--- /dev/null
+package org.ibex.util;
+import java.util.*;
+import java.io.*;
+import java.util.zip.*;
+import org.apache.bcel.*;
+import org.apache.bcel.generic.*;
+import org.apache.bcel.classfile.*;
+import org.apache.bcel.util.*;
+
+public class NanoGoat {
+
+ public static final boolean deleteMethods = false;
+ public static SyntheticRepository repo = null;
+ public static HashSet dest = new HashSet();
+ public static HashSet constructed = new HashSet();
+ public static String outdir = ".";
+ public static Hashtable subclasses = new Hashtable();
+ public static Hashtable uponconstruction = new Hashtable();
+ public static Hashtable mark_if_constructed = new Hashtable();
+ public static int level = 0;
+
+ public NanoGoat() { }
+
+ public void loadAllMethods(String classname) throws Exception {
+ visitJavaClass(repo.loadClass(classname));
+ Method[] meths = getMethods(repo.loadClass(classname));
+ for(int i=0; i<meths.length; i++)
+ visitJavaMethod(repo.loadClass(classname), meths[i]);
+ }
+
+ public void loadAllStaticMethods(String classname) throws Exception {
+ visitJavaClass(repo.loadClass(classname));
+ Method[] meths = getMethods(repo.loadClass(classname));
+ for(int i=0; i<meths.length; i++)
+ if (meths[i].isStatic())
+ visitJavaMethod(repo.loadClass(classname), meths[i]);
+ }
+
+ public void loadMethod(String classAndMethodName) throws Exception {
+ String classname = classAndMethodName.substring(0, classAndMethodName.lastIndexOf('.'));
+ String methodname = classAndMethodName.substring(classAndMethodName.lastIndexOf('.') + 1);
+ if (classname.endsWith("." + methodname)) methodname = "<init>";
+ visitJavaClass(repo.loadClass(classname));
+ Method[] meths = getMethods(repo.loadClass(classname));
+ for(int i=0; i<meths.length; i++)
+ if (meths[i].getName().equals(methodname))
+ visitJavaMethod(repo.loadClass(classname), meths[i]);
+ }
+ public static void main(String[] s) throws Exception {
+ int start = 1;
+ repo = SyntheticRepository.getInstance(new ClassPath(s[0]));
+
+ NanoGoat bcp = new NanoGoat();
+ for(int i=start; i<s.length; i++) {
+ try {
+ if (s[i].endsWith(".class")) {
+ bcp.visitJavaClass(repo.loadClass(s[i].substring(0, s[i].length() - 6)));
+ } else {
+ JavaClass cl = repo.loadClass(s[i].substring(0, s[i].lastIndexOf('.')));;
+ bcp.visitJavaClass(cl);
+ bcp.loadMethod(s[i]);
+ Field[] fields = cl.getFields();
+ for(int j=0; j<fields.length; j++) {
+ if (fields[j].getName().equals(s[i].substring(s[i].lastIndexOf('.') + 1)))
+ bcp.visitJavaField(fields[j], cl);
+ }
+ }
+ } catch (Exception e) {
+ System.out.println("WARNING: couldn't load class for " + s[i]);
+ e.printStackTrace();
+ }
+ }
+
+ System.out.println("\n\n======================================================================\n");
+
+ // we call start(), but the VM calls run()...
+ bcp.loadMethod("java.lang.Thread.run");
+ bcp.loadAllMethods("java.lang.SecurityContext");
+ bcp.loadAllMethods("java.lang.ThreadDeath");
+ bcp.loadMethod("java.lang.Thread.run"); // we call start(), but the VM calls run()...
+ bcp.loadMethod("java.lang.ref.Reference.enqueue"); // the GC calls this directly
+ bcp.loadAllMethods("gnu.gcj.runtime.StringBuffer"); // the compiler emits calls directly to this class
+ bcp.loadAllMethods("gnu.gcj.convert.Input_UTF8"); // retrieved via reflection
+ bcp.loadAllMethods("gnu.gcj.convert.Output_UTF8"); // retrieved via reflection
+ bcp.loadMethod("gnu.gcj.convert.BytesToUnicode.done"); // called by natString
+ bcp.loadAllStaticMethods("java.lang.reflect.Modifier"); // used all over natClass...
+
+ // the Interpreter.run() method's switchblock is too complex...
+ bcp.loadAllMethods("org.ibex.js.Interpreter$TryMarker");
+ bcp.loadAllMethods("org.ibex.js.Interpreter$CatchMarker");
+ bcp.loadAllMethods("org.ibex.js.Interpreter$LoopMarker");
+ bcp.loadAllMethods("org.ibex.js.Interpreter$FinallyData");
+ bcp.loadAllMethods("org.ibex.js.Interpreter$CallMarker");
+ bcp.loadAllMethods("org.ibex.js.Interpreter");
+ bcp.loadAllMethods("org.ibex.js.Interpreter$1");
+ bcp.loadAllMethods("org.ibex.js.Interpreter$Stub");
+ bcp.loadAllMethods("org.ibex.js.Trap$TrapScope");
+ bcp.loadMethod("org.ibex.js.JSScope.top");
+ bcp.loadAllMethods("org.ibex.Picture$1");
+ bcp.loadAllMethods("org.ibex.Ibex$Blessing");
+ bcp.loadAllMethods("org.ibex.util.SSL$entropySpinner");
+ bcp.loadAllMethods("org.ibex.HTTP$HTTPInputStream");
+ bcp.visitJavaClass(repo.loadClass("org.ibex.util.SSL"));
+
+ bcp.loadAllMethods("java.util.Hashtable$HashIterator");
+ bcp.loadMethod("java.util.SimpleTimeZone.useDaylightTime");
+ bcp.visitJavaClass(repo.loadClass("gnu.gcj.runtime.FinalizerThread"));
+ bcp.visitJavaClass(repo.loadClass("gnu.gcj.runtime.FirstThread"));
+
+ // to ensure we get all the stuff that might be called from CNI
+ bcp.loadAllMethods("org.ibex.plat.Linux");
+ bcp.loadAllMethods("org.ibex.plat.X11");
+ bcp.loadAllMethods("org.ibex.plat.GCJ");
+ bcp.loadAllMethods("org.ibex.plat.POSIX");
+ bcp.loadAllMethods("org.ibex.plat.X11$X11Surface");
+ bcp.loadAllMethods("org.ibex.plat.X11$X11PixelBuffer");
+ bcp.loadAllMethods("org.ibex.plat.X11$X11Picture");
+ bcp.loadAllMethods("org.ibex.Surface");
+ bcp.loadAllMethods("org.ibex.Picture");
+ bcp.loadAllMethods("org.ibex.PixelBuffer");
+
+ // primary entry point
+ bcp.loadMethod("org.ibex.plat.Linux.main");
+ System.out.println();
+
+ System.out.println("Dumping...");
+ ZipFile zf = new ZipFile(s[0]);
+ ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(s[0] + ".tmp"));
+ Enumeration e = zf.entries();
+ while(e.hasMoreElements()) {
+ ZipEntry ze = ((ZipEntry)e.nextElement());
+ String ss = ze.getName();
+ if (!ss.endsWith(".class")) continue;
+ ss = ss.substring(0, ss.length() - 6);
+ ss = ss.replace('/', '.');
+ dump(repo.loadClass(ss), zos);
+ }
+ zos.close();
+ zf.close();
+ new File(s[0] + ".tmp").renameTo(new File(s[0] + ".pruned"));
+ }
+
+ public static void dump(JavaClass clazz, ZipOutputStream zos) throws Exception {
+ if (!dest.contains(clazz)) return;
+
+ ConstantPoolGen newcpg = new ConstantPoolGen(clazz.getConstantPool());
+ ClassGen cg = new ClassGen(clazz);
+ InstructionFactory factory = new InstructionFactory(cg, newcpg);
+ cg.setMajor(46);
+ cg.setMinor(0);
+ cg.setConstantPool(newcpg);
+
+ boolean isconstructed = false;
+ Method[] methods = getMethods(clazz);
+ for(int i=0; i<methods.length; i++)
+ if (dest.contains(methods[i]) && methods[i].getName().equals("<init>"))
+ isconstructed = true;
+
+ // we can only prune static fields (to avoid altering object layout, which is hardcoded into
+ // CNI code), but that's okay since instance fields don't contribute to binary size
+ Field[] fields = clazz.getFields();
+ for(int i=0; i<fields.length; i++) {
+ if ((!dest.contains(fields[i]) && fields[i].isStatic()) ||
+ ((!(constructed.contains(clazz))) && !fields[i].isStatic())) {
+ System.out.println(" pruning field " + clazz.getClassName() + "." + fields[i].getName());
+ // FIXME this confuses gcj in jar-at-a-time mode
+ //cg.removeField(fields[i]);
+ }
+ }
+
+ int numMethods = 0;
+ boolean good = false;
+ for(int i=0; i<methods.length; i++) {
+ if (dest.contains(methods[i]) && (isconstructed || methods[i].isStatic())) {
+ good = true;
+ } else {
+ if (methods[i].getCode() == null) {
+ System.out.println(" empty codeblock: " + clazz.getClassName() + "." + methods[i].getName());
+ } else {
+ System.out.println(" pruning " +(isconstructed?"":"unconstructed")+ " method " +
+ clazz.getClassName() + "." + methods[i].getName());
+ if (deleteMethods) { cg.removeMethod(methods[i]); continue; }
+ MethodGen mg = new MethodGen(methods[i], clazz.getClassName(), newcpg);
+ mg.removeExceptions();
+ InstructionList il = new InstructionList();
+ mg.setInstructionList(il);
+ InstructionHandle ih_0 = il.append(factory.createNew("java.lang.UnsatisfiedLinkError"));
+ il.append(InstructionConstants.DUP);
+ il.append(factory.createInvoke("java.lang.UnsatisfiedLinkError",
+ "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
+ il.append(InstructionConstants.ATHROW);
+ mg.setMaxStack();
+ mg.setMaxLocals();
+ mg.removeExceptions();
+ mg.removeLocalVariables();
+ mg.removeExceptionHandlers();
+ mg.removeLineNumbers();
+ cg.replaceMethod(methods[i], mg.getMethod());
+ il.dispose();
+ }
+ }
+ }
+
+ // FIXME: chain up to superclass' <clinit>... that might remove the need for this hack
+ // FIXME: gcj compiling in jar-at-a-time mode can't be convinced to let classes outside the jar override
+ // the ones inside the jar
+ good = true;
+
+ if (!good && !clazz.isAbstract() && !clazz.isInterface()) {
+ System.out.println("DROPPING " + clazz.getClassName());
+ JavaClass[] ifaces = clazz.getInterfaces();
+ String[] ifacestrings = new String[ifaces.length];
+ for(int i=0; i<ifaces.length; i++) ifacestrings[i] = ifaces[i].getClassName();
+ cg = new ClassGen(clazz.getClassName(),
+ clazz.getSuperClass().getClassName(),
+ clazz.getFileName(),
+ clazz.getAccessFlags(),
+ ifacestrings,
+ newcpg);
+ } else {
+ System.out.println("dumping " + clazz.getClassName());
+ }
+ FilterOutputStream noclose = new FilterOutputStream(zos) { public void close() throws IOException { flush(); } };
+ zos.putNextEntry(new ZipEntry(clazz.getClassName().replace('.', '/')+".class"));
+ cg.getJavaClass().dump(noclose);
+ noclose.flush();
+ }
+
+ public JavaClass sig2class(String sig) throws Exception {
+ if (sig == null) return null;
+ while (sig.length() > 0 && (sig.charAt(0) == 'L' || sig.charAt(0) == '[')) {
+ if (sig.charAt(0) == 'L') sig = sig.substring(1, sig.length() - 1);
+ else if (sig.charAt(0) == '[') sig = sig.substring(1, sig.length());
+ }
+ if (sig.length() <= 1) return null;
+ if (sig.equals("<null object>")) return null;
+ if (sig.startsWith("<return address")) return null;
+ return repo.loadClass(sig);
+ }
+ public void load(String sig) throws Exception {
+ if (sig == null) return;
+ while (sig.length() > 0 && (sig.charAt(0) == 'L' || sig.charAt(0) == '[')) {
+ if (sig.charAt(0) == 'L') sig = sig.substring(1, sig.length() - 1);
+ else if (sig.charAt(0) == '[') sig = sig.substring(1, sig.length());
+ }
+ if (sig.length() <= 1) return;
+ if (sig.equals("<null object>")) return;
+ if (sig.startsWith("<return address")) return;
+ visitJavaClass(repo.loadClass(sig));
+ }
+ public void load(Type t) throws Exception {
+ if (t == null) return;
+ if (t instanceof ArrayType) load(((ArrayType)t).getElementType());
+ if (!(t instanceof ObjectType)) return;
+ load(((ObjectType)t).getClassName());
+ }
+
+ public String getMethodSignature(Method m, ConstantPoolGen cpg) throws Exception { return m.getName() + m.getSignature(); }
+ public String getMethodSignature(InvokeInstruction ii, ConstantPoolGen cpg) throws Exception {
+ String sig = "";
+ Type[] argtypes = ii.getArgumentTypes(cpg);
+ for(int j=0; j<argtypes.length; j++) sig += argtypes[j].getSignature();
+ return ii.getMethodName(cpg) + "(" + sig + ")" + ii.getReturnType(cpg).getSignature();
+ }
+
+ public void visitJavaMethod(JavaClass jc, Method method) throws Exception {
+ visitJavaClass(jc);
+ if (jc.getClassName().indexOf("SharedLib") != -1) return;
+ if (jc.getClassName().indexOf("Datagram") != -1) return;
+ if (jc.getClassName().startsWith("java.io.Object")) return;
+ if (jc.getClassName().startsWith("java.util.jar.")) return;
+ if (jc.getClassName().startsWith("java.net.Inet6")) return;
+
+ // gcj bug; gcj can't compile this method from a .class file input; I have no idea why
+ if (jc.getClassName().equals("java.lang.System") && method.getName().equals("runFinalizersOnExit")) return;
+
+ // we know these can't be constructed
+ if (method.getName().equals("<init>") && jc.getClassName().startsWith("java.lang.reflect.")) return;
+
+ if (dest.contains(method)) return;
+ dest.add(method);
+
+ if (method.getName().equals("<clinit>") && jc.getSuperClass() != null)
+ loadMethod(jc.getSuperClass().getClassName() + ".<clinit>");
+
+ if (method.isStatic() || method.getName().equals("<init>")) loadMethod(jc.getClassName() + ".<clinit>");
+ if (method.getName().equals("<init>")) {
+ // FIXME: generalize to all perinstancemethods
+ constructed.add(jc);
+ HashSet hs = (HashSet)uponconstruction.get(jc);
+ if (hs != null) {
+ Iterator it = hs.iterator();
+ while(it.hasNext()) visitJavaMethod(jc, (Method)it.next());
+ }
+ loadMethod(jc.getClassName() + ".equals");
+ loadMethod(jc.getClassName() + ".hashCode");
+ loadMethod(jc.getClassName() + ".toString");
+ loadMethod(jc.getClassName() + ".finalize");
+ loadMethod(jc.getClassName() + ".clone");
+ }
+
+ ConstantPoolGen cpg = new ConstantPoolGen(method.getConstantPool());
+ if (!method.isStatic() && !constructed.contains(jc)) {
+ HashSet hs = (HashSet)uponconstruction.get(jc);
+ if (hs == null) uponconstruction.put(jc, hs = new HashSet());
+ hs.add(method);
+ markMethodInSubclasses(jc, method, cpg);
+ dest.remove(method);
+ return;
+ }
+
+ level += 2;
+ for(int i=0; i<level; i++) System.out.print(" ");
+ System.out.print(jc.getClassName() + "." + getMethodSignature(method, cpg));
+ markMethodInSubclasses(jc, method, cpg);
+ if (method.getCode() == null) { System.out.println(); level -= 2; return; }
+ byte[] code = method.getCode().getCode();
+ InstructionList il = new InstructionList(code);
+ InstructionHandle[] instructions = il.getInstructionHandles();
+ System.out.println(" [" + instructions.length + " instructions]");
+ for(int i=0; i<instructions.length; i++){
+ Instruction instr = instructions[i].getInstruction();;
+ if (instr instanceof Select) {
+ InstructionHandle[] ih2 = ((Select)instr).getTargets();
+ InstructionHandle[] ih3 = new InstructionHandle[instructions.length + ih2.length];
+ System.arraycopy(instructions, 0, ih3, 0, instructions.length);
+ System.arraycopy(ih2, 0, ih3, instructions.length, ih2.length);
+ instructions = ih3;
+ }
+ if (instr instanceof LoadClass) {
+ ObjectType ot = (ObjectType)((LoadClass)instr).getLoadClassType(cpg);
+ if (ot != null) loadMethod(ot.getClassName() + ".<clinit>");
+ }
+ if (instr instanceof CPInstruction) load(((CPInstruction)instr).getType(cpg));
+ if (instr instanceof TypedInstruction) load(((TypedInstruction)instr).getType(cpg));
+ if (instr instanceof NEW) loadMethod(((NEW)instr).getLoadClassType(cpg).getClassName() + ".<init>");
+ if (instr instanceof org.apache.bcel.generic.FieldOrMethod)
+ load(((org.apache.bcel.generic.FieldOrMethod)instr).getClassType(cpg));
+ if (instr instanceof org.apache.bcel.generic.FieldInstruction) {
+ load(((org.apache.bcel.generic.FieldInstruction)instr).getFieldType(cpg));
+ load(((org.apache.bcel.generic.FieldInstruction)instr).getType(cpg));
+ String fieldName = ((org.apache.bcel.generic.FieldInstruction)instr).getFieldName(cpg);
+ JavaClass jc2 = repo.loadClass(((ObjectType)((org.apache.bcel.generic.FieldInstruction)instr).
+ getLoadClassType(cpg)).getClassName());
+ Field[] fields = jc2.getFields();
+ for(int j=0; j<fields.length; j++) if (fields[j].getName().equals(fieldName)) visitJavaField(fields[j], jc2);
+ }
+ if (instr instanceof InvokeInstruction) {
+ InvokeInstruction ii = (InvokeInstruction)instr;
+ String ii_sig = getMethodSignature(ii, cpg);
+ JavaClass c = sig2class(ii.getLoadClassType(cpg).getSignature());
+
+ load(ii.getType(cpg));
+ Method[] meths = getMethods(c);
+ boolean good = false;
+ for(int i2=0; i2<meths.length; i2++) {
+ if (getMethodSignature(meths[i2], cpg).equals(ii_sig)) {
+ visitJavaMethod(c, meths[i2]);
+ good = true;
+ break;
+ }
+ }
+ if (!good) throw new Exception("couldn't find method " + getMethodSignature(ii, cpg) + " in " + c.getClassName());
+ }
+ }
+ Type[] argtypes = method.getArgumentTypes();
+ for(int i=0; i<argtypes.length; i++) load(argtypes[i]);
+ if (method.getExceptionTable() != null) {
+ String[] exntypes = method.getExceptionTable().getExceptionNames();
+ for(int i=0; i<exntypes.length; i++) load(exntypes[i]);
+ }
+ level -= 2;
+ }
+
+ public void visitJavaField(Field field, JavaClass clazz) throws Exception {
+ if (dest.contains(field)) return;
+ dest.add(field);
+ if (field.isStatic()) loadMethod(clazz.getClassName() + ".<clinit>");
+ }
+
+ public void visitJavaClass(JavaClass clazz) throws Exception {
+ if (dest.contains(clazz)) return;
+ dest.add(clazz);
+
+ ConstantPoolGen cpg = new ConstantPoolGen(clazz.getConstantPool());
+ level += 2;
+ for(int i=0; i<level; i++) System.out.print(" ");
+ System.out.println(clazz.getClassName() + ".class");
+
+ JavaClass superclass = clazz.getSuperClass();
+ for(JavaClass sup = superclass; sup != null; sup = sup.getSuperClass()) {
+ if (subclasses.get(sup) == null) subclasses.put(sup, new HashSet());
+ ((HashSet)subclasses.get(sup)).add(clazz);
+ }
+ JavaClass[] interfaces = clazz.getAllInterfaces();
+ for(int i=0; i<interfaces.length; i++) {
+ if (subclasses.get(interfaces[i]) == null) subclasses.put(interfaces[i], new HashSet());
+ ((HashSet)subclasses.get(interfaces[i])).add(clazz);
+ }
+
+ for(JavaClass sup = superclass; sup != null; sup = sup.getSuperClass()) {
+ visitJavaClass(sup);
+ remarkMethods(sup, clazz, cpg);
+ }
+ for(int i=0; i<interfaces.length; i++) {
+ visitJavaClass(interfaces[i]);
+ remarkMethods(interfaces[i], clazz, cpg);
+ }
+
+ Field[] fields = clazz.getFields();
+ for(int i=0; i<fields.length; i++) {
+ if (!fields[i].isStatic()) visitJavaField(fields[i], clazz);
+ else {
+ Type t = fields[i].getType();
+ if (t instanceof ObjectType) load(t);
+ }
+ }
+ level -= 2;
+ }
+
+ public void markMethodInSubclasses(JavaClass c, Method m, JavaClass subclass, ConstantPoolGen cpg) throws Exception {
+ if (m.isStatic()) return;
+ if (m.getName().equals("<init>")) return;
+ if (m.getName().equals("equals")) return;
+ if (m.getName().equals("hashCode")) return;
+ if (m.getName().equals("clone")) return;
+ if (m.getName().equals("finalize")) return;
+ if (m.getName().equals("toString")) return;
+ String sig = getMethodSignature(m, cpg);
+ Method[] submethods = getMethods(subclass);
+ for(int j=0; j<submethods.length; j++)
+ if (getMethodSignature(submethods[j], cpg).equals(sig))
+ visitJavaMethod(subclass, submethods[j]);
+ }
+ public void markMethodInSubclasses(JavaClass c, Method m, ConstantPoolGen cpg) throws Exception {
+ if (m.isStatic()) return;
+ if (m.getName().equals("<init>")) return;
+ HashSet s = (HashSet)subclasses.get(c);
+ if (s == null) return;
+ Object[] subclasses = s.toArray();
+ for(int i=0; i<subclasses.length; i++) {
+ JavaClass subclass = (JavaClass)subclasses[i];
+ if (subclass == c) continue;
+ markMethodInSubclasses(c, m, subclass, cpg);
+ }
+ }
+
+ public void remarkMethods(JavaClass c, ConstantPoolGen cpg) throws Exception {
+ Method[] meths =getMethods(c);
+ for(int j=0; j<meths.length; j++)
+ if (dest.contains(meths[j]) ||
+ (uponconstruction.get(c) != null && ((HashSet)uponconstruction.get(c)).contains(meths[j])))
+ markMethodInSubclasses(c, meths[j], cpg);
+ }
+
+ public void remarkMethods(JavaClass c, JavaClass target, ConstantPoolGen cpg) throws Exception {
+ Method[] meths = getMethods(c);
+ for(int j=0; j<meths.length; j++)
+ if (dest.contains(meths[j]) ||
+ (uponconstruction.get(c) != null && ((HashSet)uponconstruction.get(c)).contains(meths[j])))
+ markMethodInSubclasses(c, meths[j], target, cpg);
+ }
+
+ public static Hashtable methodsHashtable = new Hashtable();
+ public static Method[] getMethods(JavaClass c) {
+ Method[] ret = (Method[])methodsHashtable.get(c);
+ if (ret == null) methodsHashtable.put(c, ret = c.getMethods());
+ return ret;
+ }
+
+}
projects / org.ibex.core.git / blobdiff