/* * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/defaultMethods.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "compiler/compileBroker.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "interpreter/bytecode.hpp" #include "interpreter/interpreterRuntime.hpp" #include "interpreter/linkResolver.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.inline.hpp" #include "oops/instanceKlass.hpp" #include "oops/objArrayOop.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/signature.hpp" #include "runtime/thread.inline.hpp" #include "runtime/vmThread.hpp" //------------------------------------------------------------------------------------------------------------------------ // Implementation of CallInfo void CallInfo::set_static(KlassHandle resolved_klass, 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(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, 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(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, 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(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"); } KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass(); 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(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, 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 if (CompilationPolicy::must_be_compiled(selected_method)) { // This path is unusual, mostly used by the '-Xcomp' stress test mode. // Note: with several active threads, the must_be_compiled may be true // while can_be_compiled is false; remove assert // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile"); if (THREAD->is_Compiler_thread()) { // don't force compilation, resolve was on behalf of compiler return; } if (selected_method->method_holder()->is_not_initialized()) { // 'is_not_initialized' means not only '!is_initialized', but also that // initialization has not been started yet ('!being_initialized') // Do not force compilation of methods in uninitialized classes. // Note that doing this would throw an assert later, // in CompileBroker::compile_method. // We sometimes use the link resolver to do reflective lookups // even before classes are initialized. return; } CompileBroker::compile_method(selected_method, InvocationEntryBci, CompilationPolicy::policy()->initial_compile_level(), methodHandle(), 0, "must_be_compiled", CHECK); } } // utility query for unreflecting a method CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) { 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. ResourceMark rm; klassVtable* vt = InstanceKlass::cast(resolved_klass)->vtable(); 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. KlassHandle object_klass = SystemDictionary::Object_klass(); Method * object_resolved_method = object_klass()->vtable()->method_at(index); assert(object_resolved_method->name() == resolved_method->name(), err_msg("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(), err_msg("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, err_msg("bad index %d", index)); _call_kind = kind; _call_index = index; _resolved_appendix = Handle(); DEBUG_ONLY(verify()); } #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(err_msg_res("Unexpected call kind %d", call_kind())); } } #endif //ASSERT //------------------------------------------------------------------------------------------------------------------------ // Klass resolution void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) { if (!Reflection::verify_class_access(ref_klass(), sel_klass(), true)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "tried to access class %s from class %s", sel_klass->external_name(), ref_klass->external_name() ); return; } } void LinkResolver::resolve_klass(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) { Klass* result_oop = pool->klass_ref_at(index, CHECK); result = KlassHandle(THREAD, result_oop); } //------------------------------------------------------------------------------------------------------------------------ // 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 void LinkResolver::lookup_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, bool checkpolymorphism, bool in_imethod_resolve, TRAPS) { // Ignore overpasses so statics can be found during resolution Method* result_oop = klass->uncached_lookup_method(name, signature, Klass::skip_overpass); if (klass->oop_is_array()) { // Only consider klass and super klass for arrays result = methodHandle(THREAD, result_oop); return; } // 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_oop != NULL && klass->is_interface() && (result_oop->is_static() || !result_oop->is_public()) && result_oop->method_holder() == SystemDictionary::Object_klass()) { result_oop = NULL; } // Before considering default methods, check for an overpass in the // current class if a method has not been found. if (result_oop == NULL) { result_oop = InstanceKlass::cast(klass())->find_method(name, signature); } if (result_oop == NULL) { Array* default_methods = InstanceKlass::cast(klass())->default_methods(); if (default_methods != NULL) { result_oop = InstanceKlass::find_method(default_methods, name, signature); } } if (checkpolymorphism && EnableInvokeDynamic && result_oop != NULL) { vmIntrinsics::ID iid = result_oop->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; } } result = methodHandle(THREAD, result_oop); } // returns first instance method // Looks up method in classes, then looks up local default methods void LinkResolver::lookup_instance_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { Method* result_oop = klass->uncached_lookup_method(name, signature, Klass::find_overpass); result = methodHandle(THREAD, result_oop); while (!result.is_null() && result->is_static() && result->method_holder()->super() != NULL) { KlassHandle super_klass = KlassHandle(THREAD, result->method_holder()->super()); result = methodHandle(THREAD, super_klass->uncached_lookup_method(name, signature, Klass::find_overpass)); } if (klass->oop_is_array()) { // Only consider klass and super klass for arrays return; } if (result.is_null()) { Array* default_methods = InstanceKlass::cast(klass())->default_methods(); if (default_methods != NULL) { result = methodHandle(InstanceKlass::find_method(default_methods, name, signature)); assert(result.is_null() || !result->is_static(), "static defaults not allowed"); } } } int LinkResolver::vtable_index_of_interface_method(KlassHandle klass, methodHandle resolved_method) { int vtable_index = Method::invalid_vtable_index; Symbol* name = resolved_method->name(); Symbol* signature = resolved_method->signature(); // First check in default method array if (!resolved_method->is_abstract() && (InstanceKlass::cast(klass())->default_methods() != NULL)) { int index = InstanceKlass::find_method_index(InstanceKlass::cast(klass())->default_methods(), name, signature, Klass::find_overpass, Klass::find_static, Klass::find_private); if (index >= 0 ) { vtable_index = InstanceKlass::cast(klass())->default_vtable_indices()->at(index); } } if (vtable_index == Method::invalid_vtable_index) { // get vtable_index for miranda methods ResourceMark rm; klassVtable *vt = InstanceKlass::cast(klass())->vtable(); vtable_index = vt->index_of_miranda(name, signature); } return vtable_index; } void LinkResolver::lookup_method_in_interfaces(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { InstanceKlass *ik = InstanceKlass::cast(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. result = methodHandle(THREAD, ik->lookup_method_in_all_interfaces(name, signature, Klass::skip_defaults)); } void LinkResolver::lookup_polymorphic_method(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* full_signature, KlassHandle current_klass, Handle *appendix_result_or_null, Handle *method_type_result, TRAPS) { 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 (EnableInvokeDynamic && klass() == SystemDictionary::MethodHandle_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); 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()); } result = SystemDictionary::find_method_handle_intrinsic(iid, basic_signature, CHECK); 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) { tty->print("lookup_polymorphic_method => intrinsic "); result->print_on(tty); } return; } } else if (iid == vmIntrinsics::_invokeGeneric && !THREAD->is_Compiler_thread() && 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); } } Handle appendix; Handle method_type; result = SystemDictionary::find_method_handle_invoker(name, full_signature, current_klass, &appendix, &method_type, CHECK); if (TraceMethodHandles) { 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); 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, err_msg("%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; } } } } void LinkResolver::check_method_accessability(KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, 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->oop_is_array()) { // 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"); if (!Reflection::verify_field_access(ref_klass(), resolved_klass(), sel_klass(), flags, true)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "tried to access method %s.%s%s from class %s", sel_klass->external_name(), sel_method->name()->as_C_string(), sel_method->signature()->as_C_string(), ref_klass->external_name() ); return; } } void LinkResolver::resolve_method_statically(methodHandle& resolved_method, KlassHandle& resolved_klass, Bytecodes::Code code, 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) { resolved_klass = SystemDictionary::MethodHandle_klass(); Symbol* method_name = vmSymbols::invoke_name(); Symbol* method_signature = pool->signature_ref_at(index); KlassHandle current_klass(THREAD, pool->pool_holder()); resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, false, CHECK); return; } resolve_klass(resolved_klass, pool, index, CHECK); Symbol* method_name = pool->name_ref_at(index); Symbol* method_signature = pool->signature_ref_at(index); KlassHandle current_klass(THREAD, pool->pool_holder()); if (pool->has_preresolution() || (resolved_klass() == SystemDictionary::MethodHandle_klass() && MethodHandles::is_signature_polymorphic_name(resolved_klass(), method_name))) { Method* result_oop = ConstantPool::method_at_if_loaded(pool, index); if (result_oop != NULL) { resolved_method = methodHandle(THREAD, result_oop); return; } } if (code == Bytecodes::_invokeinterface) { resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } else if (code == Bytecodes::_invokevirtual) { resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } else if (!resolved_klass->is_interface()) { resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, false, CHECK); } else { bool nostatics = (code == Bytecodes::_invokestatic) ? false : true; resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, nostatics, CHECK); } } void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool require_methodref, TRAPS) { Handle nested_exception; // 1. check if methodref required, that resolved_klass is not interfacemethodref if (require_methodref && 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(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // 2. lookup method in resolved klass and its super klasses lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, true, false, CHECK); if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy // 3. lookup method in all the interfaces implemented by the resolved klass lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK); if (resolved_method.is_null()) { // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, (Handle*)NULL, (Handle*)NULL, THREAD); if (HAS_PENDING_EXCEPTION) { nested_exception = Handle(THREAD, PENDING_EXCEPTION); CLEAR_PENDING_EXCEPTION; } } } if (resolved_method.is_null()) { // 4. method lookup failed ResourceMark rm(THREAD); THROW_MSG_CAUSE(vmSymbols::java_lang_NoSuchMethodError(), Method::name_and_sig_as_C_string(resolved_klass(), method_name, method_signature), nested_exception); } // 5. access checks, access checking may be turned off when calling from within the VM. if (check_access) { assert(current_klass.not_null() , "current_klass should not be null"); // check if method can be accessed by the referring class check_method_accessability(current_klass, resolved_klass, KlassHandle(THREAD, resolved_method->method_holder()), resolved_method, CHECK); // check loader constraints Handle loader (THREAD, InstanceKlass::cast(current_klass())->class_loader()); Handle class_loader (THREAD, resolved_method->method_holder()->class_loader()); { ResourceMark rm(THREAD); Symbol* failed_type_symbol = SystemDictionary::check_signature_loaders(method_signature, loader, class_loader, true, CHECK); if (failed_type_symbol != NULL) { const char* msg = "loader constraint violation: when resolving method" " \"%s\" the class loader (instance of %s) of the current class, %s," " and the class loader (instance of %s) for the method's defining class, %s, have" " different Class objects for the type %s used in the signature"; char* sig = Method::name_and_sig_as_C_string(resolved_klass(),method_name,method_signature); const char* loader1 = SystemDictionary::loader_name(loader()); char* current = InstanceKlass::cast(current_klass())->name()->as_C_string(); const char* loader2 = SystemDictionary::loader_name(class_loader()); char* target = InstanceKlass::cast(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) + strlen(current) + strlen(loader2) + strlen(target) + strlen(failed_type_name) + 1; char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, target, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } } } void LinkResolver::resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool nostatics, TRAPS) { // 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(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } // lookup method in this interface or its super, java.lang.Object // JDK8: also look for static methods lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, false, true, CHECK); if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // lookup method in all the super-interfaces lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK); } if (resolved_method.is_null()) { // no method found ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(), Method::name_and_sig_as_C_string(resolved_klass(), method_name, method_signature)); } if (check_access) { // JDK8 adds non-public interface methods, and accessability check requirement assert(current_klass.not_null() , "current_klass should not be null"); // check if method can be accessed by the referring class check_method_accessability(current_klass, resolved_klass, KlassHandle(THREAD, resolved_method->method_holder()), resolved_method, CHECK); HandleMark hm(THREAD); Handle loader (THREAD, InstanceKlass::cast(current_klass())->class_loader()); Handle class_loader (THREAD, resolved_method->method_holder()->class_loader()); { ResourceMark rm(THREAD); Symbol* failed_type_symbol = SystemDictionary::check_signature_loaders(method_signature, loader, class_loader, true, CHECK); if (failed_type_symbol != NULL) { const char* msg = "loader constraint violation: when resolving " "interface method \"%s\" the class loader (instance of %s) of the " "current class, %s, and the class loader (instance of %s) for " "the method's defining class, %s, have different Class objects for the type %s " "used in the signature"; char* sig = Method::name_and_sig_as_C_string(resolved_klass(),method_name,method_signature); const char* loader1 = SystemDictionary::loader_name(loader()); char* current = InstanceKlass::cast(current_klass())->name()->as_C_string(); const char* loader2 = SystemDictionary::loader_name(class_loader()); char* target = InstanceKlass::cast(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) + strlen(current) + strlen(loader2) + strlen(target) + strlen(failed_type_name) + 1; char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, target, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } } if (nostatics && 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(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } if (TraceItables && Verbose) { ResourceMark rm(THREAD); tty->print("invokeinterface resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", (current_klass.is_null() ? "" : current_klass->internal_name()), (resolved_klass.is_null() ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass(), resolved_method->name(), resolved_method->signature()), resolved_method->method_holder()->internal_name() ); resolved_method->access_flags().print_on(tty); if (resolved_method->is_default_method()) { tty->print("default "); } if (resolved_method->is_overpass()) { tty->print("overpass"); } tty->cr(); } } //------------------------------------------------------------------------------------------------------------------------ // Field resolution void LinkResolver::check_field_accessability(KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS) { if (!Reflection::verify_field_access(ref_klass(), resolved_klass(), sel_klass(), fd.access_flags(), true)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "tried to access field %s.%s from class %s", sel_klass->external_name(), fd.name()->as_C_string(), ref_klass->external_name() ); return; } } void LinkResolver::resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) { // Load these early in case the resolve of the containing klass fails Symbol* field = pool->name_ref_at(index); Symbol* sig = pool->signature_ref_at(index); // resolve specified klass KlassHandle resolved_klass; resolve_klass(resolved_klass, pool, index, CHECK); KlassHandle current_klass(THREAD, pool->pool_holder()); resolve_field(result, resolved_klass, field, sig, current_klass, byte, true, true, CHECK); } void LinkResolver::resolve_field(fieldDescriptor& fd, KlassHandle resolved_klass, Symbol* field, Symbol* sig, KlassHandle current_klass, Bytecodes::Code byte, bool check_access, bool initialize_class, TRAPS) { assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic || byte == Bytecodes::_getfield || byte == Bytecodes::_putfield || (byte == Bytecodes::_nop && !check_access), "bad field access bytecode"); bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic); bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic); // Check if there's a resolved klass containing the field if (resolved_klass.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); } // Resolve instance field KlassHandle sel_klass(THREAD, 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.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string()); } if (!check_access) // Access checking may be turned off when calling from within the VM. return; // check access 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); } // Final fields can only be accessed from its own class. if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) { THROW(vmSymbols::java_lang_IllegalAccessError()); } // 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()) { HandleMark hm(THREAD); Handle ref_loader (THREAD, InstanceKlass::cast(current_klass())->class_loader()); Handle sel_loader (THREAD, InstanceKlass::cast(sel_klass())->class_loader()); { ResourceMark rm(THREAD); 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\" the class loader (instance of %s) of the referring class, " "%s, and the class loader (instance of %s) for the field's resolved " "type, %s, have different Class objects for that type"; char* field_name = field->as_C_string(); const char* loader1 = SystemDictionary::loader_name(ref_loader()); char* sel = InstanceKlass::cast(sel_klass())->name()->as_C_string(); const char* loader2 = SystemDictionary::loader_name(sel_loader()); char* failed_type_name = failed_type_symbol->as_C_string(); size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1) + strlen(sel) + strlen(loader2) + strlen(failed_type_name) + 1; char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); jio_snprintf(buf, buflen, msg, field_name, loader1, sel, loader2, failed_type_name); THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); } } } // 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, KlassHandle& resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool initialize_class, TRAPS) { methodHandle resolved_method; linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); resolved_klass = KlassHandle(THREAD, 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); linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); } // setup result result.set_static(resolved_klass, resolved_method, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_static_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { if (!resolved_klass->is_interface()) { resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, false, CHECK); } else { resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, false, CHECK); } 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(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } } void LinkResolver::resolve_special_call(CallInfo& result, Handle recv, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { methodHandle resolved_method; linktime_resolve_special_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); runtime_resolve_special_method(result, resolved_method, resolved_klass, current_klass, recv, check_access, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_special_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, 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 if (!resolved_klass->is_interface()) { resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, false, CHECK); } else { resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, true, CHECK); } // 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; } // check if invokespecial's interface method reference is in an indirect superinterface if (!current_klass.is_null() && resolved_klass->is_interface()) { Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ? current_klass() : InstanceKlass::cast(current_klass())->host_klass(); // As of the fix for 4486457 we disable verification for all of the // dynamically-generated bytecodes associated with the 1.4 // reflection implementation, not just those associated with // sun/reflect/SerializationConstructorAccessor. bool is_reflect = JDK_Version::is_gte_jdk14x_version() && UseNewReflection && klass_to_check->is_subclass_of( SystemDictionary::reflect_MagicAccessorImpl_klass()); if (!is_reflect && !InstanceKlass::cast(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(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(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } if (TraceItables && Verbose) { ResourceMark rm(THREAD); tty->print("invokespecial resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", (current_klass.is_null() ? "" : current_klass->internal_name()), (resolved_klass.is_null() ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass(), resolved_method->name(), resolved_method->signature()), resolved_method->method_holder()->internal_name() ); resolved_method->access_flags().print_on(tty); if (resolved_method->is_default_method()) { tty->print("default "); } if (resolved_method->is_overpass()) { tty->print("overpass"); } tty->cr(); } } // throws runtime exceptions void LinkResolver::runtime_resolve_special_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, Handle recv, bool check_access, TRAPS) { // 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 (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 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 KlassHandle super_klass(THREAD, current_klass->super()); lookup_instance_method_in_klasses(sel_method, super_klass, resolved_method->name(), resolved_method->signature(), 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 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() ? InstanceKlass::cast(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 (TraceItables && Verbose) { ResourceMark rm(THREAD); tty->print("invokespecial selected method: resolved-class:%s, method:%s, method_holder:%s, access_flags: ", (resolved_klass.is_null() ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass(), sel_method->name(), sel_method->signature()), sel_method->method_holder()->internal_name() ); sel_method->access_flags().print_on(tty); if (sel_method->is_default_method()) { tty->print("default "); } if (sel_method->is_overpass()) { tty->print("overpass"); } tty->cr(); } // setup result result.set_static(resolved_klass, sel_method, CHECK); } void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS) { methodHandle resolved_method; linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_virtual_method(methodHandle &resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { // normal method resolution resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, true, CHECK); 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 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.is_null() ? "" : current_klass->internal_name())); THROW_MSG(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(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); } if (PrintVtables && Verbose) { ResourceMark rm(THREAD); tty->print("invokevirtual resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ", (current_klass.is_null() ? "" : current_klass->internal_name()), (resolved_klass.is_null() ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass(), resolved_method->name(), resolved_method->signature()), resolved_method->method_holder()->internal_name() ); resolved_method->access_flags().print_on(tty); if (resolved_method->is_default_method()) { tty->print("default "); } if (resolved_method->is_overpass()) { tty->print("overpass"); } tty->cr(); } } // throws runtime exceptions void LinkResolver::runtime_resolve_virtual_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS) { // setup default return values int vtable_index = Method::invalid_vtable_index; methodHandle selected_method; assert(recv.is_null() || recv->is_oop(), "receiver is not an oop"); // 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"); InstanceKlass* inst = InstanceKlass::cast(recv_klass()); selected_method = methodHandle(THREAD, inst->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 for final methods, // because as an optimization they are they are never put in the vtable, // unless they override an existing method. // If we do get a negative, it means the resolved method is the the selected // 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 { // recv_klass might be an arrayKlassOop but all vtables start at // the same place. The cast is to avoid virtual call and assertion. InstanceKlass* inst = (InstanceKlass*)recv_klass(); selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index)); } } // check if method exists if (selected_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 if abstract if (check_null_and_abstract && selected_method->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), Method::name_and_sig_as_C_string(resolved_klass(), selected_method->name(), selected_method->signature())); } if (PrintVtables && Verbose) { ResourceMark rm(THREAD); tty->print("invokevirtual selected method: receiver-class:%s, resolved-class:%s, method:%s, method_holder:%s, vtable_index:%d, access_flags: ", (recv_klass.is_null() ? "" : recv_klass->internal_name()), (resolved_klass.is_null() ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass(), resolved_method->name(), resolved_method->signature()), selected_method->method_holder()->internal_name(), vtable_index ); selected_method->access_flags().print_on(tty); if (selected_method->is_default_method()) { tty->print("default "); } if (selected_method->is_overpass()) { tty->print("overpass"); } tty->cr(); } // 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, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS) { methodHandle resolved_method; linktime_resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK); runtime_resolve_interface_method(result, resolved_method, resolved_klass, recv, recv_klass, check_null_and_abstract, CHECK); } // throws linktime exceptions void LinkResolver::linktime_resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) { // normal interface method resolution resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, true, CHECK); 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"); } // throws runtime exceptions void LinkResolver::runtime_resolve_interface_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle 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 private interface 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 invokeinterface: 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 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); } // do lookup based on receiver klass methodHandle sel_method; // This search must match the linktime preparation search for itable initialization // to correctly enforce loader constraints for interface method inheritance lookup_instance_method_in_klasses(sel_method, recv_klass, resolved_method->name(), resolved_method->signature(), CHECK); if (sel_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. sel_method = resolved_method; } // check if method exists if (sel_method.is_null()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), Method::name_and_sig_as_C_string(recv_klass(), resolved_method->name(), resolved_method->signature())); } // check access // Throw Illegal Access Error if sel_method is not public. if (!sel_method->is_public()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_IllegalAccessError(), Method::name_and_sig_as_C_string(recv_klass(), sel_method->name(), sel_method->signature())); } // check if abstract if (check_null_and_abstract && sel_method->is_abstract()) { ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_AbstractMethodError(), Method::name_and_sig_as_C_string(recv_klass(), sel_method->name(), sel_method->signature())); } if (TraceItables && Verbose) { ResourceMark rm(THREAD); tty->print("invokeinterface selected method: receiver-class:%s, resolved-class:%s, method:%s, method_holder:%s, access_flags: ", (recv_klass.is_null() ? "" : recv_klass->internal_name()), (resolved_klass.is_null() ? "" : resolved_klass->internal_name()), Method::name_and_sig_as_C_string(resolved_klass(), resolved_method->name(), resolved_method->signature()), sel_method->method_holder()->internal_name() ); sel_method->access_flags().print_on(tty); if (sel_method->is_default_method()) { tty->print("default "); } if (sel_method->is_overpass()) { tty->print("overpass"); } tty->cr(); } // setup result if (!resolved_method->has_itable_index()) { int vtable_index = resolved_method->vtable_index(); assert(vtable_index == sel_method->vtable_index(), "sanity check"); result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK); } else { int itable_index = resolved_method()->itable_index(); result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK); } } methodHandle LinkResolver::linktime_resolve_interface_method_or_null( KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; methodHandle method_result; linktime_resolve_interface_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } else { return method_result; } } methodHandle LinkResolver::linktime_resolve_virtual_method_or_null( KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; methodHandle method_result; linktime_resolve_virtual_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } else { return method_result; } } methodHandle LinkResolver::resolve_virtual_call_or_null( KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; CallInfo info; resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, check_access, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } methodHandle LinkResolver::resolve_interface_call_or_null( KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; CallInfo info; resolve_interface_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, check_access, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } int LinkResolver::resolve_virtual_vtable_index( KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass) { EXCEPTION_MARK; CallInfo info; resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, 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( KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; CallInfo info; resolve_static_call(info, resolved_klass, name, signature, current_klass, check_access, false, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } methodHandle LinkResolver::resolve_special_call_or_null( KlassHandle resolved_klass, Symbol* name, Symbol* signature, KlassHandle current_klass, bool check_access) { EXCEPTION_MARK; CallInfo info; resolve_special_call(info, Handle(), resolved_klass, name, signature, current_klass, check_access, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return methodHandle(); } return info.selected_method(); } //------------------------------------------------------------------------------------------------------------------------ // ConstantPool entries void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, 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; } return; } void LinkResolver::resolve_pool(KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS) { // resolve klass resolve_klass(resolved_klass, pool, index, CHECK); // Get name, signature, and static klass method_name = pool->name_ref_at(index); method_signature = pool->signature_ref_at(index); current_klass = KlassHandle(THREAD, pool->pool_holder()); } void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); resolve_static_call(result, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } void LinkResolver::resolve_invokespecial(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); resolve_special_call(result, recv, resolved_klass, method_name, method_signature, current_klass, true, CHECK); } void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass()); resolve_virtual_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) { KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass()); resolve_interface_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK); } void LinkResolver::resolve_invokehandle(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { assert(EnableInvokeDynamic, ""); // This guy is reached from InterpreterRuntime::resolve_invokehandle. KlassHandle resolved_klass; Symbol* method_name = NULL; Symbol* method_signature = NULL; KlassHandle current_klass; resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK); if (TraceMethodHandles) { ResourceMark rm(THREAD); tty->print_cr("resolve_invokehandle %s %s", method_name->as_C_string(), method_signature->as_C_string()); } resolve_handle_call(result, resolved_klass, method_name, method_signature, current_klass, CHECK); } void LinkResolver::resolve_handle_call(CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS) { // JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar assert(resolved_klass() == SystemDictionary::MethodHandle_klass(), ""); assert(MethodHandles::is_signature_polymorphic_name(method_name), ""); methodHandle resolved_method; Handle resolved_appendix; Handle resolved_method_type; lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, &resolved_appendix, &resolved_method_type, CHECK); result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK); } static void wrap_invokedynamic_exception(TRAPS) { if (HAS_PENDING_EXCEPTION) { if (TraceMethodHandles) { tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION)); PENDING_EXCEPTION->print(); } if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) { // throw these guys, since they are already wrapped return; } if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { // intercept only LinkageErrors which might have failed to wrap return; } // See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS. Handle nested_exception(THREAD, PENDING_EXCEPTION); CLEAR_PENDING_EXCEPTION; THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception) } } void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) { assert(EnableInvokeDynamic, ""); //resolve_pool(, method_name, method_signature, current_klass, pool, index, CHECK); Symbol* method_name = pool->name_ref_at(index); Symbol* method_signature = pool->signature_ref_at(index); KlassHandle current_klass = KlassHandle(THREAD, 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); if (cpce->is_f1_null()) { int pool_index = cpce->constant_pool_index(); oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, THREAD); wrap_invokedynamic_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); wrap_invokedynamic_exception(CHECK); return; } if (TraceMethodHandles) { ResourceMark rm(THREAD); tty->print_cr("resolve_invokedynamic #%d %s %s", ConstantPool::decode_invokedynamic_index(index), method_name->as_C_string(), method_signature->as_C_string()); tty->print(" BSM info: "); bootstrap_specifier->print(); } resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK); } void LinkResolver::resolve_dynamic_call(CallInfo& result, Handle bootstrap_specifier, Symbol* method_name, Symbol* method_signature, KlassHandle 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, bootstrap_specifier, method_name, method_signature, &resolved_appendix, &resolved_method_type, THREAD); wrap_invokedynamic_exception(CHECK); result.set_handle(resolved_method, resolved_appendix, resolved_method_type, THREAD); wrap_invokedynamic_exception(CHECK); } //------------------------------------------------------------------------------------------------------------------------ #ifndef PRODUCT void CallInfo::print() { ResourceMark rm; const char* kindstr = "unknown"; switch (_call_kind) { case direct_call: kindstr = "direct"; break; case vtable_call: kindstr = "vtable"; break; case itable_call: kindstr = "itable"; 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