/* * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "interpreter/rewriter.hpp" #include "memory/oopFactory.hpp" #include "prims/methodHandleWalk.hpp" /* * JSR 292 reference implementation: method handle structure analysis */ #ifdef PRODUCT #define print_method_handle(mh) {} #else //PRODUCT extern "C" void print_method_handle(oop mh); #endif //PRODUCT // ----------------------------------------------------------------------------- // MethodHandleChain void MethodHandleChain::set_method_handle(Handle mh, TRAPS) { if (!java_lang_invoke_MethodHandle::is_instance(mh())) lose("bad method handle", CHECK); // set current method handle and unpack partially _method_handle = mh; _is_last = false; _is_bound = false; _arg_slot = -1; _arg_type = T_VOID; _conversion = -1; _last_invoke = Bytecodes::_nop; //arbitrary non-garbage if (java_lang_invoke_DirectMethodHandle::is_instance(mh())) { set_last_method(mh(), THREAD); return; } if (java_lang_invoke_AdapterMethodHandle::is_instance(mh())) { _conversion = AdapterMethodHandle_conversion(); assert(_conversion != -1, "bad conv value"); assert(java_lang_invoke_BoundMethodHandle::is_instance(mh()), "also BMH"); } if (java_lang_invoke_BoundMethodHandle::is_instance(mh())) { if (!is_adapter()) // keep AMH and BMH separate in this model _is_bound = true; _arg_slot = BoundMethodHandle_vmargslot(); oop target = MethodHandle_vmtarget_oop(); if (!is_bound() || java_lang_invoke_MethodHandle::is_instance(target)) { _arg_type = compute_bound_arg_type(target, NULL, _arg_slot, CHECK); } else if (target != NULL && target->is_method()) { methodOop m = (methodOop) target; _arg_type = compute_bound_arg_type(NULL, m, _arg_slot, CHECK); set_last_method(mh(), CHECK); } else { _is_bound = false; // lose! } } if (is_bound() && _arg_type == T_VOID) { lose("bad vmargslot", CHECK); } if (!is_bound() && !is_adapter()) { lose("unrecognized MH type", CHECK); } } void MethodHandleChain::set_last_method(oop target, TRAPS) { _is_last = true; KlassHandle receiver_limit; int flags = 0; _last_method = MethodHandles::decode_method(target, receiver_limit, flags); if ((flags & MethodHandles::_dmf_has_receiver) == 0) _last_invoke = Bytecodes::_invokestatic; else if ((flags & MethodHandles::_dmf_does_dispatch) == 0) _last_invoke = Bytecodes::_invokespecial; else if ((flags & MethodHandles::_dmf_from_interface) != 0) _last_invoke = Bytecodes::_invokeinterface; else _last_invoke = Bytecodes::_invokevirtual; } BasicType MethodHandleChain::compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS) { // There is no direct indication of whether the argument is primitive or not. // It is implied by the _vmentry code, and by the MethodType of the target. BasicType arg_type = T_VOID; if (target != NULL) { oop mtype = java_lang_invoke_MethodHandle::type(target); int arg_num = MethodHandles::argument_slot_to_argnum(mtype, arg_slot); if (arg_num >= 0) { oop ptype = java_lang_invoke_MethodType::ptype(mtype, arg_num); arg_type = java_lang_Class::as_BasicType(ptype); } } else if (m != NULL) { // figure out the argument type from the slot // FIXME: make this explicit in the MH int cur_slot = m->size_of_parameters(); if (arg_slot >= cur_slot) return T_VOID; if (!m->is_static()) { cur_slot -= type2size[T_OBJECT]; if (cur_slot == arg_slot) return T_OBJECT; } ResourceMark rm(THREAD); for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { BasicType bt = ss.type(); cur_slot -= type2size[bt]; if (cur_slot <= arg_slot) { if (cur_slot == arg_slot) arg_type = bt; break; } } } if (arg_type == T_ARRAY) arg_type = T_OBJECT; return arg_type; } void MethodHandleChain::lose(const char* msg, TRAPS) { _lose_message = msg; #ifdef ASSERT if (Verbose) { tty->print_cr(INTPTR_FORMAT " lose: %s", _method_handle(), msg); print(); } #endif if (!THREAD->is_Java_thread() || ((JavaThread*)THREAD)->thread_state() != _thread_in_vm) { // throw a preallocated exception THROW_OOP(Universe::virtual_machine_error_instance()); } THROW_MSG(vmSymbols::java_lang_InternalError(), msg); } #ifdef ASSERT static const char* adapter_ops[] = { "retype_only" , "retype_raw" , "check_cast" , "prim_to_prim" , "ref_to_prim" , "prim_to_ref" , "swap_args" , "rot_args" , "dup_args" , "drop_args" , "collect_args" , "spread_args" , "fold_args" }; static const char* adapter_op_to_string(int op) { if (op >= 0 && op < ARRAY_SIZE(adapter_ops)) return adapter_ops[op]; return "unknown_op"; } void MethodHandleChain::print(Handle mh) { EXCEPTION_MARK; MethodHandleChain mhc(mh, THREAD); if (HAS_PENDING_EXCEPTION) { oop ex = THREAD->pending_exception(); CLEAR_PENDING_EXCEPTION; ex->print(); return; } mhc.print(); } void MethodHandleChain::print() { EXCEPTION_MARK; print_impl(THREAD); if (HAS_PENDING_EXCEPTION) { oop ex = THREAD->pending_exception(); CLEAR_PENDING_EXCEPTION; ex->print(); } } void MethodHandleChain::print_impl(TRAPS) { ResourceMark rm; MethodHandleChain chain(_root, CHECK); for (;;) { tty->print(INTPTR_FORMAT ": ", chain.method_handle()()); if (chain.is_bound()) { tty->print("bound: arg_type %s arg_slot %d", type2name(chain.bound_arg_type()), chain.bound_arg_slot()); oop o = chain.bound_arg_oop(); if (o != NULL) { if (o->is_instance()) { tty->print(" instance %s", o->klass()->klass_part()->internal_name()); } else { o->print(); } } } else if (chain.is_adapter()) { tty->print("adapter: arg_slot %d conversion op %s", chain.adapter_arg_slot(), adapter_op_to_string(chain.adapter_conversion_op())); switch (chain.adapter_conversion_op()) { case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY: case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW: case java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST: case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM: case java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM: case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF: break; case java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS: case java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS: { int dest_arg_slot = chain.adapter_conversion_vminfo(); tty->print(" dest_arg_slot %d type %s", dest_arg_slot, type2name(chain.adapter_conversion_src_type())); break; } case java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS: case java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS: { int dup_slots = chain.adapter_conversion_stack_pushes(); tty->print(" pushes %d", dup_slots); break; } case java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS: case java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS: { int coll_slots = chain.MethodHandle_vmslots(); tty->print(" coll_slots %d", coll_slots); break; } case java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS: { // Check the required length. int spread_slots = 1 + chain.adapter_conversion_stack_pushes(); tty->print(" spread_slots %d", spread_slots); break; } default: tty->print_cr("bad adapter conversion"); break; } } else { // DMH tty->print("direct: "); chain.last_method_oop()->print_short_name(tty); } tty->print(" ("); objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(chain.method_type_oop()); for (int i = ptypes->length() - 1; i >= 0; i--) { BasicType t = java_lang_Class::as_BasicType(ptypes->obj_at(i)); if (t == T_ARRAY) t = T_OBJECT; tty->print("%c", type2char(t)); if (t == T_LONG || t == T_DOUBLE) tty->print("_"); } tty->print(")"); BasicType rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(chain.method_type_oop())); if (rtype == T_ARRAY) rtype = T_OBJECT; tty->print("%c", type2char(rtype)); tty->cr(); if (!chain.is_last()) { chain.next(CHECK); } else { break; } } } #endif // ----------------------------------------------------------------------------- // MethodHandleWalker Bytecodes::Code MethodHandleWalker::conversion_code(BasicType src, BasicType dest) { if (is_subword_type(src)) { src = T_INT; // all subword src types act like int } if (src == dest) { return Bytecodes::_nop; } #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d)) switch (SRC_DEST(src, dest)) { case SRC_DEST(T_INT, T_LONG): return Bytecodes::_i2l; case SRC_DEST(T_INT, T_FLOAT): return Bytecodes::_i2f; case SRC_DEST(T_INT, T_DOUBLE): return Bytecodes::_i2d; case SRC_DEST(T_INT, T_BYTE): return Bytecodes::_i2b; case SRC_DEST(T_INT, T_CHAR): return Bytecodes::_i2c; case SRC_DEST(T_INT, T_SHORT): return Bytecodes::_i2s; case SRC_DEST(T_LONG, T_INT): return Bytecodes::_l2i; case SRC_DEST(T_LONG, T_FLOAT): return Bytecodes::_l2f; case SRC_DEST(T_LONG, T_DOUBLE): return Bytecodes::_l2d; case SRC_DEST(T_FLOAT, T_INT): return Bytecodes::_f2i; case SRC_DEST(T_FLOAT, T_LONG): return Bytecodes::_f2l; case SRC_DEST(T_FLOAT, T_DOUBLE): return Bytecodes::_f2d; case SRC_DEST(T_DOUBLE, T_INT): return Bytecodes::_d2i; case SRC_DEST(T_DOUBLE, T_LONG): return Bytecodes::_d2l; case SRC_DEST(T_DOUBLE, T_FLOAT): return Bytecodes::_d2f; } #undef SRC_DEST // cannot do it in one step, or at all return Bytecodes::_illegal; } // ----------------------------------------------------------------------------- // MethodHandleWalker::walk // MethodHandleWalker::ArgToken MethodHandleWalker::walk(TRAPS) { ArgToken empty = ArgToken(); // Empty return value. walk_incoming_state(CHECK_(empty)); for (;;) { set_method_handle(chain().method_handle_oop()); assert(_outgoing_argc == argument_count_slow(), "empty slots under control"); if (chain().is_adapter()) { int conv_op = chain().adapter_conversion_op(); int arg_slot = chain().adapter_arg_slot(); // Check that the arg_slot is valid. In most cases it must be // within range of the current arguments but there are some // exceptions. Those are sanity checked in their implemention // below. if ((arg_slot < 0 || arg_slot >= _outgoing.length()) && conv_op > java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW && conv_op != java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS && conv_op != java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS) { lose(err_msg("bad argument index %d", arg_slot), CHECK_(empty)); } bool retain_original_args = false; // used by fold/collect logic // perform the adapter action switch (conv_op) { case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY: // No changes to arguments; pass the bits through. break; case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW: { // To keep the verifier happy, emit bitwise ("raw") conversions as needed. // See MethodHandles::same_basic_type_for_arguments for allowed conversions. Handle incoming_mtype(THREAD, chain().method_type_oop()); Handle outgoing_mtype; { oop outgoing_mh_oop = chain().vmtarget_oop(); if (!java_lang_invoke_MethodHandle::is_instance(outgoing_mh_oop)) lose("outgoing target not a MethodHandle", CHECK_(empty)); outgoing_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(outgoing_mh_oop)); } int nptypes = java_lang_invoke_MethodType::ptype_count(outgoing_mtype()); if (nptypes != java_lang_invoke_MethodType::ptype_count(incoming_mtype())) lose("incoming and outgoing parameter count do not agree", CHECK_(empty)); // Argument types. for (int i = 0, slot = _outgoing.length() - 1; slot >= 0; slot--) { if (arg_type(slot) == T_VOID) continue; klassOop src_klass = NULL; klassOop dst_klass = NULL; BasicType src = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(incoming_mtype(), i), &src_klass); BasicType dst = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(outgoing_mtype(), i), &dst_klass); retype_raw_argument_type(src, dst, slot, CHECK_(empty)); i++; // We need to skip void slots at the top of the loop. } // Return type. { BasicType src = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(incoming_mtype())); BasicType dst = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(outgoing_mtype())); retype_raw_return_type(src, dst, CHECK_(empty)); } break; } case java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST: { // checkcast the Nth outgoing argument in place klassOop dest_klass = NULL; BasicType dest = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &dest_klass); assert(dest == T_OBJECT, ""); ArgToken arg = _outgoing.at(arg_slot); assert(dest == arg.basic_type(), ""); ArgToken new_arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg, CHECK_(empty)); assert(!arg.has_index() || arg.index() == new_arg.index(), "should be the same index"); debug_only(dest_klass = (klassOop)badOop); break; } case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM: { // i2l, etc., on the Nth outgoing argument in place BasicType src = chain().adapter_conversion_src_type(), dest = chain().adapter_conversion_dest_type(); ArgToken arg = _outgoing.at(arg_slot); Bytecodes::Code bc = conversion_code(src, dest); if (bc == Bytecodes::_nop) { break; } else if (bc != Bytecodes::_illegal) { arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty)); } else if (is_subword_type(dest)) { bc = conversion_code(src, T_INT); if (bc != Bytecodes::_illegal) { arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty)); bc = conversion_code(T_INT, dest); arg = make_conversion(dest, NULL, bc, arg, CHECK_(empty)); } } if (bc == Bytecodes::_illegal) { lose(err_msg("bad primitive conversion for %s -> %s", type2name(src), type2name(dest)), CHECK_(empty)); } change_argument(src, arg_slot, dest, arg); break; } case java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM: { // checkcast to wrapper type & call intValue, etc. BasicType dest = chain().adapter_conversion_dest_type(); ArgToken arg = _outgoing.at(arg_slot); arg = make_conversion(T_OBJECT, SystemDictionary::box_klass(dest), Bytecodes::_checkcast, arg, CHECK_(empty)); vmIntrinsics::ID unboxer = vmIntrinsics::for_unboxing(dest); if (unboxer == vmIntrinsics::_none) { lose("no unboxing method", CHECK_(empty)); } ArgToken arglist[2]; arglist[0] = arg; // outgoing 'this' arglist[1] = ArgToken(); // sentinel arg = make_invoke(NULL, unboxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_(empty)); change_argument(T_OBJECT, arg_slot, dest, arg); break; } case java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF: { // call wrapper type.valueOf BasicType src = chain().adapter_conversion_src_type(); vmIntrinsics::ID boxer = vmIntrinsics::for_boxing(src); if (boxer == vmIntrinsics::_none) { lose("no boxing method", CHECK_(empty)); } ArgToken arg = _outgoing.at(arg_slot); ArgToken arglist[2]; arglist[0] = arg; // outgoing value arglist[1] = ArgToken(); // sentinel arg = make_invoke(NULL, boxer, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(empty)); change_argument(src, arg_slot, T_OBJECT, arg); break; } case java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS: { int dest_arg_slot = chain().adapter_conversion_vminfo(); if (!has_argument(dest_arg_slot)) { lose("bad swap index", CHECK_(empty)); } // a simple swap between two arguments if (arg_slot > dest_arg_slot) { int tmp = arg_slot; arg_slot = dest_arg_slot; dest_arg_slot = tmp; } ArgToken a1 = _outgoing.at(arg_slot); ArgToken a2 = _outgoing.at(dest_arg_slot); change_argument(a2.basic_type(), dest_arg_slot, a1); change_argument(a1.basic_type(), arg_slot, a2); break; } case java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS: { int dest_arg_slot = chain().adapter_conversion_vminfo(); if (!has_argument(dest_arg_slot) || arg_slot == dest_arg_slot) { lose("bad rotate index", CHECK_(empty)); } // Rotate the source argument (plus following N slots) into the // position occupied by the dest argument (plus following N slots). int rotate_count = type2size[chain().adapter_conversion_src_type()]; // (no other rotate counts are currently supported) if (arg_slot < dest_arg_slot) { for (int i = 0; i < rotate_count; i++) { ArgToken temp = _outgoing.at(arg_slot); _outgoing.remove_at(arg_slot); _outgoing.insert_before(dest_arg_slot + rotate_count - 1, temp); } } else { // arg_slot > dest_arg_slot for (int i = 0; i < rotate_count; i++) { ArgToken temp = _outgoing.at(arg_slot + rotate_count - 1); _outgoing.remove_at(arg_slot + rotate_count - 1); _outgoing.insert_before(dest_arg_slot, temp); } } assert(_outgoing_argc == argument_count_slow(), "empty slots under control"); break; } case java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS: { int dup_slots = chain().adapter_conversion_stack_pushes(); if (dup_slots <= 0) { lose("bad dup count", CHECK_(empty)); } for (int i = 0; i < dup_slots; i++) { ArgToken dup = _outgoing.at(arg_slot + 2*i); // XXX should this be a dynamic check? // if (dup == NULL) break; // safety net if (dup.basic_type() != T_VOID) _outgoing_argc += 1; _outgoing.insert_before(i, dup); } assert(_outgoing_argc == argument_count_slow(), "empty slots under control"); break; } case java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS: { int drop_slots = -chain().adapter_conversion_stack_pushes(); if (drop_slots <= 0) { lose("bad drop count", CHECK_(empty)); } for (int i = 0; i < drop_slots; i++) { ArgToken drop = _outgoing.at(arg_slot); // XXX should this be a dynamic check? // if (drop == NULL) break; // safety net if (drop.basic_type() != T_VOID) _outgoing_argc -= 1; _outgoing.remove_at(arg_slot); } assert(_outgoing_argc == argument_count_slow(), "empty slots under control"); break; } case java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS: retain_original_args = true; // and fall through: case java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS: { // call argument MH recursively //{static int x; if (!x++) print_method_handle(chain().method_handle_oop()); --x;} Handle recursive_mh(THREAD, chain().adapter_arg_oop()); if (!java_lang_invoke_MethodHandle::is_instance(recursive_mh())) { lose("recursive target not a MethodHandle", CHECK_(empty)); } Handle recursive_mtype(THREAD, java_lang_invoke_MethodHandle::type(recursive_mh())); int argc = java_lang_invoke_MethodType::ptype_count(recursive_mtype()); int coll_slots = java_lang_invoke_MethodHandle::vmslots(recursive_mh()); BasicType rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(recursive_mtype())); ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, 1 + argc + 1); // 1+: mh, +1: sentinel arglist[0] = make_oop_constant(recursive_mh(), CHECK_(empty)); if (arg_slot < 0 || coll_slots < 0 || arg_slot + coll_slots > _outgoing.length()) { lose("bad fold/collect arg slot", CHECK_(empty)); } for (int i = 0, slot = arg_slot + coll_slots - 1; slot >= arg_slot; slot--) { ArgToken arg_state = _outgoing.at(slot); BasicType arg_type = arg_state.basic_type(); if (arg_type == T_VOID) continue; ArgToken arg = _outgoing.at(slot); if (i >= argc) { lose("bad fold/collect arg", CHECK_(empty)); } arglist[1+i] = arg; if (!retain_original_args) change_argument(arg_type, slot, T_VOID, ArgToken(tt_void)); i++; } arglist[1+argc] = ArgToken(); // sentinel oop invoker = java_lang_invoke_MethodTypeForm::vmlayout( java_lang_invoke_MethodType::form(recursive_mtype()) ); if (invoker == NULL || !invoker->is_method()) { lose("bad vmlayout slot", CHECK_(empty)); } // FIXME: consider inlining the invokee at the bytecode level ArgToken ret = make_invoke(methodOop(invoker), vmIntrinsics::_none, Bytecodes::_invokevirtual, false, 1+argc, &arglist[0], CHECK_(empty)); DEBUG_ONLY(invoker = NULL); if (rtype == T_OBJECT) { klassOop rklass = java_lang_Class::as_klassOop( java_lang_invoke_MethodType::rtype(recursive_mtype()) ); if (rklass != SystemDictionary::Object_klass() && !Klass::cast(rklass)->is_interface()) { // preserve type safety ret = make_conversion(T_OBJECT, rklass, Bytecodes::_checkcast, ret, CHECK_(empty)); } } if (rtype != T_VOID) { int ret_slot = arg_slot + (retain_original_args ? coll_slots : 0); change_argument(T_VOID, ret_slot, rtype, ret); } break; } case java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS: { klassOop array_klass_oop = NULL; BasicType array_type = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &array_klass_oop); assert(array_type == T_OBJECT, ""); assert(Klass::cast(array_klass_oop)->oop_is_array(), ""); arrayKlassHandle array_klass(THREAD, array_klass_oop); debug_only(array_klass_oop = (klassOop)badOop); klassOop element_klass_oop = NULL; BasicType element_type = java_lang_Class::as_BasicType(array_klass->component_mirror(), &element_klass_oop); KlassHandle element_klass(THREAD, element_klass_oop); debug_only(element_klass_oop = (klassOop)badOop); // Fetch the argument, which we will cast to the required array type. ArgToken arg = _outgoing.at(arg_slot); assert(arg.basic_type() == T_OBJECT, ""); ArgToken array_arg = arg; array_arg = make_conversion(T_OBJECT, array_klass(), Bytecodes::_checkcast, array_arg, CHECK_(empty)); change_argument(T_OBJECT, arg_slot, T_VOID, ArgToken(tt_void)); // Check the required length. int spread_slots = 1 + chain().adapter_conversion_stack_pushes(); int spread_length = spread_slots; if (type2size[element_type] == 2) { if (spread_slots % 2 != 0) spread_slots = -1; // force error spread_length = spread_slots / 2; } if (spread_slots < 0) { lose("bad spread length", CHECK_(empty)); } jvalue length_jvalue; length_jvalue.i = spread_length; ArgToken length_arg = make_prim_constant(T_INT, &length_jvalue, CHECK_(empty)); // Call a built-in method known to the JVM to validate the length. ArgToken arglist[3]; arglist[0] = array_arg; // value to check arglist[1] = length_arg; // length to check arglist[2] = ArgToken(); // sentinel make_invoke(NULL, vmIntrinsics::_checkSpreadArgument, Bytecodes::_invokestatic, false, 2, &arglist[0], CHECK_(empty)); // Spread out the array elements. Bytecodes::Code aload_op = Bytecodes::_nop; switch (element_type) { case T_INT: aload_op = Bytecodes::_iaload; break; case T_LONG: aload_op = Bytecodes::_laload; break; case T_FLOAT: aload_op = Bytecodes::_faload; break; case T_DOUBLE: aload_op = Bytecodes::_daload; break; case T_OBJECT: aload_op = Bytecodes::_aaload; break; case T_BOOLEAN: // fall through: case T_BYTE: aload_op = Bytecodes::_baload; break; case T_CHAR: aload_op = Bytecodes::_caload; break; case T_SHORT: aload_op = Bytecodes::_saload; break; default: lose("primitive array NYI", CHECK_(empty)); } int ap = arg_slot; for (int i = 0; i < spread_length; i++) { jvalue offset_jvalue; offset_jvalue.i = i; ArgToken offset_arg = make_prim_constant(T_INT, &offset_jvalue, CHECK_(empty)); ArgToken element_arg = make_fetch(element_type, element_klass(), aload_op, array_arg, offset_arg, CHECK_(empty)); change_argument(T_VOID, ap, element_type, element_arg); ap += type2size[element_type]; } break; } default: lose("bad adapter conversion", CHECK_(empty)); break; } } if (chain().is_bound()) { // push a new argument BasicType arg_type = chain().bound_arg_type(); jint arg_slot = chain().bound_arg_slot(); oop arg_oop = chain().bound_arg_oop(); ArgToken arg; if (arg_type == T_OBJECT) { arg = make_oop_constant(arg_oop, CHECK_(empty)); } else { jvalue arg_value; BasicType bt = java_lang_boxing_object::get_value(arg_oop, &arg_value); if (bt == arg_type || (bt == T_INT && is_subword_type(arg_type))) { arg = make_prim_constant(arg_type, &arg_value, CHECK_(empty)); } else { lose(err_msg("bad bound value: arg_type %s boxing %s", type2name(arg_type), type2name(bt)), CHECK_(empty)); } } DEBUG_ONLY(arg_oop = badOop); change_argument(T_VOID, arg_slot, arg_type, arg); } // this test must come after the body of the loop if (!chain().is_last()) { chain().next(CHECK_(empty)); } else { break; } } // finish the sequence with a tail-call to the ultimate target // parameters are passed in logical order (recv 1st), not slot order ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, _outgoing.length() + 1); int ap = 0; for (int i = _outgoing.length() - 1; i >= 0; i--) { ArgToken arg_state = _outgoing.at(i); if (arg_state.basic_type() == T_VOID) continue; arglist[ap++] = _outgoing.at(i); } assert(ap == _outgoing_argc, ""); arglist[ap] = ArgToken(); // add a sentinel, for the sake of asserts return make_invoke(chain().last_method_oop(), vmIntrinsics::_none, chain().last_invoke_code(), true, ap, arglist, THREAD); } // ----------------------------------------------------------------------------- // MethodHandleWalker::walk_incoming_state // void MethodHandleWalker::walk_incoming_state(TRAPS) { Handle mtype(THREAD, chain().method_type_oop()); int nptypes = java_lang_invoke_MethodType::ptype_count(mtype()); _outgoing_argc = nptypes; int argp = nptypes - 1; if (argp >= 0) { _outgoing.at_grow(argp, ArgToken(tt_void)); // presize } for (int i = 0; i < nptypes; i++) { klassOop arg_type_klass = NULL; BasicType arg_type = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(mtype(), i), &arg_type_klass); int index = new_local_index(arg_type); ArgToken arg = make_parameter(arg_type, arg_type_klass, index, CHECK); DEBUG_ONLY(arg_type_klass = (klassOop) NULL); _outgoing.at_put(argp, arg); if (type2size[arg_type] == 2) { // add the extra slot, so we can model the JVM stack _outgoing.insert_before(argp+1, ArgToken(tt_void)); } --argp; } // call make_parameter at the end of the list for the return type klassOop ret_type_klass = NULL; BasicType ret_type = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(mtype()), &ret_type_klass); ArgToken ret = make_parameter(ret_type, ret_type_klass, -1, CHECK); // ignore ret; client can catch it if needed assert(_outgoing_argc == argument_count_slow(), "empty slots under control"); verify_args_and_signature(CHECK); } #ifdef ASSERT void MethodHandleWalker::verify_args_and_signature(TRAPS) { int index = _outgoing.length() - 1; objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(chain().method_type_oop()); for (int i = 0, limit = ptypes->length(); i < limit; i++) { BasicType t = java_lang_Class::as_BasicType(ptypes->obj_at(i)); if (t == T_ARRAY) t = T_OBJECT; if (t == T_LONG || t == T_DOUBLE) { assert(T_VOID == _outgoing.at(index).basic_type(), "types must match"); index--; } assert(t == _outgoing.at(index).basic_type(), "types must match"); index--; } } #endif // ----------------------------------------------------------------------------- // MethodHandleWalker::change_argument // // This is messy because some kinds of arguments are paired with // companion slots containing an empty value. void MethodHandleWalker::change_argument(BasicType old_type, int slot, const ArgToken& new_arg) { BasicType new_type = new_arg.basic_type(); int old_size = type2size[old_type]; int new_size = type2size[new_type]; if (old_size == new_size) { // simple case first _outgoing.at_put(slot, new_arg); } else if (old_size > new_size) { for (int i = old_size - 1; i >= new_size; i--) { assert((i != 0) == (_outgoing.at(slot + i).basic_type() == T_VOID), ""); _outgoing.remove_at(slot + i); } if (new_size > 0) _outgoing.at_put(slot, new_arg); else _outgoing_argc -= 1; // deleted a real argument } else { for (int i = old_size; i < new_size; i++) { _outgoing.insert_before(slot + i, ArgToken(tt_void)); } _outgoing.at_put(slot, new_arg); if (old_size == 0) _outgoing_argc += 1; // inserted a real argument } assert(_outgoing_argc == argument_count_slow(), "empty slots under control"); } #ifdef ASSERT int MethodHandleWalker::argument_count_slow() { int args_seen = 0; for (int i = _outgoing.length() - 1; i >= 0; i--) { if (_outgoing.at(i).basic_type() != T_VOID) { ++args_seen; if (_outgoing.at(i).basic_type() == T_LONG || _outgoing.at(i).basic_type() == T_DOUBLE) { assert(_outgoing.at(i + 1).basic_type() == T_VOID, "should only follow two word"); } } else { assert(_outgoing.at(i - 1).basic_type() == T_LONG || _outgoing.at(i - 1).basic_type() == T_DOUBLE, "should only follow two word"); } } return args_seen; } #endif // ----------------------------------------------------------------------------- // MethodHandleWalker::retype_raw_conversion // // Do the raw retype conversions for OP_RETYPE_RAW. void MethodHandleWalker::retype_raw_conversion(BasicType src, BasicType dst, bool for_return, int slot, TRAPS) { if (src != dst) { if (MethodHandles::same_basic_type_for_returns(src, dst, /*raw*/ true)) { if (MethodHandles::is_float_fixed_reinterpretation_cast(src, dst)) { if (for_return) Untested("MHW return raw conversion"); // still untested vmIntrinsics::ID iid = vmIntrinsics::for_raw_conversion(src, dst); if (iid == vmIntrinsics::_none) { lose("no raw conversion method", CHECK); } ArgToken arglist[2]; if (!for_return) { // argument type conversion ArgToken arg = _outgoing.at(slot); assert(arg.token_type() >= tt_symbolic || src == arg.basic_type(), "sanity"); arglist[0] = arg; // outgoing 'this' arglist[1] = ArgToken(); // sentinel arg = make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK); change_argument(src, slot, dst, arg); } else { // return type conversion klassOop arg_klass = NULL; arglist[0] = make_parameter(src, arg_klass, -1, CHECK); // return value arglist[1] = ArgToken(); // sentinel (void) make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK); } } else { // Nothing to do. } } else if (src == T_OBJECT && is_java_primitive(dst)) { // ref-to-prim: discard ref, push zero lose("requested ref-to-prim conversion not expected", CHECK); } else { lose(err_msg("requested raw conversion not allowed: %s -> %s", type2name(src), type2name(dst)), CHECK); } } } // ----------------------------------------------------------------------------- // MethodHandleCompiler MethodHandleCompiler::MethodHandleCompiler(Handle root, Symbol* name, Symbol* signature, int invoke_count, bool is_invokedynamic, TRAPS) : MethodHandleWalker(root, is_invokedynamic, THREAD), _invoke_count(invoke_count), _thread(THREAD), _bytecode(THREAD, 50), _constants(THREAD, 10), _cur_stack(0), _max_stack(0), _rtype(T_ILLEGAL) { // Element zero is always the null constant. (void) _constants.append(NULL); // Set name and signature index. _name_index = cpool_symbol_put(name); _signature_index = cpool_symbol_put(signature); // Get return type klass. Handle first_mtype(THREAD, chain().method_type_oop()); // _rklass is NULL for primitives. _rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(first_mtype()), &_rklass); if (_rtype == T_ARRAY) _rtype = T_OBJECT; ArgumentSizeComputer args(signature); int params = args.size() + 1; // Incoming arguments plus receiver. _num_params = for_invokedynamic() ? params - 1 : params; // XXX Check if callee is static? } // ----------------------------------------------------------------------------- // MethodHandleCompiler::compile // // Compile this MethodHandle into a bytecode adapter and return a // methodOop. methodHandle MethodHandleCompiler::compile(TRAPS) { assert(_thread == THREAD, "must be same thread"); methodHandle nullHandle; (void) walk(CHECK_(nullHandle)); return get_method_oop(CHECK_(nullHandle)); } void MethodHandleCompiler::emit_bc(Bytecodes::Code op, int index, int args_size) { Bytecodes::check(op); // Are we legal? switch (op) { // b case Bytecodes::_aconst_null: case Bytecodes::_iconst_m1: case Bytecodes::_iconst_0: case Bytecodes::_iconst_1: case Bytecodes::_iconst_2: case Bytecodes::_iconst_3: case Bytecodes::_iconst_4: case Bytecodes::_iconst_5: case Bytecodes::_lconst_0: case Bytecodes::_lconst_1: case Bytecodes::_fconst_0: case Bytecodes::_fconst_1: case Bytecodes::_fconst_2: case Bytecodes::_dconst_0: case Bytecodes::_dconst_1: case Bytecodes::_iload_0: case Bytecodes::_iload_1: case Bytecodes::_iload_2: case Bytecodes::_iload_3: case Bytecodes::_lload_0: case Bytecodes::_lload_1: case Bytecodes::_lload_2: case Bytecodes::_lload_3: case Bytecodes::_fload_0: case Bytecodes::_fload_1: case Bytecodes::_fload_2: case Bytecodes::_fload_3: case Bytecodes::_dload_0: case Bytecodes::_dload_1: case Bytecodes::_dload_2: case Bytecodes::_dload_3: case Bytecodes::_aload_0: case Bytecodes::_aload_1: case Bytecodes::_aload_2: case Bytecodes::_aload_3: case Bytecodes::_istore_0: case Bytecodes::_istore_1: case Bytecodes::_istore_2: case Bytecodes::_istore_3: case Bytecodes::_lstore_0: case Bytecodes::_lstore_1: case Bytecodes::_lstore_2: case Bytecodes::_lstore_3: case Bytecodes::_fstore_0: case Bytecodes::_fstore_1: case Bytecodes::_fstore_2: case Bytecodes::_fstore_3: case Bytecodes::_dstore_0: case Bytecodes::_dstore_1: case Bytecodes::_dstore_2: case Bytecodes::_dstore_3: case Bytecodes::_astore_0: case Bytecodes::_astore_1: case Bytecodes::_astore_2: case Bytecodes::_astore_3: case Bytecodes::_iand: case Bytecodes::_i2l: case Bytecodes::_i2f: case Bytecodes::_i2d: case Bytecodes::_i2b: case Bytecodes::_i2c: case Bytecodes::_i2s: case Bytecodes::_l2i: case Bytecodes::_l2f: case Bytecodes::_l2d: case Bytecodes::_f2i: case Bytecodes::_f2l: case Bytecodes::_f2d: case Bytecodes::_d2i: case Bytecodes::_d2l: case Bytecodes::_d2f: case Bytecodes::_iaload: case Bytecodes::_laload: case Bytecodes::_faload: case Bytecodes::_daload: case Bytecodes::_aaload: case Bytecodes::_baload: case Bytecodes::_caload: case Bytecodes::_saload: case Bytecodes::_ireturn: case Bytecodes::_lreturn: case Bytecodes::_freturn: case Bytecodes::_dreturn: case Bytecodes::_areturn: case Bytecodes::_return: assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_b, "wrong bytecode format"); _bytecode.push(op); break; // bi case Bytecodes::_ldc: assert(Bytecodes::format_bits(op, false) == (Bytecodes::_fmt_b|Bytecodes::_fmt_has_k), "wrong bytecode format"); if (index == (index & 0xff)) { _bytecode.push(op); _bytecode.push(index); } else { _bytecode.push(Bytecodes::_ldc_w); _bytecode.push(index >> 8); _bytecode.push(index); } break; case Bytecodes::_iload: case Bytecodes::_lload: case Bytecodes::_fload: case Bytecodes::_dload: case Bytecodes::_aload: case Bytecodes::_istore: case Bytecodes::_lstore: case Bytecodes::_fstore: case Bytecodes::_dstore: case Bytecodes::_astore: assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bi, "wrong bytecode format"); if (index == (index & 0xff)) { _bytecode.push(op); _bytecode.push(index); } else { // doesn't fit in a u2 _bytecode.push(Bytecodes::_wide); _bytecode.push(op); _bytecode.push(index >> 8); _bytecode.push(index); } break; // bkk case Bytecodes::_ldc_w: case Bytecodes::_ldc2_w: case Bytecodes::_checkcast: assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bkk, "wrong bytecode format"); assert((unsigned short) index == index, "index does not fit in 16-bit"); _bytecode.push(op); _bytecode.push(index >> 8); _bytecode.push(index); break; // bJJ case Bytecodes::_invokestatic: case Bytecodes::_invokespecial: case Bytecodes::_invokevirtual: assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bJJ, "wrong bytecode format"); assert((unsigned short) index == index, "index does not fit in 16-bit"); _bytecode.push(op); _bytecode.push(index >> 8); _bytecode.push(index); break; case Bytecodes::_invokeinterface: assert(Bytecodes::format_bits(op, false) == Bytecodes::_fmt_bJJ, "wrong bytecode format"); assert((unsigned short) index == index, "index does not fit in 16-bit"); assert(args_size > 0, "valid args_size"); _bytecode.push(op); _bytecode.push(index >> 8); _bytecode.push(index); _bytecode.push(args_size); _bytecode.push(0); break; default: ShouldNotReachHere(); } } void MethodHandleCompiler::emit_load(BasicType bt, int index) { if (index <= 3) { switch (bt) { case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: emit_bc(Bytecodes::cast(Bytecodes::_iload_0 + index)); break; case T_LONG: emit_bc(Bytecodes::cast(Bytecodes::_lload_0 + index)); break; case T_FLOAT: emit_bc(Bytecodes::cast(Bytecodes::_fload_0 + index)); break; case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dload_0 + index)); break; case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_aload_0 + index)); break; default: ShouldNotReachHere(); } } else { switch (bt) { case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: emit_bc(Bytecodes::_iload, index); break; case T_LONG: emit_bc(Bytecodes::_lload, index); break; case T_FLOAT: emit_bc(Bytecodes::_fload, index); break; case T_DOUBLE: emit_bc(Bytecodes::_dload, index); break; case T_OBJECT: emit_bc(Bytecodes::_aload, index); break; default: ShouldNotReachHere(); } } stack_push(bt); } void MethodHandleCompiler::emit_store(BasicType bt, int index) { if (index <= 3) { switch (bt) { case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: emit_bc(Bytecodes::cast(Bytecodes::_istore_0 + index)); break; case T_LONG: emit_bc(Bytecodes::cast(Bytecodes::_lstore_0 + index)); break; case T_FLOAT: emit_bc(Bytecodes::cast(Bytecodes::_fstore_0 + index)); break; case T_DOUBLE: emit_bc(Bytecodes::cast(Bytecodes::_dstore_0 + index)); break; case T_OBJECT: emit_bc(Bytecodes::cast(Bytecodes::_astore_0 + index)); break; default: ShouldNotReachHere(); } } else { switch (bt) { case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: emit_bc(Bytecodes::_istore, index); break; case T_LONG: emit_bc(Bytecodes::_lstore, index); break; case T_FLOAT: emit_bc(Bytecodes::_fstore, index); break; case T_DOUBLE: emit_bc(Bytecodes::_dstore, index); break; case T_OBJECT: emit_bc(Bytecodes::_astore, index); break; default: ShouldNotReachHere(); } } stack_pop(bt); } void MethodHandleCompiler::emit_load_constant(ArgToken arg) { BasicType bt = arg.basic_type(); if (is_subword_type(bt)) bt = T_INT; switch (bt) { case T_INT: { jint value = arg.get_jint(); if (-1 <= value && value <= 5) emit_bc(Bytecodes::cast(Bytecodes::_iconst_0 + value)); else emit_bc(Bytecodes::_ldc, cpool_int_put(value)); break; } case T_LONG: { jlong value = arg.get_jlong(); if (0 <= value && value <= 1) emit_bc(Bytecodes::cast(Bytecodes::_lconst_0 + (int) value)); else emit_bc(Bytecodes::_ldc2_w, cpool_long_put(value)); break; } case T_FLOAT: { jfloat value = arg.get_jfloat(); if (value == 0.0 || value == 1.0 || value == 2.0) emit_bc(Bytecodes::cast(Bytecodes::_fconst_0 + (int) value)); else emit_bc(Bytecodes::_ldc, cpool_float_put(value)); break; } case T_DOUBLE: { jdouble value = arg.get_jdouble(); if (value == 0.0 || value == 1.0) emit_bc(Bytecodes::cast(Bytecodes::_dconst_0 + (int) value)); else emit_bc(Bytecodes::_ldc2_w, cpool_double_put(value)); break; } case T_OBJECT: { Handle value = arg.object(); if (value.is_null()) emit_bc(Bytecodes::_aconst_null); else emit_bc(Bytecodes::_ldc, cpool_object_put(value)); break; } default: ShouldNotReachHere(); } stack_push(bt); } MethodHandleWalker::ArgToken MethodHandleCompiler::make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS) { BasicType srctype = src.basic_type(); TokenType tt = src.token_type(); int index = -1; switch (op) { case Bytecodes::_i2l: case Bytecodes::_i2f: case Bytecodes::_i2d: case Bytecodes::_i2b: case Bytecodes::_i2c: case Bytecodes::_i2s: case Bytecodes::_l2i: case Bytecodes::_l2f: case Bytecodes::_l2d: case Bytecodes::_f2i: case Bytecodes::_f2l: case Bytecodes::_f2d: case Bytecodes::_d2i: case Bytecodes::_d2l: case Bytecodes::_d2f: if (tt == tt_constant) { emit_load_constant(src); } else { emit_load(srctype, src.index()); } stack_pop(srctype); // pop the src type emit_bc(op); stack_push(type); // push the dest value if (tt != tt_constant) index = src.index(); if (srctype != type || index == -1) index = new_local_index(type); emit_store(type, index); break; case Bytecodes::_checkcast: if (tt == tt_constant) { emit_load_constant(src); } else { emit_load(srctype, src.index()); index = src.index(); } emit_bc(op, cpool_klass_put(tk)); if (index == -1) index = new_local_index(type); emit_store(srctype, index); break; case Bytecodes::_nop: // nothing to do assert(type == src.basic_type(), "must agree"); return src; default: if (op == Bytecodes::_illegal) lose(err_msg("no such primitive conversion: %s -> %s", type2name(src.basic_type()), type2name(type)), THREAD); else lose(err_msg("bad primitive conversion op: %s", Bytecodes::name(op)), THREAD); return make_prim_constant(type, &zero_jvalue, THREAD); } return make_parameter(type, tk, index, THREAD); } // ----------------------------------------------------------------------------- // MethodHandleCompiler // // Values used by the compiler. jvalue MethodHandleCompiler::zero_jvalue = { 0 }; jvalue MethodHandleCompiler::one_jvalue = { 1 }; // Emit bytecodes for the given invoke instruction. MethodHandleWalker::ArgToken MethodHandleCompiler::make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, MethodHandleWalker::ArgToken* argv, TRAPS) { ArgToken zero; if (m == NULL) { // Get the intrinsic methodOop. m = vmIntrinsics::method_for(iid); if (m == NULL) { lose(vmIntrinsics::name_at(iid), CHECK_(zero)); } } klassOop klass = m->method_holder(); Symbol* name = m->name(); Symbol* signature = m->signature(); // Count the number of arguments, not the size ArgumentCount asc(signature); assert(argc == asc.size() + ((op == Bytecodes::_invokestatic || op == Bytecodes::_invokedynamic) ? 0 : 1), "argc mismatch"); if (tailcall) { // Actually, in order to make these methods more recognizable, // let's put them in holder class MethodHandle. That way stack // walkers and compiler heuristics can recognize them. _target_klass = SystemDictionary::MethodHandle_klass(); } // Inline the method. InvocationCounter* ic = m->invocation_counter(); ic->set_carry_flag(); for (int i = 0; i < argc; i++) { ArgToken arg = argv[i]; TokenType tt = arg.token_type(); BasicType bt = arg.basic_type(); switch (tt) { case tt_parameter: case tt_temporary: emit_load(bt, arg.index()); break; case tt_constant: emit_load_constant(arg); break; case tt_illegal: // Sentinel. assert(i == (argc - 1), "sentinel must be last entry"); break; case tt_void: default: ShouldNotReachHere(); } } // Populate constant pool. int name_index = cpool_symbol_put(name); int signature_index = cpool_symbol_put(signature); int name_and_type_index = cpool_name_and_type_put(name_index, signature_index); int klass_index = cpool_klass_put(klass); int methodref_index = cpool_methodref_put(klass_index, name_and_type_index); // Generate invoke. switch (op) { case Bytecodes::_invokestatic: case Bytecodes::_invokespecial: case Bytecodes::_invokevirtual: emit_bc(op, methodref_index); break; case Bytecodes::_invokeinterface: { ArgumentSizeComputer asc(signature); emit_bc(op, methodref_index, asc.size() + 1); break; } default: ShouldNotReachHere(); } // If tailcall, we have walked all the way to a direct method handle. // Otherwise, make a recursive call to some helper routine. BasicType rbt = m->result_type(); if (rbt == T_ARRAY) rbt = T_OBJECT; stack_push(rbt); // The return value is already pushed onto the stack. ArgToken ret; if (tailcall) { if (rbt != _rtype) { if (rbt == T_VOID) { // push a zero of the right sort if (_rtype == T_OBJECT) { zero = make_oop_constant(NULL, CHECK_(zero)); } else { zero = make_prim_constant(_rtype, &zero_jvalue, CHECK_(zero)); } emit_load_constant(zero); } else if (_rtype == T_VOID) { // We'll emit a _return with something on the stack. // It's OK to ignore what's on the stack. } else if (rbt == T_INT && is_subword_type(_rtype)) { // Convert value to match return type. switch (_rtype) { case T_BOOLEAN: { // boolean is treated as a one-bit unsigned integer. // Cf. API documentation: java/lang/invoke/MethodHandles.html#explicitCastArguments ArgToken one = make_prim_constant(T_INT, &one_jvalue, CHECK_(zero)); emit_load_constant(one); emit_bc(Bytecodes::_iand); break; } case T_BYTE: emit_bc(Bytecodes::_i2b); break; case T_CHAR: emit_bc(Bytecodes::_i2c); break; case T_SHORT: emit_bc(Bytecodes::_i2s); break; default: ShouldNotReachHere(); } } else if (is_subword_type(rbt) && (is_subword_type(_rtype) || (_rtype == T_INT))) { // The subword type was returned as an int and will be passed // on as an int. } else { lose("unknown conversion", CHECK_(zero)); } } switch (_rtype) { case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: emit_bc(Bytecodes::_ireturn); break; case T_LONG: emit_bc(Bytecodes::_lreturn); break; case T_FLOAT: emit_bc(Bytecodes::_freturn); break; case T_DOUBLE: emit_bc(Bytecodes::_dreturn); break; case T_VOID: emit_bc(Bytecodes::_return); break; case T_OBJECT: if (_rklass.not_null() && _rklass() != SystemDictionary::Object_klass()) emit_bc(Bytecodes::_checkcast, cpool_klass_put(_rklass())); emit_bc(Bytecodes::_areturn); break; default: ShouldNotReachHere(); } ret = ArgToken(); // Dummy return value. } else { int index = new_local_index(rbt); switch (rbt) { case T_BOOLEAN: case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: case T_LONG: case T_FLOAT: case T_DOUBLE: case T_OBJECT: emit_store(rbt, index); ret = ArgToken(tt_temporary, rbt, index); break; case T_VOID: ret = ArgToken(tt_void); break; default: ShouldNotReachHere(); } } return ret; } MethodHandleWalker::ArgToken MethodHandleCompiler::make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const MethodHandleWalker::ArgToken& base, const MethodHandleWalker::ArgToken& offset, TRAPS) { switch (base.token_type()) { case tt_parameter: case tt_temporary: emit_load(base.basic_type(), base.index()); break; case tt_constant: emit_load_constant(base); break; default: ShouldNotReachHere(); } switch (offset.token_type()) { case tt_parameter: case tt_temporary: emit_load(offset.basic_type(), offset.index()); break; case tt_constant: emit_load_constant(offset); break; default: ShouldNotReachHere(); } emit_bc(op); int index = new_local_index(type); emit_store(type, index); return ArgToken(tt_temporary, type, index); } int MethodHandleCompiler::cpool_primitive_put(BasicType bt, jvalue* con) { jvalue con_copy; assert(bt < T_OBJECT, ""); if (type2aelembytes(bt) < jintSize) { // widen to int con_copy = (*con); con = &con_copy; switch (bt) { case T_BOOLEAN: con->i = (con->z ? 1 : 0); break; case T_BYTE: con->i = con->b; break; case T_CHAR: con->i = con->c; break; case T_SHORT: con->i = con->s; break; default: ShouldNotReachHere(); } bt = T_INT; } // for (int i = 1, imax = _constants.length(); i < imax; i++) { // ConstantValue* con = _constants.at(i); // if (con != NULL && con->is_primitive() && con.basic_type() == bt) { // bool match = false; // switch (type2size[bt]) { // case 1: if (pcon->_value.i == con->i) match = true; break; // case 2: if (pcon->_value.j == con->j) match = true; break; // } // if (match) // return i; // } // } ConstantValue* cv = new ConstantValue(bt, *con); int index = _constants.append(cv); // long and double entries take 2 slots, we add another empty entry. if (type2size[bt] == 2) (void) _constants.append(NULL); return index; } constantPoolHandle MethodHandleCompiler::get_constant_pool(TRAPS) const { constantPoolHandle nullHandle; constantPoolOop cpool_oop = oopFactory::new_constantPool(_constants.length(), oopDesc::IsSafeConc, CHECK_(nullHandle)); constantPoolHandle cpool(THREAD, cpool_oop); // Fill the real constant pool skipping the zero element. for (int i = 1; i < _constants.length(); i++) { ConstantValue* cv = _constants.at(i); switch (cv->tag()) { case JVM_CONSTANT_Utf8: cpool->symbol_at_put( i, cv->symbol() ); break; case JVM_CONSTANT_Integer: cpool->int_at_put( i, cv->get_jint() ); break; case JVM_CONSTANT_Float: cpool->float_at_put( i, cv->get_jfloat() ); break; case JVM_CONSTANT_Long: cpool->long_at_put( i, cv->get_jlong() ); break; case JVM_CONSTANT_Double: cpool->double_at_put( i, cv->get_jdouble() ); break; case JVM_CONSTANT_Class: cpool->klass_at_put( i, cv->klass_oop() ); break; case JVM_CONSTANT_Methodref: cpool->method_at_put( i, cv->first_index(), cv->second_index()); break; case JVM_CONSTANT_NameAndType: cpool->name_and_type_at_put(i, cv->first_index(), cv->second_index()); break; case JVM_CONSTANT_Object: cpool->object_at_put( i, cv->object_oop() ); break; default: ShouldNotReachHere(); } switch (cv->tag()) { case JVM_CONSTANT_Long: case JVM_CONSTANT_Double: i++; // Skip empty entry. assert(_constants.at(i) == NULL, "empty entry"); break; } } // Set the constant pool holder to the target method's class. cpool->set_pool_holder(_target_klass()); return cpool; } methodHandle MethodHandleCompiler::get_method_oop(TRAPS) const { methodHandle empty; // Create a method that holds the generated bytecode. invokedynamic // has no receiver, normal MH calls do. int flags_bits; if (for_invokedynamic()) flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_SYNTHETIC | JVM_ACC_STATIC); else flags_bits = (/*JVM_MH_INVOKE_BITS |*/ JVM_ACC_PUBLIC | JVM_ACC_FINAL | JVM_ACC_SYNTHETIC); // Create a new method methodHandle m; { methodOop m_oop = oopFactory::new_method(bytecode_length(), accessFlags_from(flags_bits), 0, 0, 0, oopDesc::IsSafeConc, CHECK_(empty)); m = methodHandle(THREAD, m_oop); } constantPoolHandle cpool = get_constant_pool(CHECK_(empty)); m->set_constants(cpool()); m->set_name_index(_name_index); m->set_signature_index(_signature_index); m->set_code((address) bytecode()); m->set_max_stack(_max_stack); m->set_max_locals(max_locals()); m->set_size_of_parameters(_num_params); typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); m->set_exception_table(exception_handlers()); // Rewrite the method and set up the constant pool cache. objArrayOop m_array = oopFactory::new_system_objArray(1, CHECK_(empty)); objArrayHandle methods(THREAD, m_array); methods->obj_at_put(0, m()); Rewriter::rewrite(_target_klass(), cpool, methods, CHECK_(empty)); // Use fake class. // Set the invocation counter's count to the invoke count of the // original call site. InvocationCounter* ic = m->invocation_counter(); ic->set(InvocationCounter::wait_for_compile, _invoke_count); // Create a new MDO { methodDataOop mdo = oopFactory::new_methodData(m, CHECK_(empty)); assert(m->method_data() == NULL, "there should not be an MDO yet"); m->set_method_data(mdo); // Iterate over all profile data and set the count of the counter // data entries to the original call site counter. for (ProfileData* profile_data = mdo->first_data(); mdo->is_valid(profile_data); profile_data = mdo->next_data(profile_data)) { if (profile_data->is_CounterData()) { CounterData* counter_data = profile_data->as_CounterData(); counter_data->set_count(_invoke_count); } } } #ifndef PRODUCT if (TraceMethodHandles) { m->print(); m->print_codes(); } #endif //PRODUCT assert(m->is_method_handle_adapter(), "must be recognized as an adapter"); return m; } #ifndef PRODUCT // MH printer for debugging. class MethodHandlePrinter : public MethodHandleWalker { private: outputStream* _out; bool _verbose; int _temp_num; int _param_state; stringStream _strbuf; const char* strbuf() { const char* s = _strbuf.as_string(); _strbuf.reset(); return s; } ArgToken token(const char* str, BasicType type) { return ArgToken(str, type); } const char* string(ArgToken token) { return token.str(); } void start_params() { _param_state <<= 1; _out->print("("); } void end_params() { if (_verbose) _out->print("\n"); _out->print(") => {"); _param_state >>= 1; } void put_type_name(BasicType type, klassOop tk, outputStream* s) { const char* kname = NULL; if (tk != NULL) kname = Klass::cast(tk)->external_name(); s->print("%s", (kname != NULL) ? kname : type2name(type)); } ArgToken maybe_make_temp(const char* statement_op, BasicType type, const char* temp_name) { const char* value = strbuf(); if (!_verbose) return token(value, type); // make an explicit binding for each separate value _strbuf.print("%s%d", temp_name, ++_temp_num); const char* temp = strbuf(); _out->print("\n %s %s %s = %s;", statement_op, type2name(type), temp, value); return token(temp, type); } public: MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS) : MethodHandleWalker(root, false, THREAD), _out(out), _verbose(verbose), _param_state(0), _temp_num(0) { start_params(); } virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) { if (argnum < 0) { end_params(); return token("return", type); } if ((_param_state & 1) == 0) { _param_state |= 1; _out->print(_verbose ? "\n " : ""); } else { _out->print(_verbose ? ",\n " : ", "); } if (argnum >= _temp_num) _temp_num = argnum; // generate an argument name _strbuf.print("a%d", argnum); const char* arg = strbuf(); put_type_name(type, tk, _out); _out->print(" %s", arg); return token(arg, type); } virtual ArgToken make_oop_constant(oop con, TRAPS) { if (con == NULL) _strbuf.print("null"); else con->print_value_on(&_strbuf); if (_strbuf.size() == 0) { // yuck _strbuf.print("(a "); put_type_name(T_OBJECT, con->klass(), &_strbuf); _strbuf.print(")"); } return maybe_make_temp("constant", T_OBJECT, "k"); } virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) { java_lang_boxing_object::print(type, con, &_strbuf); return maybe_make_temp("constant", type, "k"); } void print_bytecode_name(Bytecodes::Code op) { if (Bytecodes::is_defined(op)) _strbuf.print("%s", Bytecodes::name(op)); else _strbuf.print("bytecode_%d", (int) op); } virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS) { print_bytecode_name(op); _strbuf.print("(%s", string(src)); if (tk != NULL) { _strbuf.print(", "); put_type_name(type, tk, &_strbuf); } _strbuf.print(")"); return maybe_make_temp("convert", type, "v"); } virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS) { _strbuf.print("%s(%s, %s", Bytecodes::name(op), string(base), string(offset)); if (tk != NULL) { _strbuf.print(", "); put_type_name(type, tk, &_strbuf); } _strbuf.print(")"); return maybe_make_temp("fetch", type, "x"); } virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS) { Symbol* name; Symbol* sig; if (m != NULL) { name = m->name(); sig = m->signature(); } else { name = vmSymbols::symbol_at(vmIntrinsics::name_for(iid)); sig = vmSymbols::symbol_at(vmIntrinsics::signature_for(iid)); } _strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string()); for (int i = 0; i < argc; i++) { _strbuf.print("%s%s", (i > 0 ? ", " : ""), string(argv[i])); } _strbuf.print(")"); if (!tailcall) { BasicType rt = char2type(sig->byte_at(sig->utf8_length()-1)); if (rt == T_ILLEGAL) rt = T_OBJECT; // ';' at the end of '(...)L...;' return maybe_make_temp("invoke", rt, "x"); } else { const char* ret = strbuf(); _out->print(_verbose ? "\n return " : " "); _out->print("%s", ret); _out->print(_verbose ? "\n}\n" : " }"); } return ArgToken(); } virtual void set_method_handle(oop mh) { if (WizardMode && Verbose) { tty->print("\n--- next target: "); mh->print(); } } static void print(Handle root, bool verbose, outputStream* out, TRAPS) { ResourceMark rm; MethodHandlePrinter printer(root, verbose, out, CHECK); printer.walk(CHECK); out->print("\n"); } static void print(Handle root, bool verbose = Verbose, outputStream* out = tty) { Thread* THREAD = Thread::current(); ResourceMark rm; MethodHandlePrinter printer(root, verbose, out, THREAD); if (!HAS_PENDING_EXCEPTION) printer.walk(THREAD); if (HAS_PENDING_EXCEPTION) { oop ex = PENDING_EXCEPTION; CLEAR_PENDING_EXCEPTION; out->print(" *** "); if (printer.lose_message() != NULL) out->print("%s ", printer.lose_message()); out->print("}"); } out->print("\n"); } }; extern "C" void print_method_handle(oop mh) { if (!mh->is_oop()) { tty->print_cr("*** not a method handle: "PTR_FORMAT, (intptr_t)mh); } else if (java_lang_invoke_MethodHandle::is_instance(mh)) { MethodHandlePrinter::print(mh); } else { tty->print("*** not a method handle: "); mh->print(); } } #endif // PRODUCT