Fix javac --incremental by using jmake for dependency analysis

third_party/jmake/src/org/pantsbuild/jmake/Utils.java

Index: third_party/jmake/src/org/pantsbuild/jmake/Utils.java
diff --git a/third_party/jmake/src/org/pantsbuild/jmake/Utils.java b/third_party/jmake/src/org/pantsbuild/jmake/Utils.java
new file mode 100644
index 0000000000000000000000000000000000000000..38566a977847df84b9427e3a71c5eaeb4acf6dbb
--- /dev/null
+++ b/third_party/jmake/src/org/pantsbuild/jmake/Utils.java
@@ -0,0 +1,355 @@
+/* Copyright (c) 2002-2008 Sun Microsystems, Inc. All rights reserved
+ *
+ * This program is distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+package org.pantsbuild.jmake;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+/**
+ * Utility functions used by other classes from this package.
+ *
+ * @author Misha Dmitriev
+ * 23 January 2003
+ */
+public class Utils {
+
+    static final String REPORT_PROBLEM =
+            "Please report this problem to Mikhail.Dmitriev@sun.com";
+    static final byte[] MAGIC = {'J', 'a', 'v', 'a', 'm', 'a', 'k', 'e', ' ', 'P', 'r', 'o', 'j', 'e', 'c', 't', ' ', 'D', 'a', 't', 'a', 'b', 'a', 's', 'e', ' ', 'F', 'i', 'l', 'e'};
+    static final int magicLength = MAGIC.length;
+    static final int PDB_FORMAT_CODE_OLD = 1;
+    static final int PDB_FORMAT_CODE_133 = 0x01030300;
+    static final int PDB_FORMAT_CODE_LATEST = PDB_FORMAT_CODE_133;
+    static final int JAVAC_TARGET_RELEASE_OLDEST = 0x01040000;  // 1.4 and previous versions
+    static final int JAVAC_TARGET_RELEASE_15 = 0x01050000;  // if class is compiled with -target 1.5
+    static final int JAVAC_TARGET_RELEASE_16 = 0x01060000;  // if class is compiled with -target 1.6
+    static final int JAVAC_TARGET_RELEASE_17 = 0x01070000;  // if class is compiled with -target 1.7
+    static final int JAVAC_TARGET_RELEASE_18 = 0x01080000;  // if class is compiled with -target 1.8
+    static int warningLimit = 20;  // Maximum number of warnings to print
+    static final int TIMING_TOTAL = 0;
+    static final int TIMING_PDBREAD = 1;
+    static final int TIMING_SYNCHRO = 2;
+    static final int TIMING_SYNCHRO_CHECK_JAVA_FILES = 3;
+    static final int TIMING_FIND_UPDATED_JAVA_FILES = 4;
+    static final int TIMING_CLASS_FILE_OBSOLETE_OR_DELETED = 5;
+    static final int TIMING_COMPILE = 6;
+    static final int TIMING_FIND_UPDATED_CLASSES = 7;
+    static final int TIMING_CHECK_UPDATED_CLASSES = 8;
+    static final int TIMING_PDBWRITE = 9;
+    static final int TIMING_SYNCHRO_CHECK_TMP = 10;
+    static final int TIMING_CLASS_FILE_OBSOLETE_TMP = 11;
+    static final int TIMING_PDBUPDATE = 12;
+    static final int TIMING_ARRAY_LENGTH = 13;
+    private static long timings[] = new long[TIMING_ARRAY_LENGTH];
+    private static boolean timingOn = false;
+
+
+    // -------------------------------------------------------------------------------
+    // Name manipulation stuff
+    // -------------------------------------------------------------------------------
+    /**
+     * Returns package name for the given class. In case of no package, returns an
+     * empty, but non-null string. Returned string is interned.
+     */
+    public static String getPackageName(String clazzName) {
+        int ldi = clazzName.lastIndexOf('/');  // For convenience, we use system-internal slashes, not dots
+        if (ldi == -1) {
+            return "";
+        } else {
+            return clazzName.substring(0, ldi).intern();
+        }
+    }
+
+    /**
+     * Returns directly enclosing class name for the given class. If the given class is not a
+     * nested class, returns empty, but non-null string. Returned string is interned.
+     * NOTE FOR JDK 1.5: this function has to work with both old (1.4 and before) and new (1.5) ways
+     * of naming non-member classes. javacTargetRelease determines the javac version for this class;
+     * however on rare occasions (when checking a deleted non-project class) it may be 0, denoting
+     * that javac version is not known.
+     * In that case, we use the old algorithm, which is error-prone due to a bug in nested class
+     * naming that existed prior to JDK 1.5, where both a non-member local nested class B of A, and a
+     * member nested class B of anonymous class A$1, are named A$1$B.
+     */
+    public static String getDirectlyEnclosingClass(String clazzName, int javacTargetRelease) {
+        int ldi = clazzName.lastIndexOf('$');
+        if (ldi == -1) {
+            return "";
+        }
+
+        if (javacTargetRelease >= JAVAC_TARGET_RELEASE_15) {
+            return clazzName.substring(0, ldi).intern();
+        } else {   // JAVAC_TARGET_RELEASE_OLDEST or unknown
+            // Take into account local classes which are named like "EncClass$1$LocalClass", where EncClass
+            // is directly enclosing class.
+            int lldi = clazzName.lastIndexOf('$', ldi - 1);
+            if (lldi == -1 || !Character.isDigit(clazzName.charAt(lldi + 1))) {
+                return clazzName.substring(0, ldi).intern();
+            } else {
+                return clazzName.substring(0, lldi).intern();
+            }
+        }
+    }
+
+    /**
+     * Returns top-level enclosing class name for the given class. If the given class is not a
+     * nested class, returns empty, but non-null string. Returned string is interned.
+     */
+    public static String getTopLevelEnclosingClass(String clazzName) {
+        int fdi = clazzName.indexOf('$');
+        if (fdi == -1) {
+            return "";
+        }
+
+        return clazzName.substring(0, fdi).intern();
+    }
+
+    /**
+     * Given the full path for the enclosing class file and the full name for the nested class, return the supposed
+     * full path for the nested class.
+     */
+    public static String getClassFileFullPathForNestedClass(String enclosingClassFileFullPath, String nestedClassFullName) {
+        String enclosingClassDir = enclosingClassFileFullPath;
+        int cutIndex = enclosingClassDir.lastIndexOf(File.separatorChar);
+        enclosingClassDir = enclosingClassDir.substring(0, cutIndex + 1); // If slash is present, it's included, otherwise we get ""
+        cutIndex = nestedClassFullName.lastIndexOf('/');
+        String nestedClassLocalName;
+        if (cutIndex < 0) {
+            nestedClassLocalName = nestedClassFullName;
+        } else {
+            nestedClassLocalName = nestedClassFullName.substring(cutIndex + 1);
+        }
+        return enclosingClassDir + nestedClassLocalName + ".class";
+    }
+
+    /**
+     * For two strings representing signatures, check if the number of parameters in
+     * both is the same.
+     */
+    public static boolean sameParamNumber(String sig1, String sig2) {
+        return getParamNumber(sig1) == getParamNumber(sig2);
+    }
+
+    private static int getParamNumber(String sig) {
+        char ch;
+        int parNo = 0, pos = 0;
+        do {
+            ch = sig.charAt(++pos);
+            if (ch == ')') {
+                break;
+            }
+            while (ch == '[') {
+                ch = sig.charAt(++pos);
+            }
+            parNo++;
+            if (ch == '@') {
+                // We replaced all "Lclassname;" in signatures with "@classname#"
+                while (ch != '#') {
+                    ch = sig.charAt(++pos);
+                }
+            }
+        } while (ch != ')');
+        return parNo;
+    }
+
+
+    // -------------------------------------------------------------------------------
+    // File related stuff
+    // -------------------------------------------------------------------------------
+    public static File checkFileForName(String name) {
+        // For each .java file, a File object is created two times when jmake executes: first when we synchronise the PCD
+        // and the supplied .java file list (we make sure that the .java file exists), and second time when we check if a class
+        // file was updated (we compare time stamps of the .java and the .class file). I tried to call this routine for a .java
+        // class both times, and cached File objects, but it looks as if this does not bring any real speed-up (and in fact may
+        // even slow down the application). Most of the time seems to go to the underlying code creating internal File
+        // representation; once it is created, it takes little time to execute another "new File()" for it. Also, all operations
+        // on files like getCanonicalPath() or lastModified() seem to be quite expensive, so their unnecessary repetition should
+        // be avoided as much as possible.
+        if (name == null) {
+            return null;
+        }
+        File file = new File(name);
+        if (file.exists()) {
+            return file;
+        }
+        return null;
+    }
+
+    public static File checkOrCreateDirForName(String name) {
+        File file = new File(name);
+        if (!file.exists()) {
+            file.mkdirs();
+        }
+        if (file.exists()) {
+            if (!file.isDirectory()) {
+                throw new PrivateException(new PublicExceptions.InternalException(file + " is not a directory."));
+            }
+            return file;
+        }
+        return null;
+    }
+
+    public static byte[] readFileIntoBuffer(File file) {
+        try {
+            InputStream in = new FileInputStream(file);
+            int len = (int) file.length();
+            return readInputStreamIntoBuffer(in, len);
+        } catch (IOException e) {
+            throw new PrivateException(e);
+        }
+    }
+
+    public static byte[] readZipEntryIntoBuffer(ZipFile file, ZipEntry entry) {
+        try {
+            InputStream in = file.getInputStream(entry);
+            int len = (int) entry.getSize();
+            return Utils.readInputStreamIntoBuffer(in, len);
+        } catch (IOException e) {
+            throw new PrivateException(e);
+        }
+    }
+
+    public static byte[] readInputStreamIntoBuffer(InputStream in, int len) throws IOException {
+        byte buf[] = new byte[len];
+        int readBytes, ofs = 0, remBytes = len;
+        do {
+            readBytes = in.read(buf, ofs, remBytes);
+            ofs += readBytes;
+            remBytes -= readBytes;
+        } while (ofs < len);
+        in.close();
+        return buf;
+    }
+
+    public static void readAndPrintBytesFromStream(InputStream in, OutputStream out) throws IOException {
+        int avail = in.available();
+        if (avail > 0) {
+            byte outbytes[] = new byte[avail];
+            int realOutBytes = in.read(outbytes);
+            out.write(outbytes, 0, realOutBytes);
+        }
+    }
+
+    /** For a Windows path, convert the drive letter to the lower case */
+    public static String convertDriveLetterToLowerCase(String path) {
+        if (path.charAt(1) != ':') {
+            return path;
+        }
+        char drive = path.charAt(0);
+        if (Character.isUpperCase(drive)) {
+            drive = Character.toLowerCase(drive);
+            char[] chars = path.toCharArray();
+            chars[0] = drive;
+            path = new String(chars);
+        }
+        return path;
+    }
+
+    public static void ignore(Exception e) {
+        // Ignore this exception
+    }
+
+    /** Used when invoking a third-party executable compiler app */
+    public static void delay(int ms) {
+        Object o = new Object();
+        synchronized (o) {
+            try {
+                o.wait(ms);
+            } catch (InterruptedException e) {
+            }
+        }
+    }
+    // -------------------------------------------------------------------------------
+    // Custom printing stuff
+    // -------------------------------------------------------------------------------
+    private static PrintStream out = System.out;
+    private static PrintStream warn = System.out;
+    private static PrintStream err = System.err;
+    private static boolean printInfoMessages = true;
+    private static boolean printWarningMessages = true;
+    private static boolean printErrorMessages = true;
+    private static int warningNo;
+
+    public static void setOutputStreams(PrintStream out, PrintStream warn, PrintStream err) {
+        Utils.out = out;
+        Utils.warn = warn;
+        Utils.err = err;
+    }
+
+    public static void customizeOutput(boolean printInfoMessages, boolean printWarningMessages, boolean printErrorMessages) {
+        Utils.printInfoMessages = printInfoMessages;
+        Utils.printWarningMessages = printWarningMessages;
+        Utils.printErrorMessages = printErrorMessages;
+    }
+
+    public static void printInfoMessage(String message) {
+        if (printInfoMessages) {
+            out.println(message);
+        }
+    }
+
+    public static void printInfoMessageNoEOL(String message) {
+        if (printInfoMessages) {
+            out.print(message);
+        }
+    }
+
+    public static void printWarningMessage(String message) {
+        if (!printWarningMessages) {
+            return;
+        }
+        if (warningNo < warningLimit) {
+            warn.println(message);
+        } else if (warningNo == warningLimit) {
+            warn.println("jmake: more than " + warningLimit + " warnings.");
+        }
+        warningNo++;
+    }
+
+    public static void printErrorMessage(String message) {
+        if (printErrorMessages) {
+            err.println("jmake: " + message);
+        }
+    }
+
+    // -------------------------------------------------------------------------------
+    // Measuring stuff
+    // -------------------------------------------------------------------------------
+    public static void setTimingOn() {
+        timingOn = true;
+    }
+
+    public static void startTiming(int slot) {
+        timings[slot] = System.currentTimeMillis();
+    }
+
+    public static void stopAndPrintTiming(String message, int slot) {
+        if (timingOn) {
+            long time = System.currentTimeMillis() - timings[slot];
+            printInfoMessage("========== " + message + " time = " + time);
+        }
+    }
+
+    public static void printTiming(String message, int slot) {
+        if (timingOn) {
+            printInfoMessage("========== " + message + " time = " + timings[slot]);
+        }
+    }
+
+    public static void stopAndAddTiming(int slot1, int slot2) {
+        if (timingOn) {
+            long time = System.currentTimeMillis() - timings[slot1];
+            timings[slot2] += time;
+        }
+    }
+}