/** Performs peephole optimizations on a program's live methods. */
  private static void peephole(final BloatContext context) {

    final Set liveMethods = new TreeSet(new MemberRefComparator());
    final CallGraph cg = context.getCallGraph();
    liveMethods.addAll(cg.liveMethods());

    // Perform peephole optimizations. We do this separately because
    // some peephole optimizations do things to the stack that
    // inlining doesn't like. For instance, a peephole optimizations
    // might make it so that a method has a non-empty stack upon
    // return. Inlining will barf at the sight of this.
    BloatBenchmark.tr("Performing peephole optimizations");

    final Iterator iter = liveMethods.iterator();
    while (BloatBenchmark.PEEPHOLE && iter.hasNext()) {
      try {
        final MethodEditor live = context.editMethod((MemberRef) iter.next());
        Peephole.transform(live);
        context.commit(live.methodInfo());
        context.release(live.methodInfo());

      } catch (final NoSuchMethodException ex314) {
        BloatBenchmark.err.println("** Could not find method " + ex314.getMessage());
        ex314.printStackTrace(System.err);
        System.exit(1);
      }
    }
  }
  /** Specializes the live methods in a program. */
  private static void specialize(final BloatContext context) {

    final CallGraph cg = context.getCallGraph();

    final Set liveMethods = new TreeSet(new MemberRefComparator());
    liveMethods.addAll(cg.liveMethods());

    // Specialize all possible methods
    final InlineStats stats = context.getInlineStats();

    if (BloatBenchmark.statsFile != null) {
      Specialize.STATS = true;
      stats.setConfigName("BloatBenchmark");
    }

    if (BloatBenchmark.MORPH != -1) {
      Specialize.MAX_MORPH = BloatBenchmark.MORPH;
    }
    final Specialize spec = new Specialize(context);

    if (Specialize.STATS) {
      stats.noteLiveMethods(liveMethods.size());
      stats.noteLiveClasses(cg.liveClasses().size());
    }

    BloatBenchmark.tr("Specializing live methods");
    final Iterator iter = liveMethods.iterator();

    for (int count = 0; iter.hasNext(); count++) {
      try {
        final MethodEditor live = context.editMethod((MemberRef) iter.next());

        if (context.ignoreMethod(live.memberRef())) {
          // Don't display ignored methods, it's misleading.
          continue;
        }

        BloatBenchmark.tr(
            "  " + count + ") " + live.declaringClass().name() + "." + live.name() + live.type());

        spec.specialize(live);

      } catch (final NoSuchMethodException ex2) {
        BloatBenchmark.err.println("** Could not find method " + ex2.getMessage());
        System.exit(1);
      }
    }
  }
  /** Inlines calls to static methods in the live methods of a given program. */
  private static void inline(final BloatContext context) {

    final Set liveMethods = new TreeSet(new MemberRefComparator());
    final CallGraph cg = context.getCallGraph();
    liveMethods.addAll(cg.liveMethods());

    BloatBenchmark.tr("Inlining " + liveMethods.size() + " live methods");

    if (BloatBenchmark.CALLEE_SIZE != -1) {
      Inline.CALLEE_SIZE = BloatBenchmark.CALLEE_SIZE;
    }

    final Iterator iter = liveMethods.iterator();
    for (int count = 0; BloatBenchmark.INLINE && iter.hasNext(); count++) {
      try {
        final MethodEditor live = context.editMethod((MemberRef) iter.next());

        if (context.ignoreMethod(live.memberRef())) {
          // Don't display ignored methods, it's misleading.
          continue;
        }

        BloatBenchmark.tr(
            "  " + count + ") " + live.declaringClass().name() + "." + live.name() + live.type());

        final Inline inline = new Inline(context, BloatBenchmark.SIZE);
        inline.setMaxCallDepth(BloatBenchmark.DEPTH);
        inline.inline(live);

        // Commit here in an attempt to conserve memory
        context.commit(live.methodInfo());
        context.release(live.methodInfo());

      } catch (final NoSuchMethodException ex3) {
        BloatBenchmark.err.println("** Could not find method " + ex3.getMessage());
        System.exit(1);
      }
    }
  }
  /**
   * Returns the live methods of a program whose root methods are the <tt>main</tt> method of a set
   * of classes.
   *
   * @param classes Names of classes containing root methods
   * @param context Repository for accessing BLOAT stuff
   * @return The <tt>MemberRef</tt>s of the live methods
   */
  private static Collection liveMethods(final Collection classes, final BloatContext context) {

    // Determine the roots of the call graph
    final Set roots = new HashSet();
    Iterator iter = classes.iterator();
    while (iter.hasNext()) {
      final String className = (String) iter.next();
      try {
        final ClassEditor ce = context.editClass(className);
        final MethodInfo[] methods = ce.methods();

        for (int i = 0; i < methods.length; i++) {
          final MethodEditor me = context.editMethod(methods[i]);

          if (!me.name().equals("main")) {
            continue;
          }

          BloatBenchmark.tr("  Root " + ce.name() + "." + me.name() + me.type());
          roots.add(me.memberRef());
        }

      } catch (final ClassNotFoundException ex1) {
        BloatBenchmark.err.println("** Could not find class: " + ex1.getMessage());
        System.exit(1);
      }
    }

    if (roots.isEmpty()) {
      BloatBenchmark.err.print("** No main method found in classes: ");
      iter = classes.iterator();
      while (iter.hasNext()) {
        final String name = (String) iter.next();
        BloatBenchmark.err.print(name);
        if (iter.hasNext()) {
          BloatBenchmark.err.print(", ");
        }
      }
      BloatBenchmark.err.println("");
    }

    context.setRootMethods(roots);
    final CallGraph cg = context.getCallGraph();

    final Set liveMethods = new TreeSet(new MemberRefComparator());
    liveMethods.addAll(cg.liveMethods());

    return (liveMethods);
  }
Example #5
0
  /**
   * Parse the command line. Inserts residency, update, and swizzle checks into the bytecode of the
   * methods of the specified classes.
   */
  public static void main(final String[] args) {
    final ClassFileLoader loader = new ClassFileLoader();
    List classes = new ArrayList(); // Names of classes from command line
    boolean gotdir = false; // Did user specify an output dir?

    for (int i = 0; i < args.length; i++) {
      if (args[i].equals("-v") || args[i].equals("-verbose")) {
        Main.VERBOSE++;
      } else if (args[i].equals("-help")) {
        Main.usage();
      } else if (args[i].equals("-classpath")) {
        if (++i >= args.length) {
          Main.usage();
        }

        final String classpath = args[i];
        loader.setClassPath(classpath);
      } else if (args[i].equals("-skip")) {
        if (++i >= args.length) {
          Main.usage();
        }

        final String pkg = args[i].replace('.', '/');
        Main.SKIP.add(pkg);
      } else if (args[i].equals("-only")) {
        if (++i >= args.length) {
          Main.usage();
        }

        final String pkg = args[i].replace('.', '/');
        Main.ONLY.add(pkg);
      } else if (args[i].equals("-closure")) {
        Main.CLOSURE = true;
      } else if (args[i].equals("-relax-loading")) {
        ClassHierarchy.RELAX = true;
      } else if (args[i].equals("-f")) {
        Main.FORCE = true;
      } else if (args[i].equals("-norc")) {
        Main.RC = false;
      } else if (args[i].equals("-rc")) {
        Main.RC = true;
      } else if (args[i].equals("-nouc")) {
        Main.UC = false;
      } else if (args[i].equals("-uc")) {
        Main.UC = true;
      } else if (args[i].equals("-nosc")) {
        Main.SC = false;
      } else if (args[i].equals("-sc")) {
        Main.SC = true;
      } else if (args[i].startsWith("-")) {
        Main.usage();
      } else if (i == args.length - 1) {
        // Last argument is the name of the outpu directory
        final File f = new File(args[i]);

        if (f.exists() && !f.isDirectory()) {
          System.err.println("No such directory: " + f.getPath());
          System.exit(2);
        }

        loader.setOutputDir(f);
        gotdir = true;
      } else {
        classes.add(args[i]);
      }
    }

    if (!gotdir) {
      Main.usage();
    }

    if (classes.size() == 0) {
      Main.usage();
    }

    if (Main.VERBOSE > 3) {
      ClassFileLoader.DEBUG = true;
      ClassEditor.DEBUG = true;
    }

    boolean errors = false;

    final Iterator iter = classes.iterator();

    // Load each class specified on the command line
    while (iter.hasNext()) {
      final String name = (String) iter.next();

      try {
        loader.loadClass(name);
      } catch (final ClassNotFoundException ex) {
        System.err.println("Couldn't find class: " + ex.getMessage());
        errors = true;
      }
    }

    if (errors) {
      System.exit(1);
    }

    final BloatContext context = new CachingBloatContext(loader, classes, Main.CLOSURE);

    if (!Main.CLOSURE) {
      final Iterator e = classes.iterator();

      while (e.hasNext()) {
        final String name = (String) e.next();
        try {
          final ClassInfo info = loader.loadClass(name);
          Main.decorateClass(context, info);
        } catch (final ClassNotFoundException ex) {
          System.err.println("Couldn't find class: " + ex.getMessage());
          System.exit(1);
        }
      }
    } else {
      classes = null;

      final ClassHierarchy hier = context.getHierarchy();

      final Iterator e = hier.classes().iterator();

      while (e.hasNext()) {
        final Type t = (Type) e.next();

        if (t.isObject()) {
          try {
            final ClassInfo info = loader.loadClass(t.className());
            Main.decorateClass(context, info);
          } catch (final ClassNotFoundException ex) {
            System.err.println("Couldn't find class: " + ex.getMessage());
            System.exit(1);
          }
        }
      }
    }
  }
  /**
   * Performs intraprocedural BLOAT on a program's live methods.
   *
   * @param liveMethods Should be alphabetized. This way we can commit a class once we've BLOATed
   *     all of its methods.
   */
  private static void intraBloat(final Collection liveMethods, final BloatContext context) {

    ClassEditor prevClass = null;
    final Iterator iter = liveMethods.iterator();
    for (int count = 0; iter.hasNext(); count++) {
      MethodEditor live = null;
      ClassEditor ce = null; // Hack to make sure commit happens
      try {
        live = context.editMethod((MemberRef) iter.next());
        ce = context.editClass(live.declaringClass().classInfo());

      } catch (final NoSuchMethodException ex3) {
        BloatBenchmark.err.println("** Could not find method " + ex3.getMessage());
        System.exit(1);
      }

      /* So we can skip classes or packages */
      final String name = ce.type().className();
      final String qual = ce.type().qualifier() + "/*";
      boolean skip = false;
      for (int i = 0; i < BloatBenchmark.SKIP.size(); i++) {
        final String pkg = (String) BloatBenchmark.SKIP.get(i);

        if (name.equals(pkg) || qual.equals(pkg)) {
          skip = true;
          break;
        }
      }

      if (context.ignoreMethod(live.memberRef()) || skip) {
        // Don't display ignored methods, it's misleading.
        context.release(live.methodInfo());
        continue;
      }

      final Runtime runtime = Runtime.getRuntime();
      runtime.gc();

      final Date start = new Date();
      BloatBenchmark.tr(
          "  " + count + ") " + live.declaringClass().name() + "." + live.name() + live.type());
      BloatBenchmark.tr("    Start: " + start);

      try {
        EDU.purdue.cs.bloat.optimize.Main.TRACE = BloatBenchmark.TRACE;
        if (!BloatBenchmark.VERIFY) {
          EDU.purdue.cs.bloat.optimize.Main.VERIFY = false;
        }
        EDU.purdue.cs.bloat.optimize.Main.bloatMethod(live, context);

      } catch (final Exception oops) {
        BloatBenchmark.err.println("******************************************");
        BloatBenchmark.err.println(
            "Exception while BLOATing "
                + live.declaringClass().name()
                + "."
                + live.name()
                + live.type());
        BloatBenchmark.err.println(oops.getMessage());
        oops.printStackTrace(System.err);
        BloatBenchmark.err.println("******************************************");
      }

      // Commit here in an attempt to conserve memory
      context.commit(live.methodInfo());
      context.release(live.methodInfo());

      if (prevClass == null) {
        prevClass = ce;

      } else if (!prevClass.equals(ce)) {
        // We've finished BLOATed the methods for prevClass, commit
        // prevClass and move on
        BloatBenchmark.tr(prevClass.type() + " != " + ce.type());
        context.commit(prevClass.classInfo());
        context.release(prevClass.classInfo());
        // context.commitDirty();
        // tr(context.toString());
        prevClass = ce;

      } else {
        context.release(ce.classInfo());
      }

      final Date end = new Date();
      BloatBenchmark.tr("    Ellapsed time: " + (end.getTime() - start.getTime()) + " ms");
    }

    context.commitDirty();
  }