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Python/emscripten_trampoline_inner.c
38 строк
1 KB
Hood Chatham
gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (#137470)
17 сен 2025, 17:33
Не верифицирован
17 сен 2025, 17:33
2629ee4
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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; }