1 /*
2 * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "jimage.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/classListParser.hpp"
30 #include "cds/lambdaFormInvokers.hpp"
31 #include "cds/metaspaceShared.hpp"
32 #include "cds/unregisteredClasses.hpp"
33 #include "classfile/classLoaderExt.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "classfile/vmClasses.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/linkResolver.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/constantPool.hpp"
47 #include "runtime/atomic.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/hashtable.inline.hpp"
53 #include "utilities/macros.hpp"
54
55 volatile Thread* ClassListParser::_parsing_thread = NULL;
56 ClassListParser* ClassListParser::_instance = NULL;
57
58 ClassListParser::ClassListParser(const char* file) : _id2klass_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE) {
59 _classlist_file = file;
60 _file = NULL;
61 // Use os::open() because neither fopen() nor os::fopen()
62 // can handle long path name on Windows.
63 int fd = os::open(file, O_RDONLY, S_IREAD);
64 if (fd != -1) {
65 // Obtain a File* from the file descriptor so that fgets()
66 // can be used in parse_one_line()
67 _file = os::open(fd, "r");
68 }
69 if (_file == NULL) {
70 char errmsg[JVM_MAXPATHLEN];
71 os::lasterror(errmsg, JVM_MAXPATHLEN);
72 vm_exit_during_initialization("Loading classlist failed", errmsg);
73 }
74 _line_no = 0;
75 _interfaces = new (ResourceObj::C_HEAP, mtClass) GrowableArray<int>(10, mtClass);
76 _indy_items = new (ResourceObj::C_HEAP, mtClass) GrowableArray<const char*>(9, mtClass);
77
78 // _instance should only be accessed by the thread that created _instance.
79 assert(_instance == NULL, "must be singleton");
80 _instance = this;
81 Atomic::store(&_parsing_thread, Thread::current());
82 }
83
84 bool ClassListParser::is_parsing_thread() {
85 return Atomic::load(&_parsing_thread) == Thread::current();
86 }
87
88 ClassListParser::~ClassListParser() {
89 if (_file != NULL) {
90 fclose(_file);
91 }
92 Atomic::store(&_parsing_thread, (Thread*)NULL);
93 delete _indy_items;
94 delete _interfaces;
95 _instance = NULL;
96 }
97
98 int ClassListParser::parse(TRAPS) {
99 int class_count = 0;
100
101 while (parse_one_line()) {
102 if (lambda_form_line()) {
103 // The current line is "@lambda-form-invoker ...". It has been recorded in LambdaFormInvokers,
104 // and will be processed later.
105 continue;
106 }
107
108 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(_class_name);
109 if (_indy_items->length() > 0) {
110 // The current line is "@lambda-proxy class_name". Load the proxy class.
111 resolve_indy(THREAD, class_name_symbol);
112 class_count++;
113 continue;
114 }
115
116 Klass* klass = load_current_class(class_name_symbol, THREAD);
117 if (HAS_PENDING_EXCEPTION) {
118 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
119 // If we have run out of memory, don't try to load the rest of the classes in
120 // the classlist. Throw an exception, which will terminate the dumping process.
121 return 0; // THROW
122 }
123
124 ResourceMark rm(THREAD);
125 char* ex_msg = (char*)"";
126 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
127 if (message != NULL) {
128 ex_msg = java_lang_String::as_utf8_string(message);
129 }
130 log_warning(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(), ex_msg);
131 // We might have an invalid class name or an bad class. Warn about it
132 // and keep going to the next line.
133 CLEAR_PENDING_EXCEPTION;
134 log_warning(cds)("Preload Warning: Cannot find %s", _class_name);
135 continue;
136 }
137
138 assert(klass != NULL, "sanity");
139 if (log_is_enabled(Trace, cds)) {
140 ResourceMark rm(THREAD);
141 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
142 }
143
144 if (klass->is_instance_klass()) {
145 InstanceKlass* ik = InstanceKlass::cast(klass);
146
147 // Link the class to cause the bytecodes to be rewritten and the
148 // cpcache to be created. The linking is done as soon as classes
149 // are loaded in order that the related data structures (klass and
150 // cpCache) are located together.
151 MetaspaceShared::try_link_class(THREAD, ik);
152 }
153
154 class_count++;
155 }
156
157 return class_count;
158 }
159
160 bool ClassListParser::parse_one_line() {
161 for (;;) {
162 if (fgets(_line, sizeof(_line), _file) == NULL) {
163 return false;
164 }
165 ++ _line_no;
166 _line_len = (int)strlen(_line);
167 if (_line_len > _max_allowed_line_len) {
168 error("input line too long (must be no longer than %d chars)", _max_allowed_line_len);
169 }
170 if (*_line == '#') { // comment
171 continue;
172 }
173
174 {
175 int len = (int)strlen(_line);
176 int i;
177 // Replace \t\r\n\f with ' '
178 for (i=0; i<len; i++) {
179 if (_line[i] == '\t' || _line[i] == '\r' || _line[i] == '\n' || _line[i] == '\f') {
180 _line[i] = ' ';
181 }
182 }
183
184 // Remove trailing newline/space
185 while (len > 0) {
186 if (_line[len-1] == ' ') {
187 _line[len-1] = '\0';
188 len --;
189 } else {
190 break;
191 }
192 }
193 _line_len = len;
194 }
195
196 // valid line
197 break;
198 }
199
200 _class_name = _line;
201 _id = _unspecified;
202 _super = _unspecified;
203 _interfaces->clear();
204 _source = NULL;
205 _interfaces_specified = false;
206 _indy_items->clear();
207 _lambda_form_line = false;
208
209 if (_line[0] == '@') {
210 return parse_at_tags();
211 }
212
213 if ((_token = strchr(_line, ' ')) == NULL) {
214 // No optional arguments are specified.
215 return true;
216 }
217
218 // Mark the end of the name, and go to the next input char
219 *_token++ = '\0';
220
221 while (*_token) {
222 skip_whitespaces();
223
224 if (parse_uint_option("id:", &_id)) {
225 continue;
226 } else if (parse_uint_option("super:", &_super)) {
227 check_already_loaded("Super class", _super);
228 continue;
229 } else if (skip_token("interfaces:")) {
230 int i;
231 while (try_parse_uint(&i)) {
232 check_already_loaded("Interface", i);
233 _interfaces->append(i);
234 }
235 } else if (skip_token("source:")) {
236 skip_whitespaces();
237 _source = _token;
238 char* s = strchr(_token, ' ');
239 if (s == NULL) {
240 break; // end of input line
241 } else {
242 *s = '\0'; // mark the end of _source
243 _token = s+1;
244 }
245 } else {
246 error("Unknown input");
247 }
248 }
249
250 // if src is specified
251 // id super interfaces must all be specified
252 // loader may be specified
253 // else
254 // # the class is loaded from classpath
255 // id may be specified
256 // super, interfaces, loader must not be specified
257 return true;
258 }
259
260 void ClassListParser::split_tokens_by_whitespace(int offset) {
261 int start = offset;
262 int end;
263 bool done = false;
264 while (!done) {
265 while (_line[start] == ' ' || _line[start] == '\t') start++;
266 end = start;
267 while (_line[end] && _line[end] != ' ' && _line[end] != '\t') end++;
268 if (_line[end] == '\0') {
269 done = true;
270 } else {
271 _line[end] = '\0';
272 }
273 _indy_items->append(_line + start);
274 start = ++end;
275 }
276 }
277
278 int ClassListParser::split_at_tag_from_line() {
279 _token = _line;
280 char* ptr;
281 if ((ptr = strchr(_line, ' ')) == NULL) {
282 error("Too few items following the @ tag \"%s\" line #%d", _line, _line_no);
283 return 0;
284 }
285 *ptr++ = '\0';
286 while (*ptr == ' ' || *ptr == '\t') ptr++;
287 return (int)(ptr - _line);
288 }
289
290 bool ClassListParser::parse_at_tags() {
291 assert(_line[0] == '@', "must be");
292 int offset;
293 if ((offset = split_at_tag_from_line()) == 0) {
294 return false;
295 }
296
297 if (strcmp(_token, LAMBDA_PROXY_TAG) == 0) {
298 split_tokens_by_whitespace(offset);
299 if (_indy_items->length() < 2) {
300 error("Line with @ tag has too few items \"%s\" line #%d", _token, _line_no);
301 return false;
302 }
303 // set the class name
304 _class_name = _indy_items->at(0);
305 return true;
306 } else if (strcmp(_token, LAMBDA_FORM_TAG) == 0) {
307 LambdaFormInvokers::append(os::strdup((const char*)(_line + offset), mtInternal));
308 _lambda_form_line = true;
309 return true;
310 } else {
311 error("Invalid @ tag at the beginning of line \"%s\" line #%d", _token, _line_no);
312 return false;
313 }
314 }
315
316 void ClassListParser::skip_whitespaces() {
317 while (*_token == ' ' || *_token == '\t') {
318 _token ++;
319 }
320 }
321
322 void ClassListParser::skip_non_whitespaces() {
323 while (*_token && *_token != ' ' && *_token != '\t') {
324 _token ++;
325 }
326 }
327
328 void ClassListParser::parse_int(int* value) {
329 skip_whitespaces();
330 if (sscanf(_token, "%i", value) == 1) {
331 skip_non_whitespaces();
332 } else {
333 error("Error: expected integer");
334 }
335 }
336
337 void ClassListParser::parse_uint(int* value) {
338 parse_int(value);
339 if (*value < 0) {
340 error("Error: negative integers not allowed (%d)", *value);
341 }
342 }
343
344 bool ClassListParser::try_parse_uint(int* value) {
345 skip_whitespaces();
346 if (sscanf(_token, "%i", value) == 1) {
347 skip_non_whitespaces();
348 return true;
349 }
350 return false;
351 }
352
353 bool ClassListParser::skip_token(const char* option_name) {
354 size_t len = strlen(option_name);
355 if (strncmp(_token, option_name, len) == 0) {
356 _token += len;
357 return true;
358 } else {
359 return false;
360 }
361 }
362
363 bool ClassListParser::parse_int_option(const char* option_name, int* value) {
364 if (skip_token(option_name)) {
365 if (*value != _unspecified) {
366 error("%s specified twice", option_name);
367 } else {
368 parse_int(value);
369 return true;
370 }
371 }
372 return false;
373 }
374
375 bool ClassListParser::parse_uint_option(const char* option_name, int* value) {
376 if (skip_token(option_name)) {
377 if (*value != _unspecified) {
378 error("%s specified twice", option_name);
379 } else {
380 parse_uint(value);
381 return true;
382 }
383 }
384 return false;
385 }
386
387 void ClassListParser::print_specified_interfaces() {
388 const int n = _interfaces->length();
389 jio_fprintf(defaultStream::error_stream(), "Currently specified interfaces[%d] = {\n", n);
390 for (int i=0; i<n; i++) {
391 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
392 jio_fprintf(defaultStream::error_stream(), " %4d = %s\n", _interfaces->at(i), k->name()->as_klass_external_name());
393 }
394 jio_fprintf(defaultStream::error_stream(), "}\n");
395 }
396
397 void ClassListParser::print_actual_interfaces(InstanceKlass* ik) {
398 int n = ik->local_interfaces()->length();
399 jio_fprintf(defaultStream::error_stream(), "Actual interfaces[%d] = {\n", n);
400 for (int i = 0; i < n; i++) {
401 InstanceKlass* e = ik->local_interfaces()->at(i);
402 jio_fprintf(defaultStream::error_stream(), " %s\n", e->name()->as_klass_external_name());
403 }
404 jio_fprintf(defaultStream::error_stream(), "}\n");
405 }
406
407 void ClassListParser::error(const char* msg, ...) {
408 va_list ap;
409 va_start(ap, msg);
410 int error_index = _token - _line;
411 if (error_index >= _line_len) {
412 error_index = _line_len - 1;
413 }
414 if (error_index < 0) {
415 error_index = 0;
416 }
417
418 jio_fprintf(defaultStream::error_stream(),
419 "An error has occurred while processing class list file %s %d:%d.\n",
420 _classlist_file, _line_no, (error_index + 1));
421 jio_vfprintf(defaultStream::error_stream(), msg, ap);
422
423 if (_line_len <= 0) {
424 jio_fprintf(defaultStream::error_stream(), "\n");
425 } else {
426 jio_fprintf(defaultStream::error_stream(), ":\n");
427 for (int i=0; i<_line_len; i++) {
428 char c = _line[i];
429 if (c == '\0') {
430 jio_fprintf(defaultStream::error_stream(), "%s", " ");
431 } else {
432 jio_fprintf(defaultStream::error_stream(), "%c", c);
433 }
434 }
435 jio_fprintf(defaultStream::error_stream(), "\n");
436 for (int i=0; i<error_index; i++) {
437 jio_fprintf(defaultStream::error_stream(), "%s", " ");
438 }
439 jio_fprintf(defaultStream::error_stream(), "^\n");
440 }
441
442 vm_exit_during_initialization("class list format error.", NULL);
443 va_end(ap);
444 }
445
446 // This function is used for loading classes for customized class loaders
447 // during archive dumping.
448 InstanceKlass* ClassListParser::load_class_from_source(Symbol* class_name, TRAPS) {
449 #if !(defined(_LP64) && (defined(LINUX) || defined(__APPLE__)))
450 // The only supported platforms are: (1) Linux/64-bit and (2) Solaris/64-bit and
451 // (3) MacOSX/64-bit
452 // This #if condition should be in sync with the areCustomLoadersSupportedForCDS
453 // method in test/lib/jdk/test/lib/Platform.java.
454 error("AppCDS custom class loaders not supported on this platform");
455 #endif
456
457 if (!is_super_specified()) {
458 error("If source location is specified, super class must be also specified");
459 }
460 if (!is_id_specified()) {
461 error("If source location is specified, id must be also specified");
462 }
463 if (strncmp(_class_name, "java/", 5) == 0) {
464 log_info(cds)("Prohibited package for non-bootstrap classes: %s.class from %s",
465 _class_name, _source);
466 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
467 }
468
469 InstanceKlass* k = UnregisteredClasses::load_class(class_name, _source, CHECK_NULL);
470 if (k->local_interfaces()->length() != _interfaces->length()) {
471 print_specified_interfaces();
472 print_actual_interfaces(k);
473 error("The number of interfaces (%d) specified in class list does not match the class file (%d)",
474 _interfaces->length(), k->local_interfaces()->length());
475 }
476
477 assert(k->is_shared_unregistered_class(), "must be");
478
479 bool added = SystemDictionaryShared::add_unregistered_class(THREAD, k);
480 if (!added) {
481 // We allow only a single unregistered class for each unique name.
482 error("Duplicated class %s", _class_name);
483 }
484
485 return k;
486 }
487
488 void ClassListParser::populate_cds_indy_info(const constantPoolHandle &pool, int cp_index, CDSIndyInfo* cii, TRAPS) {
489 // Caller needs to allocate ResourceMark.
490 int type_index = pool->bootstrap_name_and_type_ref_index_at(cp_index);
491 int name_index = pool->name_ref_index_at(type_index);
492 cii->add_item(pool->symbol_at(name_index)->as_C_string());
493 int sig_index = pool->signature_ref_index_at(type_index);
494 cii->add_item(pool->symbol_at(sig_index)->as_C_string());
495 int argc = pool->bootstrap_argument_count_at(cp_index);
496 if (argc > 0) {
497 for (int arg_i = 0; arg_i < argc; arg_i++) {
498 int arg = pool->bootstrap_argument_index_at(cp_index, arg_i);
499 jbyte tag = pool->tag_at(arg).value();
500 if (tag == JVM_CONSTANT_MethodType) {
501 cii->add_item(pool->method_type_signature_at(arg)->as_C_string());
502 } else if (tag == JVM_CONSTANT_MethodHandle) {
503 cii->add_ref_kind(pool->method_handle_ref_kind_at(arg));
504 int callee_index = pool->method_handle_klass_index_at(arg);
505 Klass* callee = pool->klass_at(callee_index, CHECK);
506 cii->add_item(callee->name()->as_C_string());
507 cii->add_item(pool->method_handle_name_ref_at(arg)->as_C_string());
508 cii->add_item(pool->method_handle_signature_ref_at(arg)->as_C_string());
509 } else {
510 ShouldNotReachHere();
511 }
512 }
513 }
514 }
515
516 bool ClassListParser::is_matching_cp_entry(const constantPoolHandle &pool, int cp_index, TRAPS) {
517 ResourceMark rm(THREAD);
518 CDSIndyInfo cii;
519 populate_cds_indy_info(pool, cp_index, &cii, CHECK_0);
520 GrowableArray<const char*>* items = cii.items();
521 int indy_info_offset = 1;
522 if (_indy_items->length() - indy_info_offset != items->length()) {
523 return false;
524 }
525 for (int i = 0; i < items->length(); i++) {
526 if (strcmp(_indy_items->at(i + indy_info_offset), items->at(i)) != 0) {
527 return false;
528 }
529 }
530 return true;
531 }
532
533 void ClassListParser::resolve_indy(JavaThread* current, Symbol* class_name_symbol) {
534 ExceptionMark em(current);
535 JavaThread* THREAD = current; // For exception macros.
536 ClassListParser::resolve_indy_impl(class_name_symbol, THREAD);
537 if (HAS_PENDING_EXCEPTION) {
538 ResourceMark rm(current);
539 char* ex_msg = (char*)"";
540 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
541 if (message != NULL) {
542 ex_msg = java_lang_String::as_utf8_string(message);
543 }
544 log_warning(cds)("resolve_indy for class %s has encountered exception: %s %s",
545 class_name_symbol->as_C_string(),
546 PENDING_EXCEPTION->klass()->external_name(),
547 ex_msg);
548 CLEAR_PENDING_EXCEPTION;
549 }
550 }
551
552 void ClassListParser::resolve_indy_impl(Symbol* class_name_symbol, TRAPS) {
553 Handle class_loader(THREAD, SystemDictionary::java_system_loader());
554 Handle protection_domain;
555 Klass* klass = SystemDictionary::resolve_or_fail(class_name_symbol, class_loader, protection_domain, true, CHECK);
556 if (klass->is_instance_klass()) {
557 InstanceKlass* ik = InstanceKlass::cast(klass);
558 MetaspaceShared::try_link_class(THREAD, ik);
559 if (!ik->is_linked()) {
560 // Verification of ik has failed
561 return;
562 }
563
564 ConstantPool* cp = ik->constants();
565 ConstantPoolCache* cpcache = cp->cache();
566 bool found = false;
567 for (int cpcindex = 0; cpcindex < cpcache->length(); cpcindex ++) {
568 int indy_index = ConstantPool::encode_invokedynamic_index(cpcindex);
569 ConstantPoolCacheEntry* cpce = cpcache->entry_at(cpcindex);
570 int pool_index = cpce->constant_pool_index();
571 constantPoolHandle pool(THREAD, cp);
572 if (pool->tag_at(pool_index).is_invoke_dynamic()) {
573 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
574 Handle bsm = bootstrap_specifier.resolve_bsm(CHECK);
575 if (!SystemDictionaryShared::is_supported_invokedynamic(&bootstrap_specifier)) {
576 log_debug(cds, lambda)("is_supported_invokedynamic check failed for cp_index %d", pool_index);
577 continue;
578 }
579 bool matched = is_matching_cp_entry(pool, pool_index, CHECK);
580 if (matched) {
581 found = true;
582 CallInfo info;
583 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(info, CHECK);
584 if (!is_done) {
585 // resolve it
586 Handle recv;
587 LinkResolver::resolve_invoke(info, recv, pool, indy_index, Bytecodes::_invokedynamic, CHECK);
588 break;
589 }
590 cpce->set_dynamic_call(pool, info);
591 }
592 }
593 }
594 if (!found) {
595 ResourceMark rm(THREAD);
596 log_warning(cds)("No invoke dynamic constant pool entry can be found for class %s. The classlist is probably out-of-date.",
597 class_name_symbol->as_C_string());
598 }
599 }
600 }
601
602 Klass* ClassListParser::load_current_class(Symbol* class_name_symbol, TRAPS) {
603 Klass* klass;
604 if (!is_loading_from_source()) {
605 // Load classes for the boot/platform/app loaders only.
606 if (is_super_specified()) {
607 error("If source location is not specified, super class must not be specified");
608 }
609 if (are_interfaces_specified()) {
610 error("If source location is not specified, interface(s) must not be specified");
611 }
612
613 if (Signature::is_array(class_name_symbol)) {
614 // array classes are not supported in class list.
615 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
616 }
617
618 JavaValue result(T_OBJECT);
619 // Call java_system_loader().loadClass() directly, which will
620 // delegate to the correct loader (boot, platform or app) depending on
621 // the package name.
622
623 // ClassLoader.loadClass() wants external class name format, i.e., convert '/' chars to '.'
624 Handle ext_class_name = java_lang_String::externalize_classname(class_name_symbol, CHECK_NULL);
625 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
626
627 JavaCalls::call_virtual(&result,
628 loader, //SystemDictionary::java_system_loader(),
629 vmClasses::ClassLoader_klass(),
630 vmSymbols::loadClass_name(),
631 vmSymbols::string_class_signature(),
632 ext_class_name,
633 CHECK_NULL);
634
635 assert(result.get_type() == T_OBJECT, "just checking");
636 oop obj = result.get_oop();
637 assert(obj != NULL, "jdk.internal.loader.BuiltinClassLoader::loadClass never returns null");
638 klass = java_lang_Class::as_Klass(obj);
639 } else {
640 // If "source:" tag is specified, all super class and super interfaces must be specified in the
641 // class list file.
642 klass = load_class_from_source(class_name_symbol, CHECK_NULL);
643 }
644
645 assert(klass != NULL, "exception should have been thrown");
646 assert(klass->is_instance_klass(), "array classes should have been filtered out");
647
648 if (is_id_specified()) {
649 InstanceKlass* ik = InstanceKlass::cast(klass);
650 int id = this->id();
651 SystemDictionaryShared::update_shared_entry(ik, id);
652 bool created;
653 id2klass_table()->put_if_absent(id, ik, &created);
654 if (!created) {
655 error("Duplicated ID %d for class %s", id, _class_name);
656 }
657 if (id2klass_table()->maybe_grow()) {
658 log_info(cds, hashtables)("Expanded id2klass_table() to %d", id2klass_table()->table_size());
659 }
660 }
661
662 return klass;
663 }
664
665 bool ClassListParser::is_loading_from_source() {
666 return (_source != NULL);
667 }
668
669 InstanceKlass* ClassListParser::lookup_class_by_id(int id) {
670 InstanceKlass** klass_ptr = id2klass_table()->get(id);
671 if (klass_ptr == NULL) {
672 error("Class ID %d has not been defined", id);
673 }
674 assert(*klass_ptr != NULL, "must be");
675 return *klass_ptr;
676 }
677
678
679 InstanceKlass* ClassListParser::lookup_super_for_current_class(Symbol* super_name) {
680 if (!is_loading_from_source()) {
681 return NULL;
682 }
683
684 InstanceKlass* k = lookup_class_by_id(super());
685 if (super_name != k->name()) {
686 error("The specified super class %s (id %d) does not match actual super class %s",
687 k->name()->as_klass_external_name(), super(),
688 super_name->as_klass_external_name());
689 }
690 return k;
691 }
692
693 InstanceKlass* ClassListParser::lookup_interface_for_current_class(Symbol* interface_name) {
694 if (!is_loading_from_source()) {
695 return NULL;
696 }
697
698 const int n = _interfaces->length();
699 if (n == 0) {
700 error("Class %s implements the interface %s, but no interface has been specified in the input line",
701 _class_name, interface_name->as_klass_external_name());
702 ShouldNotReachHere();
703 }
704
705 int i;
706 for (i=0; i<n; i++) {
707 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
708 if (interface_name == k->name()) {
709 return k;
710 }
711 }
712
713 // interface_name is not specified by the "interfaces:" keyword.
714 print_specified_interfaces();
715 error("The interface %s implemented by class %s does not match any of the specified interface IDs",
716 interface_name->as_klass_external_name(), _class_name);
717 ShouldNotReachHere();
718 return NULL;
719 }