truffle: src/share/vm/prims/methodHandles.cpp comparison

comparison src/share/vm/prims/methodHandles.cpp @ 710:e5b0439ef4ae

6655638: dynamic languages need method handles Summary: initial implementation, with known omissions (x86/64, sparc, compiler optim., c-oops, C++ interp.) Reviewed-by: kvn, twisti, never

author	jrose
date	Wed, 08 Apr 2009 10:56:49 -0700
parents
children	be93aad57795

comparison

equal deleted inserted replaced

-:1d037ecd7960
+:e5b0439ef4ae
+/*
+* Copyright 2008-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+/*
+* JSR 292 reference implementation: method handles
+*/
+#include "incls/_precompiled.incl"
+#include "incls/_methodHandles.cpp.incl"
+bool MethodHandles::_enabled = false; // set true after successful native linkage
+MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
+const char*        MethodHandles::_entry_names[_EK_LIMIT+1] = {
+"check_mtype",
+"wrong_method_type",          // what happens when there is a type mismatch
+"invokestatic",               // how a MH emulates invokestatic
+"invokespecial",              // ditto for the other invokes...
+"invokevirtual",
+"invokeinterface",
+"bound_ref",                  // these are for BMH...
+"bound_int",
+"bound_long",
+"bound_ref_direct",           // (direct versions have a direct methodOop)
+"bound_int_direct",
+"bound_long_direct",
+// starting at _adapter_mh_first:
+"adapter_retype_only",       // these are for AMH...
+"adapter_check_cast",
+"adapter_prim_to_prim",
+"adapter_ref_to_prim",
+"adapter_prim_to_ref",
+"adapter_swap_args",
+"adapter_rot_args",
+"adapter_dup_args",
+"adapter_drop_args",
+"adapter_collect_args",
+"adapter_spread_args",
+"adapter_flyby",
+"adapter_ricochet",
+// optimized adapter types:
+"adapter_swap_args/1",
+"adapter_swap_args/2",
+"adapter_rot_args/1,up",
+"adapter_rot_args/1,down",
+"adapter_rot_args/2,up",
+"adapter_rot_args/2,down",
+"adapter_prim_to_prim/i2i",
+"adapter_prim_to_prim/l2i",
+"adapter_prim_to_prim/d2f",
+"adapter_prim_to_prim/i2l",
+"adapter_prim_to_prim/f2d",
+"adapter_ref_to_prim/unboxi",
+"adapter_ref_to_prim/unboxl",
+"adapter_spread_args/0",
+"adapter_spread_args/1",
+"adapter_spread_args/more",
+NULL
+};
+#ifdef ASSERT
+bool MethodHandles::spot_check_entry_names() {
+assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
+assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
+assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
+assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), "");
+assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
+return true;
+}
+#endif
+void MethodHandles::set_enabled(bool z) {
+if (_enabled != z) {
+guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles");
+_enabled = z;
+}
+}
+// Note: A method which does not have a TRAPS argument cannot block in the GC
+// or throw exceptions.  Such methods are used in this file to do something quick
+// and local, like parse a data structure.  For speed, such methods work on plain
+// oops, not handles.  Trapping methods uniformly operate on handles.
+methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
+klassOop& receiver_limit_result, int& decode_flags_result) {
+if (vmtarget == NULL)  return NULL;
+assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
+if (vmindex < 0) {
+// this DMH performs no dispatch; it is directly bound to a methodOop
+// A MemberName may either be directly bound to a methodOop,
+// or it may use the klass/index form; both forms mean the same thing.
+methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
+if ((decode_flags_result & _dmf_has_receiver) != 0
+&& java_dyn_MethodType::is_instance(mtype)) {
+// Extract receiver type restriction from mtype.ptypes[0].
+objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype);
+oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
+if (java_lang_Class::is_instance(ptype0))
+receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
+}
+if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
+// this DMH can be an "invokespecial" version
+decode_flags_result &= ~_dmf_does_dispatch;
+} else {
+assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
+}
+return m;
+} else {
+decode_flags_result |= MethodHandles::_dmf_does_dispatch;
+assert(vmtarget->is_klass(), "must be class or interface");
+receiver_limit_result = (klassOop)vmtarget;
+Klass* tk = Klass::cast((klassOop)vmtarget);
+if (tk->is_interface()) {
+// an itable linkage is <interface, itable index>
+decode_flags_result |= MethodHandles::_dmf_from_interface;
+return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
+} else {
+if (!tk->oop_is_instance())
+tk = instanceKlass::cast(SystemDictionary::object_klass());
+return ((instanceKlass*)tk)->method_at_vtable(vmindex);
+}
+}
+}
+// MemberName and DirectMethodHandle have the same linkage to the JVM internals.
+// (MemberName is the non-operational name used for queries and setup.)
+methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh);
+int vmindex  = sun_dyn_DirectMethodHandle::vmindex(mh);
+oop mtype    = sun_dyn_DirectMethodHandle::type(mh);
+return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
+}
+methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+assert(mh->klass() == SystemDictionary::BoundMethodHandle_klass(), "");
+for (oop bmh = mh;;) {
+// Bound MHs can be stacked to bind several arguments.
+oop target = java_dyn_MethodHandle::vmtarget(bmh);
+if (target == NULL)  return NULL;
+decode_flags_result |= MethodHandles::_dmf_binds_argument;
+klassOop tk = target->klass();
+if (tk == SystemDictionary::BoundMethodHandle_klass()) {
+bmh = target;
+continue;
+} else {
+if (java_dyn_MethodHandle::is_subclass(tk)) {
+//assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
+return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
+} else {
+// Optimized case:  binding a receiver to a non-dispatched DMH
+// short-circuits directly to the methodOop.
+assert(target->is_method(), "must be a simple method");
+methodOop m = (methodOop) target;
+DEBUG_ONLY(int argslot = sun_dyn_BoundMethodHandle::vmargslot(bmh));
+assert(argslot == m->size_of_parameters() - 1, "must be initial argument (receiver)");
+decode_flags_result |= MethodHandles::_dmf_binds_method;
+return m;
+}
+}
+}
+}
+methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
+for (oop amh = mh;;) {
+// Adapter MHs can be stacked to convert several arguments.
+int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh));
+decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
+oop target = java_dyn_MethodHandle::vmtarget(amh);
+if (target == NULL)  return NULL;
+klassOop tk = target->klass();
+if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
+amh = target;
+continue;
+} else {
+// must be a BMH (which will bind some more arguments) or a DMH (for the final call)
+return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
+}
+}
+}
+methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+if (mh == NULL)  return NULL;
+klassOop mhk = mh->klass();
+assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
+if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
+return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
+} else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
+return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
+} else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
+return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
+} else {
+assert(false, "cannot parse this MH");
+return NULL;              // random MH?
+}
+}
+methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
+assert(m->is_method(), "");
+if (m->is_static()) {
+// check that signature begins '(L' or '([' (not '(I', '()', etc.)
+symbolOop sig = m->signature();
+BasicType recv_bt = char2type(sig->byte_at(1));
+// Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
+assert(sig->byte_at(0) == '(', "must be method sig");
+if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
+decode_flags_result |= _dmf_has_receiver;
+} else {
+// non-static method
+decode_flags_result |= _dmf_has_receiver;
+if (!m->can_be_statically_bound() && !m->is_initializer()) {
+decode_flags_result |= _dmf_does_dispatch;
+if (Klass::cast(m->method_holder())->is_interface())
+decode_flags_result |= _dmf_from_interface;
+}
+}
+return m;
+}
+// A trusted party is handing us a cookie to determine a method.
+// Let's boil it down to the method oop they really want.
+methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) {
+decode_flags_result = 0;
+receiver_limit_result = NULL;
+klassOop xk = x->klass();
+if (xk == Universe::methodKlassObj()) {
+return decode_methodOop((methodOop) x, decode_flags_result);
+} else if (xk == SystemDictionary::MemberName_klass()) {
+// Note: This only works if the MemberName has already been resolved.
+return decode_MemberName(x, receiver_limit_result, decode_flags_result);
+} else if (java_dyn_MethodHandle::is_subclass(xk)) {
+return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
+} else if (xk == SystemDictionary::reflect_method_klass()) {
+oop clazz  = java_lang_reflect_Method::clazz(x);
+int slot   = java_lang_reflect_Method::slot(x);
+klassOop k = java_lang_Class::as_klassOop(clazz);
+if (k != NULL && Klass::cast(k)->oop_is_instance())
+return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
+decode_flags_result);
+} else if (xk == SystemDictionary::reflect_constructor_klass()) {
+oop clazz  = java_lang_reflect_Constructor::clazz(x);
+int slot   = java_lang_reflect_Constructor::slot(x);
+klassOop k = java_lang_Class::as_klassOop(clazz);
+if (k != NULL && Klass::cast(k)->oop_is_instance())
+return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
+decode_flags_result);
+} else {
+// unrecognized object
+assert(!x->is_method(), "already checked");
+assert(!sun_dyn_MemberName::is_instance(x), "already checked");
+}
+return NULL;
+}
+int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
+if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
+return 0;                   // no push/pop
+int this_vmslots = java_dyn_MethodHandle::vmslots(mh);
+int last_vmslots = 0;
+oop last_mh = mh;
+for (;;) {
+oop target = java_dyn_MethodHandle::vmtarget(last_mh);
+if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
+last_vmslots = java_dyn_MethodHandle::vmslots(target);
+break;
+} else if (!java_dyn_MethodHandle::is_instance(target)) {
+// might be klass or method
+assert(target->is_method(), "must get here with a direct ref to method");
+last_vmslots = methodOop(target)->size_of_parameters();
+break;
+}
+last_mh = target;
+}
+// If I am called with fewer VM slots than my ultimate callee,
+// it must be that I push the additionally needed slots.
+// Likewise if am called with more VM slots, I will pop them.
+return (last_vmslots - this_vmslots);
+}
+// MemberName support
+// import sun_dyn_MemberName.*
+enum {
+IS_METHOD      = sun_dyn_MemberName::MN_IS_METHOD,
+IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR,
+IS_FIELD       = sun_dyn_MemberName::MN_IS_FIELD,
+IS_TYPE        = sun_dyn_MemberName::MN_IS_TYPE,
+SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES,
+SEARCH_INTERFACES   = sun_dyn_MemberName::MN_SEARCH_INTERFACES,
+ALL_KINDS      = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
+VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED
+};
+void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
+if (target_oop->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()
+int mods  = java_lang_reflect_Field::modifiers(target_oop);
+klassOop k = java_lang_Class::as_klassOop(clazz);
+int offset = instanceKlass::cast(k)->offset_from_fields(slot);
+init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
+} else {
+int decode_flags = 0; klassOop receiver_limit = NULL;
+methodOop m = MethodHandles::decode_method(target_oop,
+receiver_limit, decode_flags);
+bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
+init_MemberName(mname_oop, m, do_dispatch);
+}
+}
+void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
+int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
+| (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
+oop vmtarget = m;
+int vmindex  = methodOopDesc::invalid_vtable_index;  // implies no info yet
+if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
+vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
+assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
+sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
+sun_dyn_MemberName::set_vmindex(mname_oop,  vmindex);
+sun_dyn_MemberName::set_flags(mname_oop,    flags);
+}
+void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
+int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
+oop vmtarget = field_holder;
+int vmindex  = offset;  // implies no info yet
+assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
+sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
+sun_dyn_MemberName::set_vmindex(mname_oop,  vmindex);
+sun_dyn_MemberName::set_flags(mname_oop,    flags);
+}
+methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) {
+int flags  = sun_dyn_MemberName::flags(mname);
+if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0)  return NULL;  // not invocable
+oop vmtarget = sun_dyn_MemberName::vmtarget(mname);
+int vmindex  = sun_dyn_MemberName::vmindex(mname);
+if (vmindex == VM_INDEX_UNINITIALIZED)  return NULL; // not resolved
+return decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
+}
+// An unresolved member name is a mere symbolic reference.
+// Resolving it plants a vmtarget/vmindex in it,
+// which refers dirctly to JVM internals.
+void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
+assert(sun_dyn_MemberName::is_instance(mname()), "");
+#ifdef ASSERT
+// If this assert throws, renegotiate the sentinel value used by the Java code,
+// so that it is distinct from any valid vtable index value, and any special
+// values defined in methodOopDesc::VtableIndexFlag.
+// The point of the slop is to give the Java code and the JVM some room
+// to independently specify sentinel values.
+const int sentinel_slop  = 10;
+const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
+assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
+#endif
+if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
+return;  // already resolved
+oop defc_oop = sun_dyn_MemberName::clazz(mname());
+oop name_str = sun_dyn_MemberName::name(mname());
+oop type_str = sun_dyn_MemberName::type(mname());
+int flags    = sun_dyn_MemberName::flags(mname());
+if (defc_oop == NULL || name_str == NULL || type_str == NULL) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
+}
+klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop);
+defc_oop = NULL;  // safety
+if (defc_klassOop == NULL)  return;  // a primitive; no resolution possible
+if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
+if (!Klass::cast(defc_klassOop)->oop_is_array())  return;
+defc_klassOop = SystemDictionary::object_klass();
+}
+instanceKlassHandle defc(THREAD, defc_klassOop);
+defc_klassOop = NULL;  // safety
+if (defc.is_null()) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
+}
+defc->link_class(CHECK);
+// convert the external string name to an internal symbol
+symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str));
+if (name.is_null())  return;  // no such name
+name_str = NULL;  // safety
+// convert the external string or reflective type to an internal signature
+bool force_signature = (name() == vmSymbols::invoke_name());
+symbolHandle type; {
+symbolOop type_sym = NULL;
+if (java_dyn_MethodType::is_instance(type_str)) {
+type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK);
+} else if (java_lang_Class::is_instance(type_str)) {
+type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK);
+} else if (java_lang_String::is_instance(type_str)) {
+if (force_signature) {
+type     = java_lang_String::as_symbol(type_str, CHECK);
+} else {
+type_sym = java_lang_String::as_symbol_or_null(type_str);
+}
+} else {
+THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type");
+}
+if (type_sym != NULL)
+type = symbolHandle(THREAD, type_sym);
+}
+if (type.is_null())  return;  // no such signature exists in the VM
+type_str = NULL; // safety
+// Time to do the lookup.
+switch (flags & ALL_KINDS) {
+case IS_METHOD:
+{
+CallInfo result;
+{
+EXCEPTION_MARK;
+if ((flags & JVM_ACC_STATIC) != 0) {
+LinkResolver::resolve_static_call(result,
+defc, name, type, KlassHandle(), false, false, THREAD);
+} else if (defc->is_interface()) {
+LinkResolver::resolve_interface_call(result, Handle(), defc,
+defc, name, type, KlassHandle(), false, false, THREAD);
+} else {
+LinkResolver::resolve_virtual_call(result, Handle(), defc,
+defc, name, type, KlassHandle(), false, false, THREAD);
+}
+if (HAS_PENDING_EXCEPTION) {
+CLEAR_PENDING_EXCEPTION;
+return;
+}
+}
+methodHandle m = result.resolved_method();
+oop vmtarget = NULL;
+int vmindex = methodOopDesc::nonvirtual_vtable_index;
+if (defc->is_interface()) {
+vmindex = klassItable::compute_itable_index(m());
+assert(vmindex >= 0, "");
+} else if (result.has_vtable_index()) {
+vmindex = result.vtable_index();
+assert(vmindex >= 0, "");
+}
+assert(vmindex != VM_INDEX_UNINITIALIZED, "");
+if (vmindex < 0) {
+assert(result.is_statically_bound(), "");
+vmtarget = m();
+} else {
+vmtarget = result.resolved_klass()->as_klassOop();
+}
+int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
+sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
+sun_dyn_MemberName::set_vmindex(mname(),  vmindex);
+sun_dyn_MemberName::set_modifiers(mname(), mods);
+DEBUG_ONLY(int junk; klassOop junk2);
+assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
+"properly stored for later decoding");
+return;
+}
+case IS_CONSTRUCTOR:
+{
+CallInfo result;
+{
+EXCEPTION_MARK;
+if (name() == vmSymbols::object_initializer_name()) {
+LinkResolver::resolve_special_call(result,
+defc, name, type, KlassHandle(), false, THREAD);
+} else {
+break;                // will throw after end of switch
+}
+if (HAS_PENDING_EXCEPTION) {
+CLEAR_PENDING_EXCEPTION;
+return;
+}
+}
+assert(result.is_statically_bound(), "");
+methodHandle m = result.resolved_method();
+oop vmtarget = m();
+int vmindex  = methodOopDesc::nonvirtual_vtable_index;
+int mods     = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
+sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
+sun_dyn_MemberName::set_vmindex(mname(),  vmindex);
+sun_dyn_MemberName::set_modifiers(mname(), mods);
+DEBUG_ONLY(int junk; klassOop junk2);
+assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
+"properly stored for later decoding");
+return;
+}
+case IS_FIELD:
+{
+// This is taken from LinkResolver::resolve_field, sans access checks.
+fieldDescriptor fd; // find_field initializes fd if found
+KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd));
+// check if field exists; i.e., if a klass containing the field def has been selected
+if (sel_klass.is_null())  return;
+oop vmtarget = sel_klass->as_klassOop();
+int vmindex  = fd.offset();
+int mods     = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
+if (vmindex == VM_INDEX_UNINITIALIZED)  break;  // should not happen
+sun_dyn_MemberName::set_vmtarget(mname(),  vmtarget);
+sun_dyn_MemberName::set_vmindex(mname(),   vmindex);
+sun_dyn_MemberName::set_modifiers(mname(), mods);
+return;
+}
+}
+THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
+}
+// 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(sun_dyn_MemberName::is_instance(mname()), "");
+oop vmtarget = sun_dyn_MemberName::vmtarget(mname());
+int vmindex  = sun_dyn_MemberName::vmindex(mname());
+if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
+}
+bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL);
+bool have_name = (sun_dyn_MemberName::name(mname()) != NULL);
+bool have_type = (sun_dyn_MemberName::type(mname()) != NULL);
+int flags      = sun_dyn_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:
+{
+klassOop receiver_limit = NULL;
+int      decode_flags   = 0;
+methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL,
+receiver_limit, decode_flags));
+if (m.is_null())  break;
+if (!have_defc) {
+klassOop defc = m->method_holder();
+if (receiver_limit != NULL && receiver_limit != defc
+&& Klass::cast(receiver_limit)->is_subtype_of(defc))
+defc = receiver_limit;
+sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
+}
+if (!have_name) {
+//not java_lang_String::create_from_symbol; let's intern member names
+Handle name = StringTable::intern(m->name(), CHECK);
+sun_dyn_MemberName::set_name(mname(), name());
+}
+if (!have_type) {
+Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
+sun_dyn_MemberName::set_type(mname(), type());
+}
+return;
+}
+case IS_FIELD:
+{
+// This is taken from LinkResolver::resolve_field, sans access checks.
+if (!vmtarget->is_klass())  break;
+if (!Klass::cast((klassOop) vmtarget)->oop_is_instance())  break;
+instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
+bool is_static = ((flags & JVM_ACC_STATIC) != 0);
+fieldDescriptor fd; // find_field initializes fd if found
+if (!defc->find_field_from_offset(vmindex, is_static, &fd))
+break;                  // cannot expand
+if (!have_defc) {
+sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror());
+}
+if (!have_name) {
+//not java_lang_String::create_from_symbol; let's intern member names
+Handle name = StringTable::intern(fd.name(), CHECK);
+sun_dyn_MemberName::set_name(mname(), name());
+}
+if (!have_type) {
+Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
+sun_dyn_MemberName::set_type(mname(), type());
+}
+return;
+}
+}
+THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
+}
+int MethodHandles::find_MemberNames(klassOop k,
+symbolOop name, symbolOop sig,
+int mflags, klassOop caller,
+int skip, objArrayOop results) {
+DEBUG_ONLY(No_Safepoint_Verifier nsv);
+// this code contains no safepoints!
+// %%% take caller into account!
+if (k == NULL || !Klass::cast(k)->oop_is_instance())  return -1;
+int rfill = 0, rlimit = results->length(), rskip = skip;
+// overflow measurement:
+int overflow = 0, overflow_limit = MAX2(1000, rlimit);
+int match_flags = mflags;
+bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
+bool search_intfc  = ((match_flags & SEARCH_INTERFACES)   != 0);
+bool local_only = !(search_superc | search_intfc);
+bool classes_only = false;
+if (name != NULL) {
+if (name->utf8_length() == 0)  return 0; // a match is not possible
+}
+if (sig != NULL) {
+if (sig->utf8_length() == 0)  return 0; // a match is not possible
+if (sig->byte_at(0) == '(')
+match_flags &= ~(IS_FIELD | IS_TYPE);
+else
+match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
+}
+if ((match_flags & IS_TYPE) != 0) {
+// NYI, and Core Reflection works quite well for this query
+}
+if ((match_flags & IS_FIELD) != 0) {
+for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
+if (name != NULL && st.name() != name)
+continue;
+if (sig != NULL && st.signature() != sig)
+continue;
+// passed the filters
+if (rskip > 0) {
+--rskip;
+} else if (rfill < rlimit) {
+oop result = results->obj_at(rfill++);
+if (!sun_dyn_MemberName::is_instance(result))
+return -99;  // caller bug!
+MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
+} 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:
+symbolOop init_name   = vmSymbols::object_initializer_name();
+symbolOop clinit_name = vmSymbols::class_initializer_name();
+if (name == clinit_name)  clinit_name = NULL; // hack for exposing <clinit>
+bool negate_name_test = false;
+// fix name so that it captures the intention of IS_CONSTRUCTOR
+if (!(match_flags & IS_METHOD)) {
+// constructors only
+if (name == NULL) {
+name = init_name;
+} else if (name != init_name) {
+return 0;               // no constructors of this method name
+}
+} else if (!(match_flags & IS_CONSTRUCTOR)) {
+// methods only
+if (name == NULL) {
+name = init_name;
+negate_name_test = true; // if we see the name, we *omit* the entry
+} else if (name == init_name) {
+return 0;               // no methods of this constructor name
+}
+} else {
+// caller will accept either sort; no need to adjust name
+}
+for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
+methodOop m = st.method();
+symbolOop 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) {
+oop result = results->obj_at(rfill++);
+if (!sun_dyn_MemberName::is_instance(result))
+return -99;  // caller bug!
+MethodHandles::init_MemberName(result, m, true);
+} 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;
+}
+// Decode the vmtarget field of a method handle.
+// Sanitize out methodOops, klassOops, and any other non-Java data.
+// This is for debugging and reflection.
+oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
+assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH");
+if (format == ETF_HANDLE_OR_METHOD_NAME) {
+oop target = java_dyn_MethodHandle::vmtarget(mh());
+if (target == NULL) {
+return NULL;                // unformed MH
+}
+klassOop tklass = target->klass();
+if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::object_klass())) {
+return target;              // target is another MH (or something else?)
+}
+}
+if (format == ETF_DIRECT_HANDLE) {
+oop target = mh();
+for (;;) {
+if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
+return target;
+}
+if (!java_dyn_MethodHandle::is_instance(target)){
+return NULL;                // unformed MH
+}
+target = java_dyn_MethodHandle::vmtarget(target);
+}
+}
+// cases of metadata in MH.vmtarget:
+// - AMH can have methodOop for static invoke with bound receiver
+// - DMH can have methodOop for static invoke (on variable receiver)
+// - DMH can have klassOop for dispatched (non-static) invoke
+klassOop receiver_limit = NULL;
+int decode_flags = 0;
+methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
+if (m == NULL)  return NULL;
+switch (format) {
+case ETF_REFLECT_METHOD:
+// same as jni_ToReflectedMethod:
+if (m->is_initializer()) {
+return Reflection::new_constructor(m, THREAD);
+} else {
+return Reflection::new_method(m, UseNewReflection, false, THREAD);
+}
+case ETF_HANDLE_OR_METHOD_NAME:   // method, not handle
+case ETF_METHOD_NAME:
+{
+if (SystemDictionary::MemberName_klass() == NULL)  break;
+instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
+mname_klass->initialize(CHECK_NULL);
+Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL);
+sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
+bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
+init_MemberName(mname(), m, do_dispatch);
+expand_MemberName(mname, 0, CHECK_NULL);
+return mname();
+}
+}
+// Unknown format code.
+char msg[50];
+jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
+THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
+}
+bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
+if (src == dst || dst == SystemDictionary::object_klass())
+return false;                               // quickest checks
+Klass* srck = Klass::cast(src);
+Klass* dstk = Klass::cast(dst);
+if (dstk->is_interface()) {
+// interface receivers can safely be viewed as untyped,
+// because interface calls always include a dynamic check
+//dstk = Klass::cast(SystemDictionary::object_klass());
+return false;
+}
+if (srck->is_interface()) {
+// interface arguments must be viewed as untyped
+//srck = Klass::cast(SystemDictionary::object_klass());
+return true;
+}
+return !srck->is_subclass_of(dstk->as_klassOop());
+}
+static oop object_java_mirror() {
+return Klass::cast(SystemDictionary::object_klass())->java_mirror();
+}
+bool MethodHandles::same_basic_type_for_arguments(BasicType src,
+BasicType dst,
+bool for_return) {
+// return values can always be forgotten:
+if (for_return && dst == T_VOID)  return true;
+assert(src != T_VOID && dst != T_VOID, "should not be here");
+if (src == dst)  return true;
+if (type2size[src] != type2size[dst])  return false;
+// allow reinterpretation casts for integral widening
+if (is_subword_type(src)) { // subwords can fit in int or other subwords
+if (dst == T_INT)         // any subword fits in an int
+return true;
+if (src == T_BOOLEAN)     // boolean fits in any subword
+return is_subword_type(dst);
+if (src == T_BYTE && dst == T_SHORT)
+return true;            // remaining case: byte fits in short
+}
+// allow float/fixed reinterpretation casts
+if (src == T_FLOAT)   return dst == T_INT;
+if (src == T_INT)     return dst == T_FLOAT;
+if (src == T_DOUBLE)  return dst == T_LONG;
+if (src == T_LONG)    return dst == T_DOUBLE;
+return false;
+}
+const char* MethodHandles::check_method_receiver(methodOop m,
+klassOop passed_recv_type) {
+assert(!m->is_static(), "caller resp.");
+if (passed_recv_type == NULL)
+return "receiver type is primitive";
+if (class_cast_needed(passed_recv_type, m->method_holder())) {
+Klass* formal = Klass::cast(m->method_holder());
+return SharedRuntime::generate_class_cast_message("receiver type",
+formal->external_name());
+}
+return NULL;                  // checks passed
+}
+// Verify that m's signature can be called type-safely by a method handle
+// of the given method type 'mtype'.
+// It takes a TRAPS argument because it must perform symbol lookups.
+void MethodHandles::verify_method_signature(methodHandle m,
+Handle mtype,
+int first_ptype_pos,
+KlassHandle insert_ptype,
+TRAPS) {
+objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype()));
+int pnum = first_ptype_pos;
+int pmax = ptypes->length();
+int mnum = 0;                 // method argument
+const char* err = NULL;
+for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
+oop ptype_oop = NULL;
+if (ss.at_return_type()) {
+if (pnum != pmax)
+{ err = "too many arguments"; break; }
+ptype_oop = java_dyn_MethodType::rtype(mtype());
+} else {
+if (pnum >= pmax)
+{ err = "not enough arguments"; break; }
+if (pnum >= 0)
+ptype_oop = ptypes->obj_at(pnum);
+else if (insert_ptype.is_null())
+ptype_oop = NULL;
+else
+ptype_oop = insert_ptype->java_mirror();
+pnum += 1;
+mnum += 1;
+}
+klassOop  mklass = NULL;
+BasicType mtype  = ss.type();
+if (mtype == T_ARRAY)  mtype = T_OBJECT; // fold all refs to T_OBJECT
+if (mtype == T_OBJECT) {
+if (ptype_oop == NULL) {
+// null matches any reference
+continue;
+}
+// If we fail to resolve types at this point, we will throw an error.
+symbolOop    name_oop = ss.as_symbol(CHECK);
+symbolHandle name(THREAD, name_oop);
+instanceKlass* mk = instanceKlass::cast(m->method_holder());
+Handle loader(THREAD, mk->class_loader());
+Handle domain(THREAD, mk->protection_domain());
+mklass = SystemDictionary::resolve_or_fail(name, loader, domain,
+true, CHECK);
+}
+if (ptype_oop == NULL) {
+// null does not match any non-reference; use Object to report the error
+ptype_oop = object_java_mirror();
+}
+klassOop  pklass = NULL;
+BasicType ptype  = java_lang_Class::as_BasicType(ptype_oop, &pklass);
+if (!ss.at_return_type()) {
+err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum);
+} else {
+err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal!
+}
+if (err != NULL)  break;
+}
+if (err != NULL) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), err);
+}
+}
+// Main routine for verifying the MethodHandle.type of a proposed
+// direct or bound-direct method handle.
+void MethodHandles::verify_method_type(methodHandle m,
+Handle mtype,
+bool has_bound_recv,
+KlassHandle bound_recv_type,
+TRAPS) {
+bool m_needs_receiver = !m->is_static();
+const char* err = NULL;
+int first_ptype_pos = m_needs_receiver ? 1 : 0;
+if (has_bound_recv && err == NULL) {
+first_ptype_pos -= 1;
+if (m_needs_receiver && bound_recv_type.is_null())
+{ err = "bound receiver is not an object"; goto die; }
+}
+if (m_needs_receiver && err == NULL) {
+objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype());
+if (ptypes->length() < first_ptype_pos)
+{ err = "receiver argument is missing"; goto die; }
+if (first_ptype_pos == -1)
+err = check_method_receiver(m(), bound_recv_type->as_klassOop());
+else
+err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(0)));
+if (err != NULL)  goto die;
+}
+// Check the other arguments for mistypes.
+verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
+return;
+die:
+THROW_MSG(vmSymbols::java_lang_InternalError(), err);
+}
+void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
+// Verify vmslots.
+int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh()));
+if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
+}
+}
+void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
+// Verify that argslot points at the given argnum.
+int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum);
+if (argslot != check_slot || argslot < 0) {
+const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
+size_t msglen = strlen(fmt) + 3*11 + 1;
+char* msg = NEW_RESOURCE_ARRAY(char, msglen);
+jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
+THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
+}
+}
+// Verify the correspondence between two method types.
+// Apart from the advertised changes, caller method type X must
+// be able to invoke the callee method Y type with no violations
+// of type integrity.
+// Return NULL if all is well, else a short error message.
+const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
+int insert_argnum, oop insert_type,
+int change_argnum, oop change_type,
+int delete_argnum,
+oop dst_mtype, int dst_beg, int dst_end) {
+objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype);
+objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype);
+int src_max = src_ptypes->length();
+int dst_max = dst_ptypes->length();
+if (src_end == -1)  src_end = src_max;
+if (dst_end == -1)  dst_end = dst_max;
+assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
+assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
+// pending actions; set to -1 when done:
+int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
+const char* err = NULL;
+// Walk along each array of parameter types, including a virtual
+// NULL end marker at the end of each.
+for (int src_idx = src_beg, dst_idx = dst_beg;
+(src_idx <= src_end && dst_idx <= dst_end);
+src_idx++, dst_idx++) {
+oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
+oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
+bool fix_null_src_type = false;
+// Perform requested edits.
+if (ins_idx == src_idx) {
+// note that the inserted guy is never affected by a change or deletion
+ins_idx = -1;
+src_type = insert_type;
+fix_null_src_type = true;
+--src_idx;                // back up to process src type on next loop
+src_idx = src_end;
+} else {
+// note that the changed guy can be immediately deleted
+if (chg_idx == src_idx) {
+chg_idx = -1;
+assert(src_idx < src_end, "oob");
+src_type = change_type;
+fix_null_src_type = true;
+}
+if (del_idx == src_idx) {
+del_idx = -1;
+assert(src_idx < src_end, "oob");
+--dst_idx;
+continue;               // rerun loop after skipping this position
+}
+}
+if (src_type == NULL && fix_null_src_type)
+// explicit null in this case matches any dest reference
+src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
+// Compare the two argument types.
+if (src_type != dst_type) {
+if (src_type == NULL)  return "not enough arguments";
+if (dst_type == NULL)  return "too many arguments";
+err = check_argument_type_change(src_type, dst_type, dst_idx);
+if (err != NULL)  return err;
+}
+}
+// Now compare return types also.
+oop src_rtype = java_dyn_MethodType::rtype(src_mtype);
+oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype);
+if (src_rtype != dst_rtype) {
+err = check_return_type_change(dst_rtype, src_rtype); // note reversal!
+if (err != NULL)  return err;
+}
+assert(err == NULL, "");
+return NULL;  // all is well
+}
+const char* MethodHandles::check_argument_type_change(BasicType src_type,
+klassOop src_klass,
+BasicType dst_type,
+klassOop dst_klass,
+int argnum) {
+const char* err = NULL;
+// just in case:
+if (src_type == T_ARRAY)  src_type = T_OBJECT;
+if (dst_type == T_ARRAY)  dst_type = T_OBJECT;
+// Produce some nice messages if VerifyMethodHandles is turned on:
+if (!same_basic_type_for_arguments(src_type, dst_type, (argnum < 0))) {
+if (src_type == T_OBJECT) {
+err = ((argnum >= 0)
+? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
+: "type mismatch: returning a %s, but caller expects primitive %s");
+} else if (dst_type == T_OBJECT) {
+err = ((argnum < 0)
+? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
+: "type mismatch: returning a primitive %s, but caller expects %s");
+} else {
+err = ((argnum < 0)
+? "type mismatch: passing a %s for method argument #%d, which expects %s"
+: "type mismatch: returning a %s, but caller expects %s");
+}
+} else if (src_type == T_OBJECT && class_cast_needed(src_klass, dst_klass)) {
+if (!class_cast_needed(dst_klass, src_klass)) {
+err = ((argnum < 0)
+? "cast required: passing a %s for method argument #%d, which expects %s"
+: "cast required: returning a %s, but caller expects %s");
+} else {
+err = ((argnum < 0)
+? "reference mismatch: passing a %s for method argument #%d, which expects %s"
+: "reference mismatch: returning a %s, but caller expects %s");
+}
+} else {
+// passed the obstacle course
+return NULL;
+}
+// format, format, format
+const char* src_name = type2name(src_type);
+const char* dst_name = type2name(dst_type);
+if (src_type == T_OBJECT)  src_name = Klass::cast(src_klass)->external_name();
+if (dst_type == T_OBJECT)  dst_name = Klass::cast(dst_klass)->external_name();
+if (src_name == NULL)  src_name = "unknown type";
+if (dst_name == NULL)  dst_name = "unknown type";
+size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
+char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
+if (argnum >= 0) {
+assert(strstr(err, "%d") != NULL, "");
+jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
+} else {
+assert(strstr(err, "%d") == NULL, "");
+jio_snprintf(msg, msglen, err, src_name,         dst_name);
+}
+return msg;
+}
+// Compute the depth within the stack of the given argument, i.e.,
+// the combined size of arguments to the right of the given argument.
+// For the last argument (ptypes.length-1) this will be zero.
+// For the first argument (0) this will be the size of all
+// arguments but that one.  For the special number -1, this
+// will be the size of all arguments, including the first.
+// If the argument is neither -1 nor a valid argument index,
+// then return a negative number.  Otherwise, the result
+// is in the range [0..vmslots] inclusive.
+int MethodHandles::argument_slot(oop method_type, int arg) {
+objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
+int argslot = 0;
+int len = ptypes->length();
+if (arg < -1 || arg >= len)  return -99;
+for (int i = len-1; i > arg; i--) {
+BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
+argslot += type2size[bt];
+}
+assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
+return argslot;
+}
+// Given a slot number, return the argument number.
+int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
+objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
+int argslot = 0;
+int len = ptypes->length();
+for (int i = len-1; i >= 0; i--) {
+if (query_argslot == argslot)  return i;
+BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
+argslot += type2size[bt];
+}
+// return pseudo-arg deepest in stack:
+if (query_argslot == argslot)  return -1;
+return -99;                   // oob slot, or splitting a double-slot arg
+}
+methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
+KlassHandle receiver_limit,
+int decode_flags,
+KlassHandle receiver_klass,
+TRAPS) {
+assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
+assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
+if (!m->is_static() &&
+(receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
+// given type does not match class of method, or receiver is null!
+// caller should have checked this, but let's be extra careful...
+return methodHandle();
+if (receiver_limit.not_null() &&
+(receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
+// given type is not limited to the receiver type
+// note that a null receiver can match any reference value, for a static method
+return methodHandle();
+if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
+// pre-dispatched or static method (null receiver is OK for static)
+return m;
+} else if (receiver_klass.is_null()) {
+// null receiver value; cannot dispatch
+return methodHandle();
+} else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
+// perform virtual dispatch
+int vtable_index = m->vtable_index();
+guarantee(vtable_index >= 0, "valid vtable index");
+// receiver_klass might be an arrayKlassOop but all vtables start at
+// the same place. The cast is to avoid virtual call and assertion.
+// See also LinkResolver::runtime_resolve_virtual_method.
+instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
+DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
+methodOop m_oop = inst->method_at_vtable(vtable_index);
+return methodHandle(THREAD, m_oop);
+} else {
+// perform interface dispatch
+int itable_index = klassItable::compute_itable_index(m());
+guarantee(itable_index >= 0, "valid itable index");
+instanceKlass* inst = instanceKlass::cast(receiver_klass());
+methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
+return methodHandle(THREAD, m_oop);
+}
+}
+void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
+// Verify type.
+Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
+verify_method_type(m, mtype, false, KlassHandle(), CHECK);
+// Verify vmslots.
+if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
+}
+}
+void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
+// Check arguments.
+if (mh.is_null() || m.is_null() ||
+(!do_dispatch && m->is_abstract())) {
+THROW(vmSymbols::java_lang_InternalError());
+}
+java_dyn_MethodHandle::init_vmslots(mh());
+if (VerifyMethodHandles) {
+// The privileged code which invokes this routine should not make
+// a mistake about types, but it's better to verify.
+verify_DirectMethodHandle(mh, m, CHECK);
+}
+// Finally, after safety checks are done, link to the target method.
+// We will follow the same path as the latter part of
+// InterpreterRuntime::resolve_invoke(), which first finds the method
+// and then decides how to populate the constant pool cache entry
+// that links the interpreter calls to the method.  We need the same
+// bits, and will use the same calling sequence code.
+int vmindex = methodOopDesc::garbage_vtable_index;
+oop vmtarget = NULL;
+instanceKlass::cast(m->method_holder())->link_class(CHECK);
+MethodHandleEntry* me = NULL;
+if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
+// We are simulating an invokeinterface instruction.
+// (We might also be simulating an invokevirtual on a miranda method,
+// but it is safe to treat it as an invokeinterface.)
+assert(!m->can_be_statically_bound(), "no final methods on interfaces");
+vmindex = klassItable::compute_itable_index(m());
+assert(vmindex >= 0, "(>=0) == do_dispatch");
+// Set up same bits as ConstantPoolCacheEntry::set_interface_call().
+vmtarget = m->method_holder(); // the interface
+me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
+} else if (!do_dispatch || m->can_be_statically_bound()) {
+// We are simulating an invokestatic or invokespecial instruction.
+// Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
+vmtarget = m();
+// this does not help dispatch, but it will make it possible to parse this MH:
+vmindex  = methodOopDesc::nonvirtual_vtable_index;
+assert(vmindex < 0, "(>=0) == do_dispatch");
+if (!m->is_static()) {
+me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
+} else {
+me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
+// Part of the semantics of a static call is an initialization barrier.
+// For a DMH, it is done now, when the handle is created.
+Klass* k = Klass::cast(m->method_holder());
+if (k->should_be_initialized()) {
+k->initialize(CHECK);
+}
+}
+} else {
+// We are simulating an invokevirtual instruction.
+// Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
+// The key logic is LinkResolver::runtime_resolve_virtual_method.
+vmindex  = m->vtable_index();
+vmtarget = m->method_holder();
+me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
+}
+if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget);
+sun_dyn_DirectMethodHandle::set_vmindex(mh(),  vmindex);
+DEBUG_ONLY(int flags; klassOop rlimit);
+assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(),
+"properly stored for later decoding");
+DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
+assert(!(actual_do_dispatch && !do_dispatch),
+"do not perform dispatch if !do_dispatch specified");
+assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
+assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
+// Done!
+java_dyn_MethodHandle::set_vmentry(mh(), me);
+}
+void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
+methodHandle m,
+TRAPS) {
+// Verify type.
+oop receiver = sun_dyn_BoundMethodHandle::argument(mh());
+Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
+KlassHandle bound_recv_type;
+if (receiver != NULL)  bound_recv_type = KlassHandle(THREAD, receiver->klass());
+verify_method_type(m, mtype, true, bound_recv_type, CHECK);
+int receiver_pos = m->size_of_parameters() - 1;
+// Verify MH.vmargslot, which should point at the bound receiver.
+verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
+//verify_vmslots(mh, CHECK);
+// Verify vmslots.
+if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
+}
+}
+// Initialize a BMH with a receiver bound directly to a methodOop.
+void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
+methodHandle original_m,
+KlassHandle receiver_limit,
+int decode_flags,
+TRAPS) {
+// Check arguments.
+if (mh.is_null() || original_m.is_null()) {
+THROW(vmSymbols::java_lang_InternalError());
+}
+KlassHandle receiver_klass;
+{
+oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh());
+if (receiver_oop != NULL)
+receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
+}
+methodHandle m = dispatch_decoded_method(original_m,
+receiver_limit, decode_flags,
+receiver_klass,
+CHECK);
+if (m.is_null())      { THROW(vmSymbols::java_lang_InternalError()); }
+if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
+java_dyn_MethodHandle::init_vmslots(mh());
+if (VerifyMethodHandles) {
+verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
+}
+sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
+DEBUG_ONLY(int junk; klassOop junk2);
+assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding");
+assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
+// Done!
+java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
+}
+void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
+bool direct_to_method, TRAPS) {
+Handle ptype_handle(THREAD,
+java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum));
+KlassHandle ptype_klass;
+BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
+int slots_pushed = type2size[ptype];
+oop argument = sun_dyn_BoundMethodHandle::argument(mh());
+const char* err = NULL;
+switch (ptype) {
+case T_OBJECT:
+if (argument != NULL)
+// we must implicitly convert from the arg type to the outgoing ptype
+err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
+break;
+case T_ARRAY: case T_VOID:
+assert(false, "array, void do not appear here");
+default:
+if (ptype != T_INT && !is_subword_type(ptype)) {
+err = "unexpected parameter type";
+break;
+}
+// check subrange of Integer.value, if necessary
+if (argument == NULL || argument->klass() != SystemDictionary::int_klass()) {
+err = "bound integer argument must be of type java.lang.Integer";
+break;
+}
+if (ptype != T_INT) {
+int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
+jint value = argument->int_field(value_offset);
+int vminfo = adapter_subword_vminfo(ptype);
+jint subword = truncate_subword_from_vminfo(value, vminfo);
+if (value != subword) {
+err = "bound subword value does not fit into the subword type";
+break;
+}
+}
+break;
+case T_FLOAT:
+case T_DOUBLE:
+case T_LONG:
+{
+// we must implicitly convert from the unboxed arg type to the outgoing ptype
+BasicType argbox = java_lang_boxing_object::basic_type(argument);
+if (argbox != ptype) {
+err = check_argument_type_change(T_OBJECT, (argument == NULL
+? SystemDictionary::object_klass()
+: argument->klass()),
+ptype, ptype_klass(), argnum);
+assert(err != NULL, "this must be an error");
+}
+break;
+}
+}
+if (err == NULL) {
+DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
+if (direct_to_method) {
+assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
+assert(slots_pushed <= MethodHandlePushLimit, "");
+} else {
+int prev_pushes = decode_MethodHandle_stack_pushes(target());
+assert(this_pushes == slots_pushed + prev_pushes, "BMH stack motion must be correct");
+// do not blow the stack; use a Java-based adapter if this limit is exceeded
+if (slots_pushed + prev_pushes > MethodHandlePushLimit)
+err = "too many bound parameters";
+}
+}
+if (err == NULL) {
+// Verify the rest of the method type.
+err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()),
+argnum, ptype_handle(),
+java_dyn_MethodHandle::type(target()));
+}
+if (err != NULL) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), err);
+}
+}
+void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
+// Check arguments.
+if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) {
+THROW(vmSymbols::java_lang_InternalError());
+}
+java_dyn_MethodHandle::init_vmslots(mh());
+if (VerifyMethodHandles) {
+int insert_after = argnum - 1;
+verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
+verify_vmslots(mh, CHECK);
+}
+// If (a) the target is a direct non-dispatched method handle,
+// or (b) the target is a dispatched direct method handle and we
+// are binding the receiver, cut out the middle-man.
+// Do this by decoding the DMH and using its methodOop directly as vmtarget.
+bool direct_to_method = false;
+if (OptimizeMethodHandles &&
+target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
+(argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) {
+int decode_flags = 0; klassOop receiver_limit_oop = NULL;
+methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags));
+if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
+DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - 1); // pos. of 1st arg.
+assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
+if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
+KlassHandle receiver_limit(THREAD, receiver_limit_oop);
+init_BoundMethodHandle_with_receiver(mh, m,
+receiver_limit, decode_flags,
+CHECK);
+return;
+}
+// Even if it is not a bound receiver, we still might be able
+// to bind another argument and still invoke the methodOop directly.
+if (!(decode_flags & _dmf_does_dispatch)) {
+direct_to_method = true;
+sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
+}
+}
+if (!direct_to_method)
+sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target());
+if (VerifyMethodHandles) {
+verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
+}
+// Next question:  Is this a ref, int, or long bound value?
+oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum);
+BasicType ptype = java_lang_Class::as_BasicType(ptype_oop);
+int slots_pushed = type2size[ptype];
+MethodHandleEntry* me = NULL;
+if (ptype == T_OBJECT) {
+if (direct_to_method)  me = MethodHandles::entry(_bound_ref_direct_mh);
+else                   me = MethodHandles::entry(_bound_ref_mh);
+} else if (slots_pushed == 2) {
+if (direct_to_method)  me = MethodHandles::entry(_bound_long_direct_mh);
+else                   me = MethodHandles::entry(_bound_long_mh);
+} else if (slots_pushed == 1) {
+if (direct_to_method)  me = MethodHandles::entry(_bound_int_direct_mh);
+else                   me = MethodHandles::entry(_bound_int_mh);
+} else {
+assert(false, "");
+}
+// Done!
+java_dyn_MethodHandle::set_vmentry(mh(), me);
+}
+static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
+char msg[200];
+jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
+}
+void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
+jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
+int  argslot    = sun_dyn_AdapterMethodHandle::vmargslot(mh());
+verify_vmargslot(mh, argnum, argslot, CHECK);
+verify_vmslots(mh, CHECK);
+jint conv_op    = adapter_conversion_op(conversion);
+if (!conv_op_valid(conv_op)) {
+throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
+return;
+}
+EntryKind ek = adapter_entry_kind(conv_op);
+int stack_move = adapter_conversion_stack_move(conversion);
+BasicType src  = adapter_conversion_src_type(conversion);
+BasicType dest = adapter_conversion_dest_type(conversion);
+int vminfo     = adapter_conversion_vminfo(conversion); // should be zero
+Handle argument(THREAD,  sun_dyn_AdapterMethodHandle::argument(mh()));
+Handle target(THREAD,    sun_dyn_AdapterMethodHandle::vmtarget(mh()));
+Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh()));
+Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target()));
+const char* err = NULL;
+if (err == NULL) {
+// Check that the correct argument is supplied, but only if it is required.
+switch (ek) {
+case _adapter_check_cast:     // target type of cast
+case _adapter_ref_to_prim:    // wrapper type from which to unbox
+case _adapter_prim_to_ref:    // wrapper type to box into
+case _adapter_collect_args:   // array type to collect into
+case _adapter_spread_args:    // array type to spread from
+if (!java_lang_Class::is_instance(argument())
+|| java_lang_Class::is_primitive(argument()))
+{ err = "adapter requires argument of type java.lang.Class"; break; }
+if (ek == _adapter_collect_args ||
+ek == _adapter_spread_args) {
+// Make sure it is a suitable collection type.  (Array, for now.)
+Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
+if (!ak->oop_is_objArray()) {
+{ err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
+}
+}
+break;
+case _adapter_flyby:
+case _adapter_ricochet:
+if (!java_dyn_MethodHandle::is_instance(argument()))
+{ err = "MethodHandle adapter argument required"; break; }
+break;
+default:
+if (argument.not_null())
+{ err = "adapter has spurious argument"; break; }
+break;
+}
+}
+if (err == NULL) {
+// Check that the src/dest types are supplied if needed.
+switch (ek) {
+case _adapter_prim_to_prim:
+if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
+err = "adapter requires primitive src/dest conversion subfields"; break;
+}
+if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
+!(src == T_FLOAT || src == T_DOUBLE) &&  (dest == T_FLOAT || dest == T_DOUBLE)) {
+err = "adapter cannot convert beween floating and fixed-point"; break;
+}
+break;
+case _adapter_ref_to_prim:
+if (src != T_OBJECT || !is_java_primitive(dest)
+|| argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
+err = "adapter requires primitive dest conversion subfield"; break;
+}
+break;
+case _adapter_prim_to_ref:
+if (!is_java_primitive(src) || dest != T_OBJECT
+|| argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
+err = "adapter requires primitive src conversion subfield"; break;
+}
+break;
+case _adapter_swap_args:
+case _adapter_rot_args:
+{
+if (!src || src != dest) {
+err = "adapter requires src/dest conversion subfields for swap"; break;
+}
+int swap_size = type2size[src];
+oop src_mtype  = sun_dyn_AdapterMethodHandle::type(target());
+oop dest_mtype = sun_dyn_AdapterMethodHandle::type(mh());
+int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(src_mtype);
+int src_slot   = argslot;
+int dest_slot  = vminfo;
+bool rotate_up = (src_slot > dest_slot); // upward rotation
+int src_arg    = argnum;
+int dest_arg   = argument_slot_to_argnum(dest_mtype, dest_slot);
+verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
+if (!(dest_slot >= src_slot + swap_size) &&
+!(src_slot >= dest_slot + swap_size)) {
+err = "source, destination slots must be distinct";
+} else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
+err = "source of swap must be deeper in stack";
+} else if (ek == _adapter_swap_args) {
+err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg),
+java_dyn_MethodType::ptype(dest_mtype, src_arg),
+dest_arg);
+} else if (ek == _adapter_rot_args) {
+if (rotate_up) {
+assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
+// rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
+// that is:   [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
+for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
+err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
+java_dyn_MethodType::ptype(dest_mtype, i-1),
+i);
+}
+} else { // rotate down
+assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
+// rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
+// that is:     [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
+for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
+err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
+java_dyn_MethodType::ptype(dest_mtype, i+1),
+i);
+}
+}
+}
+if (err == NULL)
+err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg),
+java_dyn_MethodType::ptype(dest_mtype, dest_arg),
+src_arg);
+}
+break;
+case _adapter_collect_args:
+case _adapter_spread_args:
+{
+BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
+BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
+if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
+err = "adapter requires src/dest subfields"; break;
+// later:
+// - consider making coll be a primitive array
+// - consider making coll be a heterogeneous collection
+}
+}
+break;
+default:
+if (src != 0 || dest != 0) {
+err = "adapter has spurious src/dest conversion subfields"; break;
+}
+break;
+}
+}
+if (err == NULL) {
+// Check the stack_move subfield.
+// It must always report the net change in stack size, positive or negative.
+int slots_pushed = stack_move / stack_move_unit();
+switch (ek) {
+case _adapter_prim_to_prim:
+case _adapter_ref_to_prim:
+case _adapter_prim_to_ref:
+if (slots_pushed != type2size[dest] - type2size[src]) {
+err = "wrong stack motion for primitive conversion";
+}
+break;
+case _adapter_dup_args:
+if (slots_pushed <= 0) {
+err = "adapter requires conversion subfield slots_pushed > 0";
+}
+break;
+case _adapter_drop_args:
+if (slots_pushed >= 0) {
+err = "adapter requires conversion subfield slots_pushed < 0";
+}
+break;
+case _adapter_collect_args:
+if (slots_pushed > 1) {
+err = "adapter requires conversion subfield slots_pushed <= 1";
+}
+break;
+case _adapter_spread_args:
+if (slots_pushed < -1) {
+err = "adapter requires conversion subfield slots_pushed >= -1";
+}
+break;
+default:
+if (stack_move != 0) {
+err = "adapter has spurious stack_move conversion subfield";
+}
+break;
+}
+if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
+err = "stack_move conversion subfield must be multiple of stack_move_unit";
+}
+}
+if (err == NULL) {
+// Make sure this adapter does not push too deeply.
+int slots_pushed = stack_move / stack_move_unit();
+int this_vmslots = java_dyn_MethodHandle::vmslots(mh());
+int prev_vmslots = java_dyn_MethodHandle::vmslots(target());
+if (slots_pushed != (this_vmslots - prev_vmslots)) {
+err = "stack_move inconsistent with previous and current MethodType vmslots";
+} else if (slots_pushed > 0)  {
+// verify stack_move against MethodHandlePushLimit
+int prev_pushes = decode_MethodHandle_stack_pushes(target());
+// do not blow the stack; use a Java-based adapter if this limit is exceeded
+if (slots_pushed + prev_pushes > MethodHandlePushLimit) {
+err = "adapter pushes too many parameters";
+}
+}
+// While we're at it, check that the stack motion decoder works:
+DEBUG_ONLY(int prev_pushes = decode_MethodHandle_stack_pushes(target()));
+DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
+assert(this_pushes == slots_pushed + prev_pushes, "AMH stack motion must be correct");
+}
+if (err == NULL && vminfo != 0) {
+switch (ek) {
+case _adapter_swap_args:
+case _adapter_rot_args:
+break;                // OK
+default:
+err = "vminfo subfield is reserved to the JVM";
+}
+}
+// Do additional ad hoc checks.
+if (err == NULL) {
+switch (ek) {
+case _adapter_retype_only:
+err = check_method_type_passthrough(src_mtype(), dst_mtype());
+break;
+case _adapter_check_cast:
+{
+// The actual value being checked must be a reference:
+err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum),
+object_java_mirror(), argnum);
+if (err != NULL)  break;
+// The output of the cast must fit with the destination argument:
+Handle cast_class = argument;
+err = check_method_type_conversion(src_mtype(),
+argnum, cast_class(),
+dst_mtype());
+}
+break;
+// %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
+}
+}
+if (err != NULL) {
+throw_InternalError_for_bad_conversion(conversion, err, THREAD);
+return;
+}
+}
+void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
+oop  argument   = sun_dyn_AdapterMethodHandle::argument(mh());
+int  argslot    = sun_dyn_AdapterMethodHandle::vmargslot(mh());
+jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
+jint conv_op    = adapter_conversion_op(conversion);
+// adjust the adapter code to the internal EntryKind enumeration:
+EntryKind ek_orig = adapter_entry_kind(conv_op);
+EntryKind ek_opt  = ek_orig;  // may be optimized
+// Finalize the vmtarget field (Java initialized it to null).
+if (!java_dyn_MethodHandle::is_instance(target())) {
+throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
+return;
+}
+sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target());
+if (VerifyMethodHandles) {
+verify_AdapterMethodHandle(mh, argnum, CHECK);
+}
+int stack_move = adapter_conversion_stack_move(conversion);
+BasicType src  = adapter_conversion_src_type(conversion);
+BasicType dest = adapter_conversion_dest_type(conversion);
+int vminfo     = adapter_conversion_vminfo(conversion); // should be zero
+const char* err = NULL;
+// Now it's time to finish the case analysis and pick a MethodHandleEntry.
+switch (ek_orig) {
+case _adapter_retype_only:
+case _adapter_check_cast:
+case _adapter_dup_args:
+case _adapter_drop_args:
+// these work fine via general case code
+break;
+case _adapter_prim_to_prim:
+{
+// Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
+// And, the {float,double} -> {int,long} cases must be handled by Java.
+switch (type2size[src] *4+ type2size[dest]) {
+case 1 *4+ 1:
+assert(src == T_INT || is_subword_type(src), "source is not float");
+// Subword-related cases are int -> {boolean,byte,char,short}.
+ek_opt = _adapter_opt_i2i;
+vminfo = adapter_subword_vminfo(dest);
+break;
+case 2 *4+ 1:
+if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
+ek_opt = _adapter_opt_l2i;
+vminfo = adapter_subword_vminfo(dest);
+} else if (src == T_DOUBLE && dest == T_FLOAT) {
+ek_opt = _adapter_opt_d2f;
+} else {
+assert(false, "");
+}
+break;
+case 1 *4+ 2:
+if (src == T_INT && dest == T_LONG) {
+ek_opt = _adapter_opt_i2l;
+} else if (src == T_FLOAT && dest == T_DOUBLE) {
+ek_opt = _adapter_opt_f2d;
+} else {
+assert(false, "");
+}
+break;
+default:
+assert(false, "");
+break;
+}
+}
+break;
+case _adapter_ref_to_prim:
+{
+switch (type2size[dest]) {
+case 1:
+ek_opt = _adapter_opt_unboxi;
+vminfo = adapter_subword_vminfo(dest);
+break;
+case 2:
+ek_opt = _adapter_opt_unboxl;
+break;
+default:
+assert(false, "");
+break;
+}
+}
+break;
+case _adapter_prim_to_ref:
+goto throw_not_impl;        // allocates, hence could block
+case _adapter_swap_args:
+case _adapter_rot_args:
+{
+int swap_slots = type2size[src];
+oop mtype      = sun_dyn_AdapterMethodHandle::type(mh());
+int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mtype);
+int src_slot   = argslot;
+int dest_slot  = vminfo;
+int rotate     = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
+switch (swap_slots) {
+case 1:
+ek_opt = (!rotate    ? _adapter_opt_swap_1 :
+rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
+break;
+case 2:
+ek_opt = (!rotate    ? _adapter_opt_swap_2 :
+rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
+break;
+default:
+assert(false, "");
+break;
+}
+}
+break;
+case _adapter_collect_args:
+goto throw_not_impl;        // allocates, hence could block
+case _adapter_spread_args:
+{
+// vminfo will be the required length of the array
+int slots_pushed = stack_move / stack_move_unit();
+int array_size   = slots_pushed + 1;
+assert(array_size >= 0, "");
+vminfo = array_size;
+switch (array_size) {
+case 0:   ek_opt = _adapter_opt_spread_0;       break;
+case 1:   ek_opt = _adapter_opt_spread_1;       break;
+default:  ek_opt = _adapter_opt_spread_more;    break;
+}
+if ((vminfo & CONV_VMINFO_MASK) != vminfo)
+goto throw_not_impl;    // overflow
+}
+break;
+case _adapter_flyby:
+case _adapter_ricochet:
+goto throw_not_impl;        // runs Java code, hence could block
+default:
+// should have failed much earlier; must be a missing case here
+assert(false, "incomplete switch");
+// and fall through:
+throw_not_impl:
+// FIXME: these adapters are NYI
+err = "adapter not yet implemented in the JVM";
+break;
+}
+if (err != NULL) {
+throw_InternalError_for_bad_conversion(conversion, err, THREAD);
+return;
+}
+// Rebuild the conversion value; maybe parts of it were changed.
+jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
+// Finalize the conversion field.  (Note that it is final to Java code.)
+sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion);
+// Done!
+java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt));
+// There should be enough memory barriers on exit from native methods
+// to ensure that the MH is fully initialized to all threads before
+// Java code can publish it in global data structures.
+}
+//
+// Here are the native methods on sun.dyn.MethodHandleImpl.
+// 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.
+//
+// direct method handles for invokestatic or invokespecial
+// void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
+JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
+jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
+ResourceMark rm;              // for error messages
+// This is the guy we are initializing:
+if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
+// Early returns out of this method leave the DMH in an unfinished state.
+assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
+// which method are we really talking about?
+if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+oop target_oop = JNIHandles::resolve_non_null(target_jh);
+if (sun_dyn_MemberName::is_instance(target_oop) &&
+sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) {
+Handle mname(THREAD, target_oop);
+MethodHandles::resolve_MemberName(mname, CHECK);
+target_oop = mname(); // in case of GC
+}
+int decode_flags = 0; klassOop receiver_limit = NULL;
+methodHandle m(THREAD,
+MethodHandles::decode_method(target_oop,
+receiver_limit, decode_flags));
+if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
+// 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) {
+KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
+// If this were a bytecode, the first access check would be against
+// the "reference class" mentioned in the CONSTANT_Methodref.
+// For that class, we use the defining class of m,
+// or a more specific receiver limit if available.
+klassOop reference_klass = m->method_holder();  // OK approximation
+if (receiver_limit != NULL && receiver_limit != reference_klass) {
+if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass))
+THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds");  // Java code bug
+reference_klass = receiver_limit;
+}
+// Emulate LinkResolver::check_klass_accessability.
+if (!Reflection::verify_class_access(caller->as_klassOop(),
+reference_klass,
+true)) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name());
+}
+// If there were a bytecode, the next step would be to lookup the method
+// in the reference class, then then check the method's access bits.
+// Emulate LinkResolver::check_method_accessability.
+klassOop resolved_klass = m->method_holder();
+if (!Reflection::verify_field_access(caller->as_klassOop(),
+resolved_klass, reference_klass,
+m->access_flags(),
+true)) {
+// %%% following cutout belongs in Reflection::verify_field_access?
+bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
+reference_klass, THREAD);
+if (!same_pm) {
+THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
+}
+}
+}
+MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
+}
+JVM_END
+// bound method handles
+JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
+jobject target_jh, int argnum)) {
+ResourceMark rm;              // for error messages
+// This is the guy we are initializing:
+if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
+// Early returns out of this method leave the BMH in an unfinished state.
+assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
+if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
+if (!java_dyn_MethodHandle::is_instance(target())) {
+// Target object is a reflective method.  (%%% Do we need this alternate path?)
+Untested("init_BMH of non-MH");
+if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
+int decode_flags = 0; klassOop receiver_limit_oop = NULL;
+methodHandle m(THREAD,
+MethodHandles::decode_method(target(),
+receiver_limit_oop,
+decode_flags));
+KlassHandle receiver_limit(THREAD, receiver_limit_oop);
+MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
+receiver_limit,
+decode_flags,
+CHECK);
+return;
+}
+// Build a BMH on top of a DMH or another BMH:
+MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
+}
+JVM_END
+// adapter method handles
+JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
+jobject target_jh, int argnum)) {
+// This is the guy we are initializing:
+if (mh_jh == NULL || target_jh == NULL) {
+THROW(vmSymbols::java_lang_InternalError());
+}
+Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
+Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
+// Early returns out of this method leave the AMH in an unfinished state.
+assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
+MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
+}
+JVM_END
+// method type forms
+JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
+if (erased_jh == NULL)  return;
+if (TraceMethodHandles) {
+tty->print("creating MethodType form ");
+if (WizardMode || Verbose) {   // Warning: this calls Java code on the MH!
+// call Object.toString()
+symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature();
+JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
+JavaValue result(T_OBJECT);
+JavaCalls::call_virtual(&result, SystemDictionary::object_klass(), name, sig,
+&args, CHECK);
+Handle str(THREAD, (oop)result.get_jobject());
+java_lang_String::print(str, tty);
+}
+tty->cr();
+}
+}
+JVM_END
+// debugging and reflection
+JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
+Handle mh(THREAD, JNIHandles::resolve(mh_jh));
+if (!java_dyn_MethodHandle::is_instance(mh())) {
+THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
+}
+oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
+return JNIHandles::make_local(THREAD, target);
+}
+JVM_END
+JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) {
+switch (which) {
+case MethodHandles::GC_JVM_PUSH_LIMIT:
+guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
+"MethodHandlePushLimit parameter must be in valid range");
+return MethodHandlePushLimit;
+case MethodHandles::GC_JVM_STACK_MOVE_LIMIT:
+// return number of words per slot, signed according to stack direction
+return MethodHandles::stack_move_unit();
+}
+return 0;
+}
+JVM_END
+#ifndef PRODUCT
+#define EACH_NAMED_CON(template) \
+template(MethodHandles,GC_JVM_PUSH_LIMIT) \
+template(MethodHandles,GC_JVM_STACK_MOVE_LIMIT) \
+template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
+template(MethodHandles,ETF_DIRECT_HANDLE) \
+template(MethodHandles,ETF_METHOD_NAME) \
+template(MethodHandles,ETF_REFLECT_METHOD) \
+template(sun_dyn_MemberName,MN_IS_METHOD) \
+template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \
+template(sun_dyn_MemberName,MN_IS_FIELD) \
+template(sun_dyn_MemberName,MN_IS_TYPE) \
+template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \
+template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \
+template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \
+template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \
+template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \
+template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
+template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \
+template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \
+template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \
+template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \
+template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \
+template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \
+template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \
+template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \
+template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \
+template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \
+template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \
+template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \
+template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \
+template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
+template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \
+template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
+template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
+template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
+template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
+/*end*/
+#define ONE_PLUS(scope,value) 1+
+static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
+#define VALUE_COMMA(scope,value) scope::value,
+static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
+#define STRING_NULL(scope,value) #value "\0"
+static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
+#undef ONE_PLUS
+#undef VALUE_COMMA
+#undef STRING_NULL
+#undef EACH_NAMED_CON
+#endif
+JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
+#ifndef PRODUCT
+if (which >= 0 && which < con_value_count) {
+int con = con_values[which];
+objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh);
+if (box != 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);
+box->obj_at_put(0, name);
+}
+return con;
+}
+#endif
+return 0;
+}
+JVM_END
+// void init(MemberName self, AccessibleObject ref)
+JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
+if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
+oop target_oop = JNIHandles::resolve_non_null(target_jh);
+MethodHandles::init_MemberName(mname(), target_oop);
+}
+JVM_END
+// void expand(MemberName self)
+JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
+if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+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(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
+if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
+// %%% take caller into account!
+MethodHandles::resolve_MemberName(mname, CHECK);
+}
+JVM_END
+//  static native int getMembers(Class<?> defc, String matchName, String matchSig,
+//          int matchFlags, Class<?> caller, int skip, MemberName[] results);
+JVM_ENTRY(jint, MHI_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;
+klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh));
+objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh);
+if (results == NULL || !results->is_objArray())       return -1;
+symbolOop name = NULL, 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
+}
+klassOop 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_klassOop(caller_oop);
+}
+if (name != NULL && sig != NULL && results != NULL) {
+// try a direct resolve
+// %%% TO DO
+}
+int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags,
+caller, skip, results);
+// TO DO: expand at least some of the MemberNames, to avoid massive callbacks
+return res;
+}
+JVM_END
+/// JVM_RegisterMethodHandleMethods
+#define ADR "J"
+#define LANG "Ljava/lang/"
+#define JDYN "Ljava/dyn/"
+#define IDYN "Lsun/dyn/"
+#define OBJ   LANG"Object;"
+#define CLS   LANG"Class;"
+#define STRG  LANG"String;"
+#define MT    JDYN"MethodType;"
+#define MH    JDYN"MethodHandle;"
+#define MHI   IDYN"MethodHandleImpl;"
+#define MEM   IDYN"MemberName;"
+#define AMH   IDYN"AdapterMethodHandle;"
+#define BMH   IDYN"BoundMethodHandle;"
+#define DMH   IDYN"DirectMethodHandle;"
+#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 sun.dyn.MethodHandleNatives.
+static JNINativeMethod methods[] = {
+// void init(MemberName self, AccessibleObject ref)
+{CC"init",                    CC"("AMH""MH"I)V",              FN_PTR(MHI_init_AMH)},
+{CC"init",                    CC"("BMH""OBJ"I)V",             FN_PTR(MHI_init_BMH)},
+{CC"init",                    CC"("DMH""OBJ"Z"CLS")V",        FN_PTR(MHI_init_DMH)},
+{CC"init",                    CC"("MT")V",                    FN_PTR(MHI_init_MT)},
+{CC"init",                    CC"("MEM""OBJ")V",              FN_PTR(MHI_init_Mem)},
+{CC"expand",                  CC"("MEM")V",                   FN_PTR(MHI_expand_Mem)},
+{CC"resolve",                 CC"("MEM""CLS")V",              FN_PTR(MHI_resolve_Mem)},
+{CC"getTarget",               CC"("MH"I)"OBJ,                 FN_PTR(MHI_getTarget)},
+{CC"getConstant",             CC"(I)I",                       FN_PTR(MHI_getConstant)},
+//  static native int getNamedCon(int which, Object[] name)
+{CC"getNamedCon",             CC"(I["OBJ")I",                 FN_PTR(MHI_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(MHI_getMembers)}
+};
+// This one function is exported, used by NativeLookup.
+JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
+assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
+if (!EnableMethodHandles) {
+warning("JSR 292 method handles are disabled in this JVM.  Use -XX:+EnableMethodHandles to enable.");
+return;  // bind nothing
+}
+{
+ThreadToNativeFromVM ttnfv(thread);
+int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
+if (env->ExceptionOccurred()) {
+MethodHandles::set_enabled(false);
+warning("JSR 292 method handle code is mismatched to this JVM.  Disabling support.");
+env->ExceptionClear();
+} else {
+MethodHandles::set_enabled(true);
+}
+}
+}
+JVM_END

Mercurial > hg > truffle

comparison src/share/vm/prims/methodHandles.cpp @ 710:e5b0439ef4ae