1 /*
2 * Copyright (c) 2015, 2025, 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 "cds/aotConstantPoolResolver.hpp"
26 #include "cds/archiveUtils.hpp"
27 #include "cds/classListParser.hpp"
28 #include "cds/lambdaFormInvokers.hpp"
29 #include "cds/lambdaProxyClassDictionary.hpp"
30 #include "cds/metaspaceShared.hpp"
31 #include "cds/unregisteredClasses.hpp"
32 #include "classfile/classLoaderExt.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/systemDictionaryShared.hpp"
37 #include "classfile/vmClasses.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "interpreter/bytecodeStream.hpp"
41 #include "interpreter/linkResolver.hpp"
42 #include "jimage.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "runtime/atomic.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "utilities/defaultStream.hpp"
55 #include "utilities/macros.hpp"
56 #include "utilities/utf8.hpp"
57
58 const char* ClassListParser::CONSTANT_POOL_TAG = "@cp";
59 const char* ClassListParser::LAMBDA_FORM_TAG = "@lambda-form-invoker";
60 const char* ClassListParser::LAMBDA_PROXY_TAG = "@lambda-proxy";
61
62 volatile Thread* ClassListParser::_parsing_thread = nullptr;
63 ClassListParser* ClassListParser::_instance = nullptr;
64
65 ClassListParser::ClassListParser(const char* file, ParseMode parse_mode) :
66 _classlist_file(file),
67 _id2klass_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
68 _file_input(do_open(file), /* need_close=*/true),
69 _input_stream(&_file_input),
70 _parse_mode(parse_mode) {
71 log_info(cds)("Parsing %s%s", file,
72 parse_lambda_forms_invokers_only() ? " (lambda form invokers only)" : "");
73 if (!_file_input.is_open()) {
74 char reason[JVM_MAXPATHLEN];
75 os::lasterror(reason, JVM_MAXPATHLEN);
76 vm_exit_during_initialization(err_msg("Loading %s %s failed",
77 FLAG_IS_DEFAULT(AOTConfiguration) ?
78 "classlist" : "AOTConfiguration file",
79 file),
80 reason);
81 }
82 _token = _line = nullptr;
83 _interfaces = new (mtClass) GrowableArray<int>(10, mtClass);
84 _indy_items = new (mtClass) GrowableArray<const char*>(9, mtClass);
85
86 // _instance should only be accessed by the thread that created _instance.
87 assert(_instance == nullptr, "must be singleton");
88 _instance = this;
89 Atomic::store(&_parsing_thread, Thread::current());
90 }
91
92 FILE* ClassListParser::do_open(const char* file) {
93 // Use os::open() because neither fopen() nor os::fopen()
94 // can handle long path name on Windows. (See JDK-8216184)
95 int fd = os::open(file, O_RDONLY, S_IREAD);
96 FILE* fp = nullptr;
97 if (fd != -1) {
98 // Obtain a FILE* from the file descriptor so that _input_stream
99 // can be used in ClassListParser::parse()
100 fp = os::fdopen(fd, "r");
101 }
102 return fp;
103 }
104
105 bool ClassListParser::is_parsing_thread() {
106 return Atomic::load(&_parsing_thread) == Thread::current();
107 }
108
109 ClassListParser::~ClassListParser() {
110 Atomic::store(&_parsing_thread, (Thread*)nullptr);
111 delete _indy_items;
112 delete _interfaces;
113 _instance = nullptr;
114 }
115
116 void ClassListParser::parse_classlist(const char* classlist_path, ParseMode parse_mode, TRAPS) {
117 UnregisteredClasses::initialize(CHECK);
118 ClassListParser parser(classlist_path, parse_mode);
119 parser.parse(THREAD);
120 }
121
122 void ClassListParser::parse(TRAPS) {
123 for (; !_input_stream.done(); _input_stream.next()) {
124 _line = _input_stream.current_line();
125 clean_up_input_line();
126
127 // Each line in the classlist can be one of three forms:
128 if (_line[0] == '#') {
129 // A comment; ignore it
130 } else if (_line[0] == '@') {
131 // @xxx - a tag like @lambda-proxy, to be parsed by parse_at_tags()
132 parse_at_tags(CHECK);
133 } else {
134 // A class name, followed by optional attributes. E.g.
135 // java/lang/String
136 // java/lang/Object id: 1
137 // my/pkg/TestClass id: 5 super: 1 interfaces: 3 4 source: foo.jar
138 parse_class_name_and_attributes(CHECK);
139 }
140 }
141 }
142
143 void ClassListParser::parse_class_name_and_attributes(TRAPS) {
144 read_class_name_and_attributes();
145
146 if (parse_lambda_forms_invokers_only()) {
147 return;
148 }
149
150 check_class_name(_class_name);
151 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(_class_name);
152 Klass* klass = load_current_class(class_name_symbol, THREAD);
153 if (HAS_PENDING_EXCEPTION) {
154 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
155 // If we have run out of memory, don't try to load the rest of the classes in
156 // the classlist. Throw an exception, which will terminate the dumping process.
157 return; // THROW
158 }
159
160 ResourceMark rm(THREAD);
161 char* ex_msg = (char*)"";
162 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
163 if (message != nullptr) {
164 ex_msg = java_lang_String::as_utf8_string(message);
165 }
166 log_warning(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(), ex_msg);
167 // We might have an invalid class name or an bad class. Warn about it
168 // and keep going to the next line.
169 CLEAR_PENDING_EXCEPTION;
170 log_warning(cds)("Preload Warning: Cannot find %s", _class_name);
171 return;
172 }
173
174 assert(klass != nullptr, "sanity");
175 if (log_is_enabled(Trace, cds)) {
176 ResourceMark rm(THREAD);
177 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
178 }
179
180 if (klass->is_instance_klass()) {
181 InstanceKlass* ik = InstanceKlass::cast(klass);
182
183 // Link the class to cause the bytecodes to be rewritten and the
184 // cpcache to be created. The linking is done as soon as classes
185 // are loaded in order that the related data structures (klass and
186 // cpCache) are located together.
187 MetaspaceShared::try_link_class(THREAD, ik);
188 }
189 }
190
191 void ClassListParser::clean_up_input_line() {
192 int len = (int)strlen(_line);
193 int i;
194 // Replace \t\r\n\f with ' '
195 for (i=0; i<len; i++) {
196 if (_line[i] == '\t' || _line[i] == '\r' || _line[i] == '\n' || _line[i] == '\f') {
197 _line[i] = ' ';
198 }
199 }
200
201 // Remove trailing newline/space
202 while (len > 0) {
203 if (_line[len-1] == ' ') {
204 _line[len-1] = '\0';
205 len --;
206 } else {
207 break;
208 }
209 }
210 _line_len = len;
211 }
212
213 void ClassListParser::read_class_name_and_attributes() {
214 _class_name = _line;
215 _id = _unspecified;
216 _super = _unspecified;
217 _interfaces->clear();
218 _source = nullptr;
219 _interfaces_specified = false;
220
221 if ((_token = strchr(_line, ' ')) == nullptr) {
222 // No optional attributes are specified.
223 return;
224 }
225
226 // Mark the end of the name, and go to the next input char
227 *_token++ = '\0';
228
229 while (*_token) {
230 skip_whitespaces();
231
232 if (parse_uint_option("id:", &_id)) {
233 continue;
234 } else if (parse_uint_option("super:", &_super)) {
235 check_already_loaded("Super class", _super);
236 continue;
237 } else if (skip_token("interfaces:")) {
238 int i;
239 while (try_parse_uint(&i)) {
240 check_already_loaded("Interface", i);
241 _interfaces->append(i);
242 }
243 } else if (skip_token("source:")) {
244 skip_whitespaces();
245 _source = _token;
246 char* s = strchr(_token, ' ');
247 if (s == nullptr) {
248 break; // end of input line
249 } else {
250 *s = '\0'; // mark the end of _source
251 _token = s+1;
252 }
253 } else {
254 error("Unknown input");
255 }
256 }
257
258 // if src is specified
259 // id super interfaces must all be specified
260 // loader may be specified
261 // else
262 // # the class is loaded from classpath
263 // id may be specified
264 // super, interfaces, loader must not be specified
265 }
266
267 void ClassListParser::split_tokens_by_whitespace(int offset, GrowableArray<const char*>* items) {
268 int start = offset;
269 int end;
270 bool done = false;
271 while (!done) {
272 while (_line[start] == ' ' || _line[start] == '\t') start++;
273 end = start;
274 while (_line[end] && _line[end] != ' ' && _line[end] != '\t') end++;
275 if (_line[end] == '\0') {
276 done = true;
277 } else {
278 _line[end] = '\0';
279 }
280 items->append(_line + start);
281 start = ++end;
282 }
283 }
284
285 int ClassListParser::split_at_tag_from_line() {
286 _token = _line;
287 char* ptr;
288 if ((ptr = strchr(_line, ' ')) == nullptr) {
289 error("Too few items following the @ tag \"%s\" line #%zu", _line, lineno());
290 return 0;
291 }
292 *ptr++ = '\0';
293 while (*ptr == ' ' || *ptr == '\t') ptr++;
294 return (int)(ptr - _line);
295 }
296
297 void ClassListParser::parse_at_tags(TRAPS) {
298 assert(_line[0] == '@', "must be");
299 int offset = split_at_tag_from_line();
300 assert(offset > 0, "would have exited VM");
301
302 if (strcmp(_token, LAMBDA_PROXY_TAG) == 0) {
303 _indy_items->clear();
304 split_tokens_by_whitespace(offset, _indy_items);
305 if (_indy_items->length() < 2) {
306 error("Line with @ tag has too few items \"%s\" line #%zu", _token, lineno());
307 }
308 if (!parse_lambda_forms_invokers_only()) {
309 _class_name = _indy_items->at(0);
310 check_class_name(_class_name);
311 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(_class_name);
312 if (_indy_items->length() > 0) {
313 // The current line is "@lambda-proxy class_name". Load the proxy class.
314 resolve_indy(THREAD, class_name_symbol);
315 }
316 }
317 } else if (strcmp(_token, LAMBDA_FORM_TAG) == 0) {
318 LambdaFormInvokers::append(os::strdup((const char*)(_line + offset), mtInternal));
319 } else if (strcmp(_token, CONSTANT_POOL_TAG) == 0) {
320 _token = _line + offset;
321 parse_constant_pool_tag();
322 } else {
323 error("Invalid @ tag at the beginning of line \"%s\" line #%zu", _token, lineno());
324 }
325 }
326
327 void ClassListParser::skip_whitespaces() {
328 while (*_token == ' ' || *_token == '\t') {
329 _token ++;
330 }
331 }
332
333 void ClassListParser::skip_non_whitespaces() {
334 while (*_token && *_token != ' ' && *_token != '\t') {
335 _token ++;
336 }
337 }
338
339 void ClassListParser::parse_int(int* value) {
340 skip_whitespaces();
341 if (sscanf(_token, "%i", value) == 1) {
342 skip_non_whitespaces();
343 } else {
344 error("Error: expected integer");
345 }
346 }
347
348 void ClassListParser::parse_uint(int* value) {
349 parse_int(value);
350 if (*value < 0) {
351 error("Error: negative integers not allowed (%d)", *value);
352 }
353 }
354
355 bool ClassListParser::try_parse_uint(int* value) {
356 skip_whitespaces();
357 if (sscanf(_token, "%i", value) == 1) {
358 skip_non_whitespaces();
359 return true;
360 }
361 return false;
362 }
363
364 bool ClassListParser::skip_token(const char* option_name) {
365 size_t len = strlen(option_name);
366 if (strncmp(_token, option_name, len) == 0) {
367 _token += len;
368 return true;
369 } else {
370 return false;
371 }
372 }
373
374 bool ClassListParser::parse_int_option(const char* option_name, int* value) {
375 if (skip_token(option_name)) {
376 if (*value != _unspecified) {
377 error("%s specified twice", option_name);
378 } else {
379 parse_int(value);
380 return true;
381 }
382 }
383 return false;
384 }
385
386 bool ClassListParser::parse_uint_option(const char* option_name, int* value) {
387 if (skip_token(option_name)) {
388 if (*value != _unspecified) {
389 error("%s specified twice", option_name);
390 } else {
391 parse_uint(value);
392 return true;
393 }
394 }
395 return false;
396 }
397
398 objArrayOop ClassListParser::get_specified_interfaces(TRAPS) {
399 const int n = _interfaces->length();
400 if (n == 0) {
401 return nullptr;
402 } else {
403 objArrayOop array = oopFactory::new_objArray(vmClasses::Class_klass(), n, CHECK_NULL);
404 for (int i = 0; i < n; i++) {
405 array->obj_at_put(i, lookup_class_by_id(_interfaces->at(i))->java_mirror());
406 }
407 return array;
408 }
409 }
410
411 void ClassListParser::print_specified_interfaces() {
412 const int n = _interfaces->length();
413 jio_fprintf(defaultStream::error_stream(), "Currently specified interfaces[%d] = {\n", n);
414 for (int i=0; i<n; i++) {
415 InstanceKlass* k = lookup_class_by_id(_interfaces->at(i));
416 jio_fprintf(defaultStream::error_stream(), " %4d = %s\n", _interfaces->at(i), k->name()->as_klass_external_name());
417 }
418 jio_fprintf(defaultStream::error_stream(), "}\n");
419 }
420
421 void ClassListParser::print_actual_interfaces(InstanceKlass* ik) {
422 int n = ik->local_interfaces()->length();
423 jio_fprintf(defaultStream::error_stream(), "Actual interfaces[%d] = {\n", n);
424 for (int i = 0; i < n; i++) {
425 InstanceKlass* e = ik->local_interfaces()->at(i);
426 jio_fprintf(defaultStream::error_stream(), " %s\n", e->name()->as_klass_external_name());
427 }
428 jio_fprintf(defaultStream::error_stream(), "}\n");
429 }
430
431 void ClassListParser::print_diagnostic_info(outputStream* st, const char* msg, ...) {
432 va_list ap;
433 va_start(ap, msg);
434 print_diagnostic_info(st, msg, ap);
435 va_end(ap);
436 }
437
438 void ClassListParser::print_diagnostic_info(outputStream* st, const char* msg, va_list ap) {
439 int error_index = pointer_delta_as_int(_token, _line);
440 if (error_index >= _line_len) {
441 error_index = _line_len - 1;
442 }
443 if (error_index < 0) {
444 error_index = 0;
445 }
446
447 st->print("An error has occurred while processing class list file %s %zu:%d.\n",
448 _classlist_file, lineno(), (error_index + 1));
449 st->vprint(msg, ap);
450
451 if (_line_len <= 0) {
452 st->print("\n");
453 } else {
454 st->print(":\n");
455 for (int i=0; i<_line_len; i++) {
456 char c = _line[i];
457 if (c == '\0') {
458 st->print("%s", " ");
459 } else {
460 st->print("%c", c);
461 }
462 }
463 st->print("\n");
464 for (int i=0; i<error_index; i++) {
465 st->print("%s", " ");
466 }
467 st->print("^\n");
468 }
469 }
470
471 void ClassListParser::error(const char* msg, ...) {
472 va_list ap;
473 va_start(ap, msg);
474 fileStream fs(defaultStream::error_stream());
475 //TODO: we should write to UL/error instead, but that requires fixing some tests cases.
476 //LogTarget(Error, cds) lt;
477 //LogStream ls(lt);
478 print_diagnostic_info(&fs, msg, ap);
479 va_end(ap);
480 vm_exit_during_initialization("class list format error.", nullptr);
481 }
482
483 void ClassListParser::check_class_name(const char* class_name) {
484 const char* err = nullptr;
485 size_t len = strlen(class_name);
486 if (len > (size_t)Symbol::max_length()) {
487 err = "class name too long";
488 } else {
489 assert(Symbol::max_length() < INT_MAX && len < INT_MAX, "must be");
490 if (!UTF8::is_legal_utf8((const unsigned char*)class_name, len, /*version_leq_47*/false)) {
491 err = "class name is not valid UTF8";
492 }
493 }
494 if (err != nullptr) {
495 jio_fprintf(defaultStream::error_stream(),
496 "An error has occurred while processing class list file %s:%zu %s\n",
497 _classlist_file, lineno(), err);
498 vm_exit_during_initialization("class list format error.", nullptr);
499 }
500 }
501
502 void ClassListParser::constant_pool_resolution_warning(const char* msg, ...) {
503 va_list ap;
504 va_start(ap, msg);
505 LogTarget(Warning, cds, resolve) lt;
506 LogStream ls(lt);
507 print_diagnostic_info(&ls, msg, ap);
508 ls.print("Your classlist may be out of sync with the JDK or the application.");
509 va_end(ap);
510 }
511
512 // This function is used for loading classes for customized class loaders
513 // during archive dumping.
514 InstanceKlass* ClassListParser::load_class_from_source(Symbol* class_name, TRAPS) {
515 #if !(defined(_LP64) && (defined(LINUX) || defined(__APPLE__) || defined(_WINDOWS)))
516 // The only supported platforms are: (1) Linux/64-bit and (2) Solaris/64-bit and
517 // (3) MacOSX/64-bit and (4) Windowss/64-bit
518 // This #if condition should be in sync with the areCustomLoadersSupportedForCDS
519 // method in test/lib/jdk/test/lib/Platform.java.
520 error("AppCDS custom class loaders not supported on this platform");
521 #endif
522
523 if (!is_super_specified()) {
524 error("If source location is specified, super class must be also specified");
525 }
526 if (!is_id_specified()) {
527 error("If source location is specified, id must be also specified");
528 }
529 if (strncmp(_class_name, "java/", 5) == 0) {
530 log_info(cds)("Prohibited package for non-bootstrap classes: %s.class from %s",
531 _class_name, _source);
532 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
533 }
534
535 ResourceMark rm;
536 char * source_path = os::strdup_check_oom(ClassLoader::uri_to_path(_source));
537 InstanceKlass* specified_super = lookup_class_by_id(_super);
538 Handle super_class(THREAD, specified_super->java_mirror());
539 objArrayOop r = get_specified_interfaces(CHECK_NULL);
540 objArrayHandle interfaces(THREAD, r);
541 InstanceKlass* k = UnregisteredClasses::load_class(class_name, source_path,
542 super_class, interfaces, CHECK_NULL);
543 if (k->java_super() != specified_super) {
544 error("The specified super class %s (id %d) does not match actual super class %s",
545 specified_super->external_name(), _super,
546 k->java_super()->external_name());
547 }
548 const int actual_num_interfaces = k->local_interfaces()->length();
549 const int specified_num_interfaces = _interfaces->length(); // specified in classlist
550 int expected_num_interfaces = actual_num_interfaces;
551
552 if (specified_num_interfaces != expected_num_interfaces) {
553 print_specified_interfaces();
554 print_actual_interfaces(k);
555 error("The number of interfaces (%d) specified in class list does not match the class file (%d)",
556 specified_num_interfaces, expected_num_interfaces);
557 }
558
559 assert(k->is_shared_unregistered_class(), "must be");
560
561 bool added = SystemDictionaryShared::add_unregistered_class(THREAD, k);
562 if (!added) {
563 // We allow only a single unregistered class for each unique name.
564 error("Duplicated class %s", _class_name);
565 }
566
567 return k;
568 }
569
570 void ClassListParser::populate_cds_indy_info(const constantPoolHandle &pool, int cp_index, CDSIndyInfo* cii, TRAPS) {
571 // Caller needs to allocate ResourceMark.
572 int type_index = pool->bootstrap_name_and_type_ref_index_at(cp_index);
573 int name_index = pool->name_ref_index_at(type_index);
574 cii->add_item(pool->symbol_at(name_index)->as_C_string());
575 int sig_index = pool->signature_ref_index_at(type_index);
576 cii->add_item(pool->symbol_at(sig_index)->as_C_string());
577 int argc = pool->bootstrap_argument_count_at(cp_index);
578 if (argc > 0) {
579 for (int arg_i = 0; arg_i < argc; arg_i++) {
580 int arg = pool->bootstrap_argument_index_at(cp_index, arg_i);
581 jbyte tag = pool->tag_at(arg).value();
582 if (tag == JVM_CONSTANT_MethodType) {
583 cii->add_item(pool->method_type_signature_at(arg)->as_C_string());
584 } else if (tag == JVM_CONSTANT_MethodHandle) {
585 cii->add_ref_kind(pool->method_handle_ref_kind_at(arg));
586 int callee_index = pool->method_handle_klass_index_at(arg);
587 Klass* callee = pool->klass_at(callee_index, CHECK);
588 cii->add_item(callee->name()->as_C_string());
589 cii->add_item(pool->method_handle_name_ref_at(arg)->as_C_string());
590 cii->add_item(pool->method_handle_signature_ref_at(arg)->as_C_string());
591 } else {
592 ShouldNotReachHere();
593 }
594 }
595 }
596 }
597
598 bool ClassListParser::is_matching_cp_entry(const constantPoolHandle &pool, int cp_index, TRAPS) {
599 ResourceMark rm(THREAD);
600 CDSIndyInfo cii;
601 populate_cds_indy_info(pool, cp_index, &cii, CHECK_0);
602 GrowableArray<const char*>* items = cii.items();
603 int indy_info_offset = 1;
604 if (_indy_items->length() - indy_info_offset != items->length()) {
605 return false;
606 }
607 for (int i = 0; i < items->length(); i++) {
608 if (strcmp(_indy_items->at(i + indy_info_offset), items->at(i)) != 0) {
609 return false;
610 }
611 }
612 return true;
613 }
614
615 void ClassListParser::resolve_indy(JavaThread* current, Symbol* class_name_symbol) {
616 ExceptionMark em(current);
617 JavaThread* THREAD = current; // For exception macros.
618 ClassListParser::resolve_indy_impl(class_name_symbol, THREAD);
619 if (HAS_PENDING_EXCEPTION) {
620 ResourceMark rm(current);
621 char* ex_msg = (char*)"";
622 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
623 if (message != nullptr) {
624 ex_msg = java_lang_String::as_utf8_string(message);
625 }
626 log_warning(cds)("resolve_indy for class %s has encountered exception: %s %s",
627 class_name_symbol->as_C_string(),
628 PENDING_EXCEPTION->klass()->external_name(),
629 ex_msg);
630 CLEAR_PENDING_EXCEPTION;
631 }
632 }
633
634 void ClassListParser::resolve_indy_impl(Symbol* class_name_symbol, TRAPS) {
635 if (CDSConfig::is_dumping_method_handles()) {
636 // The CP entry for the invokedynamic instruction will be resolved.
637 // No need to do the following.
638 return;
639 }
640
641 // This is an older CDS optimization:
642 // We store a pre-generated version of the lambda proxy class in the AOT cache,
643 // which will be loaded via JVM_LookupLambdaProxyClassFromArchive().
644 // This eliminate dynamic class generation of the proxy class, but we still need to
645 // resolve the CP entry for the invokedynamic instruction, which may result in
646 // generation of LambdaForm classes.
647 Handle class_loader(THREAD, SystemDictionary::java_system_loader());
648 Klass* klass = SystemDictionary::resolve_or_fail(class_name_symbol, class_loader, true, CHECK);
649 if (klass->is_instance_klass()) {
650 InstanceKlass* ik = InstanceKlass::cast(klass);
651 MetaspaceShared::try_link_class(THREAD, ik);
652 if (!ik->is_linked()) {
653 // Verification of ik has failed
654 return;
655 }
656
657 ConstantPool* cp = ik->constants();
658 ConstantPoolCache* cpcache = cp->cache();
659 bool found = false;
660 for (int indy_index = 0; indy_index < cpcache->resolved_indy_entries_length(); indy_index++) {
661 int pool_index = cpcache->resolved_indy_entry_at(indy_index)->constant_pool_index();
662 constantPoolHandle pool(THREAD, cp);
663 BootstrapInfo bootstrap_specifier(pool, pool_index, indy_index);
664 Handle bsm = bootstrap_specifier.resolve_bsm(CHECK);
665 if (!LambdaProxyClassDictionary::is_supported_invokedynamic(&bootstrap_specifier)) {
666 log_debug(cds, lambda)("is_supported_invokedynamic check failed for cp_index %d", pool_index);
667 continue;
668 }
669 bool matched = is_matching_cp_entry(pool, pool_index, CHECK);
670 if (matched) {
671 found = true;
672 CallInfo info;
673 bool is_done = bootstrap_specifier.resolve_previously_linked_invokedynamic(info, CHECK);
674 if (!is_done) {
675 // resolve it
676 Handle recv;
677 LinkResolver::resolve_invoke(info,
678 recv,
679 pool,
680 indy_index,
681 Bytecodes::_invokedynamic, CHECK);
682 break;
683 }
684 cpcache->set_dynamic_call(info, indy_index);
685 }
686 }
687 if (!found) {
688 ResourceMark rm(THREAD);
689 log_warning(cds)("No invoke dynamic constant pool entry can be found for class %s. The classlist is probably out-of-date.",
690 class_name_symbol->as_C_string());
691 }
692 }
693 }
694
695 Klass* ClassListParser::load_current_class(Symbol* class_name_symbol, TRAPS) {
696 Klass* klass;
697 if (!is_loading_from_source()) {
698 // Load classes for the boot/platform/app loaders only.
699 if (is_super_specified()) {
700 error("If source location is not specified, super class must not be specified");
701 }
702 if (are_interfaces_specified()) {
703 error("If source location is not specified, interface(s) must not be specified");
704 }
705
706 if (Signature::is_array(class_name_symbol)) {
707 // array classes are not supported in class list.
708 THROW_NULL(vmSymbols::java_lang_ClassNotFoundException());
709 }
710
711 JavaValue result(T_OBJECT);
712 // Call java_system_loader().loadClass() directly, which will
713 // delegate to the correct loader (boot, platform or app) depending on
714 // the package name.
715
716 // ClassLoader.loadClass() wants external class name format, i.e., convert '/' chars to '.'
717 Handle ext_class_name = java_lang_String::externalize_classname(class_name_symbol, CHECK_NULL);
718 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
719
720 JavaCalls::call_virtual(&result,
721 loader, //SystemDictionary::java_system_loader(),
722 vmClasses::ClassLoader_klass(),
723 vmSymbols::loadClass_name(),
724 vmSymbols::string_class_signature(),
725 ext_class_name,
726 CHECK_NULL);
727
728 assert(result.get_type() == T_OBJECT, "just checking");
729 oop obj = result.get_oop();
730 assert(obj != nullptr, "jdk.internal.loader.BuiltinClassLoader::loadClass never returns null");
731 klass = java_lang_Class::as_Klass(obj);
732 } else {
733 // If "source:" tag is specified, all super class and super interfaces must be specified in the
734 // class list file.
735 klass = load_class_from_source(class_name_symbol, CHECK_NULL);
736 }
737
738 assert(klass != nullptr, "exception should have been thrown");
739 assert(klass->is_instance_klass(), "array classes should have been filtered out");
740
741 if (is_id_specified()) {
742 InstanceKlass* ik = InstanceKlass::cast(klass);
743 int id = this->id();
744 SystemDictionaryShared::update_shared_entry(ik, id);
745 bool created;
746 id2klass_table()->put_if_absent(id, ik, &created);
747 if (!created) {
748 error("Duplicated ID %d for class %s", id, _class_name);
749 }
750 if (id2klass_table()->maybe_grow()) {
751 log_info(cds, hashtables)("Expanded id2klass_table() to %d", id2klass_table()->table_size());
752 }
753 }
754
755 return klass;
756 }
757
758 bool ClassListParser::is_loading_from_source() {
759 return (_source != nullptr);
760 }
761
762 InstanceKlass* ClassListParser::lookup_class_by_id(int id) {
763 InstanceKlass** klass_ptr = id2klass_table()->get(id);
764 if (klass_ptr == nullptr) {
765 error("Class ID %d has not been defined", id);
766 }
767 assert(*klass_ptr != nullptr, "must be");
768 return *klass_ptr;
769 }
770
771 InstanceKlass* ClassListParser::find_builtin_class_helper(JavaThread* current, Symbol* class_name_symbol, oop class_loader_oop) {
772 Handle class_loader(current, class_loader_oop);
773 return SystemDictionary::find_instance_klass(current, class_name_symbol, class_loader);
774 }
775
776 InstanceKlass* ClassListParser::find_builtin_class(JavaThread* current, const char* class_name) {
777 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(class_name);
778 InstanceKlass* ik;
779
780 if ( (ik = find_builtin_class_helper(current, class_name_symbol, nullptr)) != nullptr
781 || (ik = find_builtin_class_helper(current, class_name_symbol, SystemDictionary::java_platform_loader())) != nullptr
782 || (ik = find_builtin_class_helper(current, class_name_symbol, SystemDictionary::java_system_loader())) != nullptr) {
783 return ik;
784 } else {
785 return nullptr;
786 }
787 }
788
789 void ClassListParser::parse_constant_pool_tag() {
790 if (parse_lambda_forms_invokers_only()) {
791 return;
792 }
793
794 JavaThread* THREAD = JavaThread::current();
795 skip_whitespaces();
796 char* class_name = _token;
797 skip_non_whitespaces();
798 *_token = '\0';
799 _token ++;
800
801 InstanceKlass* ik = find_builtin_class(THREAD, class_name);
802 if (ik == nullptr) {
803 _token = class_name;
804 if (strstr(class_name, "/$Proxy") != nullptr ||
805 strstr(class_name, "MethodHandle$Species_") != nullptr) {
806 // ignore -- TODO: we should filter these out in classListWriter.cpp
807 } else {
808 constant_pool_resolution_warning("class %s is not (yet) loaded by one of the built-in loaders", class_name);
809 }
810 return;
811 }
812
813 ResourceMark rm(THREAD);
814 constantPoolHandle cp(THREAD, ik->constants());
815 GrowableArray<bool> preresolve_list(cp->length(), cp->length(), false);
816 bool preresolve_class = false;
817 bool preresolve_fmi = false;
818 bool preresolve_indy = false;
819
820 while (*_token) {
821 int cp_index;
822 skip_whitespaces();
823 parse_uint(&cp_index);
824 if (cp_index < 1 || cp_index >= cp->length()) {
825 constant_pool_resolution_warning("Invalid constant pool index %d", cp_index);
826 return;
827 } else {
828 preresolve_list.at_put(cp_index, true);
829 }
830 constantTag cp_tag = cp->tag_at(cp_index);
831 switch (cp_tag.value()) {
832 case JVM_CONSTANT_UnresolvedClass:
833 preresolve_class = true;
834 break;
835 case JVM_CONSTANT_UnresolvedClassInError:
836 case JVM_CONSTANT_Class:
837 // ignore
838 break;
839 case JVM_CONSTANT_Fieldref:
840 case JVM_CONSTANT_Methodref:
841 case JVM_CONSTANT_InterfaceMethodref:
842 preresolve_fmi = true;
843 break;
844 case JVM_CONSTANT_InvokeDynamic:
845 preresolve_indy = true;
846 break;
847 default:
848 constant_pool_resolution_warning("Unsupported constant pool index %d: %s (type=%d)",
849 cp_index, cp_tag.internal_name(), cp_tag.value());
850 return;
851 }
852 }
853
854 if (SystemDictionaryShared::should_be_excluded(ik)) {
855 if (log_is_enabled(Warning, cds, resolve)) {
856 ResourceMark rm;
857 log_warning(cds, resolve)("Cannot aot-resolve constants for %s because it is excluded", ik->external_name());
858 }
859 return;
860 }
861
862 if (preresolve_class) {
863 AOTConstantPoolResolver::preresolve_class_cp_entries(THREAD, ik, &preresolve_list);
864 }
865 if (preresolve_fmi) {
866 AOTConstantPoolResolver::preresolve_field_and_method_cp_entries(THREAD, ik, &preresolve_list);
867 }
868 if (preresolve_indy) {
869 AOTConstantPoolResolver::preresolve_indy_cp_entries(THREAD, ik, &preresolve_list);
870 }
871 }