--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/prims/methodHandles.cpp Wed Apr 08 10:56:49 2009 -0700
@@ -0,0 +1,2347 @@
+/*
+ * 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