lobject.h

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/*
** Tagged Values. This is the basic
** representation of values in Lua:
** an actual value plus a tag with
** its type.
*/
 
#define TValuefields \
    Value value_; \
    lu_byte tt_
#define TValuefields \ …
 
typedef struct TValue {
    TValuefields;
} TValue;
typedef struct TValue {…};
 
/*
** Entries in a Lua stack.
*/
typedef union StackValue {
    TValue val;
    struct {
        TValuefields;
        unsigned short delta;
    } tbclist;
} StackValue;
typedef union StackValue {…};
 
/*
** Nodes for Hash tables: A pack
** of two TValue's (key-value pairs)
** plus a 'next' field to link
** colliding entries.
*/
typedef union Node {
    struct NodeKey {
        TValuefields;
        lu_byte key_tt;
        int next;
        Value key_val;
    } u;
    struct NodeKey {…};
    TValue i_val;
} Node;
typedef union Node {…};