LuaJIT modifications needed to re-enable custom 64-bit allocators.

luajit-64bit-custom-allocators.diff

diff --git a/src/lib_aux.c b/src/lib_aux.c
index 05fa6b1..c618094 100644
--- a/src/lib_aux.c
+++ b/src/lib_aux.c
@@ -346,9 +346,11 @@ LUALIB_API lua_State *luaL_newstate(void)
 #if LJ_64
 LUA_API lua_State *lua_newstate(lua_Alloc f, void *ud)
 {
-  UNUSED(f); UNUSED(ud);
-  fputs("Must use luaL_newstate() for 64 bit target\n", stderr);
-  return NULL;
+  /* Re-enable custom 64-bit allocators */
+  lua_State *L;
+  L = lj_state_newstate(f, ud);
+  if (L) G(L)->panic = panic;
+  return L;
 }
 #endif
 

Old gist, I know - but I don't quite understand why they're using signed memory offsets. I understand that using signed types gives you trapability whereas unsigned will silently overflow, but that's a poor reason to use signed types for memory offsets, especially when it cuts out a widely used architecture.

Further, the mmap implementation they provide simply does not work on the three machines I tried it on. I have no idea how they got it to work elsewhere. It receives a failure code from the call to mmap() and it doesn't specify why it fails.