aoqi@0: /*
aoqi@0:  * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "classfile/symbolTable.hpp"
aoqi@0: #include "compiler/compileBroker.hpp"
aoqi@0: #include "interpreter/interpreter.hpp"
aoqi@0: #include "interpreter/oopMapCache.hpp"
aoqi@0: #include "memory/allocation.inline.hpp"
aoqi@0: #include "memory/oopFactory.hpp"
aoqi@0: #include "prims/jvmtiRedefineClassesTrace.hpp"
aoqi@0: #include "prims/methodHandles.hpp"
aoqi@0: #include "runtime/compilationPolicy.hpp"
aoqi@0: #include "runtime/javaCalls.hpp"
aoqi@0: #include "runtime/reflection.hpp"
aoqi@0: #include "runtime/signature.hpp"
aoqi@0: #include "runtime/stubRoutines.hpp"
aoqi@0: 
aoqi@0: 
aoqi@0: /*
aoqi@0:  * JSR 292 reference implementation: method handles
aoqi@0:  * The JDK 7 reference implementation represented method handle
aoqi@0:  * combinations as chains.  Each link in the chain had a "vmentry"
aoqi@0:  * field which pointed at a bit of assembly code which performed
aoqi@0:  * one transformation before dispatching to the next link in the chain.
aoqi@0:  *
aoqi@0:  * The current reference implementation pushes almost all code generation
aoqi@0:  * responsibility to (trusted) Java code.  A method handle contains a
aoqi@0:  * pointer to its "LambdaForm", which embodies all details of the method
aoqi@0:  * handle's behavior.  The LambdaForm is a normal Java object, managed
aoqi@0:  * by a runtime coded in Java.
aoqi@0:  */
aoqi@0: 
aoqi@0: bool MethodHandles::_enabled = false; // set true after successful native linkage
aoqi@0: MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
aoqi@0: 
aoqi@0: //------------------------------------------------------------------------------
aoqi@0: // MethodHandles::generate_adapters
aoqi@0: //
aoqi@0: void MethodHandles::generate_adapters() {
aoqi@0:   if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL)  return;
aoqi@0: 
aoqi@0:   assert(_adapter_code == NULL, "generate only once");
aoqi@0: 
aoqi@0:   ResourceMark rm;
aoqi@0:   TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
aoqi@0:   _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
aoqi@0:   if (_adapter_code == NULL)
aoqi@0:     vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
aoqi@0:                           "CodeCache: no room for MethodHandles adapters");
aoqi@0:   {
aoqi@0:     CodeBuffer code(_adapter_code);
aoqi@0:     MethodHandlesAdapterGenerator g(&code);
aoqi@0:     g.generate();
aoqi@0:     code.log_section_sizes("MethodHandlesAdapterBlob");
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: //------------------------------------------------------------------------------
aoqi@0: // MethodHandlesAdapterGenerator::generate
aoqi@0: //
aoqi@0: void MethodHandlesAdapterGenerator::generate() {
aoqi@0:   // Generate generic method handle adapters.
aoqi@0:   // Generate interpreter entries
aoqi@0:   for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
aoqi@0:        mk <= Interpreter::method_handle_invoke_LAST;
aoqi@0:        mk = Interpreter::MethodKind(1 + (int)mk)) {
aoqi@0:     vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
aoqi@0:     StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
aoqi@0:     address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
aoqi@0:     if (entry != NULL) {
aoqi@0:       Interpreter::set_entry_for_kind(mk, entry);
aoqi@0:     }
aoqi@0:     // If the entry is not set, it will throw AbstractMethodError.
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void MethodHandles::set_enabled(bool z) {
aoqi@0:   if (_enabled != z) {
aoqi@0:     guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
aoqi@0:     _enabled = z;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: // MemberName support
aoqi@0: 
aoqi@0: // import java_lang_invoke_MemberName.*
aoqi@0: enum {
aoqi@0:   IS_METHOD            = java_lang_invoke_MemberName::MN_IS_METHOD,
aoqi@0:   IS_CONSTRUCTOR       = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
aoqi@0:   IS_FIELD             = java_lang_invoke_MemberName::MN_IS_FIELD,
aoqi@0:   IS_TYPE              = java_lang_invoke_MemberName::MN_IS_TYPE,
aoqi@0:   CALLER_SENSITIVE     = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
aoqi@0:   REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
aoqi@0:   REFERENCE_KIND_MASK  = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
aoqi@0:   SEARCH_SUPERCLASSES  = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
aoqi@0:   SEARCH_INTERFACES    = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
aoqi@0:   ALL_KINDS      = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
aoqi@0: };
aoqi@0: 
aoqi@0: Handle MethodHandles::new_MemberName(TRAPS) {
aoqi@0:   Handle empty;
aoqi@0:   instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
aoqi@0:   if (!k->is_initialized())  k->initialize(CHECK_(empty));
aoqi@0:   return Handle(THREAD, k->allocate_instance(THREAD));
aoqi@0: }
aoqi@0: 
aoqi@0: oop MethodHandles::init_MemberName(Handle mname, Handle target) {
aoqi@0:   // This method is used from java.lang.invoke.MemberName constructors.
aoqi@0:   // It fills in the new MemberName from a java.lang.reflect.Member.
aoqi@0:   Thread* thread = Thread::current();
aoqi@0:   oop target_oop = target();
aoqi@0:   Klass* target_klass = target_oop->klass();
aoqi@0:   if (target_klass == SystemDictionary::reflect_Field_klass()) {
aoqi@0:     oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
aoqi@0:     int slot  = java_lang_reflect_Field::slot(target_oop);  // fd.index()
aoqi@0:     KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
aoqi@0:     if (!k.is_null() && k->oop_is_instance()) {
aoqi@0:       fieldDescriptor fd(InstanceKlass::cast(k()), slot);
aoqi@0:       oop mname2 = init_field_MemberName(mname, fd);
aoqi@0:       if (mname2 != NULL) {
aoqi@0:         // Since we have the reified name and type handy, add them to the result.
aoqi@0:         if (java_lang_invoke_MemberName::name(mname2) == NULL)
aoqi@0:           java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
aoqi@0:         if (java_lang_invoke_MemberName::type(mname2) == NULL)
aoqi@0:           java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
aoqi@0:       }
aoqi@0:       return mname2;
aoqi@0:     }
aoqi@0:   } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
aoqi@0:     oop clazz  = java_lang_reflect_Method::clazz(target_oop);
aoqi@0:     int slot   = java_lang_reflect_Method::slot(target_oop);
aoqi@0:     KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
aoqi@0:     if (!k.is_null() && k->oop_is_instance()) {
aoqi@0:       Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
aoqi@0:       if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
aoqi@0:         return NULL;            // do not resolve unless there is a concrete signature
aoqi@0:       CallInfo info(m, k());
aoqi@0:       return init_method_MemberName(mname, info);
aoqi@0:     }
aoqi@0:   } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
aoqi@0:     oop clazz  = java_lang_reflect_Constructor::clazz(target_oop);
aoqi@0:     int slot   = java_lang_reflect_Constructor::slot(target_oop);
aoqi@0:     KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
aoqi@0:     if (!k.is_null() && k->oop_is_instance()) {
aoqi@0:       Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
aoqi@0:       if (m == NULL)  return NULL;
aoqi@0:       CallInfo info(m, k());
aoqi@0:       return init_method_MemberName(mname, info);
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
aoqi@0:   assert(info.resolved_appendix().is_null(), "only normal methods here");
aoqi@0:   methodHandle m = info.resolved_method();
aoqi@0:   KlassHandle m_klass = m->method_holder();
aoqi@0:   int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
aoqi@0:   int vmindex = Method::invalid_vtable_index;
aoqi@0: 
aoqi@0:   switch (info.call_kind()) {
aoqi@0:   case CallInfo::itable_call:
aoqi@0:     vmindex = info.itable_index();
aoqi@0:     // More importantly, the itable index only works with the method holder.
aoqi@0:     assert(m_klass->verify_itable_index(vmindex), "");
aoqi@0:     flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
aoqi@0:     if (TraceInvokeDynamic) {
aoqi@0:       ResourceMark rm;
aoqi@0:       tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
aoqi@0:             Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
aoqi@0:             vmindex);
aoqi@0:        m->access_flags().print_on(tty);
aoqi@0:        if (!m->is_abstract()) {
aoqi@0:          tty->print("default");
aoqi@0:        }
aoqi@0:        tty->cr();
aoqi@0:     }
aoqi@0:     break;
aoqi@0: 
aoqi@0:   case CallInfo::vtable_call:
aoqi@0:     vmindex = info.vtable_index();
aoqi@0:     flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
aoqi@0:     assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
aoqi@0:     if (m_klass->is_interface()) {
aoqi@0:       // This is a vtable call to an interface method (abstract "miranda method" or default method).
aoqi@0:       // The vtable index is meaningless without a class (not interface) receiver type, so get one.
aoqi@0:       // (LinkResolver should help us figure this out.)
aoqi@0:       KlassHandle m_klass_non_interface = info.resolved_klass();
aoqi@0:       if (m_klass_non_interface->is_interface()) {
aoqi@0:         m_klass_non_interface = SystemDictionary::Object_klass();
aoqi@0: #ifdef ASSERT
aoqi@0:         { ResourceMark rm;
aoqi@0:           Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
aoqi@0:           assert(m->name() == m2->name() && m->signature() == m2->signature(),
aoqi@0:                  err_msg("at %d, %s != %s", vmindex,
aoqi@0:                          m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
aoqi@0:         }
aoqi@0: #endif //ASSERT
aoqi@0:       }
aoqi@0:       if (!m->is_public()) {
aoqi@0:         assert(m->is_public(), "virtual call must be to public interface method");
aoqi@0:         return NULL;  // elicit an error later in product build
aoqi@0:       }
aoqi@0:       assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
aoqi@0:       m_klass = m_klass_non_interface;
aoqi@0:     }
aoqi@0:     if (TraceInvokeDynamic) {
aoqi@0:       ResourceMark rm;
aoqi@0:       tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
aoqi@0:             Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
aoqi@0:             m_klass->internal_name(), vmindex);
aoqi@0:        m->access_flags().print_on(tty);
aoqi@0:        if (m->is_default_method()) {
aoqi@0:          tty->print("default");
aoqi@0:        }
aoqi@0:        tty->cr();
aoqi@0:     }
aoqi@0:     break;
aoqi@0: 
aoqi@0:   case CallInfo::direct_call:
aoqi@0:     vmindex = Method::nonvirtual_vtable_index;
aoqi@0:     if (m->is_static()) {
aoqi@0:       flags |= IS_METHOD      | (JVM_REF_invokeStatic  << REFERENCE_KIND_SHIFT);
aoqi@0:     } else if (m->is_initializer()) {
aoqi@0:       flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
aoqi@0:     } else {
aoqi@0:       flags |= IS_METHOD      | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
aoqi@0:     }
aoqi@0:     break;
aoqi@0: 
aoqi@0:   default:  assert(false, "bad CallInfo");  return NULL;
aoqi@0:   }
aoqi@0: 
aoqi@0:   // @CallerSensitive annotation detected
aoqi@0:   if (m->caller_sensitive()) {
aoqi@0:     flags |= CALLER_SENSITIVE;
aoqi@0:   }
aoqi@0: 
aoqi@0:   oop mname_oop = mname();
aoqi@0:   java_lang_invoke_MemberName::set_flags(   mname_oop, flags);
aoqi@0:   java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
aoqi@0:   java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex);   // vtable/itable index
aoqi@0:   java_lang_invoke_MemberName::set_clazz(   mname_oop, m_klass->java_mirror());
aoqi@0:   // Note:  name and type can be lazily computed by resolve_MemberName,
aoqi@0:   // if Java code needs them as resolved String and MethodType objects.
aoqi@0:   // The clazz must be eagerly stored, because it provides a GC
aoqi@0:   // root to help keep alive the Method*.
aoqi@0:   // If relevant, the vtable or itable value is stored as vmindex.
aoqi@0:   // This is done eagerly, since it is readily available without
aoqi@0:   // constructing any new objects.
aoqi@0:   // TO DO: maybe intern mname_oop
aoqi@0:   m->method_holder()->add_member_name(m->method_idnum(), mname);
aoqi@0: 
aoqi@0:   return mname();
aoqi@0: }
aoqi@0: 
aoqi@0: oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
aoqi@0:   int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
aoqi@0:   flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
aoqi@0:   if (is_setter)  flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
aoqi@0:   Metadata* vmtarget = fd.field_holder();
aoqi@0:   int vmindex        = fd.offset();  // determines the field uniquely when combined with static bit
aoqi@0:   oop mname_oop = mname();
aoqi@0:   java_lang_invoke_MemberName::set_flags(mname_oop,    flags);
aoqi@0:   java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
aoqi@0:   java_lang_invoke_MemberName::set_vmindex(mname_oop,  vmindex);
aoqi@0:   java_lang_invoke_MemberName::set_clazz(mname_oop,    fd.field_holder()->java_mirror());
aoqi@0:   oop type = field_signature_type_or_null(fd.signature());
aoqi@0:   oop name = field_name_or_null(fd.name());
aoqi@0:   if (name != NULL)
aoqi@0:     java_lang_invoke_MemberName::set_name(mname_oop,   name);
aoqi@0:   if (type != NULL)
aoqi@0:     java_lang_invoke_MemberName::set_type(mname_oop,   type);
aoqi@0:   // Note:  name and type can be lazily computed by resolve_MemberName,
aoqi@0:   // if Java code needs them as resolved String and Class objects.
aoqi@0:   // Note that the incoming type oop might be pre-resolved (non-null).
aoqi@0:   // The base clazz and field offset (vmindex) must be eagerly stored,
aoqi@0:   // because they unambiguously identify the field.
aoqi@0:   // Although the fieldDescriptor::_index would also identify the field,
aoqi@0:   // we do not use it, because it is harder to decode.
aoqi@0:   // TO DO: maybe intern mname_oop
aoqi@0:   return mname();
aoqi@0: }
aoqi@0: 
aoqi@0: // JVM 2.9 Special Methods:
aoqi@0: // A method is signature polymorphic if and only if all of the following conditions hold :
aoqi@0: // * It is declared in the java.lang.invoke.MethodHandle class.
aoqi@0: // * It has a single formal parameter of type Object[].
aoqi@0: // * It has a return type of Object.
aoqi@0: // * It has the ACC_VARARGS and ACC_NATIVE flags set.
aoqi@0: bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
aoqi@0:   if (klass == NULL)
aoqi@0:     return false;
aoqi@0:   // The following test will fail spuriously during bootstrap of MethodHandle itself:
aoqi@0:   //    if (klass != SystemDictionary::MethodHandle_klass())
aoqi@0:   // Test the name instead:
aoqi@0:   if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
aoqi@0:     return false;
aoqi@0:   Symbol* poly_sig = vmSymbols::object_array_object_signature();
aoqi@0:   Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
aoqi@0:   if (m == NULL)  return false;
aoqi@0:   int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
aoqi@0:   int flags = m->access_flags().as_int();
aoqi@0:   return (flags & required) == required;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
aoqi@0:   assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
aoqi@0:   switch (iid) {
aoqi@0:   case vmIntrinsics::_invokeBasic:      return vmSymbols::invokeBasic_name();
aoqi@0:   case vmIntrinsics::_linkToVirtual:    return vmSymbols::linkToVirtual_name();
aoqi@0:   case vmIntrinsics::_linkToStatic:     return vmSymbols::linkToStatic_name();
aoqi@0:   case vmIntrinsics::_linkToSpecial:    return vmSymbols::linkToSpecial_name();
aoqi@0:   case vmIntrinsics::_linkToInterface:  return vmSymbols::linkToInterface_name();
aoqi@0:   }
aoqi@0:   assert(false, "");
aoqi@0:   return 0;
aoqi@0: }
aoqi@0: 
aoqi@0: int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
aoqi@0:   switch (iid) {
aoqi@0:   case vmIntrinsics::_invokeBasic:      return 0;
aoqi@0:   case vmIntrinsics::_linkToVirtual:    return JVM_REF_invokeVirtual;
aoqi@0:   case vmIntrinsics::_linkToStatic:     return JVM_REF_invokeStatic;
aoqi@0:   case vmIntrinsics::_linkToSpecial:    return JVM_REF_invokeSpecial;
aoqi@0:   case vmIntrinsics::_linkToInterface:  return JVM_REF_invokeInterface;
aoqi@0:   }
aoqi@0:   assert(false, err_msg("iid=%d", iid));
aoqi@0:   return 0;
aoqi@0: }
aoqi@0: 
aoqi@0: vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
aoqi@0:   vmSymbols::SID name_id = vmSymbols::find_sid(name);
aoqi@0:   switch (name_id) {
aoqi@0:   // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
aoqi@0:   case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name):           return vmIntrinsics::_invokeGeneric;
aoqi@0:   // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
aoqi@0:   case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name):      return vmIntrinsics::_invokeBasic;
aoqi@0: 
aoqi@0:   // There is one static signature-polymorphic method for each JVM invocation mode.
aoqi@0:   case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name):    return vmIntrinsics::_linkToVirtual;
aoqi@0:   case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name):     return vmIntrinsics::_linkToStatic;
aoqi@0:   case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name):    return vmIntrinsics::_linkToSpecial;
aoqi@0:   case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name):  return vmIntrinsics::_linkToInterface;
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Cover the case of invokeExact and any future variants of invokeFoo.
aoqi@0:   Klass* mh_klass = SystemDictionary::well_known_klass(
aoqi@0:                               SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
aoqi@0:   if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
aoqi@0:     return vmIntrinsics::_invokeGeneric;
aoqi@0: 
aoqi@0:   // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
aoqi@0:   // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
aoqi@0:   return vmIntrinsics::_none;
aoqi@0: }
aoqi@0: 
aoqi@0: vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
aoqi@0:   if (klass != NULL &&
aoqi@0:       klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
aoqi@0:     vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
aoqi@0:     if (iid != vmIntrinsics::_none)
aoqi@0:       return iid;
aoqi@0:     if (is_method_handle_invoke_name(klass, name))
aoqi@0:       return vmIntrinsics::_invokeGeneric;
aoqi@0:   }
aoqi@0:   return vmIntrinsics::_none;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: // convert the external string or reflective type to an internal signature
aoqi@0: Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
aoqi@0:   if (java_lang_invoke_MethodType::is_instance(type_str)) {
aoqi@0:     return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
aoqi@0:   } else if (java_lang_Class::is_instance(type_str)) {
aoqi@0:     return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
aoqi@0:   } else if (java_lang_String::is_instance(type_str)) {
aoqi@0:     if (intern_if_not_found) {
aoqi@0:       return java_lang_String::as_symbol(type_str, CHECK_NULL);
aoqi@0:     } else {
aoqi@0:       return java_lang_String::as_symbol_or_null(type_str);
aoqi@0:     }
aoqi@0:   } else {
aoqi@0:     THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: static const char OBJ_SIG[] = "Ljava/lang/Object;";
aoqi@0: enum { OBJ_SIG_LEN = 18 };
aoqi@0: 
aoqi@0: bool MethodHandles::is_basic_type_signature(Symbol* sig) {
aoqi@0:   assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
aoqi@0:   assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
aoqi@0:   const int len = sig->utf8_length();
aoqi@0:   for (int i = 0; i < len; i++) {
aoqi@0:     switch (sig->byte_at(i)) {
aoqi@0:     case 'L':
aoqi@0:       // only java/lang/Object is valid here
aoqi@0:       if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
aoqi@0:         return false;
aoqi@0:       i += OBJ_SIG_LEN-1;  //-1 because of i++ in loop
aoqi@0:       continue;
aoqi@0:     case '(': case ')': case 'V':
aoqi@0:     case 'I': case 'J': case 'F': case 'D':
aoqi@0:       continue;
aoqi@0:     //case '[':
aoqi@0:     //case 'Z': case 'B': case 'C': case 'S':
aoqi@0:     default:
aoqi@0:       return false;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
aoqi@0:   Symbol* bsig = NULL;
aoqi@0:   if (sig == NULL) {
aoqi@0:     return sig;
aoqi@0:   } else if (is_basic_type_signature(sig)) {
aoqi@0:     sig->increment_refcount();
aoqi@0:     return sig;  // that was easy
aoqi@0:   } else if (sig->byte_at(0) != '(') {
aoqi@0:     BasicType bt = char2type(sig->byte_at(0));
aoqi@0:     if (is_subword_type(bt)) {
aoqi@0:       bsig = vmSymbols::int_signature();
aoqi@0:     } else {
aoqi@0:       assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
aoqi@0:       bsig = vmSymbols::object_signature();
aoqi@0:     }
aoqi@0:   } else {
aoqi@0:     ResourceMark rm;
aoqi@0:     stringStream buffer(128);
aoqi@0:     buffer.put('(');
aoqi@0:     int arg_pos = 0, keep_arg_pos = -1;
aoqi@0:     if (keep_last_arg)
aoqi@0:       keep_arg_pos = ArgumentCount(sig).size() - 1;
aoqi@0:     for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
aoqi@0:       BasicType bt = ss.type();
aoqi@0:       size_t this_arg_pos = buffer.size();
aoqi@0:       if (ss.at_return_type()) {
aoqi@0:         buffer.put(')');
aoqi@0:       }
aoqi@0:       if (arg_pos == keep_arg_pos) {
aoqi@0:         buffer.write((char*) ss.raw_bytes(),
aoqi@0:                      (int)   ss.raw_length());
aoqi@0:       } else if (bt == T_OBJECT || bt == T_ARRAY) {
aoqi@0:         buffer.write(OBJ_SIG, OBJ_SIG_LEN);
aoqi@0:       } else {
aoqi@0:         if (is_subword_type(bt))
aoqi@0:           bt = T_INT;
aoqi@0:         buffer.put(type2char(bt));
aoqi@0:       }
aoqi@0:       arg_pos++;
aoqi@0:     }
aoqi@0:     const char* sigstr =       buffer.base();
aoqi@0:     int         siglen = (int) buffer.size();
aoqi@0:     bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
aoqi@0:   }
aoqi@0:   assert(is_basic_type_signature(bsig) ||
aoqi@0:          // detune assert in case the injected argument is not a basic type:
aoqi@0:          keep_last_arg, "");
aoqi@0:   return bsig;
aoqi@0: }
aoqi@0: 
aoqi@0: void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
aoqi@0:                                                      Symbol* sig,
aoqi@0:                                                      bool keep_arrays,
aoqi@0:                                                      bool keep_basic_names) {
aoqi@0:   st = st ? st : tty;
aoqi@0:   int len  = sig->utf8_length();
aoqi@0:   int array = 0;
aoqi@0:   bool prev_type = false;
aoqi@0:   for (int i = 0; i < len; i++) {
aoqi@0:     char ch = sig->byte_at(i);
aoqi@0:     switch (ch) {
aoqi@0:     case '(': case ')':
aoqi@0:       prev_type = false;
aoqi@0:       st->put(ch);
aoqi@0:       continue;
aoqi@0:     case '[':
aoqi@0:       if (!keep_basic_names && keep_arrays)
aoqi@0:         st->put(ch);
aoqi@0:       array++;
aoqi@0:       continue;
aoqi@0:     case 'L':
aoqi@0:       {
aoqi@0:         if (prev_type)  st->put(',');
aoqi@0:         int start = i+1, slash = start;
aoqi@0:         while (++i < len && (ch = sig->byte_at(i)) != ';') {
aoqi@0:           if (ch == '/' || ch == '.' || ch == '$')  slash = i+1;
aoqi@0:         }
aoqi@0:         if (slash < i)  start = slash;
aoqi@0:         if (!keep_basic_names) {
aoqi@0:           st->put('L');
aoqi@0:         } else {
aoqi@0:           for (int j = start; j < i; j++)
aoqi@0:             st->put(sig->byte_at(j));
aoqi@0:           prev_type = true;
aoqi@0:         }
aoqi@0:         break;
aoqi@0:       }
aoqi@0:     default:
aoqi@0:       {
aoqi@0:         if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
aoqi@0:           ch = '[';
aoqi@0:           array = 0;
aoqi@0:         }
aoqi@0:         if (prev_type)  st->put(',');
aoqi@0:         const char* n = NULL;
aoqi@0:         if (keep_basic_names)
aoqi@0:           n = type2name(char2type(ch));
aoqi@0:         if (n == NULL) {
aoqi@0:           // unknown letter, or we don't want to know its name
aoqi@0:           st->put(ch);
aoqi@0:         } else {
aoqi@0:           st->print("%s", n);
aoqi@0:           prev_type = true;
aoqi@0:         }
aoqi@0:         break;
aoqi@0:       }
aoqi@0:     }
aoqi@0:     // Switch break goes here to take care of array suffix:
aoqi@0:     if (prev_type) {
aoqi@0:       while (array > 0) {
aoqi@0:         st->print("[]");
aoqi@0:         --array;
aoqi@0:       }
aoqi@0:     }
aoqi@0:     array = 0;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: 
aoqi@0: static oop object_java_mirror() {
aoqi@0:   return SystemDictionary::Object_klass()->java_mirror();
aoqi@0: }
aoqi@0: 
aoqi@0: oop MethodHandles::field_name_or_null(Symbol* s) {
aoqi@0:   if (s == NULL)  return NULL;
aoqi@0:   return StringTable::lookup(s);
aoqi@0: }
aoqi@0: 
aoqi@0: oop MethodHandles::field_signature_type_or_null(Symbol* s) {
aoqi@0:   if (s == NULL)  return NULL;
aoqi@0:   BasicType bt = FieldType::basic_type(s);
aoqi@0:   if (is_java_primitive(bt)) {
aoqi@0:     assert(s->utf8_length() == 1, "");
aoqi@0:     return java_lang_Class::primitive_mirror(bt);
aoqi@0:   }
aoqi@0:   // Here are some more short cuts for common types.
aoqi@0:   // They are optional, since reference types can be resolved lazily.
aoqi@0:   if (bt == T_OBJECT) {
aoqi@0:     if (s == vmSymbols::object_signature()) {
aoqi@0:       return object_java_mirror();
aoqi@0:     } else if (s == vmSymbols::class_signature()) {
aoqi@0:       return SystemDictionary::Class_klass()->java_mirror();
aoqi@0:     } else if (s == vmSymbols::string_signature()) {
aoqi@0:       return SystemDictionary::String_klass()->java_mirror();
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: // An unresolved member name is a mere symbolic reference.
aoqi@0: // Resolving it plants a vmtarget/vmindex in it,
aoqi@0: // which refers directly to JVM internals.
aoqi@0: Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
aoqi@0:   Handle empty;
aoqi@0:   assert(java_lang_invoke_MemberName::is_instance(mname()), "");
aoqi@0: 
aoqi@0:   if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
aoqi@0:     // Already resolved.
aoqi@0:     DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
aoqi@0:     assert(vmindex >= Method::nonvirtual_vtable_index, "");
aoqi@0:     return mname;
aoqi@0:   }
aoqi@0: 
aoqi@0:   Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
aoqi@0:   Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
aoqi@0:   Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
aoqi@0:   int    flags    =       java_lang_invoke_MemberName::flags(mname());
aoqi@0:   int    ref_kind =       (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
aoqi@0:   if (!ref_kind_is_valid(ref_kind)) {
aoqi@0:     THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
aoqi@0:   }
aoqi@0: 
aoqi@0:   DEBUG_ONLY(int old_vmindex);
aoqi@0:   assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
aoqi@0: 
aoqi@0:   if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
aoqi@0:     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
aoqi@0:   }
aoqi@0: 
aoqi@0:   instanceKlassHandle defc;
aoqi@0:   {
aoqi@0:     Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
aoqi@0:     if (defc_klass == NULL)  return empty;  // a primitive; no resolution possible
aoqi@0:     if (!defc_klass->oop_is_instance()) {
aoqi@0:       if (!defc_klass->oop_is_array())  return empty;
aoqi@0:       defc_klass = SystemDictionary::Object_klass();
aoqi@0:     }
aoqi@0:     defc = instanceKlassHandle(THREAD, defc_klass);
aoqi@0:   }
aoqi@0:   if (defc.is_null()) {
aoqi@0:     THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
aoqi@0:   }
aoqi@0:   defc->link_class(CHECK_(empty));  // possible safepoint
aoqi@0: 
aoqi@0:   // convert the external string name to an internal symbol
aoqi@0:   TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
aoqi@0:   if (name == NULL)  return empty;  // no such name
aoqi@0:   if (name == vmSymbols::class_initializer_name())
aoqi@0:     return empty; // illegal name
aoqi@0: 
aoqi@0:   vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
aoqi@0:   if ((flags & ALL_KINDS) == IS_METHOD &&
aoqi@0:       (defc() == SystemDictionary::MethodHandle_klass()) &&
aoqi@0:       (ref_kind == JVM_REF_invokeVirtual ||
aoqi@0:        ref_kind == JVM_REF_invokeSpecial ||
aoqi@0:        // static invocation mode is required for _linkToVirtual, etc.:
aoqi@0:        ref_kind == JVM_REF_invokeStatic)) {
aoqi@0:     vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
aoqi@0:     if (iid != vmIntrinsics::_none &&
aoqi@0:         ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
aoqi@0:       // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
aoqi@0:       // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
aoqi@0:       mh_invoke_id = iid;
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   // convert the external string or reflective type to an internal signature
aoqi@0:   TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
aoqi@0:   if (type == NULL)  return empty;  // no such signature exists in the VM
aoqi@0: 
aoqi@0:   // Time to do the lookup.
aoqi@0:   switch (flags & ALL_KINDS) {
aoqi@0:   case IS_METHOD:
aoqi@0:     {
aoqi@0:       CallInfo result;
aoqi@0:       {
aoqi@0:         assert(!HAS_PENDING_EXCEPTION, "");
aoqi@0:         if (ref_kind == JVM_REF_invokeStatic) {
aoqi@0:           LinkResolver::resolve_static_call(result,
aoqi@0:                         defc, name, type, caller, caller.not_null(), false, THREAD);
aoqi@0:         } else if (ref_kind == JVM_REF_invokeInterface) {
aoqi@0:           LinkResolver::resolve_interface_call(result, Handle(), defc,
aoqi@0:                         defc, name, type, caller, caller.not_null(), false, THREAD);
aoqi@0:         } else if (mh_invoke_id != vmIntrinsics::_none) {
aoqi@0:           assert(!is_signature_polymorphic_static(mh_invoke_id), "");
aoqi@0:           LinkResolver::resolve_handle_call(result,
aoqi@0:                         defc, name, type, caller, THREAD);
aoqi@0:         } else if (ref_kind == JVM_REF_invokeSpecial) {
aoqi@0:           LinkResolver::resolve_special_call(result,
aoqi@0:                         defc, name, type, caller, caller.not_null(), THREAD);
aoqi@0:         } else if (ref_kind == JVM_REF_invokeVirtual) {
aoqi@0:           LinkResolver::resolve_virtual_call(result, Handle(), defc,
aoqi@0:                         defc, name, type, caller, caller.not_null(), false, THREAD);
aoqi@0:         } else {
aoqi@0:           assert(false, err_msg("ref_kind=%d", ref_kind));
aoqi@0:         }
aoqi@0:         if (HAS_PENDING_EXCEPTION) {
aoqi@0:           return empty;
aoqi@0:         }
aoqi@0:       }
aoqi@0:       if (result.resolved_appendix().not_null()) {
aoqi@0:         // The resolved MemberName must not be accompanied by an appendix argument,
aoqi@0:         // since there is no way to bind this value into the MemberName.
aoqi@0:         // Caller is responsible to prevent this from happening.
aoqi@0:         THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
aoqi@0:       }
aoqi@0:       oop mname2 = init_method_MemberName(mname, result);
aoqi@0:       return Handle(THREAD, mname2);
aoqi@0:     }
aoqi@0:   case IS_CONSTRUCTOR:
aoqi@0:     {
aoqi@0:       CallInfo result;
aoqi@0:       {
aoqi@0:         assert(!HAS_PENDING_EXCEPTION, "");
aoqi@0:         if (name == vmSymbols::object_initializer_name()) {
aoqi@0:           LinkResolver::resolve_special_call(result,
aoqi@0:                         defc, name, type, caller, caller.not_null(), THREAD);
aoqi@0:         } else {
aoqi@0:           break;                // will throw after end of switch
aoqi@0:         }
aoqi@0:         if (HAS_PENDING_EXCEPTION) {
aoqi@0:           return empty;
aoqi@0:         }
aoqi@0:       }
aoqi@0:       assert(result.is_statically_bound(), "");
aoqi@0:       oop mname2 = init_method_MemberName(mname, result);
aoqi@0:       return Handle(THREAD, mname2);
aoqi@0:     }
aoqi@0:   case IS_FIELD:
aoqi@0:     {
aoqi@0:       fieldDescriptor result; // find_field initializes fd if found
aoqi@0:       {
aoqi@0:         assert(!HAS_PENDING_EXCEPTION, "");
aoqi@0:         LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
aoqi@0:         if (HAS_PENDING_EXCEPTION) {
aoqi@0:           return empty;
aoqi@0:         }
aoqi@0:       }
aoqi@0:       oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
aoqi@0:       return Handle(THREAD, mname2);
aoqi@0:     }
aoqi@0:   default:
aoqi@0:     THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
aoqi@0:   }
aoqi@0: 
aoqi@0:   return empty;
aoqi@0: }
aoqi@0: 
aoqi@0: // Conversely, a member name which is only initialized from JVM internals
aoqi@0: // may have null defc, name, and type fields.
aoqi@0: // Resolving it plants a vmtarget/vmindex in it,
aoqi@0: // which refers directly to JVM internals.
aoqi@0: void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
aoqi@0:   assert(java_lang_invoke_MemberName::is_instance(mname()), "");
aoqi@0:   Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
aoqi@0:   int vmindex  = java_lang_invoke_MemberName::vmindex(mname());
aoqi@0:   if (vmtarget == NULL) {
aoqi@0:     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
aoqi@0:   }
aoqi@0: 
aoqi@0:   bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
aoqi@0:   bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
aoqi@0:   bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
aoqi@0:   int flags      = java_lang_invoke_MemberName::flags(mname());
aoqi@0: 
aoqi@0:   if (suppress != 0) {
aoqi@0:     if (suppress & _suppress_defc)  have_defc = true;
aoqi@0:     if (suppress & _suppress_name)  have_name = true;
aoqi@0:     if (suppress & _suppress_type)  have_type = true;
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (have_defc && have_name && have_type)  return;  // nothing needed
aoqi@0: 
aoqi@0:   switch (flags & ALL_KINDS) {
aoqi@0:   case IS_METHOD:
aoqi@0:   case IS_CONSTRUCTOR:
aoqi@0:     {
aoqi@0:       assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
aoqi@0:       methodHandle m(THREAD, (Method*)vmtarget);
aoqi@0:       DEBUG_ONLY(vmtarget = NULL);  // safety
aoqi@0:       if (m.is_null())  break;
aoqi@0:       if (!have_defc) {
aoqi@0:         InstanceKlass* defc = m->method_holder();
aoqi@0:         java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
aoqi@0:       }
aoqi@0:       if (!have_name) {
aoqi@0:         //not java_lang_String::create_from_symbol; let's intern member names
aoqi@0:         Handle name = StringTable::intern(m->name(), CHECK);
aoqi@0:         java_lang_invoke_MemberName::set_name(mname(), name());
aoqi@0:       }
aoqi@0:       if (!have_type) {
aoqi@0:         Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
aoqi@0:         java_lang_invoke_MemberName::set_type(mname(), type());
aoqi@0:       }
aoqi@0:       return;
aoqi@0:     }
aoqi@0:   case IS_FIELD:
aoqi@0:     {
aoqi@0:       assert(vmtarget->is_klass(), "field vmtarget is Klass*");
aoqi@0:       if (!((Klass*) vmtarget)->oop_is_instance())  break;
aoqi@0:       instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
aoqi@0:       DEBUG_ONLY(vmtarget = NULL);  // safety
aoqi@0:       bool is_static = ((flags & JVM_ACC_STATIC) != 0);
aoqi@0:       fieldDescriptor fd; // find_field initializes fd if found
aoqi@0:       if (!defc->find_field_from_offset(vmindex, is_static, &fd))
aoqi@0:         break;                  // cannot expand
aoqi@0:       if (!have_defc) {
aoqi@0:         java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
aoqi@0:       }
aoqi@0:       if (!have_name) {
aoqi@0:         //not java_lang_String::create_from_symbol; let's intern member names
aoqi@0:         Handle name = StringTable::intern(fd.name(), CHECK);
aoqi@0:         java_lang_invoke_MemberName::set_name(mname(), name());
aoqi@0:       }
aoqi@0:       if (!have_type) {
aoqi@0:         // If it is a primitive field type, don't mess with short strings like "I".
aoqi@0:         Handle type = field_signature_type_or_null(fd.signature());
aoqi@0:         if (type.is_null()) {
aoqi@0:           java_lang_String::create_from_symbol(fd.signature(), CHECK);
aoqi@0:         }
aoqi@0:         java_lang_invoke_MemberName::set_type(mname(), type());
aoqi@0:       }
aoqi@0:       return;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
aoqi@0: }
aoqi@0: 
aoqi@0: int MethodHandles::find_MemberNames(KlassHandle k,
aoqi@0:                                     Symbol* name, Symbol* sig,
aoqi@0:                                     int mflags, KlassHandle caller,
aoqi@0:                                     int skip, objArrayHandle results) {
aoqi@0:   // %%% take caller into account!
aoqi@0: 
aoqi@0:   Thread* thread = Thread::current();
aoqi@0: 
aoqi@0:   if (k.is_null() || !k->oop_is_instance())  return -1;
aoqi@0: 
aoqi@0:   int rfill = 0, rlimit = results->length(), rskip = skip;
aoqi@0:   // overflow measurement:
aoqi@0:   int overflow = 0, overflow_limit = MAX2(1000, rlimit);
aoqi@0: 
aoqi@0:   int match_flags = mflags;
aoqi@0:   bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
aoqi@0:   bool search_intfc  = ((match_flags & SEARCH_INTERFACES)   != 0);
aoqi@0:   bool local_only = !(search_superc | search_intfc);
aoqi@0:   bool classes_only = false;
aoqi@0: 
aoqi@0:   if (name != NULL) {
aoqi@0:     if (name->utf8_length() == 0)  return 0; // a match is not possible
aoqi@0:   }
aoqi@0:   if (sig != NULL) {
aoqi@0:     if (sig->utf8_length() == 0)  return 0; // a match is not possible
aoqi@0:     if (sig->byte_at(0) == '(')
aoqi@0:       match_flags &= ~(IS_FIELD | IS_TYPE);
aoqi@0:     else
aoqi@0:       match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
aoqi@0:   }
aoqi@0: 
aoqi@0:   if ((match_flags & IS_TYPE) != 0) {
aoqi@0:     // NYI, and Core Reflection works quite well for this query
aoqi@0:   }
aoqi@0: 
aoqi@0:   if ((match_flags & IS_FIELD) != 0) {
aoqi@0:     for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
aoqi@0:       if (name != NULL && st.name() != name)
aoqi@0:           continue;
aoqi@0:       if (sig != NULL && st.signature() != sig)
aoqi@0:         continue;
aoqi@0:       // passed the filters
aoqi@0:       if (rskip > 0) {
aoqi@0:         --rskip;
aoqi@0:       } else if (rfill < rlimit) {
aoqi@0:         Handle result(thread, results->obj_at(rfill++));
aoqi@0:         if (!java_lang_invoke_MemberName::is_instance(result()))
aoqi@0:           return -99;  // caller bug!
aoqi@0:         oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
aoqi@0:         if (saved != result())
aoqi@0:           results->obj_at_put(rfill-1, saved);  // show saved instance to user
aoqi@0:       } else if (++overflow >= overflow_limit) {
aoqi@0:         match_flags = 0; break; // got tired of looking at overflow
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
aoqi@0:     // watch out for these guys:
aoqi@0:     Symbol* init_name   = vmSymbols::object_initializer_name();
aoqi@0:     Symbol* clinit_name = vmSymbols::class_initializer_name();
aoqi@0:     if (name == clinit_name)  clinit_name = NULL; // hack for exposing <clinit>
aoqi@0:     bool negate_name_test = false;
aoqi@0:     // fix name so that it captures the intention of IS_CONSTRUCTOR
aoqi@0:     if (!(match_flags & IS_METHOD)) {
aoqi@0:       // constructors only
aoqi@0:       if (name == NULL) {
aoqi@0:         name = init_name;
aoqi@0:       } else if (name != init_name) {
aoqi@0:         return 0;               // no constructors of this method name
aoqi@0:       }
aoqi@0:     } else if (!(match_flags & IS_CONSTRUCTOR)) {
aoqi@0:       // methods only
aoqi@0:       if (name == NULL) {
aoqi@0:         name = init_name;
aoqi@0:         negate_name_test = true; // if we see the name, we *omit* the entry
aoqi@0:       } else if (name == init_name) {
aoqi@0:         return 0;               // no methods of this constructor name
aoqi@0:       }
aoqi@0:     } else {
aoqi@0:       // caller will accept either sort; no need to adjust name
aoqi@0:     }
aoqi@0:     for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
aoqi@0:       Method* m = st.method();
aoqi@0:       Symbol* m_name = m->name();
aoqi@0:       if (m_name == clinit_name)
aoqi@0:         continue;
aoqi@0:       if (name != NULL && ((m_name != name) ^ negate_name_test))
aoqi@0:           continue;
aoqi@0:       if (sig != NULL && m->signature() != sig)
aoqi@0:         continue;
aoqi@0:       // passed the filters
aoqi@0:       if (rskip > 0) {
aoqi@0:         --rskip;
aoqi@0:       } else if (rfill < rlimit) {
aoqi@0:         Handle result(thread, results->obj_at(rfill++));
aoqi@0:         if (!java_lang_invoke_MemberName::is_instance(result()))
aoqi@0:           return -99;  // caller bug!
aoqi@0:         CallInfo info(m);
aoqi@0:         oop saved = MethodHandles::init_method_MemberName(result, info);
aoqi@0:         if (saved != result())
aoqi@0:           results->obj_at_put(rfill-1, saved);  // show saved instance to user
aoqi@0:       } else if (++overflow >= overflow_limit) {
aoqi@0:         match_flags = 0; break; // got tired of looking at overflow
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   // return number of elements we at leasted wanted to initialize
aoqi@0:   return rfill + overflow;
aoqi@0: }
aoqi@0: 
aoqi@0: //------------------------------------------------------------------------------
aoqi@0: // MemberNameTable
aoqi@0: //
aoqi@0: 
aoqi@0: MemberNameTable::MemberNameTable(int methods_cnt)
aoqi@0:                   : GrowableArray<jweak>(methods_cnt, true) {
aoqi@0:   assert_locked_or_safepoint(MemberNameTable_lock);
aoqi@0: }
aoqi@0: 
aoqi@0: MemberNameTable::~MemberNameTable() {
aoqi@0:   assert_locked_or_safepoint(MemberNameTable_lock);
aoqi@0:   int len = this->length();
aoqi@0: 
aoqi@0:   for (int idx = 0; idx < len; idx++) {
aoqi@0:     jweak ref = this->at(idx);
aoqi@0:     JNIHandles::destroy_weak_global(ref);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
aoqi@0:   assert_locked_or_safepoint(MemberNameTable_lock);
aoqi@0:   this->at_put_grow(index, mem_name_wref);
aoqi@0: }
aoqi@0: 
aoqi@0: // Return a member name oop or NULL.
aoqi@0: oop MemberNameTable::get_member_name(int index) {
aoqi@0:   assert_locked_or_safepoint(MemberNameTable_lock);
aoqi@0: 
aoqi@0:   jweak ref = this->at(index);
aoqi@0:   oop mem_name = JNIHandles::resolve(ref);
aoqi@0:   return mem_name;
aoqi@0: }
aoqi@0: 
aoqi@0: #if INCLUDE_JVMTI
aoqi@0: oop MemberNameTable::find_member_name_by_method(Method* old_method) {
aoqi@0:   assert_locked_or_safepoint(MemberNameTable_lock);
aoqi@0:   oop found = NULL;
aoqi@0:   int len = this->length();
aoqi@0: 
aoqi@0:   for (int idx = 0; idx < len; idx++) {
aoqi@0:     oop mem_name = JNIHandles::resolve(this->at(idx));
aoqi@0:     if (mem_name == NULL) {
aoqi@0:       continue;
aoqi@0:     }
aoqi@0:     Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
aoqi@0:     if (method == old_method) {
aoqi@0:       found = mem_name;
aoqi@0:       break;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return found;
aoqi@0: }
aoqi@0: 
aoqi@0: // It is called at safepoint only
aoqi@0: void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
aoqi@0:                                             int methods_length, bool *trace_name_printed) {
aoqi@0:   assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
aoqi@0:   // search the MemberNameTable for uses of either obsolete or EMCP methods
aoqi@0:   for (int j = 0; j < methods_length; j++) {
aoqi@0:     Method* old_method = old_methods[j];
aoqi@0:     Method* new_method = new_methods[j];
aoqi@0:     oop mem_name = find_member_name_by_method(old_method);
aoqi@0:     if (mem_name != NULL) {
aoqi@0:       java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
aoqi@0: 
aoqi@0:       if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
aoqi@0:         if (!(*trace_name_printed)) {
aoqi@0:           // RC_TRACE_MESG macro has an embedded ResourceMark
aoqi@0:           RC_TRACE_MESG(("adjust: name=%s",
aoqi@0:                          old_method->method_holder()->external_name()));
aoqi@0:           *trace_name_printed = true;
aoqi@0:         }
aoqi@0:         // RC_TRACE macro has an embedded ResourceMark
aoqi@0:         RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
aoqi@0:                               new_method->name()->as_C_string(),
aoqi@0:                               new_method->signature()->as_C_string()));
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: #endif // INCLUDE_JVMTI
aoqi@0: 
aoqi@0: //
aoqi@0: // Here are the native methods in java.lang.invoke.MethodHandleNatives
aoqi@0: // They are the private interface between this JVM and the HotSpot-specific
aoqi@0: // Java code that implements JSR 292 method handles.
aoqi@0: //
aoqi@0: // Note:  We use a JVM_ENTRY macro to define each of these, for this is the way
aoqi@0: // that intrinsic (non-JNI) native methods are defined in HotSpot.
aoqi@0: //
aoqi@0: 
aoqi@0: JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
aoqi@0:   switch (which) {
aoqi@0:   case MethodHandles::GC_COUNT_GWT:
aoqi@0: #ifdef COMPILER2
aoqi@0:     return true;
aoqi@0: #else
aoqi@0:     return false;
aoqi@0: #endif
aoqi@0:   }
aoqi@0:   return 0;
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: #ifndef PRODUCT
aoqi@0: #define EACH_NAMED_CON(template, requirement) \
aoqi@0:     template(MethodHandles,GC_COUNT_GWT) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_IS_METHOD) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_IS_FIELD) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_IS_TYPE) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
aoqi@0:     template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
aoqi@0:     template(MethodHandles,GC_LAMBDA_SUPPORT) \
aoqi@0:     /*end*/
aoqi@0: 
aoqi@0: #define IGNORE_REQ(req_expr) /* req_expr */
aoqi@0: #define ONE_PLUS(scope,value) 1+
aoqi@0: static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
aoqi@0: #define VALUE_COMMA(scope,value) scope::value,
aoqi@0: static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
aoqi@0: #define STRING_NULL(scope,value) #value "\0"
aoqi@0: static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
aoqi@0: 
aoqi@0: static bool advertise_con_value(int which) {
aoqi@0:   if (which < 0)  return false;
aoqi@0:   bool ok = true;
aoqi@0:   int count = 0;
aoqi@0: #define INC_COUNT(scope,value) \
aoqi@0:   ++count;
aoqi@0: #define CHECK_REQ(req_expr) \
aoqi@0:   if (which < count)  return ok; \
aoqi@0:   ok = (req_expr);
aoqi@0:   EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
aoqi@0: #undef INC_COUNT
aoqi@0: #undef CHECK_REQ
aoqi@0:   assert(count == con_value_count, "");
aoqi@0:   if (which < count)  return ok;
aoqi@0:   return false;
aoqi@0: }
aoqi@0: 
aoqi@0: #undef ONE_PLUS
aoqi@0: #undef VALUE_COMMA
aoqi@0: #undef STRING_NULL
aoqi@0: #undef EACH_NAMED_CON
aoqi@0: #endif // PRODUCT
aoqi@0: 
aoqi@0: JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
aoqi@0: #ifndef PRODUCT
aoqi@0:   if (advertise_con_value(which)) {
aoqi@0:     assert(which >= 0 && which < con_value_count, "");
aoqi@0:     int con = con_values[which];
aoqi@0:     objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
aoqi@0:     if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
aoqi@0:       const char* str = &con_names[0];
aoqi@0:       for (int i = 0; i < which; i++)
aoqi@0:         str += strlen(str) + 1;   // skip name and null
aoqi@0:       oop name = java_lang_String::create_oop_from_str(str, CHECK_0);  // possible safepoint
aoqi@0:       box->obj_at_put(0, name);
aoqi@0:     }
aoqi@0:     return con;
aoqi@0:   }
aoqi@0: #endif
aoqi@0:   return 0;
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: // void init(MemberName self, AccessibleObject ref)
aoqi@0: JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
aoqi@0:   if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
aoqi@0:   if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
aoqi@0:   Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
aoqi@0:   Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
aoqi@0:   MethodHandles::init_MemberName(mname, target);
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: // void expand(MemberName self)
aoqi@0: JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
aoqi@0:   if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
aoqi@0:   Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
aoqi@0:   MethodHandles::expand_MemberName(mname, 0, CHECK);
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: // void resolve(MemberName self, Class<?> caller)
aoqi@0: JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
aoqi@0:   if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
aoqi@0:   Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
aoqi@0: 
aoqi@0:   // The trusted Java code that calls this method should already have performed
aoqi@0:   // access checks on behalf of the given caller.  But, we can verify this.
aoqi@0:   if (VerifyMethodHandles && caller_jh != NULL &&
aoqi@0:       java_lang_invoke_MemberName::clazz(mname()) != NULL) {
aoqi@0:     Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
aoqi@0:     if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
aoqi@0:       reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Reflection::verify_class_access can only handle instance classes.
aoqi@0:     if (reference_klass != NULL && reference_klass->oop_is_instance()) {
aoqi@0:       // Emulate LinkResolver::check_klass_accessability.
aoqi@0:       Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
aoqi@0:       if (!Reflection::verify_class_access(caller,
aoqi@0:                                            reference_klass,
aoqi@0:                                            true)) {
aoqi@0:         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   KlassHandle caller(THREAD,
aoqi@0:                      caller_jh == NULL ? (Klass*) NULL :
aoqi@0:                      java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
aoqi@0:   Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
aoqi@0: 
aoqi@0:   if (resolved.is_null()) {
aoqi@0:     int flags = java_lang_invoke_MemberName::flags(mname());
aoqi@0:     int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
aoqi@0:     if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
aoqi@0:       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
aoqi@0:     }
aoqi@0:     if ((flags & ALL_KINDS) == IS_FIELD) {
aoqi@0:       THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
aoqi@0:     } else if ((flags & ALL_KINDS) == IS_METHOD ||
aoqi@0:                (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
aoqi@0:       THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
aoqi@0:     } else {
aoqi@0:       THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   return JNIHandles::make_local(THREAD, resolved());
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
aoqi@0:   if (mname == NULL ||
aoqi@0:       java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
aoqi@0:     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
aoqi@0:   } else {
aoqi@0:     int flags = java_lang_invoke_MemberName::flags(mname);
aoqi@0:     if ((flags & IS_FIELD) != 0 &&
aoqi@0:         (must_be_static
aoqi@0:          ? (flags & JVM_ACC_STATIC) != 0
aoqi@0:          : (flags & JVM_ACC_STATIC) == 0)) {
aoqi@0:       int vmindex = java_lang_invoke_MemberName::vmindex(mname);
aoqi@0:       return (jlong) vmindex;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   const char* msg = (must_be_static ? "static field required" : "non-static field required");
aoqi@0:   THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
aoqi@0:   return 0;
aoqi@0: }
aoqi@0: 
aoqi@0: JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
aoqi@0:   return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
aoqi@0:   return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
aoqi@0:   // use the other function to perform sanity checks:
aoqi@0:   jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
aoqi@0:   oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
aoqi@0:   return JNIHandles::make_local(THREAD, clazz);
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
aoqi@0:   if (mname_jh == NULL)  return NULL;
aoqi@0:   Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
aoqi@0:   intptr_t vmindex  = java_lang_invoke_MemberName::vmindex(mname());
aoqi@0:   Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
aoqi@0:   objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
aoqi@0:   jvalue vmindex_value; vmindex_value.j = (long)vmindex;
aoqi@0:   oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
aoqi@0:   result->obj_at_put(0, x);
aoqi@0:   x = NULL;
aoqi@0:   if (vmtarget == NULL) {
aoqi@0:     x = NULL;
aoqi@0:   } else if (vmtarget->is_klass()) {
aoqi@0:     x = ((Klass*) vmtarget)->java_mirror();
aoqi@0:   } else if (vmtarget->is_method()) {
aoqi@0:     x = mname();
aoqi@0:   }
aoqi@0:   result->obj_at_put(1, x);
aoqi@0:   return JNIHandles::make_local(env, result());
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: 
aoqi@0: 
aoqi@0: //  static native int getMembers(Class<?> defc, String matchName, String matchSig,
aoqi@0: //          int matchFlags, Class<?> caller, int skip, MemberName[] results);
aoqi@0: JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
aoqi@0:                                jclass clazz_jh, jstring name_jh, jstring sig_jh,
aoqi@0:                                int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
aoqi@0:   if (clazz_jh == NULL || results_jh == NULL)  return -1;
aoqi@0:   KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
aoqi@0: 
aoqi@0:   objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
aoqi@0:   if (results.is_null() || !results->is_objArray())  return -1;
aoqi@0: 
aoqi@0:   TempNewSymbol name = NULL;
aoqi@0:   TempNewSymbol sig = NULL;
aoqi@0:   if (name_jh != NULL) {
aoqi@0:     name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
aoqi@0:     if (name == NULL)  return 0; // a match is not possible
aoqi@0:   }
aoqi@0:   if (sig_jh != NULL) {
aoqi@0:     sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
aoqi@0:     if (sig == NULL)  return 0; // a match is not possible
aoqi@0:   }
aoqi@0: 
aoqi@0:   KlassHandle caller;
aoqi@0:   if (caller_jh != NULL) {
aoqi@0:     oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
aoqi@0:     if (!java_lang_Class::is_instance(caller_oop))  return -1;
aoqi@0:     caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (name != NULL && sig != NULL && results.not_null()) {
aoqi@0:     // try a direct resolve
aoqi@0:     // %%% TO DO
aoqi@0:   }
aoqi@0: 
aoqi@0:   int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
aoqi@0:                                             caller, skip, results);
aoqi@0:   // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
aoqi@0:   return res;
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
aoqi@0:   Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
aoqi@0:   Handle target   (THREAD, JNIHandles::resolve(target_jh));
aoqi@0:   {
aoqi@0:     // Walk all nmethods depending on this call site.
aoqi@0:     MutexLocker mu(Compile_lock, thread);
aoqi@0:     Universe::flush_dependents_on(call_site, target);
aoqi@0:     java_lang_invoke_CallSite::set_target(call_site(), target());
aoqi@0:   }
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
aoqi@0:   Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
aoqi@0:   Handle target   (THREAD, JNIHandles::resolve(target_jh));
aoqi@0:   {
aoqi@0:     // Walk all nmethods depending on this call site.
aoqi@0:     MutexLocker mu(Compile_lock, thread);
aoqi@0:     Universe::flush_dependents_on(call_site, target);
aoqi@0:     java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
aoqi@0:   }
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Throws a java/lang/UnsupportedOperationException unconditionally.
aoqi@0:  * This is required by the specification of MethodHandle.invoke if
aoqi@0:  * invoked directly.
aoqi@0:  */
aoqi@0: JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
aoqi@0:   THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Throws a java/lang/UnsupportedOperationException unconditionally.
aoqi@0:  * This is required by the specification of MethodHandle.invokeExact if
aoqi@0:  * invoked directly.
aoqi@0:  */
aoqi@0: JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
aoqi@0:   THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: JVM_END
aoqi@0: 
aoqi@0: /// JVM_RegisterMethodHandleMethods
aoqi@0: 
aoqi@0: #undef CS  // Solaris builds complain
aoqi@0: 
aoqi@0: #define LANG "Ljava/lang/"
aoqi@0: #define JLINV "Ljava/lang/invoke/"
aoqi@0: 
aoqi@0: #define OBJ   LANG"Object;"
aoqi@0: #define CLS   LANG"Class;"
aoqi@0: #define STRG  LANG"String;"
aoqi@0: #define CS    JLINV"CallSite;"
aoqi@0: #define MT    JLINV"MethodType;"
aoqi@0: #define MH    JLINV"MethodHandle;"
aoqi@0: #define MEM   JLINV"MemberName;"
aoqi@0: 
aoqi@0: #define CC (char*)  /*cast a literal from (const char*)*/
aoqi@0: #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
aoqi@0: 
aoqi@0: // These are the native methods on java.lang.invoke.MethodHandleNatives.
aoqi@0: static JNINativeMethod MHN_methods[] = {
aoqi@0:   {CC"init",                      CC"("MEM""OBJ")V",                     FN_PTR(MHN_init_Mem)},
aoqi@0:   {CC"expand",                    CC"("MEM")V",                          FN_PTR(MHN_expand_Mem)},
aoqi@0:   {CC"resolve",                   CC"("MEM""CLS")"MEM,                   FN_PTR(MHN_resolve_Mem)},
aoqi@0:   {CC"getConstant",               CC"(I)I",                              FN_PTR(MHN_getConstant)},
aoqi@0:   //  static native int getNamedCon(int which, Object[] name)
aoqi@0:   {CC"getNamedCon",               CC"(I["OBJ")I",                        FN_PTR(MHN_getNamedCon)},
aoqi@0:   //  static native int getMembers(Class<?> defc, String matchName, String matchSig,
aoqi@0:   //          int matchFlags, Class<?> caller, int skip, MemberName[] results);
aoqi@0:   {CC"getMembers",                CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
aoqi@0:   {CC"objectFieldOffset",         CC"("MEM")J",                          FN_PTR(MHN_objectFieldOffset)},
aoqi@0:   {CC"setCallSiteTargetNormal",   CC"("CS""MH")V",                       FN_PTR(MHN_setCallSiteTargetNormal)},
aoqi@0:   {CC"setCallSiteTargetVolatile", CC"("CS""MH")V",                       FN_PTR(MHN_setCallSiteTargetVolatile)},
aoqi@0:   {CC"staticFieldOffset",         CC"("MEM")J",                          FN_PTR(MHN_staticFieldOffset)},
aoqi@0:   {CC"staticFieldBase",           CC"("MEM")"OBJ,                        FN_PTR(MHN_staticFieldBase)},
aoqi@0:   {CC"getMemberVMInfo",           CC"("MEM")"OBJ,                        FN_PTR(MHN_getMemberVMInfo)}
aoqi@0: };
aoqi@0: 
aoqi@0: static JNINativeMethod MH_methods[] = {
aoqi@0:   // UnsupportedOperationException throwers
aoqi@0:   {CC"invoke",                    CC"(["OBJ")"OBJ,                       FN_PTR(MH_invoke_UOE)},
aoqi@0:   {CC"invokeExact",               CC"(["OBJ")"OBJ,                       FN_PTR(MH_invokeExact_UOE)}
aoqi@0: };
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Helper method to register native methods.
aoqi@0:  */
aoqi@0: static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
aoqi@0:   int status = env->RegisterNatives(clazz, methods, nMethods);
aoqi@0:   if (status != JNI_OK || env->ExceptionOccurred()) {
aoqi@0:     warning("JSR 292 method handle code is mismatched to this JVM.  Disabling support.");
aoqi@0:     env->ExceptionClear();
aoqi@0:     return false;
aoqi@0:   }
aoqi@0:   return true;
aoqi@0: }
aoqi@0: 
aoqi@0: /**
aoqi@0:  * This one function is exported, used by NativeLookup.
aoqi@0:  */
aoqi@0: JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
aoqi@0:   if (!EnableInvokeDynamic) {
aoqi@0:     warning("JSR 292 is disabled in this JVM.  Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
aoqi@0:     return;  // bind nothing
aoqi@0:   }
aoqi@0: 
aoqi@0:   assert(!MethodHandles::enabled(), "must not be enabled");
aoqi@0:   bool enable_MH = true;
aoqi@0: 
aoqi@0:   jclass MH_class = NULL;
aoqi@0:   if (SystemDictionary::MethodHandle_klass() == NULL) {
aoqi@0:     enable_MH = false;
aoqi@0:   } else {
aoqi@0:     oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
aoqi@0:     MH_class = (jclass) JNIHandles::make_local(env, mirror);
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (enable_MH) {
aoqi@0:     ThreadToNativeFromVM ttnfv(thread);
aoqi@0: 
aoqi@0:     if (enable_MH) {
aoqi@0:       enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
aoqi@0:     }
aoqi@0:     if (enable_MH) {
aoqi@0:       enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (TraceInvokeDynamic) {
aoqi@0:     tty->print_cr("MethodHandle support loaded (using LambdaForms)");
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (enable_MH) {
aoqi@0:     MethodHandles::generate_adapters();
aoqi@0:     MethodHandles::set_enabled(true);
aoqi@0:   }
aoqi@0: }
aoqi@0: JVM_END