Source Code Cross Referenced for UnaryExpression.java in  » 6.0-JDK-Modules-sun » tools » sun » tools » tree » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules sun » tools » sun.tools.tree 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1994-2003 Sun Microsystems, Inc.  All Rights Reserved.
003:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004:         *
005:         * This code is free software; you can redistribute it and/or modify it
006:         * under the terms of the GNU General Public License version 2 only, as
007:         * published by the Free Software Foundation.  Sun designates this
008:         * particular file as subject to the "Classpath" exception as provided
009:         * by Sun in the LICENSE file that accompanied this code.
010:         *
011:         * This code is distributed in the hope that it will be useful, but WITHOUT
012:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014:         * version 2 for more details (a copy is included in the LICENSE file that
015:         * accompanied this code).
016:         *
017:         * You should have received a copy of the GNU General Public License version
018:         * 2 along with this work; if not, write to the Free Software Foundation,
019:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020:         *
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022:         * CA 95054 USA or visit www.sun.com if you need additional information or
023:         * have any questions.
024:         */
025:
026:        package sun.tools.tree;
027:
028:        import sun.tools.java.*;
029:        import java.io.PrintStream;
030:        import java.util.Hashtable;
031:
032:        /**
033:         * WARNING: The contents of this source file are not part of any
034:         * supported API.  Code that depends on them does so at its own risk:
035:         * they are subject to change or removal without notice.
036:         */
037:        public class UnaryExpression extends Expression {
038:            Expression right;
039:
040:            /**
041:             * Constructor
042:             */
043:            UnaryExpression(int op, long where, Type type, Expression right) {
044:                super (op, where, type);
045:                this .right = right;
046:            }
047:
048:            /**
049:             * Order the expression based on precedence
050:             */
051:            public Expression order() {
052:                if (precedence() > right.precedence()) {
053:                    UnaryExpression e = (UnaryExpression) right;
054:                    right = e.right;
055:                    e.right = order();
056:                    return e;
057:                }
058:                return this ;
059:            }
060:
061:            /**
062:             * Select the type of the expression
063:             */
064:            void selectType(Environment env, Context ctx, int tm) {
065:                throw new CompilerError("selectType: " + opNames[op]);
066:            }
067:
068:            /**
069:             * Check a unary expression
070:             */
071:            public Vset checkValue(Environment env, Context ctx, Vset vset,
072:                    Hashtable exp) {
073:                vset = right.checkValue(env, ctx, vset, exp);
074:
075:                int tm = right.type.getTypeMask();
076:                selectType(env, ctx, tm);
077:                if (((tm & TM_ERROR) == 0) && type.isType(TC_ERROR)) {
078:                    env.error(where, "invalid.arg", opNames[op]);
079:                }
080:                return vset;
081:            }
082:
083:            /**
084:             * Check if constant
085:             */
086:            public boolean isConstant() {
087:                switch (op) {
088:                case POS:
089:                case NEG:
090:                case BITNOT:
091:                case NOT:
092:                case EXPR:
093:                case CONVERT: // generated inside of CastExpression
094:                    return right.isConstant();
095:                }
096:                return false;
097:            }
098:
099:            /**
100:             * Evaluate
101:             */
102:            Expression eval(int a) {
103:                return this ;
104:            }
105:
106:            Expression eval(long a) {
107:                return this ;
108:            }
109:
110:            Expression eval(float a) {
111:                return this ;
112:            }
113:
114:            Expression eval(double a) {
115:                return this ;
116:            }
117:
118:            Expression eval(boolean a) {
119:                return this ;
120:            }
121:
122:            Expression eval(String a) {
123:                return this ;
124:            }
125:
126:            Expression eval() {
127:                switch (right.op) {
128:                case BYTEVAL:
129:                case CHARVAL:
130:                case SHORTVAL:
131:                case INTVAL:
132:                    return eval(((IntegerExpression) right).value);
133:                case LONGVAL:
134:                    return eval(((LongExpression) right).value);
135:                case FLOATVAL:
136:                    return eval(((FloatExpression) right).value);
137:                case DOUBLEVAL:
138:                    return eval(((DoubleExpression) right).value);
139:                case BOOLEANVAL:
140:                    return eval(((BooleanExpression) right).value);
141:                case STRINGVAL:
142:                    return eval(((StringExpression) right).value);
143:                }
144:                return this ;
145:            }
146:
147:            /**
148:             * Inline
149:             */
150:            public Expression inline(Environment env, Context ctx) {
151:                return right.inline(env, ctx);
152:            }
153:
154:            public Expression inlineValue(Environment env, Context ctx) {
155:                right = right.inlineValue(env, ctx);
156:                try {
157:                    return eval().simplify();
158:                } catch (ArithmeticException e) {
159:                    // Got rid of this error message.  It isn't illegal to
160:                    // have a program which does a constant division by
161:                    // zero.  We return `this' to make the compiler to
162:                    // generate code here.
163:                    // (bugs 4019304, 4089107).
164:                    //
165:                    // I am not positive that this catch is ever reached.
166:                    //
167:                    // env.error(where, "arithmetic.exception");
168:                    return this ;
169:                }
170:            }
171:
172:            /**
173:             * Create a copy of the expression for method inlining
174:             */
175:            public Expression copyInline(Context ctx) {
176:                UnaryExpression e = (UnaryExpression) clone();
177:                if (right != null) {
178:                    e.right = right.copyInline(ctx);
179:                }
180:                return e;
181:            }
182:
183:            /**
184:             * The cost of inlining this expression
185:             */
186:            public int costInline(int thresh, Environment env, Context ctx) {
187:                return 1 + right.costInline(thresh, env, ctx);
188:            }
189:
190:            /**
191:             * Print
192:             */
193:            public void print(PrintStream out) {
194:                out.print("(" + opNames[op] + " ");
195:                right.print(out);
196:                out.print(")");
197:            }
198:        }
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