JSTests/wasm/js-api/call-indirect.js

import * as assert from '../assert.js';
import Builder from '../Builder.js';

const wasmModuleWhichImportJS = () => {
    const builder = (new Builder())
        .Type().End()
        .Import()
            .Function("imp", "func", { params: ["i32"] })
            .Table("imp", "table", { initial: 1, maximum: 1, element: "anyfunc"})
        .End()
        .Function().End()
        .Export()
            .Function("changeCounter")
            .Function("callFunc")
        .End()
        .Code()
            .Function("changeCounter", { params: ["i32", "i32"] })
                .I32Const(42)
                .GetLocal(0)
                .I32Add()
                .GetLocal(1)
                .CallIndirect(0, 0) // Calls table[0](param[0] + 42).
            .End()
            .Function("callFunc", { params: ["i32"] })
                .GetLocal(0)
                .Call(0) // Calls func(param[0] + 42)
            .End()
        .End();
    const bin = builder.WebAssembly().get();
    const module = new WebAssembly.Module(bin);
    return module;
};

const makeTable = () => {
    return new WebAssembly.Table({initial: 1, maximum: 1, element: "anyfunc"});
};

(function MonomorphicImport() {
    let counter = 0;
    const counterSetter = v => counter = v;
    const table = makeTable();
    const module = wasmModuleWhichImportJS();
    const instance = new WebAssembly.Instance(module, { imp: { func: counterSetter, table} });
    table.set(0, instance.exports.callFunc);
    for (let i = 0; i < 4096; ++i) {
        // Invoke this a bunch of times to make sure the IC in the wasm -> JS stub works correctly.
        instance.exports.changeCounter(i, 0);
        assert.eq(counter, i + 42);
    }
})();

(function Polyphic2Import() {
    let counterA = 0;
    let counterB = undefined;
    const counterASetter = v => counterA = v;
    const counterBSetter = v => counterB = { valueB: v };
    const module = wasmModuleWhichImportJS();

    const tableA = makeTable();
    const instanceA = new WebAssembly.Instance(module, { imp: { func: counterASetter, table: tableA} });
    tableA.set(0, instanceA.exports.callFunc);

    const tableB = makeTable();
    const instanceB = new WebAssembly.Instance(module, { imp: { func: counterBSetter, table: tableB} });
    tableB.set(0, instanceB.exports.callFunc);
    for (let i = 0; i < 2048; ++i) {
        instanceA.exports.changeCounter(i, 0);
        assert.isA(counterA, "number");
        assert.eq(counterA, i + 42);
        instanceB.exports.changeCounter(i, 0);
        assert.isA(counterB, "object");
        assert.eq(counterB.valueB, i + 42);
    }
})();

(function VirtualImport() {
    const counterSetters = [
        v => counters[0] = v,
        v => counters[1] = v + 1,
        v => counters[2] = v + 2,
        v => counters[3] = v + 3,
        v => counters[4] = v + 4,
        v => counters[5] = v + 5,
        v => counters[6] = v + 6,
        v => counters[7] = v + 7,
        v => counters[8] = v + 8,
        v => counters[9] = v + 9,
    ];
    const num = counterSetters.length;
    let counters = counterSetters.map(() => 0);
    assert.eq(counters.length, num);
    const module = wasmModuleWhichImportJS();
    let instances = [];
    for (let i = 0; i < num; ++i) {
        let table = makeTable();
        instances[i] = new WebAssembly.Instance(module, { imp: { func: counterSetters[i], table} });
        table.set(0, instances[i].exports.callFunc);
    }
    for (let i = 0; i < 2048; ++i) {
        for (let j = 0; j < num; ++j) {
            instances[j].exports.changeCounter(i, 0);
            assert.isA(counters[j], "number");
            assert.eq(counters[j], i + 42 + j);
        }
    }
})();