/* * Copyright (c) 1998, 2025, 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 "cds/aotConstantPoolResolver.hpp" #include "cds/archiveBuilder.hpp" #include "cds/cdsConfig.hpp" #include "cds/heapShared.hpp" #include "classfile/resolutionErrors.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/systemDictionaryShared.hpp" #include "classfile/vmClasses.hpp" #include "code/codeCache.hpp" #include "interpreter/bytecodeStream.hpp" #include "interpreter/bytecodes.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/linkResolver.hpp" #include "interpreter/rewriter.hpp" #include "logging/log.hpp" #include "logging/logStream.hpp" #include "memory/metadataFactory.hpp" #include "memory/metaspaceClosure.hpp" #include "memory/resourceArea.hpp" #include "oops/access.inline.hpp" #include "oops/compressedOops.hpp" #include "oops/constantPool.inline.hpp" #include "oops/cpCache.inline.hpp" #include "oops/method.inline.hpp" #include "oops/objArrayOop.inline.hpp" #include "oops/oop.inline.hpp" #include "oops/resolvedFieldEntry.hpp" #include "oops/resolvedIndyEntry.hpp" #include "oops/resolvedMethodEntry.hpp" #include "prims/methodHandles.hpp" #include "runtime/arguments.hpp" #include "runtime/atomic.hpp" #include "runtime/handles.inline.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/synchronizer.hpp" #include "runtime/vm_version.hpp" #include "utilities/macros.hpp" // Implementation of ConstantPoolCache template static Array* initialize_resolved_entries_array(ClassLoaderData* loader_data, GrowableArray entries, TRAPS) { Array* resolved_entries; if (entries.length() != 0) { resolved_entries = MetadataFactory::new_array(loader_data, entries.length(), CHECK_NULL); for (int i = 0; i < entries.length(); i++) { resolved_entries->at_put(i, entries.at(i)); } return resolved_entries; } return nullptr; } void ConstantPoolCache::set_direct_or_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int vtable_index, bool sender_is_interface) { bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean assert(method->interpreter_entry() != nullptr, "should have been set at this point"); assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); int byte_no = -1; bool change_to_virtual = false; InstanceKlass* holder = nullptr; // have to declare this outside the switch ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index); switch (invoke_code) { case Bytecodes::_invokeinterface: holder = method->method_holder(); // check for private interface method invocations if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) { assert(method->is_private(), "unexpected non-private method"); assert(method->can_be_statically_bound(), "unexpected non-statically-bound method"); method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) | ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift)); method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters()); assert(method_entry->is_vfinal(), "flags must be set"); method_entry->set_method(method()); byte_no = 2; method_entry->set_klass(holder); break; } else { // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface // instruction links to a non-interface method (in Object). This can happen when // an interface redeclares an Object method (like CharSequence declaring toString()) // or when invokeinterface is used explicitly. // In that case, the method has no itable index and must be invoked as a virtual. // Set a flag to keep track of this corner case. assert(holder->is_interface() || holder == vmClasses::Object_klass(), "unexpected holder class"); assert(method->is_public(), "Calling non-public method in Object with invokeinterface"); change_to_virtual = true; // ...and fall through as if we were handling invokevirtual: } case Bytecodes::_invokevirtual: { if (!is_vtable_call) { assert(method->can_be_statically_bound(), ""); method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) | ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift) | ((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift)); method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters()); assert(method_entry->is_vfinal(), "flags must be set"); method_entry->set_method(method()); } else { assert(!method->can_be_statically_bound(), ""); assert(vtable_index >= 0, "valid index"); assert(!method->is_final_method(), "sanity"); method_entry->set_flags((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift); method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters()); assert(!method_entry->is_vfinal(), "flags must not be set"); method_entry->set_table_index(vtable_index); } byte_no = 2; break; } case Bytecodes::_invokespecial: case Bytecodes::_invokestatic: { assert(!is_vtable_call, ""); // Note: Read and preserve the value of the is_vfinal flag on any // invokevirtual bytecode shared with this constant pool cache entry. // It is cheap and safe to consult is_vfinal() at all times. // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. bool vfinal = method_entry->is_vfinal(); method_entry->set_flags(((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift)); assert(vfinal == method_entry->is_vfinal(), "Vfinal flag must be preserved"); method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters()); method_entry->set_method(method()); byte_no = 1; break; } default: ShouldNotReachHere(); break; } // Note: byte_no also appears in TemplateTable::resolve. if (byte_no == 1) { assert(invoke_code != Bytecodes::_invokevirtual && invoke_code != Bytecodes::_invokeinterface, ""); bool do_resolve = true; // Don't mark invokespecial to method as resolved if sender is an interface. The receiver // has to be checked that it is a subclass of the current class every time this bytecode // is executed. if (invoke_code == Bytecodes::_invokespecial && sender_is_interface && method->name() != vmSymbols::object_initializer_name()) { do_resolve = false; } if (invoke_code == Bytecodes::_invokestatic) { assert(method->method_holder()->is_initialized() || method->method_holder()->is_reentrant_initialization(JavaThread::current()), "invalid class initialization state for invoke_static"); if (!VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) { // Don't mark invokestatic to method as resolved if the holder class has not yet completed // initialization. An invokestatic must only proceed if the class is initialized, but if // we resolve it before then that class initialization check is skipped. // // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true), // template interpreter supports fast class initialization check for // invokestatic which doesn't require call site re-resolution to // enforce class initialization barrier. do_resolve = false; } } if (do_resolve) { method_entry->set_bytecode1(invoke_code); } } else if (byte_no == 2) { if (change_to_virtual) { assert(invoke_code == Bytecodes::_invokeinterface, ""); // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! // // Workaround for the case where we encounter an invokeinterface, but we // should really have an _invokevirtual since the resolved method is a // virtual method in java.lang.Object. This is a corner case in the spec // but is presumably legal. javac does not generate this code. // // We do not set bytecode_1() to _invokeinterface, because that is the // bytecode # used by the interpreter to see if it is resolved. In this // case, the method gets reresolved with caller for each interface call // because the actual selected method may not be public. // // We set bytecode_2() to _invokevirtual. // See also interpreterRuntime.cpp. (8/25/2000) } else { assert(invoke_code == Bytecodes::_invokevirtual || (invoke_code == Bytecodes::_invokeinterface && ((method->is_private() || (method->is_final() && method->method_holder() == vmClasses::Object_klass())))), "unexpected invocation mode"); if (invoke_code == Bytecodes::_invokeinterface && (method->is_private() || method->is_final())) { // We set bytecode_1() to _invokeinterface, because that is the // bytecode # used by the interpreter to see if it is resolved. // We set bytecode_2() to _invokevirtual. method_entry->set_bytecode1(invoke_code); } } // set up for invokevirtual, even if linking for invokeinterface also: method_entry->set_bytecode2(Bytecodes::_invokevirtual); } else { ShouldNotReachHere(); } } void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, bool sender_is_interface) { int index = Method::nonvirtual_vtable_index; // index < 0; FIXME: inline and customize set_direct_or_vtable_call set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface); } void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) { // either the method is a miranda or its holder should accept the given index assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), ""); // index >= 0; FIXME: inline and customize set_direct_or_vtable_call set_direct_or_vtable_call(invoke_code, method_index, method, index, false); } void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code, int method_index, Klass* referenced_klass, const methodHandle& method, int index) { assert(method->method_holder()->verify_itable_index(index), ""); assert(invoke_code == Bytecodes::_invokeinterface, ""); InstanceKlass* interf = method->method_holder(); assert(interf->is_interface(), "must be an interface"); assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index); method_entry->set_klass(static_cast(referenced_klass)); method_entry->set_method(method()); method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters()); method_entry->set_bytecode1(Bytecodes::_invokeinterface); } ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) { // NOTE: This method entry can be the subject of data races. // There are three words to update: flags, refs[appendix_index], method (in that order). // Writers must store all other values before method. // Readers must test the method first for non-null before reading other fields. // Competing writers must acquire exclusive access via a lock. // A losing writer waits on the lock until the winner writes the method and leaves // the lock, so that when the losing writer returns, he can use the linked // cache entry. // Lock fields to write Bytecodes::Code invoke_code = Bytecodes::_invokehandle; JavaThread* current = JavaThread::current(); objArrayHandle resolved_references(current, constant_pool()->resolved_references()); // Use the resolved_references() lock for this cpCache entry. // resolved_references are created for all classes with Invokedynamic, MethodHandle // or MethodType constant pool cache entries. assert(resolved_references() != nullptr, "a resolved_references array should have been created for this class"); ObjectLocker ol(resolved_references, current); ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index); if (method_entry->is_resolved(invoke_code)) { return method_entry; } Method* adapter = call_info.resolved_method(); const Handle appendix = call_info.resolved_appendix(); const bool has_appendix = appendix.not_null(); // Write the flags. // MHs are always sig-poly and have a local signature. method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters()); method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) | ( 1 << ResolvedMethodEntry::has_local_signature_shift ) | ( 1 << ResolvedMethodEntry::is_final_shift )); // Method handle invokes use both a method and a resolved references index. // refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter. // In the general case, this could be the call site's MethodType, // for use with java.lang.Invokers.checkExactType, or else a CallSite object. // method_entry->method() contains the adapter method which manages the actual call. // In the general case, this is a compiled LambdaForm. // (The Java code is free to optimize these calls by binding other // sorts of methods and appendices to call sites.) // JVM-level linking is via the method, as if for invokespecial, and signatures are erased. // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. // Even with the appendix, the method will never take more than 255 parameter slots. // // This means that given a call site like (List)mh.invoke("foo"), // the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', // not '(Ljava/lang/String;)Ljava/util/List;'. // The fact that String and List are involved is encoded in the MethodType in refs[appendix_index]. // This allows us to create fewer Methods, while keeping type safety. // // Store appendix, if any. if (has_appendix) { const int appendix_index = method_entry->resolved_references_index(); assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once"); resolved_references->obj_at_put(appendix_index, appendix()); } method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)! // The interpreter assembly code does not check byte_2, // but it is used by is_resolved, method_if_resolved, etc. method_entry->set_bytecode1(invoke_code); assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag"); assert(method_entry->has_local_signature(), "proper storage of signature flag"); return method_entry; } Method* ConstantPoolCache::method_if_resolved(int method_index) const { // Decode the action of set_method and set_interface_call ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index); Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1(); switch (invoke_code) { case Bytecodes::_invokeinterface: case Bytecodes::_invokestatic: case Bytecodes::_invokespecial: assert(!method_entry->has_appendix(), ""); // fall through case Bytecodes::_invokehandle: return method_entry->method(); case Bytecodes::_invokedynamic: ShouldNotReachHere(); default: assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode"); break; } invoke_code = (Bytecodes::Code)method_entry->bytecode2(); if (invoke_code == Bytecodes::_invokevirtual) { if (method_entry->is_vfinal()) { return method_entry->method(); } else { int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index()); if (constant_pool()->tag_at(holder_index).is_klass()) { Klass* klass = constant_pool()->resolved_klass_at(holder_index); return klass->method_at_vtable(method_entry->table_index()); } } } return nullptr; } ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, const intStack& invokedynamic_map, const GrowableArray indy_entries, const GrowableArray field_entries, const GrowableArray method_entries, TRAPS) { int size = ConstantPoolCache::size(); // Initialize resolved entry arrays with available data Array* resolved_field_entries = initialize_resolved_entries_array(loader_data, field_entries, CHECK_NULL); Array* resolved_indy_entries = initialize_resolved_entries_array(loader_data, indy_entries, CHECK_NULL); Array* resolved_method_entries = initialize_resolved_entries_array(loader_data, method_entries, CHECK_NULL); return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD) ConstantPoolCache(invokedynamic_map, resolved_indy_entries, resolved_field_entries, resolved_method_entries); } // Record the GC marking cycle when redefined vs. when found in the loom stack chunks. void ConstantPoolCache::record_gc_epoch() { _gc_epoch = CodeCache::gc_epoch(); } #if INCLUDE_CDS void ConstantPoolCache::remove_unshareable_info() { assert(CDSConfig::is_dumping_archive(), "sanity"); if (_resolved_indy_entries != nullptr) { remove_resolved_indy_entries_if_non_deterministic(); } if (_resolved_field_entries != nullptr) { remove_resolved_field_entries_if_non_deterministic(); } if (_resolved_method_entries != nullptr) { remove_resolved_method_entries_if_non_deterministic(); } #if INCLUDE_CDS_JAVA_HEAP _archived_references_index = -1; if (CDSConfig::is_dumping_heap()) { ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(constant_pool()); oop rr = HeapShared::scratch_resolved_references(src_cp); if (rr != nullptr) { _archived_references_index = HeapShared::append_root(rr); } } #endif } void ConstantPoolCache::remove_resolved_field_entries_if_non_deterministic() { ConstantPool* cp = constant_pool(); ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp); for (int i = 0; i < _resolved_field_entries->length(); i++) { ResolvedFieldEntry* rfi = _resolved_field_entries->adr_at(i); int cp_index = rfi->constant_pool_index(); bool archived = false; bool resolved = rfi->is_resolved(Bytecodes::_getfield) || rfi->is_resolved(Bytecodes::_putfield); if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) { rfi->mark_and_relocate(); archived = true; } else { rfi->remove_unshareable_info(); } if (resolved) { LogStreamHandle(Trace, aot, resolve) log; if (log.is_enabled()) { ResourceMark rm; int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index); Symbol* klass_name = cp->klass_name_at(klass_cp_index); Symbol* name = cp->uncached_name_ref_at(cp_index); Symbol* signature = cp->uncached_signature_ref_at(cp_index); log.print("%s field CP entry [%3d]: %s => %s.%s:%s", (archived ? "archived" : "reverted"), cp_index, cp->pool_holder()->name()->as_C_string(), klass_name->as_C_string(), name->as_C_string(), signature->as_C_string()); } } ArchiveBuilder::alloc_stats()->record_field_cp_entry(archived, resolved && !archived); } } void ConstantPoolCache::remove_resolved_method_entries_if_non_deterministic() { ConstantPool* cp = constant_pool(); ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp); for (int i = 0; i < _resolved_method_entries->length(); i++) { ResolvedMethodEntry* rme = _resolved_method_entries->adr_at(i); int cp_index = rme->constant_pool_index(); bool archived = false; bool resolved = rme->is_resolved(Bytecodes::_invokevirtual) || rme->is_resolved(Bytecodes::_invokespecial) || rme->is_resolved(Bytecodes::_invokeinterface) || rme->is_resolved(Bytecodes::_invokehandle); // Just for safety -- this should not happen, but do not archive if we ever see this. resolved &= !(rme->is_resolved(Bytecodes::_invokestatic)); if (resolved && can_archive_resolved_method(src_cp, rme)) { rme->mark_and_relocate(src_cp); archived = true; } else { rme->remove_unshareable_info(); } if (resolved) { LogStreamHandle(Trace, aot, resolve) log; if (log.is_enabled()) { ResourceMark rm; int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index); Symbol* klass_name = cp->klass_name_at(klass_cp_index); Symbol* name = cp->uncached_name_ref_at(cp_index); Symbol* signature = cp->uncached_signature_ref_at(cp_index); log.print("%s%s method CP entry [%3d]: %s %s.%s:%s", (archived ? "archived" : "reverted"), (rme->is_resolved(Bytecodes::_invokeinterface) ? " interface" : ""), cp_index, cp->pool_holder()->name()->as_C_string(), klass_name->as_C_string(), name->as_C_string(), signature->as_C_string()); if (archived) { Klass* resolved_klass = cp->resolved_klass_at(klass_cp_index); log.print(" => %s%s", resolved_klass->name()->as_C_string(), (rme->is_resolved(Bytecodes::_invokestatic) ? " *** static" : "")); } } ArchiveBuilder::alloc_stats()->record_method_cp_entry(archived, resolved && !archived); } } } void ConstantPoolCache::remove_resolved_indy_entries_if_non_deterministic() { ConstantPool* cp = constant_pool(); ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp); for (int i = 0; i < _resolved_indy_entries->length(); i++) { ResolvedIndyEntry* rei = _resolved_indy_entries->adr_at(i); int cp_index = rei->constant_pool_index(); bool archived = false; bool resolved = rei->is_resolved(); if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) { rei->mark_and_relocate(); archived = true; } else { rei->remove_unshareable_info(); } if (resolved) { LogStreamHandle(Trace, aot, resolve) log; if (log.is_enabled()) { ResourceMark rm; int bsm = cp->bootstrap_method_ref_index_at(cp_index); int bsm_ref = cp->method_handle_index_at(bsm); Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref); Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref); Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref)); log.print("%s indy CP entry [%3d]: %s (%d)", (archived ? "archived" : "reverted"), cp_index, cp->pool_holder()->name()->as_C_string(), i); log.print(" %s %s.%s:%s", (archived ? "=>" : " "), bsm_klass->as_C_string(), bsm_name->as_C_string(), bsm_signature->as_C_string()); } ArchiveBuilder::alloc_stats()->record_indy_cp_entry(archived, resolved && !archived); } } } bool ConstantPoolCache::can_archive_resolved_method(ConstantPool* src_cp, ResolvedMethodEntry* method_entry) { InstanceKlass* pool_holder = constant_pool()->pool_holder(); if (pool_holder->defined_by_other_loaders()) { // Archiving resolved cp entries for classes from non-builtin loaders // is not yet supported. return false; } if (CDSConfig::is_dumping_dynamic_archive()) { // InstanceKlass::methods() has been resorted. We need to // update the vtable_index in method_entry (not implemented) return false; } if (!method_entry->is_resolved(Bytecodes::_invokevirtual)) { if (method_entry->method() == nullptr) { return false; } if (method_entry->method()->is_continuation_native_intrinsic()) { return false; // FIXME: corresponding stub is generated on demand during method resolution (see LinkResolver::resolve_static_call). } } int cp_index = method_entry->constant_pool_index(); assert(src_cp->tag_at(cp_index).is_method() || src_cp->tag_at(cp_index).is_interface_method(), "sanity"); if (!AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) { return false; } if (method_entry->is_resolved(Bytecodes::_invokeinterface) || method_entry->is_resolved(Bytecodes::_invokevirtual) || method_entry->is_resolved(Bytecodes::_invokespecial)) { return true; } else if (method_entry->is_resolved(Bytecodes::_invokehandle)) { if (CDSConfig::is_dumping_method_handles()) { // invokehandle depends on archived MethodType and LambdaForms. return true; } else { return false; } } else { return false; } } #endif // INCLUDE_CDS void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) { assert(!is_shared(), "shared caches are not deallocated"); data->remove_handle(_resolved_references); set_resolved_references(OopHandle()); MetadataFactory::free_array(data, _reference_map); set_reference_map(nullptr); #if INCLUDE_CDS if (_resolved_indy_entries != nullptr) { MetadataFactory::free_array(data, _resolved_indy_entries); _resolved_indy_entries = nullptr; } if (_resolved_field_entries != nullptr) { MetadataFactory::free_array(data, _resolved_field_entries); _resolved_field_entries = nullptr; } if (_resolved_method_entries != nullptr) { MetadataFactory::free_array(data, _resolved_method_entries); _resolved_method_entries = nullptr; } #endif } #if INCLUDE_CDS_JAVA_HEAP oop ConstantPoolCache::archived_references() { if (_archived_references_index < 0) { return nullptr; } return HeapShared::get_root(_archived_references_index); } void ConstantPoolCache::clear_archived_references() { if (_archived_references_index >= 0) { HeapShared::clear_root(_archived_references_index); _archived_references_index = -1; } } #endif #if INCLUDE_JVMTI static void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) { ResourceMark rm; if (!(*trace_name_printed)) { log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name()); *trace_name_printed = true; } log_trace(redefine, class, update, constantpool) ("cpc %s entry update: %s", entry_type, new_method->external_name()); } // RedefineClasses() API support: // If any entry of this ConstantPoolCache points to any of // old_methods, replace it with the corresponding new_method. void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) { if (_resolved_indy_entries != nullptr) { for (int j = 0; j < _resolved_indy_entries->length(); j++) { Method* old_method = resolved_indy_entry_at(j)->method(); if (old_method == nullptr || !old_method->is_old()) { continue; } assert(!old_method->is_deleted(), "cannot delete these methods"); Method* new_method = old_method->get_new_method(); resolved_indy_entry_at(j)->adjust_method_entry(new_method); log_adjust("indy", old_method, new_method, trace_name_printed); } } if (_resolved_method_entries != nullptr) { for (int i = 0; i < _resolved_method_entries->length(); i++) { ResolvedMethodEntry* method_entry = resolved_method_entry_at(i); // get interesting method entry Method* old_method = method_entry->method(); if (old_method == nullptr || !old_method->is_old()) { continue; // skip uninteresting entries } if (old_method->is_deleted()) { // clean up entries with deleted methods method_entry->reset_entry(); continue; } Method* new_method = old_method->get_new_method(); method_entry->adjust_method_entry(new_method); log_adjust("non-indy", old_method, new_method, trace_name_printed); } } } // the constant pool cache should never contain old or obsolete methods bool ConstantPoolCache::check_no_old_or_obsolete_entries() { ResourceMark rm; if (_resolved_indy_entries != nullptr) { for (int i = 0; i < _resolved_indy_entries->length(); i++) { Method* m = resolved_indy_entry_at(i)->method(); if (m != nullptr && !resolved_indy_entry_at(i)->check_no_old_or_obsolete_entry()) { log_trace(redefine, class, update, constantpool) ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s", constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name()); return false; } } } if (_resolved_method_entries != nullptr) { for (int i = 0; i < _resolved_method_entries->length(); i++) { ResolvedMethodEntry* method_entry = resolved_method_entry_at(i); Method* m = method_entry->method(); if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) { log_trace(redefine, class, update, constantpool) ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s", constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name()); return false; } } } return true; } void ConstantPoolCache::dump_cache() { print_on(tty); } #endif // INCLUDE_JVMTI void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) { log_trace(aot)("Iter(ConstantPoolCache): %p", this); it->push(&_constant_pool); it->push(&_reference_map); if (_resolved_indy_entries != nullptr) { it->push(&_resolved_indy_entries, MetaspaceClosure::_writable); } if (_resolved_field_entries != nullptr) { it->push(&_resolved_field_entries, MetaspaceClosure::_writable); } if (_resolved_method_entries != nullptr) { it->push(&_resolved_method_entries, MetaspaceClosure::_writable); } } bool ConstantPoolCache::save_and_throw_indy_exc( const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) { assert(HAS_PENDING_EXCEPTION, "No exception got thrown!"); assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()), "No LinkageError exception"); // Use the resolved_references() lock for this cpCache entry. // resolved_references are created for all classes with Invokedynamic, MethodHandle // or MethodType constant pool cache entries. JavaThread* current = THREAD; objArrayHandle resolved_references(current, cpool->resolved_references()); assert(resolved_references() != nullptr, "a resolved_references array should have been created for this class"); ObjectLocker ol(resolved_references, current); // if the indy_info is resolved or the indy_resolution_failed flag is set then another // thread either succeeded in resolving the method or got a LinkageError // exception, before this thread was able to record its failure. So, clear // this thread's exception and return false so caller can use the earlier // thread's result. if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) { CLEAR_PENDING_EXCEPTION; return false; } ResourceMark rm(THREAD); Symbol* error = PENDING_EXCEPTION->klass()->name(); const char* message = java_lang_Throwable::message_as_utf8(PENDING_EXCEPTION); int encoded_index = ResolutionErrorTable::encode_indy_index(index); SystemDictionary::add_resolution_error(cpool, encoded_index, error, message); resolved_indy_entry_at(index)->set_resolution_failed(); return true; } oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) { ResourceMark rm; // Use the resolved_references() lock for this cpCache entry. // resolved_references are created for all classes with Invokedynamic, MethodHandle // or MethodType constant pool cache entries. JavaThread* current = JavaThread::current(); constantPoolHandle cp(current, constant_pool()); objArrayHandle resolved_references(current, cp->resolved_references()); assert(resolved_references() != nullptr, "a resolved_references array should have been created for this class"); ObjectLocker ol(resolved_references, current); assert(index >= 0, "Indy index must be positive at this point"); if (resolved_indy_entry_at(index)->method() != nullptr) { return cp->resolved_reference_from_indy(index); } if (resolved_indy_entry_at(index)->resolution_failed()) { // Before we got here, another thread got a LinkageError exception during // resolution. Ignore our success and throw their exception. guarantee(index >= 0, "Invalid indy index"); int encoded_index = ResolutionErrorTable::encode_indy_index(index); ConstantPool::throw_resolution_error(cp, encoded_index, current); return nullptr; } Method* adapter = call_info.resolved_method(); const Handle appendix = call_info.resolved_appendix(); const bool has_appendix = appendix.not_null(); LogStream* log_stream = nullptr; LogStreamHandle(Debug, methodhandles, indy) lsh_indy; if (lsh_indy.is_enabled()) { ResourceMark rm; log_stream = &lsh_indy; log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ", 0xba, p2i(appendix()), (has_appendix ? "" : " (unused)"), p2i(adapter)); adapter->print_on(log_stream); if (has_appendix) appendix()->print_on(log_stream); } if (has_appendix) { const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index(); assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once"); resolved_references->obj_at_put(appendix_index, appendix()); } // Populate entry with resolved information assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information"); resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix); if (log_stream != nullptr) { resolved_indy_entry_at(index)->print_on(log_stream); } return appendix(); } oop ConstantPoolCache::appendix_if_resolved(int method_index) const { ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index); return appendix_if_resolved(method_entry); } oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const { if (!method_entry->has_appendix()) return nullptr; const int ref_index = method_entry->resolved_references_index(); return constant_pool()->resolved_reference_at(ref_index); } // Printing void ConstantPoolCache::print_on(outputStream* st) const { st->print_cr("%s", internal_name()); // print constant pool cache entries if (_resolved_field_entries != nullptr) { print_resolved_field_entries(st); } if (_resolved_method_entries != nullptr) { print_resolved_method_entries(st); } if (_resolved_indy_entries != nullptr) { print_resolved_indy_entries(st); } } void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const { for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) { resolved_field_entry_at(field_index)->print_on(st); } } void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const { for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) { ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index); method_entry->print_on(st); if (method_entry->has_appendix()) { st->print(" appendix: "); constant_pool()->resolved_reference_from_method(method_index)->print_on(st); } } } void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const { for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) { ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index); indy_entry->print_on(st); if (indy_entry->has_appendix()) { st->print(" appendix: "); constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st); } } }