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

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * accompanied this code).
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package jdk.internal.classfile.impl;

import java.lang.classfile.constantpool.Utf8Entry;
import java.lang.constant.MethodTypeDesc;

import static java.lang.classfile.ClassFile.ACC_STATIC;

public sealed interface MethodInfo
        permits MethodImpl, TerminalMethodBuilder, BufferedMethodBuilder.Model {
    Utf8Entry methodName();
    Utf8Entry methodType();
    MethodTypeDesc methodTypeSymbol();
    int methodFlags();

    default int receiverSlot() {
        if ((methodFlags() & ACC_STATIC) != 0)
            throw new IllegalStateException("not an instance method");
        return 0;
    }

    int parameterSlot(int paramNo);
}