First new Flow version

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@24 379699f6-c40d-0410-875b-85095c16579e

jode/jode/bytecode/Opcodes.java

@@ -18,12 +18,13 @@
  */
 
 package jode;
+import jode.flow.*;
 import java.io.*;
 import sun.tools.java.*;
 
 /**
- * This is an abstract class which creates InstructionHeader for the
+ * This is an abstract class which creates flow blocks for the
- * opcodes in an byte stream.
+ * opcodes in a byte stream.
  */
 public abstract class Opcodes implements RuntimeConstants {
 
@@ -47,19 +48,54 @@ public abstract class Opcodes implements RuntimeConstants{
     };
 
 
+    public static FlowBlock createNormal(int addr, int length, 
+                                         Instruction instr)
+    {
+        return new FlowBlock(addr, length,
+                             new InstructionBlock(instr, 
+                                                  new Jump(addr+length)));
+    }
+
+    public static FlowBlock createGoto(int addr, int length, 
+                                       int destAddr)
+    {
+        return new FlowBlock(addr, length, new EmptyBlock(new Jump(destAddr)));
+    }
+
+    public static FlowBlock createIfGoto(int addr, int length, 
+                                         int destAddr, Instruction instr)
+    {
+        ConditionalBlock ifBlock = 
+            new ConditionalBlock(instr, 
+                                 new Jump(destAddr),
+                                 new Jump(addr+length));
+        return new FlowBlock(addr, length, ifBlock);
+    }
+
+    public static FlowBlock createSwitch(int addr, int length, 
+                                         int[] cases, int[] dests)
+    {
+        return new FlowBlock(addr, length, new SwitchBlock(cases, dests));
+    }
+
+    public static FlowBlock createBlock(int addr, int length, 
+                                        StructuredBlock block)
+    {
+        return new FlowBlock(addr, length, block);
+    }
+
     /**
      * Read an opcode out of a data input stream containing the bytecode.
      * @param addr    The current address.
      * @param stream  The stream containing the java byte code.
      * @param ca      The Code Analyzer 
      *                (where further information can be get from).
-     * @return The InstructionHeader representing this opcode
+     * @return The FlowBlock representing this opcode
      *         or null if the stream is empty.
      * @exception IOException  if an read error occured.
      * @exception ClassFormatError  if an invalid opcode is detected.
      */
-    public static 
+    public static FlowBlock readOpcode(int addr, DataInputStream stream,
-	InstructionHeader readOpcode(int addr, DataInputStream stream,
                                        CodeAnalyzer ca) 
         throws IOException, ClassFormatError
     {
@@ -67,42 +103,42 @@ public abstract class Opcodes implements RuntimeConstants{
             int opcode = stream.readUnsignedByte();
             switch (opcode) {
             case opc_nop:
-                return InstructionHeader.createNormal(addr, 1, new NopOperator());
+                return createNormal(addr, 1, new NopOperator());
             case opc_aconst_null:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new ConstOperator(OBJECT_TYPE, "null"));
 	    case opc_iconst_m1: 
             case opc_iconst_0: case opc_iconst_1: case opc_iconst_2:
             case opc_iconst_3: case opc_iconst_4: case opc_iconst_5:
-                return InstructionHeader.createNormal
+                return createNormal
                     (addr, 1, new ConstOperator
 		     (ALL_INT_TYPE, Integer.toString(opcode - opc_iconst_0)));
             case opc_lconst_0: case opc_lconst_1:
-		return InstructionHeader.createNormal
+		return createNormal
 		    (addr, 1, new ConstOperator
 		     (LONG_TYPE, 
 		      Integer.toString(opcode - opc_lconst_0) + "L"));
 	    case opc_fconst_0: case opc_fconst_1: case opc_fconst_2:
-		return InstructionHeader.createNormal
+		return createNormal
 		    (addr, 1, new ConstOperator
 		     (FLOAT_TYPE, 
 		      Integer.toString(opcode - opc_fconst_0) + ".0F"));
             case opc_dconst_0: case opc_dconst_1:
-		return InstructionHeader.createNormal
+		return createNormal
 		    (addr, 1, new ConstOperator
 		     (DOUBLE_TYPE, 
 		      Integer.toString(opcode - opc_dconst_0) + ".0"));
             case opc_bipush:
-		return InstructionHeader.createNormal
+		return createNormal
 		    (addr, 2, new ConstOperator
 		     (ALL_INT_TYPE, Integer.toString(stream.readByte())));
             case opc_sipush:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 3, new ConstOperator
 		     (ALL_INT_TYPE, Integer.toString(stream.readShort())));
             case opc_ldc: {
                 int index = stream.readUnsignedByte();
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 2, new ConstOperator
 		     (ca.env.getConstantType(index),
 		      ca.env.getConstant(index).toString()));
@@ -110,38 +146,38 @@ public abstract class Opcodes implements RuntimeConstants{
             case opc_ldc_w:
             case opc_ldc2_w: {
                 int index = stream.readUnsignedShort();
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 3, new ConstOperator
 		     (ca.env.getConstantType(index),
 		      ca.env.getConstant(index).toString()));
 	    }
             case opc_iload: case opc_lload: 
             case opc_fload: case opc_dload: case opc_aload:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 2, new LocalLoadOperator
 		     (types[0][opcode-opc_iload],
-		      stream.readUnsignedByte()));
+		      new LocalInfo(stream.readUnsignedByte())));
             case opc_iload_0: case opc_iload_1: case opc_iload_2: case opc_iload_3:
             case opc_lload_0: case opc_lload_1: case opc_lload_2: case opc_lload_3:
             case opc_fload_0: case opc_fload_1: case opc_fload_2: case opc_fload_3:
             case opc_dload_0: case opc_dload_1: case opc_dload_2: case opc_dload_3:
             case opc_aload_0: case opc_aload_1: case opc_aload_2: case opc_aload_3:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 1, new LocalLoadOperator
 		     (types[0][(opcode-opc_iload_0)/4],
-		      (opcode-opc_iload_0) & 3));
+		      new LocalInfo((opcode-opc_iload_0) & 3)));
             case opc_iaload: case opc_laload: 
             case opc_faload: case opc_daload: case opc_aaload:
             case opc_baload: case opc_caload: case opc_saload:
-		return InstructionHeader.createNormal
+		return createNormal
 		    (addr, 1, new ArrayLoadOperator
 		     (types[1][opcode - opc_iaload]));
             case opc_istore: case opc_lstore: 
             case opc_fstore: case opc_dstore: case opc_astore:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 2, new LocalStoreOperator
 		     (types[0][opcode-opc_istore],
-		      stream.readUnsignedByte(),
+		      new LocalInfo(stream.readUnsignedByte()),
 		      Operator.ASSIGN_OP));
             case opc_istore_0: case opc_istore_1: 
             case opc_istore_2: case opc_istore_3:
@@ -153,51 +189,51 @@ public abstract class Opcodes implements RuntimeConstants{
             case opc_dstore_2: case opc_dstore_3:
             case opc_astore_0: case opc_astore_1:
             case opc_astore_2: case opc_astore_3:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 1, new LocalStoreOperator
 		     (types[0][(opcode-opc_istore_0)/4],
-		      (opcode-opc_istore_0) & 3,
+		      new LocalInfo((opcode-opc_istore_0) & 3),
 		      Operator.ASSIGN_OP));
             case opc_iastore: case opc_lastore:
             case opc_fastore: case opc_dastore: case opc_aastore:
             case opc_bastore: case opc_castore: case opc_sastore:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 1, new ArrayStoreOperator
 		     (types[1][opcode - opc_iastore]));
             case opc_pop: case opc_pop2:
-		return InstructionHeader.createNormal
+		return createNormal
 		    (addr, 1, new PopOperator(opcode - opc_pop + 1));
             case opc_dup: case opc_dup_x1: case opc_dup_x2:
             case opc_dup2: case opc_dup2_x1: case opc_dup2_x2:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 1, new DupOperator
 		     ((opcode - opc_dup)%3, (opcode - opc_dup)/3+1));
             case opc_swap:
-                return InstructionHeader.createNormal(addr, 1, new SwapOperator());
+                return createNormal(addr, 1, new SwapOperator());
             case opc_iadd: case opc_ladd: case opc_fadd: case opc_dadd:
             case opc_isub: case opc_lsub: case opc_fsub: case opc_dsub:
             case opc_imul: case opc_lmul: case opc_fmul: case opc_dmul:
             case opc_idiv: case opc_ldiv: case opc_fdiv: case opc_ddiv:
             case opc_irem: case opc_lrem: case opc_frem: case opc_drem:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 1, new BinaryOperator
 		     (types[0][(opcode - opc_iadd)%4],
 		      (opcode - opc_iadd)/4+Operator.ADD_OP));
             case opc_ineg: case opc_lneg: case opc_fneg: case opc_dneg:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 1, new UnaryOperator
 		     (types[0][opcode - opc_ineg], Operator.NEG_OP));
             case opc_ishl: case opc_lshl:
             case opc_ishr: case opc_lshr:
             case opc_iushr: case opc_lushr:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new ShiftOperator
 		     (types[0][(opcode - opc_ishl)%2],
 		      (opcode - opc_ishl)/2 + Operator.SHIFT_OP));
             case opc_iand: case opc_land:
             case opc_ior : case opc_lor :
             case opc_ixor: case opc_lxor:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new BinaryOperator
 		     (types[0][(opcode - opc_iand)%2],
 		      (opcode - opc_iand)/2 + Operator.AND_OP));
@@ -209,9 +245,10 @@ public abstract class Opcodes implements RuntimeConstants{
                     value = -value;
                     operation = Operator.NEG_OP;
                 }
-                return InstructionHeader.createNormal
+                LocalInfo li = new LocalInfo(local);
+                return createNormal
 		    (addr, 3, new IIncOperator
-		     (local, Integer.toString(value),
+		     (li, Integer.toString(value),
 		      operation + Operator.OPASSIGN_OP));
             }
             case opc_i2l: case opc_i2f: case opc_i2d:
@@ -222,48 +259,48 @@ public abstract class Opcodes implements RuntimeConstants{
                 int to   = (opcode-opc_i2l)%3;
                 if (to >= from)
                     to++;
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new ConvertOperator(types[0][from], 
 						  types[0][to]));
             }
             case opc_i2b: case opc_i2c: case opc_i2s:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new ConvertOperator
 		     (ALL_INT_TYPE, types[1][(opcode-opc_i2b)+5]));
 	    case opc_lcmp:
             case opc_fcmpl: case opc_fcmpg:
             case opc_dcmpl: case opc_dcmpg:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new CompareToIntOperator
 		     (types[0][(opcode-opc_lcmp+3)/2], (opcode-opc_lcmp+3)%2));
             case opc_ifeq: case opc_ifne: 
             case opc_iflt: case opc_ifge: case opc_ifgt: case opc_ifle:
-                return InstructionHeader.createIfGoto
+                return createIfGoto
 		    (addr, 3, addr+stream.readShort(),
 		     new CompareUnaryOperator
 		     (ALL_INT_TYPE, opcode - opc_ifeq+Operator.COMPARE_OP));
             case opc_if_icmpeq: case opc_if_icmpne: case opc_if_icmplt: 
             case opc_if_icmpge: case opc_if_icmpgt: case opc_if_icmple:
-                return InstructionHeader.createIfGoto
+                return createIfGoto
 		    (addr, 3, addr+stream.readShort(),
 		     new CompareBinaryOperator
 		     (ALL_INT_TYPE, opcode - opc_if_icmpeq+Operator.COMPARE_OP));
             case opc_if_acmpeq: case opc_if_acmpne:
-                return InstructionHeader.createIfGoto
+                return createIfGoto
 		    (addr, 3, addr+stream.readShort(),
 		     new CompareBinaryOperator
 		     (OBJECT_TYPE, opcode - opc_if_acmpeq+Operator.COMPARE_OP));
             case opc_goto:
-                return InstructionHeader.createGoto
+                return createGoto
-		    (addr, 3, addr+stream.readShort());
-            case opc_jsr:
-                return InstructionHeader.createGoto //XXX
 		    (addr, 3, addr+stream.readShort());
-            case opc_ret:
+//             case opc_jsr:
-                return InstructionHeader.createReturn //XXX
+//                 return createGoto //XXX
-		    (addr, 2, 
+// 		    (addr, 3, addr+stream.readShort());
-                     new LocalLoadOperator
+//             case opc_ret:
-		     (OBJECT_TYPE, stream.readUnsignedByte()));
+//                 return createReturn //XXX
+// 		    (addr, 2, 
+//                      new LocalLoadOperator
+// 		     (OBJECT_TYPE, new LocalInfo(stream.readUnsignedByte())));
             case opc_tableswitch: {
                 int length = 3-(addr % 4);
                 stream.skip(length);
@@ -278,8 +315,8 @@ public abstract class Opcodes implements RuntimeConstants{
                 }
                 dests[cases.length] = def;
                 length += 13 + 4 * cases.length;
-                return InstructionHeader.createSwitch
+                return createSwitch
-		    (addr, length, new NopOperator(), cases, dests);
+		    (addr, length, cases, dests);
             }
             case opc_lookupswitch: {
                 int length = 3-(addr % 4);
@@ -294,31 +331,31 @@ public abstract class Opcodes implements RuntimeConstants{
                 }
                 dests[npairs] = def;
                 length += 9 + 8 * npairs;
-                return InstructionHeader.createSwitch
+                return createSwitch
-		    (addr, length, new NopOperator(), cases, dests);
+		    (addr, length, cases, dests);
             }
             case opc_ireturn: case opc_lreturn: 
             case opc_freturn: case opc_dreturn: case opc_areturn: {
                 Type retType = MyType.intersection
                     (ca.getMethod().mdef.getType().getReturnType(),
                      types[0][opcode-opc_ireturn]);
-		return InstructionHeader.createReturn
+		return createBlock
-		    (addr, 1, new ReturnOperator(retType));
+		    (addr, 1, new ReturnBlock(new NopOperator(retType)));
-            }
-	    case opc_return: {
-		return InstructionHeader.createReturn
-		    (addr, 1, null);
             }
+	    case opc_return:
+                /* Address -1 is interpreted as end of method */
+		return createBlock
+		    (addr, 1, new EmptyBlock(new Jump(-1)));
             case opc_getstatic:
             case opc_getfield:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 3, new GetFieldOperator
 		     (ca, opcode == opc_getstatic,
 		      (FieldDefinition)ca.env.getConstant
 		      (stream.readUnsignedShort())));
             case opc_putstatic:
             case opc_putfield:
-		return InstructionHeader.createNormal
+		return createNormal
                     (addr, 3, new PutFieldOperator
 		     (ca, opcode == opc_putstatic,
 		      (FieldDefinition)ca.env.getConstant
@@ -326,26 +363,26 @@ public abstract class Opcodes implements RuntimeConstants{
             case opc_invokevirtual:
             case opc_invokespecial:
             case opc_invokestatic :
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 3, new InvokeOperator
 		     (ca, 
                       opcode == opc_invokestatic, opcode == opc_invokespecial, 
 		      (FieldDefinition)ca.env.getConstant
 		      (stream.readUnsignedShort())));
             case opc_invokeinterface: {
-                InstructionHeader ih =  InstructionHeader.createNormal
+                FlowBlock fb = createNormal
 		    (addr, 5, new InvokeOperator
 		     (ca, false, false,
 		      (FieldDefinition)ca.env.getConstant
 		      (stream.readUnsignedShort())));
                 int reserved = stream.readUnsignedShort();
-		return ih;
+		return fb;
             }
             case opc_new: {
                 ClassDeclaration cldec = (ClassDeclaration) 
                     ca.env.getConstant(stream.readUnsignedShort());
                 Type type = MyType.tClassOrArray(cldec.getName());
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 3, new NewOperator(type, ca.env.getTypeString(type)));
             }
             case opc_newarray: {
@@ -362,7 +399,7 @@ public abstract class Opcodes implements RuntimeConstants{
                 default:
                     throw new ClassFormatError("Invalid newarray operand");
                 }
-                return InstructionHeader.createNormal
+                return createNormal
                     (addr, 2,
                      new NewArrayOperator(MyType.tArray(type),
                                           type.toString(), 1));
@@ -372,21 +409,22 @@ public abstract class Opcodes implements RuntimeConstants{
                     (stream.readUnsignedShort());
                 Identifier ident = cldec.getName();
                 Type type = MyType.tClassOrArray(cldec.getName());
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 3, new NewArrayOperator
                      (MyType.tArray(type), ca.env.getTypeString(type),1));
             }
             case opc_arraylength:
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 1, new ArrayLengthOperator());
             case opc_athrow:
-                return InstructionHeader.createReturn
+                return createBlock
-		    (addr, 1, new ThrowOperator());
+		    (addr, 1, 
+                     new ThrowBlock(new NopOperator(MyType.tUObject)));
             case opc_checkcast: {
                 ClassDeclaration cldec = (ClassDeclaration) ca.env.getConstant
                     (stream.readUnsignedShort());
                 Type type = MyType.tClassOrArray(cldec.getName());
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 3, new CheckCastOperator
 		     (type, ca.env.getTypeString(type)));
             }
@@ -394,30 +432,32 @@ public abstract class Opcodes implements RuntimeConstants{
                 ClassDeclaration cldec = (ClassDeclaration) ca.env.getConstant
                     (stream.readUnsignedShort());
                 Type type = MyType.tClassOrArray(cldec.getName());
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 3,
 		     new InstanceOfOperator(type, ca.env.getTypeString(type)));
             }
             case opc_monitorenter:
-                return InstructionHeader.createNormal(addr, 1,
+                return createNormal(addr, 1,
 					     new MonitorEnterOperator());
             case opc_monitorexit:
-                return InstructionHeader.createNormal(addr, 1,
+                return createNormal(addr, 1,
 					     new MonitorExitOperator());
             case opc_wide: {
                 switch (opcode=stream.readUnsignedByte()) {
                 case opc_iload: case opc_lload: 
                 case opc_fload: case opc_dload: case opc_aload:
-                    return InstructionHeader.createNormal
+                    return createNormal
 			(addr, 4,
 			 new LocalLoadOperator(types[0][opcode-opc_iload],
-					       stream.readUnsignedShort()));
+					       new LocalInfo
+                                               (stream.readUnsignedShort())));
                 case opc_istore: case opc_lstore: 
                 case opc_fstore: case opc_dstore: case opc_astore:
-                    return InstructionHeader.createNormal
+                    return createNormal
 		    (addr, 4,
-		     new LocalStoreOperator(types[0][opcode-opc_istore],
+		     new LocalStoreOperator
-					    stream.readUnsignedShort(),
+                     (types[0][opcode-opc_istore],
+                      new LocalInfo(stream.readUnsignedShort()),
                       Operator.ASSIGN_OP));
                 case opc_iinc: {
 		    int local = stream.readUnsignedShort();
@@ -427,16 +467,18 @@ public abstract class Opcodes implements RuntimeConstants{
 			value = -value;
 			operation = Operator.NEG_OP;
 		    }
-		    return InstructionHeader.createNormal
+                    LocalInfo li = new LocalInfo(local);
+		    return createNormal
 			(addr, 6, new IIncOperator
-			  (local, Integer.toString(value),
+			  (li, Integer.toString(value),
 			   operation + Operator.OPASSIGN_OP));
 		}
-                case opc_ret:
+//                 case opc_ret:
-		    return new RetInstructionHeader
+// 		    return new RetInstructionHeader
-			(addr, 4, 
+// 			(addr, 4, 
-			 new LocalLoadOperator
+// 			 new LocalLoadOperator
-			 (INT_TYPE, stream.readUnsignedShort()));
+// 			 (INT_TYPE, 
+//                        new LocalInfo(stream.readUnsignedShort())));
                 default:
                     throw new ClassFormatError("Invalid wide opcode "+opcode);
                 }
@@ -449,22 +491,22 @@ public abstract class Opcodes implements RuntimeConstants{
                 Type baseType = type;
                 for (int i=0; i<dimension; i++)
                     baseType = baseType.getElementType();
-                return InstructionHeader.createNormal
+                return createNormal
 		    (addr, 4,
 		     new NewArrayOperator
                      (type, ca.env.getTypeString(baseType), dimension));
             }
             case opc_ifnull: case opc_ifnonnull:
-                return InstructionHeader.createIfGoto
+                return createIfGoto
 		    (addr, 3, addr+stream.readShort(),
 		     new CompareUnaryOperator
 		     (OBJECT_TYPE, opcode - opc_ifnull+Operator.COMPARE_OP));
             case opc_goto_w:
-                return InstructionHeader.createGoto
+                return createGoto
 		    (addr, 5, addr + stream.readInt());
-            case opc_jsr_w:
+//             case opc_jsr_w:
-                return InstructionHeader.createGoto
+//                 return createGoto
-		    (addr, 5, addr+stream.readInt()); // XXX
+// 		    (addr, 5, addr+stream.readInt()); // XXX
             default:
                 throw new ClassFormatError("Invalid opcode "+opcode);
             }

jode/jode/decompiler/CodeAnalyzer.java

@@ -19,16 +19,20 @@
 
 package jode;
 import sun.tools.java.*;
+import java.util.Stack;
 import java.io.*;
+import jode.flow.FlowBlock;
 
 public class CodeAnalyzer implements Analyzer, Constants {
     
     BinaryCode bincode;
 
-    MethodInstructionHeader methodHeader;
+    FlowBlock methodHeader;
     MethodAnalyzer method;
     public JodeEnvironment env;
 
+    LocalVariableTable lvt;
+    
     /**
      * Get the method.
      * @return The method to which this code belongs.
@@ -39,20 +43,34 @@ public class CodeAnalyzer implements Analyzer, Constants {
          throws ClassFormatError
     {
         byte[] code = bincode.getCode();
-        InstructionHeader[] instr = new InstructionHeader[code.length];
+        FlowBlock[] instr = new FlowBlock[code.length];
 	int returnCount;
         try {
             DataInputStream stream = 
                 new DataInputStream(new ByteArrayInputStream(code));
 	    for (int addr = 0; addr < code.length; ) {
 		instr[addr] = Opcodes.readOpcode(addr, stream, this);
+
 		addr = instr[addr].getNextAddr();
 	    }
         } catch (IOException ex) {
             throw new ClassFormatError(ex.toString());
         }
         BinaryExceptionHandler[] handlers = bincode.getExceptionHandlers();
-	methodHeader = new MethodInstructionHeader(env, instr, handlers);
+        for (int addr=0; addr<instr.length; ) {
+            instr[addr].resolveJumps(instr);
+            //XXX
+// 	    if (instr[addr].getBlock() instanceof ReturnBlock) {
+//                 ReturnBlock block = (ReturnBlock) instr[addr].getBlock();
+//                 if (block.getInstruction() == null) {
+//                     EmptyBlock empty = new EmptyBlock(dummyReturn);
+//                     empty.replace(block);
+//                 }
+//             }
+            addr = instr[addr].getNextAddr();
+        }
+	methodHeader = instr[0];
+        /* XXX do something with handlers */
     }
 
 	/*
@@ -77,16 +95,16 @@ public class CodeAnalyzer implements Analyzer, Constants {
         readCode();
     }
 
-    static Transformation[] exprTrafos = {
+    static jode.flow.Transformation[] exprTrafos = {
-        new RemoveNop(),
+        new jode.flow.RemoveEmpty(),
-        new CombineCatchLocal(),
+//         new CombineCatchLocal(),
-        new CreateExpression(),
+        new jode.flow.CreateExpression(),
-        new CreatePostIncExpression(),
+//         new CreatePostIncExpression(),
-        new CreateAssignExpression(),
+//         new CreateAssignExpression(),
-        new CreateNewConstructor(),
+//         new CreateNewConstructor(),
-        new CombineIfGotoExpressions(),
+//         new CombineIfGotoExpressions(),
-        new CreateIfThenElseOperator(),
+//         new CreateIfThenElseOperator(),
-        new CreateConstantArray()
+//         new CreateConstantArray()
     };
 
     static Transformation[] simplifyTrafos = { new SimplifyExpression() };
@@ -101,9 +119,57 @@ public class CodeAnalyzer implements Analyzer, Constants {
 
     public void analyze()
     {
-        methodHeader.doTransformations(exprTrafos);
+        /* XXX optimize */
-        methodHeader.doTransformations(simplifyTrafos);
+        Stack todo = new Stack();
-        methodHeader.doTransformations(blockTrafos);
+        FlowBlock flow = methodHeader;
+        while (true) {
+
+            /* First do some non flow transformations. */
+            int i=0;
+            while (i < exprTrafos.length) {
+                if (exprTrafos[i].transform(flow))
+                    i = 0;
+                else
+                    i++;
+            }
+            
+            if (flow.doT2()) {
+                /* T2 transformation succeeded.  This may
+                 * make another T1 analysis in the previous
+                 * block possible.  
+                 */
+                if (!todo.isEmpty())
+                    flow = (FlowBlock) todo.pop();
+            }
+
+            FlowBlock succ = flow.getSuccessor();
+            if (succ != null) {
+
+                if (!flow.doT1(succ)) {
+
+                    /* T1 transformation failed, now succeed with
+                     * successor and put flow on the stack.  
+                     */
+                    if (todo.contains(succ)) {
+                        /* This is a sign that the flow graph is not
+                         * reducible.  We give up immediately!
+                         */
+                        break;
+                    }
+                    todo.push(flow);
+                    flow = succ;
+                }
+            } else {
+                /* Block has no successor.
+                 *
+                 * If everything is okay the stack should be empty now,
+                 * and the program is transformed correctly.
+                 *
+                 * Otherwise flow transformation didn't succeeded.
+                 */
+                break;
+            }
+        }
     }
 
     public String getTypeString(Type type) {

jode/jode/decompiler/LocalInfo.java

@@ -63,9 +63,13 @@ public class LocalInfo {
      * @param li the local info that we want to shadow.
      */
     public void combineWith(LocalInfo li) {
-        if (shadow != null)
-            shadow.combineWith(li);
         li = li.getLocalInfo();
+        if (shadow != null) {
+            while (shadow.shadow != null) {
+                shadow = shadow.shadow;
+            }
+            shadow.combineWith(li);
+        }
         if (this != li) {
             shadow = li;
             li.setType(type);
@@ -77,8 +81,12 @@ public class LocalInfo {
      * current object if this is a shadow local info.
      */
     public LocalInfo getLocalInfo() {
-        if (shadow != null)
+        if (shadow != null) {
+            while (shadow.shadow != null) {
+                shadow = shadow.shadow;
+            }
             return shadow.getLocalInfo();
+        }
         return this;
     }
 
@@ -86,8 +94,12 @@ public class LocalInfo {
      * Get the name of this local.
      */
     public Identifier getName() {
-        if (shadow != null) 
+        if (shadow != null) {
+            while (shadow.shadow != null) {
+                shadow = shadow.shadow;
+            }
             return shadow.getName();
+        }
         if (name == null)
             name = Identifier.lookup("local_"+slot+"__"+serialnr++);
         return name;
@@ -96,7 +108,7 @@ public class LocalInfo {
     /**
      * Get the slot of this local.
      */
-    public Identifier getSlot() {
+    public int getSlot() {
         /* The slot does not change when shadowing */
         return slot;
     }
@@ -115,8 +127,12 @@ public class LocalInfo {
      * Get the type of this local.
      */
     public Type getType() {
-        if (shadow != null) 
+        if (shadow != null) {
+            while (shadow.shadow != null) {
+                shadow = shadow.shadow;
+            }
             return shadow.getType();
+        }
         return type;
     }
 
@@ -127,8 +143,12 @@ public class LocalInfo {
      * @return The new type of the local.
      */
     public Type setType(Type newType) {
-        if (shadow != null) 
+        if (shadow != null) {
+            while (shadow.shadow != null) {
+                shadow = shadow.shadow;
+            }
             return shadow.setType(newType);
+        }
         this.type = MyType.intersection(this.type, newType);
         if (this.type == MyType.tError)
             System.err.println("Type error in "+getName());

jode/jode/decompiler/LocalVariableAnalyzer.java

@@ -79,131 +79,131 @@ public class LocalVariableAnalyzer {
         return li2.getLocalInfo();
     }
 
-    public void analyze(MethodInstructionHeader mih) {
+//     public void analyze(MethodInstructionHeader mih) {
-        {
+//         {
-            Type[] paramTypes = mdef.getType().getArgumentTypes();
+//             Type[] paramTypes = mdef.getType().getArgumentTypes();
-            int length = (mdef.isStatic() ? 0 : 1) + paramTypes.length;
+//             int length = (mdef.isStatic() ? 0 : 1) + paramTypes.length;
-            argLocals = new LocalInfo[length];
+//             argLocals = new LocalInfo[length];
-            int offset = 0;
+//             int offset = 0;
-            if (!mdef.isStatic()) {
+//             if (!mdef.isStatic()) {
-                argLocals[0] = new LocalInfo(0);
+//                 argLocals[0] = new LocalInfo(0);
-                argLocals[0].setType(mdef.getClassDefinition().getType());
+//                 argLocals[0].setType(mdef.getClassDefinition().getType());
-                offset++;
+//                 offset++;
-            }
+//             }
-            for (int i=0; i< paramTypes.length; i++) {
+//             for (int i=0; i< paramTypes.length; i++) {
-                argLocals[offset+i] = new LocalInfo(i+offset);
+//                 argLocals[offset+i] = new LocalInfo(i+offset);
-                argLocals[offset+i].setType(paramTypes[i]);
+//                 argLocals[offset+i].setType(paramTypes[i]);
-            }
+//             }
-        }
+//         }
-
-	Hashtable done = new Hashtable();
-	Stack instrStack = new Stack();
-	Stack readsStack = new Stack();
-        LocalInfo[] reads = new LocalInfo[maxlocals];
 
-	Enumeration predec = mih.getReturns().elements();
+// 	Hashtable done = new Hashtable();
-	while (predec.hasMoreElements()) {
+// 	Stack instrStack = new Stack();
-	    instrStack.push(predec.nextElement());
+// 	Stack readsStack = new Stack();
-	    readsStack.push(reads);
+//         LocalInfo[] reads = new LocalInfo[maxlocals];
-	}
 
-	while (!instrStack.empty()) {
+// 	Enumeration predec = mih.getReturns().elements();
-	    InstructionHeader instr = 
+// 	while (predec.hasMoreElements()) {
-		(InstructionHeader) instrStack.pop();
+// 	    instrStack.push(predec.nextElement());
-	    LocalInfo[] prevReads =
+// 	    readsStack.push(reads);
-		(LocalInfo[]) done.get(instr);
+// 	}
-	    reads = (LocalInfo[]) readsStack.pop();
 
-//             System.err.println("");
+// 	while (!instrStack.empty()) {
-//             System.err.print("Addr: "+instr.getAddress()+ " [");
+// 	    InstructionHeader instr = 
+// 		(InstructionHeader) instrStack.pop();
+// 	    LocalInfo[] prevReads =
+// 		(LocalInfo[]) done.get(instr);
+// 	    reads = (LocalInfo[]) readsStack.pop();
+
+// //             System.err.println("");
+// //             System.err.print("Addr: "+instr.getAddress()+ " [");
+// //             for (int i=0; i< maxlocals; i++) {
+// //                 if (reads[i] != null) 
+// //                     System.err.print(", "+reads[i].getName().toString());
+// //             }
+// //             System.err.print("] ");
+
+// 	    if (prevReads != null) {
+//                 boolean changed = false;
 // 		for (int i=0; i<maxlocals; i++) {
-//                 if (reads[i] != null) 
+// 		    if (reads[i] != null) {
-//                     System.err.print(", "+reads[i].getName().toString());
+//                         reads[i] = reads[i].getLocalInfo();
-//             }
+//                         if (prevReads[i] == null) {
-//             System.err.print("] ");
+//                             changed = true;
-
+//                         } else if (prevReads[i].getLocalInfo() != reads[i]) {
-	    if (prevReads != null) {
+//                             prevReads[i].combineWith(reads[i]);
-                boolean changed = false;
+//                             changed = true;
-		for (int i=0; i<maxlocals; i++) {
+//                         }
-		    if (reads[i] != null) {
+// 		    }
-                        reads[i] = reads[i].getLocalInfo();
+//                 }
-                        if (prevReads[i] == null) {
+// 		if (!changed)
-                            changed = true;
+// 		    continue;
-                        } else if (prevReads[i].getLocalInfo() != reads[i]) {
+// 	    }
-                            prevReads[i].combineWith(reads[i]);
-                            changed = true;
-                        }
-		    }
-                }
-		if (!changed)
-		    continue;
-	    }
             
-            if (instr instanceof MethodInstructionHeader) {
+//             if (instr instanceof MethodInstructionHeader) {
-                /* This is the first instruction 
+//                 /* This is the first instruction 
-                 */
+//                  */
-                for (int i=0; i < argLocals.length; i++) {
+//                 for (int i=0; i < argLocals.length; i++) {
-                    if (reads[i] != null)
+//                     if (reads[i] != null)
-                        argLocals[i].combineWith(reads[i]);
+//                         argLocals[i].combineWith(reads[i]);
-                }
+//                 }
-            } else if (instr.getInstruction() instanceof LocalVarOperator) {
+//             } else if (instr.getInstruction() instanceof LocalVarOperator) {
 
-                if (Decompiler.isVerbose)
+//                 if (Decompiler.isVerbose)
-                    System.err.print(".");
+//                     System.err.print(".");
 
-                LocalVarOperator op = 
+//                 LocalVarOperator op = 
-                    (LocalVarOperator)instr.getInstruction();
+//                     (LocalVarOperator)instr.getInstruction();
-                int slot = op.getSlot();
+//                 int slot = op.getSlot();
                 
-                LocalInfo li = combine(slot, op.getLocalInfo(), 
+//                 LocalInfo li = combine(slot, op.getLocalInfo(), 
-                                       reads[slot]);
+//                                        reads[slot]);
                 
-                LocalInfo[] newReads = new LocalInfo[maxlocals];
+//                 LocalInfo[] newReads = new LocalInfo[maxlocals];
-                System.arraycopy(reads, 0, newReads, 0, maxlocals);
+//                 System.arraycopy(reads, 0, newReads, 0, maxlocals);
                 
-                op.setLocalInfo(li);
+//                 op.setLocalInfo(li);
-                if (op.isRead())
+//                 if (op.isRead())
-                    newReads[slot] = li;
+//                     newReads[slot] = li;
-                else
+//                 else
-                    newReads[slot] = null;
+//                     newReads[slot] = null;
                 
-                reads = newReads;
+//                 reads = newReads;
-                done.put(instr, reads);
+//                 done.put(instr, reads);
-            }
+//             }
             
-            predec = instr.getPredecessors().elements();
+//             predec = instr.getPredecessors().elements();
-            while (predec.hasMoreElements()) {
+//             while (predec.hasMoreElements()) {
-                instrStack.push(predec.nextElement());
+//                 instrStack.push(predec.nextElement());
-                readsStack.push(reads);
+//                 readsStack.push(reads);
-            }
+//             }
-	}
+// 	}
-        if (!mdef.isStatic())
+//         if (!mdef.isStatic())
-            argLocals[0].setName(Constants.idThis);
+//             argLocals[0].setName(Constants.idThis);
-    }
+//     }
 
     public void createLocalInfo(CodeAnalyzer code) {
         // System.err.println("createLocalInfo");
-        MethodInstructionHeader mih = code.methodHeader;
+//         MethodInstructionHeader mih = code.methodHeader;
-        if (lvt == null)
+//         if (lvt == null)
-            analyze(mih);
+//             analyze(mih);
-        else {
+//         else {
             int length = (mdef.isStatic() ? 0 : 1) + 
                 mdef.getType().getArgumentTypes().length;
 	    argLocals = new LocalInfo[length];
             for (int i=0; i < length; i++)
                 argLocals[i] = lvt.getLocal(i).getInfo(-1);
-            for (InstructionHeader ih = mih.getFirst(); 
+//             for (InstructionHeader ih = mih.getFirst(); 
-                 ih != null; ih = ih.getNextInstruction()) {
+//                  ih != null; ih = ih.getNextInstruction()) {
-                if (ih.getInstruction() instanceof LocalVarOperator) {
+//                 if (ih.getInstruction() instanceof LocalVarOperator) {
-                    LocalVarOperator op = 
+//                     LocalVarOperator op = 
-                        (LocalVarOperator)ih.getInstruction();
+//                         (LocalVarOperator)ih.getInstruction();
-                    int slot = op.getSlot();
+//                     int slot = op.getSlot();
-                    LocalInfo li = 
+//                     LocalInfo li = 
-                        lvt.getLocal(slot).getInfo(ih.getAddress());
+//                         lvt.getLocal(slot).getInfo(ih.getAddress());
-                    op.setLocalInfo(li);
+//                     op.setLocalInfo(li);
-                } 
+//                 } 
-            }
+//             }
-        }
+//         }
     }
 
     public LocalInfo getLocal(int i) {

jode/jode/expr/IIncOperator.java

@@ -22,13 +22,12 @@ import sun.tools.java.Type;
 
 public class IIncOperator extends NoArgOperator 
 implements LocalVarOperator {
-    int slot;
     String value;
     LocalInfo local;
 
-    public IIncOperator(int slot, String value, int operator) {
+    public IIncOperator(LocalInfo local, String value, int operator) {
         super(MyType.tVoid, operator);
-        this.slot = slot;
+        this.local = local;
 	this.value = value;
     }
 
@@ -44,18 +43,18 @@ implements LocalVarOperator {
         return true;
     }
 
-    public void setLocalInfo(LocalInfo local) {
+//     public void setLocalInfo(LocalInfo local) {
-        local.setType(MyType.tUIndex);
+//         local.setType(MyType.tUIndex);
-	this.local = local;
+// 	this.local = local;
-    }
+//     }
 
     public LocalInfo getLocalInfo() {
 	return local;
     }
 
-    public int getSlot() {
+//     public int getSlot() {
-        return slot;
+//         return slot;
-    }
+//     }
 
     public int getPriority() {
         return 100;

jode/jode/expr/LocalLoadOperator.java

@@ -22,12 +22,11 @@ import sun.tools.java.Type;
 
 public class LocalLoadOperator extends ConstOperator 
 implements LocalVarOperator {
-    int slot;
     LocalInfo local;
 
-    public LocalLoadOperator(Type type, int slot) {
+    public LocalLoadOperator(Type type, LocalInfo local) {
         super(type, "");
-        this.slot = slot;
+        this.local = local;
     }
 
     public boolean isRead() {
@@ -38,10 +37,10 @@ implements LocalVarOperator {
         return false;
     }
 
-    public void setLocalInfo(LocalInfo local) {
+//     public void setLocalInfo(LocalInfo local) {
-        local.setType(type);
+//         local.setType(type);
-	this.local = local;
+// 	this.local = local;
-    }
+//     }
 
     public LocalInfo getLocalInfo() {
 	return local;
@@ -57,9 +56,9 @@ implements LocalVarOperator {
 	return super.setType(local.setType(type));
     }
 
-    public int getSlot() {
+//     public int getSlot() {
-        return slot;
+//         return slot;
-    }
+//     }
 
     public String toString(String[] operands) {
         return local.getName().toString();
@@ -67,7 +66,7 @@ implements LocalVarOperator {
 
     public boolean equals(Object o) {
         return (o instanceof LocalLoadOperator &&
-                ((LocalLoadOperator) o).slot == slot);
+                ((LocalLoadOperator) o).local.getSlot() == local.getSlot());
     }
 }
 

jode/jode/expr/LocalStoreOperator.java

@@ -22,12 +22,11 @@ import sun.tools.java.Type;
 
 public class LocalStoreOperator extends StoreInstruction 
 implements LocalVarOperator {
-    int slot;
     LocalInfo local;
 
-    public LocalStoreOperator(Type lvalueType, int slot, int operator) {
+    public LocalStoreOperator(Type lvalueType, LocalInfo local, int operator) {
         super(lvalueType, operator);
-        this.slot = slot;
+        this.local = local;
     }
 
     public boolean isRead() {
@@ -38,10 +37,10 @@ implements LocalVarOperator {
         return true;
     }
 
-    public void setLocalInfo(LocalInfo local) {
+//     public void setLocalInfo(LocalInfo local) {
-        local.setType(lvalueType);
+//         local.setType(lvalueType);
-	this.local = local;
+// 	this.local = local;
-    }
+//     }
 
     public LocalInfo getLocalInfo() {
 	return local;
@@ -58,9 +57,9 @@ implements LocalVarOperator {
 	    (local.setType(MyType.tSuperType(type)));
     }
 
-    public int getSlot() {
+//     public int getSlot() {
-        return slot;
+//         return slot;
-    }
+//     }
 
     public boolean matches(Operator loadop) {
         return loadop instanceof LocalLoadOperator && 

jode/jode/expr/LocalVarOperator.java

@@ -22,9 +22,9 @@ package jode;
 public interface LocalVarOperator {
     public boolean isRead();
     public boolean isWrite();
-    public int getSlot();
+//     public int getSlot();
     public LocalInfo getLocalInfo();
-    public void setLocalInfo(LocalInfo li);
+//     public void setLocalInfo(LocalInfo li);
 }
          
          

jode/jode/flow/BreakBlock.java

@@ -0,0 +1,71 @@
+/* BreakBlock (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+package jode.flow;
+import jode.TabbedPrintWriter;
+
+/**
+ * 
+ */
+public class BreakBlock extends StructuredBlock {
+    StructuredBlock breaksBlock;
+    String label;
+
+    public BreakBlock(BreakableBlock breaksBlock, boolean needsLabel) {
+        this.breaksBlock = breaksBlock;
+        breaksBlock.mayChangeJump = false;
+        if (needsLabel) 
+            label = breaksBlock.getLabel();
+        else
+            label = null;
+    }
+
+    public void checkConsistent() {
+        super.checkConsistent();
+        StructuredBlock sb = outer;
+        while (sb != breaksBlock) {
+            if (sb == null) 
+                throw new RuntimeException("Inconsistency");
+            sb = sb.outer;
+        }
+    }
+
+    /**
+     * Returns the block where the control will normally flow to, when
+     * this block is finished.
+     */
+    public StructuredBlock getNextBlock() {
+        return breaksBlock.getNextBlock();
+    }
+
+    /**
+     * Returns the flow block where the control will normally flow to,
+     * when this block is finished (not ignoring the jump after this
+     * block).  
+     * @return null, if the control flows into a non empty structured
+     * block or if this is the outermost block.
+     */
+    public FlowBlock getNextFlowBlock() {
+        return breaksBlock.getNextFlowBlock();
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+	throws java.io.IOException
+    {
+        writer.println("break"+(label == null ? "" : " "+label) + ";");
+    }
+}

jode/jode/flow/BreakableBlock.java

@@ -0,0 +1,74 @@
+/* BreakableBlock (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+package jode.flow;
+import jode.TabbedPrintWriter;
+
+/**
+ * This is a structured block, that supports break.  
+ */
+public abstract class BreakableBlock extends StructuredBlock {
+
+    boolean mayChangeJump = true;
+
+    /**
+     * Print the source code for this structured block.  This handles
+     * everything that is unique for all structured blocks and calls
+     * dumpInstruction afterwards.
+     * @param writer The tabbed print writer, where we print to.
+     */
+    public void dumpSource(TabbedPrintWriter writer)
+        throws java.io.IOException
+    {
+        if (label != null) {
+            writer.untab();
+            writer.println(label+":");
+            writer.tab();
+        }
+        super.dumpSource(writer);
+    }
+
+    /**
+     * The serial number for labels.
+     */
+    static int serialno = 0;
+
+    /**
+     * The label of this instruction, or null if it needs no label.
+     */
+    String label = null;
+
+    /**
+     * Returns the label of this block and creates a new label, if
+     * there wasn't a label previously.
+     */
+    public String getLabel() {
+        if (label == null)
+            label = "label_"+(serialno++)+"_";
+        return label;
+    }
+
+    /**
+     * Determines if there is a sub block, that flows through to the end
+     * of this block.  If this returns true, you know that jump is null.
+     * @return true, if the jump may be safely changed.
+     */
+    public boolean jumpMayBeChanged() {
+        return mayChangeJump;
+    }
+
+}

jode/jode/flow/ConditionalBlock.java

@@ -0,0 +1,113 @@
+/* ConditionalBlock (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+package jode.flow;
+import jode.Instruction;
+import jode.LocalVarOperator;
+import jode.TabbedPrintWriter;
+
+/**
+ * An ConditionalBlock is the structured block representing an if
+ * instruction.  The else part may be null.
+ */
+public class ConditionalBlock extends StructuredBlock 
+    implements InstructionContainer {
+
+    /**
+     * The condition.  Must be of boolean type.
+     */
+    Instruction cond;
+
+    StructuredBlock trueBlock;
+    
+    /**
+     * Creates a new if then else block.  The method setThenBlock must
+     * be called shortly after the creation.
+     */
+    public ConditionalBlock(Instruction cond, Jump condJump, Jump elseJump) {
+        this.cond = cond;
+        if (cond instanceof LocalVarOperator) {
+            LocalVarOperator varOp = (LocalVarOperator) cond;
+            if (varOp.isRead()) {
+                in.addElement(varOp.getLocalInfo());
+            }
+            out.addElement(varOp.getLocalInfo());
+        }
+        this.jump = elseJump;
+        elseJump.prev = this;
+        trueBlock = new EmptyBlock(condJump);
+        trueBlock.outer = this;
+    }
+
+    public Instruction getInstruction() {
+        return cond;
+    }
+
+    /**
+     * Change the underlying instruction.
+     * @param instr the new underlying instruction.
+     */
+    public void setInstruction(Instruction instr) {
+        this.cond = instr;
+    }
+
+    public Instruction getCondition(Jump forJump) {
+        /*XXX*/
+        return cond;
+    }
+
+    /* The implementation of getNext[Flow]Block is the standard
+     * implementation 
+     */
+
+    /**
+     * Returns all sub block of this structured block.
+     */
+    public StructuredBlock[] getSubBlocks() {
+        StructuredBlock[] result = { trueBlock };
+        return result;
+    }
+
+    /**
+     * Replaces the given sub block with a new block.
+     * @param oldBlock the old sub block.
+     * @param newBlock the new sub block.
+     * @return false, if oldBlock wasn't a direct sub block.
+     */
+    public boolean replaceSubBlock(StructuredBlock oldBlock, 
+                            StructuredBlock newBlock) {
+        if (trueBlock == oldBlock)
+            trueBlock = newBlock;
+        else
+            return false;
+        return true;
+    }
+
+    /**
+     * Print the source code for this structured block.  This may be
+     * called only once, because it remembers which local variables
+     * were declared.
+     */
+    public void dumpInstruction(TabbedPrintWriter writer)
+        throws java.io.IOException
+    {
+        writer.println("IF ("+cond.toString()+")");
+        writer.tab();
+        trueBlock.dumpSource(writer);
+        writer.untab();
+    }
+}

jode/jode/flow/ContinueBlock.java

@@ -0,0 +1,72 @@
+/* ContinueBlock (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+package jode.flow;
+import jode.TabbedPrintWriter;
+
+/**
+ * 
+ */
+public class ContinueBlock extends StructuredBlock {
+    StructuredBlock continuesBlock;
+    String continueLabel;
+
+    public ContinueBlock(LoopBlock continuesBlock, boolean needsLabel) {
+        this.continuesBlock = continuesBlock;
+        if (needsLabel) 
+            continueLabel = continuesBlock.getLabel();
+        else
+            continueLabel = null;
+    }
+
+    public void checkConsistent() {
+        super.checkConsistent();
+        StructuredBlock sb = outer;
+        while (sb != continuesBlock) {
+            if (sb == null) 
+                throw new RuntimeException("Inconsistency");
+            sb = sb.outer;
+        }
+    }
+
+    /**
+     * Returns the block where the control will normally flow to, when
+     * this block is finished (not ignoring the jump after this block).
+     */
+    public StructuredBlock getNextBlock() {
+        /* This continues to continuesBlock. */
+        return continuesBlock;
+    }
+
+    /**
+     * Returns the flow block where the control will normally flow to,
+     * when this block is finished (not ignoring the jump after this
+     * block).  
+     * @return null, if the control flows into a non empty structured
+     * block or if this is the outermost block.
+     */
+    public FlowBlock getNextFlowBlock() {
+        return null;
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+	throws java.io.IOException
+    {
+        writer.println("continue"+
+                       (continueLabel == null ? "" : " "+continueLabel) + ";");
+    }
+}

jode/jode/flow/CreateExpression.java

@@ -17,39 +17,90 @@
  * $Id$
  */
 
-package jode;
+package jode.flow;
+import jode.Operator;
+import jode.Expression;
 
+/**
+ * This transformation creates expressions.  It transforms
+ * <pre>
+ *  Sequ[expr_1, Sequ[expr_2, ..., Sequ[expr_n, op] ...]] 
+ * </pre>
+ * to
+ * <pre>
+ *  expr(op, [ expr_1, ..., expr_n ])
+ * </pre>
+ */
 public class CreateExpression implements Transformation {
 
-    public StructuredBlock transform(StructuredBlock block) {
+    /**
+     * This does the transformation.
+     * @param FlowBlock the flow block to transform.
+     * @return true if flow block was simplified.
+     */
+    public boolean transform(FlowBlock flow) {
         Operator op;
         Expression exprs[];
         int params;
+        StructuredBlock block;
+
+        try {
+            jode.TabbedPrintWriter writer = 
+                new jode.TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("Transformation on: "+flow.getLabel());
+            flow.block.dumpSource(writer);
+            flow.checkConsistent();
+            System.err.println("; lastModified is: ");
+            flow.lastModified.dumpSource(writer);
+        } catch (java.io.IOException ex) {}
         try {
-            op = (Operator) block.getInstruction();
+            SequentialBlock sequBlock;
+            block = flow.lastModified;
+            op = (Operator) ((InstructionContainer)block).getInstruction();
             params  = op.getOperandCount();
             exprs = new Expression[params];
+            
             for (int i = params-1; i>=0; i--) {
-                block = block.getSimpleUniquePredecessor();
+                sequBlock = (SequentialBlock)block.outer;
-                exprs[i] = (Expression) ih.getInstruction();
+                if (i == params-1 &&
+                    sequBlock.getSubBlocks()[1] != block)
+                    return false;
+
+                block = sequBlock.getSubBlocks()[0];
+                if (block.jump != null)
+                    return false;
+                exprs[i] = 
+                    (Expression) ((InstructionBlock)block).getInstruction();
                 if (exprs[i].isVoid()) {
 		    if (i == params-1)
-			return null;
+			return false;
 		    Expression e = exprs[i+1].tryToCombine(exprs[i]);
 		    if (e == null)
-			return null;
+			return false;
 		    i++;
+                    SequentialBlock subExprBlock = 
+                        (SequentialBlock) sequBlock.getSubBlocks()[1];
+                    subExprBlock.replace(sequBlock);
+                    sequBlock = subExprBlock;
+                    ((InstructionContainer)subExprBlock.getSubBlocks()[0]).
+                        setInstruction(e);
 		    exprs[i] = e;
-                    ih = ih.combine(2, e);
 		}
+                block = sequBlock;
             }
         } catch (NullPointerException ex) {
-            return null;
+            return false;
         } catch (ClassCastException ex) {
-            return null;
+            return false;
         }
-        if(Decompiler.isVerbose && params > 0)
+        if(jode.Decompiler.isVerbose && params > 0)
             System.err.print("x");
-        return ih.combine(params+1, new Expression(op, exprs));
+
+        ((InstructionContainer) flow.lastModified).setInstruction
+            (new Expression(op, exprs));
+        flow.lastModified.replace(block);
+        return true;
     }
 }
+

jode/jode/flow/EmptyBlock.java

@@ -18,27 +18,20 @@
  */
 
 package jode.flow;
+import jode.TabbedPrintWriter;
 
 /**
  * This is the structured block for an empty block.
  */
 public class EmptyBlock extends StructuredBlock {
-    Instruction instr;
+    public EmptyBlock() {
-
-    SimpleInstruction(Instruction instr) {
-        in = new Vector();
-        out = new Vector();
-        this.instr = instr;
-        if (instr instanceof LocalVarOperator) {
-            LocalVarOperator varOp = (LocalVarOperator) instr;
-            if (varOp.isRead())
-                in.addElement(varOp.getLocalInfo());
-            else /* if (varOp.isWrite()) */
-                out.addElement(varOp.getLocalInfo());
     }
+
+    public EmptyBlock(Jump jump) {
+        setJump(jump);
     }
 
-    public void dumpSource(TabbedPrintWriter writer) 
+    public void dumpInstruction(TabbedPrintWriter writer) 
 	throws java.io.IOException
     {
         writer.println("/* empty */");

jode/jode/flow/FinallyBlock.java

@@ -17,6 +17,7 @@
  */
 
 package jode.flow;
+import jode.TabbedPrintWriter;
 
 /**
  * A FinallyBlock represents the instructions and try catch regions
@@ -28,5 +29,9 @@ package jode.flow;
  * region, so we have to take care of this.
  */
 
-public FinallyBlock extends StructuredBlock {
+public class FinallyBlock extends StructuredBlock {
+    public void dumpInstruction(TabbedPrintWriter writer) 
+        throws java.io.IOException {
+        writer.println("IMPLEMENT FINALLY");
+    }
 }

jode/jode/flow/FlowBlock.java

@@ -18,6 +18,9 @@
  */
 
 package jode.flow;
+import java.util.*;
+import jode.TabbedPrintWriter;
+import jode.Expression;
 
 /**
  * A flow block is the structure of which the flow graph consists.  A
@@ -30,12 +33,24 @@ package jode.flow;
  */
 public class FlowBlock {
 
+    static FlowBlock END_OF_METHOD = 
+        new FlowBlock(Integer.MAX_VALUE, 0, new EmptyBlock());
+
+    static {
+        END_OF_METHOD.label = "END_OF_METHOD";
+    }
+
     /**
      * The starting address of this flow block.  This is mainly used
      * to produce the source code in code order.
      */
     int addr;
 
+    /**
+     * The length of the structured block, only needed at the beginning.
+     */
+    int length;
+
     /**
      * The outermost structructed block in this flow block.
      */
@@ -58,6 +73,25 @@ public class FlowBlock {
      */
     Vector predecessors;
 
+    /**
+     * The default constructor.  Creates a new flowblock containing
+     * only the given structured block.
+     */
+    public FlowBlock(int addr, int length, StructuredBlock block) {
+        this.addr = addr;
+        this.length = length;
+        this.block = block;
+        lastModified = block;
+        predecessors = new Vector(); // filled in later
+        successors   = new Vector();
+        block.setFlowBlock(this);
+        block.fillSuccessors(successors);
+    }
+
+    public int getNextAddr() {
+        return addr+length;
+    }
+    
     /**
      * This method optimizes the jumps to successor.
      * Returns the new appendBlock, it may have changed.
@@ -65,106 +99,185 @@ public class FlowBlock {
     public StructuredBlock optimizeJumps(FlowBlock successor,
                                          StructuredBlock appendBlock) {
         Enumeration enum = successors.elements();
+    next_jump:
         while (enum.hasMoreElements()) {
             Jump jump = (Jump) enum.nextElement();
 
             if (jump == null || jump.destination != successor)
-                continue;
+                continue next_jump;
 
+        same_jump: while(true) {
             /* if the jump is the jump of the appendBlock, skip it.
              */
-            if (jump == appendBlock.jump)
+            if (jump.prev == appendBlock)
-                continue;
+                continue next_jump;
 
-            /* Note: jump.parent.outer != null, since appendBlock is
+            /* Note: jump.prev.outer != null, since appendBlock is
-             * an outer block of jump.parent
+             * an outer block of jump.prev
              */
         
             /* remove all jumps to the successor which have the successor
-             * as getNextFlowBlock().  */
+             * as getNextFlowBlock().  
-            if (jump.parent.outer.getNextFlowBlock(jump.parent) == successor)
+             */
-                jump.parent.removeJump();
+            if (jump.prev.outer.getNextFlowBlock(jump.prev) == successor) {
+                jump.prev.removeJump();
+                continue next_jump;
+            }
 
             /* replace all conditional jumps to the successor, which
              * are followed by a block which has the end of the block
              * as normal successor, with "if (not condition) block".  
              */
-            if (jump.parent instanceof ConditionalBlock &&
+            if (jump.prev instanceof EmptyBlock &&
-                jump.parent.outer instanceof SequentialBlock && 
+                jump.prev.outer instanceof ConditionalBlock) {
-                jump.parent.outer.getSubBlocks()[0] = jump.parent &&
+
-                jump.parent.outer.getNextFlowBlock() == successor) {
+                StructuredBlock prev = jump.prev;
+                ConditionalBlock cb = (ConditionalBlock) prev.outer;
+                jode.Instruction instr = cb.getInstruction();
+
+
+                if ((cb == appendBlock || 
+                     cb.outer.getNextFlowBlock(cb) == successor 
+                     /*XXX jumpMayBeChanged()??? */) &&
+                    instr instanceof jode.Expression) {
 
-                ConditionalBlock cb = (ConditionalBlock) jump.parent;
+                    cb.setInstruction(((jode.Expression)instr).negate());
-                cb.removeJump();
+                    prev.removeJump();
+                    prev.moveJump(cb);
+                    continue next_jump;
+                }
+
+                /* cb.outer is not null,
+                 * since appendBlock outers cb */
                 
+                if (cb.outer instanceof SequentialBlock && 
+                    cb.outer.getSubBlocks()[0] == cb &&
+                    (cb.outer.getNextFlowBlock() == successor ||
+                     cb.outer.jumpMayBeChanged()) &&
+                    instr instanceof jode.Expression) {
                     SequentialBlock sequBlock = 
                         (SequentialBlock) cb.outer;
                     
                     IfThenElseBlock newIfBlock = 
-                    new IfThenElseBlock(cb.getCondition().negate(),
+                        new IfThenElseBlock(((jode.Expression)instr).negate());
-                                        sequBlock.getSubBlocks()[1], null);
 
                     newIfBlock.replace(sequBlock);
+                    newIfBlock.setThenBlock(sequBlock.getSubBlocks()[1]);
 
+                    newIfBlock.moveJump(sequBlock);
                     if (appendBlock == sequBlock)
                         appendBlock = newIfBlock;
-                continue;
+
+                    if (newIfBlock.getNextFlowBlock() != successor &&
+                        newIfBlock != appendBlock) {
+                        newIfBlock.moveJump(prev);
+                        continue same_jump;
+                    } else {
+                        prev.removeJump();
+                        continue next_jump;
+                    }
+                }
+            }
+
+            /* if there are jumps in an if-then block, which
+             * have as normal successor the end of the if-then block, and
+             * the if-then block is followed by a single block, then replace
+             * the if-then block with a if-then-else block and remove the
+             * unconditional jump.
+             */
+            StructuredBlock elseBlock = 
+                jump.prev.outer.getNextBlock(jump.prev);
+            if (elseBlock != null && 
+                elseBlock.outer != null &&
+                elseBlock.outer instanceof SequentialBlock &&
+                elseBlock.outer.getSubBlocks()[0] instanceof IfThenElseBlock &&
+                (elseBlock.outer.getNextFlowBlock() == successor ||
+                 elseBlock.outer.jumpMayBeChanged())) {
+                IfThenElseBlock ifBlock = 
+                    (IfThenElseBlock)elseBlock.outer.getSubBlocks()[0];
+                if (ifBlock.getSubBlocks().length == 1) {
+
+                    elseBlock.outer.removeJump();
+                    ifBlock.replace(elseBlock.outer);
+                    if (appendBlock == elseBlock.outer)
+                        appendBlock = ifBlock;
+                    ifBlock.moveJump(jump.prev);
+                    ifBlock.setElseBlock(elseBlock);
+                    continue same_jump;
+                }
             }
 
             /* if the successor is the dummy return instruction, replace all
              * jumps with a return.
              */
-            if (successor.block.instanceof ReturnBlock) {
+            if (successor == END_OF_METHOD) {
                 SequentialBlock sequBlock = new SequentialBlock();
-                StructuredBlock prevBlock = jump.parent;
+                StructuredBlock prevBlock = jump.prev;
                 prevBlock.removeJump();
                 sequBlock.replace(prevBlock);
                 sequBlock.setFirst(prevBlock);
                 sequBlock.setSecond(new ReturnBlock());
-                continue;
+                continue next_jump;
             }
 
             /* If this is a conditional jump, the first instruction of
              * a while and the condition of the while is true,  use
              * the condition as while condition.
              */
+            if (jump.prev instanceof EmptyBlock &&
+                jump.prev.outer instanceof ConditionalBlock &&
+                jump.prev.outer.jump == null) {
+
+                StructuredBlock prev = jump.prev;
+                ConditionalBlock cb = (ConditionalBlock) prev.outer;
+                jode.Instruction instr = cb.getInstruction();
 
                 /* This is the first instruction in a while block */
-            if (jump.parent instanceof ConditionalBlock &&
+                if (cb.outer instanceof SequentialBlock &&
-                jump.parent.outer instanceof SequentialBlock &&
+                    cb.outer.getSubBlocks()[0] == cb &&
-                jump.parent.outer.getSubBlocks()[0] == this &&
+                    cb.outer.outer instanceof LoopBlock) {
-                jump.parent.outer.outer instanceof LoopBlock) {
+
-                ConditionalBlock cb = (ConditionalBlock) jump.parent;
                     LoopBlock loopBlock = (LoopBlock) cb.outer.outer;
                     if (loopBlock.getCondition() == LoopBlock.TRUE &&
                         loopBlock.getType() != LoopBlock.DOWHILE &&
-                    loopBlock.getNextFlowBlock() == successor) {
+                        loopBlock.getNextFlowBlock() == successor &&
-
+                        instr instanceof Expression) {
-                    cb.removeJump();
+                        
-                    loopBlock.setCondition(cb);
+                        prev.removeJump();
+                        loopBlock.setCondition(((Expression)instr).negate());
+                        if (cb.outer.jump != null) {
+                            if (cb.outer.getSubBlocks()[1].jump != null)
+                                cb.outer.removeJump();
+                            else
+                                cb.outer.getSubBlocks()[1].moveJump(cb.outer);
+                        }
                         cb.outer.getSubBlocks()[1].replace(cb.outer);
                         /* cb and cb.outer are not used any more */
                         /* Note that cb.outer != appendBlock because
                          * appendBlock contains loopBlock
                          */
+                        continue next_jump;
                     }
                 }
+
                 /* Now the same for the empty loop. In this case there is
                  * no sequential block.  
                  */
-            if (jump.parent instanceof ConditionalBlock &&
+                if (cb.outer instanceof LoopBlock) {
-                jump.parent.outer instanceof LoopBlock) {
-                ConditionalBlock cb = (ConditionalBlock) jump.parent;
                     LoopBlock loopBlock = (LoopBlock) cb.outer;
                     if (loopBlock.getCondition() == LoopBlock.TRUE &&
                         loopBlock.getType() != LoopBlock.DOWHILE &&
-                    loopBlock.getNextFlowBlock() == successor) {
+                        loopBlock.getNextFlowBlock() == successor &&
+                        instr instanceof Expression) {
+                        
+                        prev.removeJump();
+                        loopBlock.setCondition(((Expression)instr).negate());
                         
-                    cb.removeJump();
-                    loopBlock.setCondition(cb);
                         EmptyBlock empty = new EmptyBlock();
                         empty.replace(cb);
                         /* cb is not used any more */
+                        continue next_jump;
+                    }
                 }
             }
                 
@@ -178,61 +291,32 @@ public class FlowBlock {
              * succesor, so that the above succeeds.
              */
             int breaklevel = 0;
-            for (StructuredBlock surrounder = jump.parent.outer;
+            for (StructuredBlock surrounder = jump.prev.outer;
-                 surrounder != null; surrounder = surrounder.outer) {
+                 surrounder != null && surrounder != appendBlock.outer; 
+                 surrounder = surrounder.outer) {
                 if (surrounder instanceof BreakableBlock) {
                     breaklevel++;
                     if (surrounder.getNextFlowBlock() == successor ||
                         surrounder.jumpMayBeChanged()) {
 
                         SequentialBlock sequBlock = new SequentialBlock();
-                        StructuredBlock prevBlock = jump.parent;
+                        StructuredBlock prevBlock = jump.prev;
-                        if (surrounder.getNextFlowBlock() != successor) {
+                        if (surrounder.getNextFlowBlock() != successor)
-                            surrounder.jump = jump;
+                            surrounder.moveJump(prevBlock);
-                            prevBlock.jump = null;
+                        else
-                            jump.parent = surrounder;
-                        } else {
                             prevBlock.removeJump();
-                        }
+
                         sequBlock.replace(prevBlock);
                         sequBlock.setFirst(prevBlock);
-                        sequBlock.setSecond(new BreakBlock(surrounder, 
+                        sequBlock.setSecond
+                            (new BreakBlock((BreakableBlock) surrounder, 
                                             breaklevel > 1));
-                        continue;
+                        continue next_jump;
                     }
                 }
             }
             
-
+            continue next_jump;
-            /* if there are jumps in an if-then block, which
-             * have as normal successor the end of the if-then block, and
-             * the if-then block is followed by a single block, then replace
-             * the if-then block with a if-then-else block and remove the
-             * unconditional jump.
-             */
-            StructuredBlock elseBlock = 
-                jump.parent.outer.getNextBlock(jump.parent);
-            if (elseBlock != null && 
-                elseBlock.outer != null &&
-                elseBlock.outer instanceof SequentialBlock &&
-                elseBlock.outer.getSubBlocks()[0] instanceof IfThenElseBlock &&
-                (elseBlock.outer.getNextFlowBlock() == successor ||
-                 elseBlock.outer.jumpMayBeChanged())) {
-                IfThenElseBlock ifBlock = 
-                    (IfThenElseBlock)elseBlock.outer.getSubBlocks()[0];
-                if (ifBlock.getElseBlock() == null) {
-                    if (elseBlock.getNextFlowBlock() != successor) {
-                        elseBlock.outer.jump = jump;
-                        jump.parent.jump = null;
-                        jump.parent = elseBlock.outer;
-                    } else {
-                        jump.parent.removeJump();
-                    }
-                    ifBlock.replace(elseBlock.outer);
-                    ifBlock.setElseBlock(elseBlock);
-                    if (appendBlock = elseBlock.outer)
-                        appendBlock = ifBlock;
-                }
         }
         }
         return appendBlock;
@@ -250,17 +334,17 @@ public class FlowBlock {
          */
         VariableSet allOuts = new VariableSet();
         VariableSet intersectOut = null;
-        Enumeration enum = successors;
+        Enumeration enum = successors.elements();
-        while (enum.hasMoreElement()) {
+        while (enum.hasMoreElements()) {
             Jump jump = (Jump) enum.nextElement();
             if (jump == null || jump.destination != successor)
                 continue;
             
-            allOuts.union(jump.parent.out);
+            allOuts.union(jump.prev.out);
             if (intersectOut == null) 
-                intersectOut = jump.parent.out;
+                intersectOut = jump.prev.out;
             else
-                intersectOut = intersectOut.intersect(jump.parent.out);
+                intersectOut = intersectOut.intersect(jump.prev.out);
         }
         
         /* Now work on each block of the successor */
@@ -350,7 +434,12 @@ public class FlowBlock {
       *    return_n
       */
 
-    public boolean doT1 {
+    /**
+     * Search for an apropriate successor.
+     * @return the successor with smallest address
+     *  or null if there isn't a successor at all.
+     */
+    public FlowBlock getSuccessor() {
         /* search successor with smallest addr. */
         Enumeration enum = successors.elements();
         FlowBlock succ = null;
@@ -363,16 +452,67 @@ public class FlowBlock {
                 succ = fb;
             }
         }
-        if (succ == null) {
+        return succ;
-            /* There are no successors at all */
+    }
-            return false;
+
+    public void checkConsistent() {
+        if (block.outer != null || block.flowBlock != this) {
+            throw new RuntimeException("Inconsistency");
+        }
+        block.checkConsistent();
+        Enumeration enum = successors.elements();
+        while (enum.hasMoreElements()) {
+            Jump jump = (Jump) enum.nextElement();
+            if (jump == null)
+                continue;
+                
+            if (jump.prev.flowBlock != this ||
+                jump.prev.jump != jump)
+                throw new RuntimeException("Inconsistency");
+
+            StructuredBlock sb = jump.prev;
+            while (sb != block) {
+                if (sb.outer == null)
+                    throw new RuntimeException("Inconsistency");
+                StructuredBlock[] blocks = sb.outer.getSubBlocks();
+                int i;
+                for (i=0; i<blocks.length; i++)
+                    if (blocks[i] == sb)
+                        break;
+                if (i == blocks.length)
+                    throw new RuntimeException("Inconsistency");
+                sb = sb.outer;
+            }
+        }
     }
 
-        /* check if this successor has only this block as predecessor. */
+    /**
-        /* if not, return false. */
+     * Do a T1 transformation with succ if possible.  It is possible,
-        if (succ.predecessors.size() != 1)
+     * iff succ has exactly this block as predecessor.
+     * @param succ the successor block, must be a valid successor of this
+     * block, i.e. not null
+     */
+    public boolean doT1(FlowBlock succ) {
+        /* check if this successor has only this block as predecessor. 
+         * if the predecessor is not unique, return false. */
+        if (succ != END_OF_METHOD && 
+            (succ.predecessors.size() != 1 ||
+             succ.predecessors.elementAt(0) != this))
             return false;
 
+        try {
+            TabbedPrintWriter writer = 
+                new TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("doing T1 analysis on: "+getLabel());
+            block.dumpSource(writer);
+            checkConsistent();
+            System.err.println("and "+succ.getLabel());
+            succ.block.dumpSource(writer);
+            succ.checkConsistent();
+        } catch (java.io.IOException ex) {}
+
+
         /* First find the innermost block that contains all jumps to this
          * successor and the last modified block.
          */
@@ -380,10 +520,10 @@ public class FlowBlock {
         StructuredBlock appendBlock = lastModified;
         while(enum.hasMoreElements()) {
             Jump jump = (Jump) enum.nextElement();
-            if (jump == null || jump.destination != successors)
+            if (jump == null || jump.destination != succ)
                 continue;
 
-            while (!appendBlock.contains(jump.parent))
+            while (!appendBlock.contains(jump.prev))
                 appendBlock = appendBlock.outer;
             /* appendBlock can't be null now, because the
              * outermost block contains every structured block.  
@@ -391,14 +531,19 @@ public class FlowBlock {
         }
 
         /* Update the in/out-Vectors now */
-        updateInOut(successor, true);
+        updateInOut(succ, true);
+
 
         /* The switch "fall through" case: if the appendBlock is a
          * switch, and the successor is the address of a case, and all
          * other successors are inside the block preceding that case.  
          */
-        if (case != null) {
+        StructuredBlock precedingcase = null;
-            SwitchBlock switchBlock = (StructuredBlock) appendBlock;
+        StructuredBlock nextcase = null;
+        /*XXX*/
+        if (succ == END_OF_METHOD) {
+        } else if (nextcase != null) {
+            SwitchBlock switchBlock = (SwitchBlock) appendBlock;
 
             /* Now put the succ.block into the next case.
              */
@@ -408,50 +553,118 @@ public class FlowBlock {
 
             /* Do the following modifications on the struct block. */
             appendBlock = precedingcase;
+            succ.block.setFlowBlock(this);
 
         } else {
 
-            /* Prepare the unification of the blocks: Make sure that
+            /* Prepare the unification of the blocks: Make sure if
-             * appendBlock has a successor outside of this block.  This is
+             * possible that appendBlock has a successor outside of
-             * always possible, because it contains lastModified.  
+             * this block.  
-             */
+             *
+             * This doesn't change the semantics, since appendBlock
+             * is the last block that could be modified. 
+             * XXX (is this true for switches)*/
             if (appendBlock.jump == null) {
-                /* assert(appendBlock.jump.getNextFlowBlock() != null) */
+                Jump jump = new Jump(succ);
-                appendBlock.setJump(appendBlock.getNextFlowBlock());
+                appendBlock.setJump(jump);
+                successors.addElement(jump);
             }
 
             /* Now unify the blocks: Create a new SequentialBlock
              * containing appendBlock and successor.block.  Then replace
              * appendBlock with the new sequential block.
              */
-            StructuredBlock outer = appendBlock.outer;
+            SequentialBlock sequBlock = 
-            StructuredBlock sequBlock = 
+                new SequentialBlock();
-                new SequentialBlock(appendBlock, switchBlock);
+            sequBlock.replace(appendBlock);
-            outer.replaceSubBlock(appendBlock, sequBlock);
+            sequBlock.setFirst(appendBlock);
-            sequBlock.outer = outer;
+            sequBlock.setSecond(succ.block);
+            succ.block.setFlowBlock(this);
+        }
+
+        /* Merge the sucessors from the successing flow block
+         */
+        enum = succ.successors.elements();
+        while (enum.hasMoreElements()) {
+            Jump jump = (Jump) enum.nextElement();
+            if (jump == null)
+                continue;
+            successors.addElement(jump);
+            if (jump.destination.predecessors.contains(succ)) {
+                /*XXX comment and make clearer, better etc.*/
+                jump.destination.predecessors.removeElement(succ);
+                if (!jump.destination.predecessors.contains(this))
+                    jump.destination.predecessors.addElement(this);
+            }
         }
 
+        try {
+            TabbedPrintWriter writer = 
+                new TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("before optimizeJump: "+getLabel());
+            block.dumpSource(writer);
+            checkConsistent();
+        } catch (java.io.IOException ex) {}
+            checkConsistent();
         /* Try to eliminate as many jumps as possible.
          */
 
-        optimizeJumps(succ, appendBlock);
+        appendBlock = optimizeJumps(succ, appendBlock);
 
+        try {
+            TabbedPrintWriter writer = 
+                new TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("after optimizeJump: "+getLabel());
+            block.dumpSource(writer);
+            checkConsistent();
+        } catch (java.io.IOException ex) {}
+        System.err.println("XXX");
+            checkConsistent();
         /* Now remove the jump of the appendBlock if it points to successor.
          */
-
+        if (appendBlock.jump != null &&
-        if (appendBlock.jump == succ)
+            appendBlock.jump.destination == succ)
             appendBlock.removeJump();
 
         /* If there are further jumps, put a do/while(0) block around
          * appendBlock and replace every remaining jump with a break
          * to the do/while block.
          */
-        
+        LoopBlock doWhileFalse = null;
-        /* Merge the sucessors from the successing flow block
+        enum = successors.elements();
-         */
-        enum = succ.successors.elements();
         while (enum.hasMoreElements()) {
-            successors.addElement(enum.nextElement());
+            Jump jump = (Jump) enum.nextElement();
+
+            if (jump == null || jump.destination != succ)
+                continue;
+
+            if (doWhileFalse == null)
+                doWhileFalse = new LoopBlock(LoopBlock.DOWHILE, 
+                                             LoopBlock.FALSE);
+
+            int breaklevel = 1;
+            for (StructuredBlock surrounder = jump.prev.outer;
+                 surrounder != appendBlock.outer; 
+                 surrounder = surrounder.outer) {
+                if (surrounder instanceof BreakableBlock) {
+                    breaklevel++;
+                }
+            }
+
+            SequentialBlock sequBlock = new SequentialBlock();
+            StructuredBlock prevBlock = jump.prev;
+            prevBlock.removeJump();
+            
+            sequBlock.replace(prevBlock);
+            sequBlock.setFirst(prevBlock);
+            sequBlock.setSecond(new BreakBlock(doWhileFalse, breaklevel > 1));
+        }
+
+        if (doWhileFalse != null) {
+            doWhileFalse.replace(appendBlock);
+            doWhileFalse.setBody(appendBlock);
         }
         
         /* Believe it or not: Now the rule, that the first part of a
@@ -466,6 +679,22 @@ public class FlowBlock {
 
         /* Set last modified to correct value.  */
         lastModified = succ.lastModified;
+
+        /* Set addr+length to (semi-)correct value */
+        if (succ.addr < addr)
+            addr = succ.addr;
+        length += succ.length;
+
+        /* T1 transformation succeeded */
+        try {
+            TabbedPrintWriter writer = 
+                new TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("T1 succeeded:");
+            block.dumpSource(writer);
+            checkConsistent();
+        } catch (java.io.IOException ex) {}
+        return true;
     }
 
     public boolean doT2() {
@@ -474,9 +703,21 @@ public class FlowBlock {
          * considered yet, return false.  The second condition make
          * sure that the while isn't created up to the first continue.
          */
+        if (!predecessors.contains(this)
+            /* || complicated second condition XXX */ )
+            return false;
+
+        try {
+            TabbedPrintWriter writer = 
+                new TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("doing T2 analysis on: "+getLabel());
+            block.dumpSource(writer);
+            checkConsistent();
+        } catch (java.io.IOException ex) {}
 
         /* Update the in/out-Vectors now */
-        updateInOut(successor, false);
+        updateInOut(this, false);
 
         /* If there is only one jump to the beginning and it is the
          * last jump and (there is a do/while(0) block surrounding
@@ -485,26 +726,145 @@ public class FlowBlock {
          * do/while(0) with a for(;;last_instr) resp. create a new one
          * and replace breaks to do/while with continue to for.  
          */
+        /* XXX implement above */
+        /* XXX condition for do/while(cond) blocks */
         {
             /* Otherwise: */
 
             /* create a new while(true) block.
              */
+            StructuredBlock bodyBlock = block;
+            
+            /* Prepare the unification of the blocks: Make sure that
+             * bodyBlock has a jump.  */
+            if (bodyBlock.jump == null) {
+                Jump jump = new Jump(this);
+                bodyBlock.setJump(jump);
+                successors.addElement(jump);
+            }
+
+            LoopBlock whileBlock = 
+                new LoopBlock(LoopBlock.WHILE, LoopBlock.TRUE);
+
+            whileBlock.replace(bodyBlock);
+            whileBlock.setBody(bodyBlock);
 
             /* Try to eliminate as many jumps as possible.
              */
-            optimizeJumps(this, block);
+            bodyBlock = optimizeJumps(this, bodyBlock);
 
             /* Now remove the jump of block if it points to this.
              */
+            if (bodyBlock.jump != null &&
+                bodyBlock.jump.destination == this)
+                bodyBlock.removeJump();
 
             /* if there are further jumps to this, replace every jump with a
              * continue to while block and return true.  
              */
+            Enumeration enum = successors.elements();
+            while (enum.hasMoreElements()) {
+                Jump jump = (Jump) enum.nextElement();
+                
+                if (jump == null || jump.destination != this)
+                    continue;
+                
+                int continuelevel = 1;
+                for (StructuredBlock surrounder = jump.prev.outer;
+                     surrounder != null;
+                     surrounder = surrounder.outer) {
+                    if (surrounder instanceof LoopBlock) {
+                        continuelevel++;
+                    }
+                }
+                
+                SequentialBlock sequBlock = new SequentialBlock();
+                StructuredBlock prevBlock = jump.prev;
+                prevBlock.removeJump();
+                
+                sequBlock.replace(prevBlock);
+                sequBlock.setFirst(prevBlock);
+                sequBlock.setSecond(new ContinueBlock(whileBlock, 
+                                                      continuelevel > 1));
+            }
+            lastModified = whileBlock;
+        }
+
+        /* remove ourself from the predecessor list.
+         */
+        predecessors.removeElement(this);
+
+        /* T2 analysis succeeded */
+        try {
+            TabbedPrintWriter writer = 
+                new TabbedPrintWriter(System.err, "    ");
+            writer.tab();
+            System.err.println("T2 succeded:");
+            block.dumpSource(writer);
+            checkConsistent();
+        } catch (java.io.IOException ex) {}
+
+        return true;
+    }
+
+    /**
+     * Resolves the destinations of all jumps.
+     */
+    public void resolveJumps(FlowBlock[] instr) {
+        Enumeration enum = successors.elements();
+        while (enum.hasMoreElements()) {
+            Jump jump = (Jump) enum.nextElement();
+            if (jump.destAddr == -1) 
+                jump.destination = END_OF_METHOD;
+            else
+                jump.destination = instr[jump.destAddr];
+            if (!jump.destination.predecessors.contains(this))
+                jump.destination.predecessors.addElement(this);
         }
     }
 
     public void removeSuccessor(Jump jump) {
         successors.setElementAt(null, successors.indexOf(jump));
     }
+
+
+    /**
+     * Print the source code for this structured block.  This handles
+     * everything that is unique for all structured blocks and calls
+     * dumpInstruction afterwards.
+     * @param writer The tabbed print writer, where we print to.
+     */
+    public void dumpSource(TabbedPrintWriter writer)
+        throws java.io.IOException
+    {
+        if (label != null) {
+            writer.untab();
+            writer.println(label+":");
+            writer.tab();
+        }
+        block.dumpSource(writer);
+        FlowBlock succ = getSuccessor();
+        if (succ != null)
+            succ.dumpSource(writer);
+    }
+
+    /**
+     * The serial number for labels.
+     */
+    static int serialno = 0;
+
+    /**
+     * The label of this instruction, or null if it needs no label.
+     */
+    String label = null;
+
+    /**
+     * Returns the label of this block and creates a new label, if
+     * there wasn't a label previously.
+     */
+    public String getLabel() {
+        if (label == null)
+            label = "flow_"+(serialno++)+"_";
+        return label;
+    }
 }

jode/jode/flow/IfThenElseBlock.java

@@ -16,6 +16,8 @@
  * $Id$
  */
 package jode.flow;
+import jode.Instruction;
+import jode.TabbedPrintWriter;
 
 /**
  * An IfThenElseBlock is the structured block representing an if
@@ -53,6 +55,7 @@ public class IfThenElseBlock extends StructuredBlock {
     public void setThenBlock(StructuredBlock thenBlock) {
         this.thenBlock = thenBlock;
         thenBlock.outer = this;
+        thenBlock.setFlowBlock(flowBlock);
     }
 
     /** 
@@ -62,6 +65,7 @@ public class IfThenElseBlock extends StructuredBlock {
     public void setElseBlock(StructuredBlock elseBlock) {
         this.elseBlock = elseBlock;
         elseBlock.outer = this;
+        elseBlock.setFlowBlock(flowBlock);
     }
     
     /* The implementation of getNext[Flow]Block is the standard
@@ -73,7 +77,7 @@ public class IfThenElseBlock extends StructuredBlock {
      * @param newBlock the new sub block.
      * @return false, if oldBlock wasn't a direct sub block.
      */
-    boolean replaceSubBlock(StructuredBlock oldBlock, 
+    public boolean replaceSubBlock(StructuredBlock oldBlock, 
                             StructuredBlock newBlock) {
         if (thenBlock == oldBlock)
             thenBlock = newBlock;
@@ -89,22 +93,29 @@ public class IfThenElseBlock extends StructuredBlock {
      * called only once, because it remembers which local variables
      * were declared.
      */
-    public void dumpSource(TabbedPrintWriter writer)
+    public void dumpInstruction(TabbedPrintWriter writer)
         throws java.io.IOException
     {
         boolean needBrace = ! (thenBlock instanceof InstructionBlock);
-        writer.println("if ("+cond.toString()+")"+needBrace?" {":"");
+        writer.println("if ("+cond.toString()+")"+(needBrace?" {":""));
         writer.tab();
         thenBlock.dumpSource(writer);
         writer.untab();
         if (elseBlock != null) {
             writer.print(needBrace ? "} " : "");
-            needBrace = ! (thenBlock instanceof InstructionBlock);
+            if (elseBlock instanceof IfThenElseBlock
-            writer.println("else"+needBrace?" {":"");
+                /* XXX && No variables are declared XXX*/) {
+                needBrace = false;
+                writer.print("else ");
+                elseBlock.dumpSource(writer);
+            } else {
+                needBrace = ! (elseBlock instanceof InstructionBlock);
+                writer.println("else" + (needBrace ? " {" : ""));
                 writer.tab();
                 elseBlock.dumpSource(writer);
                 writer.untab();
             }
+        }
         if (needBrace)
             writer.println("}");
     }
@@ -112,12 +123,12 @@ public class IfThenElseBlock extends StructuredBlock {
     /**
      * Returns all sub block of this structured block.
      */
-    StructuredBlock[] getSubBlocks() {
+    public StructuredBlock[] getSubBlocks() {
         if (elseBlock == null) {
-            StructuredBlock result = { thenBlock };
+            StructuredBlock[] result = { thenBlock };
             return result;
         } else {
-            StructuredBlock result = { thenBlock, elseBlock };
+            StructuredBlock[] result = { thenBlock, elseBlock };
             return result;
         }
     }
@@ -132,7 +143,7 @@ public class IfThenElseBlock extends StructuredBlock {
             return false;
 
         if (elseBlock != null && elseBlock.jump == null &&
-            !elseBlock.jumpMayBeChanged)
+            !elseBlock.jumpMayBeChanged())
             return false;
         return true;
     }

jode/jode/flow/InstructionBlock.java

@@ -16,33 +16,52 @@
  * $Id$
  */
 package jode.flow;
+import jode.*;
 
 /**
  * This is the structured block for atomic instructions.
  */
-public class InstructionBlock extends StructuredBlock {
+public class InstructionBlock extends StructuredBlock 
+    implements InstructionContainer {
     Instruction instr;
 
-    InstructionBlock(Instruction instr) {
+    public InstructionBlock(Instruction instr) {
-        in = new Vector();
-        out = new Vector();
         this.instr = instr;
         if (instr instanceof LocalVarOperator) {
             LocalVarOperator varOp = (LocalVarOperator) instr;
-            if (varOp.isRead())
+            if (varOp.isRead()) {
                 in.addElement(varOp.getLocalInfo());
-            else /* if (varOp.isWrite()) */
+            }
             out.addElement(varOp.getLocalInfo());
         }
     }
 
-    public void dumpSource(TabbedPrintWriter writer) 
+    public InstructionBlock(Instruction instr, Jump jump) {
+        this(instr);
+        setJump(jump);
+    }
+
+    /**
+     * Get the underlying instruction.
+     * @return the underlying instruction.
+     */
+    public Instruction getInstruction() {
+        return instr;
+    }
+
+    /**
+     * Change the underlying instruction.
+     * @param instr the new underlying instruction.
+     */
+    public void setInstruction(Instruction instr) {
+        this.instr = instr;
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
 	throws java.io.IOException
     {
-        if (!(instr instanceof NopOperator)) {
         if (instr.getType() != MyType.tVoid)
             writer.print("push ");
         writer.println(instr.toString()+";");
     }
 }
-}

jode/jode/flow/InstructionContainer.java

@@ -0,0 +1,34 @@
+/* InstructionContainer (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+package jode.flow;
+
+/**
+ * This is a method for block containing a single instruction.
+ */
+public interface InstructionContainer {
+    /**
+     * Get the contained instruction.
+     * @return the contained instruction.
+     */
+    public jode.Instruction getInstruction();
+    /**
+     * Set the contained instruction.
+     * @param instr the new instruction.
+     */
+    public void setInstruction(jode.Instruction instr);
+}

jode/jode/flow/Jump.java

@@ -25,19 +25,35 @@ public class Jump {
      * The structured block that precedes this jump.
      */
     StructuredBlock prev;
-    /**
-     * The flow block, where this jump lies in
-     */
-    FlowBlock parent;
     /**
      * The destination block of this jump.
      */
     FlowBlock destination;
+    /**
+     * The destination address, in case the destination block is not yet
+     * known.  
+     */
+    int destAddr;
+
+    public Jump (int destAddr) {
+        this.destAddr = destAddr;
+    }
+
+    public Jump (FlowBlock dest) {
+        this.destination = dest;
+    }
 
     /**
      * Returns true if this jump has jsr or monitorexit attachments.  
      */
     boolean hasAttachments() {
-    }
+        return false;
     }
 
+    /**
+     * Returns a string describing the jsr or monitorexit attachments.  
+     */
+    String describeAttachments() {
+        return "";
+    }
+}

jode/jode/flow/LoopBlock.java

@@ -0,0 +1,156 @@
+/* 
+ * LoopBlock  (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+import jode.*;
+
+/**
+ * This is the structured block for an Loop block.
+ */
+public class LoopBlock extends BreakableBlock {
+
+    public static final int WHILE = 0;
+    public static final int DOWHILE = 1;
+    public static final int FOR = 2;
+
+    public static final Instruction TRUE = 
+        new Expression(new ConstOperator(MyType.tBoolean, "1"), 
+                       new Expression[0]);
+
+    public static final Instruction FALSE = 
+        new Expression(new ConstOperator(MyType.tBoolean, "0"), 
+                       new Expression[0]);
+
+    /**
+     * The condition.  Must be of boolean type.
+     */
+    Instruction cond;
+    /**
+     * The init instruction, only valid if type == FOR.
+     */
+    Instruction init;
+    /**
+     * The increase instruction, only valid if type == FOR.
+     */
+    Instruction incr;
+
+    /**
+     * The type of the loop.  This must be one of DOWHILE, WHILE or FOR.
+     */
+    int type;
+
+    /**
+     * The body of this loop.  This is always a valid block and not null 
+     */
+    StructuredBlock bodyBlock;
+
+    /**
+     * Returns the block where the control will normally flow to, when
+     * the given sub block is finished (<em>not</em> ignoring the jump
+     * after this block). (This is overwritten by SequentialBlock and
+     * SwitchBlock).  If this isn't called with a direct sub block,
+     * the behaviour is undefined, so take care.  
+     * @return null, if the control flows to another FlowBlock.  */
+    public StructuredBlock getNextBlock(StructuredBlock subBlock) {
+        return this;
+    }
+
+    public FlowBlock getNextFlowBlock(StructuredBlock subBlock) {
+        return null;
+    }
+    
+    public LoopBlock(int type, Instruction cond) {
+        this.type = type;
+        this.cond = cond;
+        this.mayChangeJump = (cond == TRUE);
+    }
+
+    public void setBody(StructuredBlock body) {
+        bodyBlock = body;
+        bodyBlock.outer = this;
+        body.setFlowBlock(flowBlock);
+    }
+
+    public Instruction getCondition() {
+        return cond;
+    }
+
+    public void setCondition(Instruction cond) {
+        this.cond = cond;
+        mayChangeJump = false;
+    }
+
+    public int getType() {
+        return type;
+    }
+
+    public void setType(int type) {
+        this.type = type;
+    }
+
+    /**
+     * Replaces the given sub block with a new block.
+     * @param oldBlock the old sub block.
+     * @param newBlock the new sub block.
+     * @return false, if oldBlock wasn't a direct sub block.
+     */
+    public boolean replaceSubBlock(StructuredBlock oldBlock, 
+                            StructuredBlock newBlock) {
+        if (bodyBlock == oldBlock)
+            bodyBlock = newBlock;
+        else
+            return false;
+        return true;
+    }
+
+    /**
+     * Returns all sub block of this structured block.
+     */
+    public StructuredBlock[] getSubBlocks() {
+        StructuredBlock[] result = { bodyBlock };
+        return result;
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+	throws java.io.IOException
+    {
+        boolean needBrace = ! (bodyBlock instanceof InstructionBlock);
+        switch (type) {
+        case WHILE:
+            writer.print("while ("+cond.toString()+")");
+            break;
+        case DOWHILE:
+            writer.print("do");
+            break;
+        case FOR:
+            writer.print("for ("+(init != null ? init.toString() : "") +
+                         "; "+cond.toString()+"; "+incr.toString()+")");
+            break;
+        }
+        writer.println( needBrace?" {": "");
+        writer.tab();
+        bodyBlock.dumpSource(writer);
+        writer.untab();
+        if (type == DOWHILE)
+            writer.println((needBrace?"} ": "")+
+                           "while ("+cond.toString()+")");
+        else if (needBrace)
+            writer.println("}");
+    }
+}

jode/jode/flow/RawTryCatchBlock.java

@@ -17,6 +17,7 @@
  */
 
 package jode.flow;
+import jode.TabbedPrintWriter;
 
 /**
  * A RawTryCatchBlock is created for each exception in the
@@ -39,7 +40,7 @@ package jode.flow;
  * @see SynchronizedBlock
  */
 
-public RawTryCatchBlock extends StructuredBlock {
+public class RawTryCatchBlock extends StructuredBlock {
 
     /**
      * An unconditional jump to the EndBlock.
@@ -55,5 +56,10 @@ public RawTryCatchBlock extends StructuredBlock {
      * The type of the exception that is catched. This is null for a
      * synchronized/finally block 
      */
-    Type type;
+    jode.MyType type;
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+        throws java.io.IOException {
+        writer.println("IMPLEMENT FINALLY");
+    }
 }

jode/jode/flow/RemoveEmpty.java

@@ -0,0 +1,85 @@
+/* 
+ * RemoveEmpty (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+import jode.Instruction;
+import jode.NopOperator;
+
+public class RemoveEmpty implements Transformation {
+    
+    public boolean transform (FlowBlock fb) {
+        return (removeNop(fb) || removeEmpty(fb));
+    }
+
+    public boolean removeNop(FlowBlock flow) {
+        StructuredBlock block;
+        SequentialBlock sequBlock;
+        Instruction instr;
+        try {
+            block = flow.lastModified;
+            if (!(((InstructionContainer)block).getInstruction() 
+                  instanceof NopOperator))
+                return false;
+            
+            sequBlock = (SequentialBlock)block.outer;
+            if (sequBlock.getSubBlocks()[1] != block)
+                return false;
+
+            InstructionBlock prev = 
+                (InstructionBlock) sequBlock.getSubBlocks()[0];
+            if (prev.jump != null)
+                return false;
+            instr = (Instruction) prev.getInstruction();
+        } catch (NullPointerException ex) {
+            return false;
+        } catch (ClassCastException ex) {
+            return false;
+        }
+        ((InstructionContainer)block).setInstruction(instr);
+        block.replace(sequBlock);
+        flow.lastModified = block;
+        return true;
+    }
+
+    public boolean removeEmpty(FlowBlock flow) {
+        StructuredBlock lastBlock = flow.lastModified;
+        if (lastBlock instanceof EmptyBlock &&
+            lastBlock.outer instanceof SequentialBlock &&
+            lastBlock.outer.getSubBlocks()[1] == lastBlock) {
+            
+            StructuredBlock block = lastBlock.outer.getSubBlocks()[0];
+            block.replace(block.outer);
+            if (block.jump == null)
+                block.moveJump(lastBlock);
+            else
+                lastBlock.removeJump();
+            flow.lastModified = block;
+            return true;
+        }
+        if (lastBlock.outer instanceof SequentialBlock &&
+            lastBlock.outer.getSubBlocks()[0] instanceof EmptyBlock &&
+            lastBlock.outer.getSubBlocks()[0].jump == null) {
+            
+            lastBlock.replace(lastBlock.outer);
+            flow.lastModified = lastBlock;
+            return true;
+        }
+        return false;
+    }
+}

jode/jode/flow/ReturnBlock.java

@@ -0,0 +1,42 @@
+/* 
+ * ReturnBlock  (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+import jode.TabbedPrintWriter;
+import jode.Instruction;
+
+/**
+ * This is the structured block for an Return block.
+ */
+public class ReturnBlock extends StructuredBlock {
+    Instruction instr = null;
+
+    public ReturnBlock() {
+    }
+
+    public ReturnBlock(Instruction instr) {
+        this.instr = instr;
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+	throws java.io.IOException
+    {
+        writer.println("return" + (instr == null ? "" : " " + instr) + ";");
+    }
+}

jode/jode/flow/SequentialBlock.java

@@ -16,6 +16,7 @@
  * $Id$
  */
 package jode.flow;
+import jode.TabbedPrintWriter;
 
 /**
  * A sequential block combines exactly two structured blocks to a new
@@ -24,21 +25,23 @@ package jode.flow;
  * condition is temporarily violated, while the t1 transformation is
  * done.
  */
-public class SequentialBlock {
+public class SequentialBlock extends StructuredBlock {
     StructuredBlock[] subBlocks;
 
     public SequentialBlock() {
         subBlocks = new StructuredBlock[2];
     }
 
-    public setFirst(StructuredBlock sb) {
+    public void setFirst(StructuredBlock sb) {
         subBlocks[0] = sb;
         sb.outer = this;
+        sb.setFlowBlock(flowBlock);
     }
 
-    public setSecond(StructuredBlock sb) {
+    public void setSecond(StructuredBlock sb) {
         subBlocks[1] = sb;
         sb.outer = this;
+        sb.setFlowBlock(flowBlock);
     }
 
     /**
@@ -48,25 +51,32 @@ public class SequentialBlock {
      * SwitchBlock).  If this isn't called with a direct sub block,
      * the behaviour is undefined, so take care.  
      * @return null, if the control flows to another FlowBlock.  */
-    StructuredBlock getNextBlock(StructuredBlock subBlock) {
+    public StructuredBlock getNextBlock(StructuredBlock subBlock) {
         if (subBlock == subBlocks[0])
             return subBlocks[1];
         return getNextBlock();
     }
 
-    FlowBlock getNextFlowBlock(StructuredBlock subBlock) {
+    public FlowBlock getNextFlowBlock(StructuredBlock subBlock) {
         if (subBlock == subBlocks[0])
             return null;
         return getNextFlowBlock();
     }
     
+    public void dumpInstruction(TabbedPrintWriter writer)
+        throws java.io.IOException
+    {
+        subBlocks[0].dumpSource(writer);
+        subBlocks[1].dumpSource(writer);
+    }
+
     /**
      * Replaces the given sub block with a new block.
      * @param oldBlock the old sub block.
      * @param newBlock the new sub block.
      * @return false, if oldBlock wasn't a direct sub block.
      */
-    boolean replaceSubBlock(StructuredBlock oldBlock, 
+    public boolean replaceSubBlock(StructuredBlock oldBlock, 
                             StructuredBlock newBlock) {
         for (int i=0; i<2; i++) {
             if (subBlocks[i] == oldBlock) {
@@ -80,7 +90,7 @@ public class SequentialBlock {
     /**
      * Returns all sub block of this structured block.
      */
-    StructuredBlock[] getSubBlocks() {
+    public StructuredBlock[] getSubBlocks() {
         return subBlocks;
     }
 
@@ -93,7 +103,3 @@ public class SequentialBlock {
         return (subBlocks[1].jump != null || subBlocks[1].jumpMayBeChanged());
     }
 }
-
-
-
-

jode/jode/flow/StructuredBlock.java

@@ -18,6 +18,7 @@
  */
 
 package jode.flow;
+import jode.TabbedPrintWriter;
 
 /**
  * A structured block is the building block of the source programm.
@@ -49,8 +50,8 @@ package jode.flow;
 public abstract class StructuredBlock {
     /* Invariants:
      * in.intersection(out) = empty
-     * outer != null => flowblock = outer.flowblock
+     * outer != null => flowBlock = outer.flowBlock
-     * outer == null => flowblock.block = this
+     * outer == null => flowBlock.block = this
      * jump  == null => outer != null
      * either getNextBlock() != null 
      *     or getNextFlowBlock() != null or outer == null
@@ -65,7 +66,7 @@ public abstract class StructuredBlock {
      * path from the start of the current flow block, on which the
      * local variable is never assigned
      */
-    VariableSet in; 
+    VariableSet in = new VariableSet(); 
 
     /**
      * The out locals.  This are the locals, which must be overwritten
@@ -74,14 +75,14 @@ public abstract class StructuredBlock {
      * structured block contain a (unconditional) assignment to this
      * local
      */
-    VariableSet out;
+    VariableSet out = new VariableSet();
 
     /**
      * The variable set containing all variables that must be defined
      * in this block (or maybe an outer block, this changes as the
      * blocks are put together).
      */
-    VariableSet defineHere;
+    VariableSet defineHere = new VariableSet();
 
     /**
      * The surrounding structured block.  If this is the outermost
@@ -91,7 +92,7 @@ public abstract class StructuredBlock {
     /**
      * The flow block in which this structured block lies.
      */
-    FlowBlock flowblock;
+    FlowBlock flowBlock;
     
     /** 
      * The jump that follows on this block, or null if there is no
@@ -104,15 +105,19 @@ public abstract class StructuredBlock {
      * Returns the block where the control will normally flow to, when
      * this block is finished (not ignoring the jump after this block).
      */
-    StructuredBlock getNextBlock() {
+    public StructuredBlock getNextBlock() {
         if (jump != null)
             return null;
         if (outer != null)
-            outer.getNextBlock(this);
+            return outer.getNextBlock(this);
-        else 
         return null;
     }
 
+    public void setJump(Jump jump) {
+        this.jump = jump;
+        jump.prev = this;
+    }
+
     /**
      * Returns the flow block where the control will normally flow to,
      * when this block is finished (not ignoring the jump after this
@@ -120,12 +125,11 @@ public abstract class StructuredBlock {
      * @return null, if the control flows into a non empty structured
      * block or if this is the outermost block.
      */
-    FlowBlock getNextFlowBlock() {
+    public FlowBlock getNextFlowBlock() {
         if (jump != null)
             return jump.destination;
         if (outer != null)
-            outer.getNextFlowBlock(this);
+            return outer.getNextFlowBlock(this);
-        else 
         return null;
     }
 
@@ -135,12 +139,11 @@ public abstract class StructuredBlock {
      * @return null, if everything is okay, and a diagnostic message that
      * should be put in a comment otherwise.
      */
-    String checkJump(Jump jump) {
+    public String checkJump(Jump jump) {
         if (outer != null)
             return outer.checkJump(jump);
-        else if (jump.hasAttachments())
+        if (jump.hasAttachments())
-            return "Unknown attachments: "+jump.describeAttachments()
+            return "Unknown attachments: "+jump.describeAttachments();
-        else
         return null;
     }
 
@@ -151,11 +154,11 @@ public abstract class StructuredBlock {
      * SwitchBlock).  If this isn't called with a direct sub block,
      * the behaviour is undefined, so take care.  
      * @return null, if the control flows to another FlowBlock.  */
-    StructuredBlock getNextBlock(StructuredBlock subBlock) {
+    public StructuredBlock getNextBlock(StructuredBlock subBlock) {
         return getNextBlock();
     }
 
-    FlowBlock getNextFlowBlock(StructuredBlock subBlock) {
+    public FlowBlock getNextFlowBlock(StructuredBlock subBlock) {
         return getNextFlowBlock();
     }
 
@@ -165,7 +168,7 @@ public abstract class StructuredBlock {
      * @param newBlock the new sub block.
      * @return false, if oldBlock wasn't a direct sub block.
      */
-    boolean replaceSubBlock(StructuredBlock oldBlock, 
+    public boolean replaceSubBlock(StructuredBlock oldBlock, 
                                    StructuredBlock newBlock) {
         return false;
     }
@@ -173,7 +176,7 @@ public abstract class StructuredBlock {
     /**
      * Returns all sub block of this structured block.
      */
-    StructuredBlock[] getSubBlocks() {
+    public StructuredBlock[] getSubBlocks() {
         return new StructuredBlock[0];
     }
 
@@ -182,19 +185,21 @@ public abstract class StructuredBlock {
      * @param child the block which should be contained by this block.
      * @return false, if child is null, or is not contained in this block.
      */
-    boolean contains(StructuredBlock child) {
+    public boolean contains(StructuredBlock child) {
         while (child != this && child != null)
             child = child.outer;
         return (child == this);
     }
 
-
     /**
-     * Removes the jump after this structured block.  This does also update
+     * Removes the given jump if it is our jump.  This does also
-     * the successors vector of the flow block.
+     * update the successors vector of the flow block.  
+     *
+     * @param jump  The jump that should be removed.  
      */
     public void removeJump() {
         if (jump != null) {
+            jump.prev = null;
             flowBlock.removeSuccessor(jump);
             jump = null;
         }
@@ -202,24 +207,17 @@ public abstract class StructuredBlock {
 
     /**
      * This function replaces sb with this block.  It copies outer and
-     * the following jump from sb, and updates them, so they know that
+     * from sb, and updates the outer block, so it knows that sb was
-     * sb was replaced. 
+     * replaced.  You have to replace sb.outer or mustn't use sb
-     * The jump field of sb is removed afterwards.  You have to replace
+     * anymore.
-     * sb.outer or mustn't use sb anymore.
+     * @param sb The structured block that should be replaced.  */
-     * @param sb  The structured block that should be replaced.
-     */
     public void replace(StructuredBlock sb) {
         in = sb.in;
         out = sb.out;
         defineHere = sb.defineHere;
         outer = sb.outer;
         flowBlock = sb.flowBlock;
-        jump = sb.jump;
 
-        if (jump != null) {
-            jump.parent = this;
-            sb.jump = null;
-        }
         if (outer != null) {
             outer.replaceSubBlock(sb, this);
         } else {
@@ -227,6 +225,19 @@ public abstract class StructuredBlock {
         }
     }
 
+    /**
+     * This function moves the jumps from sb to this block.  
+     * The jump field of sb is removed afterwards.  
+     * @param sb  The structured block whose jump is copied.
+     */
+    public void moveJump(StructuredBlock sb) {
+        jump = sb.jump;
+        if (jump != null) {
+            jump.prev = this;
+            sb.jump = null;
+        }
+    }
+
     /**
      * Determines if there is a sub block, that flows through to the end
      * of this block.  If this returns true, you know that jump is null.
@@ -236,25 +247,78 @@ public abstract class StructuredBlock {
         return false;
     }
 
+    public void checkConsistent() {
+        StructuredBlock[] subs = getSubBlocks();
+        for (int i=0; i<subs.length; i++) {
+            if (subs[i].outer != this ||
+                subs[i].flowBlock != flowBlock) {
+                throw new RuntimeException("Inconsistency");
+            }
+            subs[i].checkConsistent();
+        }
+        if (jump != null && 
+            (jump.prev != this || 
+             !flowBlock.successors.contains(jump) ||
+             !jump.destination.predecessors.contains(flowBlock))) {
+                throw new RuntimeException("Inconsistency");
+        }
+    }
+
     /**
-     * Get the unique predecessor which mustn't be a conditional jump
+     * Set the flow block of this block and all sub blocks.
-     * @return the predecessor or null if there isn't a such a thing
+     * @param flowBlock the new flow block
      */
-    public StructuredBlock getSimpleUniquePredecessor() {
+    public void setFlowBlock(FlowBlock flowBlock) {
-        SequentialBlock sequ;
+        if (this.flowBlock != flowBlock) {
-        if (outer instanceof SequentialBlock) {
+            this.flowBlock = flowBlock;
-            if (outer.getSubBlocks()[1] == this)
+            StructuredBlock[] subs = getSubBlocks();
-                return outer.getSubBlocks()[0];
+            for (int i=0; i<subs.length; i++) {
-            else if (outer.outer instanceof SequentialBlock)
+                subs[i].setFlowBlock(flowBlock);
-                return outer.outer.getSubBlocks[0];
+            }
+        }
+    }
+
+    /**
+     * Put all the successors of this block and all subblocks into
+     * the given vector.
+     * @param succs The vector, the successors should be stored to.
+     */
+    public void fillSuccessors(java.util.Vector succs) {
+        succs.addElement(jump);
+        StructuredBlock[] subs = getSubBlocks();
+        for (int i=0; i<subs.length; i++) {
+            subs[i].fillSuccessors(succs);
         }
-        return null;
     }
     
     /**
-     * Print the source code for this structured block.  This may be
+     * Print the source code for this structured block.  This handles
-     * called only once, because it remembers which local variables
+     * everything that is unique for all structured blocks and calls
-     * were declared.  */
+     * dumpInstruction afterwards.
-    public abstract void dumpSource(TabbedPrintWriter writer)
+     * @param writer The tabbed print writer, where we print to.
+     */
+    public void dumpSource(TabbedPrintWriter writer)
+        throws java.io.IOException
+    {
+        /* XXX declare variables needed in this block */
+        dumpInstruction(writer);
+        if (jump != null) {
+            if (jump.destination == null)
+                writer.println ("GOTO null-ptr!!!!!");
+            else {
+                writer.println("GOTO "+jump.destination.getLabel());
+                if (jump.prev != this)
+                    writer.println("GOTO has wrong prev");
+            }
+        }
+    }
+
+
+    /**
+     * Print the instruction expressing this structured block.
+     * @param writer The tabbed print writer, where we print to.
+     */
+    public abstract void dumpInstruction(TabbedPrintWriter writer)
         throws java.io.IOException;
 }
+

jode/jode/flow/SwitchBlock.java

@@ -0,0 +1,72 @@
+/* 
+ * SwitchBlock  (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+import jode.TabbedPrintWriter;
+
+/**
+ * This is the structured block for an empty block.
+ */
+public class SwitchBlock extends BreakableBlock {
+    int[] cases;
+    StructuredBlock[] caseBlocks;
+
+    public SwitchBlock(int[] cases, int[] dests) {
+        this.cases = cases;
+        this.caseBlocks = new StructuredBlock[dests.length];
+        for (int i=0; i<dests.length; i++) {
+            /* XXX sort the destinations, multi-cases? */
+            caseBlocks[i] = new EmptyBlock(new Jump(dests[i]));
+        }
+        this.jump = null;
+        mayChangeJump = true;
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+	throws java.io.IOException
+    {
+        writer.println("switch (/* XXX implement */)");
+    }
+
+
+    /**
+     * Returns the block where the control will normally flow to, when
+     * the given sub block is finished (<em>not</em> ignoring the jump
+     * after this block). (This is overwritten by SequentialBlock and
+     * SwitchBlock).  If this isn't called with a direct sub block,
+     * the behaviour is undefined, so take care.  
+     * @return null, if the control flows to another FlowBlock.  */
+    public StructuredBlock getNextBlock(StructuredBlock subBlock) {
+        /*XXX*/
+        return getNextBlock();
+    }
+
+    public FlowBlock getNextFlowBlock(StructuredBlock subBlock) {
+        /*XXX*/
+        return getNextFlowBlock();
+    }
+
+    /**
+     * Returns all sub block of this structured block.
+     */
+    public StructuredBlock[] getSubBlocks() {
+        return caseBlocks;
+    }
+}
+

jode/jode/flow/ThrowBlock.java

@@ -0,0 +1,42 @@
+/* 
+ * ThrowBlock  (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+import jode.TabbedPrintWriter;
+import jode.Instruction;
+
+/**
+ * This is the structured block for an Throw block.
+ */
+public class ThrowBlock extends StructuredBlock {
+    Instruction instr = null;
+
+    public ThrowBlock() {
+    }
+
+    public ThrowBlock(Instruction instr) {
+        this.instr = instr;
+    }
+
+    public void dumpInstruction(TabbedPrintWriter writer) 
+	throws java.io.IOException
+    {
+        writer.println("throw" + (instr == null ? "" : " " + instr) + ";");
+    }
+}

jode/jode/flow/Transformation.java

@@ -0,0 +1,24 @@
+/* 
+ * Transformation (c) 1998 Jochen Hoenicke
+ *
+ * You may distribute under the terms of the GNU General Public License.
+ *
+ * IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+ * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE 
+ * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * $Id$
+ */
+
+package jode.flow;
+
+public interface Transformation {
+    public boolean transform(FlowBlock flowBlock);
+}

jode/jode/flow/VariableSet.java

@@ -15,7 +15,8 @@
  *
  * $Id$
  */
-package jode.Flow;
+package jode.flow;
+import jode.LocalInfo;
 
 /**
  * This class represents a set of Variables, which are mainly used in
@@ -39,7 +40,7 @@ public class VariableSet extends java.util.Vector {
      * Adds a local variable to the variable set.
      * @param li The local variable of type LocalInfo.
      */
-    public addElement(LocalInfo li) {
+    public void addElement(LocalInfo li) {
         super.addElement((Object)li);
     }
 
@@ -54,7 +55,7 @@ public class VariableSet extends java.util.Vector {
             LocalInfo li1 = ((LocalInfo) elementData[i]).getLocalInfo();
             for (int j=0; j<vs.elementCount; j++) {
                 LocalInfo li2 = ((LocalInfo) vs.elementData[j]).getLocalInfo();
-                if (li1.getSlot() = li2.getSlot()) {
+                if (li1.getSlot() == li2.getSlot()) {
                     li1.combineWith(li2);
                 }
             }
@@ -72,7 +73,7 @@ public class VariableSet extends java.util.Vector {
             LocalInfo li1 = ((LocalInfo) elementData[i]).getLocalInfo();
             for (int j=0; j<vs.elementCount; j++) {
                 LocalInfo li2 = ((LocalInfo) vs.elementData[j]).getLocalInfo();
-                if (li1.getSlot() = li2.getSlot()) {
+                if (li1.getSlot() == li2.getSlot()) {
                     if (!intersection.contains(li1))
                         intersection.addElement(li1);
                     if (!intersection.contains(li2))
@@ -106,7 +107,7 @@ public class VariableSet extends java.util.Vector {
      * Add the other variable set to the current, except when the slot
      * is already in the current set.  
      */
-    public void union(VariableSet vs) {
+    public void add(VariableSet vs) {
         int oldSize = elementCount;
     iloop:
         for (int i=0; i< vs.elementCount; i++) {
@@ -132,7 +133,7 @@ public class VariableSet extends java.util.Vector {
         /* We count from top to bottom to have easier reorganization.
          * Note, that the variables have not to be in any particular
          * order.  */
-        int newCount = elementCount
+        int newCount = elementCount;
         for (int i=newCount-1; i>=0; i--) {
             LocalInfo li1 = (LocalInfo) elementData[i];
             for (int j=0; j<vs.elementCount; j++) {