externref-global-object.js

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// |jit-test| skip-if: typeof WebAssembly.Global !== 'function'

// Dummy object.

function Baguette(calories) {

    this.calories = calories;

assertEq(new WebAssembly.Global({value: "externref"}) instanceof WebAssembly.Global, true);

(function() {

    // Test initialization without a value.

    let g = new WebAssembly.Global({value: "externref"});

    assertEq(g.value, void 0);

    assertErrorMessage(() => g.value = 42, TypeError, /immutable global/);

})();

(function() {

    // Test initialization with a value.

    let g = new WebAssembly.Global({value: "externref"}, null);

    assertEq(g.value, null);

    assertErrorMessage(() => g.value = 42, TypeError, /immutable global/);

    let obj = {};

    g = new WebAssembly.Global({value: "externref"}, obj);

    assertEq(g.value, obj);

    assertErrorMessage(() => g.value = 42, TypeError, /immutable global/);

    g = new WebAssembly.Global({value: "externref"}, 1337);

    assertEq(typeof g.value, "number");

    assertEq(+g.value, 1337);

    g = new WebAssembly.Global({value: "externref"}, 13.37);

    assertEq(typeof g.value, "number");

    assertEq(+g.value, 13.37);

    g = new WebAssembly.Global({value: "externref"}, "string");

    assertEq(typeof g.value, "string");

    assertEq(g.value.toString(), "string");

    g = new WebAssembly.Global({value: "externref"}, true);

    assertEq(typeof g.value, "boolean");

    assertEq(!!g.value, true);

    g = new WebAssembly.Global({value: "externref"}, Symbol("status"));

    assertEq(typeof g.value, "symbol");

    assertEq(g.value.toString(), "Symbol(status)");

    g = new WebAssembly.Global({value: "externref"}, undefined);

    assertEq(g.value, undefined);

})();

(function() {

    // Test mutable property and assignment.

    let g = new WebAssembly.Global({value: "externref", mutable: true}, null);

    assertEq(g.value, null);

    let obj = { x: 42 };

    g.value = obj;

    assertEq(g.value, obj);

    assertEq(g.value.x, 42);

    obj = null;

    assertEq(g.value.x, 42);

    let otherObj = { y : 35 };

    g.value = otherObj;

    assertEq(g.value, otherObj);

})();

(function() {

    // Test tracing.

    let nom = new Baguette(1);

    let g = new WebAssembly.Global({value: "externref"}, nom);

    nom = null;

    gc();

    assertEq(g.value.calories, 1);

})();

var global = new WebAssembly.Global({ value: "externref", mutable: true }, null);

// GCZeal mode 2 implies that every allocation (second parameter = every single

// allocation) will trigger a full GC.

gczeal(2, 1);

    let nomnom = new Baguette(42);

    global.value = nomnom;

    nomnom = null;

new Baguette();

assertEq(global.value.calories, 42);