/* * Copyright (c) 2008, 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/javaClasses.inline.hpp" #include "classfile/stringTable.hpp" #include "code/codeCache.hpp" #include "code/dependencyContext.hpp" #include "compiler/compileBroker.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/oopMapCache.hpp" #include "interpreter/linkResolver.hpp" #include "memory/allocation.inline.hpp" #include "memory/oopFactory.hpp" #include "memory/resourceArea.hpp" #include "oops/objArrayOop.inline.hpp" #include "oops/oop.inline.hpp" #include "prims/methodHandles.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/javaCalls.hpp" #include "runtime/timerTrace.hpp" #include "runtime/reflection.hpp" #include "runtime/signature.hpp" #include "runtime/stubRoutines.hpp" #include "utilities/exceptions.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; /** * Generates method handle adapters. Returns 'false' if memory allocation * failed and true otherwise. */ void MethodHandles::generate_adapters() { assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); assert(_adapter_code == NULL, "generate only once"); ResourceMark rm; TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 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, "can only enable once"); _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 }; int MethodHandles::ref_kind_to_flags(int ref_kind) { assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); int flags = (ref_kind << REFERENCE_KIND_SHIFT); if (ref_kind_is_field(ref_kind)) { flags |= IS_FIELD; } else if (ref_kind_is_method(ref_kind)) { flags |= IS_METHOD; } else if (ref_kind == JVM_REF_newInvokeSpecial) { flags |= IS_CONSTRUCTOR; } return flags; } Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { Handle empty; Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); if (!java_lang_String::is_instance_inlined(type())) { return type; // already resolved } Symbol* signature = java_lang_String::as_symbol_or_null(type()); if (signature == NULL) { return empty; // no such signature exists in the VM } Handle resolved; int flags = java_lang_invoke_MemberName::flags(mname()); switch (flags & ALL_KINDS) { case IS_METHOD: case IS_CONSTRUCTOR: resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); break; case IS_FIELD: resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); break; default: THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); } if (resolved.is_null()) { THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); } return resolved; } oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { // 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() Klass* k = java_lang_Class::as_Klass(clazz); if (k != NULL && k->is_instance_klass()) { 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); Klass* k = java_lang_Class::as_Klass(clazz); if (k != NULL && k->is_instance_klass()) { 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, CHECK_NULL); 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); Klass* k = java_lang_Class::as_Klass(clazz); if (k != NULL && k->is_instance_klass()) { Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); if (m == NULL) return NULL; CallInfo info(m, k, CHECK_NULL); 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"); methodHandle m = info.resolved_method(); assert(m.not_null(), "null method handle"); Klass* m_klass = m->method_holder(); assert(m_klass != NULL, "null holder for method handle"); 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. assert(m_klass->verify_itable_index(vmindex), ""); flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); if (TraceInvokeDynamic) { ttyLocker ttyl; ResourceMark rm; tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), vmindex); m->access_flags().print_on(tty); if (!m->is_abstract()) { tty->print("default"); } tty->cr(); } break; case CallInfo::vtable_call: vmindex = info.vtable_index(); flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); if (m_klass->is_interface()) { // This is a vtable call to an interface method (abstract "miranda method" or default method). // The vtable index is meaningless without a class (not interface) receiver type, so get one. // (LinkResolver should help us figure this out.) Klass* m_klass_non_interface = info.resolved_klass(); if (m_klass_non_interface->is_interface()) { m_klass_non_interface = SystemDictionary::Object_klass(); #ifdef ASSERT { ResourceMark rm; Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); assert(m->name() == m2->name() && m->signature() == m2->signature(), "at %d, %s != %s", vmindex, m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); } #endif //ASSERT } if (!m->is_public()) { assert(m->is_public(), "virtual call must be to public interface method"); return NULL; // elicit an error later in product build } assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); m_klass = m_klass_non_interface; } if (TraceInvokeDynamic) { ttyLocker ttyl; ResourceMark rm; tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), m_klass->internal_name(), vmindex); m->access_flags().print_on(tty); if (m->is_default_method()) { tty->print("default"); } tty->cr(); } 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); } else { flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); } break; default: assert(false, "bad CallInfo"); return NULL; } // @CallerSensitive annotation detected if (m->caller_sensitive()) { flags |= CALLER_SENSITIVE; } Handle resolved_method = info.resolved_method_name(); assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(), "Should not change after link resolultion"); oop mname_oop = mname(); java_lang_invoke_MemberName::set_flags (mname_oop, flags); java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); // Note: name and type can be lazily computed by resolve_MemberName, // if Java code needs them as resolved String and MethodType objects. // 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. 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); 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_method (mname_oop, NULL); 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/VarHandle classes. // * It has a single formal parameter of type Object[]. // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. // * 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() && klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { return false; } // Look up signature polymorphic method with polymorphic return type Symbol* poly_sig = vmSymbols::object_array_object_signature(); InstanceKlass* iklass = InstanceKlass::cast(klass); Method* m = iklass->find_method(name, poly_sig); if (m != NULL) { int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; int flags = m->access_flags().as_int(); if ((flags & required) == required) { return true; } } // Look up signature polymorphic method with non-polymorphic (non Object) return type int me; int ms = iklass->find_method_by_name(name, &me); if (ms == -1) return false; for (; ms < me; ms++) { Method* m = iklass->methods()->at(ms); int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; int flags = m->access_flags().as_int(); if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { return true; } } return false; } Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(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(); default: fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); return 0; } } Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { switch(id) { case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; default: fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); return Bytecodes::_illegal; } } 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; default: fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(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; default: break; } // 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; } // Cover the case of methods on VarHandle. Klass* vh_klass = SystemDictionary::well_known_klass( SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); if (vh_klass != NULL && is_method_handle_invoke_name(vh_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() || klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 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, THREAD); } else if (java_lang_Class::is_instance(type_str)) { return java_lang_Class::as_signature(type_str, false, THREAD); } else if (java_lang_String::is_instance_inlined(type_str)) { if (intern_if_not_found) { return java_lang_String::as_symbol(type_str, THREAD); } 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("%s", 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, Klass* caller, 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); } InstanceKlass* defc = NULL; { Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); if (defc_klass == NULL) return empty; // a primitive; no resolution possible if (!defc_klass->is_instance_klass()) { if (!defc_klass->is_array_klass()) return empty; defc_klass = SystemDictionary::Object_klass(); } defc = InstanceKlass::cast(defc_klass); } if (defc == 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 LinkInfo::AccessCheck access_check = caller != NULL ? LinkInfo::needs_access_check : LinkInfo::skip_access_check; // Time to do the lookup. switch (flags & ALL_KINDS) { case IS_METHOD: { CallInfo result; LinkInfo link_info(defc, name, type, caller, access_check); { assert(!HAS_PENDING_EXCEPTION, ""); if (ref_kind == JVM_REF_invokeStatic) { LinkResolver::resolve_static_call(result, link_info, false, THREAD); } else if (ref_kind == JVM_REF_invokeInterface) { LinkResolver::resolve_interface_call(result, Handle(), defc, link_info, false, THREAD); } else if (mh_invoke_id != vmIntrinsics::_none) { assert(!is_signature_polymorphic_static(mh_invoke_id), ""); LinkResolver::resolve_handle_call(result, link_info, THREAD); } else if (ref_kind == JVM_REF_invokeSpecial) { LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); } else if (ref_kind == JVM_REF_invokeVirtual) { LinkResolver::resolve_virtual_call(result, Handle(), defc, link_info, false, THREAD); } else { assert(false, "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); } result.set_resolved_method_name(CHECK_(empty)); oop mname2 = init_method_MemberName(mname, result); return Handle(THREAD, mname2); } case IS_CONSTRUCTOR: { CallInfo result; LinkInfo link_info(defc, name, type, caller, access_check); { assert(!HAS_PENDING_EXCEPTION, ""); if (name == vmSymbols::object_initializer_name()) { LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); } else { break; // will throw after end of switch } if (HAS_PENDING_EXCEPTION) { return empty; } } assert(result.is_statically_bound(), ""); result.set_resolved_method_name(CHECK_(empty)); 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, ""); LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, 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()), ""); 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: { Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); if (vmtarget == NULL) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); } methodHandle m(THREAD, vmtarget); DEBUG_ONLY(vmtarget = NULL); // safety 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 oop 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: { oop clazz = java_lang_invoke_MemberName::clazz(mname()); if (clazz == NULL) { THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); } InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); DEBUG_ONLY(clazz = NULL); // safety int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 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_name) { //not java_lang_String::create_from_symbol; let's intern member names oop 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 (THREAD, field_signature_type_or_null(fd.signature())); if (type.is_null()) { type = 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(Klass* k, Symbol* name, Symbol* sig, int mflags, Klass* caller, int skip, objArrayHandle results, TRAPS) { // %%% take caller into account! Thread* thread = Thread::current(); if (k == NULL || !k->is_instance_klass()) 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) { InstanceKlass* ik = InstanceKlass::cast(k); for (FieldStream st(ik, 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 } InstanceKlass* ik = InstanceKlass::cast(k); for (MethodStream st(ik, 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, NULL, CHECK_0); 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; } // Is it safe to remove stale entries from a dependency list? static bool safe_to_expunge() { // Since parallel GC threads can concurrently iterate over a dependency // list during safepoint, it is safe to remove entries only when // CodeCache lock is held. return CodeCache_lock->owned_by_self(); } void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { assert_locked_or_safepoint(CodeCache_lock); oop context = java_lang_invoke_CallSite::context(call_site); DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); // Try to purge stale entries on updates. // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, // in order to avoid memory leak, stale entries are purged whenever a dependency list // is changed (both on addition and removal). Though memory reclamation is delayed, // it avoids indefinite memory usage growth. deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); } void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { assert_locked_or_safepoint(CodeCache_lock); oop context = java_lang_invoke_CallSite::context(call_site); DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); } void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { assert_lock_strong(Compile_lock); int marked = 0; CallSiteDepChange changes(call_site, target); { NoSafepointVerifier nsv; MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); oop context = java_lang_invoke_CallSite::context(call_site()); DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); marked = deps.mark_dependent_nmethods(changes); } if (marked > 0) { // At least one nmethod has been marked for deoptimization. VM_Deoptimize op; VMThread::execute(&op); } } void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { if (TraceMethodHandles) { const char* name = vmIntrinsics::name_at(iid); if (*name == '_') name += 1; const size_t len = strlen(name) + 50; char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); const char* suffix = ""; if (is_signature_polymorphic(iid)) { if (is_signature_polymorphic_static(iid)) suffix = "/static"; else suffix = "/private"; } jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); trace_method_handle(_masm, qname); // Note: Don't free the allocated char array because it's used // during runtime. } } // // 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. // #ifndef PRODUCT #define EACH_NAMED_CON(template, requirement) \ 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) \ /*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, CHECK); } 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->is_objArray_klass()) { reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); } // Reflection::verify_class_access can only handle instance classes. if (reference_klass != NULL && reference_klass->is_instance_klass()) { // Emulate LinkResolver::check_klass_accessability. Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); if (caller != SystemDictionary::Object_klass() && Reflection::verify_class_access(caller, InstanceKlass::cast(reference_klass), true) != Reflection::ACCESS_OK) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); } } } Klass* caller = caller_jh == NULL ? NULL : java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); Handle resolved = MethodHandles::resolve_MemberName(mname, caller, 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_NoSuchFieldError(), "field resolution failed"); } else if ((flags & ALL_KINDS) == IS_METHOD || (flags & ALL_KINDS) == IS_CONSTRUCTOR) { THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "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::clazz(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()); objArrayHandle result = oopFactory::new_objArray_handle(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); int flags = java_lang_invoke_MemberName::flags(mname()); if ((flags & IS_FIELD) != 0) { x = java_lang_invoke_MemberName::clazz(mname()); } else { Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); x = mname(); } 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; Klass* k = 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 } Klass* caller = NULL; if (caller_jh != NULL) { oop caller_oop = JNIHandles::resolve_non_null(caller_jh); if (!java_lang_Class::is_instance(caller_oop)) return -1; caller = 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, CHECK_0); // 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_non_null(target_jh)); { // Walk all nmethods depending on this call site. MutexLocker mu(Compile_lock, thread); MethodHandles::flush_dependent_nmethods(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_non_null(target_jh)); { // Walk all nmethods depending on this call site. MutexLocker mu(Compile_lock, thread); MethodHandles::flush_dependent_nmethods(call_site, target); java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); } } JVM_END // It is called by a Cleaner object which ensures that dropped CallSites properly // deallocate their dependency information. JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); { // Walk all nmethods depending on this call site. MutexLocker mu1(Compile_lock, thread); int marked = 0; { NoSafepointVerifier nsv; MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); assert(safe_to_expunge(), "removal is not safe"); DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); marked = deps.remove_all_dependents(); } if (marked > 0) { // At least one nmethod has been marked for deoptimization VM_Deoptimize op; VMThread::execute(&op); } } } 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 CTX JLINV "MethodHandleNatives$CallSiteContext;" #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)}, // 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 "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, {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)} }; /** * This one function is exported, used by NativeLookup. */ JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { assert(!MethodHandles::enabled(), "must not be enabled"); assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); { ThreadToNativeFromVM ttnfv(thread); int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); guarantee(status == JNI_OK && !env->ExceptionOccurred(), "register java.lang.invoke.MethodHandleNative natives"); status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); guarantee(status == JNI_OK && !env->ExceptionOccurred(), "register java.lang.invoke.MethodHandle natives"); } if (TraceInvokeDynamic) { tty->print_cr("MethodHandle support loaded (using LambdaForms)"); } MethodHandles::set_enabled(true); } JVM_END