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LibWasm: Use correct null check when getting iterator method
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This commit is contained in:
Tim Ledbetter 2025-07-13 09:33:48 +01:00 • committed by Jelle Raaijmakers
commit cd0cadc5e1
Notes: github-actions[bot] 2025-07-13 09:29:23 +00:00
4 changed files with 175 additions and 1 deletions
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2
Libraries/LibWeb/WebAssembly/WebAssembly.cpp
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@ -291,7 +291,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<Wasm::ModuleInstance>> instantiate_module(JS
return Wasm::Result { Vector<Wasm::Value> { TRY_OR_RETURN_TRAP(to_webassembly_value(vm, result, type.results().first())) } };
auto method = TRY_OR_RETURN_TRAP(result.get_method(vm, vm.names.iterator));
if (method == JS::js_undefined())
if (!method)
return Wasm::Trap::from_external_object(vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, result.to_string_without_side_effects()));
auto values = TRY_OR_RETURN_TRAP(JS::iterator_to_list(vm, TRY_OR_RETURN_TRAP(JS::get_iterator_from_method(vm, result, *method))));

9
Tests/LibWeb/Text/expected/wpt-import/wasm/jsapi/constructor/multi-value.any.txt Normal file
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@ -0,0 +1,9 @@
Harness status: OK
Found 3 tests
1 Pass
2 Fail
Fail multiple return values from wasm to js
Pass multiple return values inside wasm
Fail multiple return values from js to wasm

16
Tests/LibWeb/Text/input/wpt-import/wasm/jsapi/constructor/multi-value.any.html Normal file
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@ -0,0 +1,16 @@
<!doctype html>
<meta charset=utf-8>
<script>
self.GLOBAL = {
isWindow: function() { return true; },
isWorker: function() { return false; },
isShadowRealm: function() { return false; },
};
</script>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../wasm/jsapi/wasm-module-builder.js"></script>
<script src="../../../wasm/jsapi/assertions.js"></script>
<div id=log></div>
<script src="../../../wasm/jsapi/constructor/multi-value.any.js"></script>

149
Tests/LibWeb/Text/input/wpt-import/wasm/jsapi/constructor/multi-value.any.js Normal file
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@ -0,0 +1,149 @@
// META: global=window,dedicatedworker,jsshell,shadowrealm
// META: script=/wasm/jsapi/wasm-module-builder.js
// META: script=/wasm/jsapi/assertions.js
const type_if_fi = makeSig([kWasmF64, kWasmI32], [kWasmI32, kWasmF64]);
promise_test(async () => {
const builder = new WasmModuleBuilder();
builder
.addFunction("swap", type_if_fi)
.addBody([
kExprLocalGet, 1,
kExprLocalGet, 0,
kExprReturn,
])
.exportFunc();
const buffer = builder.toBuffer();
const result = await WebAssembly.instantiate(buffer);
const swapped = result.instance.exports.swap(4.2, 7);
assert_true(Array.isArray(swapped));
assert_equals(Object.getPrototypeOf(swapped), Array.prototype);
assert_array_equals(swapped, [7, 4.2]);
}, "multiple return values from wasm to js");
promise_test(async () => {
const builder = new WasmModuleBuilder();
const swap = builder
.addFunction("swap", type_if_fi)
.addBody([
kExprLocalGet, 1,
kExprLocalGet, 0,
kExprReturn,
]);
builder
.addFunction("callswap", kSig_i_v)
.addBody([
...wasmF64Const(4.2),
...wasmI32Const(7),
kExprCallFunction, swap.index,
kExprDrop,
kExprReturn,
])
.exportFunc();
const buffer = builder.toBuffer();
const result = await WebAssembly.instantiate(buffer);
const swapped = result.instance.exports.callswap();
assert_equals(swapped, 7);
}, "multiple return values inside wasm");
promise_test(async () => {
const builder = new WasmModuleBuilder();
const fnIndex = builder.addImport("module", "fn", type_if_fi);
builder
.addFunction("callfn", kSig_i_v)
.addBody([
...wasmF64Const(4.2),
...wasmI32Const(7),
kExprCallFunction, fnIndex,
kExprDrop,
kExprReturn,
])
.exportFunc();
const buffer = builder.toBuffer();
const actual = [];
const imports = {
"module": {
fn(f32, i32) {
assert_equals(f32, 4.2);
assert_equals(i32, 7);
const result = [2, 7.3];
let i = 0;
return {
get [Symbol.iterator]() {
actual.push("@@iterator getter");
return function iterator() {
actual.push("@@iterator call");
return {
get next() {
actual.push("next getter");
return function next(...args) {
assert_array_equals(args, []);
let j = ++i;
actual.push(`next call ${j}`);
if (j > result.length) {
return {
get done() {
actual.push(`done call ${j}`);
return true;
}
};
}
return {
get done() {
actual.push(`done call ${j}`);
return false;
},
get value() {
actual.push(`value call ${j}`);
return {
get valueOf() {
actual.push(`valueOf get ${j}`);
return function() {
actual.push(`valueOf call ${j}`);
return result[j - 1];
};
}
};
}
};
};
}
};
}
},
};
},
}
};
const { instance } = await WebAssembly.instantiate(buffer, imports);
const result = instance.exports.callfn();
assert_equals(result, 2);
assert_array_equals(actual, [
"@@iterator getter",
"@@iterator call",
"next getter",
"next call 1",
"done call 1",
"value call 1",
"next call 2",
"done call 2",
"value call 2",
"next call 3",
"done call 3",
"valueOf get 1",
"valueOf call 1",
"valueOf get 2",
"valueOf call 2",
]);
}, "multiple return values from js to wasm");