| /* |
| * 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_ENTRY(void, MH_linkCallSite(JNIEnv *env, jobject igcls, jobject site_jh, jobject target_jh)) { |
| // No special action required, yet. |
| oop site_oop = JNIHandles::resolve(site_jh); |
| if (site_oop == NULL || site_oop->klass() != SystemDictionary::CallSiteImpl_klass()) |
| THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "call site"); |
| sun_dyn_CallSiteImpl::set_target(site_oop, JNIHandles::resolve(target_jh)); |
| } |
| 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 CSTI IDYN"CallSiteImpl;" |
| |
| #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)} |
| }; |
| |
| // More entry points specifically for EnableInvokeDynamic. |
| static JNINativeMethod methods2[] = { |
| {CC"linkCallSite", CC"("CSTI MH")V", FN_PTR(MH_linkCallSite)} |
| }; |
| |
| |
| // 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"); |
| |
| // note: this explicit warning-producing stuff will be replaced by auto-detection of the JSR 292 classes |
| |
| 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); |
| } |
| } |
| |
| if (!EnableInvokeDynamic) { |
| warning("JSR 292 invokedynamic is disabled in this JVM. Use -XX:+EnableInvokeDynamic to enable."); |
| return; // bind nothing |
| } |
| |
| { |
| ThreadToNativeFromVM ttnfv(thread); |
| |
| int status = env->RegisterNatives(MHN_class, methods2, sizeof(methods2)/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 |