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	/*
	* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.tools.tree;

	import sun.tools.java.*;
	import java.io.PrintStream;
	import java.util.Hashtable;

	/**
	* WARNING: The contents of this source file are not part of any
	* supported API. Code that depends on them does so at its own risk:
	* they are subject to change or removal without notice.
	*/
	public
	class UnaryExpression extends Expression {
	Expression right;

	/**
	* Constructor
	*/
	UnaryExpression(int op, long where, Type type, Expression right) {
	super(op, where, type);
	this.right = right;
	}

	/**
	* Order the expression based on precedence
	*/
	public Expression order() {
	if (precedence() > right.precedence()) {
	UnaryExpression e = (UnaryExpression)right;
	right = e.right;
	e.right = order();
	return e;
	}
	return this;
	}

	/**
	* Select the type of the expression
	*/
	void selectType(Environment env, Context ctx, int tm) {
	throw new CompilerError("selectType: " + opNames[op]);
	}

	/**
	* Check a unary expression
	*/
	public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) {
	vset = right.checkValue(env, ctx, vset, exp);

	int tm = right.type.getTypeMask();
	selectType(env, ctx, tm);
	if (((tm & TM_ERROR) == 0) && type.isType(TC_ERROR)) {
	env.error(where, "invalid.arg", opNames[op]);
	}
	return vset;
	}

	/**
	* Check if constant
	*/
	public boolean isConstant() {
	switch (op) {
	case POS:
	case NEG:
	case BITNOT:
	case NOT:
	case EXPR:
	case CONVERT: // generated inside of CastExpression
	return right.isConstant();
	}
	return false;
	}

	/**
	* Evaluate
	*/
	Expression eval(int a) {
	return this;
	}
	Expression eval(long a) {
	return this;
	}
	Expression eval(float a) {
	return this;
	}
	Expression eval(double a) {
	return this;
	}
	Expression eval(boolean a) {
	return this;
	}
	Expression eval(String a) {
	return this;
	}
	Expression eval() {
	switch (right.op) {
	case BYTEVAL:
	case CHARVAL:
	case SHORTVAL:
	case INTVAL:
	return eval(((IntegerExpression)right).value);
	case LONGVAL:
	return eval(((LongExpression)right).value);
	case FLOATVAL:
	return eval(((FloatExpression)right).value);
	case DOUBLEVAL:
	return eval(((DoubleExpression)right).value);
	case BOOLEANVAL:
	return eval(((BooleanExpression)right).value);
	case STRINGVAL:
	return eval(((StringExpression)right).value);
	}
	return this;
	}

	/**
	* Inline
	*/
	public Expression inline(Environment env, Context ctx) {
	return right.inline(env, ctx);
	}
	public Expression inlineValue(Environment env, Context ctx) {
	right = right.inlineValue(env, ctx);
	try {
	return eval().simplify();
	} catch (ArithmeticException e) {
	// Got rid of this error message. It isn't illegal to
	// have a program which does a constant division by
	// zero. We return `this' to make the compiler to
	// generate code here.
	// (bugs 4019304, 4089107).
	//
	// I am not positive that this catch is ever reached.
	//
	// env.error(where, "arithmetic.exception");
	return this;
	}
	}

	/**
	* Create a copy of the expression for method inlining
	*/
	public Expression copyInline(Context ctx) {
	UnaryExpression e = (UnaryExpression)clone();
	if (right != null) {
	e.right = right.copyInline(ctx);
	}
	return e;
	}

	/**
	* The cost of inlining this expression
	*/
	public int costInline(int thresh, Environment env, Context ctx) {
	return 1 + right.costInline(thresh, env, ctx);
	}

	/**
	* Print
	*/
	public void print(PrintStream out) {
	out.print("(" + opNames[op] + " ");
	right.print(out);
	out.print(")");
	}
	}

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