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webassembly/objpyproxy: Avoid throwing on implicit symbols access. #17683

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Merged
merged 1 commit into from
Jul 17, 2025
Merged

webassembly/objpyproxy: Avoid throwing on implicit symbols access. #17683

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53 changes: 27 additions & 26 deletions ports/webassembly/objpyproxy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -165,34 +165,35 @@ const py_proxy_handler = {
if (prop === "_ref") {
return target._ref;
}
if (prop === "then") {
return null;
}

if (prop === Symbol.iterator) {
// Get the Python object iterator, and return a JavaScript generator.
const iter_ref = Module.ccall(
"proxy_c_to_js_get_iter",
"number",
["number"],
[target._ref],
);
return function* () {
const value = Module._malloc(3 * 4);
while (true) {
const valid = Module.ccall(
"proxy_c_to_js_iternext",
"number",
["number", "pointer"],
[iter_ref, value],
);
if (!valid) {
break;
// ignore both then and all symbols but Symbol.iterator
if (prop === "then" || typeof prop !== "string") {
if (prop === Symbol.iterator) {
// Get the Python object iterator, and return a JavaScript generator.
const iter_ref = Module.ccall(
"proxy_c_to_js_get_iter",
"number",
["number"],
[target._ref],
);
return function* () {
const value = Module._malloc(3 * 4);
while (true) {
const valid = Module.ccall(
"proxy_c_to_js_iternext",
"number",
["number", "pointer"],
[iter_ref, value],
);
if (!valid) {
break;
}
yield proxy_convert_mp_to_js_obj_jsside(value);
}
yield proxy_convert_mp_to_js_obj_jsside(value);
}
Module._free(value);
};
Module._free(value);
};
}
return undefined;
}

const value = Module._malloc(3 * 4);
Expand Down
14 changes: 14 additions & 0 deletions tests/ports/webassembly/py_proxy_get.mjs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
// Test `<py-obj> get <attr>` on the JavaScript side, which tests PyProxy.get.

const mp = await (await import(process.argv[2])).loadMicroPython();

mp.runPython(`
x = {"a": 1}
`);

const x = mp.globals.get("x");
console.log(x.a === 1);
console.log(x.b === undefined);
console.log(typeof x[Symbol.iterator] === "function");
console.log(x[Symbol.toStringTag] === undefined);
console.log(x.then === undefined);
5 changes: 5 additions & 0 deletions tests/ports/webassembly/py_proxy_get.mjs.exp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
true
true
true
true
true
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