/* * Copyright (c) 2008, 2013, 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/symbolTable.hpp" #include "compiler/compileBroker.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/oopMapCache.hpp" #include "memory/allocation.inline.hpp" #include "memory/oopFactory.hpp" #include "prims/jvmtiRedefineClassesTrace.hpp" #include "prims/methodHandles.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/javaCalls.hpp" #include "runtime/reflection.hpp" #include "runtime/signature.hpp" #include "runtime/stubRoutines.hpp" /* * JSR 292 reference implementation: method handles * The JDK 7 reference implementation represented method handle * combinations as chains. Each link in the chain had a "vmentry" * field which pointed at a bit of assembly code which performed * one transformation before dispatching to the next link in the chain. * * The current reference implementation pushes almost all code generation * responsibility to (trusted) Java code. A method handle contains a * pointer to its "LambdaForm", which embodies all details of the method * handle's behavior. The LambdaForm is a normal Java object, managed * by a runtime coded in Java. */ bool MethodHandles::_enabled = false; // set true after successful native linkage MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; //------------------------------------------------------------------------------ // MethodHandles::generate_adapters // void MethodHandles::generate_adapters() { if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return; assert(_adapter_code == NULL, "generate only once"); ResourceMark rm; TraceTime timer("MethodHandles adapters generation", TraceStartupTime); _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); if (_adapter_code == NULL) vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR, "CodeCache: no room for MethodHandles adapters"); { CodeBuffer code(_adapter_code); MethodHandlesAdapterGenerator g(&code); g.generate(); code.log_section_sizes("MethodHandlesAdapterBlob"); } } //------------------------------------------------------------------------------ // MethodHandlesAdapterGenerator::generate // void MethodHandlesAdapterGenerator::generate() { // Generate generic method handle adapters. // Generate interpreter entries for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; mk <= Interpreter::method_handle_invoke_LAST; mk = Interpreter::MethodKind(1 + (int)mk)) { vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); if (entry != NULL) { Interpreter::set_entry_for_kind(mk, entry); } // If the entry is not set, it will throw AbstractMethodError. } } void MethodHandles::set_enabled(bool z) { if (_enabled != z) { guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); _enabled = z; } } // MemberName support // import java_lang_invoke_MemberName.* enum { IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE }; Handle MethodHandles::new_MemberName(TRAPS) { Handle empty; instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); if (!k->is_initialized()) k->initialize(CHECK_(empty)); return Handle(THREAD, k->allocate_instance(THREAD)); } oop MethodHandles::init_MemberName(Handle mname, Handle target) { // This method is used from java.lang.invoke.MemberName constructors. // It fills in the new MemberName from a java.lang.reflect.Member. Thread* thread = Thread::current(); oop target_oop = target(); Klass* target_klass = target_oop->klass(); if (target_klass == SystemDictionary::reflect_Field_klass()) { oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); if (!k.is_null() && k->oop_is_instance()) { fieldDescriptor fd(InstanceKlass::cast(k()), slot); oop mname2 = init_field_MemberName(mname, fd); if (mname2 != NULL) { // Since we have the reified name and type handy, add them to the result. if (java_lang_invoke_MemberName::name(mname2) == NULL) java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); if (java_lang_invoke_MemberName::type(mname2) == NULL) java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); } return mname2; } } else if (target_klass == SystemDictionary::reflect_Method_klass()) { oop clazz = java_lang_reflect_Method::clazz(target_oop); int slot = java_lang_reflect_Method::slot(target_oop); KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); if (!k.is_null() && k->oop_is_instance()) { Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) return NULL; // do not resolve unless there is a concrete signature CallInfo info(m, k()); return init_method_MemberName(mname, info); } } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { oop clazz = java_lang_reflect_Constructor::clazz(target_oop); int slot = java_lang_reflect_Constructor::slot(target_oop); KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); if (!k.is_null() && k->oop_is_instance()) { Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); if (m == NULL) return NULL; CallInfo info(m, k()); return init_method_MemberName(mname, info); } } return NULL; } oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { assert(info.resolved_appendix().is_null(), "only normal methods here"); KlassHandle receiver_limit = info.resolved_klass(); methodHandle m = info.resolved_method(); int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); int vmindex = Method::invalid_vtable_index; switch (info.call_kind()) { case CallInfo::itable_call: vmindex = info.itable_index(); // More importantly, the itable index only works with the method holder. receiver_limit = m->method_holder(); assert(receiver_limit->verify_itable_index(vmindex), ""); flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); break; case CallInfo::vtable_call: vmindex = info.vtable_index(); flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); assert(receiver_limit->is_subtype_of(m->method_holder()), "virtual call must be type-safe"); break; case CallInfo::direct_call: vmindex = Method::nonvirtual_vtable_index; if (m->is_static()) { flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); } else if (m->is_initializer()) { flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); assert(receiver_limit == m->method_holder(), "constructor call must be exactly typed"); } else { flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); assert(receiver_limit->is_subtype_of(m->method_holder()), "special call must be type-safe"); } break; default: assert(false, "bad CallInfo"); return NULL; } // @CallerSensitive annotation detected if (m->caller_sensitive()) { flags |= CALLER_SENSITIVE; } oop mname_oop = mname(); java_lang_invoke_MemberName::set_flags( mname_oop, flags); java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror()); // Note: name and type can be lazily computed by resolve_MemberName, // if Java code needs them as resolved String and MethodType objects. // The clazz must be eagerly stored, because it provides a GC // root to help keep alive the Method*. // If relevant, the vtable or itable value is stored as vmindex. // This is done eagerly, since it is readily available without // constructing any new objects. // TO DO: maybe intern mname_oop m->method_holder()->add_member_name(m->method_idnum(), mname); return mname(); } oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); Metadata* vmtarget = fd.field_holder(); int vmindex = fd.offset(); // determines the field uniquely when combined with static bit oop mname_oop = mname(); java_lang_invoke_MemberName::set_flags(mname_oop, flags); java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); oop type = field_signature_type_or_null(fd.signature()); oop name = field_name_or_null(fd.name()); if (name != NULL) java_lang_invoke_MemberName::set_name(mname_oop, name); if (type != NULL) java_lang_invoke_MemberName::set_type(mname_oop, type); // Note: name and type can be lazily computed by resolve_MemberName, // if Java code needs them as resolved String and Class objects. // Note that the incoming type oop might be pre-resolved (non-null). // The base clazz and field offset (vmindex) must be eagerly stored, // because they unambiguously identify the field. // Although the fieldDescriptor::_index would also identify the field, // we do not use it, because it is harder to decode. // TO DO: maybe intern mname_oop return mname(); } // JVM 2.9 Special Methods: // A method is signature polymorphic if and only if all of the following conditions hold : // * It is declared in the java.lang.invoke.MethodHandle class. // * It has a single formal parameter of type Object[]. // * It has a return type of Object. // * It has the ACC_VARARGS and ACC_NATIVE flags set. bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { if (klass == NULL) return false; // The following test will fail spuriously during bootstrap of MethodHandle itself: // if (klass != SystemDictionary::MethodHandle_klass()) // Test the name instead: if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) return false; Symbol* poly_sig = vmSymbols::object_array_object_signature(); Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); if (m == NULL) return false; int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; int flags = m->access_flags().as_int(); return (flags & required) == required; } Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); switch (iid) { case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); } assert(false, ""); return 0; } int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { switch (iid) { case vmIntrinsics::_invokeBasic: return 0; case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; } assert(false, err_msg("iid=%d", iid)); return 0; } vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { vmSymbols::SID name_id = vmSymbols::find_sid(name); switch (name_id) { // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; // There is one static signature-polymorphic method for each JVM invocation mode. case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; } // Cover the case of invokeExact and any future variants of invokeFoo. Klass* mh_klass = SystemDictionary::well_known_klass( SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) return vmIntrinsics::_invokeGeneric; // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. return vmIntrinsics::_none; } vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { if (klass != NULL && klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { vmIntrinsics::ID iid = signature_polymorphic_name_id(name); if (iid != vmIntrinsics::_none) return iid; if (is_method_handle_invoke_name(klass, name)) return vmIntrinsics::_invokeGeneric; } return vmIntrinsics::_none; } // convert the external string or reflective type to an internal signature Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { if (java_lang_invoke_MethodType::is_instance(type_str)) { return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL); } else if (java_lang_Class::is_instance(type_str)) { return java_lang_Class::as_signature(type_str, false, CHECK_NULL); } else if (java_lang_String::is_instance(type_str)) { if (intern_if_not_found) { return java_lang_String::as_symbol(type_str, CHECK_NULL); } else { return java_lang_String::as_symbol_or_null(type_str); } } else { THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); } } static const char OBJ_SIG[] = "Ljava/lang/Object;"; enum { OBJ_SIG_LEN = 18 }; bool MethodHandles::is_basic_type_signature(Symbol* sig) { assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); const int len = sig->utf8_length(); for (int i = 0; i < len; i++) { switch (sig->byte_at(i)) { case 'L': // only java/lang/Object is valid here if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) return false; i += OBJ_SIG_LEN-1; //-1 because of i++ in loop continue; case '(': case ')': case 'V': case 'I': case 'J': case 'F': case 'D': continue; //case '[': //case 'Z': case 'B': case 'C': case 'S': default: return false; } } return true; } Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { Symbol* bsig = NULL; if (sig == NULL) { return sig; } else if (is_basic_type_signature(sig)) { sig->increment_refcount(); return sig; // that was easy } else if (sig->byte_at(0) != '(') { BasicType bt = char2type(sig->byte_at(0)); if (is_subword_type(bt)) { bsig = vmSymbols::int_signature(); } else { assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); bsig = vmSymbols::object_signature(); } } else { ResourceMark rm; stringStream buffer(128); buffer.put('('); int arg_pos = 0, keep_arg_pos = -1; if (keep_last_arg) keep_arg_pos = ArgumentCount(sig).size() - 1; for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { BasicType bt = ss.type(); size_t this_arg_pos = buffer.size(); if (ss.at_return_type()) { buffer.put(')'); } if (arg_pos == keep_arg_pos) { buffer.write((char*) ss.raw_bytes(), (int) ss.raw_length()); } else if (bt == T_OBJECT || bt == T_ARRAY) { buffer.write(OBJ_SIG, OBJ_SIG_LEN); } else { if (is_subword_type(bt)) bt = T_INT; buffer.put(type2char(bt)); } arg_pos++; } const char* sigstr = buffer.base(); int siglen = (int) buffer.size(); bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); } assert(is_basic_type_signature(bsig) || // detune assert in case the injected argument is not a basic type: keep_last_arg, ""); return bsig; } void MethodHandles::print_as_basic_type_signature_on(outputStream* st, Symbol* sig, bool keep_arrays, bool keep_basic_names) { st = st ? st : tty; int len = sig->utf8_length(); int array = 0; bool prev_type = false; for (int i = 0; i < len; i++) { char ch = sig->byte_at(i); switch (ch) { case '(': case ')': prev_type = false; st->put(ch); continue; case '[': if (!keep_basic_names && keep_arrays) st->put(ch); array++; continue; case 'L': { if (prev_type) st->put(','); int start = i+1, slash = start; while (++i < len && (ch = sig->byte_at(i)) != ';') { if (ch == '/' || ch == '.' || ch == '$') slash = i+1; } if (slash < i) start = slash; if (!keep_basic_names) { st->put('L'); } else { for (int j = start; j < i; j++) st->put(sig->byte_at(j)); prev_type = true; } break; } default: { if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { ch = '['; array = 0; } if (prev_type) st->put(','); const char* n = NULL; if (keep_basic_names) n = type2name(char2type(ch)); if (n == NULL) { // unknown letter, or we don't want to know its name st->put(ch); } else { st->print(n); prev_type = true; } break; } } // Switch break goes here to take care of array suffix: if (prev_type) { while (array > 0) { st->print("[]"); --array; } } array = 0; } } static oop object_java_mirror() { return SystemDictionary::Object_klass()->java_mirror(); } oop MethodHandles::field_name_or_null(Symbol* s) { if (s == NULL) return NULL; return StringTable::lookup(s); } oop MethodHandles::field_signature_type_or_null(Symbol* s) { if (s == NULL) return NULL; BasicType bt = FieldType::basic_type(s); if (is_java_primitive(bt)) { assert(s->utf8_length() == 1, ""); return java_lang_Class::primitive_mirror(bt); } // Here are some more short cuts for common types. // They are optional, since reference types can be resolved lazily. if (bt == T_OBJECT) { if (s == vmSymbols::object_signature()) { return object_java_mirror(); } else if (s == vmSymbols::class_signature()) { return SystemDictionary::Class_klass()->java_mirror(); } else if (s == vmSymbols::string_signature()) { return SystemDictionary::String_klass()->java_mirror(); } } return NULL; } // An unresolved member name is a mere symbolic reference. // Resolving it plants a vmtarget/vmindex in it, // which refers directly to JVM internals. Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) { Handle empty; assert(java_lang_invoke_MemberName::is_instance(mname()), ""); if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { // Already resolved. DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); assert(vmindex >= Method::nonvirtual_vtable_index, ""); return mname; } Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); int flags = java_lang_invoke_MemberName::flags(mname()); int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; if (!ref_kind_is_valid(ref_kind)) { THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); } DEBUG_ONLY(int old_vmindex); assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); } instanceKlassHandle defc; { Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); if (defc_klass == NULL) return empty; // a primitive; no resolution possible if (!defc_klass->oop_is_instance()) { if (!defc_klass->oop_is_array()) return empty; defc_klass = SystemDictionary::Object_klass(); } defc = instanceKlassHandle(THREAD, defc_klass); } if (defc.is_null()) { THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); } defc->link_class(CHECK_(empty)); // possible safepoint // convert the external string name to an internal symbol TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); if (name == NULL) return empty; // no such name if (name == vmSymbols::class_initializer_name()) return empty; // illegal name vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; if ((flags & ALL_KINDS) == IS_METHOD && (defc() == SystemDictionary::MethodHandle_klass()) && (ref_kind == JVM_REF_invokeVirtual || ref_kind == JVM_REF_invokeSpecial || // static invocation mode is required for _linkToVirtual, etc.: ref_kind == JVM_REF_invokeStatic)) { vmIntrinsics::ID iid = signature_polymorphic_name_id(name); if (iid != vmIntrinsics::_none && ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. // For a static reference it could an internal linkage routine like _linkToVirtual, etc. mh_invoke_id = iid; } } // convert the external string or reflective type to an internal signature TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); if (type == NULL) return empty; // no such signature exists in the VM // Time to do the lookup. switch (flags & ALL_KINDS) { case IS_METHOD: { CallInfo result; { assert(!HAS_PENDING_EXCEPTION, ""); if (ref_kind == JVM_REF_invokeStatic) { LinkResolver::resolve_static_call(result, defc, name, type, KlassHandle(), false, false, THREAD); } else if (ref_kind == JVM_REF_invokeInterface) { LinkResolver::resolve_interface_call(result, Handle(), defc, defc, name, type, KlassHandle(), false, false, THREAD); } else if (mh_invoke_id != vmIntrinsics::_none) { assert(!is_signature_polymorphic_static(mh_invoke_id), ""); LinkResolver::resolve_handle_call(result, defc, name, type, KlassHandle(), THREAD); } else if (ref_kind == JVM_REF_invokeSpecial) { LinkResolver::resolve_special_call(result, defc, name, type, KlassHandle(), false, THREAD); } else if (ref_kind == JVM_REF_invokeVirtual) { LinkResolver::resolve_virtual_call(result, Handle(), defc, defc, name, type, KlassHandle(), false, false, THREAD); } else { assert(false, err_msg("ref_kind=%d", ref_kind)); } if (HAS_PENDING_EXCEPTION) { return empty; } } if (result.resolved_appendix().not_null()) { // The resolved MemberName must not be accompanied by an appendix argument, // since there is no way to bind this value into the MemberName. // Caller is responsible to prevent this from happening. THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); } oop mname2 = init_method_MemberName(mname, result); return Handle(THREAD, mname2); } case IS_CONSTRUCTOR: { CallInfo result; { assert(!HAS_PENDING_EXCEPTION, ""); if (name == vmSymbols::object_initializer_name()) { LinkResolver::resolve_special_call(result, defc, name, type, KlassHandle(), false, THREAD); } else { break; // will throw after end of switch } if (HAS_PENDING_EXCEPTION) { return empty; } } assert(result.is_statically_bound(), ""); oop mname2 = init_method_MemberName(mname, result); return Handle(THREAD, mname2); } case IS_FIELD: { fieldDescriptor result; // find_field initializes fd if found { assert(!HAS_PENDING_EXCEPTION, ""); LinkResolver::resolve_field(result, defc, name, type, KlassHandle(), Bytecodes::_nop, false, false, THREAD); if (HAS_PENDING_EXCEPTION) { return empty; } } oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); return Handle(THREAD, mname2); } default: THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); } return empty; } // Conversely, a member name which is only initialized from JVM internals // may have null defc, name, and type fields. // Resolving it plants a vmtarget/vmindex in it, // which refers directly to JVM internals. void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { assert(java_lang_invoke_MemberName::is_instance(mname()), ""); Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); int vmindex = java_lang_invoke_MemberName::vmindex(mname()); if (vmtarget == NULL) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); } bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); int flags = java_lang_invoke_MemberName::flags(mname()); if (suppress != 0) { if (suppress & _suppress_defc) have_defc = true; if (suppress & _suppress_name) have_name = true; if (suppress & _suppress_type) have_type = true; } if (have_defc && have_name && have_type) return; // nothing needed switch (flags & ALL_KINDS) { case IS_METHOD: case IS_CONSTRUCTOR: { assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); methodHandle m(THREAD, (Method*)vmtarget); DEBUG_ONLY(vmtarget = NULL); // safety if (m.is_null()) break; if (!have_defc) { InstanceKlass* defc = m->method_holder(); java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); } if (!have_name) { //not java_lang_String::create_from_symbol; let's intern member names Handle name = StringTable::intern(m->name(), CHECK); java_lang_invoke_MemberName::set_name(mname(), name()); } if (!have_type) { Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); java_lang_invoke_MemberName::set_type(mname(), type()); } return; } case IS_FIELD: { assert(vmtarget->is_klass(), "field vmtarget is Klass*"); if (!((Klass*) vmtarget)->oop_is_instance()) break; instanceKlassHandle defc(THREAD, (Klass*) vmtarget); DEBUG_ONLY(vmtarget = NULL); // safety bool is_static = ((flags & JVM_ACC_STATIC) != 0); fieldDescriptor fd; // find_field initializes fd if found if (!defc->find_field_from_offset(vmindex, is_static, &fd)) break; // cannot expand if (!have_defc) { java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); } if (!have_name) { //not java_lang_String::create_from_symbol; let's intern member names Handle name = StringTable::intern(fd.name(), CHECK); java_lang_invoke_MemberName::set_name(mname(), name()); } if (!have_type) { // If it is a primitive field type, don't mess with short strings like "I". Handle type = field_signature_type_or_null(fd.signature()); if (type.is_null()) { java_lang_String::create_from_symbol(fd.signature(), CHECK); } java_lang_invoke_MemberName::set_type(mname(), type()); } return; } } THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); } int MethodHandles::find_MemberNames(KlassHandle k, Symbol* name, Symbol* sig, int mflags, KlassHandle caller, int skip, objArrayHandle results) { // %%% take caller into account! Thread* thread = Thread::current(); if (k.is_null() || !k->oop_is_instance()) return -1; int rfill = 0, rlimit = results->length(), rskip = skip; // overflow measurement: int overflow = 0, overflow_limit = MAX2(1000, rlimit); int match_flags = mflags; bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); bool local_only = !(search_superc | search_intfc); bool classes_only = false; if (name != NULL) { if (name->utf8_length() == 0) return 0; // a match is not possible } if (sig != NULL) { if (sig->utf8_length() == 0) return 0; // a match is not possible if (sig->byte_at(0) == '(') match_flags &= ~(IS_FIELD | IS_TYPE); else match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); } if ((match_flags & IS_TYPE) != 0) { // NYI, and Core Reflection works quite well for this query } if ((match_flags & IS_FIELD) != 0) { for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { if (name != NULL && st.name() != name) continue; if (sig != NULL && st.signature() != sig) continue; // passed the filters if (rskip > 0) { --rskip; } else if (rfill < rlimit) { Handle result(thread, results->obj_at(rfill++)); if (!java_lang_invoke_MemberName::is_instance(result())) return -99; // caller bug! oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); if (saved != result()) results->obj_at_put(rfill-1, saved); // show saved instance to user } else if (++overflow >= overflow_limit) { match_flags = 0; break; // got tired of looking at overflow } } } if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { // watch out for these guys: Symbol* init_name = vmSymbols::object_initializer_name(); Symbol* clinit_name = vmSymbols::class_initializer_name(); if (name == clinit_name) clinit_name = NULL; // hack for exposing bool negate_name_test = false; // fix name so that it captures the intention of IS_CONSTRUCTOR if (!(match_flags & IS_METHOD)) { // constructors only if (name == NULL) { name = init_name; } else if (name != init_name) { return 0; // no constructors of this method name } } else if (!(match_flags & IS_CONSTRUCTOR)) { // methods only if (name == NULL) { name = init_name; negate_name_test = true; // if we see the name, we *omit* the entry } else if (name == init_name) { return 0; // no methods of this constructor name } } else { // caller will accept either sort; no need to adjust name } for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { Method* m = st.method(); Symbol* m_name = m->name(); if (m_name == clinit_name) continue; if (name != NULL && ((m_name != name) ^ negate_name_test)) continue; if (sig != NULL && m->signature() != sig) continue; // passed the filters if (rskip > 0) { --rskip; } else if (rfill < rlimit) { Handle result(thread, results->obj_at(rfill++)); if (!java_lang_invoke_MemberName::is_instance(result())) return -99; // caller bug! CallInfo info(m); oop saved = MethodHandles::init_method_MemberName(result, info); if (saved != result()) results->obj_at_put(rfill-1, saved); // show saved instance to user } else if (++overflow >= overflow_limit) { match_flags = 0; break; // got tired of looking at overflow } } } // return number of elements we at leasted wanted to initialize return rfill + overflow; } //------------------------------------------------------------------------------ // MemberNameTable // MemberNameTable::MemberNameTable(int methods_cnt) : GrowableArray(methods_cnt, true) { assert_locked_or_safepoint(MemberNameTable_lock); } MemberNameTable::~MemberNameTable() { assert_locked_or_safepoint(MemberNameTable_lock); int len = this->length(); for (int idx = 0; idx < len; idx++) { jweak ref = this->at(idx); JNIHandles::destroy_weak_global(ref); } } void MemberNameTable::add_member_name(int index, jweak mem_name_wref) { assert_locked_or_safepoint(MemberNameTable_lock); this->at_put_grow(index, mem_name_wref); } // Return a member name oop or NULL. oop MemberNameTable::get_member_name(int index) { assert_locked_or_safepoint(MemberNameTable_lock); jweak ref = this->at(index); oop mem_name = JNIHandles::resolve(ref); return mem_name; } #if INCLUDE_JVMTI oop MemberNameTable::find_member_name_by_method(Method* old_method) { assert_locked_or_safepoint(MemberNameTable_lock); oop found = NULL; int len = this->length(); for (int idx = 0; idx < len; idx++) { oop mem_name = JNIHandles::resolve(this->at(idx)); if (mem_name == NULL) { continue; } Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); if (method == old_method) { found = mem_name; break; } } return found; } // It is called at safepoint only void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods, int methods_length, bool *trace_name_printed) { assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); // search the MemberNameTable for uses of either obsolete or EMCP methods for (int j = 0; j < methods_length; j++) { Method* old_method = old_methods[j]; Method* new_method = new_methods[j]; oop mem_name = find_member_name_by_method(old_method); if (mem_name != NULL) { java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method); if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { if (!(*trace_name_printed)) { // RC_TRACE_MESG macro has an embedded ResourceMark RC_TRACE_MESG(("adjust: name=%s", old_method->method_holder()->external_name())); *trace_name_printed = true; } // RC_TRACE macro has an embedded ResourceMark RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", new_method->name()->as_C_string(), new_method->signature()->as_C_string())); } } } } #endif // INCLUDE_JVMTI // // Here are the native methods in java.lang.invoke.MethodHandleNatives // They are the private interface between this JVM and the HotSpot-specific // Java code that implements JSR 292 method handles. // // Note: We use a JVM_ENTRY macro to define each of these, for this is the way // that intrinsic (non-JNI) native methods are defined in HotSpot. // JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { switch (which) { case MethodHandles::GC_COUNT_GWT: #ifdef COMPILER2 return true; #else return false; #endif } return 0; } JVM_END #ifndef PRODUCT #define EACH_NAMED_CON(template, requirement) \ template(MethodHandles,GC_COUNT_GWT) \ template(java_lang_invoke_MemberName,MN_IS_METHOD) \ template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ template(java_lang_invoke_MemberName,MN_IS_FIELD) \ template(java_lang_invoke_MemberName,MN_IS_TYPE) \ template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ template(MethodHandles,GC_LAMBDA_SUPPORT) \ /*end*/ #define IGNORE_REQ(req_expr) /* req_expr */ #define ONE_PLUS(scope,value) 1+ static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; #define VALUE_COMMA(scope,value) scope::value, static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; #define STRING_NULL(scope,value) #value "\0" static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; static bool advertise_con_value(int which) { if (which < 0) return false; bool ok = true; int count = 0; #define INC_COUNT(scope,value) \ ++count; #define CHECK_REQ(req_expr) \ if (which < count) return ok; \ ok = (req_expr); EACH_NAMED_CON(INC_COUNT, CHECK_REQ); #undef INC_COUNT #undef CHECK_REQ assert(count == con_value_count, ""); if (which < count) return ok; return false; } #undef ONE_PLUS #undef VALUE_COMMA #undef STRING_NULL #undef EACH_NAMED_CON #endif // PRODUCT JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { #ifndef PRODUCT if (advertise_con_value(which)) { assert(which >= 0 && which < con_value_count, ""); int con = con_values[which]; objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { const char* str = &con_names[0]; for (int i = 0; i < which; i++) str += strlen(str) + 1; // skip name and null oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint box->obj_at_put(0, name); } return con; } #endif return 0; } JVM_END // void init(MemberName self, AccessibleObject ref) JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); MethodHandles::init_MemberName(mname, target); } JVM_END // void expand(MemberName self) JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); MethodHandles::expand_MemberName(mname, 0, CHECK); } JVM_END // void resolve(MemberName self, Class caller) JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); // The trusted Java code that calls this method should already have performed // access checks on behalf of the given caller. But, we can verify this. if (VerifyMethodHandles && caller_jh != NULL && java_lang_invoke_MemberName::clazz(mname()) != NULL) { Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); if (reference_klass != NULL && reference_klass->oop_is_objArray()) { reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); } // Reflection::verify_class_access can only handle instance classes. if (reference_klass != NULL && reference_klass->oop_is_instance()) { // Emulate LinkResolver::check_klass_accessability. Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); if (!Reflection::verify_class_access(caller, reference_klass, true)) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); } } } Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL); if (resolved.is_null()) { int flags = java_lang_invoke_MemberName::flags(mname()); int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; if (!MethodHandles::ref_kind_is_valid(ref_kind)) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); } if ((flags & ALL_KINDS) == IS_FIELD) { THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); } else if ((flags & ALL_KINDS) == IS_METHOD || (flags & ALL_KINDS) == IS_CONSTRUCTOR) { THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); } else { THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); } } return JNIHandles::make_local(THREAD, resolved()); } JVM_END static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { if (mname == NULL || java_lang_invoke_MemberName::vmtarget(mname) == NULL) { THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); } else { int flags = java_lang_invoke_MemberName::flags(mname); if ((flags & IS_FIELD) != 0 && (must_be_static ? (flags & JVM_ACC_STATIC) != 0 : (flags & JVM_ACC_STATIC) == 0)) { int vmindex = java_lang_invoke_MemberName::vmindex(mname); return (jlong) vmindex; } } const char* msg = (must_be_static ? "static field required" : "non-static field required"); THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); return 0; } JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); } JVM_END JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); } JVM_END JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { // use the other function to perform sanity checks: jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); return JNIHandles::make_local(THREAD, clazz); } JVM_END JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { if (mname_jh == NULL) return NULL; Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); jvalue vmindex_value; vmindex_value.j = (long)vmindex; oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); result->obj_at_put(0, x); x = NULL; if (vmtarget == NULL) { x = NULL; } else if (vmtarget->is_klass()) { x = ((Klass*) vmtarget)->java_mirror(); } else if (vmtarget->is_method()) { Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL); CallInfo info((Method*)vmtarget); x = MethodHandles::init_method_MemberName(mname2, info); } result->obj_at_put(1, x); return JNIHandles::make_local(env, result()); } JVM_END // static native int getMembers(Class defc, String matchName, String matchSig, // int matchFlags, Class caller, int skip, MemberName[] results); JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, jclass clazz_jh, jstring name_jh, jstring sig_jh, int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { if (clazz_jh == NULL || results_jh == NULL) return -1; KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); if (results.is_null() || !results->is_objArray()) return -1; TempNewSymbol name = NULL; TempNewSymbol sig = NULL; if (name_jh != NULL) { name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); if (name == NULL) return 0; // a match is not possible } if (sig_jh != NULL) { sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); if (sig == NULL) return 0; // a match is not possible } KlassHandle caller; if (caller_jh != NULL) { oop caller_oop = JNIHandles::resolve_non_null(caller_jh); if (!java_lang_Class::is_instance(caller_oop)) return -1; caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); } if (name != NULL && sig != NULL && results.not_null()) { // try a direct resolve // %%% TO DO } int res = MethodHandles::find_MemberNames(k, name, sig, mflags, caller, skip, results); // TO DO: expand at least some of the MemberNames, to avoid massive callbacks return res; } JVM_END JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); Handle target (THREAD, JNIHandles::resolve(target_jh)); { // Walk all nmethods depending on this call site. MutexLocker mu(Compile_lock, thread); Universe::flush_dependents_on(call_site, target); java_lang_invoke_CallSite::set_target(call_site(), target()); } } JVM_END JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); Handle target (THREAD, JNIHandles::resolve(target_jh)); { // Walk all nmethods depending on this call site. MutexLocker mu(Compile_lock, thread); Universe::flush_dependents_on(call_site, target); java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); } } JVM_END /** * Throws a java/lang/UnsupportedOperationException unconditionally. * This is required by the specification of MethodHandle.invoke if * invoked directly. */ JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); return NULL; } JVM_END /** * Throws a java/lang/UnsupportedOperationException unconditionally. * This is required by the specification of MethodHandle.invokeExact if * invoked directly. */ JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); return NULL; } JVM_END /// JVM_RegisterMethodHandleMethods #undef CS // Solaris builds complain #define LANG "Ljava/lang/" #define JLINV "Ljava/lang/invoke/" #define OBJ LANG"Object;" #define CLS LANG"Class;" #define STRG LANG"String;" #define CS JLINV"CallSite;" #define MT JLINV"MethodType;" #define MH JLINV"MethodHandle;" #define MEM JLINV"MemberName;" #define CC (char*) /*cast a literal from (const char*)*/ #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) // These are the native methods on java.lang.invoke.MethodHandleNatives. static JNINativeMethod MHN_methods[] = { {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, // static native int getNamedCon(int which, Object[] name) {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, // static native int getMembers(Class defc, String matchName, String matchSig, // int matchFlags, Class caller, int skip, MemberName[] results); {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} }; static JNINativeMethod MH_methods[] = { // UnsupportedOperationException throwers {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} }; /** * Helper method to register native methods. */ static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { int status = env->RegisterNatives(clazz, methods, nMethods); if (status != JNI_OK || env->ExceptionOccurred()) { warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); env->ExceptionClear(); return false; } return true; } /** * This one function is exported, used by NativeLookup. */ JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { if (!EnableInvokeDynamic) { warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable."); return; // bind nothing } assert(!MethodHandles::enabled(), "must not be enabled"); bool enable_MH = true; jclass MH_class = NULL; if (SystemDictionary::MethodHandle_klass() == NULL) { enable_MH = false; } else { oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); MH_class = (jclass) JNIHandles::make_local(env, mirror); } if (enable_MH) { ThreadToNativeFromVM ttnfv(thread); if (enable_MH) { enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); } if (enable_MH) { enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); } } if (TraceInvokeDynamic) { tty->print_cr("MethodHandle support loaded (using LambdaForms)"); } if (enable_MH) { MethodHandles::generate_adapters(); MethodHandles::set_enabled(true); } } JVM_END