mirror of https://github.com/python/cpython
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
#if defined(PY_CALL_TRAMPOLINE)
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#include <emscripten.h> // EM_JS
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#include <Python.h>
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#include "pycore_runtime.h" // _PyRuntime
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/**
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* This is the GoogleChromeLabs approved way to feature detect type-reflection:
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* https://github.com/GoogleChromeLabs/wasm-feature-detect/blob/main/src/detectors/type-reflection/index.js
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*/
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EM_JS(int, _PyEM_detect_type_reflection, (), {
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return "Function" in WebAssembly;
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});
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void
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_Py_EmscriptenTrampoline_Init(_PyRuntimeState *runtime)
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{
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runtime->wasm_type_reflection_available = _PyEM_detect_type_reflection();
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}
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/**
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* Backwards compatible trampoline works with all JS runtimes
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*/
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EM_JS(PyObject*,
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_PyEM_TrampolineCall_JavaScript, (PyCFunctionWithKeywords func,
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PyObject *arg1,
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PyObject *arg2,
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PyObject *arg3),
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{
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return wasmTable.get(func)(arg1, arg2, arg3);
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}
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);
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/**
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* In runtimes with WebAssembly type reflection, count the number of parameters
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* and cast to the appropriate signature
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*/
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EM_JS(int, _PyEM_CountFuncParams, (PyCFunctionWithKeywords func),
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{
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let n = _PyEM_CountFuncParams.cache.get(func);
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if (n !== undefined) {
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return n;
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}
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n = WebAssembly.Function.type(wasmTable.get(func)).parameters.length;
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_PyEM_CountFuncParams.cache.set(func, n);
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return n;
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}
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_PyEM_CountFuncParams.cache = new Map();
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)
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typedef PyObject* (*zero_arg)(void);
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typedef PyObject* (*one_arg)(PyObject*);
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typedef PyObject* (*two_arg)(PyObject*, PyObject*);
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typedef PyObject* (*three_arg)(PyObject*, PyObject*, PyObject*);
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PyObject*
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_PyEM_TrampolineCall_Reflection(PyCFunctionWithKeywords func,
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PyObject* self,
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PyObject* args,
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PyObject* kw)
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{
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switch (_PyEM_CountFuncParams(func)) {
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case 0:
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return ((zero_arg)func)();
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case 1:
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return ((one_arg)func)(self);
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case 2:
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return ((two_arg)func)(self, args);
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case 3:
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return ((three_arg)func)(self, args, kw);
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default:
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PyErr_SetString(PyExc_SystemError,
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"Handler takes too many arguments");
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return NULL;
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}
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}
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#endif
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