JDK 11 jdk.compiler.jmod is the JMOD file for JDK 11 Compiler tool, which can be invoked by the "javac" command.

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

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

JDK 11 Compiler source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.compiler.

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

⏎ com/sun/tools/javac/file/CacheFSInfo.java

/*
 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.tools.javac.file;

import java.io.IOException;
import java.nio.file.Path;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Context.Factory;

/**
 * Caching implementation of FSInfo.
 *
 * <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 CacheFSInfo extends FSInfo {

    /**
     * Register a Context.Factory to create a CacheFSInfo.
     */
    public static void preRegister(Context context) {
        context.put(FSInfo.class, (Factory<FSInfo>)c -> {
                FSInfo instance = new CacheFSInfo();
                c.put(FSInfo.class, instance);
                return instance;
            });
    }

    public void clearCache() {
        cache.clear();
    }

    @Override
    public Path getCanonicalFile(Path file) {
        Entry e = getEntry(file);
        return e.canonicalFile;
    }

    @Override
    public boolean exists(Path file) {
        Entry e = getEntry(file);
        return e.exists;
    }

    @Override
    public boolean isDirectory(Path file) {
        Entry e = getEntry(file);
        return e.isDirectory;
    }

    @Override
    public boolean isFile(Path file) {
        Entry e = getEntry(file);
        return e.isFile;
    }

    @Override
    public List<Path> getJarClassPath(Path file) throws IOException {
        // don't bother to lock the cache, because it is thread-safe, and
        // because the worst that can happen would be to create two identical
        // jar class paths together and have one overwrite the other.
        Entry e = getEntry(file);
        if (e.jarClassPath == null)
            e.jarClassPath = super.getJarClassPath(file);
        return e.jarClassPath;
    }

    private Entry getEntry(Path file) {
        // don't bother to lock the cache, because it is thread-safe, and
        // because the worst that can happen would be to create two identical
        // entries together and have one overwrite the other.
        Entry e = cache.get(file);
        if (e == null) {
            e = new Entry();
            e.canonicalFile = super.getCanonicalFile(file);
            e.exists = super.exists(file);
            e.isDirectory = super.isDirectory(file);
            e.isFile = super.isFile(file);
            cache.put(file, e);
        }
        return e;
    }

    // could also be a Map<File,SoftReference<Entry>> ?
    private final Map<Path,Entry> cache = new ConcurrentHashMap<>();

    private static class Entry {
        Path canonicalFile;
        boolean exists;
        boolean isFile;
        boolean isDirectory;
        List<Path> jarClassPath;
    }
}

⏎ com/sun/tools/javac/file/CacheFSInfo.java

Or download all of them as a single archive file:

File name: jdk.compiler-11.0.1-src.zip
File size: 1347269 bytes
Release date: 2018-11-04
Download 

⇒ JDK 11 jdk.crypto.cryptoki.jmod - Crypto KI Module

⇐ JDK 11 jdk.charsets.jmod - Charsets Module

⇑ Download and Use JDK 11

⇑⇑ FAQ for JDK (Java Development Kit)