Add Data:getFFIPointer. Similar to Data:getPointer but returns a cdata pointer directly (or nil if the FFI isn't available).

It should be preferred instead of Data:getPointer because the latter uses lightuserdata which can't store more all possible memory addresses on some new arm64 architectures, when LuaJIT is used.

src/modules/data/wrap_Data.lua

@@ -0,0 +1,55 @@
+R"luastring"--(
+-- DO NOT REMOVE THE ABOVE LINE. It is used to load this file as a C++ string.
+-- There is a matching delimiter at the bottom of the file.
+
+--[[
+Copyright (c) 2006-2019 LOVE Development Team
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+--]]
+
+local Data_mt, ffifuncspointer_str = ...
+local Data = Data_mt.__index
+
+local type, error = type, error
+
+if type(jit) ~= "table" then return end
+
+local status, ffi = pcall(require, "ffi")
+if not status then return end
+
+pcall(ffi.cdef, [[
+typedef struct Proxy Proxy;
+
+typedef struct FFI_Data
+{
+	void *(*getFFIPointer)(Proxy *p);
+} FFI_Data;
+]])
+
+local ffifuncs = ffi.cast("const FFI_Data **", ffifuncspointer_str)[0]
+
+-- Overwrite placeholder method with the FFI implementation.
+
+function Data:getFFIPointer()
+	-- TODO: This should ideally be handled inside the C function
+	if self == nil then error("bad argument #1 to 'getFFIPointer' (Data expected, got no value)", 2) end
+	return ffifuncs.getFFIPointer(self)
+end
+
+-- DO NOT REMOVE THE NEXT LINE. It is used to load this file as a C++ string.
+--)luastring"--"