diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/interpreter/linkResolver.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/interpreter/linkResolver.cpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,1747 @@ +/* + * 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/javaClasses.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.inline.hpp" +#include "oops/instanceKlass.hpp" +#include "oops/method.hpp" +#include "oops/objArrayOop.hpp" +#include "oops/oop.inline.hpp" +#include "prims/jvm.h" +#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(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, TRAPS) { + Reflection::VerifyClassAccessResults vca_result = + Reflection::verify_class_access(ref_klass, InstanceKlass::cast(sel_klass), true); + if (vca_result != Reflection::ACCESS_OK) { + ResourceMark rm(THREAD); + char* msg = Reflection::verify_class_access_msg(ref_klass, + InstanceKlass::cast(sel_klass), + vca_result); + if (msg == NULL) { + Exceptions::fthrow( + THREAD_AND_LOCATION, + vmSymbols::java_lang_IllegalAccessError(), + "failed to access class %s from class %s", + sel_klass->external_name(), + ref_klass->external_name()); + } 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, TRAPS) { + Method* result = klass->uncached_lookup_method(name, signature, Klass::find_overpass); + + 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); + } + + 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"); + + 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; + } +} + +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 (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 = link_info.method_string(); + const char* loader1_name = SystemDictionary::loader_name(current_loader()); + char* current = link_info.current_klass()->name()->as_C_string(); + const char* loader2_name = SystemDictionary::loader_name(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\" 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_name = SystemDictionary::loader_name(ref_loader()); + char* sel = sel_klass->name()->as_C_string(); + const char* loader2_name = 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_name) + + strlen(sel) + strlen(loader2_name) + strlen(failed_type_name) + 1; + char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); + jio_snprintf(buf, buflen, msg, field_name, loader1_name, sel, loader2_name, + 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); + } + + // 5. 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); + } + + 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 (code == Bytecodes::_invokeinterface && resolved_method->is_private()) { + ResourceMark rm(THREAD); + char buf[200]; + + Klass* current_klass = link_info.current_klass(); + jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: 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); + } + + 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) { + 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& 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, resolved_method, + link_info.resolved_klass(), + link_info.current_klass(), + recv, + link_info.check_access(), 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; + } + + // check if invokespecial's interface method reference is in 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 methodHandle& resolved_method, + Klass* resolved_klass, + Klass* 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 + Klass* super_klass = current_klass->super(); + sel_method = lookup_instance_method_in_klasses(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() ? 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 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 { + selected_method = methodHandle(THREAD, recv_klass->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 (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); + } + + // 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 + methodHandle sel_method = lookup_instance_method_in_klasses(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 (log_develop_is_enabled(Trace, itables)) { + trace_method_resolution("invokeinterface selected method: receiver-class:", + recv_klass, resolved_klass, sel_method, true); + } + // 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( + 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); +} + +static void wrap_invokedynamic_exception(TRAPS) { + if (HAS_PENDING_EXCEPTION) { + // See the "Linking Exceptions" section for the invokedynamic instruction + // in JVMS 6.5. + if (PENDING_EXCEPTION->is_a(SystemDictionary::Error_klass())) { + // Pass through an Error, including BootstrapMethodError, any other form + // of linkage error, or say ThreadDeath/OutOfMemoryError + if (TraceMethodHandles) { + tty->print_cr("invokedynamic passes through an Error for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION)); + PENDING_EXCEPTION->print(); + } + return; + } + + // Otherwise wrap the exception in a BootstrapMethodError + if (TraceMethodHandles) { + tty->print_cr("invokedynamic throws BSME for " INTPTR_FORMAT, p2i((void *)PENDING_EXCEPTION)); + PENDING_EXCEPTION->print(); + } + Handle nested_exception(THREAD, PENDING_EXCEPTION); + CLEAR_PENDING_EXCEPTION; + THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception) + } +} + +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); + 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 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, 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, + 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, + 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); +}