cpython/Python/emscripten_trampoline_inner.c at main · python/cpython · GitHub

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// This file must be compiled with -mgc to enable the extra wasm-gc

// instructions. It has to be compiled separately because not enough JS runtimes

// support wasm-gc yet. If the JS runtime does not support wasm-gc (or has buggy

// support like iOS), we will use the JS trampoline fallback.

// We can't import Python.h here because it is compiled/linked with -nostdlib.

// We don't need to know what's inside PyObject* anyways. We could just call it

// void* everywhere. There are two reasons to do this:

// 1. to improve readability

// 2. eventually when we are comfortable requiring wasm-gc, we can merge this

// into emscripten_trampoline.c without worrying about it.

typedef void PyObject;

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

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

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

typedef PyObject* (*zero_arg)(void);

#define TRY_RETURN_CALL(ty, args...) \

if (__builtin_wasm_test_function_pointer_signature((ty)func)) { \

return ((ty)func)(args); \

}

__attribute__((export_name("trampoline_call"))) PyObject*

trampoline_call(int* success,

void* func,

PyObject* self,

PyObject* args,

PyObject* kw)

{

*success = 1;

TRY_RETURN_CALL(three_arg, self, args, kw);

TRY_RETURN_CALL(two_arg, self, args);

TRY_RETURN_CALL(one_arg, self);

TRY_RETURN_CALL(zero_arg);

*success = 0;

return 0;

}

cpython/Python/emscripten_trampoline_inner.c at main · python/cpython · GitHub

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