wasm-sourceMappingURL.js

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// |jit-test| test-also=--wasm-compiler=optimizing; skip-if: !wasmDebuggingEnabled()

// Tests that wasm module sourceMappingURL section is parsed.

load(libdir + "asserts.js");

load(libdir + "wasm-binary.js");

var g = newGlobal({newCompartment: true});

var dbg = new Debugger(g);

var gotScript;

dbg.allowWasmBinarySource = true;

dbg.onNewScript = (script) => {

  gotScript = script;

function toU8(array) {

    for (let b of array)

        assertEq(b < 256, true);

    return Uint8Array.from(array);

function varU32(u32) {

    assertEq(u32 >= 0, true);

    assertEq(u32 < Math.pow(2,32), true);

    var bytes = [];

    do {

        var byte = u32 & 0x7f;

        u32 >>>= 7;

        if (u32 != 0)

            byte |= 0x80;

        bytes.push(byte);

    } while (u32 != 0);

    return bytes;

function string(name) {

    var nameBytes = name.split('').map(c => {

        var code = c.charCodeAt(0);

        assertEq(code < 128, true); // TODO

        return code;

});

    return varU32(nameBytes.length).concat(nameBytes);

function appendSourceMappingURL(wasmBytes, url) {

    if (!url)

        return wasmBytes;

    var payload = [...string('sourceMappingURL'), ...string(url)];

    return Uint8Array.from([...wasmBytes, userDefinedId, payload.length, ...payload]);

g.toWasm = (wast, url) => appendSourceMappingURL(wasmTextToBinary(wast), url);

// The sourceMappingURL section is not present

g.eval(`o = new WebAssembly.Instance(new WebAssembly.Module(toWasm('(module (func) (export "" (func 0)))')));`);

assertEq(gotScript.format, "wasm");

assertEq(gotScript.source.sourceMapURL, null);

// The sourceMappingURL section is present

g.eval(`o = new WebAssembly.Instance(new WebAssembly.Module(toWasm('(module (func) (export "a" (func 0)))', 'http://example.org/test')));`);

assertEq(gotScript.format, "wasm");

assertEq(gotScript.source.sourceMapURL, 'http://example.org/test');

// The sourceMapURL is read-only for wasm

assertThrowsInstanceOf(() => gotScript.source.sourceMapURL = 'foo', Error);

// The sourceMappingURL section is present, and is still available when wasm

// binary source is disabled.

dbg.allowWasmBinarySource = false;

g.eval(`o = new WebAssembly.Instance(new WebAssembly.Module(toWasm('(module (func) (export "a" (func 0)))', 'http://example.org/test2')));`);

assertEq(gotScript.format, "wasm");

assertEq(gotScript.source.sourceMapURL, 'http://example.org/test2');