1 package org.ibex.classgen;
6 * a highly streamlined SSA-form intermediate representation of a
7 * sequence of JVM instructions; all stack manipulation is factored
10 public class JSSA extends MethodGen implements CGConst {
12 // Constructor //////////////////////////////////////////////////////////////////////////////
14 public JSSA(Type.Class c, DataInput in, ConstantPool cp) throws IOException {
16 local = new Expr[maxLocals];
17 stack = new Expr[maxStack];
18 for(int i=0; i<this.method.getNumArgs(); i++)
19 local[i] = new Argument("arg"+i, this.method.getArgType(i));
20 for(int i=0; i<size(); i++) {
22 Object arg = getArg(i);
23 Object o = addOp(op, arg);
31 public void debugBodyToString(StringBuffer sb) {
32 StringBuffer sb0 = new StringBuffer();
33 super.debugBodyToString(sb0);
34 StringTokenizer st = new StringTokenizer(sb0.toString(), "\n");
35 String[] lines = new String[st.countTokens()];
36 for(int i=0; i<lines.length; i++) lines[i] = st.nextToken();
37 for(int j=0; j<ofs[0]; j++) {
38 String s = " /* " + lines[j].trim();
39 while(s.length() < 50) s += " ";
44 for(int i=0; i<numOps; i++) {
45 String s = " /* " + lines[ofs[i]].trim();
46 while(s.length() < 50) s += " ";
48 s += ops[i].toString();
51 for(int j=ofs[i]+1; j<(i==numOps-1?size():ofs[i+1]); j++) {
52 s = " /* " + lines[j].trim();
53 while(s.length() < 50) s += " ";
61 private Object[] ops = new Object[65535];
62 private int[] ofs = new int[65535];
63 private int numOps = 0;
65 // Instance Data; used ONLY during constructor; then thrown away /////////////////////////////////////////////////
67 /** this models the JVM locals; it is only used for unwinding stack-ops into an SSA-tree, then thrown away */
68 private final Expr[] local;
70 /** this models the JVM stack; it is only used for unwinding stack-ops into an SSA-tree, then thrown away */
71 private final Expr[] stack;
73 /** JVM stack pointer */
76 private Expr push(Expr e) {
77 if(sp == stack.length-1) throw new IllegalStateException("stack overflow");
78 return stack[sp++] = e;
81 if(sp == 0) throw new IllegalStateException("stack underflow");
86 // SSA-node classes /////////////////////////////////////////////////////////////////////////////////////////
88 public final Expr VOID_EXPR = new Expr() {
89 public Type getType() { return Type.VOID; }
92 /** an purely imperative operation which does not generate data */
93 public abstract class Op {
94 //public abstract Op[] predecessors(); // not implemented yet
95 //public abstract Op[] successors(); // not implemented yet
96 public String toString() { return name(); }
98 String name = this.getClass().getName();
99 if (name.indexOf('$') != -1) name = name.substring(name.lastIndexOf('$')+1);
100 if (name.indexOf('.') != -1) name = name.substring(name.lastIndexOf('.')+1);
105 /** an operation which generates data */
106 public abstract class Expr extends Op {
107 //public abstract Expr[] contributors(); // not implemented yet
108 //public abstract Expr[] dependents(); // not implemented yet
110 /** every JSSA.Expr either remembers its type _OR_ knows how to figure it out (the latter is preferred to eliminate
111 * redundant information that could possibly "disagree" with itself -- this happened a LOT in Soot) */
112 public abstract Type getType();
116 * A "nondeterministic merge" -- for example when the first instruction in a loop reads from a local which could have been
117 * written to either by some instruction at the end of the previous iteration of the loop or by some instruction before
118 * the loop (on the first iteration).
120 public class Phi extends Expr {
121 private final Expr[] inputs;
122 public Phi(Expr[] inputs) {
123 this.inputs = new Expr[inputs.length];
124 System.arraycopy(inputs, 0, this.inputs, 0, inputs.length);
126 public Type getType() {
128 Type t = inputs[0].getType();
130 // FIXME: actually this should check type-unifiability... fe, the "type of null" unifies with any Type.Ref
131 for(int i=1; i<inputs.length; i++)
132 if (inputs[i].getType() != t)
133 throw new Error("Phi node with disagreeing types! Crisis!");
138 public class Argument extends Expr {
139 public final String name;
141 public Argument(String name, Type t) { this.name = name; this.t = t; }
142 public String toString() { return name; }
143 public Type getType() { return t; }
147 public class Not extends Expr {
150 if(e.getType() != Type.BOOLEAN) throw new IllegalArgumentException("not needs a boolean expression");
153 public Type getType() { return Type.BOOLEAN; }
154 public String toString() { return "!(" + e + ")"; }
157 public class Neg extends Expr {
160 if(!e.getType().isPrimitive()) throw new IllegalArgumentException("can only negate a primitive");
163 public Type getType() { return e.getType(); }
164 public String toString() { return "- (" + e + ")"; }
167 // Binary Operations //////////////////////////////////////////////////////////////////////////////
169 public abstract class BinExpr extends Expr {
170 public final Expr e1;
171 public final Expr e2;
172 private final String show;
173 public BinExpr(Expr e1, Expr e2, String show) { this.e1 = e1; this.e2 = e2; this.show = show; }
174 public String toString() {
175 // FEATURE: should we be doing some precedence stuff here? probably no worth it for debugging output
176 return "(" + e1 + show + e2 + ")";
180 public class Comparison extends BinExpr {
181 public Comparison(Expr e1, Expr e2, String show) { super(e1, e2, show); }
182 public Type getType() { return Type.BOOLEAN; }
185 public class Eq extends Comparison {
186 public Eq(Expr e1, Expr e2) {
188 if(e1.getType().isPrimitive() != e2.getType().isPrimitive())
189 throw new IllegalArgumentException("type mismatch");
190 if(e1.getType().isPrimitive() && e1.getType() != e2.getType())
191 throw new IllegalArgumentException("type mismatch");
192 // FEATURE: Check if we can compare these classes
197 public class PrimitiveComparison extends Comparison {
198 public PrimitiveComparison(Expr e1, Expr e2, String show) {
200 if(!e1.getType().isPrimitive() || e1.getType() != e2.getType()) throw new IllegalArgumentException("type mismatch");
204 public class Gt extends PrimitiveComparison { public Gt(Expr e1, Expr e2) { super(e1, e2, ">"); } }
205 public class Lt extends PrimitiveComparison { public Lt(Expr e1, Expr e2) { super(e1, e2, "<"); } }
206 public class Ge extends PrimitiveComparison { public Ge(Expr e1, Expr e2) { super(e1, e2, ">="); } }
207 public class Le extends PrimitiveComparison { public Le(Expr e1, Expr e2) { super(e1, e2, "<="); } }
209 // Math Operations //////////////////////////////////////////////////////////////////////////////
211 public class BinMath extends BinExpr {
212 public BinMath(Expr e1, Expr e2, String show) {
214 if(e1.getType() != e2.getType()) throw new IllegalArgumentException("types disagree");
216 public Type getType() { return e1.getType(); }
219 public class Add extends BinMath { public Add(Expr e, Expr e2) { super(e, e2, "+"); } }
220 public class Sub extends BinMath { public Sub(Expr e, Expr e2) { super(e, e2, "-"); } }
221 public class Mul extends BinMath { public Mul(Expr e, Expr e2) { super(e, e2, "*"); } }
222 public class Rem extends BinMath { public Rem(Expr e, Expr e2) { super(e, e2, "%"); } }
223 public class Div extends BinMath { public Div(Expr e, Expr e2) { super(e, e2, "/"); } }
224 public class And extends BinMath { public And(Expr e, Expr e2) { super(e, e2, "&"); } }
225 public class Or extends BinMath { public Or(Expr e, Expr e2) { super(e, e2, "|"); } }
226 public class Xor extends BinMath { public Xor(Expr e, Expr e2) { super(e, e2, "^"); } }
228 public class BitShiftExpr extends BinExpr {
229 public BitShiftExpr(Expr e1, Expr e2, String show) {
231 Type t = e1.getType();
232 if(t != Type.INT && t != Type.LONG) throw new IllegalArgumentException("type mismatch");
233 if(e2.getType() != Type.INT) throw new IllegalArgumentException("type mismatch");
235 public Type getType() { return e1.getType(); }
237 public class Shl extends BitShiftExpr { public Shl(Expr e, Expr e2) { super(e, e2, "<<"); } }
238 public class Shr extends BitShiftExpr { public Shr(Expr e, Expr e2) { super(e, e2, ">>"); } }
239 public class Ushr extends BitShiftExpr { public Ushr(Expr e, Expr e2) { super(e, e2, ">>>"); } }
241 // Other operations //////////////////////////////////////////////////////////////////////////////
243 public class Cast extends Expr {
246 public Cast(Expr e, Type t) {
247 if(e.getType().isRef() != t.isRef()) throw new IllegalArgumentException("invalid cast");
248 // FEATURE: Check that one is a subclass of the other if it is a ref
252 public Type getType() { return t; }
255 public class InstanceOf extends Expr {
258 public InstanceOf(Expr e, Type.Ref t) {
259 if(!e.getType().isRef()) throw new IllegalArgumentException("can't do an instanceof check on a non-ref");
263 public Type getType() { return Type.BOOLEAN; }
266 public class Throw extends Op {
268 public Throw(Expr e) {
269 if(!e.getType().isRef()) throw new IllegalArgumentException("can't throw a non ref");
270 // FEATURE: CHeck that it is a subclass of Throwable
275 public class Branch extends Op {
276 public Branch(Expr condition, Object destination) { }
277 public Branch(Label destination) { }
278 public Branch(MethodGen.Switch s) { }
281 public class Goto extends Branch { }
282 public class RET extends Branch { }
283 public class JSR extends Branch { public JSR(Label l) { super(l); } }
284 public class If extends Branch { }
286 /** represents a "returnaddr" pushed onto the stack */
287 public class Label extends Expr {
289 public Type getType() { throw new Error("attempted to call getType() on a Label"); }
290 public Label(Op op) { this.op = op; }
291 public Label(int i) { this.op = null; /* FIXME */ }
294 public class New extends Expr {
295 public final Type.Class t;
296 public Type getType() { return t; }
297 public New(Type.Class t) { this.t = t; }
300 public class NewArray extends Expr {
301 public final Type.Array t;
302 public final Expr[] dims;
303 public NewArray(Type.Array t, Expr[] dims) { this.t = t; this.dims = dims; }
304 public NewArray(Type.Array t, Expr dim) { this(t,new Expr[]{dim}); }
305 public Type getType() { return t; }
308 public class Return extends Op {
310 public Return() { this(VOID_EXPR); }
311 public Return(Expr e) { this.e = e; }
312 public String toString() { return e.getType() == Type.VOID ? "return" : ("return "+e.toString()); }
315 /** GETFIELD and GETSTATIC */
316 public class Get extends Expr {
317 final Type.Class.Field f;
319 public Type getType() { return f.getType(); }
320 public Get(Type.Class.Field f) { this(f, null); }
321 public Get(Type.Class.Field f, Expr e) { this.f = f; this.e = e; }
322 public String toString() {
326 : f.getDeclaringClass() == JSSA.this.method.getDeclaringClass()
332 /** PUTFIELD and PUTSTATIC */
333 public class Put extends Op {
334 final Type.Class.Field f;
337 public Put(Type.Class.Field f, Expr v) { this(f, v, null); }
338 public Put(Type.Class.Field f, Expr v, Expr e) { this.f = f; this.v = v; this.e = e; }
339 public String toString() {
343 : f.getDeclaringClass() == JSSA.this.method.getDeclaringClass()
345 : f.toString()) + " = " + v;
349 public class ArrayPut extends Op {
351 public ArrayPut(Expr e, Expr i, Expr v) { this.e = e; this.i = i; this.v = v; }
354 public class ArrayGet extends Expr {
356 public ArrayGet(Expr e, Expr i) { this.e = e; this.i = i; }
357 public Type getType() { return e.getType().asArray().getElementType(); }
360 public class ArrayLength extends Expr {
362 public ArrayLength(Expr e) { this.e = e; }
363 public Type getType() { return Type.INT; }
366 public abstract class Invoke extends Expr {
367 public final Expr[] arguments;
368 public final Type.Class.Method method;
369 protected Invoke(Type.Class.Method m, Expr[] a) { this.arguments = a; this.method = m; }
371 public Type getType() { return method.getReturnType(); }
372 protected void args(StringBuffer sb) {
374 for(int i=0; i<arguments.length; i++) {
375 if (i>0) sb.append(", ");
376 sb.append(arguments[i]+"");
381 public String toString() {
382 StringBuffer sb = new StringBuffer();
383 sb.append(method.getDeclaringClass() == JSSA.this.method.getDeclaringClass()
385 : (method.getDeclaringClass() + "." + method.name));
387 return sb.toString();
390 public class InvokeStatic extends Invoke { public InvokeStatic(Type.Class.Method m, Expr[] a) { super(m,a); } }
391 public class InvokeSpecial extends InvokeVirtual {
392 public InvokeSpecial(Type.Class.Method m, Expr[] a, Expr e) { super(m,a,e); }
393 public String toString() {
394 StringBuffer sb = new StringBuffer();
395 sb.append(method.name.equals("<init>") ? "super" : method.name);
397 return sb.toString();
400 public class InvokeInterface extends InvokeVirtual{public InvokeInterface(Type.Class.Method m, Expr[] a, Expr e){super(m,a,e);}}
401 public class InvokeVirtual extends Invoke {
402 public final Expr instance;
403 public InvokeVirtual(Type.Class.Method m, Expr[] a, Expr e) { super(m, a); instance = e; }
404 public String toString() {
405 StringBuffer sb = new StringBuffer();
406 sb.append(method.name);
408 return sb.toString();
412 public class Constant extends Expr {
413 private final Object o;
414 public Constant(int i) { this(new Integer(i)); }
415 public Constant(Object o) { this.o = o; }
416 public String toString() { return o.toString(); }
417 public Type getType() {
418 if (o instanceof Byte) return Type.BYTE;
419 if (o instanceof Short) return Type.SHORT;
420 if (o instanceof Character) return Type.CHAR;
421 if (o instanceof Boolean) return Type.BOOLEAN;
422 if (o instanceof Long) return Type.LONG;
423 if (o instanceof Double) return Type.DOUBLE;
424 if (o instanceof Float) return Type.FLOAT;
425 if (o instanceof ConstantPool.Ent) throw new Error("unimplemented");
426 throw new Error("this should not happen");
431 // Implementation //////////////////////////////////////////////////////////////////////////////
433 private Object addOp(int op, Object arg) {
437 MethodGen.Wide w = (MethodGen.Wide)arg;
444 MethodGen.Pair p = (MethodGen.Pair)arg;
451 case NOP: return null;
453 // Stack manipulations //////////////////////////////////////////////////////////////////////////////
455 case ACONST_NULL: return stack[sp++] = new Constant(null);
456 case ICONST_M1: return stack[sp++] = new Constant(-1);
457 case ICONST_0: case LCONST_0: case FCONST_0: case DCONST_0: push(new Constant(0)); return null;
458 case ICONST_1: case LCONST_1: case FCONST_1: case DCONST_1: push(new Constant(1)); return null;
459 case ICONST_2: case FCONST_2: push(new Constant(2)); return null;
460 case ICONST_3: push(new Constant(3)); return null;
461 case ICONST_4: push(new Constant(4)); return null;
462 case ICONST_5: push(new Constant(5)); return null;
463 case ILOAD: case LLOAD: case FLOAD: case DLOAD: case ALOAD: return push(local[i1]);
464 case ILOAD_0: case LLOAD_0: case FLOAD_0: case DLOAD_0: case ALOAD_0: return push(local[0]);
465 case ILOAD_1: case LLOAD_1: case FLOAD_1: case DLOAD_1: case ALOAD_1: return push(local[1]);
466 case ALOAD_2: case DLOAD_2: case FLOAD_2: case LLOAD_2: case ILOAD_2: return push(local[2]);
467 case ILOAD_3: case LLOAD_3: case FLOAD_3: case DLOAD_3: case ALOAD_3: return push(local[3]);
468 case ISTORE: case LSTORE: case FSTORE: case DSTORE: case ASTORE: local[i1] = pop(); return null;
469 case ISTORE_0: case LSTORE_0: case FSTORE_0: case DSTORE_0: case ASTORE_0: local[0] = pop(); return null;
470 case ISTORE_1: case LSTORE_1: case FSTORE_1: case DSTORE_1: case ASTORE_1: local[1] = pop(); return null;
471 case ASTORE_2: case DSTORE_2: case FSTORE_2: case LSTORE_2: case ISTORE_2: local[2] = pop(); return null;
472 case ISTORE_3: case LSTORE_3: case FSTORE_3: case DSTORE_3: case ASTORE_3: local[3] = pop(); return null;
473 case POP: stack[--sp] = null;
474 case POP2: stack[--sp] = null; stack[--sp] = null; /** fixme: pops a WORD, not an item */
475 case DUP: stack[sp] = stack[sp-1]; sp++;
476 case DUP2: stack[sp] = stack[sp-2]; stack[sp+1] = stack[sp-1]; sp+=2;
478 // Conversions //////////////////////////////////////////////////////////////////////////////
480 // coercions are added as-needed when converting from JSSA back to bytecode, so we can
481 // simply discard them here (assuming the bytecode we're reading in was valid in the first place)
483 case I2L: case F2L: case D2L: push(new Cast(pop(), Type.LONG)); return null;
484 case I2F: case L2F: case D2F: push(new Cast(pop(), Type.FLOAT)); return null;
485 case I2D: case L2D: case F2D: push(new Cast(pop(), Type.DOUBLE)); return null;
486 case L2I: case F2I: case D2I: push(new Cast(pop(), Type.INT)); return null;
487 case I2B: push(new Cast(pop(), Type.BYTE)); return null;
488 case I2C: push(new Cast(pop(), Type.CHAR)); return null;
489 case I2S: push(new Cast(pop(), Type.SHORT)); return null;
490 case SWAP: { Expr e1 = pop(), e2 = pop(); push(e2); push(e1); return null; }
492 // Math //////////////////////////////////////////////////////////////////////////////
494 case IADD: case LADD: case FADD: case DADD: push(new Add(pop(), pop())); return null;
495 case ISUB: case LSUB: case FSUB: case DSUB: push(new Sub(pop(), pop())); return null;
496 case IMUL: case LMUL: case FMUL: case DMUL: push(new Mul(pop(), pop())); return null;
497 case IREM: case LREM: case FREM: case DREM: push(new Rem(pop(), pop())); return null;
498 //case INEG: case LNEG: case FNEG: case DNEG: push(new Neg(pop())); return null;
499 case IDIV: case LDIV: case FDIV: case DDIV: push(new Div(pop(), pop())); return null;
500 case ISHL: case LSHL: push(new Shl(pop(), pop())); return null;
501 case ISHR: case LSHR: push(new Shr(pop(), pop())); return null;
502 case IUSHR: case LUSHR: push(new Ushr(pop(), pop())); return null;
503 case IAND: case LAND: push(new And(pop(), pop())); return null;
504 case IOR: case LOR: push(new Or(pop(), pop())); return null;
505 case IXOR: case LXOR: push(new Xor(pop(), pop())); return null;
506 case IINC: return local[i1] = new Add(local[i1], new Constant(i2));
508 // Control and branching //////////////////////////////////////////////////////////////////////////////
510 case IFNULL: return new Branch(new Eq(pop(), new Constant(null)), new Label(i1));
511 case IFNONNULL: return new Branch(new Not(new Eq(pop(),new Constant(null))),new Label(i1));
512 case IFEQ: return new Branch( new Eq(new Constant(0), pop()), arg);
513 case IFNE: return new Branch(new Not(new Eq(new Constant(0), pop())), arg);
514 case IFLT: return new Branch( new Lt(new Constant(0), pop()), arg);
515 case IFGE: return new Branch(new Not(new Lt(new Constant(0), pop())), arg);
516 case IFGT: return new Branch( new Gt(new Constant(0), pop()), arg);
517 case IFLE: return new Branch(new Not(new Gt(new Constant(0), pop())), arg);
518 case IF_ICMPEQ: return new Branch( new Eq(pop(), pop()), arg);
519 case IF_ICMPNE: return new Branch(new Not(new Eq(pop(), pop())), arg);
520 case IF_ICMPLT: return new Branch( new Lt(pop(), pop()), arg);
521 case IF_ICMPGE: return new Branch(new Not(new Lt(pop(), pop())), arg);
522 case IF_ICMPGT: return new Branch( new Gt(pop(), pop()), arg);
523 case IF_ICMPLE: return new Branch(new Not(new Gt(pop(), pop())), arg);
524 case IF_ACMPEQ: return new Branch( new Eq(pop(), pop()), arg);
525 case IF_ACMPNE: return new Branch(new Not(new Eq(pop(), pop())), arg);
526 case ATHROW: return new Throw(pop());
527 case GOTO: return new Branch(new Label(i1));
528 case JSR: return new JSR(new Label(i1));
529 case RET: return new RET();
530 case RETURN: return new Return();
531 case IRETURN: case LRETURN: case FRETURN: case DRETURN: case ARETURN:
532 return new Return(pop());
534 // Array manipulations //////////////////////////////////////////////////////////////////////////////
536 case IALOAD: case LALOAD: case FALOAD: case DALOAD: case AALOAD:
537 case BALOAD: case CALOAD: case SALOAD: push(new ArrayGet(pop(), pop())); return null;
538 case IASTORE: case LASTORE: case FASTORE: case DASTORE: case AASTORE:
539 case BASTORE: case CASTORE: case SASTORE: return new ArrayPut(pop(), pop(), pop());
541 // Invocation //////////////////////////////////////////////////////////////////////////////
543 case INVOKEVIRTUAL: case INVOKESPECIAL: case INVOKESTATIC: case INVOKEINTERFACE: {
544 Type.Class.Method method = (Type.Class.Method)arg;
545 Expr args[] = new Expr[method.getNumArgs()];
546 for(int i=0; i<args.length; i++) args[args.length-i-1] = pop();
548 case INVOKEVIRTUAL: return push(new InvokeVirtual(method, args, pop()));
549 case INVOKEINTERFACE: return push(new InvokeInterface(method, args, pop()));
550 case INVOKESPECIAL: return push(new InvokeSpecial(method, args, pop()));
551 case INVOKESTATIC: return push(new InvokeStatic(method, args));
555 // Field Access //////////////////////////////////////////////////////////////////////////////
557 case GETSTATIC: push(new Get((Type.Class.Field)arg, null)); return null;
558 case PUTSTATIC: return new Put((Type.Class.Field)arg, pop(), null);
559 case GETFIELD: push(new Get((Type.Class.Field)arg, pop())); return null;
560 case PUTFIELD: return new Put((Type.Class.Field)arg, pop(), pop());
562 // Allocation //////////////////////////////////////////////////////////////////////////////
564 case NEW: push(new New((Type.Class)arg)); return null;
567 switch(((Integer)arg).intValue()) {
568 case 4: base = Type.BOOLEAN; break;
569 case 5: base = Type.CHAR; break;
570 case 6: base = Type.FLOAT; break;
571 case 7: base = Type.DOUBLE; break;
572 case 8: base = Type.BYTE; break;
573 case 9: base = Type.SHORT; break;
574 case 10: base = Type.INT; break;
575 case 11: base = Type.LONG; break;
576 default: throw new IllegalStateException("invalid array type");
578 push(new NewArray(base.makeArray(),pop()));
581 case ANEWARRAY: push(new NewArray(((Type.Ref)arg).makeArray(), pop())); return null;
582 case MULTIANEWARRAY: {
583 MethodGen.MultiANewArray mana = (MethodGen.MultiANewArray) arg;
584 Expr[] dims = new Expr[mana.dims];
585 for(int i=0;i<dims.length;i++) dims[i] = pop();
586 push(new NewArray(mana.type, dims));
589 case ARRAYLENGTH: push(new ArrayLength(pop())); return null;
591 // Runtime Type information //////////////////////////////////////////////////////////////////////////////
593 case CHECKCAST: push(new Cast(pop(), (Type.Ref)arg)); return null;
594 case INSTANCEOF: push(new InstanceOf(pop(), (Type.Ref)arg)); return null;
596 case LDC: case LDC_W: case LDC2_W: push(new Constant(arg)); return null;
598 case BIPUSH: push(new Constant(i1)); // FIXME return null;
599 case SIPUSH: push(new Constant(i1)); // FIXME return null;
601 case TABLESWITCH: new Branch((MethodGen.Switch)arg);
602 case LOOKUPSWITCH: new Branch((MethodGen.Switch)arg);
605 case MONITORENTER: Op.monitorEnter(pop());
606 case MONITOREXIT: Op.monitorExit(pop());
609 case DUP_X1: throw new Error("unimplemented");
610 case DUP_X2: throw new Error("unimplemented");
611 case DUP2_X1: throw new Error("unimplemented");
612 case DUP2_X2: throw new Error("unimplemented");
613 case LCMP: throw new Error("unimplemented");
614 case FCMPL: throw new Error("unimplemented");
615 case FCMPG: throw new Error("unimplemented");
616 case DCMPL: throw new Error("unimplemented");
617 case DCMPG: throw new Error("unimplemented");
618 case GOTO_W: throw new Error("unimplemented");
619 case JSR_W: throw new Error("unimplemented");
620 default: throw new Error("unhandled");
624 public static void main(String[] args) throws Exception {
625 InputStream is = Class.forName(args[0]).getClassLoader().getResourceAsStream(args[0].replace('.', '/')+".class");
626 System.out.println(new ClassFile(new DataInputStream(is), true).toString());