01: /*
02: * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.tools.tree;
27:
28: import sun.tools.java.*;
29: import sun.tools.asm.Assembler;
30:
31: /**
32: * WARNING: The contents of this source file are not part of any
33: * supported API. Code that depends on them does so at its own risk:
34: * they are subject to change or removal without notice.
35: */
36: public class NegativeExpression extends UnaryExpression {
37: /**
38: * Constructor
39: */
40: public NegativeExpression(long where, Expression right) {
41: super (NEG, where, right.type, right);
42: }
43:
44: /**
45: * Select the type of the expression
46: */
47: void selectType(Environment env, Context ctx, int tm) {
48: if ((tm & TM_DOUBLE) != 0) {
49: type = Type.tDouble;
50: } else if ((tm & TM_FLOAT) != 0) {
51: type = Type.tFloat;
52: } else if ((tm & TM_LONG) != 0) {
53: type = Type.tLong;
54: } else {
55: type = Type.tInt;
56: }
57: right = convert(env, ctx, type, right);
58: }
59:
60: /**
61: * Evaluate
62: */
63: Expression eval(int a) {
64: return new IntExpression(where, -a);
65: }
66:
67: Expression eval(long a) {
68: return new LongExpression(where, -a);
69: }
70:
71: Expression eval(float a) {
72: return new FloatExpression(where, -a);
73: }
74:
75: Expression eval(double a) {
76: return new DoubleExpression(where, -a);
77: }
78:
79: /**
80: * Simplify
81: */
82: Expression simplify() {
83: if (right.op == NEG) {
84: return ((NegativeExpression) right).right;
85: }
86: return this ;
87: }
88:
89: /**
90: * Code
91: */
92: public void codeValue(Environment env, Context ctx, Assembler asm) {
93: right.codeValue(env, ctx, asm);
94: asm.add(where, opc_ineg + type.getTypeCodeOffset());
95: }
96: }
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