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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.vm4brwsr;
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final class NumberOperations {
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private static final int DIV32 = 1;
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private static final int MOD32 = 2;
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private static final int MUL32 = 4;
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private static final int BIT64 = 8;
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private int used;
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public void reset() {
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used = 0;
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}
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public String mul32() {
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used |= MUL32;
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return "__mul32(@1,@2)";
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}
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public String div32() {
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used |= DIV32;
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return "__div32(@1,@2)";
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}
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public String mod32() {
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used |= MOD32;
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return "__mod32(@1,@2)";
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}
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public String add64() {
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used |= BIT64;
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return "__add64(@1,@2)";
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}
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public String sub64() {
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used |= BIT64;
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return "__sub64(@1,@2)";
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}
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public String mul64() {
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used |= BIT64;
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return "__mul64(@1,@2)";
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}
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public String div64() {
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used |= BIT64;
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return "__div64(@1,@2)";
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}
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public String mod64() {
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used |= BIT64;
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return "__mod64(@1,@2)";
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}
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public String and64() {
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used |= BIT64;
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return "__and64(@1,@2)";
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}
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public String or64() {
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used |= BIT64;
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return "__or64(@1,@2)";
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}
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public String xor64() {
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used |= BIT64;
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return "__xor64(@1,@2)";
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}
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public String neg64() {
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used |= BIT64;
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return "__neg64(@1)";
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}
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public String shl64() {
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used |= BIT64;
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return "__shl64(@1,@2)";
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}
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public String shr64() {
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used |= BIT64;
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return "__shr64(@1,@2)";
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}
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public String ushr64() {
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used |= BIT64;
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return "__ushr64(@1,@2)";
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}
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public String compare64() {
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used |= BIT64;
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return "__compare64(@2,@1)";
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}
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public String generate() {
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if (used == 0) {
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return "";
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}
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StringBuilder sb = new StringBuilder();
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if ((used & MUL32) != 0) {
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sb.append(
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" __mul32 = function(x, y) {\n" +
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" return (((x * (y >> 16)) << 16) + x * (y & 0xFFFF)) | 0;\n" +
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" };\n" +
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""
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);
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}
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if ((used & (MOD32 | DIV32)) != 0) {
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sb.append(
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" function __handleDivByZero() {\n" +
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" var exception = new vm.java_lang_ArithmeticException;\n" +
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" vm.java_lang_ArithmeticException(false).constructor\n" +
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" .cons__VLjava_lang_String_2.call(exception, \"/ by zero\");\n" +
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"\n" +
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" throw exception;\n" +
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" }\n" +
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""
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);
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}
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if ((used & MOD32) != 0) {
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sb.append(
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" function __mod32(x, y) {\n" +
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" if (y === 0) __handleDivByZero();\n" +
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" return (x % y) | 0;\n" +
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" }\n" +
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""
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);
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}
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if ((used & DIV32) != 0) {
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sb.append(
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" function __div32(x, y) {\n" +
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" if (y === 0) __handleDivByZero();\n" +
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" return (x / y) | 0;\n" +
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" }\n" +
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""
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);
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}
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if ((used & BIT64) != 0) {
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sb.append(
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" var __add64 = Number.prototype['__bit64']['add64'];\n" +
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" var __sub64 = Number.prototype['__bit64']['sub64'];\n" +
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" var __mul64 = Number.prototype['__bit64']['mul64'];\n" +
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" var __div64 = Number.prototype['__bit64']['div64'];\n" +
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" var __mod64 = Number.prototype['__bit64']['mod64'];\n" +
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" var __and64 = Number.prototype['__bit64']['and64'];\n" +
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" var __or64 = Number.prototype['__bit64']['or64'];\n" +
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" var __xor64 = Number.prototype['__bit64']['xor64'];\n" +
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" var __neg64 = Number.prototype['__bit64']['neg64'];\n" +
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" var __shl64 = Number.prototype['__bit64']['shl64'];\n" +
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" var __shr64 = Number.prototype['__bit64']['shr64'];\n" +
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" var __ushr64 = Number.prototype['__bit64']['ushr64'];\n" +
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" var __compare64 = Number.prototype['__bit64']['compare64'];\n" +
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""
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);
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}
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return sb.toString();
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}
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}
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