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