// META: global=window,dedicatedworker,jsshell,shadowrealm
// META: script=/wasm/jsapi/assertions.js
// META: script=/wasm/jsapi/wasm-module-builder.js
// META: script=/wasm/jsapi/js-string/polyfill.js
// Generate two sets of exports, one from a polyfill implementation and another
// from the builtins provided by the host.
let polyfillExports;
let builtinExports;
setup(() => {
// Compile a module that exports a function for each builtin that will call
// it. We could just generate a module that re-exports the builtins, but that
// would not catch any special codegen that could happen when direct calling
// a known builtin function from wasm.
const builder = new WasmModuleBuilder();
const arrayIndex = builder.addArray(kWasmI16, true, kNoSuperType, true);
const builtins = [
{
name: "test",
params: [kWasmExternRef],
results: [kWasmI32],
},
{
name: "cast",
params: [kWasmExternRef],
results: [wasmRefType(kWasmExternRef)],
},
{
name: "fromCharCodeArray",
params: [wasmRefNullType(arrayIndex), kWasmI32, kWasmI32],
results: [wasmRefType(kWasmExternRef)],
},
{
name: "intoCharCodeArray",
params: [kWasmExternRef, wasmRefNullType(arrayIndex), kWasmI32],
results: [kWasmI32],
},
{
name: "fromCharCode",
params: [kWasmI32],
results: [wasmRefType(kWasmExternRef)],
},
{
name: "fromCodePoint",
params: [kWasmI32],
results: [wasmRefType(kWasmExternRef)],
},
{
name: "charCodeAt",
params: [kWasmExternRef, kWasmI32],
results: [kWasmI32],
},
{
name: "codePointAt",
params: [kWasmExternRef, kWasmI32],
results: [kWasmI32],
},
{
name: "length",
params: [kWasmExternRef],
results: [kWasmI32],
},
{
name: "concat",
params: [kWasmExternRef, kWasmExternRef],
results: [wasmRefType(kWasmExternRef)],
},
{
name: "substring",
params: [kWasmExternRef, kWasmI32, kWasmI32],
results: [wasmRefType(kWasmExternRef)],
},
{
name: "equals",
params: [kWasmExternRef, kWasmExternRef],
results: [kWasmI32],
},
{
name: "compare",
params: [kWasmExternRef, kWasmExternRef],
results: [kWasmI32],
},
];
// Add a function type for each builtin
for (let builtin of builtins) {
builtin.type = builder.addType({
params: builtin.params,
results: builtin.results
});
}
// Add an import for each builtin
for (let builtin of builtins) {
builtin.importFuncIndex = builder.addImport(
"wasm:js-string",
builtin.name,
builtin.type);
}
// Generate an exported function to call the builtin
for (let builtin of builtins) {
let func = builder.addFunction(builtin.name + "Imp", builtin.type);
func.addLocals(builtin.params.length);
let body = [];
for (let i = 0; i < builtin.params.length; i++) {
body.push(kExprLocalGet);
body.push(...wasmSignedLeb(i));
}
body.push(kExprCallFunction);
body.push(...wasmSignedLeb(builtin.importFuncIndex));
func.addBody(body);
func.exportAs(builtin.name);
}
const buffer = builder.toBuffer();
// Instantiate this module using the builtins from the host
const builtinModule = new WebAssembly.Module(buffer, {
builtins: ["js-string"]
});
const builtinInstance = new WebAssembly.Instance(builtinModule, {});
builtinExports = builtinInstance.exports;
// Instantiate this module using the polyfill module
const polyfillModule = new WebAssembly.Module(buffer);
const polyfillInstance = new WebAssembly.Instance(polyfillModule, {
"wasm:js-string": polyfillImports
});
polyfillExports = polyfillInstance.exports;
});
// A helper function to assert that the behavior of two functions are the
// same.
function assert_same_behavior(funcA, funcB, ...params) {
let resultA;
let errA = null;
try {
resultA = funcA(...params);
} catch (err) {
errA = err;
}
let resultB;
let errB = null;
try {
resultB = funcB(...params);
} catch (err) {
errB = err;
}
if (errA || errB) {
assert_equals(errA === null, errB === null, errA ? errA.message : errB.message);
assert_equals(Object.getPrototypeOf(errA), Object.getPrototypeOf(errB));
}
assert_equals(resultA, resultB);
if (errA) {
throw errA;
}
return resultA;
}
function assert_throws_if(func, shouldThrow, constructor) {
let error = null;
try {
func();
} catch (e) {
error = e;
}
assert_equals(error !== null, shouldThrow);
if (shouldThrow && error !== null) {
assert_true(error instanceof constructor);
}
}
// Constant values used in the tests below
const testStrings = [
"",
"a",
"1",
"ab",
"hello, world",
"\n",
"☺",
"☺☺",
String.fromCodePoint(0x10000, 0x10001)
];
const testCharCodes = [1, 2, 3, 10, 0x7f, 0xff, 0xfffe, 0xffff];
const testCodePoints = [1, 2, 3, 10, 0x7f, 0xff, 0xfffe, 0xffff, 0x10000, 0x10001];
const testExternRefValues = [
null,
undefined,
true,
false,
{x:1337},
["abracadabra"],
13.37,
-0,
0x7fffffff + 0.1,
-0x7fffffff - 0.1,
0x80000000 + 0.1,
-0x80000000 - 0.1,
0xffffffff + 0.1,
-0xffffffff - 0.1,
Number.EPSILON,
Number.MAX_SAFE_INTEGER,
Number.MIN_SAFE_INTEGER,
Number.MIN_VALUE,
Number.MAX_VALUE,
Number.NaN,
"hi",
37n,
new Number(42),
new Boolean(true),
Symbol("status"),
() => 1337,
];
// Test that `test` and `cast` work on various JS values. Run all the
// other builtins and assert that they also perform equivalent type
// checks.
test(() => {
for (let a of testExternRefValues) {
let isString = assert_same_behavior(
builtinExports['test'],
polyfillExports['test'],
a
);
assert_throws_if(() => assert_same_behavior(
builtinExports['cast'],
polyfillExports['cast'],
a
), !isString, WebAssembly.RuntimeError);
let arrayMutI16 = helperExports.createArrayMutI16(10);
assert_throws_if(() => assert_same_behavior(
builtinExports['intoCharCodeArray'],
polyfillExports['intoCharCodeArray'],
a, arrayMutI16, 0
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['charCodeAt'],
polyfillExports['charCodeAt'],
a, 0
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['codePointAt'],
polyfillExports['codePointAt'],
a, 0
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['length'],
polyfillExports['length'],
a
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['concat'],
polyfillExports['concat'],
a, a
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['substring'],
polyfillExports['substring'],
a, 0, 0
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['equals'],
polyfillExports['equals'],
a, a
), !isString, WebAssembly.RuntimeError);
assert_throws_if(() => assert_same_behavior(
builtinExports['compare'],
polyfillExports['compare'],
a, a
), !isString, WebAssembly.RuntimeError);
}
});
// Test that `fromCharCode` works on various char codes
test(() => {
for (let a of testCharCodes) {
assert_same_behavior(
builtinExports['fromCharCode'],
polyfillExports['fromCharCode'],
a
);
}
});
// Test that `fromCodePoint` works on various code points
test(() => {
for (let a of testCodePoints) {
assert_same_behavior(
builtinExports['fromCodePoint'],
polyfillExports['fromCodePoint'],
a
);
}
});
// Perform tests on various strings
test(() => {
for (let a of testStrings) {
let length = assert_same_behavior(
builtinExports['length'],
polyfillExports['length'],
a
);
for (let i = 0; i < length; i++) {
let charCode = assert_same_behavior(
builtinExports['charCodeAt'],
polyfillExports['charCodeAt'],
a, i
);
}
for (let i = 0; i < length; i++) {
let charCode = assert_same_behavior(
builtinExports['codePointAt'],
polyfillExports['codePointAt'],
a, i
);
}
let arrayMutI16 = helperExports.createArrayMutI16(length);
assert_same_behavior(
builtinExports['intoCharCodeArray'],
polyfillExports['intoCharCodeArray'],
a, arrayMutI16, 0
);
assert_same_behavior(
builtinExports['fromCharCodeArray'],
polyfillExports['fromCharCodeArray'],
arrayMutI16, 0, length
);
for (let i = 0; i < length; i++) {
for (let j = 0; j < length; j++) {
assert_same_behavior(
builtinExports['substring'],
polyfillExports['substring'],
a, i, j
);
}
}
}
});
// Test various binary operations
test(() => {
for (let a of testStrings) {
for (let b of testStrings) {
assert_same_behavior(
builtinExports['concat'],
polyfillExports['concat'],
a, b
);
assert_same_behavior(
builtinExports['equals'],
polyfillExports['equals'],
a, b
);
assert_same_behavior(
builtinExports['compare'],
polyfillExports['compare'],
a, b
);
}
}
});
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