1 /*
2 * Copyright (c) 2015, 2024, 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 #include "utilities/utf8.hpp"
54
55 volatile Thread* ClassListParser::_parsing_thread = nullptr;
56 ClassListParser* ClassListParser::_instance = nullptr;
57
58 ClassListParser::ClassListParser(const char* file, ParseMode parse_mode) :
59 _classlist_file(file),
60 _id2klass_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
61 _file_input(do_open(file), /* need_close=*/true),
62 _input_stream(&_file_input),
63 _parse_mode(parse_mode) {
64 log_info(cds)("Parsing %s%s", file,
65 parse_lambda_forms_invokers_only() ? " (lambda form invokers only)" : "");
66 if (!_file_input.is_open()) {
67 char errmsg[JVM_MAXPATHLEN];
68 os::lasterror(errmsg, JVM_MAXPATHLEN);
69 vm_exit_during_initialization("Loading classlist failed", errmsg);
70 }
71 _token = _line = nullptr;
72 _interfaces = new (mtClass) GrowableArray<int>(10, mtClass);
73 _indy_items = new (mtClass) GrowableArray<const char*>(9, mtClass);
74
75 // _instance should only be accessed by the thread that created _instance.
76 assert(_instance == nullptr, "must be singleton");
77 _instance = this;
78 Atomic::store(&_parsing_thread, Thread::current());
79 }
80
81 FILE* ClassListParser::do_open(const char* file) {
82 // Use os::open() because neither fopen() nor os::fopen()
83 // can handle long path name on Windows. (See JDK-8216184)
84 int fd = os::open(file, O_RDONLY, S_IREAD);
85 FILE* fp = nullptr;
86 if (fd != -1) {
87 // Obtain a FILE* from the file descriptor so that _input_stream
88 // can be used in ClassListParser::parse()
89 fp = os::fdopen(fd, "r");
90 }
91 return fp;
92 }
93
94 bool ClassListParser::is_parsing_thread() {
95 return Atomic::load(&_parsing_thread) == Thread::current();
96 }
97
98 ClassListParser::~ClassListParser() {
99 Atomic::store(&_parsing_thread, (Thread*)nullptr);
100 delete _indy_items;
101 delete _interfaces;
102 _instance = nullptr;
103 }
104
105 void ClassListParser::parse(TRAPS) {
106 for (; !_input_stream.done(); _input_stream.next()) {
107 _line = _input_stream.current_line();
108 clean_up_input_line();
109
110 // Each line in the classlist can be one of three forms:
111 if (_line[0] == '#') {
112 // A comment; ignore it
113 } else if (_line[0] == '@') {
114 // @xxx - a tag like @lambda-proxy, to be parsed by parse_at_tags()
115 parse_at_tags(CHECK);
116 } else {
117 // A class name, followed by optional attributes. E.g.
118 // java/lang/String
119 // java/lang/Object id: 1
120 // my/pkg/TestClass id: 5 super: 1 interfaces: 3 4 source: foo.jar
121 parse_class_name_and_attributes(CHECK);
122 }
123 }
124 }
125
126 void ClassListParser::parse_class_name_and_attributes(TRAPS) {
127 read_class_name_and_attributes();
128
129 if (parse_lambda_forms_invokers_only()) {
130 return;
131 }
132
133 check_class_name(_class_name);
134 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(_class_name);
135 Klass* klass = load_current_class(class_name_symbol, THREAD);
136 if (HAS_PENDING_EXCEPTION) {
137 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
138 // If we have run out of memory, don't try to load the rest of the classes in
139 // the classlist. Throw an exception, which will terminate the dumping process.
140 return; // THROW
141 }
142
143 ResourceMark rm(THREAD);
144 char* ex_msg = (char*)"";
145 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
146 if (message != nullptr) {
147 ex_msg = java_lang_String::as_utf8_string(message);
148 }
149 log_warning(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(), ex_msg);
150 // We might have an invalid class name or an bad class. Warn about it
151 // and keep going to the next line.
152 CLEAR_PENDING_EXCEPTION;
153 log_warning(cds)("Preload Warning: Cannot find %s", _class_name);
154 return;
155 }
156
157 assert(klass != nullptr, "sanity");
158 if (log_is_enabled(Trace, cds)) {
159 ResourceMark rm(THREAD);
160 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
161 }
162
163 if (klass->is_instance_klass()) {
164 InstanceKlass* ik = InstanceKlass::cast(klass);
165
166 // Link the class to cause the bytecodes to be rewritten and the
167 // cpcache to be created. The linking is done as soon as classes
168 // are loaded in order that the related data structures (klass and
169 // cpCache) are located together.
170 MetaspaceShared::try_link_class(THREAD, ik);
171 }
172 }
173
174 void ClassListParser::clean_up_input_line() {
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 void ClassListParser::read_class_name_and_attributes() {
197 _class_name = _line;
198 _id = _unspecified;
199 _super = _unspecified;
200 _interfaces->clear();
201 _source = nullptr;
202 _interfaces_specified = false;
203
204 if ((_token = strchr(_line, ' ')) == nullptr) {
205 // No optional attributes are specified.
206 return;
207 }
208
209 // Mark the end of the name, and go to the next input char
210 *_token++ = '\0';
211
212 while (*_token) {
213 skip_whitespaces();
214
215 if (parse_uint_option("id:", &_id)) {
216 continue;
217 } else if (parse_uint_option("super:", &_super)) {
218 check_already_loaded("Super class", _super);
219 continue;
220 } else if (skip_token("interfaces:")) {
221 int i;
222 while (try_parse_uint(&i)) {
223 check_already_loaded("Interface", i);
224 _interfaces->append(i);
225 }
226 } else if (skip_token("source:")) {
227 skip_whitespaces();
228 _source = _token;
229 char* s = strchr(_token, ' ');
230 if (s == nullptr) {
231 break; // end of input line
232 } else {
233 *s = '\0'; // mark the end of _source
234 _token = s+1;
235 }
236 } else {
237 error("Unknown input");
238 }
239 }
240
241 // if src is specified
242 // id super interfaces must all be specified
243 // loader may be specified
244 // else
245 // # the class is loaded from classpath
246 // id may be specified
247 // super, interfaces, loader must not be specified
248 }
249
250 void ClassListParser::split_tokens_by_whitespace(int offset, GrowableArray<const char*>* items) {
251 int start = offset;
252 int end;
253 bool done = false;
254 while (!done) {
255 while (_line[start] == ' ' || _line[start] == '\t') start++;
256 end = start;
257 while (_line[end] && _line[end] != ' ' && _line[end] != '\t') end++;
258 if (_line[end] == '\0') {
259 done = true;
260 } else {
261 _line[end] = '\0';
262 }
263 items->append(_line + start);
264 start = ++end;
265 }
266 }
267
268 int ClassListParser::split_at_tag_from_line() {
269 _token = _line;
270 char* ptr;
271 if ((ptr = strchr(_line, ' ')) == nullptr) {
272 error("Too few items following the @ tag \"%s\" line #%zu", _line, lineno());
273 return 0;
274 }
275 *ptr++ = '\0';
276 while (*ptr == ' ' || *ptr == '\t') ptr++;
277 return (int)(ptr - _line);
278 }
279
280 void ClassListParser::parse_at_tags(TRAPS) {
281 assert(_line[0] == '@', "must be");
282 int offset = split_at_tag_from_line();
283 assert(offset > 0, "would have exited VM");
284
285 if (strcmp(_token, LAMBDA_PROXY_TAG) == 0) {
286 _indy_items->clear();
287 split_tokens_by_whitespace(offset, _indy_items);
288 if (_indy_items->length() < 2) {
289 error("Line with @ tag has too few items \"%s\" line #%zu", _token, lineno());
290 }
291 if (!parse_lambda_forms_invokers_only()) {
292 _class_name = _indy_items->at(0);
293 check_class_name(_class_name);
294 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(_class_name);
295 if (_indy_items->length() > 0) {
296 // The current line is "@lambda-proxy class_name". Load the proxy class.
297 resolve_indy(THREAD, class_name_symbol);
298 }
299 }
300 } else if (strcmp(_token, LAMBDA_FORM_TAG) == 0) {
301 LambdaFormInvokers::append(os::strdup((const char*)(_line + offset), mtInternal));
302 } else {
303 error("Invalid @ tag at the beginning of line \"%s\" line #%zu", _token, lineno());
304 }
305 }
306
307 void ClassListParser::skip_whitespaces() {
308 while (*_token == ' ' || *_token == '\t') {
309 _token ++;
310 }
311 }
312
313 void ClassListParser::skip_non_whitespaces() {
314 while (*_token && *_token != ' ' && *_token != '\t') {
315 _token ++;
316 }
317 }
318
319 void ClassListParser::parse_int(int* value) {
320 skip_whitespaces();
321 if (sscanf(_token, "%i", value) == 1) {
322 skip_non_whitespaces();
323 } else {
324 error("Error: expected integer");
325 }
326 }
327
328 void ClassListParser::parse_uint(int* value) {
329 parse_int(value);
330 if (*value < 0) {
331 error("Error: negative integers not allowed (%d)", *value);
332 }
333 }
334
335 bool ClassListParser::try_parse_uint(int* value) {
336 skip_whitespaces();
337 if (sscanf(_token, "%i", value) == 1) {
338 skip_non_whitespaces();
339 return true;
340 }
341 return false;
342 }
343
344 bool ClassListParser::skip_token(const char* option_name) {
345 size_t len = strlen(option_name);
346 if (strncmp(_token, option_name, len) == 0) {
347 _token += len;
348 return true;
349 } else {
350 return false;
351 }
352 }
353
354 bool ClassListParser::parse_int_option(const char* option_name, int* value) {
355 if (skip_token(option_name)) {
356 if (*value != _unspecified) {
357 error("%s specified twice", option_name);
358 } else {
359 parse_int(value);
360 return true;
361 }
362 }
363 return false;
364 }
365
366 bool ClassListParser::parse_uint_option(const char* option_name, int* value) {
367 if (skip_token(option_name)) {
368 if (*value != _unspecified) {
369 error("%s specified twice", option_name);
370 } else {
371 parse_uint(value);
372 return true;
373 }
374 }
375 return false;
376 }
377
378 void ClassListParser::print_specified_interfaces() {
379 const int n = _interfaces->length();
380 jio_fprintf(defaultStream::error_stream(), "Currently specified interfaces[%d] = {\n", n);
381 for (int i=0; i<n; i++) {
382 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
383 jio_fprintf(defaultStream::error_stream(), " %4d = %s\n", _interfaces->at(i), k->name()->as_klass_external_name());
384 }
385 jio_fprintf(defaultStream::error_stream(), "}\n");
386 }
387
388 void ClassListParser::print_actual_interfaces(InstanceKlass* ik) {
389 int n = ik->local_interfaces()->length();
390 jio_fprintf(defaultStream::error_stream(), "Actual interfaces[%d] = {\n", n);
391 for (int i = 0; i < n; i++) {
392 InstanceKlass* e = ik->local_interfaces()->at(i);
393 jio_fprintf(defaultStream::error_stream(), " %s\n", e->name()->as_klass_external_name());
394 }
395 jio_fprintf(defaultStream::error_stream(), "}\n");
396 }
397
398 void ClassListParser::error(const char* msg, ...) {
399 va_list ap;
400 va_start(ap, msg);
401 int error_index = pointer_delta_as_int(_token, _line);
402 if (error_index >= _line_len) {
403 error_index = _line_len - 1;
404 }
405 if (error_index < 0) {
406 error_index = 0;
407 }
408
409 jio_fprintf(defaultStream::error_stream(),
410 "An error has occurred while processing class list file %s %zu:%d.\n",
411 _classlist_file, lineno(), (error_index + 1));
412 jio_vfprintf(defaultStream::error_stream(), msg, ap);
413
414 if (_line_len <= 0) {
415 jio_fprintf(defaultStream::error_stream(), "\n");
416 } else {
417 jio_fprintf(defaultStream::error_stream(), ":\n");
418 for (int i=0; i<_line_len; i++) {
419 char c = _line[i];
420 if (c == '\0') {
421 jio_fprintf(defaultStream::error_stream(), "%s", " ");
422 } else {
423 jio_fprintf(defaultStream::error_stream(), "%c", c);
424 }
425 }
426 jio_fprintf(defaultStream::error_stream(), "\n");
427 for (int i=0; i<error_index; i++) {
428 jio_fprintf(defaultStream::error_stream(), "%s", " ");
429 }
430 jio_fprintf(defaultStream::error_stream(), "^\n");
431 }
432 va_end(ap);
433
434 vm_exit_during_initialization("class list format error.", nullptr);
435 }
436
437 void ClassListParser::check_class_name(const char* class_name) {
438 const char* err = nullptr;
439 size_t len = strlen(class_name);
440 if (len > (size_t)Symbol::max_length()) {
441 err = "class name too long";
442 } else {
443 assert(Symbol::max_length() < INT_MAX && len < INT_MAX, "must be");
444 if (!UTF8::is_legal_utf8((const unsigned char*)class_name, (int)len, /*version_leq_47*/false)) {
445 err = "class name is not valid UTF8";
446 }
447 }
448 if (err != nullptr) {
449 jio_fprintf(defaultStream::error_stream(),
450 "An error has occurred while processing class list file %s:%zu %s\n",
451 _classlist_file, lineno(), err);
452 vm_exit_during_initialization("class list format error.", nullptr);
453 }
454 }
455
456 // This function is used for loading classes for customized class loaders
457 // during archive dumping.
458 InstanceKlass* ClassListParser::load_class_from_source(Symbol* class_name, TRAPS) {
459 #if !(defined(_LP64) && (defined(LINUX) || defined(__APPLE__) || defined(_WINDOWS)))
460 // The only supported platforms are: (1) Linux/64-bit and (2) Solaris/64-bit and
461 // (3) MacOSX/64-bit and (4) Windowss/64-bit
462 // This #if condition should be in sync with the areCustomLoadersSupportedForCDS
463 // method in test/lib/jdk/test/lib/Platform.java.
464 error("AppCDS custom class loaders not supported on this platform");
465 #endif
466
467 if (!is_super_specified()) {
468 error("If source location is specified, super class must be also specified");
469 }
470 if (!is_id_specified()) {
471 error("If source location is specified, id must be also specified");
472 }
473 if (strncmp(_class_name, "java/", 5) == 0) {
474 log_info(cds)("Prohibited package for non-bootstrap classes: %s.class from %s",
475 _class_name, _source);
476 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
477 }
478
479 InstanceKlass* k = UnregisteredClasses::load_class(class_name, _source, CHECK_NULL);
480 const int actual_num_interfaces = k->local_interfaces()->length();
481 const int specified_num_interfaces = _interfaces->length(); // specified in classlist
482 int expected_num_interfaces = actual_num_interfaces;
483
484 if (specified_num_interfaces != expected_num_interfaces) {
485 print_specified_interfaces();
486 print_actual_interfaces(k);
487 error("The number of interfaces (%d) specified in class list does not match the class file (%d)",
488 specified_num_interfaces, expected_num_interfaces);
489 }
490
491 assert(k->is_shared_unregistered_class(), "must be");
492
493 bool added = SystemDictionaryShared::add_unregistered_class(THREAD, k);
494 if (!added) {
495 // We allow only a single unregistered class for each unique name.
496 error("Duplicated class %s", _class_name);
497 }
498
499 return k;
500 }
501
502 void ClassListParser::populate_cds_indy_info(const constantPoolHandle &pool, int cp_index, CDSIndyInfo* cii, TRAPS) {
503 // Caller needs to allocate ResourceMark.
504 int type_index = pool->bootstrap_name_and_type_ref_index_at(cp_index);
505 int name_index = pool->name_ref_index_at(type_index);
506 cii->add_item(pool->symbol_at(name_index)->as_C_string());
507 int sig_index = pool->signature_ref_index_at(type_index);
508 cii->add_item(pool->symbol_at(sig_index)->as_C_string());
509 int argc = pool->bootstrap_argument_count_at(cp_index);
510 if (argc > 0) {
511 for (int arg_i = 0; arg_i < argc; arg_i++) {
512 int arg = pool->bootstrap_argument_index_at(cp_index, arg_i);
513 jbyte tag = pool->tag_at(arg).value();
514 if (tag == JVM_CONSTANT_MethodType) {
515 cii->add_item(pool->method_type_signature_at(arg)->as_C_string());
516 } else if (tag == JVM_CONSTANT_MethodHandle) {
517 cii->add_ref_kind(pool->method_handle_ref_kind_at(arg));
518 int callee_index = pool->method_handle_klass_index_at(arg);
519 Klass* callee = pool->klass_at(callee_index, CHECK);
520 cii->add_item(callee->name()->as_C_string());
521 cii->add_item(pool->method_handle_name_ref_at(arg)->as_C_string());
522 cii->add_item(pool->method_handle_signature_ref_at(arg)->as_C_string());
523 } else {
524 ShouldNotReachHere();
525 }
526 }
527 }
528 }
529
530 bool ClassListParser::is_matching_cp_entry(const constantPoolHandle &pool, int cp_index, TRAPS) {
531 ResourceMark rm(THREAD);
532 CDSIndyInfo cii;
533 populate_cds_indy_info(pool, cp_index, &cii, CHECK_0);
534 GrowableArray<const char*>* items = cii.items();
535 int indy_info_offset = 1;
536 if (_indy_items->length() - indy_info_offset != items->length()) {
537 return false;
538 }
539 for (int i = 0; i < items->length(); i++) {
540 if (strcmp(_indy_items->at(i + indy_info_offset), items->at(i)) != 0) {
541 return false;
542 }
543 }
544 return true;
545 }
546
547 void ClassListParser::resolve_indy(JavaThread* current, Symbol* class_name_symbol) {
548 ExceptionMark em(current);
549 JavaThread* THREAD = current; // For exception macros.
550 ClassListParser::resolve_indy_impl(class_name_symbol, THREAD);
551 if (HAS_PENDING_EXCEPTION) {
552 ResourceMark rm(current);
553 char* ex_msg = (char*)"";
554 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
555 if (message != nullptr) {
556 ex_msg = java_lang_String::as_utf8_string(message);
557 }
558 log_warning(cds)("resolve_indy for class %s has encountered exception: %s %s",
559 class_name_symbol->as_C_string(),
560 PENDING_EXCEPTION->klass()->external_name(),
561 ex_msg);
562 CLEAR_PENDING_EXCEPTION;
563 }
564 }
565
566 void ClassListParser::resolve_indy_impl(Symbol* class_name_symbol, TRAPS) {
567 Handle class_loader(THREAD, SystemDictionary::java_system_loader());
568 Handle protection_domain;
569 Klass* klass = SystemDictionary::resolve_or_fail(class_name_symbol, class_loader, protection_domain, true, CHECK);
570 if (klass->is_instance_klass()) {
571 InstanceKlass* ik = InstanceKlass::cast(klass);
572 MetaspaceShared::try_link_class(THREAD, ik);
573 if (!ik->is_linked()) {
574 // Verification of ik has failed
575 return;
576 }
577
578 ConstantPool* cp = ik->constants();
579 ConstantPoolCache* cpcache = cp->cache();
580 bool found = false;
581 for (int indy_index = 0; indy_index < cpcache->resolved_indy_entries_length(); indy_index++) {
582 int pool_index = cpcache->resolved_indy_entry_at(indy_index)->constant_pool_index();
583 constantPoolHandle pool(THREAD, cp);
584 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
585 Handle bsm = bootstrap_specifier.resolve_bsm(CHECK);
586 if (!SystemDictionaryShared::is_supported_invokedynamic(&bootstrap_specifier)) {
587 log_debug(cds, lambda)("is_supported_invokedynamic check failed for cp_index %d", pool_index);
588 continue;
589 }
590 bool matched = is_matching_cp_entry(pool, pool_index, CHECK);
591 if (matched) {
592 found = true;
593 CallInfo info;
594 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(info, CHECK);
595 if (!is_done) {
596 // resolve it
597 Handle recv;
598 LinkResolver::resolve_invoke(info,
599 recv,
600 pool,
601 indy_index,
602 Bytecodes::_invokedynamic, CHECK);
603 break;
604 }
605 cpcache->set_dynamic_call(info, indy_index);
606 }
607 }
608 if (!found) {
609 ResourceMark rm(THREAD);
610 log_warning(cds)("No invoke dynamic constant pool entry can be found for class %s. The classlist is probably out-of-date.",
611 class_name_symbol->as_C_string());
612 }
613 }
614 }
615
616 Klass* ClassListParser::load_current_class(Symbol* class_name_symbol, TRAPS) {
617 Klass* klass;
618 if (!is_loading_from_source()) {
619 // Load classes for the boot/platform/app loaders only.
620 if (is_super_specified()) {
621 error("If source location is not specified, super class must not be specified");
622 }
623 if (are_interfaces_specified()) {
624 error("If source location is not specified, interface(s) must not be specified");
625 }
626
627 if (Signature::is_array(class_name_symbol)) {
628 // array classes are not supported in class list.
629 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
630 }
631
632 JavaValue result(T_OBJECT);
633 // Call java_system_loader().loadClass() directly, which will
634 // delegate to the correct loader (boot, platform or app) depending on
635 // the package name.
636
637 // ClassLoader.loadClass() wants external class name format, i.e., convert '/' chars to '.'
638 Handle ext_class_name = java_lang_String::externalize_classname(class_name_symbol, CHECK_NULL);
639 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
640
641 JavaCalls::call_virtual(&result,
642 loader, //SystemDictionary::java_system_loader(),
643 vmClasses::ClassLoader_klass(),
644 vmSymbols::loadClass_name(),
645 vmSymbols::string_class_signature(),
646 ext_class_name,
647 CHECK_NULL);
648
649 assert(result.get_type() == T_OBJECT, "just checking");
650 oop obj = result.get_oop();
651 assert(obj != nullptr, "jdk.internal.loader.BuiltinClassLoader::loadClass never returns null");
652 klass = java_lang_Class::as_Klass(obj);
653 } else {
654 // If "source:" tag is specified, all super class and super interfaces must be specified in the
655 // class list file.
656 klass = load_class_from_source(class_name_symbol, CHECK_NULL);
657 }
658
659 assert(klass != nullptr, "exception should have been thrown");
660 assert(klass->is_instance_klass(), "array classes should have been filtered out");
661
662 if (is_id_specified()) {
663 InstanceKlass* ik = InstanceKlass::cast(klass);
664 int id = this->id();
665 SystemDictionaryShared::update_shared_entry(ik, id);
666 bool created;
667 id2klass_table()->put_if_absent(id, ik, &created);
668 if (!created) {
669 error("Duplicated ID %d for class %s", id, _class_name);
670 }
671 if (id2klass_table()->maybe_grow()) {
672 log_info(cds, hashtables)("Expanded id2klass_table() to %d", id2klass_table()->table_size());
673 }
674 }
675
676 return klass;
677 }
678
679 bool ClassListParser::is_loading_from_source() {
680 return (_source != nullptr);
681 }
682
683 InstanceKlass* ClassListParser::lookup_class_by_id(int id) {
684 InstanceKlass** klass_ptr = id2klass_table()->get(id);
685 if (klass_ptr == nullptr) {
686 error("Class ID %d has not been defined", id);
687 }
688 assert(*klass_ptr != nullptr, "must be");
689 return *klass_ptr;
690 }
691
692
693 InstanceKlass* ClassListParser::lookup_super_for_current_class(Symbol* super_name) {
694 if (!is_loading_from_source()) {
695 return nullptr;
696 }
697
698 InstanceKlass* k = lookup_class_by_id(super());
699 if (super_name != k->name()) {
700 error("The specified super class %s (id %d) does not match actual super class %s",
701 k->name()->as_klass_external_name(), super(),
702 super_name->as_klass_external_name());
703 }
704 return k;
705 }
706
707 InstanceKlass* ClassListParser::lookup_interface_for_current_class(Symbol* interface_name) {
708 if (!is_loading_from_source()) {
709 return nullptr;
710 }
711
712 const int n = _interfaces->length();
713 if (n == 0) {
714 error("Class %s implements the interface %s, but no interface has been specified in the input line",
715 _class_name, interface_name->as_klass_external_name());
716 ShouldNotReachHere();
717 }
718
719 int i;
720 for (i=0; i<n; i++) {
721 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
722 if (interface_name == k->name()) {
723 return k;
724 }
725 }
726
727 // interface_name is not specified by the "interfaces:" keyword.
728 print_specified_interfaces();
729 error("The interface %s implemented by class %s does not match any of the specified interface IDs",
730 interface_name->as_klass_external_name(), _class_name);
731 ShouldNotReachHere();
732 return nullptr;
733 }