4 import java.util.zip.*;
5 import org.apache.bcel.*;
6 import org.apache.bcel.generic.*;
7 import org.apache.bcel.classfile.*;
8 import org.apache.bcel.util.*;
10 public class NanoGoat {
12 public static final boolean deleteMethods = false;
13 public static SyntheticRepository repo = null;
14 public static HashSet dest = new HashSet();
15 public static HashSet constructed = new HashSet();
16 public static String outdir = ".";
17 public static Hashtable subclasses = new Hashtable();
18 public static Hashtable uponconstruction = new Hashtable();
19 public static Hashtable mark_if_constructed = new Hashtable();
20 public static int level = 0;
24 public void loadAllMethods(String classname) throws Exception {
25 visitJavaClass(repo.loadClass(classname));
26 Method[] meths = getMethods(repo.loadClass(classname));
27 for(int i=0; i<meths.length; i++)
28 visitJavaMethod(repo.loadClass(classname), meths[i]);
31 public void loadAllStaticMethods(String classname) throws Exception {
32 visitJavaClass(repo.loadClass(classname));
33 Method[] meths = getMethods(repo.loadClass(classname));
34 for(int i=0; i<meths.length; i++)
35 if (meths[i].isStatic())
36 visitJavaMethod(repo.loadClass(classname), meths[i]);
39 public void loadMethod(String classAndMethodName) throws Exception {
40 String classname = classAndMethodName.substring(0, classAndMethodName.lastIndexOf('.'));
41 String methodname = classAndMethodName.substring(classAndMethodName.lastIndexOf('.') + 1);
42 if (classname.endsWith("." + methodname)) methodname = "<init>";
43 visitJavaClass(repo.loadClass(classname));
44 Method[] meths = getMethods(repo.loadClass(classname));
45 for(int i=0; i<meths.length; i++)
46 if (meths[i].getName().equals(methodname))
47 visitJavaMethod(repo.loadClass(classname), meths[i]);
49 public static void main(String[] s) throws Exception {
51 repo = SyntheticRepository.getInstance(new ClassPath(s[0]));
53 NanoGoat bcp = new NanoGoat();
54 for(int i=start; i<s.length; i++) {
56 if (s[i].endsWith(".class")) {
57 bcp.visitJavaClass(repo.loadClass(s[i].substring(0, s[i].length() - 6)));
59 JavaClass cl = repo.loadClass(s[i].substring(0, s[i].lastIndexOf('.')));;
60 bcp.visitJavaClass(cl);
62 Field[] fields = cl.getFields();
63 for(int j=0; j<fields.length; j++) {
64 if (fields[j].getName().equals(s[i].substring(s[i].lastIndexOf('.') + 1)))
65 bcp.visitJavaField(fields[j], cl);
68 } catch (Exception e) {
69 System.out.println("WARNING: couldn't load class for " + s[i]);
74 System.out.println("\n\n======================================================================\n");
76 // we call start(), but the VM calls run()...
77 bcp.loadMethod("java.lang.Thread.run");
78 bcp.loadAllMethods("java.lang.SecurityContext");
79 bcp.loadAllMethods("java.lang.ThreadDeath");
80 bcp.loadMethod("java.lang.Thread.run"); // we call start(), but the VM calls run()...
81 bcp.loadMethod("java.lang.ref.Reference.enqueue"); // the GC calls this directly
82 bcp.loadAllMethods("gnu.gcj.runtime.StringBuffer"); // the compiler emits calls directly to this class
83 bcp.loadAllMethods("gnu.gcj.convert.Input_UTF8"); // retrieved via reflection
84 bcp.loadAllMethods("gnu.gcj.convert.Output_UTF8"); // retrieved via reflection
85 bcp.loadMethod("gnu.gcj.convert.BytesToUnicode.done"); // called by natString
86 bcp.loadAllStaticMethods("java.lang.reflect.Modifier"); // used all over natClass...
88 // the Interpreter.run() method's switchblock is too complex...
89 bcp.loadAllMethods("org.ibex.js.Interpreter$TryMarker");
90 bcp.loadAllMethods("org.ibex.js.Interpreter$CatchMarker");
91 bcp.loadAllMethods("org.ibex.js.Interpreter$LoopMarker");
92 bcp.loadAllMethods("org.ibex.js.Interpreter$FinallyData");
93 bcp.loadAllMethods("org.ibex.js.Interpreter$CallMarker");
94 bcp.loadAllMethods("org.ibex.js.Interpreter");
95 bcp.loadAllMethods("org.ibex.js.Interpreter$1");
96 bcp.loadAllMethods("org.ibex.js.Interpreter$Stub");
97 bcp.loadAllMethods("org.ibex.js.Trap$TrapScope");
98 bcp.loadMethod("org.ibex.js.JSScope.top");
99 bcp.loadAllMethods("org.ibex.Picture$1");
100 bcp.loadAllMethods("org.ibex.Ibex$Blessing");
101 bcp.loadAllMethods("org.ibex.util.SSL$entropySpinner");
102 bcp.loadAllMethods("org.ibex.HTTP$HTTPInputStream");
103 bcp.visitJavaClass(repo.loadClass("org.ibex.util.SSL"));
105 bcp.loadAllMethods("java.util.Hashtable$HashIterator");
106 bcp.loadMethod("java.util.SimpleTimeZone.useDaylightTime");
107 bcp.visitJavaClass(repo.loadClass("gnu.gcj.runtime.FinalizerThread"));
108 bcp.visitJavaClass(repo.loadClass("gnu.gcj.runtime.FirstThread"));
110 // to ensure we get all the stuff that might be called from CNI
111 bcp.loadAllMethods("org.ibex.plat.Linux");
112 bcp.loadAllMethods("org.ibex.plat.X11");
113 bcp.loadAllMethods("org.ibex.plat.GCJ");
114 bcp.loadAllMethods("org.ibex.plat.POSIX");
115 bcp.loadAllMethods("org.ibex.plat.X11$X11Surface");
116 bcp.loadAllMethods("org.ibex.plat.X11$X11PixelBuffer");
117 bcp.loadAllMethods("org.ibex.plat.X11$X11Picture");
118 bcp.loadAllMethods("org.ibex.Surface");
119 bcp.loadAllMethods("org.ibex.Picture");
120 bcp.loadAllMethods("org.ibex.PixelBuffer");
122 // primary entry point
123 bcp.loadMethod("org.ibex.plat.Linux.main");
124 System.out.println();
126 System.out.println("Dumping...");
127 ZipFile zf = new ZipFile(s[0]);
128 ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(s[0] + ".tmp"));
129 Enumeration e = zf.entries();
130 while(e.hasMoreElements()) {
131 ZipEntry ze = ((ZipEntry)e.nextElement());
132 String ss = ze.getName();
133 if (!ss.endsWith(".class")) continue;
134 ss = ss.substring(0, ss.length() - 6);
135 ss = ss.replace('/', '.');
136 dump(repo.loadClass(ss), zos);
140 new File(s[0] + ".tmp").renameTo(new File(s[0] + ".pruned"));
143 public static void dump(JavaClass clazz, ZipOutputStream zos) throws Exception {
144 if (!dest.contains(clazz)) return;
146 ConstantPoolGen newcpg = new ConstantPoolGen(clazz.getConstantPool());
147 ClassGen cg = new ClassGen(clazz);
148 InstructionFactory factory = new InstructionFactory(cg, newcpg);
151 cg.setConstantPool(newcpg);
153 boolean isconstructed = false;
154 Method[] methods = getMethods(clazz);
155 for(int i=0; i<methods.length; i++)
156 if (dest.contains(methods[i]) && methods[i].getName().equals("<init>"))
157 isconstructed = true;
159 // we can only prune static fields (to avoid altering object layout, which is hardcoded into
160 // CNI code), but that's okay since instance fields don't contribute to binary size
161 Field[] fields = clazz.getFields();
162 for(int i=0; i<fields.length; i++) {
163 if ((!dest.contains(fields[i]) && fields[i].isStatic()) ||
164 ((!(constructed.contains(clazz))) && !fields[i].isStatic())) {
165 System.out.println(" pruning field " + clazz.getClassName() + "." + fields[i].getName());
166 // FIXME this confuses gcj in jar-at-a-time mode
167 //cg.removeField(fields[i]);
172 boolean good = false;
173 for(int i=0; i<methods.length; i++) {
174 if (dest.contains(methods[i]) && (isconstructed || methods[i].isStatic())) {
177 if (methods[i].getCode() == null) {
178 System.out.println(" empty codeblock: " + clazz.getClassName() + "." + methods[i].getName());
180 System.out.println(" pruning " +(isconstructed?"":"unconstructed")+ " method " +
181 clazz.getClassName() + "." + methods[i].getName());
182 if (deleteMethods) { cg.removeMethod(methods[i]); continue; }
183 MethodGen mg = new MethodGen(methods[i], clazz.getClassName(), newcpg);
184 mg.removeExceptions();
185 InstructionList il = new InstructionList();
186 mg.setInstructionList(il);
187 InstructionHandle ih_0 = il.append(factory.createNew("java.lang.UnsatisfiedLinkError"));
188 il.append(InstructionConstants.DUP);
189 il.append(factory.createInvoke("java.lang.UnsatisfiedLinkError",
190 "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
191 il.append(InstructionConstants.ATHROW);
194 mg.removeExceptions();
195 mg.removeLocalVariables();
196 mg.removeExceptionHandlers();
197 mg.removeLineNumbers();
198 cg.replaceMethod(methods[i], mg.getMethod());
204 // FIXME: chain up to superclass' <clinit>... that might remove the need for this hack
205 // FIXME: gcj compiling in jar-at-a-time mode can't be convinced to let classes outside the jar override
206 // the ones inside the jar
209 if (!good && !clazz.isAbstract() && !clazz.isInterface()) {
210 System.out.println("DROPPING " + clazz.getClassName());
211 JavaClass[] ifaces = clazz.getInterfaces();
212 String[] ifacestrings = new String[ifaces.length];
213 for(int i=0; i<ifaces.length; i++) ifacestrings[i] = ifaces[i].getClassName();
214 cg = new ClassGen(clazz.getClassName(),
215 clazz.getSuperClass().getClassName(),
217 clazz.getAccessFlags(),
221 System.out.println("dumping " + clazz.getClassName());
223 FilterOutputStream noclose = new FilterOutputStream(zos) { public void close() throws IOException { flush(); } };
224 zos.putNextEntry(new ZipEntry(clazz.getClassName().replace('.', '/')+".class"));
225 cg.getJavaClass().dump(noclose);
229 public JavaClass sig2class(String sig) throws Exception {
230 if (sig == null) return null;
231 while (sig.length() > 0 && (sig.charAt(0) == 'L' || sig.charAt(0) == '[')) {
232 if (sig.charAt(0) == 'L') sig = sig.substring(1, sig.length() - 1);
233 else if (sig.charAt(0) == '[') sig = sig.substring(1, sig.length());
235 if (sig.length() <= 1) return null;
236 if (sig.equals("<null object>")) return null;
237 if (sig.startsWith("<return address")) return null;
238 return repo.loadClass(sig);
240 public void load(String sig) throws Exception {
241 if (sig == null) return;
242 while (sig.length() > 0 && (sig.charAt(0) == 'L' || sig.charAt(0) == '[')) {
243 if (sig.charAt(0) == 'L') sig = sig.substring(1, sig.length() - 1);
244 else if (sig.charAt(0) == '[') sig = sig.substring(1, sig.length());
246 if (sig.length() <= 1) return;
247 if (sig.equals("<null object>")) return;
248 if (sig.startsWith("<return address")) return;
249 visitJavaClass(repo.loadClass(sig));
251 public void load(Type t) throws Exception {
252 if (t == null) return;
253 if (t instanceof ArrayType) load(((ArrayType)t).getElementType());
254 if (!(t instanceof ObjectType)) return;
255 load(((ObjectType)t).getClassName());
258 public String getMethodSignature(Method m, ConstantPoolGen cpg) throws Exception { return m.getName() + m.getSignature(); }
259 public String getMethodSignature(InvokeInstruction ii, ConstantPoolGen cpg) throws Exception {
261 Type[] argtypes = ii.getArgumentTypes(cpg);
262 for(int j=0; j<argtypes.length; j++) sig += argtypes[j].getSignature();
263 return ii.getMethodName(cpg) + "(" + sig + ")" + ii.getReturnType(cpg).getSignature();
266 public void visitJavaMethod(JavaClass jc, Method method) throws Exception {
268 if (jc.getClassName().indexOf("SharedLib") != -1) return;
269 if (jc.getClassName().indexOf("Datagram") != -1) return;
270 if (jc.getClassName().startsWith("java.io.Object")) return;
271 if (jc.getClassName().startsWith("java.util.jar.")) return;
272 if (jc.getClassName().startsWith("java.net.Inet6")) return;
274 // gcj bug; gcj can't compile this method from a .class file input; I have no idea why
275 if (jc.getClassName().equals("java.lang.System") && method.getName().equals("runFinalizersOnExit")) return;
277 // we know these can't be constructed
278 if (method.getName().equals("<init>") && jc.getClassName().startsWith("java.lang.reflect.")) return;
280 if (dest.contains(method)) return;
283 if (method.getName().equals("<clinit>") && jc.getSuperClass() != null)
284 loadMethod(jc.getSuperClass().getClassName() + ".<clinit>");
286 if (method.isStatic() || method.getName().equals("<init>")) loadMethod(jc.getClassName() + ".<clinit>");
287 if (method.getName().equals("<init>")) {
288 // FIXME: generalize to all perinstancemethods
290 HashSet hs = (HashSet)uponconstruction.get(jc);
292 Iterator it = hs.iterator();
293 while(it.hasNext()) visitJavaMethod(jc, (Method)it.next());
295 loadMethod(jc.getClassName() + ".equals");
296 loadMethod(jc.getClassName() + ".hashCode");
297 loadMethod(jc.getClassName() + ".toString");
298 loadMethod(jc.getClassName() + ".finalize");
299 loadMethod(jc.getClassName() + ".clone");
302 ConstantPoolGen cpg = new ConstantPoolGen(method.getConstantPool());
303 if (!method.isStatic() && !constructed.contains(jc)) {
304 HashSet hs = (HashSet)uponconstruction.get(jc);
305 if (hs == null) uponconstruction.put(jc, hs = new HashSet());
307 markMethodInSubclasses(jc, method, cpg);
313 for(int i=0; i<level; i++) System.out.print(" ");
314 System.out.print(jc.getClassName() + "." + getMethodSignature(method, cpg));
315 markMethodInSubclasses(jc, method, cpg);
316 if (method.getCode() == null) { System.out.println(); level -= 2; return; }
317 byte[] code = method.getCode().getCode();
318 InstructionList il = new InstructionList(code);
319 InstructionHandle[] instructions = il.getInstructionHandles();
320 System.out.println(" [" + instructions.length + " instructions]");
321 for(int i=0; i<instructions.length; i++){
322 Instruction instr = instructions[i].getInstruction();;
323 if (instr instanceof Select) {
324 InstructionHandle[] ih2 = ((Select)instr).getTargets();
325 InstructionHandle[] ih3 = new InstructionHandle[instructions.length + ih2.length];
326 System.arraycopy(instructions, 0, ih3, 0, instructions.length);
327 System.arraycopy(ih2, 0, ih3, instructions.length, ih2.length);
330 if (instr instanceof LoadClass) {
331 ObjectType ot = (ObjectType)((LoadClass)instr).getLoadClassType(cpg);
332 if (ot != null) loadMethod(ot.getClassName() + ".<clinit>");
334 if (instr instanceof CPInstruction) load(((CPInstruction)instr).getType(cpg));
335 if (instr instanceof TypedInstruction) load(((TypedInstruction)instr).getType(cpg));
336 if (instr instanceof NEW) loadMethod(((NEW)instr).getLoadClassType(cpg).getClassName() + ".<init>");
337 if (instr instanceof org.apache.bcel.generic.FieldOrMethod)
338 load(((org.apache.bcel.generic.FieldOrMethod)instr).getClassType(cpg));
339 if (instr instanceof org.apache.bcel.generic.FieldInstruction) {
340 load(((org.apache.bcel.generic.FieldInstruction)instr).getFieldType(cpg));
341 load(((org.apache.bcel.generic.FieldInstruction)instr).getType(cpg));
342 String fieldName = ((org.apache.bcel.generic.FieldInstruction)instr).getFieldName(cpg);
343 JavaClass jc2 = repo.loadClass(((ObjectType)((org.apache.bcel.generic.FieldInstruction)instr).
344 getLoadClassType(cpg)).getClassName());
345 Field[] fields = jc2.getFields();
346 for(int j=0; j<fields.length; j++) if (fields[j].getName().equals(fieldName)) visitJavaField(fields[j], jc2);
348 if (instr instanceof InvokeInstruction) {
349 InvokeInstruction ii = (InvokeInstruction)instr;
350 String ii_sig = getMethodSignature(ii, cpg);
351 JavaClass c = sig2class(ii.getLoadClassType(cpg).getSignature());
353 load(ii.getType(cpg));
354 Method[] meths = getMethods(c);
355 boolean good = false;
356 for(int i2=0; i2<meths.length; i2++) {
357 if (getMethodSignature(meths[i2], cpg).equals(ii_sig)) {
358 visitJavaMethod(c, meths[i2]);
363 if (!good) throw new Exception("couldn't find method " + getMethodSignature(ii, cpg) + " in " + c.getClassName());
366 Type[] argtypes = method.getArgumentTypes();
367 for(int i=0; i<argtypes.length; i++) load(argtypes[i]);
368 if (method.getExceptionTable() != null) {
369 String[] exntypes = method.getExceptionTable().getExceptionNames();
370 for(int i=0; i<exntypes.length; i++) load(exntypes[i]);
375 public void visitJavaField(Field field, JavaClass clazz) throws Exception {
376 if (dest.contains(field)) return;
378 if (field.isStatic()) loadMethod(clazz.getClassName() + ".<clinit>");
381 public void visitJavaClass(JavaClass clazz) throws Exception {
382 if (dest.contains(clazz)) return;
385 ConstantPoolGen cpg = new ConstantPoolGen(clazz.getConstantPool());
387 for(int i=0; i<level; i++) System.out.print(" ");
388 System.out.println(clazz.getClassName() + ".class");
390 JavaClass superclass = clazz.getSuperClass();
391 for(JavaClass sup = superclass; sup != null; sup = sup.getSuperClass()) {
392 if (subclasses.get(sup) == null) subclasses.put(sup, new HashSet());
393 ((HashSet)subclasses.get(sup)).add(clazz);
395 JavaClass[] interfaces = clazz.getAllInterfaces();
396 for(int i=0; i<interfaces.length; i++) {
397 if (subclasses.get(interfaces[i]) == null) subclasses.put(interfaces[i], new HashSet());
398 ((HashSet)subclasses.get(interfaces[i])).add(clazz);
401 for(JavaClass sup = superclass; sup != null; sup = sup.getSuperClass()) {
403 remarkMethods(sup, clazz, cpg);
405 for(int i=0; i<interfaces.length; i++) {
406 visitJavaClass(interfaces[i]);
407 remarkMethods(interfaces[i], clazz, cpg);
410 Field[] fields = clazz.getFields();
411 for(int i=0; i<fields.length; i++) {
412 if (!fields[i].isStatic()) visitJavaField(fields[i], clazz);
414 Type t = fields[i].getType();
415 if (t instanceof ObjectType) load(t);
421 public void markMethodInSubclasses(JavaClass c, Method m, JavaClass subclass, ConstantPoolGen cpg) throws Exception {
422 if (m.isStatic()) return;
423 if (m.getName().equals("<init>")) return;
424 if (m.getName().equals("equals")) return;
425 if (m.getName().equals("hashCode")) return;
426 if (m.getName().equals("clone")) return;
427 if (m.getName().equals("finalize")) return;
428 if (m.getName().equals("toString")) return;
429 String sig = getMethodSignature(m, cpg);
430 Method[] submethods = getMethods(subclass);
431 for(int j=0; j<submethods.length; j++)
432 if (getMethodSignature(submethods[j], cpg).equals(sig))
433 visitJavaMethod(subclass, submethods[j]);
435 public void markMethodInSubclasses(JavaClass c, Method m, ConstantPoolGen cpg) throws Exception {
436 if (m.isStatic()) return;
437 if (m.getName().equals("<init>")) return;
438 HashSet s = (HashSet)subclasses.get(c);
439 if (s == null) return;
440 Object[] subclasses = s.toArray();
441 for(int i=0; i<subclasses.length; i++) {
442 JavaClass subclass = (JavaClass)subclasses[i];
443 if (subclass == c) continue;
444 markMethodInSubclasses(c, m, subclass, cpg);
448 public void remarkMethods(JavaClass c, ConstantPoolGen cpg) throws Exception {
449 Method[] meths =getMethods(c);
450 for(int j=0; j<meths.length; j++)
451 if (dest.contains(meths[j]) ||
452 (uponconstruction.get(c) != null && ((HashSet)uponconstruction.get(c)).contains(meths[j])))
453 markMethodInSubclasses(c, meths[j], cpg);
456 public void remarkMethods(JavaClass c, JavaClass target, ConstantPoolGen cpg) throws Exception {
457 Method[] meths = getMethods(c);
458 for(int j=0; j<meths.length; j++)
459 if (dest.contains(meths[j]) ||
460 (uponconstruction.get(c) != null && ((HashSet)uponconstruction.get(c)).contains(meths[j])))
461 markMethodInSubclasses(c, meths[j], target, cpg);
464 public static Hashtable methodsHashtable = new Hashtable();
465 public static Method[] getMethods(JavaClass c) {
466 Method[] ret = (Method[])methodsHashtable.get(c);
467 if (ret == null) methodsHashtable.put(c, ret = c.getMethods());