+++ /dev/null
-// Copyright (C) 2004 Brian Alliet
-
-// Based on NanoGoat by Adam Megacz
-
-// Copyright (C) 2004 Adam Megacz <adam@ibex.org> all rights reserved.
-//
-// You may modify, copy, and redistribute this code under the terms of
-// the GNU Library Public License version 2.1, with the exception of
-// the portion of clause 6a after the semicolon (aka the "obnoxious
-// relink clause")
-
-package com.brian_web.gcclass;
-
-import java.util.*;
-import java.io.*;
-
-import org.apache.bcel.Constants;
-import org.apache.bcel.util.*;
-import org.apache.bcel.generic.*;
-import org.apache.bcel.classfile.*;
-
-public class GCClass {
- private static final String[] PRE_REF = {
- "java.lang.Thread.run",
- "java.security.PrivilegedAction.run"
- };
-
- // NOTE: This doesn't mean these classes are ignored alltogether
- // failures to resolve them are just ignored
- private static final String[] IGNORED_METHODS = {
- "java.net.SocketImpl.setOption(ILjava/lang/Object;)V",
- "java.net.SocketImpl.getOption(I)Ljava/lang/Object;",
- "java.awt.geom.*",
- "apple.awt.*",
- "java.security.*"
- };
-
- private static final String[] IGNORED_FIELDS = {
- "java.io.ObjectInputStream.SUBCLASS_IMPLEMENTATION_PERMISSION"
- };
-
- private static final String[] NO_OUTPUT = { "java", "javax", "sun", "com.sun", "apple", "com.apple" };
-
-
- public static void main(String[] args) throws Exception {
- if(args.length < 3) {
- System.err.println("Usage GCClass classpath outdir entrypoint1 ... [ entrypoint n]");
- System.exit(1);
- }
- GCClass gc = new GCClass(args[0]);
- for(int i=2;i<args.length;i++) {
- if(args[i].startsWith("hint:"))
- gc.parseHint(args[i].substring(5));
- else
- gc.referenceMethod(args[i]);
- }
- gc.go();
- gc.dump(new File(args[1]));
- }
-
- private final Repository repo;
- private final Vector work = new Vector();
- private final Hashtable completed = new Hashtable();
- private final Hashtable references = new Hashtable();
- private final Hashtable instansiated = new Hashtable();
- private final Hashtable hints = new Hashtable();
-
- public GCClass(String classpath) throws ClassNotFoundException {
- if(classpath.startsWith("="))
- classpath = classpath.substring(1);
- else
- classpath = ClassPath.SYSTEM_CLASS_PATH + File.pathSeparator + classpath;
- repo = SyntheticRepository.getInstance(new ClassPath(classpath));
- for(int i=0;i<PRE_REF.length;i++) {
- try {
- referenceMethod(PRE_REF[i]);
- } catch(ClassNotFoundException e) {
- System.err.println("WARNING: Couldn't preref: " + PRE_REF[i]);
- }
- }
- }
-
- private Hashtable classRefHash(JavaClass c) { return classRefHash(new ObjectType(c.getClassName())); }
- private Hashtable classRefHash(ObjectType c) {
- Hashtable h = (Hashtable) references.get(c);
- if(h == null) references.put(c,h=new Hashtable());
- return h;
- }
-
- public final ObjectType referenceClass(JavaClass c) { return referenceClass(c.getClassName()); }
- public final ObjectType referenceClass(String s) { return referenceClass(new ObjectType(s)); }
- public final ObjectType referenceClass(Type t) {
- if(t instanceof ObjectType) return referenceClass((ObjectType)t);
- return null;
- }
-
- public final ObjectType referenceClass(ObjectType t) {
- classRefHash(t);
- return t;
- }
-
- public void referenceMethod(String s) throws ClassNotFoundException {
- int p = s.lastIndexOf('.');
- if(p == -1) throw new IllegalArgumentException("invalid class/method string");
- String cs = s.substring(0,p);
- String ms = s.substring(p+1);
- boolean skip = false;
-
- if(cs.startsWith("-")) { cs = cs.substring(1); skip = true; }
-
- if(!skip && (ms.equals("*") || ms.equals("<init>")))
- instansiated.put(new ObjectType(cs),Boolean.TRUE);
-
- JavaClass c = repoGet(cs);
- Method[] methods = c.getMethods();
- for(int i=0;i<methods.length;i++) {
- if(ms.equals("*") || methods[i].getName().equals(ms)) {
- MethodRef mr = new MethodRef(c,methods[i]);
- if(skip) completed.put(mr,Boolean.TRUE);
- else referenceMethod(mr);
- }
- }
- }
-
- public void parseHint(String s) throws ClassNotFoundException {
- int p = s.indexOf(':');
- if(p == -1) throw new IllegalArgumentException("invalid hint");
- String cms = s.substring(0,p);
- String hint = s.substring(p+1);
- p = cms.lastIndexOf('.');
- if(p == -1) throw new IllegalArgumentException("invalid hint");
- String cs = cms.substring(0,p);
- String ms = cms.substring(p+1);
-
- JavaClass c = repoGet(cs);
- Method[] methods = c.getMethods();
- for(int i=0;i<methods.length;i++) {
- if(ms.equals("*") || methods[i].getName().equals(ms)) {
- MethodRef mr = new MethodRef(c,methods[i]);
- Vector v = (Vector) hints.get(mr);
- if(v == null) hints.put(mr,v=new Vector());
- v.add(hint);
- }
- }
- }
-
- private final void referenceMethod(MethodRef m) {
- if(completed.get(m) != null) return;
-
- if(m.c.getClassName().startsWith("[")) {
- completed.put(m,Boolean.TRUE);
- return;
- }
-
- Hashtable h = classRefHash(m.c);
- h.put(m,Boolean.TRUE);
- work.add(m);
-
- referenceClass(m.ret);
- for(int i=0;i<m.args.length;i++) referenceClass(m.args[i]);
- }
-
- private final void referenceField(FieldRef f) throws ClassNotFoundException {
- if(completed.get(f) != null) return;
-
- Hashtable h = classRefHash(f.c);
- h.put(f,Boolean.TRUE);
-
- // process(FieldRef) doesn't create much work so we don't bother queuing it
- process(f);
-
- referenceClass(f.ftype);
- }
-
- private Hashtable repoCache = new Hashtable();
- private JavaClass repoGet(ObjectType t) throws ClassNotFoundException { return repoGet(t.getClassName()); }
- private JavaClass repoGet(String s) throws ClassNotFoundException {
- Object o = repoCache.get(s);
- if(o == null) repoCache.put(s,o = repo.loadClass(s));
- return (JavaClass) o;
- }
-
- public void go() throws Exn {
- while(work.size() != 0) {
- while(work.size() != 0) {
- MethodRef mr = (MethodRef) work.remove(work.size()-1);
- try {
- process(mr);
- } catch(ClassNotFoundException e) {
- e.printStackTrace();
- String refBy = mr.refBy == null ? "unknown" : mr.refBy.toString();
- throw new Exn("ERROR: " + refBy + " references " + mr + " which cannot be found");
- }
- }
- try {
- fixup();
- } catch(ClassNotFoundException e) {
- e.printStackTrace();
- throw new Exn("ClassNotFoundException in fixup");
- }
- }
- }
-
- private void fixup() throws ClassNotFoundException {
- for(Enumeration e = references.keys(); e.hasMoreElements(); ) {
- ObjectType t = (ObjectType) e.nextElement();
- JavaClass c = repoGet(t);
- Hashtable refs = (Hashtable) references.get(t);
-
- if(c == null) continue;
-
- // add a ref to clinit if any fields/methods are referenced
- if(refs.size() != 0) {
- MethodRef clinit = new MethodRef(t,"<clinit>",Type.VOID,Type.NO_ARGS);
- if(findMethod(c,clinit) != null) referenceMethod(clinit);
- }
-
- Method[] methods = c.getMethods();
- JavaClass[] supers = c.getSuperClasses();
- JavaClass[] interfaces = c.getInterfaces();
-
- // If a subclass can be instansiated all its superclasses also can
- if(instansiated.get(t) != null) {
- for(int i=0;i<supers.length;i++) {
- ObjectType st = new ObjectType(supers[i].getClassName());
- if(instansiated.get(st) != null) break;
- instansiated.put(st, Boolean.TRUE);
- }
- }
-
- // If a subclass is referenced all is superclasses also are
- for(int i=0;i<supers.length;i++) referenceClass(supers[i]);
-
- // Go though each method and look for method references a
- // superclass or interfaces version of the method, references them
- // result in references to us
- for(int i=0;methods != null && i<methods.length;i++) {
- MethodRef mr = new MethodRef(c,methods[i]);
- if(refs.get(mr) != null) continue;
- for(int j=0;j<supers.length;j++) {
- MethodRef smr = new MethodRef(supers[j],methods[i]);
- Hashtable srefs = classRefHash(supers[j]);
- if(srefs.get(smr) != null) referenceMethod(mr);
-
- JavaClass[] interfaces2 = supers[j].getInterfaces();
- for(int k=0;interfaces2 != null && k<interfaces2.length;k++) {
- MethodRef imr = new MethodRef(interfaces2[k],methods[i]);
- Hashtable irefs = classRefHash(interfaces2[k]);
- if(irefs.get(imr) != null) referenceMethod(mr);
- }
- }
- for(int j=0;interfaces != null && j<interfaces.length;j++) {
- MethodRef imr = new MethodRef(interfaces[j],methods[i]);
- Hashtable irefs = classRefHash(interfaces[j]);
- if(irefs.get(imr) != null) referenceMethod(mr);
- }
- }
- }
- }
-
- private Hashtable cpgCache = new Hashtable();
- private void process(MethodRef mr) throws Exn, ClassNotFoundException {
- if(completed.get(mr) != null) return;
- completed.put(mr,Boolean.TRUE);
-
- //System.err.println("Processing " + mr + "...");
-
- JavaClass c = repoGet(mr.c.toString());
-
- // interfaces can only have a clinit method - every other method has no definition
- if(!c.isClass() && !mr.name.equals("<clinit>")) return;
-
- Method m = findMethod(c,mr);
- if(m == null) {
- JavaClass supers[] = c.getSuperClasses();
- for(int i=0;i<supers.length;i++) {
- m = findMethod(supers[i],mr);
- if(m != null) { referenceMethod(new MethodRef(supers[i],m)); return; }
- }
- String sig = mr.toString();
- for(int i=0;i<IGNORED_METHODS.length;i++) {
- String pat = IGNORED_METHODS[i];
- if(pat.endsWith("*") ? sig.startsWith(pat.substring(0,pat.length()-1)) : sig.equals(pat)) return;
- }
- throw new ClassNotFoundException("" + mr + " not found (but the class was)");
- }
-
- Code code = m.getCode();
- if(code == null) return;
-
- ConstantPoolGen cpg = (ConstantPoolGen) cpgCache.get(c);
- if(cpg == null) cpgCache.put(c,cpg=new ConstantPoolGen(c.getConstantPool()));
-
- InstructionList insnList = new InstructionList(code.getCode());
- Instruction[] insns = insnList.getInstructions();
-
- for(int n=0;n<insns.length;n++) {
- Instruction i = insns[n];
- if(i instanceof NEW)
- instansiated.put(((CPInstruction)i).getType(cpg),Boolean.TRUE);
- if(i instanceof ANEWARRAY || i instanceof CHECKCAST || i instanceof INSTANCEOF || i instanceof MULTIANEWARRAY || i instanceof NEW)
- referenceClass(((CPInstruction)i).getType(cpg));
- else if(i instanceof FieldInstruction) // GETFIED, GETSTATIC, PUTFIELD, PUTSTATIC
- referenceField(new FieldRef((FieldInstruction)i,cpg));
- else if(i instanceof InvokeInstruction) // INVOKESTATIC, INVOKEVIRTUAL, INVOKESPECIAL
- referenceMethod(new MethodRef((InvokeInstruction)i,cpg,mr));
- }
-
- if(hints.get(mr) != null) {
- Vector v = (Vector) hints.get(mr);
- for(int i=0;i<v.size();i++) referenceMethod((String) v.elementAt(i));
- }
- }
-
- private void process(FieldRef fr) throws ClassNotFoundException {
- if(completed.get(fr) != null) return;
- completed.put(fr,Boolean.TRUE);
-
- JavaClass c = repoGet(fr.c.toString());
- Field f = findField(c,fr);
- if(f == null) {
- JavaClass supers[] = c.getSuperClasses();
- for(int i=0;i<supers.length;i++) {
- f = findField(supers[i],fr);
- if(f != null) { referenceField(new FieldRef(supers[i],f)); return; }
- }
- String sig = fr.toString();
- for(int i=0;i<IGNORED_FIELDS.length;i++) {
- String pat = IGNORED_FIELDS[i];
- if(pat.endsWith("*") ? sig.startsWith(pat.substring(0,pat.length()-1)) : sig.equals(pat)) return;
- }
- throw new ClassNotFoundException("" + fr + " not found (but the class was)");
- }
- /* nothing to do */
- }
-
- private static Method findMethod(JavaClass c, MethodRef mr) {
- Method[] ms = c.getMethods();
- for(int i=0;i<ms.length;i++) {
- Method m = ms[i];
- if(m.getName().equals(mr.name) && m.getReturnType().equals(mr.ret) && Arrays.equals(m.getArgumentTypes(),mr.args))
- return m;
- }
- return null;
- }
-
- private static Field findField(JavaClass c, FieldRef fr) {
- Field[] fs = c.getFields();
- for(int i=0;i<fs.length;i++) {
- Field f = fs[i];
- if(f.getName().equals(fr.name) && f.getType().equals(fr.ftype))
- return f;
- }
- return null;
- }
-
- public void dump(File outdir) throws IOException, ClassNotFoundException {
- if(!outdir.isDirectory()) throw new IOException("" + outdir + " is not a directory");
- OUTER: for(Enumeration e = references.keys(); e.hasMoreElements(); ) {
- ObjectType t = (ObjectType) e.nextElement();
- String name = t.getClassName();
- for(int i=0;i<NO_OUTPUT.length;i++) if(name.startsWith(NO_OUTPUT[i])) continue OUTER;
- Hashtable refs = (Hashtable) references.get(t);
- JavaClass c = repoGet(t.getClassName());
- if(c == null) continue;
- boolean staticOnly = c.isClass() && instansiated.get(t) == null;
- File cf = new File(outdir,t.getClassName().replace('.',File.separatorChar) + ".class");
- cf.getParentFile().mkdirs();
- dumpClass(c,refs,staticOnly,cf);
- }
- }
-
- private void dumpClass(JavaClass c, Hashtable refs, boolean staticOnly, File file) throws IOException {
- ClassGen oldCG = new ClassGen(c);
- ConstantPoolGen oldCP = oldCG.getConstantPool();
-
- ConstantPoolGen cp = new ConstantPoolGen();
- ClassGen cg = new ClassGen(c.getClassName(),c.getSuperclassName(),c.getSourceFileName(),c.getAccessFlags(),c.getInterfaceNames(),cp);
-
- Method[] methods= oldCG.getMethods();
- for(int i=0;i<methods.length;i++) {
- Method m = methods[i];
- MethodRef mr = new MethodRef(c,m);
- if((staticOnly && !m.isStatic()) || refs.get(mr) == null) {
- System.err.println("Removing method " + mr);
- if(true) {
- InstructionFactory fac = new InstructionFactory(cg,cg.getConstantPool());
- InstructionList il = new InstructionList();
- MethodGen mg = new MethodGen(m.getAccessFlags(),m.getReturnType(),m.getArgumentTypes(),null,m.getName(),c.getClassName(),il,cp);
- il.append(fac.createNew("java.lang.UnsatisfiedLinkError"));
- il.append(InstructionConstants.DUP);
- if(false) {
- il.append(new PUSH(cg.getConstantPool(),"" + mr + " has been pruned"));
- il.append(fac.createInvoke("java.lang.UnsatisfiedLinkError","<init>",Type.VOID, new Type[]{Type.STRING},Constants.INVOKESPECIAL));
- } else {
- il.append(fac.createInvoke("java.lang.UnsatisfiedLinkError","<init>",Type.VOID,Type.NO_ARGS,Constants.INVOKESPECIAL));
- }
- il.append(InstructionConstants.ATHROW);
- mg.setMaxStack();
- mg.setMaxLocals();
- cg.addMethod(mg.getMethod());
- }
- } else {
- MethodGen mg = new MethodGen(m,cg.getClassName(),oldCP);
- mg.setConstantPool(cp);
- if(mg.getInstructionList() != null) mg.getInstructionList().replaceConstantPool(oldCP, cp);
-
- Attribute[] attrs = m.getAttributes();
- for(int j=0;j<attrs.length;j++) {
- Attribute a = attrs[j];
- if(a instanceof Code || a instanceof ExceptionTable) continue;
- mg.removeAttribute(a);
- Constant con = oldCP.getConstant(a.getNameIndex());
- a.setNameIndex(cp.addConstant(con,oldCP));
- mg.addAttribute(a);
- }
-
- mg.removeLineNumbers();
- mg.removeLocalVariables();
- cg.addMethod(mg.getMethod());
- }
- }
-
- Field[] fields = c.getFields();
- for(int i=0;i<fields.length;i++) {
- Field f = fields[i];
- FieldRef fr = new FieldRef(c,f);
- if(refs.get(fr) == null) {
- System.err.println("Removing field " + fr);
- } else {
- //System.err.println("Keeping field " + fr);
- FieldGen fg = new FieldGen(f.getAccessFlags(),f.getType(),f.getName(),cp);
- Attribute[] attrs = f.getAttributes();
- for(int j=0;j<attrs.length;j++) {
- if(attrs[j] instanceof ConstantValue) {
- ConstantObject co = (ConstantObject) oldCP.getConstant(((ConstantValue)attrs[i]).getConstantValueIndex());
- Object o = co.getConstantValue(oldCP.getConstantPool());
- if(co instanceof ConstantLong) fg.setInitValue(((Number)o).longValue());
- else if(co instanceof ConstantInteger) fg.setInitValue(((Number)o).intValue());
- else if(co instanceof ConstantFloat) fg.setInitValue(((Number)o).floatValue());
- else if(co instanceof ConstantDouble) fg.setInitValue(((Number)o).floatValue());
- else if(co instanceof ConstantString) fg.setInitValue((String)o);
- else throw new Error("should never happen");
- } else {
- Attribute a = attrs[j];
- Constant con = oldCP.getConstant(a.getNameIndex());
- a.setNameIndex(cp.addConstant(con,oldCP));
- //System.err.println("Adding attribute: " + attrs[j]);
- fg.addAttribute(a);
- }
- }
- /*if(f.getConstantValue() != null) throw new Error("this might be broken");
- FieldGen fg = new FieldGen(f.getAccessFlags(),f.getType(),f.getName(),cp);*/
- cg.addField(fg.getField());
- }
- }
-
- JavaClass n = cg.getJavaClass();
- n.dump(file);
- }
-
- public static class Exn extends Exception { public Exn(String s) { super(s); } }
-
- private static class MethodRef {
- ObjectType c;
- String name;
- Type ret;
- Type[] args;
- MethodRef refBy;
-
- public MethodRef(JavaClass c, Method m) {
- this(new ObjectType(c.getClassName()),m.getName(),m.getReturnType(),m.getArgumentTypes());
- }
-
- public MethodRef(InvokeInstruction i, ConstantPoolGen cp, MethodRef refBy) {
- this(i.getClassType(cp),i.getMethodName(cp),i.getReturnType(cp),i.getArgumentTypes(cp));
- this.refBy = refBy;
- }
-
- public MethodRef(ObjectType c, String name, Type ret, Type[] args) { this.c = c; this.name = name; this.ret = ret; this.args = args; }
-
- public boolean equals(Object o_) {
- if(!(o_ instanceof MethodRef)) return false;
- MethodRef o = (MethodRef)o_;
- boolean r = name.equals(o.name) && c.equals(o.c) && ret.equals(o.ret) && Arrays.equals(args,o.args);
- return r;
- }
- // FIXME: ArrayType.java in BCEL doesn't properly implement hashCode()
- public int hashCode() {
- int hc = name.hashCode() ^ c.hashCode(); //^ ret.hashCode();
- //for(int i=0;i<args.length;i++) hc ^= args[i].hashCode();
- return hc;
- }
- public String toString() { return c.toString() + "." + name + Type.getMethodSignature(ret,args); }
- }
-
- private static class FieldRef {
- ObjectType c;
- String name;
- Type ftype;
- MethodRef refBy;
-
- public FieldRef(JavaClass c, Field f) {
- this(new ObjectType(c.getClassName()),f.getName(),f.getType());
- }
-
- public FieldRef(FieldInstruction i, ConstantPoolGen cp) {
- this(i.getClassType(cp),i.getFieldName(cp),i.getFieldType(cp));
- }
- public FieldRef(ObjectType c, String name, Type ftype) { this.c = c; this.name = name; this.ftype = ftype; }
-
- public boolean equals(Object o_) {
- if(!(o_ instanceof FieldRef)) return false;
- FieldRef o = (FieldRef)o_;
- return name.equals(o.name) && c.equals(o.c);
- }
- public int hashCode() { return name.hashCode() ^ c.hashCode(); }
- public String toString() { return c.toString() + "." + name; }
- }
-}
projects / org.ibex.gcclass.git / blobdiff