| /* |
| * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/javaClasses.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/verifier.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "gc_implementation/shared/markSweep.inline.hpp" |
| #include "gc_interface/collectedHeap.inline.hpp" |
| #include "interpreter/oopMapCache.hpp" |
| #include "interpreter/rewriter.hpp" |
| #include "jvmtifiles/jvmti.h" |
| #include "memory/genOopClosures.inline.hpp" |
| #include "memory/oopFactory.hpp" |
| #include "memory/permGen.hpp" |
| #include "oops/fieldStreams.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/instanceMirrorKlass.hpp" |
| #include "oops/instanceOop.hpp" |
| #include "oops/methodOop.hpp" |
| #include "oops/objArrayKlassKlass.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "oops/symbol.hpp" |
| #include "prims/jvmtiExport.hpp" |
| #include "prims/jvmtiRedefineClassesTrace.hpp" |
| #include "runtime/fieldDescriptor.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "services/threadService.hpp" |
| #include "utilities/dtrace.hpp" |
| #ifdef TARGET_OS_FAMILY_linux |
| # include "thread_linux.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_solaris |
| # include "thread_solaris.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_windows |
| # include "thread_windows.inline.hpp" |
| #endif |
| #ifdef TARGET_OS_FAMILY_bsd |
| # include "thread_bsd.inline.hpp" |
| #endif |
| #ifndef SERIALGC |
| #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| #include "gc_implementation/g1/g1RemSet.inline.hpp" |
| #include "gc_implementation/g1/heapRegionSeq.inline.hpp" |
| #include "gc_implementation/parNew/parOopClosures.inline.hpp" |
| #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" |
| #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" |
| #include "oops/oop.pcgc.inline.hpp" |
| #endif |
| #ifdef COMPILER1 |
| #include "c1/c1_Compiler.hpp" |
| #endif |
| |
| #ifdef DTRACE_ENABLED |
| |
| #ifndef USDT2 |
| |
| HS_DTRACE_PROBE_DECL4(hotspot, class__initialization__required, |
| char*, intptr_t, oop, intptr_t); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__recursive, |
| char*, intptr_t, oop, intptr_t, int); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__concurrent, |
| char*, intptr_t, oop, intptr_t, int); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__erroneous, |
| char*, intptr_t, oop, intptr_t, int); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__super__failed, |
| char*, intptr_t, oop, intptr_t, int); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__clinit, |
| char*, intptr_t, oop, intptr_t, int); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__error, |
| char*, intptr_t, oop, intptr_t, int); |
| HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__end, |
| char*, intptr_t, oop, intptr_t, int); |
| |
| #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \ |
| { \ |
| char* data = NULL; \ |
| int len = 0; \ |
| Symbol* name = (clss)->name(); \ |
| if (name != NULL) { \ |
| data = (char*)name->bytes(); \ |
| len = name->utf8_length(); \ |
| } \ |
| HS_DTRACE_PROBE4(hotspot, class__initialization__##type, \ |
| data, len, (clss)->class_loader(), thread_type); \ |
| } |
| |
| #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \ |
| { \ |
| char* data = NULL; \ |
| int len = 0; \ |
| Symbol* name = (clss)->name(); \ |
| if (name != NULL) { \ |
| data = (char*)name->bytes(); \ |
| len = name->utf8_length(); \ |
| } \ |
| HS_DTRACE_PROBE5(hotspot, class__initialization__##type, \ |
| data, len, (clss)->class_loader(), thread_type, wait); \ |
| } |
| #else /* USDT2 */ |
| |
| #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED |
| #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE |
| #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT |
| #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS |
| #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED |
| #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT |
| #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR |
| #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END |
| #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \ |
| { \ |
| char* data = NULL; \ |
| int len = 0; \ |
| Symbol* name = (clss)->name(); \ |
| if (name != NULL) { \ |
| data = (char*)name->bytes(); \ |
| len = name->utf8_length(); \ |
| } \ |
| HOTSPOT_CLASS_INITIALIZATION_##type( \ |
| data, len, (clss)->class_loader(), thread_type); \ |
| } |
| |
| #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \ |
| { \ |
| char* data = NULL; \ |
| int len = 0; \ |
| Symbol* name = (clss)->name(); \ |
| if (name != NULL) { \ |
| data = (char*)name->bytes(); \ |
| len = name->utf8_length(); \ |
| } \ |
| HOTSPOT_CLASS_INITIALIZATION_##type( \ |
| data, len, (clss)->class_loader(), thread_type, wait); \ |
| } |
| #endif /* USDT2 */ |
| |
| #else // ndef DTRACE_ENABLED |
| |
| #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) |
| #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) |
| |
| #endif // ndef DTRACE_ENABLED |
| |
| bool instanceKlass::should_be_initialized() const { |
| return !is_initialized(); |
| } |
| |
| klassVtable* instanceKlass::vtable() const { |
| return new klassVtable(as_klassOop(), start_of_vtable(), vtable_length() / vtableEntry::size()); |
| } |
| |
| klassItable* instanceKlass::itable() const { |
| return new klassItable(as_klassOop()); |
| } |
| |
| void instanceKlass::eager_initialize(Thread *thread) { |
| if (!EagerInitialization) return; |
| |
| if (this->is_not_initialized()) { |
| // abort if the the class has a class initializer |
| if (this->class_initializer() != NULL) return; |
| |
| // abort if it is java.lang.Object (initialization is handled in genesis) |
| klassOop super = this->super(); |
| if (super == NULL) return; |
| |
| // abort if the super class should be initialized |
| if (!instanceKlass::cast(super)->is_initialized()) return; |
| |
| // call body to expose the this pointer |
| instanceKlassHandle this_oop(thread, this->as_klassOop()); |
| eager_initialize_impl(this_oop); |
| } |
| } |
| |
| |
| void instanceKlass::eager_initialize_impl(instanceKlassHandle this_oop) { |
| EXCEPTION_MARK; |
| ObjectLocker ol(this_oop, THREAD); |
| |
| // abort if someone beat us to the initialization |
| if (!this_oop->is_not_initialized()) return; // note: not equivalent to is_initialized() |
| |
| ClassState old_state = this_oop->init_state(); |
| link_class_impl(this_oop, true, THREAD); |
| if (HAS_PENDING_EXCEPTION) { |
| CLEAR_PENDING_EXCEPTION; |
| // Abort if linking the class throws an exception. |
| |
| // Use a test to avoid redundantly resetting the state if there's |
| // no change. Set_init_state() asserts that state changes make |
| // progress, whereas here we might just be spinning in place. |
| if( old_state != this_oop->_init_state ) |
| this_oop->set_init_state (old_state); |
| } else { |
| // linking successfull, mark class as initialized |
| this_oop->set_init_state (fully_initialized); |
| // trace |
| if (TraceClassInitialization) { |
| ResourceMark rm(THREAD); |
| tty->print_cr("[Initialized %s without side effects]", this_oop->external_name()); |
| } |
| } |
| } |
| |
| |
| // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization |
| // process. The step comments refers to the procedure described in that section. |
| // Note: implementation moved to static method to expose the this pointer. |
| void instanceKlass::initialize(TRAPS) { |
| if (this->should_be_initialized()) { |
| HandleMark hm(THREAD); |
| instanceKlassHandle this_oop(THREAD, this->as_klassOop()); |
| initialize_impl(this_oop, CHECK); |
| // Note: at this point the class may be initialized |
| // OR it may be in the state of being initialized |
| // in case of recursive initialization! |
| } else { |
| assert(is_initialized(), "sanity check"); |
| } |
| } |
| |
| |
| bool instanceKlass::verify_code( |
| instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { |
| // 1) Verify the bytecodes |
| Verifier::Mode mode = |
| throw_verifyerror ? Verifier::ThrowException : Verifier::NoException; |
| return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), CHECK_false); |
| } |
| |
| |
| // Used exclusively by the shared spaces dump mechanism to prevent |
| // classes mapped into the shared regions in new VMs from appearing linked. |
| |
| void instanceKlass::unlink_class() { |
| assert(is_linked(), "must be linked"); |
| _init_state = loaded; |
| } |
| |
| void instanceKlass::link_class(TRAPS) { |
| assert(is_loaded(), "must be loaded"); |
| if (!is_linked()) { |
| instanceKlassHandle this_oop(THREAD, this->as_klassOop()); |
| link_class_impl(this_oop, true, CHECK); |
| } |
| } |
| |
| // Called to verify that a class can link during initialization, without |
| // throwing a VerifyError. |
| bool instanceKlass::link_class_or_fail(TRAPS) { |
| assert(is_loaded(), "must be loaded"); |
| if (!is_linked()) { |
| instanceKlassHandle this_oop(THREAD, this->as_klassOop()); |
| link_class_impl(this_oop, false, CHECK_false); |
| } |
| return is_linked(); |
| } |
| |
| bool instanceKlass::link_class_impl( |
| instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { |
| // check for error state |
| if (this_oop->is_in_error_state()) { |
| ResourceMark rm(THREAD); |
| THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(), |
| this_oop->external_name(), false); |
| } |
| // return if already verified |
| if (this_oop->is_linked()) { |
| return true; |
| } |
| |
| // Timing |
| // timer handles recursion |
| assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); |
| JavaThread* jt = (JavaThread*)THREAD; |
| |
| // link super class before linking this class |
| instanceKlassHandle super(THREAD, this_oop->super()); |
| if (super.not_null()) { |
| if (super->is_interface()) { // check if super class is an interface |
| ResourceMark rm(THREAD); |
| Exceptions::fthrow( |
| THREAD_AND_LOCATION, |
| vmSymbols::java_lang_IncompatibleClassChangeError(), |
| "class %s has interface %s as super class", |
| this_oop->external_name(), |
| super->external_name() |
| ); |
| return false; |
| } |
| |
| link_class_impl(super, throw_verifyerror, CHECK_false); |
| } |
| |
| // link all interfaces implemented by this class before linking this class |
| objArrayHandle interfaces (THREAD, this_oop->local_interfaces()); |
| int num_interfaces = interfaces->length(); |
| for (int index = 0; index < num_interfaces; index++) { |
| HandleMark hm(THREAD); |
| instanceKlassHandle ih(THREAD, klassOop(interfaces->obj_at(index))); |
| link_class_impl(ih, throw_verifyerror, CHECK_false); |
| } |
| |
| // in case the class is linked in the process of linking its superclasses |
| if (this_oop->is_linked()) { |
| return true; |
| } |
| |
| // trace only the link time for this klass that includes |
| // the verification time |
| PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), |
| ClassLoader::perf_class_link_selftime(), |
| ClassLoader::perf_classes_linked(), |
| jt->get_thread_stat()->perf_recursion_counts_addr(), |
| jt->get_thread_stat()->perf_timers_addr(), |
| PerfClassTraceTime::CLASS_LINK); |
| |
| // verification & rewriting |
| { |
| ObjectLocker ol(this_oop, THREAD); |
| // rewritten will have been set if loader constraint error found |
| // on an earlier link attempt |
| // don't verify or rewrite if already rewritten |
| if (!this_oop->is_linked()) { |
| if (!this_oop->is_rewritten()) { |
| { |
| // Timer includes any side effects of class verification (resolution, |
| // etc), but not recursive entry into verify_code(). |
| PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(), |
| ClassLoader::perf_class_verify_selftime(), |
| ClassLoader::perf_classes_verified(), |
| jt->get_thread_stat()->perf_recursion_counts_addr(), |
| jt->get_thread_stat()->perf_timers_addr(), |
| PerfClassTraceTime::CLASS_VERIFY); |
| bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD); |
| if (!verify_ok) { |
| return false; |
| } |
| } |
| |
| // Just in case a side-effect of verify linked this class already |
| // (which can sometimes happen since the verifier loads classes |
| // using custom class loaders, which are free to initialize things) |
| if (this_oop->is_linked()) { |
| return true; |
| } |
| |
| // also sets rewritten |
| this_oop->rewrite_class(CHECK_false); |
| } |
| |
| // relocate jsrs and link methods after they are all rewritten |
| this_oop->relocate_and_link_methods(CHECK_false); |
| |
| // Initialize the vtable and interface table after |
| // methods have been rewritten since rewrite may |
| // fabricate new methodOops. |
| // also does loader constraint checking |
| if (!this_oop()->is_shared()) { |
| ResourceMark rm(THREAD); |
| this_oop->vtable()->initialize_vtable(true, CHECK_false); |
| this_oop->itable()->initialize_itable(true, CHECK_false); |
| } |
| #ifdef ASSERT |
| else { |
| ResourceMark rm(THREAD); |
| this_oop->vtable()->verify(tty, true); |
| // In case itable verification is ever added. |
| // this_oop->itable()->verify(tty, true); |
| } |
| #endif |
| this_oop->set_init_state(linked); |
| if (JvmtiExport::should_post_class_prepare()) { |
| Thread *thread = THREAD; |
| assert(thread->is_Java_thread(), "thread->is_Java_thread()"); |
| JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop()); |
| } |
| } |
| } |
| return true; |
| } |
| |
| |
| // Rewrite the byte codes of all of the methods of a class. |
| // The rewriter must be called exactly once. Rewriting must happen after |
| // verification but before the first method of the class is executed. |
| void instanceKlass::rewrite_class(TRAPS) { |
| assert(is_loaded(), "must be loaded"); |
| instanceKlassHandle this_oop(THREAD, this->as_klassOop()); |
| if (this_oop->is_rewritten()) { |
| assert(this_oop()->is_shared(), "rewriting an unshared class?"); |
| return; |
| } |
| Rewriter::rewrite(this_oop, CHECK); |
| this_oop->set_rewritten(); |
| } |
| |
| // Now relocate and link method entry points after class is rewritten. |
| // This is outside is_rewritten flag. In case of an exception, it can be |
| // executed more than once. |
| void instanceKlass::relocate_and_link_methods(TRAPS) { |
| assert(is_loaded(), "must be loaded"); |
| instanceKlassHandle this_oop(THREAD, this->as_klassOop()); |
| Rewriter::relocate_and_link(this_oop, CHECK); |
| } |
| |
| |
| void instanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) { |
| // Make sure klass is linked (verified) before initialization |
| // A class could already be verified, since it has been reflected upon. |
| this_oop->link_class(CHECK); |
| |
| DTRACE_CLASSINIT_PROBE(required, instanceKlass::cast(this_oop()), -1); |
| |
| bool wait = false; |
| |
| // refer to the JVM book page 47 for description of steps |
| // Step 1 |
| { ObjectLocker ol(this_oop, THREAD); |
| |
| Thread *self = THREAD; // it's passed the current thread |
| |
| // Step 2 |
| // If we were to use wait() instead of waitInterruptibly() then |
| // we might end up throwing IE from link/symbol resolution sites |
| // that aren't expected to throw. This would wreak havoc. See 6320309. |
| while(this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(self)) { |
| wait = true; |
| ol.waitUninterruptibly(CHECK); |
| } |
| |
| // Step 3 |
| if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self)) { |
| DTRACE_CLASSINIT_PROBE_WAIT(recursive, instanceKlass::cast(this_oop()), -1,wait); |
| return; |
| } |
| |
| // Step 4 |
| if (this_oop->is_initialized()) { |
| DTRACE_CLASSINIT_PROBE_WAIT(concurrent, instanceKlass::cast(this_oop()), -1,wait); |
| return; |
| } |
| |
| // Step 5 |
| if (this_oop->is_in_error_state()) { |
| DTRACE_CLASSINIT_PROBE_WAIT(erroneous, instanceKlass::cast(this_oop()), -1,wait); |
| ResourceMark rm(THREAD); |
| const char* desc = "Could not initialize class "; |
| const char* className = this_oop->external_name(); |
| size_t msglen = strlen(desc) + strlen(className) + 1; |
| char* message = NEW_RESOURCE_ARRAY(char, msglen); |
| if (NULL == message) { |
| // Out of memory: can't create detailed error message |
| THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); |
| } else { |
| jio_snprintf(message, msglen, "%s%s", desc, className); |
| THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); |
| } |
| } |
| |
| // Step 6 |
| this_oop->set_init_state(being_initialized); |
| this_oop->set_init_thread(self); |
| } |
| |
| // Step 7 |
| klassOop super_klass = this_oop->super(); |
| if (super_klass != NULL && !this_oop->is_interface() && Klass::cast(super_klass)->should_be_initialized()) { |
| Klass::cast(super_klass)->initialize(THREAD); |
| |
| if (HAS_PENDING_EXCEPTION) { |
| Handle e(THREAD, PENDING_EXCEPTION); |
| CLEAR_PENDING_EXCEPTION; |
| { |
| EXCEPTION_MARK; |
| this_oop->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads |
| CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, superclass initialization error is thrown below |
| } |
| DTRACE_CLASSINIT_PROBE_WAIT(super__failed, instanceKlass::cast(this_oop()), -1,wait); |
| THROW_OOP(e()); |
| } |
| } |
| |
| // Step 8 |
| { |
| assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); |
| JavaThread* jt = (JavaThread*)THREAD; |
| DTRACE_CLASSINIT_PROBE_WAIT(clinit, instanceKlass::cast(this_oop()), -1,wait); |
| // Timer includes any side effects of class initialization (resolution, |
| // etc), but not recursive entry into call_class_initializer(). |
| PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), |
| ClassLoader::perf_class_init_selftime(), |
| ClassLoader::perf_classes_inited(), |
| jt->get_thread_stat()->perf_recursion_counts_addr(), |
| jt->get_thread_stat()->perf_timers_addr(), |
| PerfClassTraceTime::CLASS_CLINIT); |
| this_oop->call_class_initializer(THREAD); |
| } |
| |
| // Step 9 |
| if (!HAS_PENDING_EXCEPTION) { |
| this_oop->set_initialization_state_and_notify(fully_initialized, CHECK); |
| { ResourceMark rm(THREAD); |
| debug_only(this_oop->vtable()->verify(tty, true);) |
| } |
| } |
| else { |
| // Step 10 and 11 |
| Handle e(THREAD, PENDING_EXCEPTION); |
| CLEAR_PENDING_EXCEPTION; |
| { |
| EXCEPTION_MARK; |
| this_oop->set_initialization_state_and_notify(initialization_error, THREAD); |
| CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below |
| } |
| DTRACE_CLASSINIT_PROBE_WAIT(error, instanceKlass::cast(this_oop()), -1,wait); |
| if (e->is_a(SystemDictionary::Error_klass())) { |
| THROW_OOP(e()); |
| } else { |
| JavaCallArguments args(e); |
| THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), |
| vmSymbols::throwable_void_signature(), |
| &args); |
| } |
| } |
| DTRACE_CLASSINIT_PROBE_WAIT(end, instanceKlass::cast(this_oop()), -1,wait); |
| } |
| |
| |
| // Note: implementation moved to static method to expose the this pointer. |
| void instanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { |
| instanceKlassHandle kh(THREAD, this->as_klassOop()); |
| set_initialization_state_and_notify_impl(kh, state, CHECK); |
| } |
| |
| void instanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_oop, ClassState state, TRAPS) { |
| ObjectLocker ol(this_oop, THREAD); |
| this_oop->set_init_state(state); |
| ol.notify_all(CHECK); |
| } |
| |
| void instanceKlass::add_implementor(klassOop k) { |
| assert(Compile_lock->owned_by_self(), ""); |
| // Filter out my subinterfaces. |
| // (Note: Interfaces are never on the subklass list.) |
| if (instanceKlass::cast(k)->is_interface()) return; |
| |
| // Filter out subclasses whose supers already implement me. |
| // (Note: CHA must walk subclasses of direct implementors |
| // in order to locate indirect implementors.) |
| klassOop sk = instanceKlass::cast(k)->super(); |
| if (sk != NULL && instanceKlass::cast(sk)->implements_interface(as_klassOop())) |
| // We only need to check one immediate superclass, since the |
| // implements_interface query looks at transitive_interfaces. |
| // Any supers of the super have the same (or fewer) transitive_interfaces. |
| return; |
| |
| // Update number of implementors |
| int i = _nof_implementors++; |
| |
| // Record this implementor, if there are not too many already |
| if (i < implementors_limit) { |
| assert(_implementors[i] == NULL, "should be exactly one implementor"); |
| oop_store_without_check((oop*)&_implementors[i], k); |
| } else if (i == implementors_limit) { |
| // clear out the list on first overflow |
| for (int i2 = 0; i2 < implementors_limit; i2++) |
| oop_store_without_check((oop*)&_implementors[i2], NULL); |
| } |
| |
| // The implementor also implements the transitive_interfaces |
| for (int index = 0; index < local_interfaces()->length(); index++) { |
| instanceKlass::cast(klassOop(local_interfaces()->obj_at(index)))->add_implementor(k); |
| } |
| } |
| |
| void instanceKlass::init_implementor() { |
| for (int i = 0; i < implementors_limit; i++) |
| oop_store_without_check((oop*)&_implementors[i], NULL); |
| _nof_implementors = 0; |
| } |
| |
| |
| void instanceKlass::process_interfaces(Thread *thread) { |
| // link this class into the implementors list of every interface it implements |
| KlassHandle this_as_oop (thread, this->as_klassOop()); |
| for (int i = local_interfaces()->length() - 1; i >= 0; i--) { |
| assert(local_interfaces()->obj_at(i)->is_klass(), "must be a klass"); |
| instanceKlass* interf = instanceKlass::cast(klassOop(local_interfaces()->obj_at(i))); |
| assert(interf->is_interface(), "expected interface"); |
| interf->add_implementor(this_as_oop()); |
| } |
| } |
| |
| bool instanceKlass::can_be_primary_super_slow() const { |
| if (is_interface()) |
| return false; |
| else |
| return Klass::can_be_primary_super_slow(); |
| } |
| |
| objArrayOop instanceKlass::compute_secondary_supers(int num_extra_slots, TRAPS) { |
| // The secondaries are the implemented interfaces. |
| instanceKlass* ik = instanceKlass::cast(as_klassOop()); |
| objArrayHandle interfaces (THREAD, ik->transitive_interfaces()); |
| int num_secondaries = num_extra_slots + interfaces->length(); |
| if (num_secondaries == 0) { |
| return Universe::the_empty_system_obj_array(); |
| } else if (num_extra_slots == 0) { |
| return interfaces(); |
| } else { |
| // a mix of both |
| objArrayOop secondaries = oopFactory::new_system_objArray(num_secondaries, CHECK_NULL); |
| for (int i = 0; i < interfaces->length(); i++) { |
| secondaries->obj_at_put(num_extra_slots+i, interfaces->obj_at(i)); |
| } |
| return secondaries; |
| } |
| } |
| |
| bool instanceKlass::compute_is_subtype_of(klassOop k) { |
| if (Klass::cast(k)->is_interface()) { |
| return implements_interface(k); |
| } else { |
| return Klass::compute_is_subtype_of(k); |
| } |
| } |
| |
| bool instanceKlass::implements_interface(klassOop k) const { |
| if (as_klassOop() == k) return true; |
| assert(Klass::cast(k)->is_interface(), "should be an interface class"); |
| for (int i = 0; i < transitive_interfaces()->length(); i++) { |
| if (transitive_interfaces()->obj_at(i) == k) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| objArrayOop instanceKlass::allocate_objArray(int n, int length, TRAPS) { |
| if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); |
| if (length > arrayOopDesc::max_array_length(T_OBJECT)) { |
| report_java_out_of_memory("Requested array size exceeds VM limit"); |
| THROW_OOP_0(Universe::out_of_memory_error_array_size()); |
| } |
| int size = objArrayOopDesc::object_size(length); |
| klassOop ak = array_klass(n, CHECK_NULL); |
| KlassHandle h_ak (THREAD, ak); |
| objArrayOop o = |
| (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL); |
| return o; |
| } |
| |
| instanceOop instanceKlass::register_finalizer(instanceOop i, TRAPS) { |
| if (TraceFinalizerRegistration) { |
| tty->print("Registered "); |
| i->print_value_on(tty); |
| tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", (address)i); |
| } |
| instanceHandle h_i(THREAD, i); |
| // Pass the handle as argument, JavaCalls::call expects oop as jobjects |
| JavaValue result(T_VOID); |
| JavaCallArguments args(h_i); |
| methodHandle mh (THREAD, Universe::finalizer_register_method()); |
| JavaCalls::call(&result, mh, &args, CHECK_NULL); |
| return h_i(); |
| } |
| |
| instanceOop instanceKlass::allocate_instance(TRAPS) { |
| assert(!oop_is_instanceMirror(), "wrong allocation path"); |
| bool has_finalizer_flag = has_finalizer(); // Query before possible GC |
| int size = size_helper(); // Query before forming handle. |
| |
| KlassHandle h_k(THREAD, as_klassOop()); |
| |
| instanceOop i; |
| |
| i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL); |
| if (has_finalizer_flag && !RegisterFinalizersAtInit) { |
| i = register_finalizer(i, CHECK_NULL); |
| } |
| return i; |
| } |
| |
| instanceOop instanceKlass::allocate_permanent_instance(TRAPS) { |
| // Finalizer registration occurs in the Object.<init> constructor |
| // and constructors normally aren't run when allocating perm |
| // instances so simply disallow finalizable perm objects. This can |
| // be relaxed if a need for it is found. |
| assert(!has_finalizer(), "perm objects not allowed to have finalizers"); |
| assert(!oop_is_instanceMirror(), "wrong allocation path"); |
| int size = size_helper(); // Query before forming handle. |
| KlassHandle h_k(THREAD, as_klassOop()); |
| instanceOop i = (instanceOop) |
| CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); |
| return i; |
| } |
| |
| void instanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { |
| if (is_interface() || is_abstract()) { |
| ResourceMark rm(THREAD); |
| THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() |
| : vmSymbols::java_lang_InstantiationException(), external_name()); |
| } |
| if (as_klassOop() == SystemDictionary::Class_klass()) { |
| ResourceMark rm(THREAD); |
| THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() |
| : vmSymbols::java_lang_IllegalAccessException(), external_name()); |
| } |
| } |
| |
| klassOop instanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { |
| instanceKlassHandle this_oop(THREAD, as_klassOop()); |
| return array_klass_impl(this_oop, or_null, n, THREAD); |
| } |
| |
| klassOop instanceKlass::array_klass_impl(instanceKlassHandle this_oop, bool or_null, int n, TRAPS) { |
| if (this_oop->array_klasses() == NULL) { |
| if (or_null) return NULL; |
| |
| ResourceMark rm; |
| JavaThread *jt = (JavaThread *)THREAD; |
| { |
| // Atomic creation of array_klasses |
| MutexLocker mc(Compile_lock, THREAD); // for vtables |
| MutexLocker ma(MultiArray_lock, THREAD); |
| |
| // Check if update has already taken place |
| if (this_oop->array_klasses() == NULL) { |
| objArrayKlassKlass* oakk = |
| (objArrayKlassKlass*)Universe::objArrayKlassKlassObj()->klass_part(); |
| |
| klassOop k = oakk->allocate_objArray_klass(1, this_oop, CHECK_NULL); |
| this_oop->set_array_klasses(k); |
| } |
| } |
| } |
| // _this will always be set at this point |
| objArrayKlass* oak = (objArrayKlass*)this_oop->array_klasses()->klass_part(); |
| if (or_null) { |
| return oak->array_klass_or_null(n); |
| } |
| return oak->array_klass(n, CHECK_NULL); |
| } |
| |
| klassOop instanceKlass::array_klass_impl(bool or_null, TRAPS) { |
| return array_klass_impl(or_null, 1, THREAD); |
| } |
| |
| void instanceKlass::call_class_initializer(TRAPS) { |
| instanceKlassHandle ik (THREAD, as_klassOop()); |
| call_class_initializer_impl(ik, THREAD); |
| } |
| |
| static int call_class_initializer_impl_counter = 0; // for debugging |
| |
| methodOop instanceKlass::class_initializer() { |
| methodOop clinit = find_method( |
| vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); |
| if (clinit != NULL && clinit->has_valid_initializer_flags()) { |
| return clinit; |
| } |
| return NULL; |
| } |
| |
| void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) { |
| methodHandle h_method(THREAD, this_oop->class_initializer()); |
| assert(!this_oop->is_initialized(), "we cannot initialize twice"); |
| if (TraceClassInitialization) { |
| tty->print("%d Initializing ", call_class_initializer_impl_counter++); |
| this_oop->name()->print_value(); |
| tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", (address)this_oop()); |
| } |
| if (h_method() != NULL) { |
| JavaCallArguments args; // No arguments |
| JavaValue result(T_VOID); |
| JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) |
| } |
| } |
| |
| |
| void instanceKlass::mask_for(methodHandle method, int bci, |
| InterpreterOopMap* entry_for) { |
| // Dirty read, then double-check under a lock. |
| if (_oop_map_cache == NULL) { |
| // Otherwise, allocate a new one. |
| MutexLocker x(OopMapCacheAlloc_lock); |
| // First time use. Allocate a cache in C heap |
| if (_oop_map_cache == NULL) { |
| _oop_map_cache = new OopMapCache(); |
| } |
| } |
| // _oop_map_cache is constant after init; lookup below does is own locking. |
| _oop_map_cache->lookup(method, bci, entry_for); |
| } |
| |
| |
| bool instanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| for (JavaFieldStream fs(as_klassOop()); !fs.done(); fs.next()) { |
| Symbol* f_name = fs.name(); |
| Symbol* f_sig = fs.signature(); |
| if (f_name == name && f_sig == sig) { |
| fd->initialize(as_klassOop(), fs.index()); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| void instanceKlass::shared_symbols_iterate(SymbolClosure* closure) { |
| Klass::shared_symbols_iterate(closure); |
| closure->do_symbol(&_generic_signature); |
| closure->do_symbol(&_source_file_name); |
| closure->do_symbol(&_source_debug_extension); |
| |
| for (JavaFieldStream fs(this); !fs.done(); fs.next()) { |
| int name_index = fs.name_index(); |
| closure->do_symbol(constants()->symbol_at_addr(name_index)); |
| int sig_index = fs.signature_index(); |
| closure->do_symbol(constants()->symbol_at_addr(sig_index)); |
| } |
| } |
| |
| |
| klassOop instanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| const int n = local_interfaces()->length(); |
| for (int i = 0; i < n; i++) { |
| klassOop intf1 = klassOop(local_interfaces()->obj_at(i)); |
| assert(Klass::cast(intf1)->is_interface(), "just checking type"); |
| // search for field in current interface |
| if (instanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { |
| assert(fd->is_static(), "interface field must be static"); |
| return intf1; |
| } |
| // search for field in direct superinterfaces |
| klassOop intf2 = instanceKlass::cast(intf1)->find_interface_field(name, sig, fd); |
| if (intf2 != NULL) return intf2; |
| } |
| // otherwise field lookup fails |
| return NULL; |
| } |
| |
| |
| klassOop instanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| // search order according to newest JVM spec (5.4.3.2, p.167). |
| // 1) search for field in current klass |
| if (find_local_field(name, sig, fd)) { |
| return as_klassOop(); |
| } |
| // 2) search for field recursively in direct superinterfaces |
| { klassOop intf = find_interface_field(name, sig, fd); |
| if (intf != NULL) return intf; |
| } |
| // 3) apply field lookup recursively if superclass exists |
| { klassOop supr = super(); |
| if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, fd); |
| } |
| // 4) otherwise field lookup fails |
| return NULL; |
| } |
| |
| |
| klassOop instanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { |
| // search order according to newest JVM spec (5.4.3.2, p.167). |
| // 1) search for field in current klass |
| if (find_local_field(name, sig, fd)) { |
| if (fd->is_static() == is_static) return as_klassOop(); |
| } |
| // 2) search for field recursively in direct superinterfaces |
| if (is_static) { |
| klassOop intf = find_interface_field(name, sig, fd); |
| if (intf != NULL) return intf; |
| } |
| // 3) apply field lookup recursively if superclass exists |
| { klassOop supr = super(); |
| if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, is_static, fd); |
| } |
| // 4) otherwise field lookup fails |
| return NULL; |
| } |
| |
| |
| bool instanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { |
| for (JavaFieldStream fs(as_klassOop()); !fs.done(); fs.next()) { |
| if (fs.offset() == offset) { |
| fd->initialize(as_klassOop(), fs.index()); |
| if (fd->is_static() == is_static) return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| bool instanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { |
| klassOop klass = as_klassOop(); |
| while (klass != NULL) { |
| if (instanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { |
| return true; |
| } |
| klass = Klass::cast(klass)->super(); |
| } |
| return false; |
| } |
| |
| |
| void instanceKlass::methods_do(void f(methodOop method)) { |
| int len = methods()->length(); |
| for (int index = 0; index < len; index++) { |
| methodOop m = methodOop(methods()->obj_at(index)); |
| assert(m->is_method(), "must be method"); |
| f(m); |
| } |
| } |
| |
| |
| void instanceKlass::do_local_static_fields(FieldClosure* cl) { |
| for (JavaFieldStream fs(this); !fs.done(); fs.next()) { |
| if (fs.access_flags().is_static()) { |
| fieldDescriptor fd; |
| fd.initialize(as_klassOop(), fs.index()); |
| cl->do_field(&fd); |
| } |
| } |
| } |
| |
| |
| void instanceKlass::do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS) { |
| instanceKlassHandle h_this(THREAD, as_klassOop()); |
| do_local_static_fields_impl(h_this, f, CHECK); |
| } |
| |
| |
| void instanceKlass::do_local_static_fields_impl(instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS) { |
| for (JavaFieldStream fs(this_oop()); !fs.done(); fs.next()) { |
| if (fs.access_flags().is_static()) { |
| fieldDescriptor fd; |
| fd.initialize(this_oop(), fs.index()); |
| f(&fd, CHECK); |
| } |
| } |
| } |
| |
| |
| static int compare_fields_by_offset(int* a, int* b) { |
| return a[0] - b[0]; |
| } |
| |
| void instanceKlass::do_nonstatic_fields(FieldClosure* cl) { |
| instanceKlass* super = superklass(); |
| if (super != NULL) { |
| super->do_nonstatic_fields(cl); |
| } |
| fieldDescriptor fd; |
| int length = java_fields_count(); |
| // In DebugInfo nonstatic fields are sorted by offset. |
| int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1)); |
| int j = 0; |
| for (int i = 0; i < length; i += 1) { |
| fd.initialize(as_klassOop(), i); |
| if (!fd.is_static()) { |
| fields_sorted[j + 0] = fd.offset(); |
| fields_sorted[j + 1] = i; |
| j += 2; |
| } |
| } |
| if (j > 0) { |
| length = j; |
| // _sort_Fn is defined in growableArray.hpp. |
| qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); |
| for (int i = 0; i < length; i += 2) { |
| fd.initialize(as_klassOop(), fields_sorted[i + 1]); |
| assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); |
| cl->do_field(&fd); |
| } |
| } |
| FREE_C_HEAP_ARRAY(int, fields_sorted); |
| } |
| |
| |
| void instanceKlass::array_klasses_do(void f(klassOop k)) { |
| if (array_klasses() != NULL) |
| arrayKlass::cast(array_klasses())->array_klasses_do(f); |
| } |
| |
| |
| void instanceKlass::with_array_klasses_do(void f(klassOop k)) { |
| f(as_klassOop()); |
| array_klasses_do(f); |
| } |
| |
| #ifdef ASSERT |
| static int linear_search(objArrayOop methods, Symbol* name, Symbol* signature) { |
| int len = methods->length(); |
| for (int index = 0; index < len; index++) { |
| methodOop m = (methodOop)(methods->obj_at(index)); |
| assert(m->is_method(), "must be method"); |
| if (m->signature() == signature && m->name() == name) { |
| return index; |
| } |
| } |
| return -1; |
| } |
| #endif |
| |
| methodOop instanceKlass::find_method(Symbol* name, Symbol* signature) const { |
| return instanceKlass::find_method(methods(), name, signature); |
| } |
| |
| methodOop instanceKlass::find_method(objArrayOop methods, Symbol* name, Symbol* signature) { |
| int len = methods->length(); |
| // methods are sorted, so do binary search |
| int l = 0; |
| int h = len - 1; |
| while (l <= h) { |
| int mid = (l + h) >> 1; |
| methodOop m = (methodOop)methods->obj_at(mid); |
| assert(m->is_method(), "must be method"); |
| int res = m->name()->fast_compare(name); |
| if (res == 0) { |
| // found matching name; do linear search to find matching signature |
| // first, quick check for common case |
| if (m->signature() == signature) return m; |
| // search downwards through overloaded methods |
| int i; |
| for (i = mid - 1; i >= l; i--) { |
| methodOop m = (methodOop)methods->obj_at(i); |
| assert(m->is_method(), "must be method"); |
| if (m->name() != name) break; |
| if (m->signature() == signature) return m; |
| } |
| // search upwards |
| for (i = mid + 1; i <= h; i++) { |
| methodOop m = (methodOop)methods->obj_at(i); |
| assert(m->is_method(), "must be method"); |
| if (m->name() != name) break; |
| if (m->signature() == signature) return m; |
| } |
| // not found |
| #ifdef ASSERT |
| int index = linear_search(methods, name, signature); |
| assert(index == -1, err_msg("binary search should have found entry %d", index)); |
| #endif |
| return NULL; |
| } else if (res < 0) { |
| l = mid + 1; |
| } else { |
| h = mid - 1; |
| } |
| } |
| #ifdef ASSERT |
| int index = linear_search(methods, name, signature); |
| assert(index == -1, err_msg("binary search should have found entry %d", index)); |
| #endif |
| return NULL; |
| } |
| |
| methodOop instanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature) const { |
| klassOop klass = as_klassOop(); |
| while (klass != NULL) { |
| methodOop method = instanceKlass::cast(klass)->find_method(name, signature); |
| if (method != NULL) return method; |
| klass = instanceKlass::cast(klass)->super(); |
| } |
| return NULL; |
| } |
| |
| // lookup a method in all the interfaces that this class implements |
| methodOop instanceKlass::lookup_method_in_all_interfaces(Symbol* name, |
| Symbol* signature) const { |
| objArrayOop all_ifs = instanceKlass::cast(as_klassOop())->transitive_interfaces(); |
| int num_ifs = all_ifs->length(); |
| instanceKlass *ik = NULL; |
| for (int i = 0; i < num_ifs; i++) { |
| ik = instanceKlass::cast(klassOop(all_ifs->obj_at(i))); |
| methodOop m = ik->lookup_method(name, signature); |
| if (m != NULL) { |
| return m; |
| } |
| } |
| return NULL; |
| } |
| |
| /* jni_id_for_impl for jfieldIds only */ |
| JNIid* instanceKlass::jni_id_for_impl(instanceKlassHandle this_oop, int offset) { |
| MutexLocker ml(JfieldIdCreation_lock); |
| // Retry lookup after we got the lock |
| JNIid* probe = this_oop->jni_ids() == NULL ? NULL : this_oop->jni_ids()->find(offset); |
| if (probe == NULL) { |
| // Slow case, allocate new static field identifier |
| probe = new JNIid(this_oop->as_klassOop(), offset, this_oop->jni_ids()); |
| this_oop->set_jni_ids(probe); |
| } |
| return probe; |
| } |
| |
| |
| /* jni_id_for for jfieldIds only */ |
| JNIid* instanceKlass::jni_id_for(int offset) { |
| JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); |
| if (probe == NULL) { |
| probe = jni_id_for_impl(this->as_klassOop(), offset); |
| } |
| return probe; |
| } |
| |
| u2 instanceKlass::enclosing_method_data(int offset) { |
| typeArrayOop inner_class_list = inner_classes(); |
| if (inner_class_list == NULL) { |
| return 0; |
| } |
| int length = inner_class_list->length(); |
| if (length % inner_class_next_offset == 0) { |
| return 0; |
| } else { |
| int index = length - enclosing_method_attribute_size; |
| typeArrayHandle inner_class_list_h(inner_class_list); |
| assert(offset < enclosing_method_attribute_size, "invalid offset"); |
| return inner_class_list_h->ushort_at(index + offset); |
| } |
| } |
| |
| void instanceKlass::set_enclosing_method_indices(u2 class_index, |
| u2 method_index) { |
| typeArrayOop inner_class_list = inner_classes(); |
| assert (inner_class_list != NULL, "_inner_classes list is not set up"); |
| int length = inner_class_list->length(); |
| if (length % inner_class_next_offset == enclosing_method_attribute_size) { |
| int index = length - enclosing_method_attribute_size; |
| typeArrayHandle inner_class_list_h(inner_class_list); |
| inner_class_list_h->ushort_at_put( |
| index + enclosing_method_class_index_offset, class_index); |
| inner_class_list_h->ushort_at_put( |
| index + enclosing_method_method_index_offset, method_index); |
| } |
| } |
| |
| // Lookup or create a jmethodID. |
| // This code is called by the VMThread and JavaThreads so the |
| // locking has to be done very carefully to avoid deadlocks |
| // and/or other cache consistency problems. |
| // |
| jmethodID instanceKlass::get_jmethod_id(instanceKlassHandle ik_h, methodHandle method_h) { |
| size_t idnum = (size_t)method_h->method_idnum(); |
| jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); |
| size_t length = 0; |
| jmethodID id = NULL; |
| |
| // We use a double-check locking idiom here because this cache is |
| // performance sensitive. In the normal system, this cache only |
| // transitions from NULL to non-NULL which is safe because we use |
| // release_set_methods_jmethod_ids() to advertise the new cache. |
| // A partially constructed cache should never be seen by a racing |
| // thread. We also use release_store_ptr() to save a new jmethodID |
| // in the cache so a partially constructed jmethodID should never be |
| // seen either. Cache reads of existing jmethodIDs proceed without a |
| // lock, but cache writes of a new jmethodID requires uniqueness and |
| // creation of the cache itself requires no leaks so a lock is |
| // generally acquired in those two cases. |
| // |
| // If the RedefineClasses() API has been used, then this cache can |
| // grow and we'll have transitions from non-NULL to bigger non-NULL. |
| // Cache creation requires no leaks and we require safety between all |
| // cache accesses and freeing of the old cache so a lock is generally |
| // acquired when the RedefineClasses() API has been used. |
| |
| if (jmeths != NULL) { |
| // the cache already exists |
| if (!ik_h->idnum_can_increment()) { |
| // the cache can't grow so we can just get the current values |
| get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
| } else { |
| // cache can grow so we have to be more careful |
| if (Threads::number_of_threads() == 0 || |
| SafepointSynchronize::is_at_safepoint()) { |
| // we're single threaded or at a safepoint - no locking needed |
| get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
| } else { |
| MutexLocker ml(JmethodIdCreation_lock); |
| get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
| } |
| } |
| } |
| // implied else: |
| // we need to allocate a cache so default length and id values are good |
| |
| if (jmeths == NULL || // no cache yet |
| length <= idnum || // cache is too short |
| id == NULL) { // cache doesn't contain entry |
| |
| // This function can be called by the VMThread so we have to do all |
| // things that might block on a safepoint before grabbing the lock. |
| // Otherwise, we can deadlock with the VMThread or have a cache |
| // consistency issue. These vars keep track of what we might have |
| // to free after the lock is dropped. |
| jmethodID to_dealloc_id = NULL; |
| jmethodID* to_dealloc_jmeths = NULL; |
| |
| // may not allocate new_jmeths or use it if we allocate it |
| jmethodID* new_jmeths = NULL; |
| if (length <= idnum) { |
| // allocate a new cache that might be used |
| size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count()); |
| new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1); |
| memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); |
| // cache size is stored in element[0], other elements offset by one |
| new_jmeths[0] = (jmethodID)size; |
| } |
| |
| // allocate a new jmethodID that might be used |
| jmethodID new_id = NULL; |
| if (method_h->is_old() && !method_h->is_obsolete()) { |
| // The method passed in is old (but not obsolete), we need to use the current version |
| methodOop current_method = ik_h->method_with_idnum((int)idnum); |
| assert(current_method != NULL, "old and but not obsolete, so should exist"); |
| methodHandle current_method_h(current_method == NULL? method_h() : current_method); |
| new_id = JNIHandles::make_jmethod_id(current_method_h); |
| } else { |
| // It is the current version of the method or an obsolete method, |
| // use the version passed in |
| new_id = JNIHandles::make_jmethod_id(method_h); |
| } |
| |
| if (Threads::number_of_threads() == 0 || |
| SafepointSynchronize::is_at_safepoint()) { |
| // we're single threaded or at a safepoint - no locking needed |
| id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths, |
| &to_dealloc_id, &to_dealloc_jmeths); |
| } else { |
| MutexLocker ml(JmethodIdCreation_lock); |
| id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths, |
| &to_dealloc_id, &to_dealloc_jmeths); |
| } |
| |
| // The lock has been dropped so we can free resources. |
| // Free up either the old cache or the new cache if we allocated one. |
| if (to_dealloc_jmeths != NULL) { |
| FreeHeap(to_dealloc_jmeths); |
| } |
| // free up the new ID since it wasn't needed |
| if (to_dealloc_id != NULL) { |
| JNIHandles::destroy_jmethod_id(to_dealloc_id); |
| } |
| } |
| return id; |
| } |
| |
| |
| // Common code to fetch the jmethodID from the cache or update the |
| // cache with the new jmethodID. This function should never do anything |
| // that causes the caller to go to a safepoint or we can deadlock with |
| // the VMThread or have cache consistency issues. |
| // |
| jmethodID instanceKlass::get_jmethod_id_fetch_or_update( |
| instanceKlassHandle ik_h, size_t idnum, jmethodID new_id, |
| jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, |
| jmethodID** to_dealloc_jmeths_p) { |
| assert(new_id != NULL, "sanity check"); |
| assert(to_dealloc_id_p != NULL, "sanity check"); |
| assert(to_dealloc_jmeths_p != NULL, "sanity check"); |
| assert(Threads::number_of_threads() == 0 || |
| SafepointSynchronize::is_at_safepoint() || |
| JmethodIdCreation_lock->owned_by_self(), "sanity check"); |
| |
| // reacquire the cache - we are locked, single threaded or at a safepoint |
| jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); |
| jmethodID id = NULL; |
| size_t length = 0; |
| |
| if (jmeths == NULL || // no cache yet |
| (length = (size_t)jmeths[0]) <= idnum) { // cache is too short |
| if (jmeths != NULL) { |
| // copy any existing entries from the old cache |
| for (size_t index = 0; index < length; index++) { |
| new_jmeths[index+1] = jmeths[index+1]; |
| } |
| *to_dealloc_jmeths_p = jmeths; // save old cache for later delete |
| } |
| ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths); |
| } else { |
| // fetch jmethodID (if any) from the existing cache |
| id = jmeths[idnum+1]; |
| *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete |
| } |
| if (id == NULL) { |
| // No matching jmethodID in the existing cache or we have a new |
| // cache or we just grew the cache. This cache write is done here |
| // by the first thread to win the foot race because a jmethodID |
| // needs to be unique once it is generally available. |
| id = new_id; |
| |
| // The jmethodID cache can be read while unlocked so we have to |
| // make sure the new jmethodID is complete before installing it |
| // in the cache. |
| OrderAccess::release_store_ptr(&jmeths[idnum+1], id); |
| } else { |
| *to_dealloc_id_p = new_id; // save new id for later delete |
| } |
| return id; |
| } |
| |
| |
| // Common code to get the jmethodID cache length and the jmethodID |
| // value at index idnum if there is one. |
| // |
| void instanceKlass::get_jmethod_id_length_value(jmethodID* cache, |
| size_t idnum, size_t *length_p, jmethodID* id_p) { |
| assert(cache != NULL, "sanity check"); |
| assert(length_p != NULL, "sanity check"); |
| assert(id_p != NULL, "sanity check"); |
| |
| // cache size is stored in element[0], other elements offset by one |
| *length_p = (size_t)cache[0]; |
| if (*length_p <= idnum) { // cache is too short |
| *id_p = NULL; |
| } else { |
| *id_p = cache[idnum+1]; // fetch jmethodID (if any) |
| } |
| } |
| |
| |
| // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles |
| jmethodID instanceKlass::jmethod_id_or_null(methodOop method) { |
| size_t idnum = (size_t)method->method_idnum(); |
| jmethodID* jmeths = methods_jmethod_ids_acquire(); |
| size_t length; // length assigned as debugging crumb |
| jmethodID id = NULL; |
| if (jmeths != NULL && // If there is a cache |
| (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, |
| id = jmeths[idnum+1]; // Look up the id (may be NULL) |
| } |
| return id; |
| } |
| |
| |
| // Cache an itable index |
| void instanceKlass::set_cached_itable_index(size_t idnum, int index) { |
| int* indices = methods_cached_itable_indices_acquire(); |
| int* to_dealloc_indices = NULL; |
| |
| // We use a double-check locking idiom here because this cache is |
| // performance sensitive. In the normal system, this cache only |
| // transitions from NULL to non-NULL which is safe because we use |
| // release_set_methods_cached_itable_indices() to advertise the |
| // new cache. A partially constructed cache should never be seen |
| // by a racing thread. Cache reads and writes proceed without a |
| // lock, but creation of the cache itself requires no leaks so a |
| // lock is generally acquired in that case. |
| // |
| // If the RedefineClasses() API has been used, then this cache can |
| // grow and we'll have transitions from non-NULL to bigger non-NULL. |
| // Cache creation requires no leaks and we require safety between all |
| // cache accesses and freeing of the old cache so a lock is generally |
| // acquired when the RedefineClasses() API has been used. |
| |
| if (indices == NULL || idnum_can_increment()) { |
| // we need a cache or the cache can grow |
| MutexLocker ml(JNICachedItableIndex_lock); |
| // reacquire the cache to see if another thread already did the work |
| indices = methods_cached_itable_indices_acquire(); |
| size_t length = 0; |
| // cache size is stored in element[0], other elements offset by one |
| if (indices == NULL || (length = (size_t)indices[0]) <= idnum) { |
| size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); |
| int* new_indices = NEW_C_HEAP_ARRAY(int, size+1); |
| new_indices[0] = (int)size; |
| // copy any existing entries |
| size_t i; |
| for (i = 0; i < length; i++) { |
| new_indices[i+1] = indices[i+1]; |
| } |
| // Set all the rest to -1 |
| for (i = length; i < size; i++) { |
| new_indices[i+1] = -1; |
| } |
| if (indices != NULL) { |
| // We have an old cache to delete so save it for after we |
| // drop the lock. |
| to_dealloc_indices = indices; |
| } |
| release_set_methods_cached_itable_indices(indices = new_indices); |
| } |
| |
| if (idnum_can_increment()) { |
| // this cache can grow so we have to write to it safely |
| indices[idnum+1] = index; |
| } |
| } else { |
| CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); |
| } |
| |
| if (!idnum_can_increment()) { |
| // The cache cannot grow and this JNI itable index value does not |
| // have to be unique like a jmethodID. If there is a race to set it, |
| // it doesn't matter. |
| indices[idnum+1] = index; |
| } |
| |
| if (to_dealloc_indices != NULL) { |
| // we allocated a new cache so free the old one |
| FreeHeap(to_dealloc_indices); |
| } |
| } |
| |
| |
| // Retrieve a cached itable index |
| int instanceKlass::cached_itable_index(size_t idnum) { |
| int* indices = methods_cached_itable_indices_acquire(); |
| if (indices != NULL && ((size_t)indices[0]) > idnum) { |
| // indices exist and are long enough, retrieve possible cached |
| return indices[idnum+1]; |
| } |
| return -1; |
| } |
| |
| |
| // |
| // Walk the list of dependent nmethods searching for nmethods which |
| // are dependent on the changes that were passed in and mark them for |
| // deoptimization. Returns the number of nmethods found. |
| // |
| int instanceKlass::mark_dependent_nmethods(DepChange& changes) { |
| assert_locked_or_safepoint(CodeCache_lock); |
| int found = 0; |
| nmethodBucket* b = _dependencies; |
| while (b != NULL) { |
| nmethod* nm = b->get_nmethod(); |
| // since dependencies aren't removed until an nmethod becomes a zombie, |
| // the dependency list may contain nmethods which aren't alive. |
| if (nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) { |
| if (TraceDependencies) { |
| ResourceMark rm; |
| tty->print_cr("Marked for deoptimization"); |
| tty->print_cr(" context = %s", this->external_name()); |
| changes.print(); |
| nm->print(); |
| nm->print_dependencies(); |
| } |
| nm->mark_for_deoptimization(); |
| found++; |
| } |
| b = b->next(); |
| } |
| return found; |
| } |
| |
| |
| // |
| // Add an nmethodBucket to the list of dependencies for this nmethod. |
| // It's possible that an nmethod has multiple dependencies on this klass |
| // so a count is kept for each bucket to guarantee that creation and |
| // deletion of dependencies is consistent. |
| // |
| void instanceKlass::add_dependent_nmethod(nmethod* nm) { |
| assert_locked_or_safepoint(CodeCache_lock); |
| nmethodBucket* b = _dependencies; |
| nmethodBucket* last = NULL; |
| while (b != NULL) { |
| if (nm == b->get_nmethod()) { |
| b->increment(); |
| return; |
| } |
| b = b->next(); |
| } |
| _dependencies = new nmethodBucket(nm, _dependencies); |
| } |
| |
| |
| // |
| // Decrement count of the nmethod in the dependency list and remove |
| // the bucket competely when the count goes to 0. This method must |
| // find a corresponding bucket otherwise there's a bug in the |
| // recording of dependecies. |
| // |
| void instanceKlass::remove_dependent_nmethod(nmethod* nm) { |
| assert_locked_or_safepoint(CodeCache_lock); |
| nmethodBucket* b = _dependencies; |
| nmethodBucket* last = NULL; |
| while (b != NULL) { |
| if (nm == b->get_nmethod()) { |
| if (b->decrement() == 0) { |
| if (last == NULL) { |
| _dependencies = b->next(); |
| } else { |
| last->set_next(b->next()); |
| } |
| delete b; |
| } |
| return; |
| } |
| last = b; |
| b = b->next(); |
| } |
| #ifdef ASSERT |
| tty->print_cr("### %s can't find dependent nmethod:", this->external_name()); |
| nm->print(); |
| #endif // ASSERT |
| ShouldNotReachHere(); |
| } |
| |
| |
| #ifndef PRODUCT |
| void instanceKlass::print_dependent_nmethods(bool verbose) { |
| nmethodBucket* b = _dependencies; |
| int idx = 0; |
| while (b != NULL) { |
| nmethod* nm = b->get_nmethod(); |
| tty->print("[%d] count=%d { ", idx++, b->count()); |
| if (!verbose) { |
| nm->print_on(tty, "nmethod"); |
| tty->print_cr(" } "); |
| } else { |
| nm->print(); |
| nm->print_dependencies(); |
| tty->print_cr("--- } "); |
| } |
| b = b->next(); |
| } |
| } |
| |
| |
| bool instanceKlass::is_dependent_nmethod(nmethod* nm) { |
| nmethodBucket* b = _dependencies; |
| while (b != NULL) { |
| if (nm == b->get_nmethod()) { |
| return true; |
| } |
| b = b->next(); |
| } |
| return false; |
| } |
| #endif //PRODUCT |
| |
| |
| #ifdef ASSERT |
| template <class T> void assert_is_in(T *p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| if (!oopDesc::is_null(heap_oop)) { |
| oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
| assert(Universe::heap()->is_in(o), "should be in heap"); |
| } |
| } |
| template <class T> void assert_is_in_closed_subset(T *p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| if (!oopDesc::is_null(heap_oop)) { |
| oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
| assert(Universe::heap()->is_in_closed_subset(o), "should be in closed"); |
| } |
| } |
| template <class T> void assert_is_in_reserved(T *p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| if (!oopDesc::is_null(heap_oop)) { |
| oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
| assert(Universe::heap()->is_in_reserved(o), "should be in reserved"); |
| } |
| } |
| template <class T> void assert_nothing(T *p) {} |
| |
| #else |
| template <class T> void assert_is_in(T *p) {} |
| template <class T> void assert_is_in_closed_subset(T *p) {} |
| template <class T> void assert_is_in_reserved(T *p) {} |
| template <class T> void assert_nothing(T *p) {} |
| #endif // ASSERT |
| |
| // |
| // Macros that iterate over areas of oops which are specialized on type of |
| // oop pointer either narrow or wide, depending on UseCompressedOops |
| // |
| // Parameters are: |
| // T - type of oop to point to (either oop or narrowOop) |
| // start_p - starting pointer for region to iterate over |
| // count - number of oops or narrowOops to iterate over |
| // do_oop - action to perform on each oop (it's arbitrary C code which |
| // makes it more efficient to put in a macro rather than making |
| // it a template function) |
| // assert_fn - assert function which is template function because performance |
| // doesn't matter when enabled. |
| #define InstanceKlass_SPECIALIZED_OOP_ITERATE( \ |
| T, start_p, count, do_oop, \ |
| assert_fn) \ |
| { \ |
| T* p = (T*)(start_p); \ |
| T* const end = p + (count); \ |
| while (p < end) { \ |
| (assert_fn)(p); \ |
| do_oop; \ |
| ++p; \ |
| } \ |
| } |
| |
| #define InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE( \ |
| T, start_p, count, do_oop, \ |
| assert_fn) \ |
| { \ |
| T* const start = (T*)(start_p); \ |
| T* p = start + (count); \ |
| while (start < p) { \ |
| --p; \ |
| (assert_fn)(p); \ |
| do_oop; \ |
| } \ |
| } |
| |
| #define InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \ |
| T, start_p, count, low, high, \ |
| do_oop, assert_fn) \ |
| { \ |
| T* const l = (T*)(low); \ |
| T* const h = (T*)(high); \ |
| assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \ |
| mask_bits((intptr_t)h, sizeof(T)-1) == 0, \ |
| "bounded region must be properly aligned"); \ |
| T* p = (T*)(start_p); \ |
| T* end = p + (count); \ |
| if (p < l) p = l; \ |
| if (end > h) end = h; \ |
| while (p < end) { \ |
| (assert_fn)(p); \ |
| do_oop; \ |
| ++p; \ |
| } \ |
| } |
| |
| |
| // The following macros call specialized macros, passing either oop or |
| // narrowOop as the specialization type. These test the UseCompressedOops |
| // flag. |
| #define InstanceKlass_OOP_MAP_ITERATE(obj, do_oop, assert_fn) \ |
| { \ |
| /* Compute oopmap block range. The common case \ |
| is nonstatic_oop_map_size == 1. */ \ |
| OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
| OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \ |
| if (UseCompressedOops) { \ |
| while (map < end_map) { \ |
| InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \ |
| obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
| do_oop, assert_fn) \ |
| ++map; \ |
| } \ |
| } else { \ |
| while (map < end_map) { \ |
| InstanceKlass_SPECIALIZED_OOP_ITERATE(oop, \ |
| obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
| do_oop, assert_fn) \ |
| ++map; \ |
| } \ |
| } \ |
| } |
| |
| #define InstanceKlass_OOP_MAP_REVERSE_ITERATE(obj, do_oop, assert_fn) \ |
| { \ |
| OopMapBlock* const start_map = start_of_nonstatic_oop_maps(); \ |
| OopMapBlock* map = start_map + nonstatic_oop_map_count(); \ |
| if (UseCompressedOops) { \ |
| while (start_map < map) { \ |
| --map; \ |
| InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(narrowOop, \ |
| obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
| do_oop, assert_fn) \ |
| } \ |
| } else { \ |
| while (start_map < map) { \ |
| --map; \ |
| InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(oop, \ |
| obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
| do_oop, assert_fn) \ |
| } \ |
| } \ |
| } |
| |
| #define InstanceKlass_BOUNDED_OOP_MAP_ITERATE(obj, low, high, do_oop, \ |
| assert_fn) \ |
| { \ |
| /* Compute oopmap block range. The common case is \ |
| nonstatic_oop_map_size == 1, so we accept the \ |
| usually non-existent extra overhead of examining \ |
| all the maps. */ \ |
| OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
| OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \ |
| if (UseCompressedOops) { \ |
| while (map < end_map) { \ |
| InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ |
| obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
| low, high, \ |
| do_oop, assert_fn) \ |
| ++map; \ |
| } \ |
| } else { \ |
| while (map < end_map) { \ |
| InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ |
| obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
| low, high, \ |
| do_oop, assert_fn) \ |
| ++map; \ |
| } \ |
| } \ |
| } |
| |
| void instanceKlass::oop_follow_contents(oop obj) { |
| assert(obj != NULL, "can't follow the content of NULL object"); |
| obj->follow_header(); |
| InstanceKlass_OOP_MAP_ITERATE( \ |
| obj, \ |
| MarkSweep::mark_and_push(p), \ |
| assert_is_in_closed_subset) |
| } |
| |
| #ifndef SERIALGC |
| void instanceKlass::oop_follow_contents(ParCompactionManager* cm, |
| oop obj) { |
| assert(obj != NULL, "can't follow the content of NULL object"); |
| obj->follow_header(cm); |
| InstanceKlass_OOP_MAP_ITERATE( \ |
| obj, \ |
| PSParallelCompact::mark_and_push(cm, p), \ |
| assert_is_in) |
| } |
| #endif // SERIALGC |
| |
| // closure's do_header() method dicates whether the given closure should be |
| // applied to the klass ptr in the object header. |
| |
| #define InstanceKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| int instanceKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
| SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
| /* header */ \ |
| if (closure->do_header()) { \ |
| obj->oop_iterate_header(closure); \ |
| } \ |
| InstanceKlass_OOP_MAP_ITERATE( \ |
| obj, \ |
| SpecializationStats:: \ |
| record_do_oop_call##nv_suffix(SpecializationStats::ik); \ |
| (closure)->do_oop##nv_suffix(p), \ |
| assert_is_in_closed_subset) \ |
| return size_helper(); \ |
| } |
| |
| #ifndef SERIALGC |
| #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| int instanceKlass::oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
| OopClosureType* closure) { \ |
| SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik); \ |
| /* header */ \ |
| if (closure->do_header()) { \ |
| obj->oop_iterate_header(closure); \ |
| } \ |
| /* instance variables */ \ |
| InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
| obj, \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::ik);\ |
| (closure)->do_oop##nv_suffix(p), \ |
| assert_is_in_closed_subset) \ |
| return size_helper(); \ |
| } |
| #endif // !SERIALGC |
| |
| #define InstanceKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
| \ |
| int instanceKlass::oop_oop_iterate##nv_suffix##_m(oop obj, \ |
| OopClosureType* closure, \ |
| MemRegion mr) { \ |
| SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
| if (closure->do_header()) { \ |
| obj->oop_iterate_header(closure, mr); \ |
| } \ |
| InstanceKlass_BOUNDED_OOP_MAP_ITERATE( \ |
| obj, mr.start(), mr.end(), \ |
| (closure)->do_oop##nv_suffix(p), \ |
| assert_is_in_closed_subset) \ |
| return size_helper(); \ |
| } |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
| #ifndef SERIALGC |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
| #endif // !SERIALGC |
| |
| int instanceKlass::oop_adjust_pointers(oop obj) { |
| int size = size_helper(); |
| InstanceKlass_OOP_MAP_ITERATE( \ |
| obj, \ |
| MarkSweep::adjust_pointer(p), \ |
| assert_is_in) |
| obj->adjust_header(); |
| return size; |
| } |
| |
| #ifndef SERIALGC |
| void instanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { |
| InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
| obj, \ |
| if (PSScavenge::should_scavenge(p)) { \ |
| pm->claim_or_forward_depth(p); \ |
| }, \ |
| assert_nothing ) |
| } |
| |
| int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { |
| InstanceKlass_OOP_MAP_ITERATE( \ |
| obj, \ |
| PSParallelCompact::adjust_pointer(p), \ |
| assert_nothing) |
| return size_helper(); |
| } |
| |
| #endif // SERIALGC |
| |
| // This klass is alive but the implementor link is not followed/updated. |
| // Subklass and sibling links are handled by Klass::follow_weak_klass_links |
| |
| void instanceKlass::follow_weak_klass_links( |
| BoolObjectClosure* is_alive, OopClosure* keep_alive) { |
| assert(is_alive->do_object_b(as_klassOop()), "this oop should be live"); |
| if (ClassUnloading) { |
| for (int i = 0; i < implementors_limit; i++) { |
| klassOop impl = _implementors[i]; |
| if (impl == NULL) break; // no more in the list |
| if (!is_alive->do_object_b(impl)) { |
| // remove this guy from the list by overwriting him with the tail |
| int lasti = --_nof_implementors; |
| assert(lasti >= i && lasti < implementors_limit, "just checking"); |
| _implementors[i] = _implementors[lasti]; |
| _implementors[lasti] = NULL; |
| --i; // rerun the loop at this index |
| } |
| } |
| } else { |
| for (int i = 0; i < implementors_limit; i++) { |
| keep_alive->do_oop(&adr_implementors()[i]); |
| } |
| } |
| Klass::follow_weak_klass_links(is_alive, keep_alive); |
| } |
| |
| void instanceKlass::remove_unshareable_info() { |
| Klass::remove_unshareable_info(); |
| init_implementor(); |
| } |
| |
| static void clear_all_breakpoints(methodOop m) { |
| m->clear_all_breakpoints(); |
| } |
| |
| void instanceKlass::release_C_heap_structures() { |
| // Deallocate oop map cache |
| if (_oop_map_cache != NULL) { |
| delete _oop_map_cache; |
| _oop_map_cache = NULL; |
| } |
| |
| // Deallocate JNI identifiers for jfieldIDs |
| JNIid::deallocate(jni_ids()); |
| set_jni_ids(NULL); |
| |
| jmethodID* jmeths = methods_jmethod_ids_acquire(); |
| if (jmeths != (jmethodID*)NULL) { |
| release_set_methods_jmethod_ids(NULL); |
| FreeHeap(jmeths); |
| } |
| |
| int* indices = methods_cached_itable_indices_acquire(); |
| if (indices != (int*)NULL) { |
| release_set_methods_cached_itable_indices(NULL); |
| FreeHeap(indices); |
| } |
| |
| // release dependencies |
| nmethodBucket* b = _dependencies; |
| _dependencies = NULL; |
| while (b != NULL) { |
| nmethodBucket* next = b->next(); |
| delete b; |
| b = next; |
| } |
| |
| // Deallocate breakpoint records |
| if (breakpoints() != 0x0) { |
| methods_do(clear_all_breakpoints); |
| assert(breakpoints() == 0x0, "should have cleared breakpoints"); |
| } |
| |
| // deallocate information about previous versions |
| if (_previous_versions != NULL) { |
| for (int i = _previous_versions->length() - 1; i >= 0; i--) { |
| PreviousVersionNode * pv_node = _previous_versions->at(i); |
| delete pv_node; |
| } |
| delete _previous_versions; |
| _previous_versions = NULL; |
| } |
| |
| // deallocate the cached class file |
| if (_cached_class_file_bytes != NULL) { |
| os::free(_cached_class_file_bytes); |
| _cached_class_file_bytes = NULL; |
| _cached_class_file_len = 0; |
| } |
| |
| // Decrement symbol reference counts associated with the unloaded class. |
| if (_name != NULL) _name->decrement_refcount(); |
| // unreference array name derived from this class name (arrays of an unloaded |
| // class can't be referenced anymore). |
| if (_array_name != NULL) _array_name->decrement_refcount(); |
| if (_source_file_name != NULL) _source_file_name->decrement_refcount(); |
| if (_source_debug_extension != NULL) _source_debug_extension->decrement_refcount(); |
| // walk constant pool and decrement symbol reference counts |
| _constants->unreference_symbols(); |
| } |
| |
| void instanceKlass::set_source_file_name(Symbol* n) { |
| _source_file_name = n; |
| if (_source_file_name != NULL) _source_file_name->increment_refcount(); |
| } |
| |
| void instanceKlass::set_source_debug_extension(Symbol* n) { |
| _source_debug_extension = n; |
| if (_source_debug_extension != NULL) _source_debug_extension->increment_refcount(); |
| } |
| |
| address instanceKlass::static_field_addr(int offset) { |
| return (address)(offset + instanceMirrorKlass::offset_of_static_fields() + (intptr_t)java_mirror()); |
| } |
| |
| |
| const char* instanceKlass::signature_name() const { |
| const char* src = (const char*) (name()->as_C_string()); |
| const int src_length = (int)strlen(src); |
| char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3); |
| int src_index = 0; |
| int dest_index = 0; |
| dest[dest_index++] = 'L'; |
| while (src_index < src_length) { |
| dest[dest_index++] = src[src_index++]; |
| } |
| dest[dest_index++] = ';'; |
| dest[dest_index] = '\0'; |
| return dest; |
| } |
| |
| // different verisons of is_same_class_package |
| bool instanceKlass::is_same_class_package(klassOop class2) { |
| klassOop class1 = as_klassOop(); |
| oop classloader1 = instanceKlass::cast(class1)->class_loader(); |
| Symbol* classname1 = Klass::cast(class1)->name(); |
| |
| if (Klass::cast(class2)->oop_is_objArray()) { |
| class2 = objArrayKlass::cast(class2)->bottom_klass(); |
| } |
| oop classloader2; |
| if (Klass::cast(class2)->oop_is_instance()) { |
| classloader2 = instanceKlass::cast(class2)->class_loader(); |
| } else { |
| assert(Klass::cast(class2)->oop_is_typeArray(), "should be type array"); |
| classloader2 = NULL; |
| } |
| Symbol* classname2 = Klass::cast(class2)->name(); |
| |
| return instanceKlass::is_same_class_package(classloader1, classname1, |
| classloader2, classname2); |
| } |
| |
| bool instanceKlass::is_same_class_package(oop classloader2, Symbol* classname2) { |
| klassOop class1 = as_klassOop(); |
| oop classloader1 = instanceKlass::cast(class1)->class_loader(); |
| Symbol* classname1 = Klass::cast(class1)->name(); |
| |
| return instanceKlass::is_same_class_package(classloader1, classname1, |
| classloader2, classname2); |
| } |
| |
| // return true if two classes are in the same package, classloader |
| // and classname information is enough to determine a class's package |
| bool instanceKlass::is_same_class_package(oop class_loader1, Symbol* class_name1, |
| oop class_loader2, Symbol* class_name2) { |
| if (class_loader1 != class_loader2) { |
| return false; |
| } else if (class_name1 == class_name2) { |
| return true; // skip painful bytewise comparison |
| } else { |
| ResourceMark rm; |
| |
| // The Symbol*'s are in UTF8 encoding. Since we only need to check explicitly |
| // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding. |
| // Otherwise, we just compare jbyte values between the strings. |
| const jbyte *name1 = class_name1->base(); |
| const jbyte *name2 = class_name2->base(); |
| |
| const jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/'); |
| const jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/'); |
| |
| if ((last_slash1 == NULL) || (last_slash2 == NULL)) { |
| // One of the two doesn't have a package. Only return true |
| // if the other one also doesn't have a package. |
| return last_slash1 == last_slash2; |
| } else { |
| // Skip over '['s |
| if (*name1 == '[') { |
| do { |
| name1++; |
| } while (*name1 == '['); |
| if (*name1 != 'L') { |
| // Something is terribly wrong. Shouldn't be here. |
| return false; |
| } |
| } |
| if (*name2 == '[') { |
| do { |
| name2++; |
| } while (*name2 == '['); |
| if (*name2 != 'L') { |
| // Something is terribly wrong. Shouldn't be here. |
| return false; |
| } |
| } |
| |
| // Check that package part is identical |
| int length1 = last_slash1 - name1; |
| int length2 = last_slash2 - name2; |
| |
| return UTF8::equal(name1, length1, name2, length2); |
| } |
| } |
| } |
| |
| // Returns true iff super_method can be overridden by a method in targetclassname |
| // See JSL 3rd edition 8.4.6.1 |
| // Assumes name-signature match |
| // "this" is instanceKlass of super_method which must exist |
| // note that the instanceKlass of the method in the targetclassname has not always been created yet |
| bool instanceKlass::is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) { |
| // Private methods can not be overridden |
| if (super_method->is_private()) { |
| return false; |
| } |
| // If super method is accessible, then override |
| if ((super_method->is_protected()) || |
| (super_method->is_public())) { |
| return true; |
| } |
| // Package-private methods are not inherited outside of package |
| assert(super_method->is_package_private(), "must be package private"); |
| return(is_same_class_package(targetclassloader(), targetclassname)); |
| } |
| |
| /* defined for now in jvm.cpp, for historical reasons *-- |
| klassOop instanceKlass::compute_enclosing_class_impl(instanceKlassHandle self, |
| Symbol*& simple_name_result, TRAPS) { |
| ... |
| } |
| */ |
| |
| // tell if two classes have the same enclosing class (at package level) |
| bool instanceKlass::is_same_package_member_impl(instanceKlassHandle class1, |
| klassOop class2_oop, TRAPS) { |
| if (class2_oop == class1->as_klassOop()) return true; |
| if (!Klass::cast(class2_oop)->oop_is_instance()) return false; |
| instanceKlassHandle class2(THREAD, class2_oop); |
| |
| // must be in same package before we try anything else |
| if (!class1->is_same_class_package(class2->class_loader(), class2->name())) |
| return false; |
| |
| // As long as there is an outer1.getEnclosingClass, |
| // shift the search outward. |
| instanceKlassHandle outer1 = class1; |
| for (;;) { |
| // As we walk along, look for equalities between outer1 and class2. |
| // Eventually, the walks will terminate as outer1 stops |
| // at the top-level class around the original class. |
| bool ignore_inner_is_member; |
| klassOop next = outer1->compute_enclosing_class(&ignore_inner_is_member, |
| CHECK_false); |
| if (next == NULL) break; |
| if (next == class2()) return true; |
| outer1 = instanceKlassHandle(THREAD, next); |
| } |
| |
| // Now do the same for class2. |
| instanceKlassHandle outer2 = class2; |
| for (;;) { |
| bool ignore_inner_is_member; |
| klassOop next = outer2->compute_enclosing_class(&ignore_inner_is_member, |
| CHECK_false); |
| if (next == NULL) break; |
| // Might as well check the new outer against all available values. |
| if (next == class1()) return true; |
| if (next == outer1()) return true; |
| outer2 = instanceKlassHandle(THREAD, next); |
| } |
| |
| // If by this point we have not found an equality between the |
| // two classes, we know they are in separate package members. |
| return false; |
| } |
| |
| |
| jint instanceKlass::compute_modifier_flags(TRAPS) const { |
| klassOop k = as_klassOop(); |
| jint access = access_flags().as_int(); |
| |
| // But check if it happens to be member class. |
| instanceKlassHandle ik(THREAD, k); |
| InnerClassesIterator iter(ik); |
| for (; !iter.done(); iter.next()) { |
| int ioff = iter.inner_class_info_index(); |
| // Inner class attribute can be zero, skip it. |
| // Strange but true: JVM spec. allows null inner class refs. |
| if (ioff == 0) continue; |
| |
| // only look at classes that are already loaded |
| // since we are looking for the flags for our self. |
| Symbol* inner_name = ik->constants()->klass_name_at(ioff); |
| if ((ik->name() == inner_name)) { |
| // This is really a member class. |
| access = iter.inner_access_flags(); |
| break; |
| } |
| } |
| // Remember to strip ACC_SUPER bit |
| return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; |
| } |
| |
| jint instanceKlass::jvmti_class_status() const { |
| jint result = 0; |
| |
| if (is_linked()) { |
| result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; |
| } |
| |
| if (is_initialized()) { |
| assert(is_linked(), "Class status is not consistent"); |
| result |= JVMTI_CLASS_STATUS_INITIALIZED; |
| } |
| if (is_in_error_state()) { |
| result |= JVMTI_CLASS_STATUS_ERROR; |
| } |
| return result; |
| } |
| |
| methodOop instanceKlass::method_at_itable(klassOop holder, int index, TRAPS) { |
| itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); |
| int method_table_offset_in_words = ioe->offset()/wordSize; |
| int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) |
| / itableOffsetEntry::size(); |
| |
| for (int cnt = 0 ; ; cnt ++, ioe ++) { |
| // If the interface isn't implemented by the receiver class, |
| // the VM should throw IncompatibleClassChangeError. |
| if (cnt >= nof_interfaces) { |
| THROW_0(vmSymbols::java_lang_IncompatibleClassChangeError()); |
| } |
| |
| klassOop ik = ioe->interface_klass(); |
| if (ik == holder) break; |
| } |
| |
| itableMethodEntry* ime = ioe->first_method_entry(as_klassOop()); |
| methodOop m = ime[index].method(); |
| if (m == NULL) { |
| THROW_0(vmSymbols::java_lang_AbstractMethodError()); |
| } |
| return m; |
| } |
| |
| // On-stack replacement stuff |
| void instanceKlass::add_osr_nmethod(nmethod* n) { |
| // only one compilation can be active |
| NEEDS_CLEANUP |
| // This is a short non-blocking critical region, so the no safepoint check is ok. |
| OsrList_lock->lock_without_safepoint_check(); |
| assert(n->is_osr_method(), "wrong kind of nmethod"); |
| n->set_osr_link(osr_nmethods_head()); |
| set_osr_nmethods_head(n); |
| // Raise the highest osr level if necessary |
| if (TieredCompilation) { |
| methodOop m = n->method(); |
| m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level())); |
| } |
| // Remember to unlock again |
| OsrList_lock->unlock(); |
| |
| // Get rid of the osr methods for the same bci that have lower levels. |
| if (TieredCompilation) { |
| for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { |
| nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); |
| if (inv != NULL && inv->is_in_use()) { |
| inv->make_not_entrant(); |
| } |
| } |
| } |
| } |
| |
| |
| void instanceKlass::remove_osr_nmethod(nmethod* n) { |
| // This is a short non-blocking critical region, so the no safepoint check is ok. |
| OsrList_lock->lock_without_safepoint_check(); |
| assert(n->is_osr_method(), "wrong kind of nmethod"); |
| nmethod* last = NULL; |
| nmethod* cur = osr_nmethods_head(); |
| int max_level = CompLevel_none; // Find the max comp level excluding n |
| methodOop m = n->method(); |
| // Search for match |
| while(cur != NULL && cur != n) { |
| if (TieredCompilation) { |
| // Find max level before n |
| max_level = MAX2(max_level, cur->comp_level()); |
| } |
| last = cur; |
| cur = cur->osr_link(); |
| } |
| nmethod* next = NULL; |
| if (cur == n) { |
| next = cur->osr_link(); |
| if (last == NULL) { |
| // Remove first element |
| set_osr_nmethods_head(next); |
| } else { |
| last->set_osr_link(next); |
| } |
| } |
| n->set_osr_link(NULL); |
| if (TieredCompilation) { |
| cur = next; |
| while (cur != NULL) { |
| // Find max level after n |
| max_level = MAX2(max_level, cur->comp_level()); |
| cur = cur->osr_link(); |
| } |
| m->set_highest_osr_comp_level(max_level); |
| } |
| // Remember to unlock again |
| OsrList_lock->unlock(); |
| } |
| |
| nmethod* instanceKlass::lookup_osr_nmethod(const methodOop m, int bci, int comp_level, bool match_level) const { |
| // This is a short non-blocking critical region, so the no safepoint check is ok. |
| OsrList_lock->lock_without_safepoint_check(); |
| nmethod* osr = osr_nmethods_head(); |
| nmethod* best = NULL; |
| while (osr != NULL) { |
| assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); |
| // There can be a time when a c1 osr method exists but we are waiting |
| // for a c2 version. When c2 completes its osr nmethod we will trash |
| // the c1 version and only be able to find the c2 version. However |
| // while we overflow in the c1 code at back branches we don't want to |
| // try and switch to the same code as we are already running |
| |
| if (osr->method() == m && |
| (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { |
| if (match_level) { |
| if (osr->comp_level() == comp_level) { |
| // Found a match - return it. |
| OsrList_lock->unlock(); |
| return osr; |
| } |
| } else { |
| if (best == NULL || (osr->comp_level() > best->comp_level())) { |
| if (osr->comp_level() == CompLevel_highest_tier) { |
| // Found the best possible - return it. |
| OsrList_lock->unlock(); |
| return osr; |
| } |
| best = osr; |
| } |
| } |
| } |
| osr = osr->osr_link(); |
| } |
| OsrList_lock->unlock(); |
| if (best != NULL && best->comp_level() >= comp_level && match_level == false) { |
| return best; |
| } |
| return NULL; |
| } |
| |
| // ----------------------------------------------------------------------------------------------------- |
| #ifndef PRODUCT |
| |
| // Printing |
| |
| #define BULLET " - " |
| |
| void FieldPrinter::do_field(fieldDescriptor* fd) { |
| _st->print(BULLET); |
| if (_obj == NULL) { |
| fd->print_on(_st); |
| _st->cr(); |
| } else { |
| fd->print_on_for(_st, _obj); |
| _st->cr(); |
| } |
| } |
| |
| |
| void instanceKlass::oop_print_on(oop obj, outputStream* st) { |
| Klass::oop_print_on(obj, st); |
| |
| if (as_klassOop() == SystemDictionary::String_klass()) { |
| typeArrayOop value = java_lang_String::value(obj); |
| juint offset = java_lang_String::offset(obj); |
| juint length = java_lang_String::length(obj); |
| if (value != NULL && |
| value->is_typeArray() && |
| offset <= (juint) value->length() && |
| offset + length <= (juint) value->length()) { |
| st->print(BULLET"string: "); |
| Handle h_obj(obj); |
| java_lang_String::print(h_obj, st); |
| st->cr(); |
| if (!WizardMode) return; // that is enough |
| } |
| } |
| |
| st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); |
| FieldPrinter print_field(st, obj); |
| do_nonstatic_fields(&print_field); |
| |
| if (as_klassOop() == SystemDictionary::Class_klass()) { |
| st->print(BULLET"signature: "); |
| java_lang_Class::print_signature(obj, st); |
| st->cr(); |
| klassOop mirrored_klass = java_lang_Class::as_klassOop(obj); |
| st->print(BULLET"fake entry for mirror: "); |
| mirrored_klass->print_value_on(st); |
| st->cr(); |
| st->print(BULLET"fake entry resolved_constructor: "); |
| methodOop ctor = java_lang_Class::resolved_constructor(obj); |
| ctor->print_value_on(st); |
| klassOop array_klass = java_lang_Class::array_klass(obj); |
| st->cr(); |
| st->print(BULLET"fake entry for array: "); |
| array_klass->print_value_on(st); |
| st->cr(); |
| st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj)); |
| st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj)); |
| klassOop real_klass = java_lang_Class::as_klassOop(obj); |
| if (real_klass != NULL && real_klass->klass_part()->oop_is_instance()) { |
| instanceKlass::cast(real_klass)->do_local_static_fields(&print_field); |
| } |
| } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
| st->print(BULLET"signature: "); |
| java_lang_invoke_MethodType::print_signature(obj, st); |
| st->cr(); |
| } |
| } |
| |
| #endif //PRODUCT |
| |
| void instanceKlass::oop_print_value_on(oop obj, outputStream* st) { |
| st->print("a "); |
| name()->print_value_on(st); |
| obj->print_address_on(st); |
| if (as_klassOop() == SystemDictionary::String_klass() |
| && java_lang_String::value(obj) != NULL) { |
| ResourceMark rm; |
| int len = java_lang_String::length(obj); |
| int plen = (len < 24 ? len : 12); |
| char* str = java_lang_String::as_utf8_string(obj, 0, plen); |
| st->print(" = \"%s\"", str); |
| if (len > plen) |
| st->print("...[%d]", len); |
| } else if (as_klassOop() == SystemDictionary::Class_klass()) { |
| klassOop k = java_lang_Class::as_klassOop(obj); |
| st->print(" = "); |
| if (k != NULL) { |
| k->print_value_on(st); |
| } else { |
| const char* tname = type2name(java_lang_Class::primitive_type(obj)); |
| st->print("%s", tname ? tname : "type?"); |
| } |
| } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
| st->print(" = "); |
| java_lang_invoke_MethodType::print_signature(obj, st); |
| } else if (java_lang_boxing_object::is_instance(obj)) { |
| st->print(" = "); |
| java_lang_boxing_object::print(obj, st); |
| } |
| } |
| |
| const char* instanceKlass::internal_name() const { |
| return external_name(); |
| } |
| |
| // Verification |
| |
| class VerifyFieldClosure: public OopClosure { |
| protected: |
| template <class T> void do_oop_work(T* p) { |
| guarantee(Universe::heap()->is_in_closed_subset(p), "should be in heap"); |
| oop obj = oopDesc::load_decode_heap_oop(p); |
| if (!obj->is_oop_or_null()) { |
| tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p, (address)obj); |
| Universe::print(); |
| guarantee(false, "boom"); |
| } |
| } |
| public: |
| virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } |
| virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } |
| }; |
| |
| void instanceKlass::oop_verify_on(oop obj, outputStream* st) { |
| Klass::oop_verify_on(obj, st); |
| VerifyFieldClosure blk; |
| oop_oop_iterate(obj, &blk); |
| } |
| |
| // JNIid class for jfieldIDs only |
| // Note to reviewers: |
| // These JNI functions are just moved over to column 1 and not changed |
| // in the compressed oops workspace. |
| JNIid::JNIid(klassOop holder, int offset, JNIid* next) { |
| _holder = holder; |
| _offset = offset; |
| _next = next; |
| debug_only(_is_static_field_id = false;) |
| } |
| |
| |
| JNIid* JNIid::find(int offset) { |
| JNIid* current = this; |
| while (current != NULL) { |
| if (current->offset() == offset) return current; |
| current = current->next(); |
| } |
| return NULL; |
| } |
| |
| void JNIid::oops_do(OopClosure* f) { |
| for (JNIid* cur = this; cur != NULL; cur = cur->next()) { |
| f->do_oop(cur->holder_addr()); |
| } |
| } |
| |
| void JNIid::deallocate(JNIid* current) { |
| while (current != NULL) { |
| JNIid* next = current->next(); |
| delete current; |
| current = next; |
| } |
| } |
| |
| |
| void JNIid::verify(klassOop holder) { |
| int first_field_offset = instanceMirrorKlass::offset_of_static_fields(); |
| int end_field_offset; |
| end_field_offset = first_field_offset + (instanceKlass::cast(holder)->static_field_size() * wordSize); |
| |
| JNIid* current = this; |
| while (current != NULL) { |
| guarantee(current->holder() == holder, "Invalid klass in JNIid"); |
| #ifdef ASSERT |
| int o = current->offset(); |
| if (current->is_static_field_id()) { |
| guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); |
| } |
| #endif |
| current = current->next(); |
| } |
| } |
| |
| |
| #ifdef ASSERT |
| void instanceKlass::set_init_state(ClassState state) { |
| bool good_state = as_klassOop()->is_shared() ? (_init_state <= state) |
| : (_init_state < state); |
| assert(good_state || state == allocated, "illegal state transition"); |
| _init_state = (u1)state; |
| } |
| #endif |
| |
| |
| // RedefineClasses() support for previous versions: |
| |
| // Add an information node that contains weak references to the |
| // interesting parts of the previous version of the_class. |
| // This is also where we clean out any unused weak references. |
| // Note that while we delete nodes from the _previous_versions |
| // array, we never delete the array itself until the klass is |
| // unloaded. The has_been_redefined() query depends on that fact. |
| // |
| void instanceKlass::add_previous_version(instanceKlassHandle ikh, |
| BitMap* emcp_methods, int emcp_method_count) { |
| assert(Thread::current()->is_VM_thread(), |
| "only VMThread can add previous versions"); |
| |
| if (_previous_versions == NULL) { |
| // This is the first previous version so make some space. |
| // Start with 2 elements under the assumption that the class |
| // won't be redefined much. |
| _previous_versions = new (ResourceObj::C_HEAP) |
| GrowableArray<PreviousVersionNode *>(2, true); |
| } |
| |
| // RC_TRACE macro has an embedded ResourceMark |
| RC_TRACE(0x00000100, ("adding previous version ref for %s @%d, EMCP_cnt=%d", |
| ikh->external_name(), _previous_versions->length(), emcp_method_count)); |
| constantPoolHandle cp_h(ikh->constants()); |
| jobject cp_ref; |
| if (cp_h->is_shared()) { |
| // a shared ConstantPool requires a regular reference; a weak |
| // reference would be collectible |
| cp_ref = JNIHandles::make_global(cp_h); |
| } else { |
| cp_ref = JNIHandles::make_weak_global(cp_h); |
| } |
| PreviousVersionNode * pv_node = NULL; |
| objArrayOop old_methods = ikh->methods(); |
| |
| if (emcp_method_count == 0) { |
| // non-shared ConstantPool gets a weak reference |
| pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), NULL); |
| RC_TRACE(0x00000400, |
| ("add: all methods are obsolete; flushing any EMCP weak refs")); |
| } else { |
| int local_count = 0; |
| GrowableArray<jweak>* method_refs = new (ResourceObj::C_HEAP) |
| GrowableArray<jweak>(emcp_method_count, true); |
| for (int i = 0; i < old_methods->length(); i++) { |
| if (emcp_methods->at(i)) { |
| // this old method is EMCP so save a weak ref |
| methodOop old_method = (methodOop) old_methods->obj_at(i); |
| methodHandle old_method_h(old_method); |
| jweak method_ref = JNIHandles::make_weak_global(old_method_h); |
| method_refs->append(method_ref); |
| if (++local_count >= emcp_method_count) { |
| // no more EMCP methods so bail out now |
| break; |
| } |
| } |
| } |
| // non-shared ConstantPool gets a weak reference |
| pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), method_refs); |
| } |
| |
| _previous_versions->append(pv_node); |
| |
| // Using weak references allows the interesting parts of previous |
| // classes to be GC'ed when they are no longer needed. Since the |
| // caller is the VMThread and we are at a safepoint, this is a good |
| // time to clear out unused weak references. |
| |
| RC_TRACE(0x00000400, ("add: previous version length=%d", |
| _previous_versions->length())); |
| |
| // skip the last entry since we just added it |
| for (int i = _previous_versions->length() - 2; i >= 0; i--) { |
| // check the previous versions array for a GC'ed weak refs |
| pv_node = _previous_versions->at(i); |
| cp_ref = pv_node->prev_constant_pool(); |
| assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
| if (cp_ref == NULL) { |
| delete pv_node; |
| _previous_versions->remove_at(i); |
| // Since we are traversing the array backwards, we don't have to |
| // do anything special with the index. |
| continue; // robustness |
| } |
| |
| constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); |
| if (cp == NULL) { |
| // this entry has been GC'ed so remove it |
| delete pv_node; |
| _previous_versions->remove_at(i); |
| // Since we are traversing the array backwards, we don't have to |
| // do anything special with the index. |
| continue; |
| } else { |
| RC_TRACE(0x00000400, ("add: previous version @%d is alive", i)); |
| } |
| |
| GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); |
| if (method_refs != NULL) { |
| RC_TRACE(0x00000400, ("add: previous methods length=%d", |
| method_refs->length())); |
| for (int j = method_refs->length() - 1; j >= 0; j--) { |
| jweak method_ref = method_refs->at(j); |
| assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); |
| if (method_ref == NULL) { |
| method_refs->remove_at(j); |
| // Since we are traversing the array backwards, we don't have to |
| // do anything special with the index. |
| continue; // robustness |
| } |
| |
| methodOop method = (methodOop)JNIHandles::resolve(method_ref); |
| if (method == NULL || emcp_method_count == 0) { |
| // This method entry has been GC'ed or the current |
| // RedefineClasses() call has made all methods obsolete |
| // so remove it. |
| JNIHandles::destroy_weak_global(method_ref); |
| method_refs->remove_at(j); |
| } else { |
| // RC_TRACE macro has an embedded ResourceMark |
| RC_TRACE(0x00000400, |
| ("add: %s(%s): previous method @%d in version @%d is alive", |
| method->name()->as_C_string(), method->signature()->as_C_string(), |
| j, i)); |
| } |
| } |
| } |
| } |
| |
| int obsolete_method_count = old_methods->length() - emcp_method_count; |
| |
| if (emcp_method_count != 0 && obsolete_method_count != 0 && |
| _previous_versions->length() > 1) { |
| // We have a mix of obsolete and EMCP methods. If there is more |
| // than the previous version that we just added, then we have to |
| // clear out any matching EMCP method entries the hard way. |
| int local_count = 0; |
| for (int i = 0; i < old_methods->length(); i++) { |
| if (!emcp_methods->at(i)) { |
| // only obsolete methods are interesting |
| methodOop old_method = (methodOop) old_methods->obj_at(i); |
| Symbol* m_name = old_method->name(); |
| Symbol* m_signature = old_method->signature(); |
| |
| // skip the last entry since we just added it |
| for (int j = _previous_versions->length() - 2; j >= 0; j--) { |
| // check the previous versions array for a GC'ed weak refs |
| pv_node = _previous_versions->at(j); |
| cp_ref = pv_node->prev_constant_pool(); |
| assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
| if (cp_ref == NULL) { |
| delete pv_node; |
| _previous_versions->remove_at(j); |
| // Since we are traversing the array backwards, we don't have to |
| // do anything special with the index. |
| continue; // robustness |
| } |
| |
| constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); |
| if (cp == NULL) { |
| // this entry has been GC'ed so remove it |
| delete pv_node; |
| _previous_versions->remove_at(j); |
| // Since we are traversing the array backwards, we don't have to |
| // do anything special with the index. |
| continue; |
| } |
| |
| GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); |
| if (method_refs == NULL) { |
| // We have run into a PreviousVersion generation where |
| // all methods were made obsolete during that generation's |
| // RedefineClasses() operation. At the time of that |
| // operation, all EMCP methods were flushed so we don't |
| // have to go back any further. |
| // |
| // A NULL method_refs is different than an empty method_refs. |
| // We cannot infer any optimizations about older generations |
| // from an empty method_refs for the current generation. |
| break; |
| } |
| |
| for (int k = method_refs->length() - 1; k >= 0; k--) { |
| jweak method_ref = method_refs->at(k); |
| assert(method_ref != NULL, |
| "weak method ref was unexpectedly cleared"); |
| if (method_ref == NULL) { |
| method_refs->remove_at(k); |
| // Since we are traversing the array backwards, we don't |
| // have to do anything special with the index. |
| continue; // robustness |
| } |
| |
| methodOop method = (methodOop)JNIHandles::resolve(method_ref); |
| if (method == NULL) { |
| // this method entry has been GC'ed so skip it |
| JNIHandles::destroy_weak_global(method_ref); |
| method_refs->remove_at(k); |
| continue; |
| } |
| |
| if (method->name() == m_name && |
| method->signature() == m_signature) { |
| // The current RedefineClasses() call has made all EMCP |
| // versions of this method obsolete so mark it as obsolete |
| // and remove the weak ref. |
| RC_TRACE(0x00000400, |
| ("add: %s(%s): flush obsolete method @%d in version @%d", |
| m_name->as_C_string(), m_signature->as_C_string(), k, j)); |
| |
| method->set_is_obsolete(); |
| JNIHandles::destroy_weak_global(method_ref); |
| method_refs->remove_at(k); |
| break; |
| } |
| } |
| |
| // The previous loop may not find a matching EMCP method, but |
| // that doesn't mean that we can optimize and not go any |
| // further back in the PreviousVersion generations. The EMCP |
| // method for this generation could have already been GC'ed, |
| // but there still may be an older EMCP method that has not |
| // been GC'ed. |
| } |
| |
| if (++local_count >= obsolete_method_count) { |
| // no more obsolete methods so bail out now |
| break; |
| } |
| } |
| } |
| } |
| } // end add_previous_version() |
| |
| |
| // Determine if instanceKlass has a previous version. |
| bool instanceKlass::has_previous_version() const { |
| if (_previous_versions == NULL) { |
| // no previous versions array so answer is easy |
| return false; |
| } |
| |
| for (int i = _previous_versions->length() - 1; i >= 0; i--) { |
| // Check the previous versions array for an info node that hasn't |
| // been GC'ed |
| PreviousVersionNode * pv_node = _previous_versions->at(i); |
| |
| jobject cp_ref = pv_node->prev_constant_pool(); |
| assert(cp_ref != NULL, "cp reference was unexpectedly cleared"); |
| if (cp_ref == NULL) { |
| continue; // robustness |
| } |
| |
| constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); |
| if (cp != NULL) { |
| // we have at least one previous version |
| return true; |
| } |
| |
| // We don't have to check the method refs. If the constant pool has |
| // been GC'ed then so have the methods. |
| } |
| |
| // all of the underlying nodes' info has been GC'ed |
| return false; |
| } // end has_previous_version() |
| |
| methodOop instanceKlass::method_with_idnum(int idnum) { |
| methodOop m = NULL; |
| if (idnum < methods()->length()) { |
| m = (methodOop) methods()->obj_at(idnum); |
| } |
| if (m == NULL || m->method_idnum() != idnum) { |
| for (int index = 0; index < methods()->length(); ++index) { |
| m = (methodOop) methods()->obj_at(index); |
| if (m->method_idnum() == idnum) { |
| return m; |
| } |
| } |
| } |
| return m; |
| } |
| |
| |
| // Set the annotation at 'idnum' to 'anno'. |
| // We don't want to create or extend the array if 'anno' is NULL, since that is the |
| // default value. However, if the array exists and is long enough, we must set NULL values. |
| void instanceKlass::set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p) { |
| objArrayOop md = *md_p; |
| if (md != NULL && md->length() > idnum) { |
| md->obj_at_put(idnum, anno); |
| } else if (anno != NULL) { |
| // create the array |
| int length = MAX2(idnum+1, (int)_idnum_allocated_count); |
| md = oopFactory::new_system_objArray(length, Thread::current()); |
| if (*md_p != NULL) { |
| // copy the existing entries |
| for (int index = 0; index < (*md_p)->length(); index++) { |
| md->obj_at_put(index, (*md_p)->obj_at(index)); |
| } |
| } |
| set_annotations(md, md_p); |
| md->obj_at_put(idnum, anno); |
| } // if no array and idnum isn't included there is nothing to do |
| } |
| |
| // Construct a PreviousVersionNode entry for the array hung off |
| // the instanceKlass. |
| PreviousVersionNode::PreviousVersionNode(jobject prev_constant_pool, |
| bool prev_cp_is_weak, GrowableArray<jweak>* prev_EMCP_methods) { |
| |
| _prev_constant_pool = prev_constant_pool; |
| _prev_cp_is_weak = prev_cp_is_weak; |
| _prev_EMCP_methods = prev_EMCP_methods; |
| } |
| |
| |
| // Destroy a PreviousVersionNode |
| PreviousVersionNode::~PreviousVersionNode() { |
| if (_prev_constant_pool != NULL) { |
| if (_prev_cp_is_weak) { |
| JNIHandles::destroy_weak_global(_prev_constant_pool); |
| } else { |
| JNIHandles::destroy_global(_prev_constant_pool); |
| } |
| } |
| |
| if (_prev_EMCP_methods != NULL) { |
| for (int i = _prev_EMCP_methods->length() - 1; i >= 0; i--) { |
| jweak method_ref = _prev_EMCP_methods->at(i); |
| if (method_ref != NULL) { |
| JNIHandles::destroy_weak_global(method_ref); |
| } |
| } |
| delete _prev_EMCP_methods; |
| } |
| } |
| |
| |
| // Construct a PreviousVersionInfo entry |
| PreviousVersionInfo::PreviousVersionInfo(PreviousVersionNode *pv_node) { |
| _prev_constant_pool_handle = constantPoolHandle(); // NULL handle |
| _prev_EMCP_method_handles = NULL; |
| |
| jobject cp_ref = pv_node->prev_constant_pool(); |
| assert(cp_ref != NULL, "constant pool ref was unexpectedly cleared"); |
| if (cp_ref == NULL) { |
| return; // robustness |
| } |
| |
| constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); |
| if (cp == NULL) { |
| // Weak reference has been GC'ed. Since the constant pool has been |
| // GC'ed, the methods have also been GC'ed. |
| return; |
| } |
| |
| // make the constantPoolOop safe to return |
| _prev_constant_pool_handle = constantPoolHandle(cp); |
| |
| GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); |
| if (method_refs == NULL) { |
| // the instanceKlass did not have any EMCP methods |
| return; |
| } |
| |
| _prev_EMCP_method_handles = new GrowableArray<methodHandle>(10); |
| |
| int n_methods = method_refs->length(); |
| for (int i = 0; i < n_methods; i++) { |
| jweak method_ref = method_refs->at(i); |
| assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); |
| if (method_ref == NULL) { |
| continue; // robustness |
| } |
| |
| methodOop method = (methodOop)JNIHandles::resolve(method_ref); |
| if (method == NULL) { |
| // this entry has been GC'ed so skip it |
| continue; |
| } |
| |
| // make the methodOop safe to return |
| _prev_EMCP_method_handles->append(methodHandle(method)); |
| } |
| } |
| |
| |
| // Destroy a PreviousVersionInfo |
| PreviousVersionInfo::~PreviousVersionInfo() { |
| // Since _prev_EMCP_method_handles is not C-heap allocated, we |
| // don't have to delete it. |
| } |
| |
| |
| // Construct a helper for walking the previous versions array |
| PreviousVersionWalker::PreviousVersionWalker(instanceKlass *ik) { |
| _previous_versions = ik->previous_versions(); |
| _current_index = 0; |
| // _hm needs no initialization |
| _current_p = NULL; |
| } |
| |
| |
| // Destroy a PreviousVersionWalker |
| PreviousVersionWalker::~PreviousVersionWalker() { |
| // Delete the current info just in case the caller didn't walk to |
| // the end of the previous versions list. No harm if _current_p is |
| // already NULL. |
| delete _current_p; |
| |
| // When _hm is destroyed, all the Handles returned in |
| // PreviousVersionInfo objects will be destroyed. |
| // Also, after this destructor is finished it will be |
| // safe to delete the GrowableArray allocated in the |
| // PreviousVersionInfo objects. |
| } |
| |
| |
| // Return the interesting information for the next previous version |
| // of the klass. Returns NULL if there are no more previous versions. |
| PreviousVersionInfo* PreviousVersionWalker::next_previous_version() { |
| if (_previous_versions == NULL) { |
| // no previous versions so nothing to return |
| return NULL; |
| } |
| |
| delete _current_p; // cleanup the previous info for the caller |
| _current_p = NULL; // reset to NULL so we don't delete same object twice |
| |
| int length = _previous_versions->length(); |
| |
| while (_current_index < length) { |
| PreviousVersionNode * pv_node = _previous_versions->at(_current_index++); |
| PreviousVersionInfo * pv_info = new (ResourceObj::C_HEAP) |
| PreviousVersionInfo(pv_node); |
| |
| constantPoolHandle cp_h = pv_info->prev_constant_pool_handle(); |
| if (cp_h.is_null()) { |
| delete pv_info; |
| |
| // The underlying node's info has been GC'ed so try the next one. |
| // We don't have to check the methods. If the constant pool has |
| // GC'ed then so have the methods. |
| continue; |
| } |
| |
| // Found a node with non GC'ed info so return it. The caller will |
| // need to delete pv_info when they are done with it. |
| _current_p = pv_info; |
| return pv_info; |
| } |
| |
| // all of the underlying nodes' info has been GC'ed |
| return NULL; |
| } // end next_previous_version() |