src/java.base/share/classes/jdk/internal/classfile/impl/TerminalCodeBuilder.java

/*
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 * 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.
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package jdk.internal.classfile.impl;

import java.lang.classfile.CodeBuilder;
import java.lang.classfile.CodeModel;
import java.lang.classfile.attribute.CodeAttribute;

public sealed interface TerminalCodeBuilder extends CodeBuilder, LabelContext
        permits DirectCodeBuilder, BufferedCodeBuilder {
    int curTopLocal();

    static int setupTopLocal(MethodInfo methodInfo, CodeModel original) {
        int paramSlots = Util.maxLocals(methodInfo.methodFlags(), methodInfo.methodTypeSymbol());
        if (original == null) {
            return paramSlots;
        }
        if (original instanceof CodeAttribute attr) {
            return Math.max(paramSlots, attr.maxLocals());
        }
        if (original instanceof BufferedCodeBuilder.Model buffered) {
            return Math.max(paramSlots, buffered.curTopLocal());
        }
        throw new InternalError("Unknown code model " + original);
    }
}