JDK 11 jdk.jdeps.jmod is the JMOD file for JDK 11 JDeps tool, which can be invoked by the "jdeps" command.

JDK 11 JDeps tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jdeps.jmod.

JDK 11 JDeps tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 JDeps tool source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jdeps.

You can click and view the content of each source code file in the list below.

⏎ com/sun/tools/classfile/Signature.java

/*
 * Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.tools.classfile;

import java.util.ArrayList;
import java.util.List;
import com.sun.tools.classfile.Type.*;

/**
 * See JVMS 4.4.4.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 */
public class Signature extends Descriptor {

    public Signature(int index) {
        super(index);
    }

    public Type getType(ConstantPool constant_pool) throws ConstantPoolException {
        if (type == null)
            type = parse(getValue(constant_pool));
        return type;
    }

    @Override
    public int getParameterCount(ConstantPool constant_pool) throws ConstantPoolException {
        MethodType m = (MethodType) getType(constant_pool);
        return m.paramTypes.size();
    }

    @Override
    public String getParameterTypes(ConstantPool constant_pool) throws ConstantPoolException {
        MethodType m = (MethodType) getType(constant_pool);
        StringBuilder sb = new StringBuilder();
        sb.append("(");
        String sep = "";
        for (Type paramType: m.paramTypes) {
            sb.append(sep);
            sb.append(paramType);
            sep = ", ";
        }
        sb.append(")");
        return sb.toString();
    }

    @Override
    public String getReturnType(ConstantPool constant_pool) throws ConstantPoolException {
        MethodType m = (MethodType) getType(constant_pool);
        return m.returnType.toString();
    }

    @Override
    public String getFieldType(ConstantPool constant_pool) throws ConstantPoolException {
        return getType(constant_pool).toString();
    }

    private Type parse(String sig) {
        this.sig = sig;
        sigp = 0;

        List<TypeParamType> typeParamTypes = null;
        if (sig.charAt(sigp) == '<')
            typeParamTypes = parseTypeParamTypes();

        if (sig.charAt(sigp) == '(') {
            List<Type> paramTypes = parseTypeSignatures(')');
            Type returnType = parseTypeSignature();
            List<Type> throwsTypes = null;
            while (sigp < sig.length() && sig.charAt(sigp) == '^') {
                sigp++;
                if (throwsTypes == null)
                    throwsTypes = new ArrayList<>();
                throwsTypes.add(parseTypeSignature());
            }
            return new MethodType(typeParamTypes, paramTypes, returnType, throwsTypes);
        } else {
            Type t = parseTypeSignature();
            if (typeParamTypes == null && sigp == sig.length())
                return t;
            Type superclass = t;
            List<Type> superinterfaces = null;
            while (sigp < sig.length()) {
                if (superinterfaces == null)
                    superinterfaces = new ArrayList<>();
                superinterfaces.add(parseTypeSignature());
            }
            return new ClassSigType(typeParamTypes, superclass, superinterfaces);

        }
    }

    private Type parseTypeSignature() {
        switch (sig.charAt(sigp)) {
            case 'B':
                sigp++;
                return new SimpleType("byte");

            case 'C':
                sigp++;
                return new SimpleType("char");

            case 'D':
                sigp++;
                return new SimpleType("double");

            case 'F':
                sigp++;
                return new SimpleType("float");

            case 'I':
                sigp++;
                return new SimpleType("int");

            case 'J':
                sigp++;
                return new SimpleType("long");

            case 'L':
                return parseClassTypeSignature();

            case 'S':
                sigp++;
                return new SimpleType("short");

            case 'T':
                return parseTypeVariableSignature();

            case 'V':
                sigp++;
                return new SimpleType("void");

            case 'Z':
                sigp++;
                return new SimpleType("boolean");

            case '[':
                sigp++;
                return new ArrayType(parseTypeSignature());

            case '*':
                sigp++;
                return new WildcardType();

            case '+':
                sigp++;
                return new WildcardType(WildcardType.Kind.EXTENDS, parseTypeSignature());

            case '-':
                sigp++;
                return new WildcardType(WildcardType.Kind.SUPER, parseTypeSignature());

            default:
                throw new IllegalStateException(debugInfo());
        }
    }

    private List<Type> parseTypeSignatures(char term) {
        sigp++;
        List<Type> types = new ArrayList<>();
        while (sig.charAt(sigp) != term)
            types.add(parseTypeSignature());
        sigp++;
        return types;
    }

    private Type parseClassTypeSignature() {
        assert sig.charAt(sigp) == 'L';
        sigp++;
        return parseClassTypeSignatureRest();
    }

    private Type parseClassTypeSignatureRest() {
        StringBuilder sb = new StringBuilder();
        List<Type> argTypes = null;
        ClassType t = null;
        char sigch ;

        do {
            switch  (sigch = sig.charAt(sigp)) {
                case '<':
                    argTypes = parseTypeSignatures('>');
                    break;

                case '.':
                case ';':
                    sigp++;
                    t = new ClassType(t, sb.toString(), argTypes);
                    sb.setLength(0);
                    argTypes = null;
                    break;

                default:
                    sigp++;
                    sb.append(sigch);
                    break;
            }
        } while (sigch != ';');

        return t;
    }

    private List<TypeParamType> parseTypeParamTypes() {
        assert sig.charAt(sigp) == '<';
        sigp++;
        List<TypeParamType> types = new ArrayList<>();
        while (sig.charAt(sigp) != '>')
            types.add(parseTypeParamType());
        sigp++;
        return types;
    }

    private TypeParamType parseTypeParamType() {
        int sep = sig.indexOf(":", sigp);
        String name = sig.substring(sigp, sep);
        Type classBound = null;
        List<Type> interfaceBounds = null;
        sigp = sep + 1;
        if (sig.charAt(sigp) != ':')
            classBound = parseTypeSignature();
        while (sig.charAt(sigp) == ':') {
            sigp++;
            if (interfaceBounds == null)
                interfaceBounds = new ArrayList<>();
            interfaceBounds.add(parseTypeSignature());
        }
        return new TypeParamType(name, classBound, interfaceBounds);
    }

    private Type parseTypeVariableSignature() {
        sigp++;
        int sep = sig.indexOf(';', sigp);
        Type t = new SimpleType(sig.substring(sigp, sep));
        sigp = sep + 1;
        return t;
    }

    private String debugInfo() {
        return sig.substring(0, sigp) + "!" + sig.charAt(sigp) + "!" + sig.substring(sigp+1);
    }

    private String sig;
    private int sigp;

    private Type type;
}

⏎ com/sun/tools/classfile/Signature.java

Or download all of them as a single archive file:

File name: jdk.jdeps-11.0.1-src.zip
File size: 244145 bytes
Release date: 2018-11-04
Download 

⇒ JDK 11 jdk.jdi.jmod - JDI Tool

⇐ JDK 11 jdk.jconsole.jmod - JConsole Tool

⇑ Download and Use JDK 11

⇑⇑ FAQ for JDK (Java Development Kit)