This commit was generated by cvs2svn to compensate for changes in r2, which

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git-svn-id: http://anonsvn.jboss.org/repos/javassist/trunk@6 30ef5769-5b8d-40dd-aea6-55b5d6557bb3

22 files changed, 1399 insertions, 0 deletions

diff --git a/src/main/javassist/compiler/ast/ASTList.java b/src/main/javassist/compiler/ast/ASTList.java
new file mode 100644
index 00000000..887a528a
--- /dev/null
+++ b/src/main/javassist/compiler/ast/ASTList.java
@@ -0,0 +1,169 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * A linked list.
+ * The right subtree must be an ASTList object or null.
+ */
+public class ASTList extends ASTree {
+    private ASTree left;
+    private ASTList right;
+
+    public ASTList(ASTree _head, ASTList _tail) {
+	left = _head;
+	right = _tail;
+    }
+
+    public ASTList(ASTree _head) {
+	left = _head;
+	right = null;
+    }
+
+    public static ASTList make(ASTree e1, ASTree e2, ASTree e3) {
+	return new ASTList(e1, new ASTList(e2, new ASTList(e3)));
+    }
+
+    public ASTree getLeft() { return left; }
+
+    public ASTree getRight() { return right; }
+
+    public void setLeft(ASTree _left) { left = _left; }
+
+    public void setRight(ASTree _right) {
+	right = (ASTList)_right;
+    }
+
+    /**
+     * Returns the car part of the list.
+     */
+    public ASTree head() { return left; }
+
+    public void setHead(ASTree _head) {
+	left = _head;
+    }
+
+    /**
+     * Returns the cdr part of the list.
+     */
+    public ASTList tail() { return right; }
+
+    public void setTail(ASTList _tail) {
+	right = _tail;
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atASTList(this); }
+
+    public String toString() {
+	StringBuffer sbuf = new StringBuffer();
+	sbuf.append("(<");
+	sbuf.append(getTag());
+	sbuf.append('>');
+	ASTList list = this;
+	while (list != null) {
+	    sbuf.append(' ');
+	    ASTree a = list.left;
+	    sbuf.append(a == null ? "<null>" : a.toString());
+	    list = list.right;
+	}
+
+	sbuf.append(')');
+	return sbuf.toString();
+    }
+
+    /**
+     * Returns the number of the elements in this list.
+     */
+    public int length() {
+	return length(this);
+    }
+
+    public static int length(ASTList list) {
+	if (list == null)
+	    return 0;
+
+	int n = 0;
+	while (list != null) {
+	    list = list.right;
+	    ++n;
+	}
+
+	return n;
+    }
+
+    /**
+     * Returns a sub list of the list.  The sub list begins with the
+     * n-th element of the list.
+     *
+     * @param nth	zero or more than zero.
+     */
+    public ASTList sublist(int nth) {
+	ASTList list = this;
+	while (nth-- > 0)
+	    list = list.right;
+
+	return list;
+    }
+
+    /**
+     * Substitutes <code>newObj</code> for <code>oldObj</code> in the
+     * list.
+     */
+    public boolean subst(ASTree newObj, ASTree oldObj) {
+	for (ASTList list = this; list != null; list = list.right)
+	    if (list.left == oldObj) {
+		list.left = newObj;
+		return true;
+	    }
+
+	return false;
+    }
+
+    /**
+     * Appends an object to a list.
+     */
+    public static ASTList append(ASTList a, ASTree b) {
+	return concat(a, new ASTList(b));
+    }
+
+    /**
+     * Concatenates two lists.
+     */
+    public static ASTList concat(ASTList a, ASTList b) {
+	if (a == null)
+	    return b;
+	else {
+	    ASTList list = a;
+	    while (list.right != null)
+		list = list.right;
+
+	    list.right = b;
+	    return a;
+	}
+    }
+}
diff --git a/src/main/javassist/compiler/ast/ASTree.java b/src/main/javassist/compiler/ast/ASTree.java
new file mode 100644
index 00000000..72825142
--- /dev/null
+++ b/src/main/javassist/compiler/ast/ASTree.java
@@ -0,0 +1,68 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import java.io.Serializable;
+import javassist.compiler.CompileError;
+
+/**
+ * Abstract Syntax Tree.  An ASTree object represents a node of
+ * a binary tree.  If the node is a leaf node, both <code>getLeft()</code>
+ * and <code>getRight()</code> returns null.
+ */
+public abstract class ASTree implements Serializable {
+    public ASTree getLeft() { return null; }
+
+    public ASTree getRight() { return null; }
+
+    public void setLeft(ASTree _left) {}
+
+    public void setRight(ASTree _right) {}
+
+    /**
+     * Is a method for the visitor pattern.  It calls
+     * <code>atXXX()</code> on the given visitor, where
+     * <code>XXX</code> is the class name of the node object.
+     */
+    public abstract void accept(Visitor v) throws CompileError;
+
+    public String toString() {
+	StringBuffer sbuf = new StringBuffer();
+	sbuf.append('<');
+	sbuf.append(getTag());
+	sbuf.append('>');
+	return sbuf.toString();
+    }
+
+    /**
+     * Returns the type of this node.  This method is used by
+     * <code>toString()</code>.
+     */
+    protected String getTag() {
+	String name = getClass().getName();
+	return name.substring(name.lastIndexOf('.') + 1);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/AssignExpr.java b/src/main/javassist/compiler/ast/AssignExpr.java
new file mode 100644
index 00000000..0a062d46
--- /dev/null
+++ b/src/main/javassist/compiler/ast/AssignExpr.java
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Assignment expression.
+ */
+public class AssignExpr extends Expr {
+    /* operator must be either of:
+     * =, %=, &=, *=, +=, -=, /=, ^=, |=, <<=, >>=, >>>=
+     */
+
+    public AssignExpr(int op, ASTree _head, ASTList _tail) {
+	super(op, _head, _tail);
+    }
+
+    public static AssignExpr makeAssign(int op, ASTree oprand1,
+					ASTree oprand2) {
+	return new AssignExpr(op, oprand1, new ASTList(oprand2));
+    }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atAssignExpr(this);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/BinExpr.java b/src/main/javassist/compiler/ast/BinExpr.java
new file mode 100644
index 00000000..a8fdeb62
--- /dev/null
+++ b/src/main/javassist/compiler/ast/BinExpr.java
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Binary expression.
+ */
+public class BinExpr extends Expr {
+    /* operator must be either of:
+     * ||, &&, |, ^, &, ==, !=, <=, >=, <, >,
+     * <<, >>, >>>, +, -, *, /, %
+     */
+
+    public BinExpr(int op, ASTree _head, ASTList _tail) {
+	super(op, _head, _tail);
+    }
+
+    public static BinExpr makeBin(int op, ASTree oprand1, ASTree oprand2) {
+	return new BinExpr(op, oprand1, new ASTList(oprand2));
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atBinExpr(this); }
+}
diff --git a/src/main/javassist/compiler/ast/CastExpr.java b/src/main/javassist/compiler/ast/CastExpr.java
new file mode 100644
index 00000000..7f8775cb
--- /dev/null
+++ b/src/main/javassist/compiler/ast/CastExpr.java
@@ -0,0 +1,63 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.TokenId;
+import javassist.compiler.CompileError;
+
+/**
+ * Cast expression.
+ */
+public class CastExpr extends ASTList implements TokenId {
+    protected int castType;
+    protected int arrayDim;
+
+    public CastExpr(ASTList className, int dim, ASTree expr) {
+	super(className, new ASTList(expr));
+	castType = CLASS;
+	arrayDim = dim;
+    }
+
+    public CastExpr(int type, int dim, ASTree expr) {
+	super(null, new ASTList(expr));
+	castType = type;
+	arrayDim = dim;
+    }
+
+    /* Returns CLASS, BOOLEAN, INT, or ...
+     */
+    public int getType() { return castType; }
+
+    public int getArrayDim() { return arrayDim; }
+
+    public ASTList getClassName() { return (ASTList)getLeft(); }
+
+    public ASTree getOprand() { return getRight().getLeft(); }
+
+    public String getTag() { return "cast:" + castType + ":" + arrayDim; }
+
+    public void accept(Visitor v) throws CompileError { v.atCastExpr(this); }
+}
diff --git a/src/main/javassist/compiler/ast/CondExpr.java b/src/main/javassist/compiler/ast/CondExpr.java
new file mode 100644
index 00000000..d4a8a108
--- /dev/null
+++ b/src/main/javassist/compiler/ast/CondExpr.java
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Conditional expression.
+ */
+public class CondExpr extends ASTList {
+    public CondExpr(ASTree cond, ASTree thenp, ASTree elsep) {
+	super(cond, new ASTList(thenp, new ASTList(elsep)));
+    }
+
+    public ASTree condExpr() { return head(); }
+
+    public ASTree thenExpr() { return tail().head(); }
+
+    public ASTree elseExpr() { return tail().tail().head(); }
+
+    public String getTag() { return "?:"; }
+
+    public void accept(Visitor v) throws CompileError { v.atCondExpr(this); }
+}
diff --git a/src/main/javassist/compiler/ast/Declarator.java b/src/main/javassist/compiler/ast/Declarator.java
new file mode 100644
index 00000000..edeb839d
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Declarator.java
@@ -0,0 +1,128 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.TokenId;
+import javassist.compiler.CompileError;
+
+/**
+ * Variable declarator.
+ */
+public class Declarator extends ASTList implements TokenId {
+    protected int varType;
+    protected int arrayDim;
+    protected int localVar;
+    protected String qualifiedClass;	// JVM-internal representation
+
+    public Declarator(int type, int dim) {
+	super(null);
+	varType = type;
+	arrayDim = dim;
+	localVar = -1;
+	qualifiedClass = null;
+    }
+
+    public Declarator(ASTList className, int dim) {
+	super(null);
+	varType = CLASS;
+	arrayDim = dim;
+	localVar = -1;
+	qualifiedClass = astToClassName(className, '/');
+    }
+
+    /* For declaring a pre-defined? local variable.
+     */
+    public Declarator(int type, String jvmClassName, int dim,
+		      int var, Symbol sym) {
+	super(null);
+	varType = type;
+	arrayDim = dim;
+	localVar = var;
+	qualifiedClass = jvmClassName;
+	setLeft(sym);
+	append(this, null);	// initializer
+    }
+
+    public Declarator make(Symbol sym, int dim, ASTree init) {
+	Declarator d = new Declarator(this.varType, this.arrayDim + dim);
+	d.qualifiedClass = this.qualifiedClass;
+	d.setLeft(sym);
+	d.append(d, init);
+	return d;
+    }
+
+    /* Returns CLASS, BOOLEAN, BYTE, CHAR, SHORT, INT, LONG, FLOAT,
+     * or DOUBLE (or VOID)
+     */
+    public int getType() { return varType; }
+
+    public int getArrayDim() { return arrayDim; }
+
+    public void addArrayDim(int d) { arrayDim += d; }
+
+    public String getClassName() { return qualifiedClass; }
+
+    public void setClassName(String s) { qualifiedClass = s; }
+
+    public Symbol getVariable() { return (Symbol)getLeft(); }
+
+    public void setVariable(Symbol sym) { setLeft(sym); }
+
+    public ASTree getInitializer() {
+	ASTList t = tail();
+	if (t != null)
+	    return t.head();
+	else
+	    return null;
+    }
+
+    public void setLocalVar(int n) { localVar = n; }
+
+    public int getLocalVar() { return localVar; }
+
+    public String getTag() { return "decl"; }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atDeclarator(this);
+    }
+
+    public static String astToClassName(ASTList name, char sep) {
+	if (name == null)
+	    return null;
+
+	StringBuffer sbuf = new StringBuffer();
+	for (;;) {
+	    sbuf.append(((Symbol)name.head()).get());
+	    name = name.tail();
+	    if (name == null)
+		break;
+
+	    sbuf.append(sep);
+	}
+
+	return sbuf.toString();
+    }
+}
diff --git a/src/main/javassist/compiler/ast/DoubleConst.java b/src/main/javassist/compiler/ast/DoubleConst.java
new file mode 100644
index 00000000..459f030f
--- /dev/null
+++ b/src/main/javassist/compiler/ast/DoubleConst.java
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Double constant.
+ */
+public class DoubleConst extends ASTree {
+    protected double value;
+    protected int type;
+
+    public DoubleConst(double v, int tokenId) { value = v; type = tokenId; }
+
+    public double get() { return value; }
+
+    /* Returns DoubleConstant or FloatConstant
+     */
+    public int getType() { return type; }
+
+    public String toString() { return Double.toString(value); }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atDoubleConst(this);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/Expr.java b/src/main/javassist/compiler/ast/Expr.java
new file mode 100644
index 00000000..1fecc9ce
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Expr.java
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.TokenId;
+import javassist.compiler.CompileError;
+
+/**
+ * Expression.
+ */
+public class Expr extends ASTList implements TokenId {
+    /* operator must be either of:
+     * (unary) +, (unary) -, ++, --, !, ~,
+     * CALL, ARRAY, . (dot), MEMBER (static member access).
+     * Otherwise, the object should be an instance of a subclass.
+     */
+
+    protected int operatorId;
+
+    public Expr(int op, ASTree _head, ASTList _tail) {
+	super(_head, _tail);
+	operatorId = op;
+    }
+
+    public Expr(int op, ASTree _head) {
+	super(_head);
+	operatorId = op;
+    }
+
+    public static Expr make(int op, ASTree oprand1, ASTree oprand2) {
+	return new Expr(op, oprand1, new ASTList(oprand2));
+    }
+
+    public int getOperator() { return operatorId; }
+
+    public ASTree oprand1() { return getLeft(); }
+
+    public ASTree oprand2() { return getRight().getLeft(); }
+
+    public void accept(Visitor v) throws CompileError { v.atExpr(this); }
+
+    public String getName() {
+	int id = operatorId;
+	if (id < 128)
+	    return String.valueOf((char)id);
+	else if (NEQ <= id && id <= ARSHIFT_E)
+	    return opNames[id - NEQ];
+	else if (id == INSTANCEOF)
+	    return "instanceof";
+	else
+	    return String.valueOf(id);
+    }
+
+    protected String getTag() {
+	return "op:" + getName();
+    }
+}
diff --git a/src/main/javassist/compiler/ast/FieldDecl.java b/src/main/javassist/compiler/ast/FieldDecl.java
new file mode 100644
index 00000000..d57dd632
--- /dev/null
+++ b/src/main/javassist/compiler/ast/FieldDecl.java
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+public class FieldDecl extends ASTList {
+    public FieldDecl(ASTree _head, ASTList _tail) {
+	super(_head, _tail);
+    }
+
+    public ASTList getModifiers() { return (ASTList)getLeft(); }
+
+    public Declarator getDeclarator() { return (Declarator)tail().head(); }
+
+    public ASTree getInit() { return (ASTree)sublist(2).head(); }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atFieldDecl(this);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/InstanceOfExpr.java b/src/main/javassist/compiler/ast/InstanceOfExpr.java
new file mode 100644
index 00000000..03d6bc1f
--- /dev/null
+++ b/src/main/javassist/compiler/ast/InstanceOfExpr.java
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Instanceof expression.
+ */
+public class InstanceOfExpr extends CastExpr {
+    public InstanceOfExpr(ASTList className, int dim, ASTree expr) {
+	super(className, dim, expr);
+    }
+
+    public InstanceOfExpr(int type, int dim, ASTree expr) {
+	super(type, dim, expr);
+    }
+
+    public String getTag() {
+	return "instanceof:" + castType + ":" + arrayDim;
+    }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atInstanceOfExpr(this);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/IntConst.java b/src/main/javassist/compiler/ast/IntConst.java
new file mode 100644
index 00000000..63ce70cb
--- /dev/null
+++ b/src/main/javassist/compiler/ast/IntConst.java
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Integer constant.
+ */
+public class IntConst extends ASTree {
+    protected long value;
+    protected int type;
+
+    public IntConst(long v, int tokenId) { value = v; type = tokenId; }
+
+    public long get() { return value; }
+
+    /* Returns IntConstant, CharConstant, or LongConstant.
+     */
+    public int getType() { return type; }
+
+    public String toString() { return Long.toString(value); }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atIntConst(this);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/Keyword.java b/src/main/javassist/compiler/ast/Keyword.java
new file mode 100644
index 00000000..9e1798ec
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Keyword.java
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Keyword.
+ */
+public class Keyword extends ASTree {
+    protected int tokenId;
+
+    public Keyword(int token) {
+	tokenId = token;
+    }
+
+    public int get() { return tokenId; }
+
+    public String toString() { return "id:" + tokenId; }
+
+    public void accept(Visitor v) throws CompileError { v.atKeyword(this); }
+}
diff --git a/src/main/javassist/compiler/ast/Member.java b/src/main/javassist/compiler/ast/Member.java
new file mode 100644
index 00000000..a4825874
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Member.java
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Member name.
+ */
+public class Member extends Symbol {
+    public Member(String name) {
+	super(name);
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atMember(this); }
+}
diff --git a/src/main/javassist/compiler/ast/MethodDecl.java b/src/main/javassist/compiler/ast/MethodDecl.java
new file mode 100644
index 00000000..3c529014
--- /dev/null
+++ b/src/main/javassist/compiler/ast/MethodDecl.java
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+public class MethodDecl extends ASTList {
+    public static final String initName = "<init>";
+
+    public MethodDecl(ASTree _head, ASTList _tail) {
+	super(_head, _tail);
+    }
+
+    public boolean isConstructor() {
+	Symbol sym = getReturn().getVariable();
+	return sym != null && initName.equals(sym.get());
+    }
+
+    public ASTList getModifiers() { return (ASTList)getLeft(); }
+
+    public Declarator getReturn() { return (Declarator)tail().head(); }
+
+    public ASTList getParams() { return (ASTList)sublist(2).head(); }
+
+    public ASTList getThrows() { return (ASTList)sublist(3).head(); }
+
+    public Stmnt getBody() { return (Stmnt)sublist(4).head(); }
+
+    public void accept(Visitor v) throws CompileError {
+	v.atMethodDecl(this);
+    }
+}
diff --git a/src/main/javassist/compiler/ast/NewExpr.java b/src/main/javassist/compiler/ast/NewExpr.java
new file mode 100644
index 00000000..33c721ed
--- /dev/null
+++ b/src/main/javassist/compiler/ast/NewExpr.java
@@ -0,0 +1,87 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.TokenId;
+import javassist.compiler.CompileError;
+
+/**
+ * New Expression.
+ */
+public class NewExpr extends ASTList implements TokenId {
+    protected boolean newArray;
+    protected int arrayType;
+
+    public NewExpr(ASTList className, ASTList args) {
+	super(className, new ASTList(args));
+	newArray = false;
+	arrayType = CLASS;
+    }
+
+    public NewExpr(int type, ASTList arraySize, ASTree init) {
+	super(null, new ASTList(arraySize));
+	newArray = true;
+	arrayType = type;
+	if (init != null)
+	    append(this, init);
+    }
+
+    public static NewExpr makeObjectArray(ASTList className,
+					  ASTList arraySize, ASTree init) {
+	NewExpr e = new NewExpr(className, arraySize);
+	e.newArray = true;
+	if (init != null)
+	    append(e, init);
+
+	return e;
+    }
+
+    public boolean isArray() { return newArray; }
+
+    /* TokenId.CLASS, TokenId.INT, ...
+     */
+    public int getArrayType() { return arrayType; }
+
+    public ASTList getClassName() { return (ASTList)getLeft(); }
+
+    public ASTList getArguments() { return (ASTList)getRight().getLeft(); }
+
+    public ASTList getArraySize() { return getArguments(); }
+
+    public ASTree getInitializer() {
+	ASTree t = getRight().getRight();
+	if (t == null)
+	    return null;
+	else
+	    return t.getLeft();
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atNewExpr(this); }
+
+    protected String getTag() {
+	return newArray ? "new[]" : "new";
+    }
+}
diff --git a/src/main/javassist/compiler/ast/Pair.java b/src/main/javassist/compiler/ast/Pair.java
new file mode 100644
index 00000000..520207a8
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Pair.java
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * A node of a a binary tree.  This class provides concrete methods
+ * overriding abstract methods in ASTree.
+ */
+public class Pair extends ASTree {
+    protected ASTree left, right;
+
+    public Pair(ASTree _left, ASTree _right) {
+	left = _left;
+	right = _right;
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atPair(this); }
+
+    public String toString() {
+	StringBuffer sbuf = new StringBuffer();
+	sbuf.append("(<Pair> ");
+	sbuf.append(left == null ? "<null>" : left.toString());
+	sbuf.append(" . ");
+	sbuf.append(right == null ? "<null>" : right.toString());
+	sbuf.append(')');
+	return sbuf.toString();
+    }
+
+    public ASTree getLeft() { return left; }
+
+    public ASTree getRight() { return right; }
+
+    public void setLeft(ASTree _left) { left = _left; }
+
+    public void setRight(ASTree _right) { right = _right; }
+}
diff --git a/src/main/javassist/compiler/ast/Stmnt.java b/src/main/javassist/compiler/ast/Stmnt.java
new file mode 100644
index 00000000..c6b9a97e
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Stmnt.java
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.TokenId;
+import javassist.compiler.CompileError;
+
+/**
+ * Statement.
+ */
+public class Stmnt extends ASTList implements TokenId {
+    protected int operatorId;
+
+    public Stmnt(int op, ASTree _head, ASTList _tail) {
+	super(_head, _tail);
+	operatorId = op;
+    }
+
+    public Stmnt(int op, ASTree _head) {
+	super(_head);
+	operatorId = op;
+    }
+
+    public Stmnt(int op) {
+	this(op, null);
+    }
+
+    public static Stmnt make(int op, ASTree oprand1, ASTree oprand2) {
+	return new Stmnt(op, oprand1, new ASTList(oprand2));
+    }
+
+    public static Stmnt make(int op, ASTree op1, ASTree op2, ASTree op3) {
+	return new Stmnt(op, op1, new ASTList(op2, new ASTList(op3)));
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atStmnt(this); }
+
+    public int getOperator() { return operatorId; }
+
+    protected String getTag() {
+	if (operatorId < 128)
+	    return "stmnt:" + (char)operatorId;
+	else
+	    return "stmnt:" + operatorId;
+    }
+}
diff --git a/src/main/javassist/compiler/ast/StringL.java b/src/main/javassist/compiler/ast/StringL.java
new file mode 100644
index 00000000..5f173f50
--- /dev/null
+++ b/src/main/javassist/compiler/ast/StringL.java
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * String literal.
+ */
+public class StringL extends ASTree {
+    protected String text;
+
+    public StringL(String t) {
+	text = t;
+    }
+
+    public String get() { return text; }
+
+    public String toString() { return "\"" + text + "\""; }
+
+    public void accept(Visitor v) throws CompileError { v.atStringL(this); }
+}
diff --git a/src/main/javassist/compiler/ast/Symbol.java b/src/main/javassist/compiler/ast/Symbol.java
new file mode 100644
index 00000000..c8e753bf
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Symbol.java
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Identifier.
+ */
+public class Symbol extends ASTree {
+    protected String identifier;
+
+    public Symbol(String sym) {
+	identifier = sym;
+    }
+
+    public String get() { return identifier; }
+
+    public String toString() { return identifier; }
+
+    public void accept(Visitor v) throws CompileError { v.atSymbol(this); }
+}
diff --git a/src/main/javassist/compiler/ast/Variable.java b/src/main/javassist/compiler/ast/Variable.java
new file mode 100644
index 00000000..16112a99
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Variable.java
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * Variable.
+ */
+public class Variable extends Symbol {
+    protected Declarator declarator;
+
+    public Variable(String sym, Declarator d) {
+	super(sym);
+	declarator = d;
+    }
+
+    public Declarator getDeclarator() { return declarator; }
+
+    public String toString() {
+	return identifier + ":" + declarator.getType();
+    }
+
+    public void accept(Visitor v) throws CompileError { v.atVariable(this); }
+}
diff --git a/src/main/javassist/compiler/ast/Visitor.java b/src/main/javassist/compiler/ast/Visitor.java
new file mode 100644
index 00000000..685713de
--- /dev/null
+++ b/src/main/javassist/compiler/ast/Visitor.java
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import javassist.compiler.CompileError;
+
+/**
+ * The visitor pattern.
+ *
+ * @see ast.ASTree#accept(Visitor)
+ */
+public class Visitor {
+    public void atASTList(ASTList n) throws CompileError {}
+    public void atPair(Pair n) throws CompileError {}
+
+    public void atFieldDecl(FieldDecl n) throws CompileError {}
+    public void atMethodDecl(MethodDecl n) throws CompileError {}
+    public void atStmnt(Stmnt n) throws CompileError {}
+    public void atDeclarator(Declarator n) throws CompileError {}
+
+    public void atAssignExpr(AssignExpr n) throws CompileError {}
+    public void atCondExpr(CondExpr n) throws CompileError {}
+    public void atBinExpr(BinExpr n) throws CompileError {}
+    public void atExpr(Expr n) throws CompileError {}
+    public void atCastExpr(CastExpr n) throws CompileError {}
+    public void atInstanceOfExpr(InstanceOfExpr n) throws CompileError {}
+    public void atNewExpr(NewExpr n) throws CompileError {}
+
+    public void atSymbol(Symbol n) throws CompileError {}
+    public void atMember(Member n) throws CompileError {}
+    public void atVariable(Variable n) throws CompileError {}
+    public void atKeyword(Keyword n) throws CompileError {}
+    public void atStringL(StringL n) throws CompileError {}
+    public void atIntConst(IntConst n) throws CompileError {}
+    public void atDoubleConst(DoubleConst n) throws CompileError {}
+}