1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/NumberOperations.java	Mon Jan 25 08:14:42 2016 +0100
     1.3 @@ -0,0 +1,86 @@
     1.4 +/**
     1.5 + * Back 2 Browser Bytecode Translator
     1.6 + * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
     1.7 + *
     1.8 + * This program is free software: you can redistribute it and/or modify
     1.9 + * it under the terms of the GNU General Public License as published by
    1.10 + * the Free Software Foundation, version 2 of the License.
    1.11 + *
    1.12 + * This program is distributed in the hope that it will be useful,
    1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.15 + * GNU General Public License for more details.
    1.16 + *
    1.17 + * You should have received a copy of the GNU General Public License
    1.18 + * along with this program. Look for COPYING file in the top folder.
    1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
    1.20 + */
    1.21 +package org.apidesign.vm4brwsr;
    1.22 +
    1.23 +final class NumberOperations {
    1.24 +    private static final int DIV32 = 1;
    1.25 +    private static final int MOD32 = 2;
    1.26 +    private static final int MUL32 = 4;
    1.27 +
    1.28 +    private int used;
    1.29 +
    1.30 +    public String mul32() {
    1.31 +        used |= MUL32;
    1.32 +        return "__mul32(@1,@2)";
    1.33 +    }
    1.34 +    public String div32() {
    1.35 +        used |= DIV32;
    1.36 +        return "__div32(@1,@2)";
    1.37 +    }
    1.38 +
    1.39 +    public String mod32() {
    1.40 +        used |= MOD32;
    1.41 +        return "__mod32(@1,@2)";
    1.42 +    }
    1.43 +
    1.44 +    public String generate() {
    1.45 +        if (used == 0) {
    1.46 +            return "";
    1.47 +        }
    1.48 +        StringBuilder sb = new StringBuilder();
    1.49 +        if ((used & MUL32) != 0) {
    1.50 +            sb.append(
    1.51 +                "    __mul32 = function(x, y) {\n" +
    1.52 +                "        return (((x * (y >> 16)) << 16) + x * (y & 0xFFFF)) | 0;\n" +
    1.53 +                "    };\n" +
    1.54 +                ""
    1.55 +            );
    1.56 +        }
    1.57 +        if ((used & (MOD32 | DIV32)) != 0) {
    1.58 +            sb.append(
    1.59 +                "    function __handleDivByZero() {\n" +
    1.60 +                "        var exception = new vm.java_lang_ArithmeticException;\n" +
    1.61 +                "        vm.java_lang_ArithmeticException(false).constructor\n" +
    1.62 +                "          .cons__VLjava_lang_String_2.call(exception, \"/ by zero\");\n" +
    1.63 +                "\n" +
    1.64 +                "        throw exception;\n" +
    1.65 +                "    }\n" +
    1.66 +                ""
    1.67 +            );
    1.68 +        }
    1.69 +        if ((used & MOD32) != 0) {
    1.70 +            sb.append(
    1.71 +                "    function __mod32(x, y) {\n" +
    1.72 +                "        if (y === 0) __handleDivByZero();\n" +
    1.73 +                "        return (x % y) | 0;\n" +
    1.74 +                "    }\n" +
    1.75 +                ""
    1.76 +            );
    1.77 +        }
    1.78 +        if ((used & DIV32) != 0) {
    1.79 +            sb.append(
    1.80 +                "    function __div32(x, y) {\n" +
    1.81 +                "        if (y === 0) __handleDivByZero();\n" +
    1.82 +                "        return (x / y) | 0;\n" +
    1.83 +                "    }\n" +
    1.84 +                ""
    1.85 +            );
    1.86 +        }
    1.87 +        return sb.toString();
    1.88 +    }
    1.89 +}