asm.js使用实例代码

发布时间：2023-08-05 14:30:41 所属栏目：教程来源：

导读：代码如下:

function mymodule(global, foreign, buffer) {

"use asm";

// -------------------------------------------------------------------------

// SECTION 1: imports

代码如下:

function mymodule(global, foreign, buffer) {

    "use asm";

    // -------------------------------------------------------------------------

    // SECTION 1: imports

    var H32 = new global.Int32Array(buffer);

    var HU32 = new global.Uint32Array(buffer);

    var log = foreign.consoleDotLog;

    // -------------------------------------------------------------------------

    // SECTION 2: functions

    function f(x, y, z, w) {

        // SECTION A: parameter type declarations

        x = x|0;      // int parameter

        y = +y;       // double parameter

        // SECTION B: function body

        log(x|0);     // call into FFI -- must force the sign

        log(y);       // call into FFI -- already know it's a double

        x = (x+3)|0; // signed addition

        // SECTION C: unconditional return

        return ((((x+1)|0)>>>0)/(x|0))>>>0; // compound expression

    }

    function g() {

        g_f = +g_i; // read/write globals

        return;

    }

    function g2() {

        return;

    }

    function h(i, x) {

        i = i|0;

        x = x|0;

        H32[(i&0xffffffff)>>4] = x; // masked by 2^k-1, shifted by byte count

        ftable_2[(x-2)&2]();        // dynamic call of functions in table 2

    }

    // -------------------------------------------------------------------------

    // SECTION 3: function tables

    var ftable_1 = [f];

    var ftable_2 = [g, g2]; // all of the same type

    // -------------------------------------------------------------------------

    // SECTION 4: globals

    var g_i = 0;   // int global

    var g_f = 0.0; // double global

    // -------------------------------------------------------------------------

    // SECTION 5: exports

    return { f_export: f, goop: g };

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