initial commit of new primitive layer

src/prim/prim.c

@@ -0,0 +1,18 @@
+/* ----------------------------------------------------------------------------
+Copyright (c) 2018-2023, Microsoft Research, Daan Leijen
+This is free software; you can redistribute it and/or modify it under the
+terms of the MIT license. A copy of the license can be found in the file
+"LICENSE" at the root of this distribution.
+-----------------------------------------------------------------------------*/
+
+// Select the implementation of the primitives
+// depending on the OS.
+
+#if defined(_WIN32)
+#include "prim-windows.c"  // VirtualAlloc (Windows)
+#elif defined(__wasi__)
+#define MI_USE_SBRK
+#include "prim-wasi.h"     // memory-grow or sbrk (Wasm)
+#else
+#include "prim-unix.c"     // mmap() (Linux, macOSX, BSD, Illumnos, Haiku, DragonFly, etc.)
+#endif