| /* |
| * Copyright (c) 2014, 2019, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| package java.lang.invoke; |
| |
| import jdk.internal.vm.annotation.DontInline; |
| import jdk.internal.vm.annotation.ForceInline; |
| import jdk.internal.vm.annotation.Stable; |
| |
| import java.lang.invoke.VarHandle.AccessMode; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import static java.lang.invoke.MethodHandleNatives.Constants.REF_invokeStatic; |
| |
| /** |
| * A var handle form containing a set of member name, one for each operation. |
| * Each member characterizes a static method. |
| */ |
| final class VarForm { |
| |
| final Class<?> implClass; |
| |
| final @Stable MethodType[] methodType_table; |
| |
| final @Stable MemberName[] memberName_table; |
| |
| VarForm(Class<?> implClass, Class<?> receiver, Class<?> value, Class<?>... intermediate) { |
| this.methodType_table = new MethodType[VarHandle.AccessType.COUNT]; |
| this.memberName_table = new MemberName[VarHandle.AccessMode.COUNT]; |
| this.implClass = implClass; |
| if (receiver == null) { |
| initMethodTypes(value, intermediate); |
| } else { |
| Class<?>[] coordinates = new Class<?>[intermediate.length + 1]; |
| coordinates[0] = receiver; |
| System.arraycopy(intermediate, 0, coordinates, 1, intermediate.length); |
| initMethodTypes(value, coordinates); |
| } |
| } |
| |
| // Used by IndirectVarHandle |
| VarForm(Class<?> value, Class<?>[] coordinates) { |
| this.methodType_table = new MethodType[VarHandle.AccessType.COUNT]; |
| this.memberName_table = null; |
| this.implClass = null; |
| initMethodTypes(value, coordinates); |
| } |
| |
| void initMethodTypes(Class<?> value, Class<?>... coordinates) { |
| Class<?> erasedValue = MethodTypeForm.canonicalize(value, MethodTypeForm.ERASE); |
| Class<?>[] erasedCoordinates = MethodTypeForm.canonicalizeAll(coordinates, MethodTypeForm.ERASE); |
| |
| if (erasedValue != null) { |
| value = erasedValue; |
| } |
| if (erasedCoordinates != null) { |
| coordinates = erasedCoordinates; |
| } |
| |
| MethodType type = MethodType.methodType(value, coordinates); |
| |
| // (Receiver, <Intermediates>)Value |
| methodType_table[VarHandle.AccessType.GET.ordinal()] = type; |
| |
| // (Receiver, <Intermediates>, Value)Value |
| type = methodType_table[VarHandle.AccessType.GET_AND_UPDATE.ordinal()] = |
| type.appendParameterTypes(value); |
| |
| // (Receiver, <Intermediates>, Value)void |
| methodType_table[VarHandle.AccessType.SET.ordinal()] = type.changeReturnType(void.class); |
| |
| // (Receiver, <Intermediates>, Value, Value)Value |
| type = methodType_table[VarHandle.AccessType.COMPARE_AND_EXCHANGE.ordinal()] = |
| type.appendParameterTypes(value); |
| |
| // (Receiver, <Intermediates>, Value, Value)boolean |
| methodType_table[VarHandle.AccessType.COMPARE_AND_SET.ordinal()] = |
| type.changeReturnType(boolean.class); |
| } |
| |
| @ForceInline |
| final MethodType getMethodType(int type) { |
| return methodType_table[type]; |
| } |
| |
| @ForceInline |
| final MemberName getMemberName(int mode) { |
| MemberName mn = getMemberNameOrNull(mode); |
| if (mn == null) { |
| throw new UnsupportedOperationException(); |
| } |
| return mn; |
| } |
| |
| @ForceInline |
| final MemberName getMemberNameOrNull(int mode) { |
| MemberName mn = memberName_table[mode]; |
| if (mn == null) { |
| mn = resolveMemberName(mode); |
| } |
| return mn; |
| } |
| |
| @DontInline |
| MemberName resolveMemberName(int mode) { |
| AccessMode value = AccessMode.values()[mode]; |
| String methodName = value.methodName(); |
| MethodType type = methodType_table[value.at.ordinal()].insertParameterTypes(0, VarHandle.class); |
| return memberName_table[mode] = MethodHandles.Lookup.IMPL_LOOKUP |
| .resolveOrNull(REF_invokeStatic, implClass, methodName, type); |
| } |
| |
| @Stable |
| MethodType[] methodType_V_table; |
| |
| @ForceInline |
| final MethodType[] getMethodType_V_init() { |
| MethodType[] table = new MethodType[VarHandle.AccessType.values().length]; |
| for (int i = 0; i < methodType_table.length; i++) { |
| MethodType mt = methodType_table[i]; |
| // TODO only adjust for sig-poly methods returning Object |
| table[i] = mt.changeReturnType(void.class); |
| } |
| methodType_V_table = table; |
| return table; |
| } |
| |
| @ForceInline |
| final MethodType getMethodType_V(int type) { |
| MethodType[] table = methodType_V_table; |
| if (table == null) { |
| table = getMethodType_V_init(); |
| } |
| return table[type]; |
| } |
| } |