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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.tools.tree; | ||
| 27 | |||
| 28 | import sun.tools.java.*; | ||
| 29 | import java.io.PrintStream; | ||
| 30 | import java.util.Hashtable; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * WARNING: The contents of this source file are not part of any | ||
| 34 | * supported API. Code that depends on them does so at its own risk: | ||
| 35 | * they are subject to change or removal without notice. | ||
| 36 | */ | ||
| 37 | public | ||
| 38 | class UnaryExpression extends Expression { | ||
| 39 | Expression right; | ||
| 40 | |||
| 41 | /** | ||
| 42 | * Constructor | ||
| 43 | */ | ||
| 44 | UnaryExpression(int op, long where, Type type, Expression right) { | ||
| 45 | super(op, where, type); | ||
| 46 | this.right = right; | ||
| 47 | } | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Order the expression based on precedence | ||
| 51 | */ | ||
| 52 | public Expression order() { | ||
| 53 | if (precedence() > right.precedence()) { | ||
| 54 | UnaryExpression e = (UnaryExpression)right; | ||
| 55 | right = e.right; | ||
| 56 | e.right = order(); | ||
| 57 | return e; | ||
| 58 | } | ||
| 59 | return this; | ||
| 60 | } | ||
| 61 | |||
| 62 | /** | ||
| 63 | * Select the type of the expression | ||
| 64 | */ | ||
| 65 | void selectType(Environment env, Context ctx, int tm) { | ||
| 66 | throw new CompilerError("selectType: " + opNames[op]); | ||
| 67 | } | ||
| 68 | |||
| 69 | /** | ||
| 70 | * Check a unary expression | ||
| 71 | */ | ||
| 72 | public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 73 | vset = right.checkValue(env, ctx, vset, exp); | ||
| 74 | |||
| 75 | int tm = right.type.getTypeMask(); | ||
| 76 | selectType(env, ctx, tm); | ||
| 77 | if (((tm & TM_ERROR) == 0) && type.isType(TC_ERROR)) { | ||
| 78 | env.error(where, "invalid.arg", opNames[op]); | ||
| 79 | } | ||
| 80 | return vset; | ||
| 81 | } | ||
| 82 | |||
| 83 | /** | ||
| 84 | * Check if constant | ||
| 85 | */ | ||
| 86 | public boolean isConstant() { | ||
| 87 | switch (op) { | ||
| 88 | case POS: | ||
| 89 | case NEG: | ||
| 90 | case BITNOT: | ||
| 91 | case NOT: | ||
| 92 | case EXPR: | ||
| 93 | case CONVERT: // generated inside of CastExpression | ||
| 94 | return right.isConstant(); | ||
| 95 | } | ||
| 96 | return false; | ||
| 97 | } | ||
| 98 | |||
| 99 | /** | ||
| 100 | * Evaluate | ||
| 101 | */ | ||
| 102 | Expression eval(int a) { | ||
| 103 | return this; | ||
| 104 | } | ||
| 105 | Expression eval(long a) { | ||
| 106 | return this; | ||
| 107 | } | ||
| 108 | Expression eval(float a) { | ||
| 109 | return this; | ||
| 110 | } | ||
| 111 | Expression eval(double a) { | ||
| 112 | return this; | ||
| 113 | } | ||
| 114 | Expression eval(boolean a) { | ||
| 115 | return this; | ||
| 116 | } | ||
| 117 | Expression eval(String a) { | ||
| 118 | return this; | ||
| 119 | } | ||
| 120 | Expression eval() { | ||
| 121 | switch (right.op) { | ||
| 122 | case BYTEVAL: | ||
| 123 | case CHARVAL: | ||
| 124 | case SHORTVAL: | ||
| 125 | case INTVAL: | ||
| 126 | return eval(((IntegerExpression)right).value); | ||
| 127 | case LONGVAL: | ||
| 128 | return eval(((LongExpression)right).value); | ||
| 129 | case FLOATVAL: | ||
| 130 | return eval(((FloatExpression)right).value); | ||
| 131 | case DOUBLEVAL: | ||
| 132 | return eval(((DoubleExpression)right).value); | ||
| 133 | case BOOLEANVAL: | ||
| 134 | return eval(((BooleanExpression)right).value); | ||
| 135 | case STRINGVAL: | ||
| 136 | return eval(((StringExpression)right).value); | ||
| 137 | } | ||
| 138 | return this; | ||
| 139 | } | ||
| 140 | |||
| 141 | /** | ||
| 142 | * Inline | ||
| 143 | */ | ||
| 144 | public Expression inline(Environment env, Context ctx) { | ||
| 145 | return right.inline(env, ctx); | ||
| 146 | } | ||
| 147 | public Expression inlineValue(Environment env, Context ctx) { | ||
| 148 | right = right.inlineValue(env, ctx); | ||
| 149 | try { | ||
| 150 | return eval().simplify(); | ||
| 151 | } catch (ArithmeticException e) { | ||
| 152 | // Got rid of this error message. It isn't illegal to | ||
| 153 | // have a program which does a constant division by | ||
| 154 | // zero. We return `this' to make the compiler to | ||
| 155 | // generate code here. | ||
| 156 | // (bugs 4019304, 4089107). | ||
| 157 | // | ||
| 158 | // I am not positive that this catch is ever reached. | ||
| 159 | // | ||
| 160 | // env.error(where, "arithmetic.exception"); | ||
| 161 | return this; | ||
| 162 | } | ||
| 163 | } | ||
| 164 | |||
| 165 | /** | ||
| 166 | * Create a copy of the expression for method inlining | ||
| 167 | */ | ||
| 168 | public Expression copyInline(Context ctx) { | ||
| 169 | UnaryExpression e = (UnaryExpression)clone(); | ||
| 170 | if (right != null) { | ||
| 171 | e.right = right.copyInline(ctx); | ||
| 172 | } | ||
| 173 | return e; | ||
| 174 | } | ||
| 175 | |||
| 176 | /** | ||
| 177 | * The cost of inlining this expression | ||
| 178 | */ | ||
| 179 | public int costInline(int thresh, Environment env, Context ctx) { | ||
| 180 | return 1 + right.costInline(thresh, env, ctx); | ||
| 181 | } | ||
| 182 | |||
| 183 | /** | ||
| 184 | |||
| 185 | */ | ||
| 186 | public void print(PrintStream out) { | ||
| 187 | out.print("(" + opNames[op] + " "); | ||
| 188 | right.print(out); | ||
| 189 | out.print(")"); | ||
| 190 | } | ||
| 191 | } | ||