Add C function u64_to_num

.gitignore

@@ -1,2 +1,2 @@
 *.luo
-lunaclib/lunaclib.so
+lunaclib.so

lunaclib.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <lua.h>
+#include <lauxlib.h>
+
+static int u64_to_num(lua_State* L) {
+    #ifndef LUA_NUMBER_DOUBLE
+    #error Lua must be compiled with number as a double floating point
+    #endif
+
+    const uint64_t h1 = luaL_checkint(L, 1);
+    const uint64_t h2 = luaL_checkint(L, 2);
+
+    const uint64_t stacked = (h2 << 32) | h1;
+
+    double res = *(double *)((char *)&stacked);
+    lua_pushnumber(L, res);
+
+    return 1;
+}
+
+static const struct luaL_Reg lib[] = {
+    {"u64_to_num", u64_to_num},
+    {NULL, NULL}
+};
+
+int luaopen_lunaclib(lua_State *L) {
+    luaL_openlib(L, "lunaclib", lib, 0);
+    return 1;
+}
+

lunaclib/lunaclib.c

@@ -1,19 +0,0 @@
-#include <stdio.h>
-#include <lua.h>
-#include <lauxlib.h>
-
-static int hello(lua_State* L) {
-    puts("Hello World!");
-    return 0;
-}
-
-static const struct luaL_Reg lib[] = {
-    {"hello", hello},
-    {NULL, NULL}
-};
-
-int luaopen_lib (lua_State *L) {
-    luaL_openlib(L, "lunaclib", lib, 0);
-    return 1;
-}
-

lunajit.lua

@@ -2,7 +2,7 @@ local readbc = require('readbc')
 local vm = require('vm')
 local VM = vm.VM
 
-fp = io.open('tests/test1.luo')
+fp = io.open('snippets/test1.luo')
 header = readbc.read_header(fp)
 proto = readbc.read_proto(fp)
 fp:close()