1 /*
2 * Copyright (c) 2015, 2023, 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 "cds/archiveUtils.hpp"
27 #include "cds/classListParser.hpp"
28 #include "cds/lambdaFormInvokers.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "cds/unregisteredClasses.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/systemDictionaryShared.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "interpreter/bytecodeStream.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "jimage.hpp"
42 #include "jvm.h"
43 #include "logging/log.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/constantPool.inline.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/macros.hpp"
53
54 volatile Thread* ClassListParser::_parsing_thread = nullptr;
55 ClassListParser* ClassListParser::_instance = nullptr;
56
57 ClassListParser::ClassListParser(const char* file, ParseMode parse_mode) : _id2klass_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE) {
58 log_info(cds)("Parsing %s%s", file,
59 (parse_mode == _parse_lambda_forms_invokers_only) ? " (lambda form invokers only)" : "");
60 _classlist_file = file;
61 _file = nullptr;
62 // Use os::open() because neither fopen() nor os::fopen()
63 // can handle long path name on Windows.
64 int fd = os::open(file, O_RDONLY, S_IREAD);
65 if (fd != -1) {
66 // Obtain a File* from the file descriptor so that fgets()
67 // can be used in parse_one_line()
68 _file = os::fdopen(fd, "r");
69 }
70 if (_file == nullptr) {
71 char errmsg[JVM_MAXPATHLEN];
72 os::lasterror(errmsg, JVM_MAXPATHLEN);
73 vm_exit_during_initialization("Loading classlist failed", errmsg);
74 }
75 _line_no = 0;
76 _interfaces = new (mtClass) GrowableArray<int>(10, mtClass);
77 _indy_items = new (mtClass) GrowableArray<const char*>(9, mtClass);
78 _parse_mode = parse_mode;
79
80 // _instance should only be accessed by the thread that created _instance.
81 assert(_instance == nullptr, "must be singleton");
82 _instance = this;
83 Atomic::store(&_parsing_thread, Thread::current());
84 }
85
86 bool ClassListParser::is_parsing_thread() {
87 return Atomic::load(&_parsing_thread) == Thread::current();
88 }
89
90 ClassListParser::~ClassListParser() {
91 if (_file != nullptr) {
92 fclose(_file);
93 }
94 Atomic::store(&_parsing_thread, (Thread*)nullptr);
95 delete _indy_items;
96 delete _interfaces;
97 _instance = nullptr;
98 }
99
100 int ClassListParser::parse(TRAPS) {
101 int class_count = 0;
102
103 while (parse_one_line()) {
104 if (lambda_form_line()) {
105 // The current line is "@lambda-form-invoker ...". It has been recorded in LambdaFormInvokers,
106 // and will be processed later.
107 continue;
108 }
109
110 if (_parse_mode == _parse_lambda_forms_invokers_only) {
111 continue;
112 }
113
114 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(_class_name);
115 if (_indy_items->length() > 0) {
116 // The current line is "@lambda-proxy class_name". Load the proxy class.
117 resolve_indy(THREAD, class_name_symbol);
118 class_count++;
119 continue;
120 }
121
122 Klass* klass = load_current_class(class_name_symbol, THREAD);
123 if (HAS_PENDING_EXCEPTION) {
124 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
125 // If we have run out of memory, don't try to load the rest of the classes in
126 // the classlist. Throw an exception, which will terminate the dumping process.
127 return 0; // THROW
128 }
129
130 ResourceMark rm(THREAD);
131 char* ex_msg = (char*)"";
132 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
133 if (message != nullptr) {
134 ex_msg = java_lang_String::as_utf8_string(message);
135 }
136 log_warning(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(), ex_msg);
137 // We might have an invalid class name or an bad class. Warn about it
138 // and keep going to the next line.
139 CLEAR_PENDING_EXCEPTION;
140 log_warning(cds)("Preload Warning: Cannot find %s", _class_name);
141 continue;
142 }
143
144 assert(klass != nullptr, "sanity");
145 if (log_is_enabled(Trace, cds)) {
146 ResourceMark rm(THREAD);
147 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
148 }
149
150 if (klass->is_instance_klass()) {
151 InstanceKlass* ik = InstanceKlass::cast(klass);
152
153 // Link the class to cause the bytecodes to be rewritten and the
154 // cpcache to be created. The linking is done as soon as classes
155 // are loaded in order that the related data structures (klass and
156 // cpCache) are located together.
157 MetaspaceShared::try_link_class(THREAD, ik);
158 }
159
160 class_count++;
161 }
162
163 return class_count;
164 }
165
166 bool ClassListParser::parse_one_line() {
167 for (;;) {
168 if (fgets(_line, sizeof(_line), _file) == nullptr) {
169 return false;
170 }
171 ++ _line_no;
172 _line_len = (int)strlen(_line);
173 if (_line_len > _max_allowed_line_len) {
174 error("input line too long (must be no longer than %d chars)", _max_allowed_line_len);
175 }
176 if (*_line == '#') { // comment
177 continue;
178 }
179
180 {
181 int len = (int)strlen(_line);
182 int i;
183 // Replace \t\r\n\f with ' '
184 for (i=0; i<len; i++) {
185 if (_line[i] == '\t' || _line[i] == '\r' || _line[i] == '\n' || _line[i] == '\f') {
186 _line[i] = ' ';
187 }
188 }
189
190 // Remove trailing newline/space
191 while (len > 0) {
192 if (_line[len-1] == ' ') {
193 _line[len-1] = '\0';
194 len --;
195 } else {
196 break;
197 }
198 }
199 _line_len = len;
200 }
201
202 // valid line
203 break;
204 }
205
206 _class_name = _line;
207 _id = _unspecified;
208 _super = _unspecified;
209 _interfaces->clear();
210 _source = nullptr;
211 _interfaces_specified = false;
212 _indy_items->clear();
213 _lambda_form_line = false;
214
215 if (_line[0] == '@') {
216 return parse_at_tags();
217 }
218
219 if ((_token = strchr(_line, ' ')) == nullptr) {
220 // No optional arguments are specified.
221 return true;
222 }
223
224 // Mark the end of the name, and go to the next input char
225 *_token++ = '\0';
226
227 while (*_token) {
228 skip_whitespaces();
229
230 if (parse_uint_option("id:", &_id)) {
231 continue;
232 } else if (parse_uint_option("super:", &_super)) {
233 check_already_loaded("Super class", _super);
234 continue;
235 } else if (skip_token("interfaces:")) {
236 int i;
237 while (try_parse_uint(&i)) {
238 check_already_loaded("Interface", i);
239 _interfaces->append(i);
240 }
241 } else if (skip_token("source:")) {
242 skip_whitespaces();
243 _source = _token;
244 char* s = strchr(_token, ' ');
245 if (s == nullptr) {
246 break; // end of input line
247 } else {
248 *s = '\0'; // mark the end of _source
249 _token = s+1;
250 }
251 } else {
252 error("Unknown input");
253 }
254 }
255
256 // if src is specified
257 // id super interfaces must all be specified
258 // loader may be specified
259 // else
260 // # the class is loaded from classpath
261 // id may be specified
262 // super, interfaces, loader must not be specified
263 return true;
264 }
265
266 void ClassListParser::split_tokens_by_whitespace(int offset) {
267 int start = offset;
268 int end;
269 bool done = false;
270 while (!done) {
271 while (_line[start] == ' ' || _line[start] == '\t') start++;
272 end = start;
273 while (_line[end] && _line[end] != ' ' && _line[end] != '\t') end++;
274 if (_line[end] == '\0') {
275 done = true;
276 } else {
277 _line[end] = '\0';
278 }
279 _indy_items->append(_line + start);
280 start = ++end;
281 }
282 }
283
284 int ClassListParser::split_at_tag_from_line() {
285 _token = _line;
286 char* ptr;
287 if ((ptr = strchr(_line, ' ')) == nullptr) {
288 error("Too few items following the @ tag \"%s\" line #%d", _line, _line_no);
289 return 0;
290 }
291 *ptr++ = '\0';
292 while (*ptr == ' ' || *ptr == '\t') ptr++;
293 return (int)(ptr - _line);
294 }
295
296 bool ClassListParser::parse_at_tags() {
297 assert(_line[0] == '@', "must be");
298 int offset;
299 if ((offset = split_at_tag_from_line()) == 0) {
300 return false;
301 }
302
303 if (strcmp(_token, LAMBDA_PROXY_TAG) == 0) {
304 split_tokens_by_whitespace(offset);
305 if (_indy_items->length() < 2) {
306 error("Line with @ tag has too few items \"%s\" line #%d", _token, _line_no);
307 return false;
308 }
309 // set the class name
310 _class_name = _indy_items->at(0);
311 return true;
312 } else if (strcmp(_token, LAMBDA_FORM_TAG) == 0) {
313 LambdaFormInvokers::append(os::strdup((const char*)(_line + offset), mtInternal));
314 _lambda_form_line = true;
315 return true;
316 } else {
317 error("Invalid @ tag at the beginning of line \"%s\" line #%d", _token, _line_no);
318 return false;
319 }
320 }
321
322 void ClassListParser::skip_whitespaces() {
323 while (*_token == ' ' || *_token == '\t') {
324 _token ++;
325 }
326 }
327
328 void ClassListParser::skip_non_whitespaces() {
329 while (*_token && *_token != ' ' && *_token != '\t') {
330 _token ++;
331 }
332 }
333
334 void ClassListParser::parse_int(int* value) {
335 skip_whitespaces();
336 if (sscanf(_token, "%i", value) == 1) {
337 skip_non_whitespaces();
338 } else {
339 error("Error: expected integer");
340 }
341 }
342
343 void ClassListParser::parse_uint(int* value) {
344 parse_int(value);
345 if (*value < 0) {
346 error("Error: negative integers not allowed (%d)", *value);
347 }
348 }
349
350 bool ClassListParser::try_parse_uint(int* value) {
351 skip_whitespaces();
352 if (sscanf(_token, "%i", value) == 1) {
353 skip_non_whitespaces();
354 return true;
355 }
356 return false;
357 }
358
359 bool ClassListParser::skip_token(const char* option_name) {
360 size_t len = strlen(option_name);
361 if (strncmp(_token, option_name, len) == 0) {
362 _token += len;
363 return true;
364 } else {
365 return false;
366 }
367 }
368
369 bool ClassListParser::parse_int_option(const char* option_name, int* value) {
370 if (skip_token(option_name)) {
371 if (*value != _unspecified) {
372 error("%s specified twice", option_name);
373 } else {
374 parse_int(value);
375 return true;
376 }
377 }
378 return false;
379 }
380
381 bool ClassListParser::parse_uint_option(const char* option_name, int* value) {
382 if (skip_token(option_name)) {
383 if (*value != _unspecified) {
384 error("%s specified twice", option_name);
385 } else {
386 parse_uint(value);
387 return true;
388 }
389 }
390 return false;
391 }
392
393 void ClassListParser::print_specified_interfaces() {
394 const int n = _interfaces->length();
395 jio_fprintf(defaultStream::error_stream(), "Currently specified interfaces[%d] = {\n", n);
396 for (int i=0; i<n; i++) {
397 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
398 jio_fprintf(defaultStream::error_stream(), " %4d = %s\n", _interfaces->at(i), k->name()->as_klass_external_name());
399 }
400 jio_fprintf(defaultStream::error_stream(), "}\n");
401 }
402
403 void ClassListParser::print_actual_interfaces(InstanceKlass* ik) {
404 int n = ik->local_interfaces()->length();
405 jio_fprintf(defaultStream::error_stream(), "Actual interfaces[%d] = {\n", n);
406 for (int i = 0; i < n; i++) {
407 InstanceKlass* e = ik->local_interfaces()->at(i);
408 jio_fprintf(defaultStream::error_stream(), " %s\n", e->name()->as_klass_external_name());
409 }
410 jio_fprintf(defaultStream::error_stream(), "}\n");
411 }
412
413 void ClassListParser::error(const char* msg, ...) {
414 va_list ap;
415 va_start(ap, msg);
416 int error_index = _token - _line;
417 if (error_index >= _line_len) {
418 error_index = _line_len - 1;
419 }
420 if (error_index < 0) {
421 error_index = 0;
422 }
423
424 jio_fprintf(defaultStream::error_stream(),
425 "An error has occurred while processing class list file %s %d:%d.\n",
426 _classlist_file, _line_no, (error_index + 1));
427 jio_vfprintf(defaultStream::error_stream(), msg, ap);
428
429 if (_line_len <= 0) {
430 jio_fprintf(defaultStream::error_stream(), "\n");
431 } else {
432 jio_fprintf(defaultStream::error_stream(), ":\n");
433 for (int i=0; i<_line_len; i++) {
434 char c = _line[i];
435 if (c == '\0') {
436 jio_fprintf(defaultStream::error_stream(), "%s", " ");
437 } else {
438 jio_fprintf(defaultStream::error_stream(), "%c", c);
439 }
440 }
441 jio_fprintf(defaultStream::error_stream(), "\n");
442 for (int i=0; i<error_index; i++) {
443 jio_fprintf(defaultStream::error_stream(), "%s", " ");
444 }
445 jio_fprintf(defaultStream::error_stream(), "^\n");
446 }
447
448 vm_exit_during_initialization("class list format error.", nullptr);
449 va_end(ap);
450 }
451
452 // This function is used for loading classes for customized class loaders
453 // during archive dumping.
454 InstanceKlass* ClassListParser::load_class_from_source(Symbol* class_name, TRAPS) {
455 #if !(defined(_LP64) && (defined(LINUX) || defined(__APPLE__) || defined(_WINDOWS)))
456 // The only supported platforms are: (1) Linux/64-bit and (2) Solaris/64-bit and
457 // (3) MacOSX/64-bit and (4) Windowss/64-bit
458 // This #if condition should be in sync with the areCustomLoadersSupportedForCDS
459 // method in test/lib/jdk/test/lib/Platform.java.
460 error("AppCDS custom class loaders not supported on this platform");
461 #endif
462
463 if (!is_super_specified()) {
464 error("If source location is specified, super class must be also specified");
465 }
466 if (!is_id_specified()) {
467 error("If source location is specified, id must be also specified");
468 }
469 if (strncmp(_class_name, "java/", 5) == 0) {
470 log_info(cds)("Prohibited package for non-bootstrap classes: %s.class from %s",
471 _class_name, _source);
472 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
473 }
474
475 InstanceKlass* k = UnregisteredClasses::load_class(class_name, _source, CHECK_NULL);
476 const int actual_num_interfaces = k->local_interfaces()->length();
477 const int specified_num_interfaces = _interfaces->length(); // specified in classlist
478 int expected_num_interfaces = actual_num_interfaces;
479
480 if (specified_num_interfaces != expected_num_interfaces) {
481 print_specified_interfaces();
482 print_actual_interfaces(k);
483 error("The number of interfaces (%d) specified in class list does not match the class file (%d)",
484 specified_num_interfaces, expected_num_interfaces);
485 }
486
487 assert(k->is_shared_unregistered_class(), "must be");
488
489 bool added = SystemDictionaryShared::add_unregistered_class(THREAD, k);
490 if (!added) {
491 // We allow only a single unregistered class for each unique name.
492 error("Duplicated class %s", _class_name);
493 }
494
495 return k;
496 }
497
498 void ClassListParser::populate_cds_indy_info(const constantPoolHandle &pool, int cp_index, CDSIndyInfo* cii, TRAPS) {
499 // Caller needs to allocate ResourceMark.
500 int type_index = pool->bootstrap_name_and_type_ref_index_at(cp_index);
501 int name_index = pool->name_ref_index_at(type_index);
502 cii->add_item(pool->symbol_at(name_index)->as_C_string());
503 int sig_index = pool->signature_ref_index_at(type_index);
504 cii->add_item(pool->symbol_at(sig_index)->as_C_string());
505 int argc = pool->bootstrap_argument_count_at(cp_index);
506 if (argc > 0) {
507 for (int arg_i = 0; arg_i < argc; arg_i++) {
508 int arg = pool->bootstrap_argument_index_at(cp_index, arg_i);
509 jbyte tag = pool->tag_at(arg).value();
510 if (tag == JVM_CONSTANT_MethodType) {
511 cii->add_item(pool->method_type_signature_at(arg)->as_C_string());
512 } else if (tag == JVM_CONSTANT_MethodHandle) {
513 cii->add_ref_kind(pool->method_handle_ref_kind_at(arg));
514 int callee_index = pool->method_handle_klass_index_at(arg);
515 Klass* callee = pool->klass_at(callee_index, CHECK);
516 cii->add_item(callee->name()->as_C_string());
517 cii->add_item(pool->method_handle_name_ref_at(arg)->as_C_string());
518 cii->add_item(pool->method_handle_signature_ref_at(arg)->as_C_string());
519 } else {
520 ShouldNotReachHere();
521 }
522 }
523 }
524 }
525
526 bool ClassListParser::is_matching_cp_entry(const constantPoolHandle &pool, int cp_index, TRAPS) {
527 ResourceMark rm(THREAD);
528 CDSIndyInfo cii;
529 populate_cds_indy_info(pool, cp_index, &cii, CHECK_0);
530 GrowableArray<const char*>* items = cii.items();
531 int indy_info_offset = 1;
532 if (_indy_items->length() - indy_info_offset != items->length()) {
533 return false;
534 }
535 for (int i = 0; i < items->length(); i++) {
536 if (strcmp(_indy_items->at(i + indy_info_offset), items->at(i)) != 0) {
537 return false;
538 }
539 }
540 return true;
541 }
542
543 void ClassListParser::resolve_indy(JavaThread* current, Symbol* class_name_symbol) {
544 ExceptionMark em(current);
545 JavaThread* THREAD = current; // For exception macros.
546 ClassListParser::resolve_indy_impl(class_name_symbol, THREAD);
547 if (HAS_PENDING_EXCEPTION) {
548 ResourceMark rm(current);
549 char* ex_msg = (char*)"";
550 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
551 if (message != nullptr) {
552 ex_msg = java_lang_String::as_utf8_string(message);
553 }
554 log_warning(cds)("resolve_indy for class %s has encountered exception: %s %s",
555 class_name_symbol->as_C_string(),
556 PENDING_EXCEPTION->klass()->external_name(),
557 ex_msg);
558 CLEAR_PENDING_EXCEPTION;
559 }
560 }
561
562 void ClassListParser::resolve_indy_impl(Symbol* class_name_symbol, TRAPS) {
563 Handle class_loader(THREAD, SystemDictionary::java_system_loader());
564 Handle protection_domain;
565 Klass* klass = SystemDictionary::resolve_or_fail(class_name_symbol, class_loader, protection_domain, true, CHECK);
566 if (klass->is_instance_klass()) {
567 InstanceKlass* ik = InstanceKlass::cast(klass);
568 MetaspaceShared::try_link_class(THREAD, ik);
569 if (!ik->is_linked()) {
570 // Verification of ik has failed
571 return;
572 }
573
574 ConstantPool* cp = ik->constants();
575 ConstantPoolCache* cpcache = cp->cache();
576 bool found = false;
577 for (int indy_index = 0; indy_index < cpcache->resolved_indy_entries_length(); indy_index++) {
578 int pool_index = cpcache->resolved_indy_entry_at(indy_index)->constant_pool_index();
579 constantPoolHandle pool(THREAD, cp);
580 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
581 Handle bsm = bootstrap_specifier.resolve_bsm(CHECK);
582 if (!SystemDictionaryShared::is_supported_invokedynamic(&bootstrap_specifier)) {
583 log_debug(cds, lambda)("is_supported_invokedynamic check failed for cp_index %d", pool_index);
584 continue;
585 }
586 bool matched = is_matching_cp_entry(pool, pool_index, CHECK);
587 if (matched) {
588 found = true;
589 CallInfo info;
590 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(info, CHECK);
591 if (!is_done) {
592 // resolve it
593 Handle recv;
594 LinkResolver::resolve_invoke(info,
595 recv,
596 pool,
597 ConstantPool::encode_invokedynamic_index(indy_index),
598 Bytecodes::_invokedynamic, CHECK);
599 break;
600 }
601 cpcache->set_dynamic_call(info, indy_index);
602 }
603 }
604 if (!found) {
605 ResourceMark rm(THREAD);
606 log_warning(cds)("No invoke dynamic constant pool entry can be found for class %s. The classlist is probably out-of-date.",
607 class_name_symbol->as_C_string());
608 }
609 }
610 }
611
612 Klass* ClassListParser::load_current_class(Symbol* class_name_symbol, TRAPS) {
613 Klass* klass;
614 if (!is_loading_from_source()) {
615 // Load classes for the boot/platform/app loaders only.
616 if (is_super_specified()) {
617 error("If source location is not specified, super class must not be specified");
618 }
619 if (are_interfaces_specified()) {
620 error("If source location is not specified, interface(s) must not be specified");
621 }
622
623 if (Signature::is_array(class_name_symbol)) {
624 // array classes are not supported in class list.
625 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
626 }
627
628 JavaValue result(T_OBJECT);
629 // Call java_system_loader().loadClass() directly, which will
630 // delegate to the correct loader (boot, platform or app) depending on
631 // the package name.
632
633 // ClassLoader.loadClass() wants external class name format, i.e., convert '/' chars to '.'
634 Handle ext_class_name = java_lang_String::externalize_classname(class_name_symbol, CHECK_NULL);
635 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
636
637 JavaCalls::call_virtual(&result,
638 loader, //SystemDictionary::java_system_loader(),
639 vmClasses::ClassLoader_klass(),
640 vmSymbols::loadClass_name(),
641 vmSymbols::string_class_signature(),
642 ext_class_name,
643 CHECK_NULL);
644
645 assert(result.get_type() == T_OBJECT, "just checking");
646 oop obj = result.get_oop();
647 assert(obj != nullptr, "jdk.internal.loader.BuiltinClassLoader::loadClass never returns null");
648 klass = java_lang_Class::as_Klass(obj);
649 } else {
650 // If "source:" tag is specified, all super class and super interfaces must be specified in the
651 // class list file.
652 klass = load_class_from_source(class_name_symbol, CHECK_NULL);
653 }
654
655 assert(klass != nullptr, "exception should have been thrown");
656 assert(klass->is_instance_klass(), "array classes should have been filtered out");
657
658 if (is_id_specified()) {
659 InstanceKlass* ik = InstanceKlass::cast(klass);
660 int id = this->id();
661 SystemDictionaryShared::update_shared_entry(ik, id);
662 bool created;
663 id2klass_table()->put_if_absent(id, ik, &created);
664 if (!created) {
665 error("Duplicated ID %d for class %s", id, _class_name);
666 }
667 if (id2klass_table()->maybe_grow()) {
668 log_info(cds, hashtables)("Expanded id2klass_table() to %d", id2klass_table()->table_size());
669 }
670 }
671
672 return klass;
673 }
674
675 bool ClassListParser::is_loading_from_source() {
676 return (_source != nullptr);
677 }
678
679 InstanceKlass* ClassListParser::lookup_class_by_id(int id) {
680 InstanceKlass** klass_ptr = id2klass_table()->get(id);
681 if (klass_ptr == nullptr) {
682 error("Class ID %d has not been defined", id);
683 }
684 assert(*klass_ptr != nullptr, "must be");
685 return *klass_ptr;
686 }
687
688
689 InstanceKlass* ClassListParser::lookup_super_for_current_class(Symbol* super_name) {
690 if (!is_loading_from_source()) {
691 return nullptr;
692 }
693
694 InstanceKlass* k = lookup_class_by_id(super());
695 if (super_name != k->name()) {
696 error("The specified super class %s (id %d) does not match actual super class %s",
697 k->name()->as_klass_external_name(), super(),
698 super_name->as_klass_external_name());
699 }
700 return k;
701 }
702
703 InstanceKlass* ClassListParser::lookup_interface_for_current_class(Symbol* interface_name) {
704 if (!is_loading_from_source()) {
705 return nullptr;
706 }
707
708 const int n = _interfaces->length();
709 if (n == 0) {
710 error("Class %s implements the interface %s, but no interface has been specified in the input line",
711 _class_name, interface_name->as_klass_external_name());
712 ShouldNotReachHere();
713 }
714
715 int i;
716 for (i=0; i<n; i++) {
717 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
718 if (interface_name == k->name()) {
719 return k;
720 }
721 }
722
723 // interface_name is not specified by the "interfaces:" keyword.
724 print_specified_interfaces();
725 error("The interface %s implemented by class %s does not match any of the specified interface IDs",
726 interface_name->as_klass_external_name(), _class_name);
727 ShouldNotReachHere();
728 return nullptr;
729 }