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 BitNotExpression extends UnaryExpression {
37: /**
38: * Constructor
39: */
40: public BitNotExpression(long where, Expression right) {
41: super (BITNOT, 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_LONG) != 0) {
49: type = Type.tLong;
50: } else {
51: type = Type.tInt;
52: }
53: right = convert(env, ctx, type, right);
54: }
55:
56: /**
57: * Evaluate
58: */
59: Expression eval(int a) {
60: return new IntExpression(where, ~a);
61: }
62:
63: Expression eval(long a) {
64: return new LongExpression(where, ~a);
65: }
66:
67: /**
68: * Simplify
69: */
70: Expression simplify() {
71: if (right.op == BITNOT) {
72: return ((BitNotExpression) right).right;
73: }
74: return this ;
75: }
76:
77: /**
78: * Code
79: */
80: public void codeValue(Environment env, Context ctx, Assembler asm) {
81: right.codeValue(env, ctx, asm);
82: if (type.isType(TC_INT)) {
83: asm.add(where, opc_ldc, new Integer(-1));
84: asm.add(where, opc_ixor);
85: } else {
86: asm.add(where, opc_ldc2_w, new Long(-1));
87: asm.add(where, opc_lxor);
88: }
89: }
90: }
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