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/util/DiagnosticSource.java

/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package com.sun.tools.javac.util;

import java.io.IOException;
import java.lang.ref.SoftReference;
import java.nio.CharBuffer;
import javax.tools.JavaFileObject;

import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.tree.EndPosTable;

import static com.sun.tools.javac.util.LayoutCharacters.*;

/**
 * A simple abstraction of a source file, as needed for use in a diagnostic message.
 * Provides access to the line and position in a line for any given character offset.
 *
 *  <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 DiagnosticSource {

    /* constant DiagnosticSource to be used when sourcefile is missing */
    public static final DiagnosticSource NO_SOURCE = new DiagnosticSource() {
        @Override
        protected boolean findLine(int pos) {
            return false;
        }
    };

    public DiagnosticSource(JavaFileObject fo, AbstractLog log) {
        this.fileObject = fo;
        this.log = log;
    }

    private DiagnosticSource() {}

    /** Return the underlying file object handled by this
     *  DiagnosticSource object.
     */
    public JavaFileObject getFile() {
        return fileObject;
    }

    /** Return the one-based line number associated with a given pos
     * for the current source file.  Zero is returned if no line exists
     * for the given position.
     */
    public int getLineNumber(int pos) {
        try {
            if (findLine(pos)) {
                return line;
            }
            return 0;
        } finally {
            buf = null;
        }
    }

    /** Return the one-based column number associated with a given pos
     * for the current source file.  Zero is returned if no column exists
     * for the given position.
     */
    public int getColumnNumber(int pos, boolean expandTabs) {
        try {
            if (findLine(pos)) {
                int column = 0;
                for (int bp = lineStart; bp < pos; bp++) {
                    if (bp >= bufLen) {
                        return 0;
                    }
                    if (buf[bp] == '\t' && expandTabs) {
                        column = (column / TabInc * TabInc) + TabInc;
                    } else {
                        column++;
                    }
                }
                return column + 1; // positions are one-based
            }
            return 0;
        } finally {
            buf = null;
        }
    }

    /** Return the content of the line containing a given pos.
     */
    public String getLine(int pos) {
        try {
            if (!findLine(pos))
                return null;

            int lineEnd = lineStart;
            while (lineEnd < bufLen && buf[lineEnd] != CR && buf[lineEnd] != LF)
                lineEnd++;
            if (lineEnd - lineStart == 0)
                return null;
            return new String(buf, lineStart, lineEnd - lineStart);
        } finally {
            buf = null;
        }
    }

    public EndPosTable getEndPosTable() {
        return endPosTable;
    }

    public void setEndPosTable(EndPosTable t) {
        if (endPosTable != null && endPosTable != t)
            throw new IllegalStateException("endPosTable already set");
        endPosTable = t;
    }

    /** Find the line in the buffer that contains the current position
     * @param pos      Character offset into the buffer
     */
    protected boolean findLine(int pos) {
        if (pos == Position.NOPOS)
            return false;

        try {
            // try and recover buffer from soft reference cache
            if (buf == null && refBuf != null)
                buf = refBuf.get();

            if (buf == null) {
                buf = initBuf(fileObject);
                lineStart = 0;
                line = 1;
            } else if (lineStart > pos) { // messages don't come in order
                lineStart = 0;
                line = 1;
            }

            int bp = lineStart;
            while (bp < bufLen && bp < pos) {
                switch (buf[bp++]) {
                case CR:
                    if (bp < bufLen && buf[bp] == LF) bp++;
                    line++;
                    lineStart = bp;
                    break;
                case LF:
                    line++;
                    lineStart = bp;
                    break;
                }
            }
            return bp <= bufLen;
        } catch (IOException e) {
            log.directError("source.unavailable");
            buf = new char[0];
            return false;
        }
    }

    protected char[] initBuf(JavaFileObject fileObject) throws IOException {
        char[] buf;
        CharSequence cs = fileObject.getCharContent(true);
        if (cs instanceof CharBuffer) {
            CharBuffer cb = (CharBuffer) cs;
            buf = JavacFileManager.toArray(cb);
            bufLen = cb.limit();
        } else {
            buf = cs.toString().toCharArray();
            bufLen = buf.length;
        }
        refBuf = new SoftReference<>(buf);
        return buf;
    }

    /** The underlying file object. */
    protected JavaFileObject fileObject;

    protected EndPosTable endPosTable;

    /** A soft reference to the content of the file object. */
    protected SoftReference<char[]> refBuf;

    /** A temporary hard reference to the content of the file object. */
    protected char[] buf;

    /** The length of the content. */
    protected int bufLen;

    /** The start of a line found by findLine. */
    protected int lineStart;

    /** The line number of a line found by findLine. */
    protected int line;

    /** A log for reporting errors, such as errors accessing the content. */
    protected AbstractLog log;
}

⏎ com/sun/tools/javac/util/DiagnosticSource.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
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