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#ifndef SEMANTICS_H
#define SEMANTICS_H
#define MAX_TABLE_SIZE 1021
struct CTable;
typedef struct CVar{
char *name;
struct CVar *next; /* next in the linked list */
struct CType *type;
int offset;
} CVar;
typedef struct CType {
enum {
INT,
CHAR,
VOID,
STRUCT,
UNION,
ARR,
PTR
} type;
char *name;
struct CType *next;
union {
struct CType *fields; /* for a struct or union */
struct CType *ref; /* for a pointer */
struct {
struct CType *elem;
int len;
} arr; /* for an array */
} rec;
int size; /* memory footprint */
} CType;
typedef unsigned int (*Hashfunc_t) (const char *);
typedef struct CTable *CTable_t;
typedef struct CTNode {
const char *key;
void *val;
struct CTNode *next;
int lvl;
} CTNode;
typedef struct CTable {
struct CTNode *head[MAX_TABLE_SIZE];
Hashfunc_t hfunc;
} CTable;
CTable_t ctable_create(Hashfunc_t hfunc);
void *ctable_lookup(CTable_t ct, const char *key);
void ctable_insert(CTable_t ct, const char *key, void *val, int lvl);
void ctable_clip(CTable_t ct, unsigned int hv, int max_lvl);
typedef struct CSNode {
struct CVar *vhead;
struct CType *thead;
struct CSNode *next;
} CSNode;
typedef struct CScope *CScope_t;
typedef struct CScope {
int lvl;
struct CSNode *top;
struct CTable *tvar;
struct CTable *ttype;
} CScope;
CScope_t cscope_create();
CVar *cscope_lookup_var(CScope_t cs, const char *name);
CType *cscope_lookup_type(CScope_t cs, const char *name);
void cscope_push_var(CScope_t cs, CVar *var);
void cscope_push_type(CScope_t cs, CType *type);
void cscope_enter(CScope_t cs);
void cscope_exit(CScope_t cs);
unsigned int bkdr_hash(const char *str);
#endif
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