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/aotClassInitializer.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/heapShared.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "oops/instanceKlass.inline.hpp"
31 #include "oops/symbol.hpp"
32 #include "runtime/javaCalls.hpp"
33
34 // Detector for class names we wish to handle specially.
35 // It is either an exact string match or a string prefix match.
36 class AOTClassInitializer::AllowedSpec {
37 const char* _class_name;
38 bool _is_prefix;
39 int _len;
40 public:
41 AllowedSpec(const char* class_name, bool is_prefix = false)
42 : _class_name(class_name), _is_prefix(is_prefix)
43 {
44 _len = (class_name == nullptr) ? 0 : (int)strlen(class_name);
45 }
46 const char* class_name() { return _class_name; }
47
48 bool matches(Symbol* name, int len) {
49 assert(_class_name != nullptr, "caller resp.");
50 if (_is_prefix) {
51 return len >= _len && name->starts_with(_class_name);
52 } else {
307 // MethodHandleStatics is an example of a class that must NOT get the aot-init treatment,
308 // because of its strong reliance on (a) final fields which are (b) environmentally determined.
309 //{"java/lang/invoke/InvokerBytecodeGenerator"},
310
311 {nullptr}
312 };
313 if (is_allowed(indy_specs, ik)) {
314 return true;
315 }
316 }
317
318 return false;
319 }
320
321 // TODO: currently we have a hard-coded list. We should turn this into
322 // an annotation: @jdk.internal.vm.annotation.RuntimeSetupRequired
323 // See JDK-8342481.
324 bool AOTClassInitializer::is_runtime_setup_required(InstanceKlass* ik) {
325 return ik == vmClasses::Class_klass() ||
326 ik == vmClasses::internal_Unsafe_klass() ||
327 ik == vmClasses::ConcurrentHashMap_klass();
328 }
329
330 void AOTClassInitializer::call_runtime_setup(JavaThread* current, InstanceKlass* ik) {
331 assert(ik->has_aot_initialized_mirror(), "sanity");
332 if (ik->is_runtime_setup_required()) {
333 if (log_is_enabled(Info, cds, init)) {
334 ResourceMark rm;
335 log_info(cds, init)("Calling %s::runtimeSetup()", ik->external_name());
336 }
337 JavaValue result(T_VOID);
338 JavaCalls::call_static(&result, ik,
339 vmSymbols::runtimeSetup(),
340 vmSymbols::void_method_signature(), current);
341 if (current->has_pending_exception()) {
342 // We cannot continue, as we might have cached instances of ik in the heap, but propagating the
343 // exception would cause ik to be in an error state.
344 AOTLinkedClassBulkLoader::exit_on_exception(current);
345 }
346 }
347 }
|
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/aotClassInitializer.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "dumpTimeClassInfo.inline.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/systemDictionaryShared.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/fieldStreams.inline.hpp"
34 #include "oops/instanceKlass.inline.hpp"
35 #include "oops/symbol.hpp"
36 #include "runtime/fieldDescriptor.inline.hpp"
37 #include "runtime/javaCalls.hpp"
38 #include "runtime/mutexLocker.hpp"
39
40 // Detector for class names we wish to handle specially.
41 // It is either an exact string match or a string prefix match.
42 class AOTClassInitializer::AllowedSpec {
43 const char* _class_name;
44 bool _is_prefix;
45 int _len;
46 public:
47 AllowedSpec(const char* class_name, bool is_prefix = false)
48 : _class_name(class_name), _is_prefix(is_prefix)
49 {
50 _len = (class_name == nullptr) ? 0 : (int)strlen(class_name);
51 }
52 const char* class_name() { return _class_name; }
53
54 bool matches(Symbol* name, int len) {
55 assert(_class_name != nullptr, "caller resp.");
56 if (_is_prefix) {
57 return len >= _len && name->starts_with(_class_name);
58 } else {
313 // MethodHandleStatics is an example of a class that must NOT get the aot-init treatment,
314 // because of its strong reliance on (a) final fields which are (b) environmentally determined.
315 //{"java/lang/invoke/InvokerBytecodeGenerator"},
316
317 {nullptr}
318 };
319 if (is_allowed(indy_specs, ik)) {
320 return true;
321 }
322 }
323
324 return false;
325 }
326
327 // TODO: currently we have a hard-coded list. We should turn this into
328 // an annotation: @jdk.internal.vm.annotation.RuntimeSetupRequired
329 // See JDK-8342481.
330 bool AOTClassInitializer::is_runtime_setup_required(InstanceKlass* ik) {
331 return ik == vmClasses::Class_klass() ||
332 ik == vmClasses::internal_Unsafe_klass() ||
333 ik == vmClasses::ConcurrentHashMap_klass() ||
334 ik == vmClasses::Reference_klass() ||
335 ik->name()->equals("java/net/URI") ||
336 ik->name()->equals("java/lang/module/ModuleDescriptor");
337 }
338
339 void AOTClassInitializer::call_runtime_setup(JavaThread* current, InstanceKlass* ik) {
340 assert(ik->has_aot_initialized_mirror(), "sanity");
341 if (ik->is_runtime_setup_required()) {
342 if (log_is_enabled(Info, cds, init)) {
343 ResourceMark rm;
344 log_info(cds, init)("Calling %s::runtimeSetup()", ik->external_name());
345 }
346 JavaValue result(T_VOID);
347 JavaCalls::call_static(&result, ik,
348 vmSymbols::runtimeSetup(),
349 vmSymbols::void_method_signature(), current);
350 if (current->has_pending_exception()) {
351 // We cannot continue, as we might have cached instances of ik in the heap, but propagating the
352 // exception would cause ik to be in an error state.
353 AOTLinkedClassBulkLoader::exit_on_exception(current);
354 }
355 }
356 }
357
358 // check_can_be_preinited() is quite costly, so we cache the results inside
359 // DumpTimeClassInfo::_can_be_preinited. See also AOTClassInitializer::reset_preinit_check().
360 bool AOTClassInitializer::check_can_be_preinited(InstanceKlass* ik) {
361 ResourceMark rm;
362
363 if (!SystemDictionaryShared::is_builtin(ik)) {
364 log_info(cds, init)("cannot initialize %s (not built-in loader)", ik->external_name());
365 return false;
366 }
367
368 InstanceKlass* super = ik->java_super();
369 if (super != nullptr && !can_be_preinited_locked(super)) {
370 log_info(cds, init)("cannot initialize %s (super %s not initable)", ik->external_name(), super->external_name());
371 return false;
372 }
373
374 Array<InstanceKlass*>* interfaces = ik->local_interfaces();
375 for (int i = 0; i < interfaces->length(); i++) {
376 if (!can_be_preinited_locked(interfaces->at(i))) {
377 log_info(cds, init)("cannot initialize %s (interface %s not initable)",
378 ik->external_name(), interfaces->at(i)->external_name());
379 return false;
380 }
381 }
382
383 if (HeapShared::is_lambda_form_klass(ik)) {
384 // We allow only these to have <clinit> or non-default static fields
385 return true;
386 }
387
388 if (ik->class_initializer() != nullptr) {
389 log_info(cds, init)("cannot initialize %s (has <clinit>)", ik->external_name());
390 return false;
391 }
392 if (ik->is_initialized() && !has_default_static_fields(ik)) {
393 return false;
394 }
395
396 return true;
397 }
398
399 bool AOTClassInitializer::has_default_static_fields(InstanceKlass* ik) {
400 oop mirror = ik->java_mirror();
401
402 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
403 if (fs.access_flags().is_static()) {
404 fieldDescriptor& fd = fs.field_descriptor();
405 int offset = fd.offset();
406 bool is_default = true;
407 bool has_initval = fd.has_initial_value();
408 switch (fd.field_type()) {
409 case T_OBJECT:
410 case T_ARRAY:
411 is_default = mirror->obj_field(offset) == nullptr;
412 break;
413 case T_BOOLEAN:
414 is_default = mirror->bool_field(offset) == (has_initval ? fd.int_initial_value() : 0);
415 break;
416 case T_BYTE:
417 is_default = mirror->byte_field(offset) == (has_initval ? fd.int_initial_value() : 0);
418 break;
419 case T_SHORT:
420 is_default = mirror->short_field(offset) == (has_initval ? fd.int_initial_value() : 0);
421 break;
422 case T_CHAR:
423 is_default = mirror->char_field(offset) == (has_initval ? fd.int_initial_value() : 0);
424 break;
425 case T_INT:
426 is_default = mirror->int_field(offset) == (has_initval ? fd.int_initial_value() : 0);
427 break;
428 case T_LONG:
429 is_default = mirror->long_field(offset) == (has_initval ? fd.long_initial_value() : 0);
430 break;
431 case T_FLOAT:
432 is_default = mirror->float_field(offset) == (has_initval ? fd.float_initial_value() : 0);
433 break;
434 case T_DOUBLE:
435 is_default = mirror->double_field(offset) == (has_initval ? fd.double_initial_value() : 0);
436 break;
437 default:
438 ShouldNotReachHere();
439 }
440
441 if (!is_default) {
442 log_info(cds, init)("cannot initialize %s (static field %s has non-default value)",
443 ik->external_name(), fd.name()->as_C_string());
444 return false;
445 }
446 }
447 }
448
449 return true;
450 }
451
452 bool AOTClassInitializer::can_be_preinited(InstanceKlass* ik) {
453 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
454 return can_be_preinited_locked(ik);
455 }
456
457 bool AOTClassInitializer::can_be_preinited_locked(InstanceKlass* ik) {
458 if (!CDSConfig::is_initing_classes_at_dump_time()) {
459 return false;
460 }
461
462 assert_lock_strong(DumpTimeTable_lock);
463 DumpTimeClassInfo* info = SystemDictionaryShared::get_info_locked(ik);
464 if (!info->has_done_preinit_check()) {
465 info->set_can_be_preinited(AOTClassInitializer::check_can_be_preinited(ik));
466 }
467 return info->can_be_preinited();
468 }
469
470 // Initialize a class at dump time, if possible.
471 void AOTClassInitializer::maybe_preinit_class(InstanceKlass* ik, TRAPS) {
472 #if 0 // FIXME -- leyden+JEP483 merge
473 if (!ik->is_initialized() && AOTClassInitializer::can_be_preinited(ik)) {
474 if (log_is_enabled(Info, cds, init)) {
475 ResourceMark rm;
476 log_info(cds, init)("preinitializing %s", ik->external_name());
477 }
478 ik->initialize(CHECK);
479 }
480 #endif
481 }
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