--- /dev/null
+/*
+** Shared definitions for upb Lua modules.
+*/
+
+#ifndef UPB_LUA_UPB_H_
+#define UPB_LUA_UPB_H_
+
+#include "lauxlib.h"
+#include "upb/def.h"
+#include "upb/handlers.h"
+#include "upb/msg.h"
+#include "upb/msgfactory.h"
+
+/* Lua 5.1/5.2 compatibility code. */
+#if LUA_VERSION_NUM == 501
+
+#define lua_rawlen lua_objlen
+
+/* Lua >= 5.2's getuservalue/setuservalue functions do not exist in prior
+ * versions but the older function lua_getfenv() can provide 100% of its
+ * capabilities (the reverse is not true). */
+#define lua_getuservalue(L, index) lua_getfenv(L, index)
+#define lua_setuservalue(L, index) lua_setfenv(L, index)
+
+void *luaL_testudata(lua_State *L, int ud, const char *tname);
+
+#define lupb_setfuncs(L, l) luaL_register(L, NULL, l)
+
+#elif LUA_VERSION_NUM == 502
+
+int luaL_typerror(lua_State *L, int narg, const char *tname);
+
+#define lupb_setfuncs(L, l) luaL_setfuncs(L, l, 0)
+
+#else
+#error Only Lua 5.1 and 5.2 are supported
+#endif
+
+#define lupb_assert(L, predicate) \
+ if (!(predicate)) \
+ luaL_error(L, "internal error: %s, %s:%d ", #predicate, __FILE__, __LINE__);
+
+/* Function for initializing the core library. This function is idempotent,
+ * and should be called at least once before calling any of the functions that
+ * construct core upb types. */
+int luaopen_upb(lua_State *L);
+
+/* Gets or creates a package table for a C module that is uniquely identified by
+ * "ptr". The easiest way to supply a unique "ptr" is to pass the address of a
+ * static variable private in the module's .c file.
+ *
+ * If this module has already been registered in this lua_State, pushes it and
+ * returns true.
+ *
+ * Otherwise, creates a new module table for this module with the given name,
+ * pushes it, and registers the given top-level functions in it. It also sets
+ * it as a global variable, but only if the current version of Lua expects that
+ * (ie Lua 5.1/LuaJIT).
+ *
+ * If "false" is returned, the caller is guaranteed that this lib has not been
+ * registered in this Lua state before (regardless of any funny business the
+ * user might have done to the global state), so the caller can safely perform
+ * one-time initialization. */
+bool lupb_openlib(lua_State *L, void *ptr, const char *name,
+ const luaL_Reg *funcs);
+
+/* Custom check/push functions. Unlike the Lua equivalents, they are pinned to
+ * specific types (instead of lua_Number, etc), and do not allow any implicit
+ * conversion or data loss. */
+int64_t lupb_checkint64(lua_State *L, int narg);
+int32_t lupb_checkint32(lua_State *L, int narg);
+uint64_t lupb_checkuint64(lua_State *L, int narg);
+uint32_t lupb_checkuint32(lua_State *L, int narg);
+double lupb_checkdouble(lua_State *L, int narg);
+float lupb_checkfloat(lua_State *L, int narg);
+bool lupb_checkbool(lua_State *L, int narg);
+const char *lupb_checkstring(lua_State *L, int narg, size_t *len);
+const char *lupb_checkname(lua_State *L, int narg);
+
+void lupb_pushint64(lua_State *L, int64_t val);
+void lupb_pushint32(lua_State *L, int32_t val);
+void lupb_pushuint64(lua_State *L, uint64_t val);
+void lupb_pushuint32(lua_State *L, uint32_t val);
+void lupb_pushdouble(lua_State *L, double val);
+void lupb_pushfloat(lua_State *L, float val);
+
+/* Registers a type with the given name, methods, and metamethods. */
+void lupb_register_type(lua_State *L, const char *name, const luaL_Reg *m,
+ const luaL_Reg *mm);
+
+/* Checks the given upb_status and throws a Lua error if it is not ok. */
+void lupb_checkstatus(lua_State *L, upb_status *s);
+
+
+/** From def.c. ***************************************************************/
+
+upb_fieldtype_t lupb_checkfieldtype(lua_State *L, int narg);
+
+const upb_msgdef *lupb_msgdef_check(lua_State *L, int narg);
+const upb_enumdef *lupb_enumdef_check(lua_State *L, int narg);
+const upb_fielddef *lupb_fielddef_check(lua_State *L, int narg);
+upb_symtab *lupb_symtab_check(lua_State *L, int narg);
+
+void lupb_def_registertypes(lua_State *L);
+
+
+/** From msg.c. ***************************************************************/
+
+struct lupb_msgclass;
+typedef struct lupb_msgclass lupb_msgclass;
+
+upb_arena *lupb_arena_check(lua_State *L, int narg);
+int lupb_arena_new(lua_State *L);
+upb_arena *lupb_arena_get(lua_State *L);
+int lupb_msg_pushref(lua_State *L, int msgclass, void *msg);
+const upb_msg *lupb_msg_checkmsg(lua_State *L, int narg,
+ const lupb_msgclass *lmsgclass);
+upb_msg *lupb_msg_checkmsg2(lua_State *L, int narg,
+ const upb_msglayout **layout);
+
+const lupb_msgclass *lupb_msgclass_check(lua_State *L, int narg);
+const upb_msglayout *lupb_msgclass_getlayout(lua_State *L, int narg);
+const upb_msgdef *lupb_msgclass_getmsgdef(const lupb_msgclass *lmsgclass);
+upb_msgfactory *lupb_msgclass_getfactory(const lupb_msgclass *lmsgclass);
+void lupb_msg_registertypes(lua_State *L);
+
+#endif /* UPB_LUA_UPB_H_ */
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