#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 ref_lvl;   /* reference level: >0 for pointers */
    int offset;
} CVar;

typedef struct CType {
    char *name;
    struct CType *next;
    struct CType *fields; /* for a struct or union */
    int size;   /* memory footprint */
} CType;

typedef int (*Cmp_t)(void *, void *);
typedef unsigned int (*Hashfunc_t) (char *);
typedef struct CTable *CTable_t;

typedef struct CTNode {
    char *key;
    void *val;
    struct CTNode *next;
    int lvl;
} CTNode;

typedef struct CTable {
    struct CTNode *head[MAX_TABLE_SIZE];
    Cmp_t cmp;
    Hashfunc_t hfunc;
} CTable;


CTable_t ctable_create(Cmp_t cmp, Hashfunc_t hfunc);
void *ctable_lookup(CTable_t ct, char *key);
void ctable_insert(CTable_t ct, 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, char *name);
CType *cscope_lookup_type(CScope_t cs, 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);

Cmp_t var_cmp, type_cmp;
Hashfunc_t var_hfunc, type_hfunc;
#endif