAVA_1_5_VERSION) {
4996 char* p;
4997 p = skip_over_field_name(bytes, false, length);
4998 legal = (p != NULL) && ((p - bytes) == (int)length);
4999 } else {
5000 // 4881221: relax the constraints based on JSR202 spec
5001 legal = verify_unqualified_name(bytes, length, LegalMethod);
5002 }
5003 }
5005 if (!legal) {
5006 ResourceMark rm(THREAD);
5007 Exceptions::fthrow(
5008 THREAD_AND_LOCATION,
5009 vmSymbols::java_lang_ClassFormatError(),
5010 "Illegal method name \"%s\" in class %s", bytes,
5011 _class_name->as_C_string()
5012 );
5013 return;
5014 }
5015 }
5018 // Checks if signature is a legal field signature.
5019 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5020 if (!_need_verify) { return; }
5022 char buf[fixed_buffer_size];
5023 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5024 unsigned int length = signature->utf8_length();
5025 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5027 if (p == NULL || (p - bytes) != (int)length) {
5028 throwIllegalSignature("Field", name, signature, CHECK);
5029 }
5030 }
5032 // Checks if signature is a legal method signature.
5033 // Returns number of parameters
5034 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5035 if (!_need_verify) {
5036 // make sure caller's args_size will be less than 0 even for non-static
5037 // method so it will be recomputed in compute_size_of_parameters().
5038 return -2;
5039 }
5041 unsigned int args_size = 0;
5042 char buf[fixed_buffer_size];
5043 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5044 unsigned int length = signature->utf8_length();
5045 char* nextp;
5047 // The first character must be a '('
5048 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5049 length--;
5050 // Skip over legal field signatures
5051 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5052 while ((length > 0) && (nextp != NULL)) {
5053 args_size++;
5054 if (p[0] == 'J' || p[0] == 'D') {
5055 args_size++;
5056 }
5057 length -= nextp - p;
5058 p = nextp;
5059 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5060 }
5061 // The first non-signature thing better be a ')'
5062 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5063 length--;
5064 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5065 // All internal methods must return void
5066 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5067 return args_size;
5068 }
5069 } else {
5070 // Now we better just have a return value
5071 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5072 if (nextp && ((int)length == (nextp - p))) {
5073 return args_size;
5074 }
5075 }
5076 }
5077 }
5078 // Report error
5079 throwIllegalSignature("Method", name, signature, CHECK_0);
5080 return 0;
5081 }
5084 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5085 // Method names also may not contain the characters '<' or '>', unless <init>
5086 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5087 // method. Because these names have been checked as special cases before
5088 // calling this method in verify_legal_method_name.
5089 bool ClassFileParser::verify_unqualified_name(
5090 char* name, unsigned int length, int type) {
5091 jchar ch;
5093 for (char* p = name; p != name + length; ) {
5094 ch = *p;
5095 if (ch < 128) {
5096 p++;
5097 if (ch == '.' || ch == ';' || ch == '[' ) {
5098 return false; // do not permit '.', ';', or '['
5099 }
5100 if (type != LegalClass && ch == '/') {
5101 return false; // do not permit '/' unless it's class name
5102 }
5103 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5104 return false; // do not permit '<' or '>' in method names
5105 }
5106 } else {
5107 char* tmp_p = UTF8::next(p, &ch);
5108 p = tmp_p;
5109 }
5110 }
5111 return true;
5112 }
5115 // Take pointer to a string. Skip over the longest part of the string that could
5116 // be taken as a fieldname. Allow '/' if slash_ok is true.
5117 // Return a pointer to just past the fieldname.
5118 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5119 // being true, we saw consecutive slashes (meaning we were looking for a
5120 // qualified path but found something that was badly-formed).
5121 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5122 char* p;
5123 jchar ch;
5124 jboolean last_is_slash = false;
5125 jboolean not_first_ch = false;
5127 for (p = name; p != name + length; not_first_ch = true) {
5128 char* old_p = p;
5129 ch = *p;
5130 if (ch < 128) {
5131 p++;
5132 // quick check for ascii
5133 if ((ch >= 'a' && ch <= 'z') ||
5134 (ch >= 'A' && ch <= 'Z') ||
5135 (ch == '_' || ch == '$') ||
5136 (not_first_ch && ch >= '0' && ch <= '9')) {
5137 last_is_slash = false;
5138 continue;
5139 }
5140 if (slash_ok && ch == '/') {
5141 if (last_is_slash) {
5142 return NULL; // Don't permit consecutive slashes
5143 }
5144 last_is_slash = true;
5145 continue;
5146 }
5147 } else {
5148 jint unicode_ch;
5149 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5150 p = tmp_p;
5151 last_is_slash = false;
5152 // Check if ch is Java identifier start or is Java identifier part
5153 // 4672820: call java.lang.Character methods directly without generating separate tables.
5154 EXCEPTION_MARK;
5155 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5157 // return value
5158 JavaValue result(T_BOOLEAN);
5159 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5160 JavaCallArguments args;
5161 args.push_int(unicode_ch);
5163 // public static boolean isJavaIdentifierStart(char ch);
5164 JavaCalls::call_static(&result,
5165 klass,
5166 vmSymbols::isJavaIdentifierStart_name(),
5167 vmSymbols::int_bool_signature(),
5168 &args,
5169 THREAD);
5171 if (HAS_PENDING_EXCEPTION) {
5172 CLEAR_PENDING_EXCEPTION;
5173 return 0;
5174 }
5175 if (result.get_jboolean()) {
5176 continue;
5177 }
5179 if (not_first_ch) {
5180 // public static boolean isJavaIdentifierPart(char ch);
5181 JavaCalls::call_static(&result,
5182 klass,
5183 vmSymbols::isJavaIdentifierPart_name(),
5184 vmSymbols::int_bool_signature(),
5185 &args,
5186 THREAD);
5188 if (HAS_PENDING_EXCEPTION) {
5189 CLEAR_PENDING_EXCEPTION;
5190 return 0;
5191 }
5193 if (result.get_jboolean()) {
5194 continue;
5195 }
5196 }
5197 }
5198 return (not_first_ch) ? old_p : NULL;
5199 }
5200 return (not_first_ch) ? p : NULL;
5201 }
5204 // Take pointer to a string. Skip over the longest part of the string that could
5205 // be taken as a field signature. Allow "void" if void_ok.
5206 // Return a pointer to just past the signature.
5207 // Return NULL if no legal signature is found.
5208 char* ClassFileParser::skip_over_field_signature(char* signature,
5209 bool void_ok,
5210 unsigned int length,
5211 TRAPS) {
5212 unsigned int array_dim = 0;
5213 while (length > 0) {
5214 switch (signature[0]) {
5215 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5216 case JVM_SIGNATURE_BOOLEAN:
5217 case JVM_SIGNATURE_BYTE:
5218 case JVM_SIGNATURE_CHAR:
5219 case JVM_SIGNATURE_SHORT:
5220 case JVM_SIGNATURE_INT:
5221 case JVM_SIGNATURE_FLOAT:
5222 case JVM_SIGNATURE_LONG:
5223 case JVM_SIGNATURE_DOUBLE:
5224 return signature + 1;
5225 case JVM_SIGNATURE_CLASS: {
5226 if (_major_version < JAVA_1_5_VERSION) {
5227 // Skip over the class name if one is there
5228 char* p = skip_over_field_name(signature + 1, true, --length);
5230 // The next character better be a semicolon
5231 if (p && (p - signature) > 1 && p[0] == ';') {
5232 return p + 1;
5233 }
5234 } else {
5235 // 4900761: For class version > 48, any unicode is allowed in class name.
5236 length--;
5237 signature++;
5238 while (length > 0 && signature[0] != ';') {
5239 if (signature[0] == '.') {
5240 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5241 }
5242 length--;
5243 signature++;
5244 }
5245 if (signature[0] == ';') { return signature + 1; }
5246 }
5248 return NULL;
5249 }
5250 case JVM_SIGNATURE_ARRAY:
5251 array_dim++;
5252 if (array_dim > 255) {
5253 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5254 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5255 }
5256 // The rest of what's there better be a legal signature
5257 signature++;
5258 length--;
5259 void_ok = false;
5260 break;
5262 default:
5263 return NULL;
5264 }
5265 }
5266 return NULL;
5267 }