+++ /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 BytecodePruner {
-
- public static final boolean deleteMethods = false;
- public static SyntheticRepository repo = null;
- public static HashSet dest = new HashSet();
- public static String outdir = ".";
- public static Hashtable subclasses = new Hashtable();
- public static int level = 0;
-
- public BytecodePruner() { }
-
- 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 loadField(String classAndMethodName) throws Exception {
- String classname = classAndMethodName.substring(0, classAndMethodName.lastIndexOf('.'));
- String methodname = classAndMethodName.substring(classAndMethodName.lastIndexOf('.') + 1);
- visitJavaClass(repo.loadClass(classname));
- Field[] meths = repo.loadClass(classname).getFields();
- for(int i=0; i<meths.length; i++)
- if (meths[i].getName().equals(methodname))
- visitJavaField(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;
- if (s.length >= 3 && s[1].equals("-o")) { outdir = s[2]; start += 2; }
- repo = SyntheticRepository.getInstance(new ClassPath(s[0]));
-
- BytecodePruner bcp = new BytecodePruner();
- 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]);
- }
- } catch (Exception e) {
- System.out.println("WARNING: couldn't load class for " + s[i]);
- }
- }
-
- 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.loadAllMethods("java.util.Hashtable$HashIterator");
- bcp.loadMethod("java.util.SimpleTimeZone.useDaylightTime");
- bcp.visitJavaClass(repo.loadClass("gnu.gcj.runtime.FinalizerThread"));
- bcp.visitJavaClass(repo.loadClass("gnu.gcj.runtime.FirstThread"));
-
- bcp.loadMethod("java.lang.Thread.run"); // we call start(), but the VM calls run()...
- bcp.loadMethod("java.lang.ref.Reference.enqueue"); // the GC calls this directly
- bcp.loadAllMethods("gnu.gcj.runtime.StringBuffer"); // the compiler emits calls directly to this class
- bcp.loadAllMethods("gnu.gcj.convert.Input_UTF8"); // retrieved via reflection
- bcp.loadAllMethods("gnu.gcj.convert.Output_UTF8"); // retrieved via reflection
-
- bcp.loadAllMethods("gnu.gcj.protocol.http.Handler");
- bcp.loadAllMethods("gnu.gcj.protocol.file.Handler");
- bcp.loadAllMethods("gnu.gcj.protocol.core.Handler");
- bcp.loadAllMethods("gnu.gcj.protocol.jar.Handler");
-
- // to ensure we get all the stuff that might be called from CNI
- bcp.loadAllMethods("org.ibex.plat.Linux");
- bcp.loadAllMethods("org.ibex.plat.X11");
- bcp.loadAllMethods("org.ibex.plat.GCJ");
- bcp.loadAllMethods("org.ibex.plat.POSIX");
- bcp.loadAllMethods("org.ibex.plat.X11$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...");
- StringTokenizer st = new StringTokenizer(s[0], ":");
- while(st.hasMoreTokens()) {
- ZipFile zf = new ZipFile(st.nextToken());
- Enumeration e = zf.entries();
- while(e.hasMoreElements()) {
- String ss = ((ZipEntry)e.nextElement()).getName();
- if (!ss.endsWith(".class")) continue;
- ss = ss.substring(0, ss.length() - 6);
- ss = ss.replace('/', '.');
- dump(repo.loadClass(ss));
- }
- }
- }
-
- public static void dump(JavaClass clazz) 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 constructed = false;
- Method[] methods = getMethods(clazz);
- for(int i=0; i<methods.length; i++)
- if (dest.contains(methods[i]) && methods[i].getName().equals("<init>"))
- constructed = 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()) {
- System.out.println(" pruning field " + clazz.getClassName() + "." + fields[i].getName());
- cg.removeField(fields[i]);
- }
- /* -- there's really no point to this --
- if (!constructed && !fields[i].isStatic()) {
- System.out.println(" unconstructed: pruning field " + clazz.getClassName() + "." + fields[i].getName());
- cg.removeField(fields[i]);
- }
- */
- }
-
- int numMethods = 0;
- boolean good = false;
- for(int i=0; i<methods.length; i++) {
- if (dest.contains(methods[i]) && (constructed || !methods[i].isStatic())) {
- if (!methods[i].getName().equals("<clinit>")) good = true;
- } else {
- if (methods[i].getCode() == null) {
- System.out.println(" empty codeblock: " + clazz.getClassName() + "." + methods[i].getName());
- } else {
- System.out.println(" pruning " +(constructed?"":"unconstructed")+ " method " +
- clazz.getClassName() + "." + methods[i].getName());
- // FIXME: try deleteMethods
- 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();
- }
- }
- }
-
- if (!good) {
- 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());
- }
- new File(outdir + "/" + new File(clazz.getClassName().replace('.', '/')).getParent()).mkdirs();
- cg.getJavaClass().dump(outdir + "/" + clazz.getClassName().replace('.', '/') + ".class");
- }
-
- 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;
-
- // 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;
-
- if (dest.contains(method)) return;
- dest.add(method);
-
- if (method.isStatic()) loadMethod(jc.getClassName() + ".<clinit>");
-
- level += 2;
- for(int i=0; i<level; i++) System.out.print(" ");
- ConstantPoolGen cpg = new ConstantPoolGen(method.getConstantPool());
- System.out.println(jc.getClassName() + "." + getMethodSignature(method, cpg));
- markMethodInSubclasses(jc, method, cpg);
- if (method.getCode() == null) { level -= 2; return; }
- byte[] code = method.getCode().getCode();
- InstructionList il = new InstructionList(code);
- Instruction[] instructions = il.getInstructions();
- for(int i=0; i<instructions.length; i++){
- Instruction instr = instructions[i];
- 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) {
- try { load(((TypedInstruction)instr).getType(cpg)); } catch (Exception e) { /* DELIBERATE */ }
- }
- if (instr instanceof NEW) {
- for(int j=0; j<level; j++) System.out.print(" ");
- 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]);
- }
- 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());
- }
- }
- level -= 2;
-
- // FIXME: move this to the top
- 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]);
- }
- }
-
- public void visitJavaField(Field field) throws Exception {
- if (!dest.contains(field)) dest.add(field);
- }
-
- public void visitJavaClass(JavaClass clazz) throws Exception {
- if (dest.contains(clazz)) return;
- dest.add(clazz);
-
- ConstantPoolGen cpg = new ConstantPoolGen(clazz.getConstantPool());
- 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]);
- else {
- Type t = fields[i].getType();
- if (t instanceof ObjectType) load(t);
- }
- }
-
- Method[] methods = getMethods(clazz);
- for(int i=0; i<methods.length; i++) {
- //if (methods[i].getName().equals("<clinit>")) visitJavaMethod(clazz, methods[i]);
- if (methods[i].getName().equals("equals")) visitJavaMethod(clazz, methods[i]);
- if (methods[i].getName().equals("hashCode")) visitJavaMethod(clazz, methods[i]);
- if (methods[i].getName().equals("finalize")) visitJavaMethod(clazz, methods[i]);
- if (methods[i].getName().equals("clone")) visitJavaMethod(clazz, methods[i]);
- if (methods[i].getName().equals("toString")) visitJavaMethod(clazz, methods[i]);
- }
- }
-
- public void markMethodInSubclasses(JavaClass c, Method m, JavaClass subclass, ConstantPoolGen cpg) throws Exception {
- if (m.isStatic()) 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;
- 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])) 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])) 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