ComplexExpression removed, complete rework, StoreInstruction/LValue splittet.

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@755 379699f6-c40d-0410-875b-85095c16579e

jode/jode/expr/ArrayLengthOperator.java

@@ -23,33 +23,25 @@ import jode.decompiler.TabbedPrintWriter;
 
 public class ArrayLengthOperator extends Operator {
 
-    Type arrayType;
-
     public ArrayLengthOperator() {
         super(Type.tInt, 0);
-        arrayType = Type.tArray(Type.tUnknown);
+	initOperands(1);
     }
 
     public int getPriority() {
         return 950;
     }
 
-    public int getOperandCount() {
-        return 1;
-    }
-
-    public Type getOperandType(int i) {
-        return arrayType;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tArray(Type.tUnknown));
     }
 
-    public void setOperandType(Type[] types) {
-        arrayType = arrayType.intersection(types[0]);
+    public void updateType() {
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, 900);
+	subExpressions[0].dumpExpression(writer, 900);
 	writer.print(".length");
     }
 }

jode/jode/expr/ArrayLoadOperator.java

@@ -22,46 +22,37 @@ import jode.type.Type;
 import jode.type.ArrayType;
 import jode.decompiler.TabbedPrintWriter;
 
-public class ArrayLoadOperator extends SimpleOperator {
+public class ArrayLoadOperator extends Operator {
     String value;
 
     public ArrayLoadOperator(Type type) {
-        super(type, 0, 2);
-        operandTypes[0] = Type.tArray(type);
-        operandTypes[1] = Type.tInt;
+        super(type, 0);
+	initOperands(2);
     }
 
     public int getPriority() {
         return 950;
     }
 
-    /**
-     * Sets the return type of this operator.
-     */
-    public void setType(Type type) {
-        if (!type.equals(this.type)) {
-            super.setType(type);
-            operandTypes[0] = Type.tArray(type);
-        }
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(Type.tArray(type)));
+	subExpressions[1].setType(Type.tSubType(Type.tInt));
     }
 
-    public void setOperandType(Type[] t) {
-        super.setOperandType(t);
-        if (operandTypes[0] == Type.tError)
-            type = Type.tError;
-	else if (operandTypes[0] instanceof ArrayType)
-            type = type.intersection
-                (((ArrayType)operandTypes[0]).getElementType());
-        else
-            throw new jode.AssertError("No Array type: "+operandTypes[0]);
+    public void updateType() {
+	Type subType = Type.tSuperType(subExpressions[0].getType())
+	    .intersection(Type.tArray(type));
+	if (!(subType instanceof ArrayType))
+	    updateParentType(Type.tError);
+	else 
+	    updateParentType(((ArrayType)subType).getElementType());
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, 950);
+	subExpressions[0].dumpExpression(writer, 950);
 	writer.print("[");
-	operands[1].dumpExpression(writer, 0);
+	subExpressions[1].dumpExpression(writer, 0);
 	writer.print("]");
     }
 }

jode/jode/expr/ArrayStoreOperator.java

@@ -22,53 +22,40 @@ import jode.type.Type;
 import jode.type.ArrayType;
 import jode.decompiler.TabbedPrintWriter;
 
-public class ArrayStoreOperator extends StoreInstruction {
-    Type indexType;
-
-    public ArrayStoreOperator(Type type, int operator) {
-        super(type, operator);
-        indexType = Type.tInt;
-    }
+public class ArrayStoreOperator extends LValueExpression {
 
     public ArrayStoreOperator(Type type) {
-        this(type, ASSIGN_OP);
+        super(type);
+	initOperands(2);
     }
 
-
     public boolean matches(Operator loadop) {
         return loadop instanceof ArrayLoadOperator;
     }
 
-    public int getLValuePriority() {
+    public int getPriority() {
         return 950;
     }
 
-    public int getLValueOperandCount() {
-        return 2;
-    }
-
-    public Type getLValueOperandType(int i) {
-        if (i == 0)
-            return Type.tArray(lvalueType);
-        else
-            return indexType;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tArray(type));
+	subExpressions[1].setType(Type.tSubType(Type.tInt));
     }
 
-    public void setLValueOperandType(Type[] t) {
-        indexType = indexType.intersection(t[1]);
-        Type arrayType = t[0].intersection(Type.tArray(lvalueType));
-        if (arrayType == Type.tError)
-            lvalueType = Type.tError;
-	else
-            lvalueType = ((ArrayType)arrayType).getElementType();
+    public void updateType() {
+	Type subType = subExpressions[0].getType()
+	    .intersection(Type.tArray(type));
+	if (!(subType instanceof ArrayType))
+	    updateParentType(Type.tError);
+	else 
+	    updateParentType(((ArrayType)subType).getElementType());
     }
 
-    public void dumpLValue(TabbedPrintWriter writer,
-			   Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, 950);
+	subExpressions[0].dumpExpression(writer, 950);
 	writer.print("[");
-	operands[1].dumpExpression(writer, 0);
+	subExpressions[1].dumpExpression(writer, 0);
 	writer.print("]");
     }
 }

jode/jode/expr/BinaryOperator.java

@@ -21,14 +21,15 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class BinaryOperator extends SimpleOperator {
+public class BinaryOperator extends Operator {
 
     public BinaryOperator(Type type, int op) {
-        super(type, op, 2);
+        super(type, op);
+	initOperands(2);
     }
     
     public int getPriority() {
-        switch (operator) {
+        switch (operatorIndex) {
         case 1: case 2:
             return 610;
         case 3: case 4: case 5:
@@ -52,28 +53,42 @@ public class BinaryOperator extends SimpleOperator {
         throw new RuntimeException("Illegal operator");
     }
 
-    public int getOperandPriority(int i) {
-        return getPriority() + i;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(type));
+	subExpressions[1].setType(Type.tSubType(type));
     }
 
-    public Type getOperandType(int i) {
-        return type;
+    public void updateType() {
+	Type leftType  = Type.tSuperType(subExpressions[0].getType());
+	Type rightType = Type.tSuperType(subExpressions[1].getType());
+	subExpressions[0].setType(Type.tSubType(rightType));
+	subExpressions[1].setType(Type.tSubType(leftType));
+	/* propagate hints? XXX */
+	updateParentType(leftType.intersection(rightType));
     }
 
-    public void setOperandType(Type[] inputTypes) {
-	setType(inputTypes[0].intersection(inputTypes[1]));
+    public Expression negate() {
+        if (getOperatorIndex() == LOG_AND_OP || 
+	    getOperatorIndex() == LOG_OR_OP) {
+            setOperatorIndex(getOperatorIndex() ^ 1);
+            for (int i=0; i< 2; i++) {
+		subExpressions[i] = subExpressions[i].negate();
+                subExpressions[i].parent = this;
+            }
+            return this;
+        }
+	return super.negate();
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
 	return (o instanceof BinaryOperator) &&
-	    ((BinaryOperator)o).operator == operator;
+	    o.operatorIndex == operatorIndex;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, getPriority());
+	subExpressions[0].dumpExpression(writer, getPriority());
 	writer.print(getOperatorString());
-	operands[1].dumpExpression(writer, getPriority()+1);
+	subExpressions[1].dumpExpression(writer, getPriority()+1);
     }
 }

jode/jode/expr/CheckCastOperator.java

@@ -21,25 +21,27 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class CheckCastOperator extends SimpleOperator {
+public class CheckCastOperator extends Operator {
     Type castType;
 
     public CheckCastOperator(Type type) {
-        super(type, 0, 1);
+        super(type, 0);
         castType = type;
-        operandTypes[0] = Type.tUnknown;
+	initOperands(1);
     }
 
     public int getPriority() {
         return 700;
     }
 
-    public void setOperandType(Type[] type) {
-	super.setOperandType(type);
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tUObject);
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void updateType() {
+    }
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	writer.print("(");
 	writer.printType(castType);
@@ -49,12 +51,12 @@ public class CheckCastOperator extends SimpleOperator {
 	 * to the common super type before.  This cases always give a runtime
 	 * error, but we want to decompile even bad programs.
 	 */
-	Type superType = castType.getCastHelper(operands[0].getType());
+	Type superType = castType.getCastHelper(subExpressions[0].getType());
 	if (superType != null) {
 	    writer.print("(");
 	    writer.printType(superType);
 	    writer.print(") ");
 	}
-	operands[0].dumpExpression(writer, 700);
+	subExpressions[0].dumpExpression(writer, 700);
     }
 }

jode/jode/expr/CheckNullOperator.java

@@ -40,56 +40,38 @@ import jode.decompiler.TabbedPrintWriter;
  */
 
 public class CheckNullOperator extends Operator {
-
-    Type operandType;
     LocalInfo local;
 
     public CheckNullOperator(Type type, LocalInfo li) {
         super(type, 0);
-        operandType = type;
 	local = li;
-	local.setType(type);
-    }
-
-    public int getOperandCount() {
-	return 1;
+	initOperands(1);
     }
 
     public int getPriority() {
         return 200;
     }
 
-    public int getOperandPriority(int i) {
-        return 0;
-    }
-
-    public Type getOperandType(int i) {
-        return operandType;
+    public void updateSubTypes() {
+	local.setType(type);
+	subExpressions[0].setType(Type.tSubType(type));
     }
 
-    public void setOperandType(Type[] inputTypes) {
-        operandType = operandType.intersection(inputTypes[0]);
-        type = operandType;
-	local.setType(type);
+    public void updateType() {
+	Type newType = Type.tSuperType(subExpressions[0].getType())
+	    .intersection(type);
+	local.setType(newType);
+	updateParentType(newType);
     }
 
     public void removeLocal() {
 	local.remove();
     }
 
-    /**
-     * Sets the return type of this operator.
-     */
-    public void setType(Type newType) {
-        type = operandType = operandType.intersection(newType);
-	local.setType(type);
-    }
-
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	writer.print("("+local.getName()+" = ");
-	operands[0].dumpExpression(writer, 0);
+	subExpressions[0].dumpExpression(writer, 0);
 	writer.print(").getClass() != null ? "+local.getName()+" : null");
     }
 }

jode/jode/expr/ClassFieldOperator.java

@@ -34,8 +34,7 @@ public class ClassFieldOperator extends NoArgOperator {
         return 950;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	writer.printType(classType);
 	writer.print(".class");

jode/jode/expr/CombineableOperator.java

@@ -19,7 +19,15 @@
 
 package jode.expr;
 
-public interface CombineableOperator extends MatchableOperator {
+public interface CombineableOperator {
+    /**
+     * Returns the LValue.
+     */
+    public LValueExpression getLValue();
+    /**
+     * Checks if the loadOp is combinable with the lvalue.
+     */
+    public boolean lvalueMatches(Operator loadOp);
     /**
      * Make this operator return a value compatible with the loadOp
      * that it should replace.

jode/jode/expr/CompareBinaryOperator.java

@@ -21,10 +21,13 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class CompareBinaryOperator extends SimpleOperator {
+public class CompareBinaryOperator extends Operator {
+    Type compareType;
+
     public CompareBinaryOperator(Type type, int op) {
-        super(Type.tBoolean, op, 2);
-        operandTypes[0] = operandTypes[1] = type;
+        super(Type.tBoolean, op);
+	compareType = type;
+	initOperands(2);
     }
 
     public int getPriority() {
@@ -41,22 +44,41 @@ public class CompareBinaryOperator extends SimpleOperator {
         throw new RuntimeException("Illegal operator");
     }
 
-    public void setOperandType(Type[] inputTypes) {
-        super.setOperandType(inputTypes);
-        operandTypes[0] = operandTypes[1] = 
-            operandTypes[0].intersection(operandTypes[1]);
+    public Type getCompareType() {
+	return compareType;
+    }
+
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(compareType));
+	subExpressions[1].setType(Type.tSubType(compareType));
+    }
+
+    public void updateType() {
+	Type leftType  = Type.tSuperType(subExpressions[0].getType());
+	Type rightType = Type.tSuperType(subExpressions[1].getType());
+	subExpressions[0].setType(Type.tSubType(rightType));
+	subExpressions[1].setType(Type.tSubType(leftType));
+	/* propagate hints? XXX */
+    }
+
+    public Expression negate() {
+	if ((getType() != Type.tFloat && getType() != Type.tDouble)
+	    || getOperatorIndex() <= NOTEQUALS_OP) {
+            setOperatorIndex(getOperatorIndex() ^ 1);
+            return this;
+        } 
+        return super.negate();
     }
 
-    public boolean equals(Object o) {
-	return (o instanceof CompareBinaryOperator) &&
-	    ((CompareBinaryOperator)o).operator == operator;
+    public boolean opEquals(Operator o) {
+	return (o instanceof CompareBinaryOperator)
+	    && o.operatorIndex == operatorIndex;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, getPriority());
+	subExpressions[0].dumpExpression(writer, getPriority());
 	writer.print(getOperatorString());
-	operands[1].dumpExpression(writer, getPriority()+1);
+	subExpressions[1].dumpExpression(writer, getPriority()+1);
     }
 }

jode/jode/expr/CompareToIntOperator.java

@@ -21,35 +21,43 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class CompareToIntOperator extends SimpleOperator {
+public class CompareToIntOperator extends Operator {
+    boolean allowsNAN;
     boolean greaterOnNAN;
+    Type compareType;
 
     public CompareToIntOperator(Type type, boolean greaterOnNAN) {
-        super(Type.tInt, 0, 2);
-        operandTypes[0] = operandTypes[1] = type;
+        super(Type.tInt, 0);
+        compareType = type;
+	this.allowsNAN = (type == Type.tFloat || type == Type.tDouble);
 	this.greaterOnNAN = greaterOnNAN;
+	initOperands(2);
     }
 
     public int getPriority() {
         return 499;
     }
 
-    public void setOperandType(Type[] inputTypes) {
-        super.setOperandType(inputTypes);
-        Type operandType = operandTypes[0].intersection(operandTypes[1]);
-        operandTypes[0] = operandTypes[1] = operandType;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(compareType));
+	subExpressions[1].setType(Type.tSubType(compareType));
     }
 
-    public boolean equals(Object o) {
+    public void updateType() {
+    }
+
+    public boolean opEquals(Operator o) {
 	return (o instanceof CompareToIntOperator);
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException
     {
-        operands[0].dumpExpression(writer, 550);
-	writer.print(" <=>" + (greaterOnNAN ? 'g' : 'l') + ' ');
-        operands[1].dumpExpression(writer, 551);
+        subExpressions[0].dumpExpression(writer, 550);
+	writer.print(" <=>");
+	if (allowsNAN)
+	    writer.print(greaterOnNAN ? "g" : "l");
+	writer.print(" ");
+        subExpressions[1].dumpExpression(writer, 551);
     }
 }

jode/jode/expr/CompareUnaryOperator.java

@@ -21,13 +21,15 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class CompareUnaryOperator extends SimpleOperator {
+public class CompareUnaryOperator extends Operator {
     boolean objectType;
+    Type compareType;
 
     public CompareUnaryOperator(Type type, int op) {
-        super(Type.tBoolean, op, 1);
-        operandTypes[0] = type;
+        super(Type.tBoolean, op);
+        compareType = type;
         objectType = (type.isOfType(Type.tUObject));
+	initOperands(1);
     }
 
     public int getPriority() {
@@ -44,15 +46,69 @@ public class CompareUnaryOperator extends SimpleOperator {
         throw new RuntimeException("Illegal operator");
     }
 
-    public boolean equals(Object o) {
-	return (o instanceof CompareUnaryOperator) &&
-	    ((CompareUnaryOperator)o).operator == operator;
+    public Type getCompareType() {
+	return compareType;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(compareType));
+    }
+
+    public void updateType() {
+    }
+
+    public Expression simplify() {
+        if (subExpressions[0] instanceof CompareToIntOperator) {
+
+	    CompareToIntOperator cmpOp 
+		= (CompareToIntOperator) subExpressions[0];
+
+	    boolean negated = false;
+	    int opIndex = getOperatorIndex();
+	    if (cmpOp.allowsNAN && getOperatorIndex() > NOTEQUALS_OP) {
+		if (cmpOp.greaterOnNAN ==
+		    (opIndex == GREATEREQ_OP || opIndex == GREATER_OP)) {
+		    negated = true;
+		    opIndex ^= 1;
+		}
+	    }
+            Expression newOp = new CompareBinaryOperator
+                (cmpOp.compareType, opIndex)
+		.addOperand(cmpOp.subExpressions[1])
+		.addOperand(cmpOp.subExpressions[0]);
+
+	    if (negated)
+		return newOp.negate().simplify();
+	    return newOp.simplify();
+        }
+        if (subExpressions[0].getType().isOfType(Type.tBoolean)) {
+            /* xx == false */
+            if (getOperatorIndex() == EQUALS_OP)
+                return subExpressions[0].negate().simplify();
+            /* xx != false */
+            if (getOperatorIndex() == NOTEQUALS_OP)
+                return subExpressions[0].simplify();
+	}
+	return super.simplify();
+    }
+
+    public Expression negate() {
+	if ((getType() != Type.tFloat && getType() != Type.tDouble)
+	    || getOperatorIndex() <= NOTEQUALS_OP) {
+            setOperatorIndex(getOperatorIndex() ^ 1);
+            return this;
+        } 
+        return super.negate();
+    }
+
+    public boolean opEquals(Operator o) {
+	return (o instanceof CompareUnaryOperator)
+	    && o.getOperatorIndex() == getOperatorIndex();
+    }
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, getPriority());
+	subExpressions[0].dumpExpression(writer, getPriority());
 	writer.print(getOperatorString());
 	writer.print(objectType?"null":"0");
     }

jode/jode/expr/ConstOperator.java

@@ -34,11 +34,11 @@ public class ConstOperator extends NoArgOperator {
     public ConstOperator(Object constant) {
 	super(Type.tUnknown);
 	if (constant instanceof Boolean) {
-	    setType(Type.tBoolean);
+	    updateParentType(Type.tBoolean);
 	    constant = new Integer(((Boolean)constant).booleanValue() ? 1 : 0);
 	} else if (constant instanceof Integer) {
 	    int intVal = ((Integer) constant).intValue();
-	    setType 
+	    updateParentType 
 		((intVal == 0 || intVal == 1) ? tBoolConstInt
 		 : (intVal < Short.MIN_VALUE 
 		    || intVal > Character.MAX_VALUE) ? Type.tInt
@@ -54,15 +54,15 @@ public class ConstOperator extends NoArgOperator {
 		  ?    IntegerType.IT_S|IntegerType.IT_C|IntegerType.IT_I
 		  :    IntegerType.IT_C|IntegerType.IT_I));
 	} else if (constant instanceof Long)
-	    setType(Type.tLong);
+	    updateParentType(Type.tLong);
 	else if (constant instanceof Float)
-	    setType(Type.tFloat);
+	    updateParentType(Type.tFloat);
 	else if (constant instanceof Double)
-	    setType(Type.tDouble);
+	    updateParentType(Type.tDouble);
 	else if (constant instanceof String)
-	    setType(Type.tString);
+	    updateParentType(Type.tString);
 	else if (constant == null)
-	    setType(Type.tUObject);
+	    updateParentType(Type.tUObject);
 	else
 	    throw new IllegalArgumentException("Illegal constant type: "
 					       +constant.getClass());
@@ -77,7 +77,7 @@ public class ConstOperator extends NoArgOperator {
         return 1000;
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
 	if (o instanceof ConstOperator) {
 	    Object otherValue = ((ConstOperator)o).value;
 	    return value == null
@@ -173,7 +173,7 @@ public class ConstOperator extends NoArgOperator {
 	} else if (type.equals(Type.tString)) {
 	    return quoted(strVal);
         } else if (parent != null) {
-            int opindex = parent.getOperator().getOperatorIndex();
+            int opindex = parent.getOperatorIndex();
             if (opindex >= OPASSIGN_OP + ADD_OP
                 && opindex <  OPASSIGN_OP + ASSIGN_OP)
                 opindex -= OPASSIGN_OP;
@@ -204,8 +204,9 @@ public class ConstOperator extends NoArgOperator {
 	    && (type.getHint().equals(Type.tByte)
 		|| type.getHint().equals(Type.tShort))
             && !isInitializer
-	    && (parent == null 
-		|| parent.getOperator().getOperatorIndex() != ASSIGN_OP)) {
+	    && !(parent instanceof StoreInstruction
+		 && parent.getOperatorIndex() != ASSIGN_OP
+		 && parent.subExpressions[1] == this)) {
             /* One of the strange things in java.  All constants
              * are int and must be explicitly casted to byte,...,short.
              * But in assignments and initializers this cast is unnecessary.
@@ -217,8 +218,7 @@ public class ConstOperator extends NoArgOperator {
         return strVal;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	writer.print(toString());
     }

jode/jode/expr/ConstantArrayOperator.java

@@ -22,18 +22,16 @@ import jode.type.Type;
 import jode.type.ArrayType;
 import jode.decompiler.TabbedPrintWriter;
 
-public class ConstantArrayOperator extends NoArgOperator {
-
+public class ConstantArrayOperator extends Operator {
+    boolean isInitializer;
     ConstOperator empty;
-    Expression[] values;
     Type argType;
-    boolean isInitializer;
 
     public ConstantArrayOperator(Type type, int size) {
         super(type);
-        values = new Expression[size];
         argType = (type instanceof ArrayType) 
             ? Type.tSubType(((ArrayType)type).getElementType()) : Type.tError;
+
 	Object emptyVal;
 	if (argType == type.tError || argType.isOfType(Type.tUObject))
 	    emptyVal = null;
@@ -48,31 +46,33 @@ public class ConstantArrayOperator extends NoArgOperator {
 	else
 	    throw new IllegalArgumentException("Illegal Type: "+argType);
 	    
-        empty  = new ConstOperator(emptyVal);
+        empty = new ConstOperator(emptyVal);
 	empty.setType(argType);
         empty.makeInitializer();
+	initOperands(size);
+	for (int i=0; i < subExpressions.length; i++)
+	    setSubExpressions(i, empty);
     }
 
-    public void setType(Type newtype) {
-        super.setType(newtype);
-        Type newArgType = (this.type instanceof ArrayType) 
-            ? Type.tSubType(((ArrayType)this.type).getElementType()) 
-            : Type.tError;
-        if (!newArgType.equals(argType)) {
-            argType = newArgType;
-            empty.setType(argType);
-            for (int i=0; i< values.length; i++)
-                if (values[i] != null)
-                    values[i].setType(argType);
-        }
+    public void updateSubTypes() {
+        argType = (type instanceof ArrayType) 
+            ? Type.tSubType(((ArrayType)type).getElementType()) : Type.tError;
+	for (int i=0; i< subExpressions.length; i++)
+	    if (subExpressions[i] != null)
+		subExpressions[i].setType(argType);
+    }
+
+    public void updateType() {
     }
 
     public boolean setValue(int index, Expression value) {
-        if (index < 0 || index > values.length || values[index] != null)
+        if (index < 0 || 
+	    index > subExpressions.length || 
+	    subExpressions[index] != empty)
             return false;
         value.setType(argType);
         setType(Type.tSuperType(Type.tArray(value.getType())));
-        values[index] = value;
+        subExpressions[index] = value;
         value.parent = this;
         value.makeInitializer();
         return true;
@@ -87,15 +87,14 @@ public class ConstantArrayOperator extends NoArgOperator {
     }
 
     public Expression simplify() {
-	for (int i=0; i< values.length; i++) {
-	    if (values[i] != null)
-		values[i] = values[i].simplify();
+	for (int i=0; i< subExpressions.length; i++) {
+	    if (subExpressions[i] != null)
+		subExpressions[i] = subExpressions[i].simplify();
 	}
 	return this;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	if (!isInitializer) {
 	    writer.print("new ");
@@ -104,15 +103,15 @@ public class ConstantArrayOperator extends NoArgOperator {
 	}
 	writer.openBraceNoSpace();
 	writer.tab();
-        for (int i=0; i< values.length; i++) {
+        for (int i=0; i< subExpressions.length; i++) {
             if (i>0) {
 		if (i % 10 == 0)
 		    writer.println(",");
 		else
 		    writer.print(", ");
 	    }
-	    if (values[i] != null)
-		values[i].dumpExpression(writer, 0);
+	    if (subExpressions[i] != null)
+		subExpressions[i].dumpExpression(writer, 0);
 	    else
 		empty.dumpExpression(writer, 0);
         }

jode/jode/expr/ConstructorOperator.java

@@ -18,12 +18,15 @@
  */
 
 package jode.expr;
+import java.lang.reflect.Modifier;
+
 import jode.type.Type;
 import jode.type.NullType;
 import jode.type.ClassInterfacesType;
 import jode.type.MethodType;
 import jode.bytecode.ClassInfo;
 import jode.bytecode.InnerClassInfo;
+import jode.bytecode.Reference;
 import jode.Decompiler;
 import jode.decompiler.CodeAnalyzer;
 import jode.decompiler.ClassAnalyzer;
@@ -38,11 +41,22 @@ public class ConstructorOperator extends Operator
     ClassAnalyzer anonymousClass = null;
     boolean removedCheckNull = false;
 
+    public ConstructorOperator(Reference ref, CodeAnalyzer codeAna,
+			       boolean isVoid) {
+        super(isVoid ? Type.tVoid : Type.tType(ref.getClazz()), 0);
+        this.classType = Type.tType(ref.getClazz());
+        this.methodType = Type.tMethod(ref.getType());
+	this.codeAnalyzer = codeAna;
+	initOperands(methodType.getParameterTypes().length);
+	checkAnonymousClasses();
+    }
+
     public ConstructorOperator(InvokeOperator invoke, boolean isVoid) {
         super(isVoid ? Type.tVoid : invoke.getClassType(), 0);
         this.classType  = invoke.getClassType();
         this.methodType = invoke.getMethodType();
 	this.codeAnalyzer = invoke.codeAnalyzer;
+	initOperands(methodType.getParameterTypes().length);
 	checkAnonymousClasses();
     }
 
@@ -54,16 +68,6 @@ public class ConstructorOperator extends Operator
 	return codeAnalyzer;
     }
 
-    /**
-     * Checks if the value of the given expression can change, due to
-     * side effects in this expression.  If this returns false, the 
-     * expression can safely be moved behind the current expresion.
-     * @param expr the expression that should not change.
-     */
-    public boolean hasSideEffects(Expression expr) {
-	return expr.containsConflictingLoad(this);
-    }
-
     /**
      * Checks if the value of the operator can be changed by this expression.
      */
@@ -77,30 +81,46 @@ public class ConstructorOperator extends Operator
         return 950;
     }
 
-    public int getOperandCount() {
-        return methodType.getParameterTypes().length;
-    }
-
-    public int getOperandPriority(int i) {
-        return 0;
-    }
-
     public Type getClassType() {
         return classType;
     }
 
-    public Type getOperandType(int i) {
-        return methodType.getParameterTypes()[i];
+    public void updateSubTypes() {
+	Type[] paramTypes = methodType.getParameterTypes();
+	for (int i=0; i < paramTypes.length; i++)
+	    subExpressions[i].setType(Type.tSubType(paramTypes[i]));
     }
 
-    public void setOperandType(Type types[]) {
+    public void updateType() {
     }
 
     public Expression simplifyStringBuffer() {
+	if (getClassType() == Type.tStringBuffer) {
+	    if (methodType.getParameterTypes().length == 0)
+		return EMPTYSTRING;
+	    if (methodType.getParameterTypes().length == 1
+		&& methodType.getParameterTypes()[0].equals(Type.tString))
+                return subExpressions[0].simplifyString();
+        }
         return (getClassType() == Type.tStringBuffer)
             ? EMPTYSTRING : null;
     }
 
+    public Expression simplify() {
+	InnerClassInfo outer = getOuterClassInfo();
+	if (outer != null && outer.outer != null
+	    && !Modifier.isStatic(outer.modifiers)
+	    && (Decompiler.options & Decompiler.OPTION_INNER) != 0) {
+	    if (subExpressions[0] instanceof CheckNullOperator) {
+		CheckNullOperator cno = (CheckNullOperator) subExpressions[0];
+		cno.removeLocal();
+		subExpressions[0] = cno.subExpressions[0];
+		removedCheckNull = true;
+	    }
+	}
+	return super.simplify();
+    }
+
     public ClassInfo getClassInfo() {
 	if (classType instanceof ClassInterfacesType) {
 	    return ((ClassInterfacesType) classType).getClassInfo();
@@ -135,8 +155,7 @@ public class ConstructorOperator extends Operator
 	}
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 
 	int arg = 0;
@@ -146,8 +165,10 @@ public class ConstructorOperator extends Operator
 	    return;
 	}
 	InnerClassInfo outer = getOuterClassInfo();
-	if (outer != null && outer.name != null) {
-	    Expression outExpr = operands[arg++];
+	if (outer != null && outer.outer != null
+	    && !Modifier.isStatic(outer.modifiers)
+	    && (Decompiler.options & Decompiler.OPTION_INNER) != 0) {
+	    Expression outExpr = subExpressions[arg++];
 	    if (!removedCheckNull && !(outExpr instanceof ThisOperator))
 		writer.print("MISSING CHECKNULL");
 	    if (outExpr instanceof ThisOperator) {
@@ -180,10 +201,8 @@ public class ConstructorOperator extends Operator
         for (int i = arg; i < methodType.getParameterTypes().length; i++) {
             if (i>arg)
 		writer.print(", ");
-            operands[i].dumpExpression(writer, 0);
+            subExpressions[i].dumpExpression(writer, 0);
         }
         writer.print(")");
     }
 }
-
-

jode/jode/expr/ConvertOperator.java

@@ -27,29 +27,24 @@ public class ConvertOperator extends Operator {
     public ConvertOperator(Type from, Type to) {
         super(to, 0);
         this.from = from;
+	initOperands(1);
     }
     
     public int getPriority() {
         return 700;
     }
 
-    public int getOperandCount() {
-        return 1;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(from));
     }
-
-    public Type getOperandType(int i) {
-        return from;
-    }
-
-    public void setOperandType(Type[] inputTypes) {
-        from = from.intersection(inputTypes[0]);
+    public void updateType() {
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] ops) throws java.io.IOException {
+    public void dumpExpression(TabbedPrintWriter writer) 
+	throws java.io.IOException {
         writer.print("(");
 	writer.printType(type);
-        writer.print(")");
-	ops[0].dumpExpression(writer, 700);
+        writer.print(") ");
+	subExpressions[0].dumpExpression(writer, 700);
     }
 }

jode/jode/expr/Expression.java

@@ -21,50 +21,117 @@ package jode.expr;
 import jode.type.Type;
 import jode.GlobalOptions;
 import jode.decompiler.TabbedPrintWriter;
+import jode.flow.VariableSet;
 
 public abstract class Expression {
     protected Type type;
 
-    Expression parent = null;
+    Operator parent = null;
 
     public Expression(Type type) {
         this.type = type;
     }
 
+    public void setType(Type otherType) {
+	Type newType = otherType.intersection(type);
+	if (type.equals(newType))
+	    return;
+	if (newType == Type.tError && otherType != Type.tError) {
+	    GlobalOptions.err.println("setType: Type error in "+this
+				      +": merging "+type+" and "+otherType);
+	    if (parent != null)
+		GlobalOptions.err.println("\tparent is "+parent);
+	    if ((GlobalOptions.debuggingFlags
+		 & GlobalOptions.DEBUG_TYPES) != 0)
+		Thread.dumpStack();
+	}
+	type = newType;
+	if (type != Type.tError)
+	    updateSubTypes();
+    }
+
+    public void updateParentType(Type otherType) {
+	Type newType = otherType.intersection(type);
+	if (type.equals(newType))
+	    return;
+
+	if (newType == Type.tError) {
+	    if (otherType == Type.tError) {
+		// Don't propagate type errors.
+		return;
+	    }
+	    GlobalOptions.err.println("updateParentType: Type error in "
+				      +this+": merging "+getType()
+				      +" and "+otherType);
+	    if ((GlobalOptions.debuggingFlags
+		 & GlobalOptions.DEBUG_TYPES) != 0)
+		Thread.dumpStack();
+	}
+	type = newType;
+	if (parent != null)
+	    parent.updateType();
+    }
+
+    /**
+     * Tells an expression that an inner expression may have changed and
+     * that the type should be recalculated.
+     * 
+     * This may call setType of the caller again.
+     */
+    public abstract void updateType();
+
+    /**
+     * Tells an expression that an outer expression has changed our type
+     * and that the inner types should be recalculated.
+     */
+    public abstract void updateSubTypes();
+
     public Type getType() {
         return type;
     }
 
-    public Expression getParent() {
+    public Operator getParent() {
         return parent;
     }
 
-    public void setType(Type otherType) {
-	Type newType = type.intersection(otherType);
-	if (newType == Type.tError 
-	    && type != Type.tError && otherType != Type.tError)
-	    GlobalOptions.err.println("Type error in "+this+": "
-				   +"merging "+type+" and "+otherType);
-	type = newType;
-    }
 
-    public void updateType() {
-        if (parent != null)
-            parent.updateType();
-    }
+    /**
+     * Get priority of the operator.
+     * Currently this priorities are known:
+     * <ul><li> 1000 constant
+     * </li><li> 950 new, .(field access), []
+     * </li><li> 900 new[]
+     * </li><li> 800 ++,-- (post)
+     * </li><li> 700 ++,--(pre), +,-(unary), ~, !, cast
+     * </li><li> 650 *,/, % 
+     * </li><li> 610 +,-
+     * </li><li> 600 <<, >>, >>> 
+     * </li><li> 550 >, <, >=, <=, instanceof
+     * </li><li> 500 ==, != 
+     * </li><li> 450 & 
+     * </li><li> 420 ^ 
+     * </li><li> 410 | 
+     * </li><li> 350 && 
+     * </li><li> 310 || 
+     * </li><li> 200 ?:
+     * </li><li> 100 =, +=, -=, etc.
+     * </li></ul>
+     */
+    public abstract int getPriority();
 
     /**
      * Get the number of operands.
      * @return The number of stack entries this expression needs.
      */
-    public abstract int getOperandCount();
+    public abstract int getFreeOperandCount();
 
     public abstract Expression addOperand(Expression op);
 
     public Expression negate() {
         Operator negop = 
             new UnaryOperator(Type.tBoolean, Operator.LOG_NOT_OP);
-        return new ComplexExpression(negop, new Expression[] { this });
+	negop.addOperand(this);
+	return negop;
     }
 
     /**
@@ -74,7 +141,6 @@ public abstract class Expression {
      * @param expr the expression that should not change.
      */
     public boolean hasSideEffects(Expression expr) {
-	// Most expression don't have side effects.
 	return false;
     }
 
@@ -85,21 +151,20 @@ public abstract class Expression {
      * @return 1, if it can, 0, if no match was found and -1, if a
      * conflict was found.  You may wish to check for >0.
      */
-    public int canCombine(Expression e) {
-// 	jode.GlobalOptions.err.println("Try to combine "+e+" into "+this);
-        return containsMatchingLoad(e)? 1 : 0;
+    public int canCombine(CombineableOperator combOp) {
+	return 0;
     }
 
     /**
      * Checks if this expression contains a load, that matches the
-     * given Expression (which should be a StoreInstruction/IIncOperator).
+     * given CombineableOperator (which must be an Operator)
      * @param e The store expression.
      * @return if this expression contains a matching load.
      * @exception ClassCastException, if e.getOperator 
      * is not a CombineableOperator.
      */
-    public boolean containsMatchingLoad(Expression e) {
-        return ((CombineableOperator)e.getOperator()).matches(getOperator());
+    public boolean containsMatchingLoad(CombineableOperator e) {
+	return false;
     }
 
     /**
@@ -109,7 +174,7 @@ public abstract class Expression {
      * @param op The combineable operator.
      * @return if this expression contains a matching load.  */
     public boolean containsConflictingLoad(MatchableOperator op) {
-        return op.matches(getOperator());
+        return false;
     }
 
     /**
@@ -122,14 +187,7 @@ public abstract class Expression {
      * @exception ClassCastException, if e.getOperator 
      * is not a CombineableOperator.
      */
-    public Expression combine(Expression e) {
-	CombineableOperator op = (CombineableOperator) e.getOperator();
-	if (op.matches(getOperator())) {
-	    op.makeNonVoid();
-	    /* Do not call setType, we don't want to intersect. */
-	    e.type = e.getOperator().getType();
-	    return e;
-        }
+    public Expression combine(CombineableOperator comb) {
         return null;
     }
 
@@ -158,8 +216,6 @@ public abstract class Expression {
         return null;
     }
 
-    public abstract Operator getOperator();
-
     public void makeInitializer() {
     }
 
@@ -167,24 +223,33 @@ public abstract class Expression {
         return true;
     }
 
+    public void fillInGenSet(VariableSet in, VariableSet gen) {
+    }
+
     public abstract void dumpExpression(TabbedPrintWriter writer) 
 	throws java.io.IOException;
 
     public void dumpExpression(TabbedPrintWriter writer, int minPriority)
 	throws java.io.IOException {
 	boolean needParen1 = false, needParen2 = false;
-	if ((GlobalOptions.debuggingFlags & GlobalOptions.DEBUG_TYPES) != 0) {
+	if (type == Type.tError) {
+	    if (minPriority > 700) {
+		needParen1 = true;
+		writer.print("(");
+	    }
+	    writer.print("/*TYPE ERROR*/ ");
+	    minPriority = 700;
+	}
+	else if ((GlobalOptions.debuggingFlags
+		  & GlobalOptions.DEBUG_TYPES) != 0) {
 	    if (minPriority > 700) {
 		needParen1 = true;
 		writer.print("(");
 	    }
-	    writer.print("("+getType()+") ");
+	    writer.print("(TYPE "+type+") ");
 	    minPriority = 700;
-	} else if (getType() == Type.tError) {
-	    writer.print("(/*type error */");
-	    needParen1 = true;
 	}
-	if (getOperator().getPriority() < minPriority) {
+	if (getPriority() < minPriority) {
 	    needParen2 = true;
 	    writer.print("(");
 	}
@@ -208,7 +273,6 @@ public abstract class Expression {
         }
     }	
 
-
     public boolean isVoid() {
         return getType() == Type.tVoid;
     }

jode/jode/expr/GetFieldOperator.java

@@ -35,7 +35,6 @@ public class GetFieldOperator extends Operator {
     CodeAnalyzer codeAnalyzer;
     Reference ref;
     Type classType;
-    boolean needCast = false;
 
     public GetFieldOperator(CodeAnalyzer codeAnalyzer, boolean staticFlag,
 			    Reference ref) {
@@ -46,27 +45,18 @@ public class GetFieldOperator extends Operator {
 	this.ref = ref;
         if (staticFlag)
             codeAnalyzer.useType(classType);
+	initOperands(staticFlag ? 0 : 1);
     }
 
     public int getPriority() {
         return 950;
     }
 
-    public int getOperandCount() {
-        return staticFlag?0:1;
-    }
-
-    public int getOperandPriority(int i) {
-        return 900;
-    }
-
-    public Type getOperandType(int i) {
-        return classType;
-    }
-
-    public void setOperandType(Type types[]) {
+    public void updateSubTypes() {
 	if (!staticFlag)
-	    needCast = types[0].getHint().equals(Type.tNull);
+	    subExpressions[0].setType(Type.tSubType(classType));
+    }
+    public void updateType() {
     }
 
     /**
@@ -98,7 +88,7 @@ public class GetFieldOperator extends Operator {
 	return null;
     }
 
-    public FieldAnalyzer getFieldAnalyzer() {
+    public FieldAnalyzer getField() {
 	ClassInfo clazz = getClassInfo();
 	if (clazz != null) {
 	    ClassAnalyzer ana = codeAnalyzer.getClassAnalyzer();
@@ -119,9 +109,10 @@ public class GetFieldOperator extends Operator {
 	return null;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	boolean opIsThis = !staticFlag && operands[0] instanceof ThisOperator;
+	boolean opIsThis = !staticFlag
+	    && subExpressions[0] instanceof ThisOperator;
 	String fieldName = ref.getName();
 	if (staticFlag) {
 	    if (!classType.equals(Type.tClass(codeAnalyzer.getClazz()))
@@ -130,48 +121,56 @@ public class GetFieldOperator extends Operator {
 		writer.print(".");
 	    }
 	    writer.print(fieldName);
-	} else if (operands[0].getType() instanceof NullType) {
+	} else if (subExpressions[0].getType() instanceof NullType) {
 	    writer.print("((");
 	    writer.printType(classType);
 	    writer.print(")");
-	    operands[0].dumpExpression(writer, 700);
+	    subExpressions[0].dumpExpression(writer, 700);
 	    writer.print(").");
 	    writer.print(fieldName);
 	} else {
 	    if (opIsThis) {
-		ThisOperator thisOp = (ThisOperator) operands[0];
+		ThisOperator thisOp = (ThisOperator) subExpressions[0];
 		Scope scope = writer.getScope(thisOp.getClassInfo(),
 					      Scope.CLASSSCOPE);
 
-		if (scope == null)
-		    writer.println("UNKNOWN ");
-
 		if (scope == null || writer.conflicts(fieldName, scope, 
 						      Scope.FIELDNAME)) {
 		    thisOp.dumpExpression(writer, 950);
 		    writer.print(".");
 		} else if (writer.conflicts(fieldName, scope, 
-					    Scope.AMBIGUOUSNAME)) {
+					    Scope.AMBIGUOUSNAME)
+			   || (/* This is a inherited field conflicting
+				* with a field name in some outer class.
+				*/
+			       getField() == null 
+			       && writer.conflicts(fieldName, null,
+						   Scope.FIELDNAME))) {
 		    writer.print("this.");
 		}
 	    } else {
-		operands[0].dumpExpression(writer, 950);
+		subExpressions[0].dumpExpression(writer, 950);
 		writer.print(".");
 	    }
 	    writer.print(fieldName);
 	}
     }
 
-    public Expression simplifyThis(Expression[] subs) {
-	if (!staticFlag && subs[0] instanceof ThisOperator) {
-	    Expression constant = getFieldAnalyzer().getConstant();
-	    if (constant instanceof ThisOperator)
-		return constant;
+    public Expression simplify() {
+	if (!staticFlag) {
+	    subExpressions[0] = subExpressions[0].simplify();
+	    subExpressions[0].parent = this;
+	    if (subExpressions[0] instanceof ThisOperator
+		&& getField() != null) {
+		Expression constant = getField().getConstant();
+		if (constant instanceof ThisOperator)
+		    return constant;
+	    }
 	}
-	return null;
+	return this;
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
 	return o instanceof GetFieldOperator
 	    && ((GetFieldOperator)o).ref.equals(ref);
     }

jode/jode/expr/IIncOperator.java

@@ -22,53 +22,38 @@ import jode.type.Type;
 import jode.decompiler.LocalInfo;
 import jode.decompiler.TabbedPrintWriter;
 
-public class IIncOperator extends NoArgOperator 
-    implements LocalVarOperator, CombineableOperator {
-    String value;
-    LocalInfo local;
+public class IIncOperator extends Operator 
+    implements CombineableOperator {
+    int value;
 
-    public IIncOperator(LocalInfo local, String value, int operator) {
+    public IIncOperator(LocalStoreOperator localStore, int value, 
+			int operator) {
         super(Type.tVoid, operator);
-        this.local = local;
 	this.value = value;
-        local.setType(Type.tUInt);
-        local.setOperator(this);
+	initOperands(1);
+	setSubExpressions(0, localStore);
     }
 
-    public String getValue() {
-	return value;
-    }
-
-    public boolean isRead() {
-        return true;
-    }
-
-    public boolean isWrite() {
-        return true;
-    }
-
-    public void updateType() {
-        if (parent != null)
-            parent.updateType();
+    public LValueExpression getLValue() {
+	return (LValueExpression) subExpressions[0];
     }
 
-    public LocalInfo getLocalInfo() {
-	return local;
+    public String getValue() {
+	return Integer.toString(value);
     }
 
     public int getPriority() {
         return 100;
     }
 
+    public void updateSubTypes() {
+	subExpressions[0].setType(type != Type.tVoid ? type : Type.tUInt);
+    }
 
-    /**
-     * Checks if the value of the given expression can change, due to
-     * side effects in this expression.  If this returns false, the 
-     * expression can safely be moved behind the current expresion.
-     * @param expr the expression that should not change.
-     */
-    public boolean hasSideEffects(Expression expr) {
-	return expr.containsConflictingLoad(this);
+
+    public void updateType() {
+	if (type != Type.tVoid)
+	    updateParentType(subExpressions[0].getType());
     }
 
     /**
@@ -77,29 +62,27 @@ public class IIncOperator extends NoArgOperator
     public void makeNonVoid() {
         if (type != Type.tVoid)
             throw new jode.AssertError("already non void");
-        type = local.getType();
+        type = subExpressions[0].getType();
     }
 
-    public boolean matches(Operator loadop) {
-        return loadop instanceof LocalLoadOperator && 
-            ((LocalLoadOperator)loadop).getLocalInfo().getLocalInfo()
-            == local.getLocalInfo();
+    public boolean lvalueMatches(Operator loadop) {
+	return getLValue().matches(loadop);
     }
 
     public Expression simplify() {
-        if (value.equals("1")) {
+        if (value == 1) {
             int op = (getOperatorIndex() == OPASSIGN_OP+ADD_OP)
                 ? INC_OP : DEC_OP;
-
-            return new LocalPrePostFixOperator
-                (getType(), op, this, isVoid()).simplify();
+            return new PrePostFixOperator
+                (getType(), op, getLValue(), isVoid()).simplify();
         }
         return super.simplify();
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	writer.print(local.getName() + getOperatorString() + value);
+	subExpressions[0].dumpExpression(writer, 950);
+	writer.print(getOperatorString() + value);
     }
 }
+

jode/jode/expr/IfThenElseOperator.java

@@ -19,52 +19,91 @@
 
 package jode.expr;
 import jode.type.Type;
+import jode.decompiler.FieldAnalyzer;
 import jode.decompiler.TabbedPrintWriter;
 
-public class IfThenElseOperator extends SimpleOperator {
+public class IfThenElseOperator extends Operator {
     public IfThenElseOperator(Type type) {
-        super(type, 0, 3);
-        operandTypes[0] = Type.tBoolean;
+        super(type, 0);
+	initOperands(3);
     }
     
-    public int getOperandCount() {
-        return 3;
-    }
-
     public int getPriority() {
         return 200;
     }
 
-    public void setOperandType(Type[] inputTypes) {
-        super.setOperandType(inputTypes);
-        Type operandType = 
-            type.intersection(operandTypes[1]).intersection(operandTypes[2]);
-        type = operandTypes[1] = operandTypes[2] = operandType;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tBoolean);
+	subExpressions[1].setType(Type.tSubType(type));
+	subExpressions[2].setType(Type.tSubType(type));
+    }
+
+    public void updateType() {
+	Type subType = Type.tSuperType(subExpressions[1].getType())
+	    .intersection(Type.tSuperType(subExpressions[2].getType()));
+	updateParentType(subType);
     }
 
-    /**
-     * Sets the return type of this operator.
-     * @return true if the operand types changed
-     */
-    public void setType(Type newType) {
-        Type operandType = 
-            type.intersection(operandTypes[1]).intersection(newType);
-        if (!type.equals(operandType)) {
-            type = operandTypes[1] = operandTypes[2] = operandType;
+    public Expression simplify() {
+	if (getType().isOfType(Type.tBoolean)) {
+            if (subExpressions[1] instanceof ConstOperator
+		&& subExpressions[2] instanceof ConstOperator) {
+                ConstOperator c1 = (ConstOperator) subExpressions[1];
+                ConstOperator c2 = (ConstOperator) subExpressions[2];
+                if (c1.getValue().equals("1") &&
+                    c2.getValue().equals("0"))
+                    return subExpressions[0].simplify();
+                if (c2.getValue().equals("1") &&
+                    c1.getValue().equals("0"))
+                    return subExpressions[0].negate().simplify();
+            }
         }
+	if (subExpressions[0] instanceof CompareUnaryOperator
+	    && (subExpressions[1] instanceof GetFieldOperator)
+	    && (subExpressions[2] instanceof StoreInstruction)) {
+	    // Check for
+	    //   class$classname != null ? class$classname :
+	    //       (class$classname = class$("classname"))
+	    // and replace with
+	    //   classname.class
+	    CompareUnaryOperator cmp 
+		= (CompareUnaryOperator) subExpressions[0];
+	    GetFieldOperator get = (GetFieldOperator) subExpressions[1];
+	    StoreInstruction put = (StoreInstruction) subExpressions[2];
+	    FieldAnalyzer field;
+	    if (cmp.getOperatorIndex() == Operator.NOTEQUALS_OP
+		&& put.getLValue() instanceof PutFieldOperator
+		&& ((field = ((PutFieldOperator)put.getLValue()).getField())
+		    != null) && field.isSynthetic() 
+		&& put.lvalueMatches(get)
+		&& cmp.subExpressions[0] instanceof GetFieldOperator
+		&& put.lvalueMatches((GetFieldOperator)cmp.subExpressions[0])
+		&& put.subExpressions[1] instanceof InvokeOperator) {
+		InvokeOperator invoke = (InvokeOperator) put.subExpressions[1];
+		if (invoke.isGetClass()
+		    && invoke.subExpressions[0] instanceof ConstOperator
+		    && (invoke.subExpressions[0].getType()
+			.equals(Type.tString))) {
+		    String clazz = 
+			((ConstOperator)invoke.subExpressions[0]).getValue();
+		    if (field.setClassConstant(clazz))
+			return new ClassFieldOperator(Type.tClass(clazz));
+		}
+	    }
+	}
+	return super.simplify();
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
 	return (o instanceof IfThenElseOperator);
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, 201);
+	subExpressions[0].dumpExpression(writer, 201);
 	writer.print(" ? ");
-	operands[1].dumpExpression(writer, 0);
+	subExpressions[1].dumpExpression(writer, 0);
 	writer.print(" : ");
-	operands[2].dumpExpression(writer, 200);
+	subExpressions[2].dumpExpression(writer, 200);
     }
 }

jode/jode/expr/InstanceOfOperator.java

@@ -21,50 +21,42 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class InstanceOfOperator extends SimpleOperator {
+public class InstanceOfOperator extends Operator {
 
-    Type instanceType;
-    /**
-     * There are special cases where a instanceof isn't allowed.  We must cast
-     * to the common super type before.  This cases always give a runtime
-     * error, but we want to decompile even bad programs.
-     */
-    Type superType = null;
-    
+    Type instanceType;    
 
     public InstanceOfOperator(Type type) {
-        super(Type.tBoolean, 0, 1);
+        super(Type.tBoolean, 0);
         this.instanceType = type;
-        this.operandTypes[0] = Type.tUnknown;
-    }
-    public int getOperandCount() {
-        return 1;
+	initOperands(1);
     }
 
     public int getPriority() {
         return 550;
     }
 
-    public void setOperandType(Type[] type) {
-	super.setOperandType(type);
-	superType = instanceType.getCastHelper(type[0]);
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tUObject);
+    }
+
+    public void updateType() {
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	/* There are special cases where a cast isn't allowed.  We must cast
 	 * to the common super type before.  This cases always give a runtime
 	 * error, but we want to decompile even bad programs.
 	 */
-	Type superType = instanceType.getCastHelper(operands[0].getType());
+	Type superType
+	    = instanceType.getCastHelper(subExpressions[0].getType());
 	if (superType != null) {
 	    writer.print("(");
 	    writer.printType(superType);
 	    writer.print(") ");
-	    operands[0].dumpExpression(writer, 700);
+	    subExpressions[0].dumpExpression(writer, 700);
 	} else
-	    operands[0].dumpExpression(writer, 550);
+	    subExpressions[0].dumpExpression(writer, 550);
         writer.print(" instanceof ");
 	writer.printType(instanceType);
     }

jode/jode/expr/InvokeOperator.java

@@ -18,6 +18,8 @@
  */
 
 package jode.expr;
+import java.lang.reflect.Modifier;
+
 import jode.Decompiler;
 import jode.decompiler.CodeAnalyzer;
 import jode.decompiler.MethodAnalyzer;
@@ -43,7 +45,7 @@ public final class InvokeOperator extends Operator
 			  boolean staticFlag, boolean specialFlag, 
 			  Reference reference) {
         super(Type.tUnknown, 0);
-        this.methodType = (MethodType) Type.tType(reference.getType());
+        this.methodType = Type.tMethod(reference.getType());
         this.methodName = reference.getName();
         this.classType = Type.tType(reference.getClazz());
         this.type = methodType.getReturnType();
@@ -52,25 +54,8 @@ public final class InvokeOperator extends Operator
         this.specialFlag = specialFlag;
         if (staticFlag)
             codeAnalyzer.useType(classType);
-    }
-
-    /**
-     * Checks if the value of the given expression can change, due to
-     * side effects in this expression.  If this returns false, the 
-     * expression can safely be moved behind the current expresion.
-     * @param expr the expression that should not change.
-     */
-    public boolean hasSideEffects(Expression expr) {
-	return expr.containsConflictingLoad(this);
-    }
-
-    /**
-     * Checks if the value of the operator can be changed by this expression.
-     */
-    public boolean matches(Operator loadop) {
-        return (loadop instanceof InvokeOperator
-		|| loadop instanceof ConstructorOperator
-		|| loadop instanceof GetFieldOperator);
+	initOperands((staticFlag ? 0 : 1) 
+		     + methodType.getParameterTypes().length);
     }
 
     public final boolean isStatic() {
@@ -93,21 +78,16 @@ public final class InvokeOperator extends Operator
         return 950;
     }
 
-    public int getOperandCount() {
-        return (isStatic()?0:1) 
-            + methodType.getParameterTypes().length;
-    }
-
-    public Type getOperandType(int i) {
+    public void updateSubTypes() {
+	int offset = 0;
         if (!isStatic()) {
-            if (i == 0)
-                return getClassType();
-            i--;
+	    subExpressions[offset++].setType(Type.tSubType(getClassType()));
         }
-        return methodType.getParameterTypes()[i];
+	Type[] paramTypes = methodType.getParameterTypes();
+	for (int i=0; i < paramTypes.length; i++)
+	    subExpressions[offset++].setType(Type.tSubType(paramTypes[i]));
     }
-
-    public void setOperandType(Type types[]) {
+    public void updateType() {
     }
 
     public boolean isConstructor() {
@@ -129,13 +109,12 @@ public final class InvokeOperator extends Operator
 	return getClassInfo() == codeAnalyzer.getClazz();
     }
 
-    public ClassInfo getOuterClass() {
+    public InnerClassInfo getOuterClassInfo() {
 	ClassInfo clazz = getClassInfo();
 	if (clazz != null) {
 	    InnerClassInfo[] outers = clazz.getOuterClasses();
-	    if (outers != null && outers[0].outer != null
-		&& (Decompiler.options & Decompiler.OPTION_INNER) != 0)
-		return ClassInfo.forName(outers[0].outer);
+	    if (outers != null)
+		return outers[0];
 	}
 	return null;
     }
@@ -202,90 +181,13 @@ public final class InvokeOperator extends Operator
 	return false;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands) 
-	throws java.io.IOException {
-	boolean opIsThis = !staticFlag && operands[0] instanceof ThisOperator;
-        int arg = 1;
-
-	if (isConstructor()) {
-	    ClassInfo outer = getOuterClass();
-	    if (outer != null) {
-		operands[arg++].dumpExpression(writer, 0);
-		writer.print(".");
-	    }
-	}
-	if (specialFlag) {
-	    if (opIsThis
-		&& (((ThisOperator)operands[0]).getClassInfo()
-		    == codeAnalyzer.getClazz())) {
-		if (isThis()) {
-		    /* XXX check if this is a private or final method. */
-		} else {
-		    /* XXX check that this is the first defined
-		     * super method. */
-		    writer.print("super");
-		    opIsThis = false;
-		}
-	    } else {
-		/* XXX check if this is a private or final method. */
-		int minPriority = 950; /* field access */
-		if (!isThis()) {
-		    writer.print("(NON VIRTUAL ");
-		    writer.printType(classType);
-		    writer.print(")");
-		    minPriority = 700;
-		}
-		operands[0].dumpExpression(writer, minPriority);
-	    }
-	} else if (staticFlag) {
-	    arg = 0;
-	    Scope scope = writer.getScope(getClassInfo(),
-					  Scope.CLASSSCOPE);
-	    if (scope != null
-		&& !writer.conflicts(methodName, scope, Scope.METHODNAME))
-		opIsThis = true;
-	    else
-		writer.printType(classType);
-	} else {
-	    if (opIsThis) {
-		ThisOperator thisOp = (ThisOperator) operands[0];
-		Scope scope = writer.getScope(thisOp.getClassInfo(),
-					      Scope.CLASSSCOPE);
-		if (writer.conflicts(methodName, scope, Scope.METHODNAME)) {
-		    thisOp.dumpExpression(writer, 950);
-		    writer.print(".");
-		}
-	    } else {
-		if (operands[0].getType() instanceof NullType) {
-		    writer.print("((");
-		    writer.printType(classType);
-		    writer.print(") ");
-		    operands[0].dumpExpression(writer, 700);
-		    writer.print(")");
-		} else 
-		    operands[0].dumpExpression(writer, 950);
-	    }
-	}
-
-	if (isConstructor()) {
-	    if (opIsThis)
-		writer.print("this");
-	} else {
-	    if (!opIsThis)
-		writer.print(".");
-	    writer.print(methodName);
-	}
-	writer.print("(");
-	boolean first = true;
-	while (arg < operands.length) {
-            if (!first)
-		writer.print(", ");
-	    else
-		first = false;
-            operands[arg++].dumpExpression(writer, 0);
-        }
-        writer.print(")");
+    /**
+     * Checks if the value of the operator can be changed by this expression.
+     */
+    public boolean matches(Operator loadop) {
+        return (loadop instanceof InvokeOperator
+		|| loadop instanceof ConstructorOperator
+		|| loadop instanceof GetFieldOperator);
     }
 
     /**
@@ -329,11 +231,6 @@ public final class InvokeOperator extends Operator
     }
 
     public ConstOperator deobfuscateString(ConstOperator op) {
-	if (!isThis() || !isStatic()
-	    || methodType.getParameterTypes().length != 1
-	    || !methodType.getParameterTypes()[0].equals(Type.tString)
-	    || !methodType.getReturnType().equals(Type.tString))
-	    return null;
 	ClassAnalyzer clazz = codeAnalyzer.getClassAnalyzer();
 	CodeAnalyzer ca = clazz.getMethod(methodName, methodType).getCode();
 	if (ca == null)
@@ -361,8 +258,89 @@ public final class InvokeOperator extends Operator
 	return new ConstOperator(result);
     }
 
-    public Expression simplifyAccess(Expression[] subs) {
-	if (isOuter()) {
+    public Expression simplifyStringBuffer() {
+        if (getClassType().equals(Type.tStringBuffer)
+            && !isStatic() 
+            && getMethodName().equals("append")
+            && getMethodType().getParameterTypes().length == 1) {
+
+            Expression e = subExpressions[0].simplifyStringBuffer();
+            if (e == null)
+                return null;
+            
+	    subExpressions[1] = subExpressions[1].simplifyString();
+
+            if (e == EMPTYSTRING
+		&& subExpressions[1].getType().isOfType(Type.tString))
+                return subExpressions[1];
+	    
+	    if (e instanceof StringAddOperator
+		&& ((Operator)e).getSubExpressions()[0] == EMPTYSTRING)
+		e = ((Operator)e).getSubExpressions()[1];
+
+	    Operator result = new StringAddOperator();
+	    result.addOperand(subExpressions[1]);
+	    result.addOperand(e);
+	    return result;
+        }
+        return null;
+    }
+
+    public Expression simplifyString() {
+	if (getMethodName().equals("toString")
+	    && !isStatic()
+	    && getClassType().equals(Type.tStringBuffer)
+	    && subExpressions.length == 1) {
+	    Expression simple = subExpressions[0].simplifyStringBuffer();
+	    if (simple != null)
+		return simple;
+	}
+	else if (getMethodName().equals("valueOf")
+		 && isStatic() 
+		 && getClassType().equals(Type.tString)
+		 && subExpressions.length == 1) {
+	    
+	    if (subExpressions[0].getType().isOfType(Type.tString))
+		return subExpressions[0];
+	    
+	    Operator op = new StringAddOperator();
+	    op.addOperand(subExpressions[0]);
+	    op.addOperand(EMPTYSTRING);
+	}
+	/* The pizza way (pizza is the compiler of kaffe) */
+	else if (getMethodName().equals("concat")
+		 && !isStatic()
+		 && getClassType().equals(Type.tString)) {
+	    
+	    Expression result = new StringAddOperator();
+	    Expression right = subExpressions[1].simplify();
+	    if (right instanceof StringAddOperator) {
+		Operator op = (Operator) right;
+		if (op.subExpressions != null
+		    && op.subExpressions[0] == EMPTYSTRING)
+		    right = op.subExpressions[1];
+	    }
+	    result.addOperand(right);
+	    result.addOperand(subExpressions[0].simplify());
+	} 
+	else if ((Decompiler.options & Decompiler.OPTION_DECRYPT) != 0
+		 && isThis() && isStatic()
+		 && methodType.getParameterTypes().length == 1
+		 && methodType.getParameterTypes()[0].equals(Type.tString)
+		 && methodType.getReturnType().equals(Type.tString)) {
+
+	    Expression expr = subExpressions[0].simplifyString();
+	    if (expr instanceof ConstOperator) {
+		expr = deobfuscateString((ConstOperator)expr);
+		if (expr != null)
+		    return expr;
+	    }
+	}
+        return this;
+    }
+
+    public Expression simplifyAccess() {
+	if (isOuter() && getMethodAnalyzer() != null) {
 	    SyntheticAnalyzer synth = getMethodAnalyzer().getSynthetic();
 	    if (synth != null) {
 		Operator op = null;
@@ -376,12 +354,14 @@ public final class InvokeOperator extends Operator
 					      synth.getReference());
 		    break;
 		case SyntheticAnalyzer.ACCESSPUTFIELD:
-		    op = new PutFieldOperator(codeAnalyzer, false,
-					      synth.getReference());
+		    op = new StoreInstruction
+			(new PutFieldOperator(codeAnalyzer, false,
+					      synth.getReference()));
 		    break;
 		case SyntheticAnalyzer.ACCESSPUTSTATIC:
-		    op = new PutFieldOperator(codeAnalyzer, true,
-					      synth.getReference());
+		    op = new StoreInstruction
+			(new PutFieldOperator(codeAnalyzer, true,
+					      synth.getReference()));
 		    break;
 		case SyntheticAnalyzer.ACCESSMETHOD:
 		    op = new InvokeOperator(codeAnalyzer, false, 
@@ -394,9 +374,11 @@ public final class InvokeOperator extends Operator
 		}
 
 		if (op != null) {
-		    if (subs == null)
-			return op;
-		    return new ComplexExpression(op, subs);
+		    if (subExpressions != null) {
+			for (int i=subExpressions.length; i-- > 0; )
+			    op.addOperand(subExpressions[i]);
+		    }
+		    return op;
 		}
 	    }
 	}
@@ -404,9 +386,12 @@ public final class InvokeOperator extends Operator
     }
 
     public Expression simplify() {
-	Expression expr = simplifyAccess(null);
+	Expression expr = simplifyAccess();
 	if (expr != null)
 	    return expr.simplify();
+	expr = simplifyString();
+	if (expr != this)
+	    return expr.simplify();
 	return super.simplify();
     }
 
@@ -414,4 +399,102 @@ public final class InvokeOperator extends Operator
     /* Invokes never equals: they may return different values even if
      * they have the same parameters.
      */
+
+    public void dumpExpression(TabbedPrintWriter writer)
+	throws java.io.IOException {
+	boolean opIsThis = !staticFlag
+	    && subExpressions[0] instanceof ThisOperator;
+        int arg = 1;
+
+	if (isConstructor()) {
+	    InnerClassInfo outer = getOuterClassInfo();
+	    if (outer != null && outer.outer != null
+		&& !Modifier.isStatic(outer.modifiers)
+		&& (Decompiler.options & Decompiler.OPTION_INNER) != 0) {
+		Expression outerInstance = subExpressions[arg++];
+		if (!(outerInstance instanceof ThisOperator)) {
+		    outerInstance.dumpExpression(writer, 0);
+		    writer.print(".");
+		}
+	    }
+	}
+	if (specialFlag) {
+	    if (opIsThis
+		&& (((ThisOperator)subExpressions[0]).getClassInfo()
+		    == codeAnalyzer.getClazz())) {
+		if (isThis()) {
+		    /* XXX check if this is a private or final method. */
+		} else {
+		    /* XXX check that this is the first defined
+		     * super method. */
+		    writer.print("super");
+		    opIsThis = false;
+		}
+	    } else {
+		/* XXX check if this is a private or final method. */
+		int minPriority = 950; /* field access */
+		if (!isThis()) {
+		    writer.print("(NON VIRTUAL ");
+		    writer.printType(classType);
+		    writer.print(")");
+		    minPriority = 700;
+		}
+		subExpressions[0].dumpExpression(writer, minPriority);
+	    }
+	} else if (staticFlag) {
+	    arg = 0;
+	    Scope scope = writer.getScope(getClassInfo(),
+					  Scope.CLASSSCOPE);
+	    if (scope != null
+		&& !writer.conflicts(methodName, scope, Scope.METHODNAME))
+		opIsThis = true;
+	    else
+		writer.printType(classType);
+	} else {
+	    if (opIsThis) {
+		ThisOperator thisOp = (ThisOperator) subExpressions[0];
+		Scope scope = writer.getScope(thisOp.getClassInfo(),
+					      Scope.CLASSSCOPE);
+		if (writer.conflicts(methodName, scope, Scope.METHODNAME)) {
+		    thisOp.dumpExpression(writer, 950);
+		    writer.print(".");
+		} else if (/* This is a inherited field conflicting
+			    * with a field name in some outer class.
+			    */
+			   getMethodAnalyzer() == null 
+			   && writer.conflicts(methodName, null,
+					       Scope.METHODNAME)) {
+		    writer.print("this.");
+		}
+	    } else {
+		if (subExpressions[0].getType() instanceof NullType) {
+		    writer.print("((");
+		    writer.printType(classType);
+		    writer.print(") ");
+		    subExpressions[0].dumpExpression(writer, 700);
+		    writer.print(")");
+		} else 
+		    subExpressions[0].dumpExpression(writer, 950);
+	    }
+	}
+
+	if (isConstructor()) {
+	    if (opIsThis)
+		writer.print("this");
+	} else {
+	    if (!opIsThis)
+		writer.print(".");
+	    writer.print(methodName);
+	}
+	writer.print("(");
+	boolean first = true;
+	while (arg < subExpressions.length) {
+            if (!first)
+		writer.print(", ");
+	    else
+		first = false;
+            subExpressions[arg++].dumpExpression(writer, 0);
+        }
+        writer.print(")");
+    }
 }

jode/jode/expr/LValueExpression.java

@@ -0,0 +1,31 @@
+/* LValueExpression Copyright (C) 1999 Jochen Hoenicke.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ */
+
+package jode.expr;
+import jode.type.Type;
+import jode.GlobalOptions;
+import jode.decompiler.TabbedPrintWriter;
+
+public abstract class LValueExpression extends Operator 
+    implements MatchableOperator {
+
+    public LValueExpression(Type lvalueType) {
+	super(lvalueType, 0);
+    }
+}

jode/jode/expr/LocalLoadOperator.java

@@ -25,7 +25,7 @@ import jode.decompiler.ClassAnalyzer;
 import jode.decompiler.LocalInfo;
 import jode.decompiler.TabbedPrintWriter;
 
-public class LocalLoadOperator extends NoArgOperator
+public class LocalLoadOperator extends Operator
     implements LocalVarOperator {
     CodeAnalyzer codeAnalyzer;
     LocalInfo local;
@@ -35,8 +35,8 @@ public class LocalLoadOperator extends NoArgOperator
         super(type);
 	this.codeAnalyzer = codeAnalyzer;
         this.local = local;
-        local.setType(type);
         local.setOperator(this);
+	initOperands(0);
     }
 
     public boolean isRead() {
@@ -51,43 +51,30 @@ public class LocalLoadOperator extends NoArgOperator
         return false;
     }
 
+    public int getPriority() {
+        return 1000;
+    }
+
     public LocalInfo getLocalInfo() {
 	return local.getLocalInfo();
     }
 
+    public void updateSubTypes() {
+        if ((GlobalOptions.debuggingFlags & GlobalOptions.DEBUG_TYPES) != 0)
+	    GlobalOptions.err.println("setType of "+local.getName()+": "
+				      +local.getType());
+	local.setType(type);
+    }
+
     public void updateType() {
         if ((GlobalOptions.debuggingFlags & GlobalOptions.DEBUG_TYPES) != 0)
             GlobalOptions.err.println("local "+local.getName()+" changed: "
                                +type+" to "+local.getType()
                                +" in "+parent);
-        super.setType(local.getType());
-        if (parent != null)
-            parent.updateType();
+	updateParentType(local.getType());
     }
 
-    public int getPriority() {
-        return 1000;
-    }
-
-    public Type getType() {
-//  	GlobalOptions.err.println("LocalLoad.getType of "+local.getName()+": "+local.getType());
-	return local.getType();
-    }
-
-    public void setType(Type type) {
-// 	GlobalOptions.err.println("LocalLoad.setType of "+local.getName()+": "+local.getType());
-	super.setType(local.setType(type));
-    }
-
-//     public int getSlot() {
-//         return slot;
-//     }
-
-    public String toString() {
-        return local.getName().toString();
-    }
-
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
         return (o instanceof LocalLoadOperator &&
                 ((LocalLoadOperator) o).local.getSlot() == local.getSlot());
     }
@@ -102,10 +89,8 @@ public class LocalLoadOperator extends NoArgOperator
 	return super.simplify();
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	writer.print(toString());
+	writer.print(local.getName());
     }
 }
-

jode/jode/expr/LocalStoreOperator.java

@@ -22,72 +22,48 @@ import jode.type.Type;
 import jode.decompiler.LocalInfo;
 import jode.decompiler.TabbedPrintWriter;
 
-public class LocalStoreOperator extends StoreInstruction 
+public class LocalStoreOperator extends LValueExpression 
     implements LocalVarOperator {
     LocalInfo local;
 
-    public LocalStoreOperator(Type lvalueType, LocalInfo local, int operator) {
-        super(lvalueType, operator);
+    public LocalStoreOperator(Type lvalueType, LocalInfo local) {
+        super(lvalueType);
         this.local = local;
-        local.setType(lvalueType);
         local.setOperator(this);
+	initOperands(0);
     }
 
     public boolean isRead() {
-        return operator != ASSIGN_OP;
+        return parent != null && parent.getOperatorIndex() != ASSIGN_OP;
     }
 
     public boolean isWrite() {
         return true;
     }
 
+    public void updateSubTypes() {
+        local.setType(type);
+    }
+
     public void updateType() {
-        if (parent != null)
-            parent.updateType();
+	updateParentType(local.getType());
     }
 
     public LocalInfo getLocalInfo() {
 	return local.getLocalInfo();
     }
 
-    public Type getLValueType() {
-	return local.getType();
-    }
-
-    public void setLValueType(Type type) {
-	local.setType(type);
-    }
-
     public boolean matches(Operator loadop) {
         return loadop instanceof LocalLoadOperator && 
             ((LocalLoadOperator)loadop).getLocalInfo().getSlot()
             == local.getSlot();
     }
 
-    public int getLValuePriority() {
+    public int getPriority() {
         return 1000;
     }
 
-    public int getLValueOperandCount() {
-        return 0;
-    }
-
-    public int getLValueOperandPriority(int i) {
-        /* shouldn't be called */
-        throw new RuntimeException("LocalStoreOperator has no operands");
-    }
-
-    public Type getLValueOperandType(int i) {
-        /* shouldn't be called */
-        throw new RuntimeException("LocalStoreOperator has no operands");
-    }
-
-    public void setLValueOperandType(Type []t) {
-        /* shouldn't be called */
-        throw new RuntimeException("LocalStoreOperator has no operands");
-    }
-
-    public void dumpLValue(TabbedPrintWriter writer, Expression[] operands) {
+    public void dumpExpression(TabbedPrintWriter writer) {
 	writer.print(local.getName());
     }
 }

jode/jode/expr/LocalVarOperator.java

@@ -31,5 +31,3 @@ public interface LocalVarOperator {
      */
     public void updateType();
 }
-         
-         

jode/jode/expr/MonitorEnterOperator.java

@@ -21,20 +21,26 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class MonitorEnterOperator extends SimpleOperator {
+public class MonitorEnterOperator extends Operator {
     public MonitorEnterOperator() {
-        super(Type.tVoid, 0, 1);
-        operandTypes[0] = Type.tObject;
+        super(Type.tVoid, 0);
+	initOperands(1);
     }
 
     public int getPriority() {
         return 700;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tUObject);
+    }
+
+    public void updateType() {
+    }
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
         writer.print("MONITORENTER ");
-	operands[0].dumpExpression(writer, 700);
+	subExpressions[0].dumpExpression(writer, 700);
     }
 }

jode/jode/expr/MonitorExitOperator.java

@@ -21,20 +21,26 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class MonitorExitOperator extends SimpleOperator {
+public class MonitorExitOperator extends Operator {
     public MonitorExitOperator() {
-        super(Type.tVoid, 0, 1);
-        operandTypes[0] = Type.tObject;
+        super(Type.tVoid, 0);
+	initOperands(1);
     }
 
     public int getPriority() {
         return 700;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tUObject);
+    }
+
+    public void updateType() {
+    }
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
         writer.print("MONITOREXIT ");
-	operands[0].dumpExpression(writer, 700);
+	subExpressions[0].dumpExpression(writer, 700);
     }
 }

jode/jode/expr/NewArrayOperator.java

@@ -22,22 +22,31 @@ import jode.type.Type;
 import jode.type.ArrayType;
 import jode.decompiler.TabbedPrintWriter;
 
-public class NewArrayOperator extends SimpleOperator {
+public class NewArrayOperator extends Operator {
     String baseTypeString;
 
     public NewArrayOperator(Type arrayType, int dimensions) {
-        super(arrayType, 0, dimensions);
-        for (int i=0; i< dimensions; i++) {
-            operandTypes[i] = Type.tUInt;
-        }
+        super(arrayType, 0);
+	initOperands(dimensions);
+    }
+
+    public int getDimensions() {
+	return subExpressions.length;
     }
 
     public int getPriority() {
         return 900;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void updateSubTypes() {
+        for (int i=0; i< subExpressions.length; i++)
+            subExpressions[i].setType(Type.tUInt);
+    }
+
+    public void updateType() {
+    }
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
         Type flat = type;
 	int depth = 0;
@@ -49,8 +58,8 @@ public class NewArrayOperator extends SimpleOperator {
 	writer.printType(flat);
 	for (int i=0; i< depth; i++) {
 	    writer.print("[");
-            if (i < getOperandCount())
-		operands[i].dumpExpression(writer, 0);
+            if (i < subExpressions.length)
+		subExpressions[i].dumpExpression(writer, 0);
 	    writer.print("]");
 	}
     }

jode/jode/expr/NewOperator.java

@@ -30,8 +30,8 @@ public class NewOperator extends NoArgOperator {
         return 950;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] expr) throws java.io.IOException{
+    public void dumpExpression(TabbedPrintWriter writer)
+	throws java.io.IOException {
 	writer.print("new ");
 	writer.printType(type);
     }

jode/jode/expr/NoArgOperator.java

@@ -26,25 +26,15 @@ public abstract class NoArgOperator extends Operator {
 
     public NoArgOperator(Type type, int operator) {
         super(type, operator);
+	initOperands(0);
     }
 
     public NoArgOperator(Type type) {
         this(type, 0);
     }
 
-    public int getOperandCount() {
-        return 0;
+    public void updateType() {
     }
-
-    public int getOperandPriority(int i) {
-        throw new AssertError("This operator has no operands");
-    }
-
-    public Type getOperandType(int i) {
-        throw new AssertError("This operator has no operands");
-    }
-
-    public void setOperandType(Type[] types) {
-        throw new AssertError("This operator has no operands");
+    public void updateSubTypes() {
     }
 }

jode/jode/expr/NopOperator.java

@@ -22,33 +22,36 @@ import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
 /**
- * A NopOperator takes one or zero arguments and returns it again.  It
- * is mainly used as placeholder when the real operator is not yet
- * known (e.g. in SwitchBlock).  But there also exists a nop opcode in
- * the java virtual machine (The compiler can't create such a opcode,
- * though).
+ * A NopOperator takes one arguments and returns it again.  It is used
+ * as placeholder when the real operator is not yet known (e.g. in
+ * SwitchBlock, but also in every other Operator).
+ *
+ * A Nop operator doesn't have subExpressions; getSubExpressions() simply
+ * returns zero.
  *
  * @author Jochen Hoenicke */
-public class NopOperator extends SimpleOperator {
+public class NopOperator extends Expression {
     public NopOperator(Type type) {
-	super(type, 0, 1);
+	super(type);
     }
 
-    public NopOperator() {
-        super(Type.tVoid, 0, 0);
+    public int getFreeOperandCount() {
+	return 1;
     }
 
     public int getPriority() {
         return 1000;
     }
 
-    public Expression addOperand(Expression op) {
-	op.setType(type.getSubType());
-	return op;
+    public void updateSubTypes() {
+    }
+    public void updateType() {
     }
 
-    public int getOperandPriority(int i) {
-        return 0;
+    public Expression addOperand(Expression op) {
+	op.setType(type);
+	op.parent = parent;
+	return op;
     }
 
     public boolean isConstant() {
@@ -59,15 +62,12 @@ public class NopOperator extends SimpleOperator {
 	return (o instanceof NopOperator);
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands) 
-	throws java.io.IOException {
-        if (type == Type.tVoid)
-            writer.print("/* NOP */");
-        operands[0].dumpExpression(writer);
+    public Expression simplify() {
+	return this;
     }
 
-    public void dumpExpression(TabbedPrintWriter writer) {
+    public void dumpExpression(TabbedPrintWriter writer)
+	throws java.io.IOException {
 	writer.print("POP");
     }
 }

jode/jode/expr/Operator.java

@@ -19,7 +19,9 @@
 
 package jode.expr;
 import jode.type.Type;
+import jode.GlobalOptions;
 import jode.decompiler.TabbedPrintWriter;
+import jode.flow.VariableSet;
 
 public abstract class Operator extends Expression {
     public final static int ADD_OP     =  1;
@@ -33,6 +35,10 @@ public abstract class Operator extends Expression {
     public final static int COMPARE_OP = 26; /* must be even! */
     public final static int EQUALS_OP  = 26;
     public final static int NOTEQUALS_OP = 27;
+    public final static int LESS_OP    = 28;
+    public final static int GREATEREQ_OP = 29;
+    public final static int GREATER_OP = 30;
+    public final static int LESSEQ_OP  = 31;
     public final static int LOG_AND_OP = 32; /* must be even! */
     public final static int LOG_OR_OP  = 33;
     public final static int LOG_NOT_OP = 34;
@@ -47,73 +53,271 @@ public abstract class Operator extends Expression {
         "!", "~", "-"
     };
 
-    protected int operator;
+    protected int operatorIndex;
+    private int operandcount;
 
-    Operator (Type type, int op) {
+    Expression[] subExpressions;
+
+    public Operator(Type type) {
+	this(type,0);
+    }
+
+    public Operator(Type type, int op) {
         super(type);
-        this.operator = op;
+        this.operatorIndex = op;
         if (type == null)
             throw new jode.AssertError("type == null");
     }
 
+    public void initOperands(int opcount) {
+	operandcount = opcount;
+	subExpressions = new Expression[opcount];
+        for (int i=0; i < opcount; i++) {
+	    subExpressions[i] = new NopOperator(Type.tUnknown);
+	    subExpressions[i].parent = this;
+	}
+  	updateSubTypes();
+    }
+
+    public int getFreeOperandCount() {
+	return operandcount;
+    }
+
+    /**
+     * Tells if this is an operator, that doesn't have any
+     * subExpression, yet.
+     */
+    public boolean isFreeOperator() {
+	return subExpressions.length == 0
+	    || subExpressions[subExpressions.length-1] instanceof NopOperator;
+    }
+
+    /**
+     * Tells if this is an operator, that doesn't have any
+     * subExpression, yet, and that expects opcount operands
+     */
+    public boolean isFreeOperator(int opcount) {
+	return subExpressions.length == opcount
+	    && (opcount == 0
+		|| subExpressions[opcount-1] instanceof NopOperator);
+    }
+
     public Expression addOperand(Expression op) {
-	return new ComplexExpression
-	    (this, new Expression[getOperandCount()]).addOperand(op);
+	for (int i= subExpressions.length; i-- > 0;) {
+	    int opcount = subExpressions[i].getFreeOperandCount();
+	    if (opcount > 0) {
+		subExpressions[i] = subExpressions[i].addOperand(op);
+		operandcount
+		    += subExpressions[i].getFreeOperandCount() - opcount;
+		updateType();
+		return this;
+	    }
+	}
+	throw new jode.AssertError("addOperand called, but no operand needed");
     }
 
     public Operator getOperator() {
         return this;
     }
 
+    public Expression[] getSubExpressions() {
+        return subExpressions;
+    }
+
+    public void setSubExpressions(int i, Expression expr) {
+	int diff = expr.getFreeOperandCount()
+	    - subExpressions[i].getFreeOperandCount();
+        subExpressions[i] = expr;
+	expr.parent = this;
+	for (Operator ce = this; ce != null; ce = (Operator) ce.parent)
+	    ce.operandcount += diff;
+        updateType();
+    }
+
     public int getOperatorIndex() {
-        return operator;
+        return operatorIndex;
     }
     public void setOperatorIndex(int op) {
-        operator = op;
+        operatorIndex = op;
     }
 
     public String getOperatorString() {
-        return opString[operator];
+        return opString[operatorIndex];
+    }
+
+    public boolean opEquals(Operator o) {
+	return this == o;
+    }
+
+    public Expression simplify() {
+        for (int i=0; i< subExpressions.length; i++) {
+	    subExpressions[i] = subExpressions[i].simplify();
+	    subExpressions[i].parent = this;
+        }
+	return this;
+    }
+
+    public void fillInGenSet(VariableSet in, VariableSet gen) {
+	if (this instanceof LocalVarOperator) {
+            LocalVarOperator varOp = (LocalVarOperator) this;
+            if (varOp.isRead() && in != null)
+                in.addElement(varOp.getLocalInfo());
+            if (gen != null)
+		gen.addElement(varOp.getLocalInfo());
+	}
+        for (int i=0; i< subExpressions.length; i++)
+	    subExpressions[i].fillInGenSet(in,gen);
+
     }
 
     /**
-     * Get priority of the operator.
-     * Currently this priorities are known:
-     * <ul><li> 1000 constant
-     * </li><li> 950 new, .(field access), []
-     * </li><li> 900 new[]
-     * </li><li> 800 ++,-- (post)
-     * </li><li> 700 ++,--(pre), +,-(unary), ~, !, cast
-     * </li><li> 650 *,/, % 
-     * </li><li> 610 +,-
-     * </li><li> 600 <<, >>, >>> 
-     * </li><li> 550 >, <, >=, <=, instanceof
-     * </li><li> 500 ==, != 
-     * </li><li> 450 & 
-     * </li><li> 420 ^ 
-     * </li><li> 410 | 
-     * </li><li> 350 && 
-     * </li><li> 310 || 
-     * </li><li> 200 ?:
-     * </li><li> 100 =, +=, -=, etc.
-     * </li></ul>
+     * Checks if the value of the given expression can change, due to
+     * side effects in this expression.  If this returns false, the 
+     * expression can safely be moved behind the current expresion.
+     * @param expr the expression that should not change.
      */
-    public abstract int getPriority();
+    public boolean hasSideEffects(Expression expr) {
+	if (expr instanceof MatchableOperator
+	    && expr.containsConflictingLoad((MatchableOperator)expr))
+	    return true;
+	for (int i=0; i < subExpressions.length; i++) {
+	    if (subExpressions[i].hasSideEffects(expr))
+		return true;
+	}
+	return false;
+    }
 
-    public abstract Type getOperandType(int i);
-    public abstract int getOperandCount();
-    public abstract void setOperandType(Type[] inputTypes);
+    /**
+     * Checks if this expression contains a conflicting load, that
+     * matches the given CombineableOperator.  The sub expressions are
+     * not checked.
+     * @param op The combineable operator.
+     * @return if this expression contains a matching load.  
+     */
+    public boolean containsConflictingLoad(MatchableOperator op) {
+	if (op.matches(this))
+	    return true;
+	for (int i=0; i < subExpressions.length; i++) {
+	    if (subExpressions[i].containsConflictingLoad(op))
+		return true;
+	}
+	return false;
+    }
 
-    public abstract void dumpExpression
-	(TabbedPrintWriter writer, Expression[] operands) 
-	throws java.io.IOException;
+    /**
+     * Checks if this expression contains a matching load, that matches the
+     * given Expression.
+     * @param comb The store expression.
+     * @return true, iff this expression contains a matching load.
+     * @exception ClassCastException, if e.getOperator 
+     * is not a CombineableOperator.
+     */
+    public boolean containsMatchingLoad(CombineableOperator comb) {
+	Operator combOp = (Operator) comb;
+	if (comb.getLValue().matches(this)) {
+	    if (subsEquals(comb.getLValue()))
+		return true;
+        }
+        for (int i=0; i < subExpressions.length; i++) {
+            if (subExpressions[i].containsMatchingLoad(comb))
+                return true;
+        }
+	return false;
+    }
+
+    /**
+     * Checks if the given Expression (which must be a CombineableOperator)
+     * can be combined into this expression.
+     * @param e The store expression, must be of type void.
+     * @return 1, if it can, 0, if no match was found and -1, if a
+     * conflict was found.  You may wish to check for >0.
+     * @exception ClassCastException, if e.getOperator 
+     * is not a CombineableOperator.
+     */
+    public int canCombine(CombineableOperator combOp) {
+//  	GlobalOptions.err.println("Try to combine "+e+" into "+this);
+	if (combOp.getLValue() instanceof LocalStoreOperator
+	    && ((Operator)combOp).getFreeOperandCount() == 0) {
+	    // Special case for locals created on inlining methods, which may
+	    // combine everywhere, as long as there are no side effects.
+
+	    for (int i=0; i < subExpressions.length; i++) {
+		int result = subExpressions[i].canCombine(combOp);
+		if (result != 0)
+		    return result;
+		if (subExpressions[i].hasSideEffects((Expression)combOp))
+		    return -1;
+	    }
+	}
 
-    public void dumpExpression(TabbedPrintWriter writer)
-	throws java.io.IOException {
-	Expression[] operands = new Expression[getOperandCount()];
-        for (int i=0; i< operands.length; i++)
-	    operands[i] = new NopOperator(getOperandType(i));
-        dumpExpression(writer, operands);
+	if (combOp.lvalueMatches(this))
+	    return subsEquals((Operator)combOp) ? 1 : -1;
+	if (subExpressions.length > 0)
+	    return subExpressions[0].canCombine(combOp);
+	return 0;
     }
+
+    /**
+     * Combines the given Expression (which should be a StoreInstruction)
+     * into this expression.  You must only call this if
+     * canCombine returns the value 1.
+     * @param e The store expression.
+     * @return The combined expression.
+     * @exception ClassCastException, if e.getOperator 
+     * is not a CombineableOperator.
+     */
+    public Expression combine(CombineableOperator comb) {
+	Operator combOp = (Operator) comb;
+        if (comb.lvalueMatches(this)) {
+	    /* We already checked in canCombine that subExpressions match */
+            comb.makeNonVoid();
+	    combOp.parent = parent;
+            return combOp;
+        }
+        for (int i=0; i < subExpressions.length; i++) {
+	    Expression combined = subExpressions[i].combine(comb);
+	    if (combined != null) {
+		subExpressions[i] = combined;
+		updateType();
+		return this;
+	    }
+        }
+        return null;
+    }
+
+    public boolean subsEquals(Operator other) {
+        if (this == other)
+            return true;
+	if (other.subExpressions == null)
+	    return (subExpressions == null);
+	    
+        if (subExpressions.length != other.subExpressions.length)
+            return false;
+
+        for (int i=0; i<subExpressions.length; i++) {
+	    if(!subExpressions[i].equals(other.subExpressions[i]))
+                return false;
+        }
+        return true;
+    }
+
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+	if (!(o instanceof Operator))
+	    return false;
+	Operator other = (Operator) o;
+	return opEquals(other) && subsEquals(other);
+    }
+
+    public boolean isConstant() {
+        for (int i=0; i< subExpressions.length; i++)
+            if (!subExpressions[i].isConstant())
+                return false;
+        return true;
+    }
+
+    public abstract void dumpExpression(TabbedPrintWriter writer)
+	throws java.io.IOException;
 }
 

jode/jode/expr/PopOperator.java

@@ -21,24 +21,28 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class PopOperator extends SimpleOperator {
+public class PopOperator extends Operator {
+
+    Type popType;
 
     public PopOperator(Type argtype) {
-        super(Type.tVoid, 0, 1);
-        operandTypes[0] = argtype;
+        super(Type.tVoid, 0);
+	popType = argtype;
+	initOperands(1);
     }
 
     public int getPriority() {
         return 0;
     }
 
-    public int getOperandPriority(int i) {
-        return 0;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(popType));
+    }
+    public void updateType() {
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, 0);
+	subExpressions[0].dumpExpression(writer, 0);
     }
 }

jode/jode/expr/PrePostFixOperator.java

@@ -21,56 +21,36 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
+/**
+ * A PrePostFixOperator has one subexpression, namely the StoreInstruction.
+ */
 public class PrePostFixOperator extends Operator {
-    StoreInstruction store;
     boolean postfix;
 
-    public PrePostFixOperator(Type type, int op, 
-                              StoreInstruction store, boolean postfix) {
-        super(type, op);
-	this.store = store;
+    public PrePostFixOperator(Type type, int operatorIndex,
+			      LValueExpression lvalue, boolean postfix) {
+        super(type);
         this.postfix = postfix;
+	setOperatorIndex(operatorIndex);
+	initOperands(1);
+	setSubExpressions(0, lvalue);
     }
     
     public int getPriority() {
         return postfix ? 800 : 700;
     }
 
-    public Type getOperandType(int i) {
-	return store.getLValueOperandType(i);
-    }
-
-    public int getOperandCount() {
-        return store.getLValueOperandCount();
-    }
-
-    /**
-     * Checks if the value of the given expression can change, due to
-     * side effects in this expression.  If this returns false, the 
-     * expression can safely be moved behind the current expresion.
-     * @param expr the expression that should not change.
-     */
-    public boolean hasSideEffects(Expression expr) {
-	return store.hasSideEffects(expr);
-    }
-
-    /**
-     * Sets the return type of this operator.
-     */
-    public void setType(Type type) {
-	if (!isVoid()) {
-	    store.setLValueType(type);
-	    super.setType(store.getLValueType());
-	} else
-	    super.setType(type);
+    public void updateSubTypes() {
+	if (!isVoid())
+	    subExpressions[0].setType(type);
     }
 
-    public void setOperandType(Type[] inputTypes) {
-        store.setLValueOperandType(inputTypes);
+    public void updateType() {
+	if (!isVoid())
+	    updateParentType(subExpressions[0].getType());
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
     throws java.io.IOException {
 	boolean needBrace = false;
 	int priority = 700;
@@ -78,13 +58,7 @@ public class PrePostFixOperator extends Operator {
 	    writer.print(getOperatorString());
 	    priority = 800;
 	}
-	if (store.getLValuePriority() < priority) {
-	    needBrace = true;
-	    writer.print("(");
-	}
-	store.dumpLValue(writer, operands);
-	if (needBrace)
-	    writer.print(")");
+	subExpressions[0].dumpExpression(writer, priority);
         if (postfix)
 	    writer.print(getOperatorString());
     }

jode/jode/expr/PutFieldOperator.java

@@ -26,7 +26,7 @@ import jode.decompiler.FieldAnalyzer;
 import jode.decompiler.TabbedPrintWriter;
 import jode.decompiler.Scope;
 
-public class PutFieldOperator extends StoreInstruction {
+public class PutFieldOperator extends LValueExpression {
     CodeAnalyzer codeAnalyzer;
     boolean staticFlag;
     Reference ref;
@@ -34,13 +34,14 @@ public class PutFieldOperator extends StoreInstruction {
 
     public PutFieldOperator(CodeAnalyzer codeAnalyzer, boolean staticFlag, 
                             Reference ref) {
-        super(Type.tType(ref.getType()), ASSIGN_OP);
+        super(Type.tType(ref.getType()));
         this.codeAnalyzer = codeAnalyzer;
         this.staticFlag = staticFlag;
 	this.ref = ref;
         this.classType = Type.tType(ref.getClazz());
         if (staticFlag)
             codeAnalyzer.useType(classType);
+	initOperands(staticFlag ? 0 : 1);
     }
 
     public boolean isStatic() {
@@ -76,24 +77,23 @@ public class PutFieldOperator extends StoreInstruction {
 	    && ((GetFieldOperator)loadop).ref.equals(ref);
     }
 
-    public int getLValuePriority() {
+    public int getPriority() {
         return 950;
     }
 
-    public int getLValueOperandCount() {
-        return staticFlag?0:1;
+    public void updateSubTypes() {
+	if (!staticFlag)
+	    subExpressions[0].setType(Type.tSubType(classType));
     }
 
-    public Type getLValueOperandType(int i) {
-        return classType;
+    public void updateType() {
+	updateParentType(getFieldType());
     }
 
-    public void setLValueOperandType(Type[] t) {
-    }
-
-    public void dumpLValue(TabbedPrintWriter writer, Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	boolean opIsThis = !staticFlag && operands[0] instanceof ThisOperator;
+	boolean opIsThis = !staticFlag
+	    && subExpressions[0] instanceof ThisOperator;
 	String fieldName = ref.getName();
 	if (staticFlag) {
 	    if (!classType.equals(Type.tClass(codeAnalyzer.getClazz()))
@@ -102,38 +102,42 @@ public class PutFieldOperator extends StoreInstruction {
 		writer.print(".");
 	    }
 	    writer.print(fieldName);
-	} else if (operands[0].getType() instanceof NullType) {
+	} else if (subExpressions[0].getType() instanceof NullType) {
 	    writer.print("((");
 	    writer.printType(classType);
 	    writer.print(")");
-	    operands[0].dumpExpression(writer, 700);
+	    subExpressions[0].dumpExpression(writer, 700);
 	    writer.print(").");
 	    writer.print(fieldName);
 	} else {
 	    if (opIsThis) {
-		ThisOperator thisOp = (ThisOperator) operands[0];
+		ThisOperator thisOp = (ThisOperator) subExpressions[0];
 		Scope scope = writer.getScope(thisOp.getClassInfo(),
 					      Scope.CLASSSCOPE);
-		if (scope == null)
-		    writer.println("UNKNOWN ");
 
 		if (scope == null || writer.conflicts(fieldName, scope, 
 						      Scope.FIELDNAME)) {
 		    thisOp.dumpExpression(writer, 950);
 		    writer.print(".");
 		} else if (writer.conflicts(fieldName, scope, 
-					    Scope.AMBIGUOUSNAME)) {
+					    Scope.AMBIGUOUSNAME)
+			   || (/* This is a inherited field conflicting
+				* with a field name in some outer class.
+				*/
+			       getField() == null 
+			       && writer.conflicts(fieldName, null,
+						   Scope.FIELDNAME))) {
 		    writer.print("this.");
 		}
 	    } else {
-		operands[0].dumpExpression(writer, 950);
+		subExpressions[0].dumpExpression(writer, 950);
 		writer.print(".");
 	    }
 	    writer.print(fieldName);
 	}
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
 	return o instanceof PutFieldOperator
 	    && ((PutFieldOperator)o).ref.equals(ref);
     }

jode/jode/expr/ShiftOperator.java

@@ -29,11 +29,12 @@ public class ShiftOperator extends BinaryOperator {
         super(type, op);
     }
 
-    public Type getOperandType(int i) {
-        return (i==0) ? type : Type.tInt;
+    public void updateSubTypes() {
+	subExpressions[0].setType(Type.tSubType(type));
+	subExpressions[1].setType(Type.tSubType(Type.tInt));
     }
 
-    public void setOperandType(Type[] inputTypes) {
-	setType(inputTypes[0]);
+    public void updateType() {
+	updateParentType(Type.tSuperType(subExpressions[0].getType()));
     }
 }

jode/jode/expr/SimpleOperator.java

@@ -21,28 +21,10 @@ package jode.expr;
 import jode.type.Type;
 
 public abstract class SimpleOperator extends Operator {
-    protected Type[] operandTypes;
 
     public SimpleOperator(Type type, int operator, 
                           int operandCount) {
         super(type, operator);
-        operandTypes = new Type[operandCount];
-        for (int i=0; i< operandCount; i++) {
-            operandTypes[i] = type;
-        }
-    }
-
-    public int getOperandCount() {
-        return operandTypes.length;
-    }
-
-    public Type getOperandType(int i) {
-        return operandTypes[i];
-    }
-
-    public void setOperandType(Type[] t) {
-        for (int i=0; i< operandTypes.length; i++) {
-            operandTypes[i] = operandTypes[i].intersection(t[i]);
-        }
+	initOperands(operandCount);
     }
 }

jode/jode/expr/StoreInstruction.java

@@ -19,42 +19,29 @@
 
 package jode.expr;
 import jode.type.Type;
+import jode.GlobalOptions;
 import jode.decompiler.TabbedPrintWriter;
 
-public abstract class StoreInstruction extends Operator
+public class StoreInstruction extends Operator
     implements CombineableOperator {
 
-    public String lvCasts;
-    Type lvalueType;
-    Type rvalueType = null;
+    boolean isOpAssign = false;
 
-    public StoreInstruction(Type type, int operator) {
-        super(Type.tVoid, operator);
-        lvalueType = type;
-        lvCasts = lvalueType.toString();
+    public StoreInstruction(LValueExpression lvalue) {
+        super(Type.tVoid, ASSIGN_OP);
+	initOperands(2);
+	setSubExpressions(0, lvalue);
     }
 
-    public void makeOpAssign(int operator, Type rvalueType) {
-	setOperatorIndex(operator);
-	this.rvalueType = rvalueType;
+    public LValueExpression getLValue() {
+	return (LValueExpression) subExpressions[0];
     }
 
-    public Type getType() {
-        return type == Type.tVoid ? type : getLValueType();
-    }
-
-    public Type getLValueType() {
-        return lvalueType;
-    }
-
-    /**
-     * Checks if the value of the given expression can change, due to
-     * side effects in this expression.  If this returns false, the 
-     * expression can safely be moved behind the current expresion.
-     * @param expr the expression that should not change.
-     */
-    public boolean hasSideEffects(Expression expr) {
-	return expr.containsConflictingLoad(this);
+    public void makeOpAssign(int operatorIndex) {
+	setOperatorIndex(operatorIndex);
+	if (subExpressions[1] instanceof NopOperator)
+	    subExpressions[1].type = Type.tUnknown;
+	isOpAssign = true;
     }
 
     /**
@@ -63,64 +50,70 @@ public abstract class StoreInstruction extends Operator
     public void makeNonVoid() {
         if (type != Type.tVoid)
             throw new jode.AssertError("already non void");
-        type = lvalueType;
-        if (parent != null && parent.getOperator() == this)
-            parent.type = lvalueType;
+	type = subExpressions[0].getType();
     }
 
-    public abstract boolean matches(Operator loadop);
-    public abstract int getLValueOperandCount();
-    public abstract Type getLValueOperandType(int i);
-    public abstract void setLValueOperandType(Type [] t);
-
-    /**
-     * Sets the type of the lvalue (and rvalue).
-     */
-    public void setLValueType(Type type) {
-        lvalueType = lvalueType.intersection(type);
+    public boolean lvalueMatches(Operator loadop) {
+	return getLValue().matches(loadop);
     }
 
     public int getPriority() {
         return 100;
     }
 
-    public abstract int getLValuePriority();
-
-    public Type getOperandType(int i) {
-        if (i == getLValueOperandCount()) {
-	    if (getOperatorIndex() == ASSIGN_OP)
-		/* In a direct assignment, lvalueType is rvalueType */
-		return getLValueType(); 
-	    else
-		return rvalueType;
-        } else
-            return getLValueOperandType(i);
+    public void updateSubTypes() {
+	if (!isVoid()) {
+	    subExpressions[0].setType(type);
+	    subExpressions[1].setType(Type.tSubType(type));
+	}
     }
 
-    public void setOperandType(Type[] t) {
-        int count = getLValueOperandCount();
-        if (count > 0)
-            setLValueOperandType(t);
-	if (getOperatorIndex() == ASSIGN_OP)
-	    /* In a direct assignment, lvalueType is rvalueType */
-	    setLValueType(t[count]);
-	else
-	    rvalueType = rvalueType.intersection(t[count]);
+    public void updateType() {
+
+	Type newType;
+
+	if (!isOpAssign) {
+	    /* An opassign (+=, -=, etc.) doesn't merge rvalue type. */
+	    Type lvalueType = subExpressions[0].getType();
+	    Type rvalueType = subExpressions[1].getType();
+	    subExpressions[0].setType(Type.tSuperType(rvalueType));
+	    subExpressions[1].setType(Type.tSubType(lvalueType));
+	}
+
+	if (!isVoid())
+	    updateParentType(subExpressions[0].getType());
     }
 
-    public int getOperandCount() {
-        return 1 + getLValueOperandCount();
+    public Expression simplify() {
+	if (subExpressions[1] instanceof ConstOperator) {
+            ConstOperator one = (ConstOperator) subExpressions[1];
+
+            if ((getOperatorIndex() == OPASSIGN_OP+ADD_OP ||
+                 getOperatorIndex() == OPASSIGN_OP+SUB_OP) &&
+                (one.getValue().equals("1") 
+		 || one.getValue().equals("1.0"))) {
+
+                int op = (getOperatorIndex() == OPASSIGN_OP+ADD_OP)
+                    ? INC_OP : DEC_OP;
+
+                return new PrePostFixOperator
+                    (getType(), op, getLValue(), isVoid()).simplify();
+            }
+        }
+	return super.simplify();
     }
 
-    public abstract void dumpLValue(TabbedPrintWriter writer, 
-				    Expression[] operands)
-	throws java.io.IOException;
+    public boolean opEquals(Operator o) {
+	return o instanceof StoreInstruction
+	    && o.operatorIndex == operatorIndex
+	    && o.isVoid() == isVoid();
+    }
 
-    public void dumpExpression(TabbedPrintWriter writer, Expression[] operands)
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException
     {
-	dumpLValue(writer, operands);
+	subExpressions[0].dumpExpression(writer, 950);
 	writer.print(getOperatorString());
-	operands[getLValueOperandCount()].dumpExpression(writer, 100);
+	subExpressions[1].dumpExpression(writer, 100);
     }
 }

jode/jode/expr/StringAddOperator.java

@@ -21,31 +21,40 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class StringAddOperator extends SimpleOperator {
+public class StringAddOperator extends Operator {
     protected Type operandType;
 
     public StringAddOperator() {
-        super(Type.tString, ADD_OP, 2);
-        operandTypes[1] = Type.tUnknown;
+        super(Type.tString, ADD_OP);
+	initOperands(2);
     }
 
-    public void clearFirstType() {
-	operandTypes[0] = Type.tUnknown;
-    }
-    
     public int getPriority() {
         return 610;
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
 	return (o instanceof StringAddOperator);
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void updateSubTypes() {
+	/* A string add allows everything */
+    }
+
+    public void updateType() {
+    }
+    
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
-	operands[0].dumpExpression(writer, 610);
+
+	if (!subExpressions[0].getType().isOfType(Type.tString)
+	    && !subExpressions[1].getType().isOfType(Type.tString))
+	    writer.print("\"\" + ");
+
+	subExpressions[0].dumpExpression(writer, 610);
 	writer.print(getOperatorString());
-	operands[1].dumpExpression(writer, 611);
+	subExpressions[1].dumpExpression(writer, 611);
     }
 }
+

jode/jode/expr/ThisOperator.java

@@ -20,6 +20,7 @@
 package jode.expr;
 import jode.type.Type;
 import jode.bytecode.ClassInfo;
+import jode.decompiler.Scope;
 import jode.decompiler.TabbedPrintWriter;
 
 public class ThisOperator extends NoArgOperator {
@@ -48,19 +49,18 @@ public class ThisOperator extends NoArgOperator {
         return classInfo+".this";
     }
 
-    public boolean equals(Object o) {
+    public boolean opEquals(Operator o) {
         return (o instanceof ThisOperator &&
                 ((ThisOperator) o).classInfo.equals(classInfo));
     }
 
-    public void dumpExpression(TabbedPrintWriter writer,
-			       Expression[] operands) 
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	if (!isInnerMost) {
-	    writer.print(writer.getClassString(classInfo));
+	    writer.print(writer.getClassString(classInfo, 
+					       Scope.AMBIGUOUSNAME));
 	    writer.print(".");
 	}
 	writer.print("this");
     }
 }
-

jode/jode/expr/UnaryOperator.java

@@ -21,33 +21,42 @@ package jode.expr;
 import jode.type.Type;
 import jode.decompiler.TabbedPrintWriter;
 
-public class UnaryOperator extends SimpleOperator {
+public class UnaryOperator extends Operator {
     public UnaryOperator(Type type, int op) {
-        super(type, op, 1);
+        super(type, op);
+	initOperands(1);
     }
     
     public int getPriority() {
         return 700;
     }
 
-    /**
-     * Sets the return type of this operator.
-     */
-    public void setType(Type type) {
-        super.setType(type);
-        Type newOpType = type.intersection(operandTypes[0]);
-        operandTypes[0] = newOpType;
+    public Expression negate() {
+        if (getOperatorIndex() == LOG_NOT_OP) {
+	    if (subExpressions != null)
+		return subExpressions[0];
+	    else
+		return new NopOperator(Type.tBoolean);
+        }
+	return super.negate();
     }
 
-    public boolean equals(Object o) {
-	return (o instanceof UnaryOperator) &&
-	    ((UnaryOperator)o).operator == operator;
+    public void updateSubTypes() {
+        subExpressions[0].setType(Type.tSubType(type));
     }
 
-    public void dumpExpression(TabbedPrintWriter writer, 
-			       Expression[] operands)
+    public void updateType() {
+	updateParentType(Type.tSuperType(subExpressions[0].getType()));
+    }
+
+    public boolean opEquals(Operator o) {
+	return (o instanceof UnaryOperator)
+	    && o.operatorIndex == operatorIndex;
+    }
+
+    public void dumpExpression(TabbedPrintWriter writer)
 	throws java.io.IOException {
 	writer.print(getOperatorString());
-	operands[0].dumpExpression(writer, 700);
+	subExpressions[0].dumpExpression(writer, 700);
     }
 }