/**
* 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);
}
/**
* 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());
}
}