/* * Copyright (c) 1997, 2018, 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 "jvm.h" #include "classfile/defaultMethods.hpp" #include "classfile/javaClasses.hpp" #include "classfile/resolutionErrors.hpp" #include "classfile/symbolTable.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "compiler/compileBroker.hpp" #include "gc/shared/collectedHeap.inline.hpp" #include "interpreter/bytecode.hpp" #include "interpreter/interpreterRuntime.hpp" #include "interpreter/linkResolver.hpp" #include "logging/log.hpp" #include "logging/logStream.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.hpp" #include "oops/cpCache.inline.hpp" #include "oops/instanceKlass.hpp" #include "oops/method.hpp" #include "oops/objArrayKlass.hpp" #include "oops/objArrayOop.hpp" #include "oops/oop.inline.hpp" #include "prims/methodHandles.hpp" #include "prims/nativeLookup.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/fieldDescriptor.hpp" #include "runtime/frame.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/reflection.hpp" #include "runtime/safepointVerifiers.hpp" #include "runtime/signature.hpp" #include "runtime/thread.inline.hpp" #include "runtime/vmThread.hpp" //------------------------------------------------------------------------------------------------------------------------ // Implementation of CallInfo void CallInfo::set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS) { int vtable_index = Method::nonvirtual_vtable_index; set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); } void CallInfo::set_interface(Klass* resolved_klass, Klass* selected_klass, const methodHandle& resolved_method, const methodHandle& selected_method, int itable_index, TRAPS) { // This is only called for interface methods. If the resolved_method // comes from java/lang/Object, it can be the subject of a virtual call, so // we should pick the vtable index from the resolved method. // In that case, the caller must call set_virtual instead of set_interface. assert(resolved_method->method_holder()->is_interface(), ""); assert(itable_index == resolved_method()->itable_index(), ""); set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK); } void CallInfo::set_virtual(Klass* resolved_klass, Klass* selected_klass, const methodHandle& resolved_method, const methodHandle& selected_method, int vtable_index, TRAPS) { assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index"); assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), ""); CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call); set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK); assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call"); } void CallInfo::set_handle(const methodHandle& resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS) { set_handle(SystemDictionary::MethodHandle_klass(), resolved_method, resolved_appendix, resolved_method_type, CHECK); } void CallInfo::set_handle(Klass* resolved_klass, const methodHandle& resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS) { if (resolved_method.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null"); } assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic || resolved_method->is_compiled_lambda_form(), "linkMethod must return one of these"); int vtable_index = Method::nonvirtual_vtable_index; assert(!resolved_method->has_vtable_index(), ""); set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK); _resolved_appendix = resolved_appendix; _resolved_method_type = resolved_method_type; } void CallInfo::set_common(Klass* resolved_klass, Klass* selected_klass, const methodHandle& resolved_method, const methodHandle& selected_method, CallKind kind, int index, TRAPS) { assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond"); _resolved_klass = resolved_klass; _selected_klass = selected_klass; _resolved_method = resolved_method; _selected_method = selected_method; _call_kind = kind; _call_index = index; _resolved_appendix = Handle(); DEBUG_ONLY(verify()); // verify before making side effects CompilationPolicy::compile_if_required(selected_method, THREAD); } // utility query for unreflecting a method CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) { Klass* resolved_method_holder = resolved_method->method_holder(); if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st resolved_klass = resolved_method_holder; } _resolved_klass = resolved_klass; _selected_klass = resolved_klass; _resolved_method = resolved_method; _selected_method = resolved_method; // classify: CallKind kind = CallInfo::unknown_kind; int index = resolved_method->vtable_index(); if (resolved_method->can_be_statically_bound()) { kind = CallInfo::direct_call; } else if (!resolved_method_holder->is_interface()) { // Could be an Object method inherited into an interface, but still a vtable call. kind = CallInfo::vtable_call; } else if (!resolved_klass->is_interface()) { // A default or miranda method. Compute the vtable index. index = LinkResolver::vtable_index_of_interface_method(resolved_klass, resolved_method); assert(index >= 0 , "we should have valid vtable index at this point"); kind = CallInfo::vtable_call; } else if (resolved_method->has_vtable_index()) { // Can occur if an interface redeclares a method of Object. #ifdef ASSERT // Ensure that this is really the case. Klass* object_klass = SystemDictionary::Object_klass(); Method * object_resolved_method = object_klass->vtable().method_at(index); assert(object_resolved_method->name() == resolved_method->name(), "Object and interface method names should match at vtable index %d, %s != %s", index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()); assert(object_resolved_method->signature() == resolved_method->signature(), "Object and interface method signatures should match at vtable index %d, %s != %s", index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()); #endif // ASSERT kind = CallInfo::vtable_call; } else { // A regular interface call. kind = CallInfo::itable_call; index = resolved_method->itable_index(); } assert(index == Method::nonvirtual_vtable_index || index >= 0, "bad index %d", index); _call_kind = kind; _call_index = index; _resolved_appendix = Handle(); // Find or create a ResolvedMethod instance for this Method* set_resolved_method_name(CHECK); DEBUG_ONLY(verify()); } void CallInfo::set_resolved_method_name(TRAPS) { Method* m = _resolved_method(); assert(m != NULL, "Should already have a Method*"); oop rmethod_name = java_lang_invoke_ResolvedMethodName::find_resolved_method(m, CHECK); _resolved_method_name = Handle(THREAD, rmethod_name); } #ifdef ASSERT void CallInfo::verify() { switch (call_kind()) { // the meaning and allowed value of index depends on kind case CallInfo::direct_call: if (_call_index == Method::nonvirtual_vtable_index) break; // else fall through to check vtable index: case CallInfo::vtable_call: assert(resolved_klass()->verify_vtable_index(_call_index), ""); break; case CallInfo::itable_call: assert(resolved_method()->method_holder()->verify_itable_index(_call_index), ""); break; case CallInfo::unknown_kind: assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set"); break; default: fatal("Unexpected call kind %d", call_kind()); } } #endif // ASSERT #ifndef PRODUCT void CallInfo::print() { ResourceMark rm; const char* kindstr; switch (_call_kind) { case direct_call: kindstr = "direct"; break; case vtable_call: kindstr = "vtable"; break; case itable_call: kindstr = "itable"; break; default : kindstr = "unknown"; break; } tty->print_cr("Call %s@%d %s", kindstr, _call_index, _resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string()); } #endif //------------------------------------------------------------------------------------------------------------------------ // Implementation of LinkInfo LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS) { // resolve klass _resolved_klass = pool->klass_ref_at(index, CHECK); // Get name, signature, and static klass _name = pool->name_ref_at(index); _signature = pool->signature_ref_at(index); _tag = pool->tag_ref_at(index); _current_klass = pool->pool_holder(); _current_method = current_method; // Coming from the constant pool always checks access _check_access = true; } LinkInfo::LinkInfo(const constantPoolHandle& pool, int index, TRAPS) { // resolve klass _resolved_klass = pool->klass_ref_at(index, CHECK); // Get name, signature, and static klass _name = pool->name_ref_at(index); _signature = pool->signature_ref_at(index); _tag = pool->tag_ref_at(index); _current_klass = pool->pool_holder(); _current_method = methodHandle(); // Coming from the constant pool always checks access _check_access = true; } char* LinkInfo::method_string() const { return Method::name_and_sig_as_C_string(_resolved_klass, _name, _signature); } #ifndef PRODUCT void LinkInfo::print() { ResourceMark rm; tty->print_cr("Link resolved_klass=%s name=%s signature=%s current_klass=%s check_access=%s", _resolved_klass->name()->as_C_string(), _name->as_C_string(), _signature->as_C_string(), _current_klass == NULL ? "(none)" : _current_klass->name()->as_C_string(), _check_access ? "true" : "false"); } #endif // PRODUCT //------------------------------------------------------------------------------------------------------------------------ // Klass resolution void LinkResolver::check_klass_accessability(Klass* ref_klass, Klass* sel_klass, bool fold_type_to_class, TRAPS) { Klass* base_klass = sel_klass; if (fold_type_to_class) { if (sel_klass->is_objArray_klass()) { base_klass = ObjArrayKlass::cast(sel_klass)->bottom_klass(); } // The element type could be a typeArray - we only need the access // check if it is a reference to another class. if (!base_klass->is_instance_klass()) { return; // no relevant check to do } } Reflection::VerifyClassAccessResults vca_result = Reflection::verify_class_access(ref_klass, InstanceKlass::cast(base_klass), true); if (vca_result != Reflection::ACCESS_OK) { ResourceMark rm(THREAD); char* msg = Reflection::verify_class_access_msg(ref_klass, InstanceKlass::cast(base_klass), vca_result); bool same_module = (base_klass->module() == ref_klass->module()); if (msg == NULL) { Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "failed to access class %s from class %s (%s%s%s)", base_klass->external_name(), ref_klass->external_name(), (same_module) ? base_klass->joint_in_module_of_loader(ref_klass) : base_klass->class_in_module_of_loader(), (same_module) ? "" : "; ", (same_module) ? "" : ref_klass->class_in_module_of_loader()); } else { // Use module specific message returned by verify_class_access_msg(). Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "%s", msg); } } } //------------------------------------------------------------------------------------------------------------------------ // Method resolution // // According to JVM spec. $5.4.3c & $5.4.3d // Look up method in klasses, including static methods // Then look up local default methods Method* LinkResolver::lookup_method_in_klasses(const LinkInfo& link_info, bool checkpolymorphism, bool in_imethod_resolve) { NoSafepointVerifier nsv; // Method* returned may not be reclaimed Klass* klass = link_info.resolved_klass(); Symbol* name = link_info.name(); Symbol* signature = link_info.signature(); // Ignore overpasses so statics can be found during resolution Method* result = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); if (klass->is_array_klass()) { // Only consider klass and super klass for arrays return result; } InstanceKlass* ik = InstanceKlass::cast(klass); // JDK 8, JVMS 5.4.3.4: Interface method resolution should // ignore static and non-public methods of java.lang.Object, // like clone, finalize, registerNatives. if (in_imethod_resolve && result != NULL && ik->is_interface() && (result->is_static() || !result->is_public()) && result->method_holder() == SystemDictionary::Object_klass()) { result = NULL; } // Before considering default methods, check for an overpass in the // current class if a method has not been found. if (result == NULL) { result = ik->find_method(name, signature); } if (result == NULL) { Array* default_methods = ik->default_methods(); if (default_methods != NULL) { result = InstanceKlass::find_method(default_methods, name, signature); } } if (checkpolymorphism && result != NULL) { vmIntrinsics::ID iid = result->intrinsic_id(); if (MethodHandles::is_signature_polymorphic(iid)) { // Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method. return NULL; } } return result; } // returns first instance method // Looks up method in classes, then looks up local default methods methodHandle LinkResolver::lookup_instance_method_in_klasses(Klass* klass, Symbol* name, Symbol* signature, Klass::PrivateLookupMode private_mode, TRAPS) { Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); while (result != NULL && result->is_static() && result->method_holder()->super() != NULL) { Klass* super_klass = result->method_holder()->super(); result = super_klass->uncached_lookup_method(name, signature, Klass::find_overpass, private_mode); } if (klass->is_array_klass()) { // Only consider klass and super klass for arrays return methodHandle(THREAD, result); } if (result == NULL) { Array* default_methods = InstanceKlass::cast(klass)->default_methods(); if (default_methods != NULL) { result = InstanceKlass::find_method(default_methods, name, signature); assert(result == NULL || !result->is_static(), "static defaults not allowed"); } } return methodHandle(THREAD, result); } int LinkResolver::vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method) { int vtable_index = Method::invalid_vtable_index; Symbol* name = resolved_method->name(); Symbol* signature = resolved_method->signature(); InstanceKlass* ik = InstanceKlass::cast(klass); // First check in default method array if (!resolved_method->is_abstract() && ik->default_methods() != NULL) { int index = InstanceKlass::find_method_index(ik->default_methods(), name, signature, Klass::find_overpass, Klass::find_static, Klass::find_private); if (index >= 0 ) { vtable_index = ik->default_vtable_indices()->at(index); } } if (vtable_index == Method::invalid_vtable_index) { // get vtable_index for miranda methods klassVtable vt = ik->vtable(); vtable_index = vt.index_of_miranda(name, signature); } return vtable_index; } Method* LinkResolver::lookup_method_in_interfaces(const LinkInfo& cp_info) { InstanceKlass *ik = InstanceKlass::cast(cp_info.resolved_klass()); // Specify 'true' in order to skip default methods when searching the // interfaces. Function lookup_method_in_klasses() already looked for // the method in the default methods table. return ik->lookup_method_in_all_interfaces(cp_info.name(), cp_info.signature(), Klass::skip_defaults); } methodHandle LinkResolver::lookup_polymorphic_method( const LinkInfo& link_info, Handle *appendix_result_or_null, Handle *method_type_result, TRAPS) { Klass* klass = link_info.resolved_klass(); Symbol* name = link_info.name(); Symbol* full_signature = link_info.signature(); vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name); if (TraceMethodHandles) { ResourceMark rm(THREAD); tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s", vmIntrinsics::name_at(iid), klass->external_name(), name->as_C_string(), full_signature->as_C_string()); } if ((klass == SystemDictionary::MethodHandle_klass() || klass == SystemDictionary::VarHandle_klass()) && iid != vmIntrinsics::_none) { if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) { // Most of these do not need an up-call to Java to resolve, so can be done anywhere. // Do not erase last argument type (MemberName) if it is a static linkTo method. bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid); TempNewSymbol basic_signature = MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK_NULL); if (TraceMethodHandles) { ResourceMark rm(THREAD); tty->print_cr("lookup_polymorphic_method %s %s => basic %s", name->as_C_string(), full_signature->as_C_string(), basic_signature->as_C_string()); } methodHandle result = SystemDictionary::find_method_handle_intrinsic(iid, basic_signature, CHECK_NULL); if (result.not_null()) { assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic"); assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this"); assert(basic_signature == result->signature(), "predict the result signature"); if (TraceMethodHandles) { ttyLocker ttyl; tty->print("lookup_polymorphic_method => intrinsic "); result->print_on(tty); } } return result; } else if (iid == vmIntrinsics::_invokeGeneric && THREAD->can_call_java() && appendix_result_or_null != NULL) { // This is a method with type-checking semantics. // We will ask Java code to spin an adapter method for it. if (!MethodHandles::enabled()) { // Make sure the Java part of the runtime has been booted up. Klass* natives = SystemDictionary::MethodHandleNatives_klass(); if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) { SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(), Handle(), Handle(), true, CHECK_NULL); } } Handle appendix; Handle method_type; methodHandle result = SystemDictionary::find_method_handle_invoker( klass, name, full_signature, link_info.current_klass(), &appendix, &method_type, CHECK_NULL); if (TraceMethodHandles) { ttyLocker ttyl; tty->print("lookup_polymorphic_method => (via Java) "); result->print_on(tty); tty->print(" lookup_polymorphic_method => appendix = "); if (appendix.is_null()) tty->print_cr("(none)"); else appendix->print_on(tty); } if (result.not_null()) { #ifdef ASSERT ResourceMark rm(THREAD); TempNewSymbol basic_signature = MethodHandles::lookup_basic_type_signature(full_signature, CHECK_NULL); int actual_size_of_params = result->size_of_parameters(); int expected_size_of_params = ArgumentSizeComputer(basic_signature).size(); // +1 for MethodHandle.this, +1 for trailing MethodType if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1; if (appendix.not_null()) expected_size_of_params += 1; if (actual_size_of_params != expected_size_of_params) { tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string()); tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid)); result->print(); } assert(actual_size_of_params == expected_size_of_params, "%d != %d", actual_size_of_params, expected_size_of_params); #endif //ASSERT assert(appendix_result_or_null != NULL, ""); (*appendix_result_or_null) = appendix; (*method_type_result) = method_type; } return result; } } return NULL; } void LinkResolver::check_method_accessability(Klass* ref_klass, Klass* resolved_klass, Klass* sel_klass, const methodHandle& sel_method, TRAPS) { AccessFlags flags = sel_method->access_flags(); // Special case: arrays always override "clone". JVMS 2.15. // If the resolved klass is an array class, and the declaring class // is java.lang.Object and the method is "clone", set the flags // to public. // // We'll check for the method name first, as that's most likely // to be false (so we'll short-circuit out of these tests). if (sel_method->name() == vmSymbols::clone_name() && sel_klass == SystemDictionary::Object_klass() && resolved_klass->is_array_klass()) { // We need to change "protected" to "public". assert(flags.is_protected(), "clone not protected?"); jint new_flags = flags.as_int(); new_flags = new_flags & (~JVM_ACC_PROTECTED); new_flags = new_flags | JVM_ACC_PUBLIC; flags.set_flags(new_flags); } // assert(extra_arg_result_or_null != NULL, "must be able to return extra argument"); bool can_access = Reflection::verify_member_access(ref_klass, resolved_klass, sel_klass, flags, true, false, CHECK); // Any existing exceptions that may have been thrown, for example LinkageErrors // from nest-host resolution, have been allowed to propagate. if (!can_access) { ResourceMark rm(THREAD); bool same_module = (sel_klass->module() == ref_klass->module()); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "class %s tried to access %s%s%smethod %s.%s%s (%s%s%s)", ref_klass->external_name(), sel_method->is_abstract() ? "abstract " : "", sel_method->is_protected() ? "protected " : "", sel_method->is_private() ? "private " : "", sel_klass->external_name(), sel_method->name()->as_C_string(), sel_method->signature()->as_C_string(), (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), (same_module) ? "" : "; ", (same_module) ? "" : sel_klass->class_in_module_of_loader() ); return; } } methodHandle LinkResolver::resolve_method_statically(Bytecodes::Code code, const constantPoolHandle& pool, int index, TRAPS) { // This method is used only // (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call), // and // (2) in Bytecode_invoke::static_target // It appears to fail when applied to an invokeinterface call site. // FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points. // resolve klass if (code == Bytecodes::_invokedynamic) { Klass* resolved_klass = SystemDictionary::MethodHandle_klass(); Symbol* method_name = vmSymbols::invoke_name(); Symbol* method_signature = pool->signature_ref_at(index); Klass* current_klass = pool->pool_holder(); LinkInfo link_info(resolved_klass, method_name, method_signature, current_klass); return resolve_method(link_info, code, THREAD); } LinkInfo link_info(pool, index, methodHandle(), CHECK_NULL); Klass* resolved_klass = link_info.resolved_klass(); if (pool->has_preresolution() || (resolved_klass == SystemDictionary::MethodHandle_klass() && MethodHandles::is_signature_polymorphic_name(resolved_klass, link_info.name()))) { Method* result = ConstantPool::method_at_if_loaded(pool, index); if (result != NULL) { return methodHandle(THREAD, result); } } if (code == Bytecodes::_invokeinterface) { return resolve_interface_method(link_info, code, THREAD); } else if (code == Bytecodes::_invokevirtual) { return resolve_method(link_info, code, THREAD); } else if (!resolved_klass->is_interface()) { return resolve_method(link_info, code, THREAD); } else { return resolve_interface_method(link_info, code, THREAD); } } // Check and print a loader constraint violation message for method or interface method void LinkResolver::check_method_loader_constraints(const LinkInfo& link_info, const methodHandle& resolved_method, const char* method_type, TRAPS) { Handle current_loader(THREAD, link_info.current_klass()->class_loader()); Handle resolved_loader(THREAD, resolved_method->method_holder()->class_loader()); ResourceMark rm(THREAD); Symbol* failed_type_symbol = SystemDictionary::check_signature_loaders(link_info.signature(), current_loader, resolved_loader, true, CHECK); if (failed_type_symbol != NULL) { const char* msg = "loader constraint violation: when resolving %s" " \"%s\" the class loader %s of the current class, %s," " and the class loader %s for the method's defining class, %s, have" " different Class objects for the type %s used in the signature"; char* sig = link_info.method_string(); const char* loader1_name = java_lang_ClassLoader::describe_external(current_loader()); char* current = link_info.current_klass()->name()->as_C_string(); const char* loader2_name = java_lang_ClassLoader::describe_external(resolved_loader()); char* target = resolved_method->method_holder()->name()->as_C_string(); char* failed_type_name = failed_type_symbol->as_C_string(); size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1_name) + strlen(current) + strlen(loader2_name) + strlen(target) + strlen(failed_type_name) + strlen(method_type) + 1; char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, method_type, sig, loader1_name, current, loader2_name, target, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } void LinkResolver::check_field_loader_constraints(Symbol* field, Symbol* sig, Klass* current_klass, Klass* sel_klass, TRAPS) { Handle ref_loader(THREAD, current_klass->class_loader()); Handle sel_loader(THREAD, sel_klass->class_loader()); ResourceMark rm(THREAD); // needed for check_signature_loaders Symbol* failed_type_symbol = SystemDictionary::check_signature_loaders(sig, ref_loader, sel_loader, false, CHECK); if (failed_type_symbol != NULL) { const char* msg = "loader constraint violation: when resolving field" " \"%s\" of type %s, the class loader %s of the current class, " "%s, and the class loader %s for the field's defining " "type, %s, have different Class objects for type %s"; const char* field_name = field->as_C_string(); const char* loader1_name = java_lang_ClassLoader::describe_external(ref_loader()); const char* sel = sel_klass->external_name(); const char* loader2_name = java_lang_ClassLoader::describe_external(sel_loader()); const char* failed_type_name = failed_type_symbol->as_klass_external_name(); const char* curr_klass_name = current_klass->external_name(); size_t buflen = strlen(msg) + strlen(field_name) + 2 * strlen(failed_type_name) + strlen(loader1_name) + strlen(curr_klass_name) + strlen(loader2_name) + strlen(sel) + 1; char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, field_name, failed_type_name, loader1_name, curr_klass_name, loader2_name, sel, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } methodHandle LinkResolver::resolve_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { Handle nested_exception; Klass* resolved_klass = link_info.resolved_klass(); // 1. For invokevirtual, cannot call an interface method if (code == Bytecodes::_invokevirtual && resolved_klass->is_interface()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected", resolved_klass->external_name()); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // 2. check constant pool tag for called method - must be JVM_CONSTANT_Methodref if (!link_info.tag().is_invalid() && !link_info.tag().is_method()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Method %s must be Methodref constant", link_info.method_string()); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // 3. lookup method in resolved klass and its super klasses methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, true, false)); // 4. lookup method in all the interfaces implemented by the resolved klass if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // not found in the class hierarchy resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); if (resolved_method.is_null()) { // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc resolved_method = lookup_polymorphic_method(link_info, (Handle*)NULL, (Handle*)NULL, THREAD); if (HAS_PENDING_EXCEPTION) { nested_exception = Handle(THREAD, PENDING_EXCEPTION); CLEAR_PENDING_EXCEPTION; } } } // 5. method lookup failed if (resolved_method.is_null()) { ResourceMark rm(THREAD); THROW_MSG_CAUSE_(vmSymbols::java_lang_NoSuchMethodError(), Method::name_and_sig_as_C_string(resolved_klass, link_info.name(), link_info.signature()), nested_exception, NULL); } // 6. access checks, access checking may be turned off when calling from within the VM. Klass* current_klass = link_info.current_klass(); if (link_info.check_access()) { assert(current_klass != NULL , "current_klass should not be null"); // check if method can be accessed by the referring class check_method_accessability(current_klass, resolved_klass, resolved_method->method_holder(), resolved_method, CHECK_NULL); // check loader constraints check_method_loader_constraints(link_info, resolved_method, "method", CHECK_NULL); } // For private method invocation we should only find the method in the resolved class. // If that is not the case then we have a found a supertype method that we have nestmate // access to. if (resolved_method->is_private() && resolved_method->method_holder() != resolved_klass) { ResourceMark rm(THREAD); DEBUG_ONLY(bool is_nestmate = InstanceKlass::cast(link_info.current_klass())->has_nestmate_access_to(InstanceKlass::cast(resolved_klass), THREAD);) assert(is_nestmate, "was only expecting nestmates to get here!"); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_NoSuchMethodError(), "%s: method %s%s not found", resolved_klass->external_name(), resolved_method->name()->as_C_string(), resolved_method->signature()->as_C_string() ); return NULL; } return resolved_method; } static void trace_method_resolution(const char* prefix, Klass* klass, Klass* resolved_klass, const methodHandle& method, bool logitables, int index = -1) { #ifndef PRODUCT ResourceMark rm; Log(itables) logi; LogStream lsi(logi.trace()); Log(vtables) logv; LogStream lsv(logv.trace()); outputStream* st; if (logitables) { st = &lsi; } else { st = &lsv; } st->print("%s%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", prefix, (klass == NULL ? "" : klass->internal_name()), (resolved_klass == NULL ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass, method->name(), method->signature()), method->method_holder()->internal_name()); method->print_linkage_flags(st); if (index != -1) { st->print("vtable_index:%d", index); } st->cr(); #endif // PRODUCT } // Do linktime resolution of a method in the interface within the context of the specied bytecode. methodHandle LinkResolver::resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS) { Klass* resolved_klass = link_info.resolved_klass(); // check if klass is interface if (!resolved_klass->is_interface()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass->external_name()); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // check constant pool tag for called method - must be JVM_CONSTANT_InterfaceMethodref if (!link_info.tag().is_invalid() && !link_info.tag().is_interface_method()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Method %s must be InterfaceMethodref constant", link_info.method_string()); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // lookup method in this interface or its super, java.lang.Object // JDK8: also look for static methods methodHandle resolved_method(THREAD, lookup_method_in_klasses(link_info, false, true)); if (resolved_method.is_null() && !resolved_klass->is_array_klass()) { // lookup method in all the super-interfaces resolved_method = methodHandle(THREAD, lookup_method_in_interfaces(link_info)); } if (resolved_method.is_null()) { // no method found ResourceMark rm(THREAD); THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), Method::name_and_sig_as_C_string(resolved_klass, link_info.name(), link_info.signature())); } if (link_info.check_access()) { // JDK8 adds non-public interface methods, and accessability check requirement Klass* current_klass = link_info.current_klass(); assert(current_klass != NULL , "current_klass should not be null"); // check if method can be accessed by the referring class check_method_accessability(current_klass, resolved_klass, resolved_method->method_holder(), resolved_method, CHECK_NULL); check_method_loader_constraints(link_info, resolved_method, "interface method", CHECK_NULL); } if (code != Bytecodes::_invokestatic && resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature())); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } if (log_develop_is_enabled(Trace, itables)) { char buf[200]; jio_snprintf(buf, sizeof(buf), "%s resolved interface method: caller-class:", Bytecodes::name(code)); trace_method_resolution(buf, link_info.current_klass(), resolved_klass, resolved_method, true); } return resolved_method; } //------------------------------------------------------------------------------------------------------------------------ // Field resolution void LinkResolver::check_field_accessability(Klass* ref_klass, Klass* resolved_klass, Klass* sel_klass, const fieldDescriptor& fd, TRAPS) { bool can_access = Reflection::verify_member_access(ref_klass, resolved_klass, sel_klass, fd.access_flags(), true, false, CHECK); // Any existing exceptions that may have been thrown, for example LinkageErrors // from nest-host resolution, have been allowed to propagate. if (!can_access) { bool same_module = (sel_klass->module() == ref_klass->module()); ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "class %s tried to access %s%sfield %s.%s (%s%s%s)", ref_klass->external_name(), fd.is_protected() ? "protected " : "", fd.is_private() ? "private " : "", sel_klass->external_name(), fd.name()->as_C_string(), (same_module) ? ref_klass->joint_in_module_of_loader(sel_klass) : ref_klass->class_in_module_of_loader(), (same_module) ? "" : "; ", (same_module) ? "" : sel_klass->class_in_module_of_loader() ); return; } } void LinkResolver::resolve_field_access(fieldDescriptor& fd, const constantPoolHandle& pool, int index, const methodHandle& method, Bytecodes::Code byte, TRAPS) { LinkInfo link_info(pool, index, method, CHECK); resolve_field(fd, link_info, byte, true, CHECK); } void LinkResolver::resolve_field(fieldDescriptor& fd, const LinkInfo& link_info, Bytecodes::Code byte, bool initialize_class, TRAPS) { assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_getfield || byte == Bytecodes::_nofast_putfield || (byte == Bytecodes::_nop && !link_info.check_access()), "bad field access bytecode"); bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic || byte == Bytecodes::_nofast_putfield); // Check if there's a resolved klass containing the field Klass* resolved_klass = link_info.resolved_klass(); Symbol* field = link_info.name(); Symbol* sig = link_info.signature(); if (resolved_klass == NULL) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); } // Resolve instance field Klass* sel_klass = resolved_klass->find_field(field, sig, &fd); // check if field exists; i.e., if a klass containing the field def has been selected if (sel_klass == NULL) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); } if (!link_info.check_access()) // Access checking may be turned off when calling from within the VM. return; // check access Klass* current_klass = link_info.current_klass(); check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK); // check for errors if (is_static != fd.is_static()) { ResourceMark rm(THREAD); char msg[200]; jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string()); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg); } // A final field can be modified only // (1) by methods declared in the class declaring the field and // (2) by the method (in case of a static field) // or by the method (in case of an instance field). if (is_put && fd.access_flags().is_final()) { ResourceMark rm(THREAD); stringStream ss; if (sel_klass != current_klass) { ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), current_klass->external_name()); THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); } if (fd.constants()->pool_holder()->major_version() >= 53) { methodHandle m = link_info.current_method(); assert(!m.is_null(), "information about the current method must be available for 'put' bytecodes"); bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic && fd.is_static() && !m()->is_static_initializer()); bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) && !fd.is_static() && !m->is_object_initializer()); if (is_initialized_static_final_update || is_initialized_instance_final_update) { ss.print("Update to %s final field %s.%s attempted from a different method (%s) than the initializer method %s ", is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(), m()->name()->as_C_string(), is_static ? "" : ""); THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), ss.as_string()); } } } // initialize resolved_klass if necessary // note 1: the klass which declared the field must be initialized (i.e, sel_klass) // according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99) // // note 2: we don't want to force initialization if we are just checking // if the field access is legal; e.g., during compilation if (is_static && initialize_class) { sel_klass->initialize(CHECK); } if (sel_klass != current_klass) { check_field_loader_constraints(field, sig, current_klass, sel_klass, CHECK); } // return information. note that the klass is set to the actual klass containing the // field, otherwise access of static fields in superclasses will not work. } //------------------------------------------------------------------------------------------------------------------------ // Invoke resolution // // Naming conventions: // // resolved_method the specified method (i.e., static receiver specified via constant pool index) // sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class) // resolved_klass the specified klass (i.e., specified via constant pool index) // recv_klass the receiver klass void LinkResolver::resolve_static_call(CallInfo& result, const LinkInfo& link_info, bool initialize_class, TRAPS) { methodHandle resolved_method = linktime_resolve_static_method(link_info, CHECK); // The resolved class can change as a result of this resolution. Klass* resolved_klass = resolved_method->method_holder(); // Initialize klass (this should only happen if everything is ok) if (initialize_class && resolved_klass->should_be_initialized()) { resolved_klass->initialize(CHECK); // Use updated LinkInfo to reresolve with resolved method holder LinkInfo new_info(resolved_klass, link_info.name(), link_info.signature(), link_info.current_klass(), link_info.check_access() ? LinkInfo::needs_access_check : LinkInfo::skip_access_check); resolved_method = linktime_resolve_static_method(new_info, CHECK); } // setup result result.set_static(resolved_klass, resolved_method, CHECK); } // throws linktime exceptions methodHandle LinkResolver::linktime_resolve_static_method(const LinkInfo& link_info, TRAPS) { Klass* resolved_klass = link_info.resolved_klass(); methodHandle resolved_method; if (!resolved_klass->is_interface()) { resolved_method = resolve_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); } else { resolved_method = resolve_interface_method(link_info, Bytecodes::_invokestatic, CHECK_NULL); } assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier"); // check if static if (!resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature())); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } return resolved_method; } void LinkResolver::resolve_special_call(CallInfo& result, Handle recv, const LinkInfo& link_info, TRAPS) { methodHandle resolved_method = linktime_resolve_special_method(link_info, CHECK); runtime_resolve_special_method(result, link_info, resolved_method, recv, CHECK); } // throws linktime exceptions methodHandle LinkResolver::linktime_resolve_special_method(const LinkInfo& link_info, TRAPS) { // Invokespecial is called for multiple special reasons: // // local private method invocation, for classes and interfaces // superclass.method, which can also resolve to a default method // and the selected method is recalculated relative to the direct superclass // superinterface.method, which explicitly does not check shadowing Klass* resolved_klass = link_info.resolved_klass(); methodHandle resolved_method; if (!resolved_klass->is_interface()) { resolved_method = resolve_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); } else { resolved_method = resolve_interface_method(link_info, Bytecodes::_invokespecial, CHECK_NULL); } // check if method name is , that it is found in same klass as static type if (resolved_method->name() == vmSymbols::object_initializer_name() && resolved_method->method_holder() != resolved_klass) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_NoSuchMethodError(), "%s: method %s%s not found", resolved_klass->external_name(), resolved_method->name()->as_C_string(), resolved_method->signature()->as_C_string() ); return NULL; } // ensure that invokespecial's interface method reference is in // a direct superinterface, not an indirect superinterface Klass* current_klass = link_info.current_klass(); if (current_klass != NULL && resolved_klass->is_interface()) { InstanceKlass* ck = InstanceKlass::cast(current_klass); InstanceKlass *klass_to_check = !ck->is_anonymous() ? ck : InstanceKlass::cast(ck->host_klass()); // Disable verification for the dynamically-generated reflection bytecodes. bool is_reflect = klass_to_check->is_subclass_of( SystemDictionary::reflect_MagicAccessorImpl_klass()); if (!is_reflect && !klass_to_check->is_same_or_direct_interface(resolved_klass)) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Interface method reference: %s, is in an indirect superinterface of %s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature()), current_klass->external_name()); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } } // check if not static if (resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature())); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } if (log_develop_is_enabled(Trace, itables)) { trace_method_resolution("invokespecial resolved method: caller-class:", current_klass, resolved_klass, resolved_method, true); } return resolved_method; } // throws runtime exceptions void LinkResolver::runtime_resolve_special_method(CallInfo& result, const LinkInfo& link_info, const methodHandle& resolved_method, Handle recv, TRAPS) { Klass* resolved_klass = link_info.resolved_klass(); // resolved method is selected method unless we have an old-style lookup // for a superclass method // Invokespecial for a superinterface, resolved method is selected method, // no checks for shadowing methodHandle sel_method(THREAD, resolved_method()); if (link_info.check_access() && // check if the method is not resolved_method->name() != vmSymbols::object_initializer_name()) { // check if this is an old-style super call and do a new lookup if so // a) check if ACC_SUPER flag is set for the current class Klass* current_klass = link_info.current_klass(); if ((current_klass->is_super() || !AllowNonVirtualCalls) && // b) check if the class of the resolved_klass is a superclass // (not supertype in order to exclude interface classes) of the current class. // This check is not performed for super.invoke for interface methods // in super interfaces. current_klass->is_subclass_of(resolved_klass) && current_klass != resolved_klass ) { // Lookup super method Klass* super_klass = current_klass->super(); sel_method = lookup_instance_method_in_klasses(super_klass, resolved_method->name(), resolved_method->signature(), Klass::find_private, CHECK); // check if found if (sel_method.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature())); // check loader constraints if found a different method } else if (sel_method() != resolved_method()) { check_method_loader_constraints(link_info, sel_method, "method", CHECK); } } // Check that the class of objectref (the receiver) is the current class or interface, // or a subtype of the current class or interface (the sender), otherwise invokespecial // throws IllegalAccessError. // The verifier checks that the sender is a subtype of the class in the I/MR operand. // The verifier also checks that the receiver is a subtype of the sender, if the sender is // a class. If the sender is an interface, the check has to be performed at runtime. InstanceKlass* sender = InstanceKlass::cast(current_klass); sender = sender->is_anonymous() ? sender->host_klass() : sender; if (sender->is_interface() && recv.not_null()) { Klass* receiver_klass = recv->klass(); if (!receiver_klass->is_subtype_of(sender)) { ResourceMark rm(THREAD); char buf[500]; jio_snprintf(buf, sizeof(buf), "Receiver class %s must be the current class or a subtype of interface %s", receiver_klass->name()->as_C_string(), sender->name()->as_C_string()); THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), buf); } } } // check if not static if (sel_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature())); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // check if abstract if (sel_method->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), Method::name_and_sig_as_C_string(resolved_klass, sel_method->name(), sel_method->signature())); } if (log_develop_is_enabled(Trace, itables)) { trace_method_resolution("invokespecial selected method: resolved-class:", resolved_klass, resolved_klass, sel_method, true); } // setup result result.set_static(resolved_klass, sel_method, CHECK); } void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, Klass* receiver_klass, const LinkInfo& link_info, bool check_null_and_abstract, TRAPS) { methodHandle resolved_method = linktime_resolve_virtual_method(link_info, CHECK); runtime_resolve_virtual_method(result, resolved_method, link_info.resolved_klass(), recv, receiver_klass, check_null_and_abstract, CHECK); } // throws linktime exceptions methodHandle LinkResolver::linktime_resolve_virtual_method(const LinkInfo& link_info, TRAPS) { // normal method resolution methodHandle resolved_method = resolve_method(link_info, Bytecodes::_invokevirtual, CHECK_NULL); assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); // check if private interface method Klass* resolved_klass = link_info.resolved_klass(); Klass* current_klass = link_info.current_klass(); // This is impossible, if resolve_klass is an interface, we've thrown icce in resolve_method if (resolved_klass->is_interface() && resolved_method->is_private()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature()), (current_klass == NULL ? "" : current_klass->internal_name())); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // check if not static if (resolved_method->is_static()) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass, resolved_method->name(), resolved_method->signature())); THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } if (log_develop_is_enabled(Trace, vtables)) { trace_method_resolution("invokevirtual resolved method: caller-class:", current_klass, resolved_klass, resolved_method, false); } return resolved_method; } // throws runtime exceptions void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, const methodHandle& resolved_method, Klass* resolved_klass, Handle recv, Klass* recv_klass, bool check_null_and_abstract, TRAPS) { // setup default return values int vtable_index = Method::invalid_vtable_index; methodHandle selected_method; // runtime method resolution if (check_null_and_abstract && recv.is_null()) { // check if receiver exists THROW(vmSymbols::java_lang_NullPointerException()); } // Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s // has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since // a missing receiver might result in a bogus lookup. assert(resolved_method->method_holder()->is_linked(), "must be linked"); // do lookup based on receiver klass using the vtable index if (resolved_method->method_holder()->is_interface()) { // default or miranda method vtable_index = vtable_index_of_interface_method(resolved_klass, resolved_method); assert(vtable_index >= 0 , "we should have valid vtable index at this point"); selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); } else { // at this point we are sure that resolved_method is virtual and not // a default or miranda method; therefore, it must have a valid vtable index. assert(!resolved_method->has_itable_index(), ""); vtable_index = resolved_method->vtable_index(); // We could get a negative vtable_index of nonvirtual_vtable_index for private // methods, or for final methods. Private methods never appear in the vtable // and never override other methods. As an optimization, final methods are // never put in the vtable, unless they override an existing method. // So if we do get nonvirtual_vtable_index, it means the selected method is the // resolved method, and it can never be changed by an override. if (vtable_index == Method::nonvirtual_vtable_index) { assert(resolved_method->can_be_statically_bound(), "cannot override this method"); selected_method = resolved_method; } else { selected_method = methodHandle(THREAD, recv_klass->method_at_vtable(vtable_index)); } } // check if method exists if (selected_method.is_null()) { throw_abstract_method_error(resolved_method, recv_klass, CHECK); } // check if abstract if (check_null_and_abstract && selected_method->is_abstract()) { // Pass arguments for generating a verbose error message. throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); } if (log_develop_is_enabled(Trace, vtables)) { trace_method_resolution("invokevirtual selected method: receiver-class:", recv_klass, resolved_klass, selected_method, false, vtable_index); } // setup result result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); } void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, const LinkInfo& link_info, bool check_null_and_abstract, TRAPS) { // throws linktime exceptions methodHandle resolved_method = linktime_resolve_interface_method(link_info, CHECK); runtime_resolve_interface_method(result, resolved_method,link_info.resolved_klass(), recv, recv_klass, check_null_and_abstract, CHECK); } methodHandle LinkResolver::linktime_resolve_interface_method(const LinkInfo& link_info, TRAPS) { // normal interface method resolution methodHandle resolved_method = resolve_interface_method(link_info, Bytecodes::_invokeinterface, CHECK_NULL); assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier"); assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier"); return resolved_method; } // throws runtime exceptions void LinkResolver::runtime_resolve_interface_method(CallInfo& result, const methodHandle& resolved_method, Klass* resolved_klass, Handle recv, Klass* recv_klass, bool check_null_and_abstract, TRAPS) { // check if receiver exists if (check_null_and_abstract && recv.is_null()) { THROW(vmSymbols::java_lang_NullPointerException()); } // check if receiver klass implements the resolved interface if (!recv_klass->is_subtype_of(resolved_klass)) { ResourceMark rm(THREAD); char buf[200]; jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s", recv_klass->external_name(), resolved_klass->external_name()); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } methodHandle selected_method = resolved_method; // resolve the method in the receiver class, unless it is private if (!resolved_method()->is_private()) { // do lookup based on receiver klass // This search must match the linktime preparation search for itable initialization // to correctly enforce loader constraints for interface method inheritance. // Private methods are skipped as the resolved method was not private. selected_method = lookup_instance_method_in_klasses(recv_klass, resolved_method->name(), resolved_method->signature(), Klass::skip_private, CHECK); if (selected_method.is_null() && !check_null_and_abstract) { // In theory this is a harmless placeholder value, but // in practice leaving in null affects the nsk default method tests. // This needs further study. selected_method = resolved_method; } // check if method exists if (selected_method.is_null()) { // Pass arguments for generating a verbose error message. throw_abstract_method_error(resolved_method, recv_klass, CHECK); } // check access // Throw Illegal Access Error if selected_method is not public. if (!selected_method->is_public()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), Method::name_and_sig_as_C_string(recv_klass, selected_method->name(), selected_method->signature())); } // check if abstract if (check_null_and_abstract && selected_method->is_abstract()) { throw_abstract_method_error(resolved_method, selected_method, recv_klass, CHECK); } } if (log_develop_is_enabled(Trace, itables)) { trace_method_resolution("invokeinterface selected method: receiver-class:", recv_klass, resolved_klass, selected_method, true); } // setup result if (resolved_method->has_vtable_index()) { int vtable_index = resolved_method->vtable_index(); log_develop_trace(itables)(" -- vtable index: %d", vtable_index); assert(vtable_index == selected_method->vtable_index(), "sanity check"); result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK); } else if (resolved_method->has_itable_index()) { int itable_index = resolved_method()->itable_index(); log_develop_trace(itables)(" -- itable index: %d", itable_index); result.set_interface(resolved_klass, recv_klass, resolved_method, selected_method, itable_index, CHECK); } else { int index = resolved_method->vtable_index(); log_develop_trace(itables)(" -- non itable/vtable index: %d", index); assert(index == Method::nonvirtual_vtable_index, "Oops hit another case!"); assert(resolved_method()->is_private() || (resolved_method()->is_final() && resolved_method->method_holder() == SystemDictionary::Object_klass()), "Should only have non-virtual invokeinterface for private or final-Object methods!"); assert(resolved_method()->can_be_statically_bound(), "Should only have non-virtual invokeinterface for statically bound methods!"); // This sets up the nonvirtual form of "virtual" call (as needed for final and private methods) result.set_virtual(resolved_klass, resolved_klass, resolved_method, resolved_method, index, CHECK); } } methodHandle LinkResolver::linktime_resolve_interface_method_or_null( const LinkInfo& link_info) { EXCEPTION_MARK; methodHandle method_result = linktime_resolve_interface_method(link_info, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } else { return method_result; } } methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( const LinkInfo& link_info) { EXCEPTION_MARK; methodHandle method_result = linktime_resolve_virtual_method(link_info, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } else { return method_result; } } methodHandle LinkResolver::resolve_virtual_call_or_null( Klass* receiver_klass, const LinkInfo& link_info) { EXCEPTION_MARK; CallInfo info; resolve_virtual_call(info, Handle(), receiver_klass, link_info, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } methodHandle LinkResolver::resolve_interface_call_or_null( Klass* receiver_klass, const LinkInfo& link_info) { EXCEPTION_MARK; CallInfo info; resolve_interface_call(info, Handle(), receiver_klass, link_info, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } int LinkResolver::resolve_virtual_vtable_index(Klass* receiver_klass, const LinkInfo& link_info) { EXCEPTION_MARK; CallInfo info; resolve_virtual_call(info, Handle(), receiver_klass, link_info, /*check_null_or_abstract*/false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return Method::invalid_vtable_index; } return info.vtable_index(); } methodHandle LinkResolver::resolve_static_call_or_null(const LinkInfo& link_info) { EXCEPTION_MARK; CallInfo info; resolve_static_call(info, link_info, /*initialize_class*/false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } methodHandle LinkResolver::resolve_special_call_or_null(const LinkInfo& link_info) { EXCEPTION_MARK; CallInfo info; resolve_special_call(info, Handle(), link_info, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } //------------------------------------------------------------------------------------------------------------------------ // ConstantPool entries void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, Bytecodes::Code byte, TRAPS) { switch (byte) { case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break; case Bytecodes::_invokespecial : resolve_invokespecial (result, recv, pool, index, CHECK); break; case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break; case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break; case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break; case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break; default : break; } return; } void LinkResolver::resolve_invoke(CallInfo& result, Handle& recv, const methodHandle& attached_method, Bytecodes::Code byte, TRAPS) { Klass* defc = attached_method->method_holder(); Symbol* name = attached_method->name(); Symbol* type = attached_method->signature(); LinkInfo link_info(defc, name, type); switch(byte) { case Bytecodes::_invokevirtual: resolve_virtual_call(result, recv, recv->klass(), link_info, /*check_null_and_abstract=*/true, CHECK); break; case Bytecodes::_invokeinterface: resolve_interface_call(result, recv, recv->klass(), link_info, /*check_null_and_abstract=*/true, CHECK); break; case Bytecodes::_invokestatic: resolve_static_call(result, link_info, /*initialize_class=*/false, CHECK); break; case Bytecodes::_invokespecial: resolve_special_call(result, recv, link_info, CHECK); break; default: fatal("bad call: %s", Bytecodes::name(byte)); break; } } void LinkResolver::resolve_invokestatic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { LinkInfo link_info(pool, index, CHECK); resolve_static_call(result, link_info, /*initialize_class*/true, CHECK); } void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { LinkInfo link_info(pool, index, CHECK); resolve_special_call(result, recv, link_info, CHECK); } void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { LinkInfo link_info(pool, index, CHECK); Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); resolve_virtual_call(result, recv, recvrKlass, link_info, /*check_null_or_abstract*/true, CHECK); } void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, const constantPoolHandle& pool, int index, TRAPS) { LinkInfo link_info(pool, index, CHECK); Klass* recvrKlass = recv.is_null() ? (Klass*)NULL : recv->klass(); resolve_interface_call(result, recv, recvrKlass, link_info, true, CHECK); } void LinkResolver::resolve_invokehandle(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { // This guy is reached from InterpreterRuntime::resolve_invokehandle. LinkInfo link_info(pool, index, CHECK); if (TraceMethodHandles) { ResourceMark rm(THREAD); tty->print_cr("resolve_invokehandle %s %s", link_info.name()->as_C_string(), link_info.signature()->as_C_string()); } resolve_handle_call(result, link_info, CHECK); } void LinkResolver::resolve_handle_call(CallInfo& result, const LinkInfo& link_info, TRAPS) { // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar Klass* resolved_klass = link_info.resolved_klass(); assert(resolved_klass == SystemDictionary::MethodHandle_klass() || resolved_klass == SystemDictionary::VarHandle_klass(), ""); assert(MethodHandles::is_signature_polymorphic_name(link_info.name()), ""); Handle resolved_appendix; Handle resolved_method_type; methodHandle resolved_method = lookup_polymorphic_method(link_info, &resolved_appendix, &resolved_method_type, CHECK); result.set_handle(resolved_klass, resolved_method, resolved_appendix, resolved_method_type, CHECK); } void LinkResolver::resolve_invokedynamic(CallInfo& result, const constantPoolHandle& pool, int index, TRAPS) { Symbol* method_name = pool->name_ref_at(index); Symbol* method_signature = pool->signature_ref_at(index); Klass* current_klass = pool->pool_holder(); // Resolve the bootstrap specifier (BSM + optional arguments). Handle bootstrap_specifier; // Check if CallSite has been bound already: ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); int pool_index = cpce->constant_pool_index(); if (cpce->is_f1_null()) { if (cpce->indy_resolution_failed()) { ConstantPool::throw_resolution_error(pool, ResolutionErrorTable::encode_cpcache_index(index), CHECK); } // The initial step in Call Site Specifier Resolution is to resolve the symbolic // reference to a method handle which will be the bootstrap method for a dynamic // call site. If resolution for the java.lang.invoke.MethodHandle for the bootstrap // method fails, then a MethodHandleInError is stored at the corresponding bootstrap // method's CP index for the CONSTANT_MethodHandle_info. So, there is no need to // set the indy_rf flag since any subsequent invokedynamic instruction which shares // this bootstrap method will encounter the resolution of MethodHandleInError. oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); Exceptions::wrap_dynamic_exception(CHECK); assert(bsm_info != NULL, ""); // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic. bootstrap_specifier = Handle(THREAD, bsm_info); } if (!cpce->is_f1_null()) { methodHandle method( THREAD, cpce->f1_as_method()); Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); result.set_handle(method, appendix, method_type, THREAD); Exceptions::wrap_dynamic_exception(CHECK); return; } if (TraceMethodHandles) { ResourceMark rm(THREAD); tty->print_cr("resolve_invokedynamic #%d %s %s in %s", ConstantPool::decode_invokedynamic_index(index), method_name->as_C_string(), method_signature->as_C_string(), current_klass->name()->as_C_string()); tty->print(" BSM info: "); bootstrap_specifier->print(); } resolve_dynamic_call(result, pool_index, bootstrap_specifier, method_name, method_signature, current_klass, THREAD); if (HAS_PENDING_EXCEPTION && PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { int encoded_index = ResolutionErrorTable::encode_cpcache_index(index); bool recorded_res_status = cpce->save_and_throw_indy_exc(pool, pool_index, encoded_index, pool()->tag_at(pool_index), CHECK); if (!recorded_res_status) { // Another thread got here just before we did. So, either use the method // that it resolved or throw the LinkageError exception that it threw. if (!cpce->is_f1_null()) { methodHandle method( THREAD, cpce->f1_as_method()); Handle appendix( THREAD, cpce->appendix_if_resolved(pool)); Handle method_type(THREAD, cpce->method_type_if_resolved(pool)); result.set_handle(method, appendix, method_type, THREAD); Exceptions::wrap_dynamic_exception(CHECK); } else { assert(cpce->indy_resolution_failed(), "Resolution failure flag not set"); ConstantPool::throw_resolution_error(pool, encoded_index, CHECK); } return; } assert(cpce->indy_resolution_failed(), "Resolution failure flag wasn't set"); } } void LinkResolver::resolve_dynamic_call(CallInfo& result, int pool_index, Handle bootstrap_specifier, Symbol* method_name, Symbol* method_signature, Klass* current_klass, TRAPS) { // JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...) // The appendix argument is likely to be a freshly-created CallSite. Handle resolved_appendix; Handle resolved_method_type; methodHandle resolved_method = SystemDictionary::find_dynamic_call_site_invoker(current_klass, pool_index, bootstrap_specifier, method_name, method_signature, &resolved_appendix, &resolved_method_type, THREAD); Exceptions::wrap_dynamic_exception(CHECK); result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); Exceptions::wrap_dynamic_exception(CHECK); } // Selected method is abstract. void LinkResolver::throw_abstract_method_error(const methodHandle& resolved_method, const methodHandle& selected_method, Klass *recv_klass, TRAPS) { Klass *resolved_klass = resolved_method->method_holder(); ResourceMark rm(THREAD); stringStream ss; if (recv_klass != NULL) { ss.print("Receiver class %s does not define or inherit an " "implementation of the", recv_klass->external_name()); } else { ss.print("Missing implementation of"); } assert(resolved_method.not_null(), "Sanity"); ss.print(" resolved method %s%s%s%s of %s %s.", resolved_method->is_abstract() ? "abstract " : "", resolved_method->is_private() ? "private " : "", resolved_method->name()->as_C_string(), resolved_method->signature()->as_C_string(), resolved_klass->external_kind(), resolved_klass->external_name()); if (selected_method.not_null() && !(resolved_method == selected_method)) { ss.print(" Selected method is %s%s%s.", selected_method->is_abstract() ? "abstract " : "", selected_method->is_private() ? "private " : "", selected_method->name_and_sig_as_C_string()); } THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); }