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The Qbicc builder for the java.base JDK module
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/*
 * This code is based on OpenJDK source file(s) which contain the following copyright notice:
 *
 * ------
 * Copyright (c) 2021, 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
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 * ------
 *
 * This file may contain additional modifications which are Copyright (c) Red Hat and other
 * contributors.
 */

package jdk.internal.reflect;

import jdk.internal.vm.annotation.ForceInline;
import jdk.internal.vm.annotation.Hidden;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.WrongMethodTypeException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import org.qbicc.rt.annotation.Tracking;

import static jdk.internal.reflect.MethodHandleAccessorFactory.SPECIALIZED_PARAM_COUNT;

// This is a backport of OpenJDK 18 MethodHandle based reflection to JDK17 for Qbicc.
// It has been simplified by stripping out functionality we don't need.
// It should be removed when we update to the next LTS version of Java.
@Tracking("src/java.base/share/classes/jdk/internal/reflect/DirectConstructorHandleAccessor.java")
class DirectConstructorHandleAccessor extends ConstructorAccessorImpl {
    static ConstructorAccessorImpl constructorAccessor(Constructor ctor, MethodHandle target) {
        return new DirectConstructorHandleAccessor(ctor, target);
    }

    private static final int PARAM_COUNT_MASK = 0x00FF;
    private static final int NONZERO_BIT = 0x8000_0000;

    private final int paramFlags;
    private final MethodHandle target;

    DirectConstructorHandleAccessor(Constructor ctor, MethodHandle target) {
        this.paramFlags = (ctor.getParameterCount() & PARAM_COUNT_MASK) | NONZERO_BIT;
        this.target = target;
    }

    @Override
    public Object newInstance(Object[] args) throws InstantiationException, InvocationTargetException {
        int argc = args != null ? args.length : 0;
        // only check argument count for specialized forms
        int paramCount = paramFlags & PARAM_COUNT_MASK;
        if (paramCount <= SPECIALIZED_PARAM_COUNT && argc != paramCount) {
            throw new IllegalArgumentException("wrong number of arguments: " + argc + " expected: " + paramCount);
        }
        try {
            return invokeImpl(args);
        } catch (ClassCastException|WrongMethodTypeException e) {
            if (isIllegalArgument(e))
                throw new IllegalArgumentException("argument type mismatch", e);
            else
                throw new InvocationTargetException(e);
        } catch (NullPointerException e) {
            if (isIllegalArgument(e))
                throw new IllegalArgumentException(e);
            else
                throw new InvocationTargetException(e);
        } catch (Throwable e) {
            throw new InvocationTargetException(e);
        }
    }

    private boolean isIllegalArgument(RuntimeException ex) {
        return AccessorUtils.isIllegalArgument(DirectConstructorHandleAccessor.class, ex);
    }

    @Hidden
    @ForceInline
    Object invokeImpl(Object[] args) throws Throwable {
        return switch (paramFlags & PARAM_COUNT_MASK) {
            case 0 -> target.invokeExact();
            case 1 -> target.invokeExact(args[0]);
            case 2 -> target.invokeExact(args[0], args[1]);
            case 3 -> target.invokeExact(args[0], args[1], args[2]);
            default -> target.invokeExact(args);
        };
    }
}