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2629ee4eb0
With https://github.com/llvm/llvm-project/pull/150201 being merged, there is now a better way to generate the Emscripten trampoline, instead of including hand-generated binary WASM content. Requires Emscripten 4.0.12.
38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
// This file must be compiled with -mgc to enable the extra wasm-gc
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// instructions. It has to be compiled separately because not enough JS runtimes
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// support wasm-gc yet. If the JS runtime does not support wasm-gc (or has buggy
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// support like iOS), we will use the JS trampoline fallback.
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// We can't import Python.h here because it is compiled/linked with -nostdlib.
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// We don't need to know what's inside PyObject* anyways. We could just call it
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// void* everywhere. There are two reasons to do this:
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// 1. to improve readability
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// 2. eventually when we are comfortable requiring wasm-gc, we can merge this
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// into emscripten_trampoline.c without worrying about it.
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typedef void PyObject;
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typedef PyObject* (*three_arg)(PyObject*, PyObject*, PyObject*);
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typedef PyObject* (*two_arg)(PyObject*, PyObject*);
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typedef PyObject* (*one_arg)(PyObject*);
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typedef PyObject* (*zero_arg)(void);
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#define TRY_RETURN_CALL(ty, args...) \
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if (__builtin_wasm_test_function_pointer_signature((ty)func)) { \
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return ((ty)func)(args); \
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}
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__attribute__((export_name("trampoline_call"))) PyObject*
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trampoline_call(int* success,
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void* 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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*success = 1;
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TRY_RETURN_CALL(three_arg, self, args, kw);
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TRY_RETURN_CALL(two_arg, self, args);
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TRY_RETURN_CALL(one_arg, self);
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TRY_RETURN_CALL(zero_arg);
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*success = 0;
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return 0;
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}
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