cpython/Python/emscripten_trampoline.c at main · https-github-com-nzysoft/cpython · GitHub

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#if defined(PY_CALL_TRAMPOLINE)

#include <emscripten.h> // EM_JS

#include <Python.h>

#include "pycore_runtime.h" // _PyRuntime

/**

* This is the GoogleChromeLabs approved way to feature detect type-reflection:

* https://github.com/GoogleChromeLabs/wasm-feature-detect/blob/main/src/detectors/type-reflection/index.js

EM_JS(int, _PyEM_detect_type_reflection, (), {

return "Function" in WebAssembly;

});

void

_Py_EmscriptenTrampoline_Init(_PyRuntimeState *runtime)

{

runtime->wasm_type_reflection_available = _PyEM_detect_type_reflection();

}

/**

* Backwards compatible trampoline works with all JS runtimes

EM_JS(PyObject*,

_PyEM_TrampolineCall_JavaScript, (PyCFunctionWithKeywords func,

PyObject *arg1,

PyObject *arg2,

PyObject *arg3),

{

return wasmTable.get(func)(arg1, arg2, arg3);

}

);

/**

* In runtimes with WebAssembly type reflection, count the number of parameters

* and cast to the appropriate signature

EM_JS(int, _PyEM_CountFuncParams, (PyCFunctionWithKeywords func),

{

let n = _PyEM_CountFuncParams.cache.get(func);

if (n !== undefined) {

return n;

}

n = WebAssembly.Function.type(wasmTable.get(func)).parameters.length;

_PyEM_CountFuncParams.cache.set(func, n);

return n;

}

_PyEM_CountFuncParams.cache = new Map();

)

typedef PyObject* (*zero_arg)(void);

typedef PyObject* (*one_arg)(PyObject*);

typedef PyObject* (*two_arg)(PyObject*, PyObject*);

typedef PyObject* (*three_arg)(PyObject*, PyObject*, PyObject*);

PyObject*

_PyEM_TrampolineCall_Reflection(PyCFunctionWithKeywords func,

PyObject* self,

PyObject* args,

PyObject* kw)

{

switch (_PyEM_CountFuncParams(func)) {

case 0:

return ((zero_arg)func)();

case 1:

return ((one_arg)func)(self);

case 2:

return ((two_arg)func)(self, args);

case 3:

return ((three_arg)func)(self, args, kw);

default:

PyErr_SetString(PyExc_SystemError,

"Handler takes too many arguments");

return NULL;

}

#endif

cpython/Python/emscripten_trampoline.c at main · https-github-com-nzysoft/cpython · GitHub

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