/**
   * 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);
  }
Esempio n. 2
0
  /**
   * Performs the actual editing of a class. Does a whole mess of stuff including reading in the
   * classfile, building data structures to represent the class file, converting the CFG for each
   * method in the class into SSA form, perform some anlayses and optimizations on the method, and
   * finally committing it back to the class file. Phew.
   */
  private static void editClass(final String className) {
    ClassFile classFile; // Holds info about a class (implements
    // ClassInfo)

    // Get information about the class className
    try {
      classFile = (ClassFile) Main.context.loadClass(className);
    } catch (final ClassNotFoundException ex) {
      System.err.println("** Couldn't find class: " + ex.getMessage());
      return;
    }

    if (!Main.FORCE) {
      // Check to see if the file is up-to-date (i.e. has been
      // recompiled since it was last optimized). If so, do nothing
      // because the FORCE flag is false.

      final File source = classFile.file();
      final File target = classFile.outputFile();

      if ((source != null)
          && (target != null)
          && source.exists()
          && target.exists()
          && (source.lastModified() < target.lastModified())) {

        if (Main.VERBOSE) {
          System.out.println(classFile.name() + " is up to date");
        }

        return;
      }
    }

    if (Main.DEBUG) {
      // Print the contents of the class file to System.out
      classFile.print(System.out);
    }

    final ClassEditor c = Main.context.editClass(classFile);

    boolean skip = false;

    final String name = c.type().className();
    final String qual = c.type().qualifier() + "/*";

    // Edit only classes explicitly mentioned.
    if (Main.ONLY.size() > 0) {
      skip = true;

      // Only edit classes we explicitly don't name.
      for (int i = 0; i < Main.ONLY.size(); i++) {
        final String pkg = (String) Main.ONLY.get(i);

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

    // Don't edit classes we explicitly skip.
    if (!skip) {
      for (int i = 0; i < Main.SKIP.size(); i++) {
        final String pkg = (String) Main.SKIP.get(i);

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

    if (skip) {
      if (Main.VERBOSE) {
        System.out.println("Skipping " + c.type().className());
      }

      // We're done with this class file, decrement its reference count
      Main.context.release(classFile);
      return;
    }

    // Touch the output file first. That is, create the file, but make
    // it empty, just to make sure we can create it.

    try {
      final File f = classFile.outputFile();

      if (f.exists()) {
        f.delete();
      }

      final File dir = new File(f.getParent());
      dir.mkdirs();

      if (!dir.exists()) {
        throw new RuntimeException("Couldn't create directory: " + dir);
      }

      final DataOutputStream out = new DataOutputStream(new FileOutputStream(f));
      new PrintStream(out).println();
      out.close();
    } catch (final IOException e) {
      e.printStackTrace();
      System.exit(1);
    }

    if (Main.VERBOSE) {
      System.out.println("Optimizing " + c.type().className());
    }

    // Finally, we can start playing with the methods...
    final MethodInfo[] methods = c.methods();

    final int numMethods = methods.length + 1;
    ;
    int whichMethod = 0;

    for (int j = 0; j < methods.length; j++) {
      final MethodEditor m;

      try {
        m = Main.context.editMethod(methods[j]);
      } catch (final ClassFormatException ex) {
        System.err.println(ex.getMessage());
        continue;
      }

      if (Main.TRACE) {
        whichMethod++;
        System.out.println(
            "Optimizing "
                + name
                + "."
                + m.name()
                + " (method "
                + whichMethod
                + " of "
                + numMethods
                + ")");
      }

      if (Main.METHOD != null) {
        // A method name has been specified on the command line using
        // -only-method.
        boolean pass = true;

        String t = m.name() + m.type();

        if (t.equals(Main.METHOD)) {
          pass = false;
        }

        t = m.name();

        if (t.equals(Main.METHOD)) {
          pass = false;
        }

        if (pass) {
          // This isn't the method we're looking for.
          // Decrement its reference count.
          Main.context.release(methods[j]);
          continue;
        }
      }

      if (Main.DEBUG) {
        m.print(System.out);
      }

      if (m.isNative() || m.isAbstract()) {
        // We can't edit native or abstract methods
        Main.context.release(methods[j]);
        continue;
      }

      Main.bloatMethod(m, Main.context);
    }

    if (Main.ANNO) {
      String s = "Optimized with: EDU.purdue.cs.bloat.optimize.Main";

      for (int i = 0; i < Main.ARGS.length; i++) {
        if ((Main.ARGS[i].indexOf(' ') >= 0)
            || (Main.ARGS[i].indexOf('\t') >= 0)
            || (Main.ARGS[i].indexOf('\r') >= 0)
            || (Main.ARGS[i].indexOf('\n') >= 0)) {
          s += " '" + Main.ARGS[i] + "'";
        } else {
          s += " " + Main.ARGS[i];
        }
      }

      System.out.println(s);
      // c.constants().addConstant(Constant.UTF8, s);
    }

    Main.context.commit(classFile);
    Main.context.release(classFile);

    if (Main.TRACE) {
      System.out.println(Main.context.toString());
    }
  }
Esempio n. 3
0
  /**
   * Parses the command line. The user must specify at least one class to optimize and the directory
   * in which to place the optimized class files. The methods of the specified classes are then
   * optimized according to the command line options.
   *
   * @see ClassEditor
   * @see ClassFileLoader
   * @see ClassFile
   * @see MethodEditor
   * @see MethodInfo
   * @see CompactArrayInitializer
   * @see FlowGraph
   */
  public static void main(final String[] args) {
    try {
      Main.loader = new ClassFileLoader();

      List classes = new ArrayList(args.length); // The classes to
      // optimize
      boolean gotdir = false; // Has an output directory been specified?

      Main.ARGS = args;

      for (int i = 0; i < args.length; i++) {
        if (args[i].equals("-v") || args[i].equals("-verbose")) {
          Main.VERBOSE = true;
          Main.loader.setVerbose(true);

        } else if (args[i].equals("-debug")) {
          Main.DEBUG = true;
          Main.loader.setVerbose(true);
          ClassFileLoader.DEBUG = true;
          CompactArrayInitializer.DEBUG = true;
          ClassEditor.DEBUG = true;
          FlowGraph.DEBUG = true;
          DominatorTree.DEBUG = true;
          Tree.DEBUG = true;
          CodeGenerator.DEBUG = true;
          Liveness.DEBUG = true;
          SSA.DEBUG = true;
          SSAGraph.DEBUG = true;
          PersistentCheckElimination.DEBUG = true;
          ValueNumbering.DEBUG = true;
          ValueFolding.DEBUG = true;
          ClassHierarchy.DEBUG = true;
          TypeInference.DEBUG = true;
          SSAPRE.DEBUG = true;
          StackPRE.DEBUG = true;
          ExprPropagation.DEBUG = true;
          DeadCodeElimination.DEBUG = true;
          CodeGenerator.DB_OPT_STACK = true;

        } else if (args[i].equals("-trace")) {
          Main.TRACE = true;

        } else if (args[i].equals("-db")) {

          if (++i >= args.length) {
            System.err.println("** No debugging option specified");
            Main.usage();
          }

          if (args[i].equals("bc")) {
            CodeArray.DEBUG = true;

          } else if (args[i].equals("cfg")) {
            FlowGraph.DEBUG = true;

          } else if (args[i].equals("ssa")) {
            SSA.DEBUG = true;
            SSAGraph.DEBUG = true;

          } else if (args[i].equals("graphs")) {
            FlowGraph.DB_GRAPHS = true;

          } else if (args[i].startsWith("-")) {
            i--;

          } else {
            System.err.println("** Unknown debugging option: " + args[i]);
            Main.usage();
          }

        } else if (args[i].equals("-debugvf")) {
          ValueFolding.DUMP = true;

        } else if (args[i].equals("-debugbc")) {
          BloatContext.DEBUG = true;

        } else if (args[i].equals("-help")) {
          Main.usage();

        } else if (args[i].equals("-noanno")) {
          Main.ANNO = false;

        } else if (args[i].equals("-anno")) {
          Main.ANNO = true;

        } else if (args[i].equals("-print-flow-graph")) {
          FlowGraph.PRINT_GRAPH = true;

        } else if (args[i].equals("-preserve-debug")) {
          MethodEditor.PRESERVE_DEBUG = true;

        } else if (args[i].equals("-nouse-stack-vars")) {
          Tree.USE_STACK = false;

        } else if (args[i].equals("-use-stack-vars")) {
          Tree.USE_STACK = true;

        } else if (args[i].equals("-unique-handlers")) {
          MethodEditor.UNIQUE_HANDLERS = true;

        } else if (args[i].equals("-nocompact-array-init")) {
          Main.COMPACT_ARRAY_INIT = false;

        } else if (args[i].equals("-compact-array-init")) {
          Main.COMPACT_ARRAY_INIT = true;

        } else if (args[i].equals("-nostack-alloc")) {
          Main.STACK_ALLOC = false;

        } else if (args[i].equals("-stack-alloc")) {
          Main.STACK_ALLOC = true;

        } else if (args[i].equals("-no-verify")) {
          Main.VERIFY = false;

        } else if (args[i].equals("-peel-loops")) {
          if (++i >= args.length) {
            Main.usage();
          }

          final String n = args[i];

          if (n.equals("all")) {
            FlowGraph.PEEL_LOOPS_LEVEL = FlowGraph.PEEL_ALL_LOOPS;

          } else {
            try {
              FlowGraph.PEEL_LOOPS_LEVEL = Integer.parseInt(n);

              if (FlowGraph.PEEL_LOOPS_LEVEL < 0) {
                Main.usage();
              }
            } catch (final NumberFormatException ex) {
              Main.usage();
            }
          }

        } else if (args[i].equals("-color")) {
          Liveness.UNIQUE = false;

        } else if (args[i].equals("-nocolor")) {
          Liveness.UNIQUE = true;

        } else if (args[i].equals("-only-method")) {
          if (++i >= args.length) {
            Main.usage();
          }

          Main.METHOD = args[i];

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

          final String classpath = args[i];
          Main.loader.setClassPath(classpath);

        } else if (args[i].equals("-classpath/p")) {
          if (++i >= args.length) {
            Main.usage();
          }

          final String classpath = args[i];
          Main.loader.prependClassPath(classpath);

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

          String pkg = args[i];

          // Account for class file name on command line
          if (pkg.endsWith(".class")) {
            pkg = pkg.substring(0, pkg.lastIndexOf('.'));
          }

          Main.SKIP.add(pkg.replace('.', '/'));

        } else if (args[i].equals("-only")) {
          if (++i >= args.length) {
            Main.usage();
          }

          String pkg = args[i];

          // Account for class file name on command line
          if (pkg.endsWith(".class")) {
            pkg = pkg.substring(0, pkg.lastIndexOf('.'));
          }

          Main.ONLY.add(pkg.replace('.', '/'));

        } else if (args[i].equals("-nodce")) {
          Main.DCE = false;

        } else if (args[i].equals("-noprop")) {
          Main.PROP = false;

        } else if (args[i].equals("-noappre")) {
          SSAPRE.NO_ACCESS_PATHS = true;

        } else if (args[i].equals("-nopre")) {
          Main.PRE = false;

        } else if (args[i].equals("-dce")) {
          Main.DCE = true;

        } else if (args[i].equals("-prop")) {
          Main.PROP = true;

        } else if (args[i].equals("-appre")) {
          SSAPRE.NO_ACCESS_PATHS = false;

        } else if (args[i].equals("-pre")) {
          Main.PRE = true;

        } else if (args[i].equals("-closure")) {
          Main.CLOSURE = true;

        } else if (args[i].equals("-opt-stack-1")) {
          Main.OPT_STACK_1 = true;
          CodeGenerator.OPT_STACK = true;

        } else if (args[i].equals("-opt-stack-2")) {
          Main.OPT_STACK_2 = true;
          MethodEditor.OPT_STACK_2 = true;

        } else if (args[i].equals("-diva")) {
          Main.DIVA = true;

        } else if (args[i].equals("-no-thread")) {
          SSAPRE.NO_THREAD = true;

        } else if (args[i].equals("-no-precise")) {
          SSAPRE.NO_PRECISE = true;

        } else if (args[i].equals("-relax-loading")) {
          ClassHierarchy.RELAX = true;

        } else if (args[i].equals("-f") || args[i].equals("-force")) {
          Main.FORCE = true;

        } else if (args[i].startsWith("-")) {
          System.err.println("No such option: " + args[i]);
          Main.usage();

        } else if (i == args.length - 1) {
          // Last argument is the name of the output directory

          final File f = new File(args[i]);

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

          if (!f.exists()) {
            f.mkdirs();
          }

          if (!f.exists()) {
            System.err.println("Couldn't create directory: " + f.getPath());
            System.exit(2);
          }

          // Tell class loader to put optimized classes in f directory
          Main.loader.setOutputDir(f);
          gotdir = true;
        } else {
          // The argument must be a class name...
          classes.add(args[i]);
        }
      }

      if (!gotdir) {
        System.err.println("No output directory specified");
        Main.usage();
      }

      if (classes.size() == 0) {
        System.err.println("** No classes specified");
        Main.usage();
      }

      // Use the CachingBloatingContext
      Main.context = new CachingBloatContext(Main.loader, classes, Main.CLOSURE);

      boolean errors = false;

      final Iterator iter = classes.iterator();

      // Now that we've parsed the command line, load the classes into the
      // class loader
      while (iter.hasNext()) {
        final String name = (String) iter.next();

        try {
          Main.context.loadClass(name);

        } catch (final ClassNotFoundException ex) {
          System.err.println("Couldn't find class: " + ex.getMessage());

          errors = true;
        }
      }

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

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

        // Edit only the classes that were specified on the command line

        while (e.hasNext()) {
          final String name = (String) e.next();
          Main.editClass(name);
        }
      } else {
        // Edit all the classes in the class file editor and their
        // superclasses

        classes = null;

        if (Main.TRACE) {
          System.out.println("Computing closure " + Main.dateFormat.format(new Date()));
        }

        final Iterator e = Main.context.getHierarchy().classes().iterator();

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

          if (t.isObject()) {
            Main.editClass(t.className());
          }
        }
      }
    } catch (final ExceptionInInitializerError ex) {
      ex.printStackTrace();
      System.out.println(ex.getException());
    }
  }