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#if defined(PY_CALL_TRAMPOLINE)
#include <emscripten.h> // EM_JS, EM_JS_DEPS
#include <Python.h>
EM_JS(
PyObject*,
_PyEM_TrampolineCall_inner, (int* success,
PyCFunctionWithKeywords func,
PyObject *arg1,
PyObject *arg2,
PyObject *arg3), {
// JavaScript fallback trampoline
return wasmTable.get(func)(arg1, arg2, arg3);
}
// Try to replace the JS definition of _PyEM_TrampolineCall_inner with a wasm
// version.
(function () {
// Starting with iOS 18.3.1, WebKit on iOS has an issue with the garbage
// collector that breaks the call trampoline. See #130418 and
// https://bugs.webkit.org/show_bug.cgi?id=293113 for details.
let isIOS = globalThis.navigator && (
/iPad|iPhone|iPod/.test(navigator.userAgent) ||
// Starting with iPadOS 13, iPads might send a platform string that looks like a desktop Mac.
// To differentiate, we check if the platform is 'MacIntel' (common for Macs and newer iPads)
// AND if the device has multi-touch capabilities (navigator.maxTouchPoints > 1)
(navigator.platform === 'MacIntel' && typeof navigator.maxTouchPoints !== 'undefined' && navigator.maxTouchPoints > 1)
);
if (isIOS) {
return;
}
try {
const trampolineModule = getWasmTrampolineModule();
const trampolineInstance = new WebAssembly.Instance(trampolineModule, {
env: { __indirect_function_table: wasmTable, memory: wasmMemory },
});
_PyEM_TrampolineCall_inner = trampolineInstance.exports.trampoline_call;
} catch (e) {
// Compilation error due to missing wasm-gc support, fall back to JS
// trampoline
}
})();
);
PyObject*
_PyEM_TrampolineCall(PyCFunctionWithKeywords func,
PyObject* self,
PyObject* args,
PyObject* kw)
{
int success = 1;
PyObject *result = _PyEM_TrampolineCall_inner(&success, func, self, args, kw);
if (!success) {
PyErr_SetString(PyExc_SystemError, "Handler takes too many arguments");
}
return result;
}
#endif
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