godot/modules/mono/mono_gd/gd_mono_wasm_m2n.cpp

/*************************************************************************/
/*  gd_mono_wasm_m2n.cpp                                                 */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#include "gd_mono_wasm_m2n.h"

#ifdef JAVASCRIPT_ENABLED

#include "core/templates/oa_hash_map.h"

typedef mono_bool (*GodotMonoM2nIcallTrampolineDispatch)(const char *cookie, void *target_func, Mono_InterpMethodArguments *margs);

// This extern function is implemented in our patched version of Mono
MONO_API void godot_mono_register_m2n_icall_trampoline_dispatch_hook(GodotMonoM2nIcallTrampolineDispatch hook);

namespace GDMonoWasmM2n {

struct HashMapCookieComparator {
	static bool compare(const char *p_lhs, const char *p_rhs) {
		return strcmp(p_lhs, p_rhs) == 0;
	}
};

// The default hasher supports 'const char *' C Strings, but we need a custom comparator
OAHashMap<const char *, TrampolineFunc, HashMapHasherDefault, HashMapCookieComparator> trampolines;

void set_trampoline(const char *cookies, GDMonoWasmM2n::TrampolineFunc trampoline_func) {
	trampolines.set(cookies, trampoline_func);
}

mono_bool trampoline_dispatch_hook(const char *cookie, void *target_func, Mono_InterpMethodArguments *margs) {
	TrampolineFunc *trampoline_func = trampolines.lookup_ptr(cookie);

	if (!trampoline_func) {
		return false;
	}

	(*trampoline_func)(target_func, margs);
	return true;
}

bool initialized = false;

void lazy_initialize() {
	// Doesn't need to be thread safe
	if (!initialized) {
		initialized = true;
		godot_mono_register_m2n_icall_trampoline_dispatch_hook(&trampoline_dispatch_hook);
	}
}
} // namespace GDMonoWasmM2n

#endif