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 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
  37 class BitNotExpression extends UnaryExpression {
  38     /**
  39      * Constructor
  40      */
  41     public BitNotExpression(long where, Expression right) {
  42         super(BITNOT, where, right.type, right);
  43     }
  44 
  45     /**
  46      * Select the type of the expression
  47      */
  48     void selectType(Environment env, Context ctx, int tm) {
  49         if ((tm & TM_LONG) != 0) {
  50             type = Type.tLong;
  51         } else {
  52             type = Type.tInt;
  53         }
  54         right = convert(env, ctx, type, right);
  55     }
  56 
  57     /**
  58      * Evaluate
  59      */
  60     Expression eval(int a) {
  61         return new IntExpression(where, ~a);
  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 }