path: root/semantics.c

#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "semantics.h"
#define NEW(type) ((type *)malloc(sizeof(type)))

#ifdef CIBIC_DEBUG
CTable_t ctable_create(Hashfunc_t hfunc, Printfunc_t pfunc) {
    CTable_t ct = NEW(CTable);
    memset(ct->head, 0, sizeof(CTNode*) * MAX_TABLE_SIZE);
    ct->hfunc = hfunc;
    ct->pfunc = pfunc;
    return ct;
}
#else
CTable_t ctable_create(Hashfunc_t hfunc) {
    CTable_t ct = NEW(CTable);
    memset(ct->head, 0, sizeof(CTNode*) * MAX_TABLE_SIZE);
    ct->hfunc = hfunc;
    return ct;
}
#endif

void *ctable_lookup(CTable_t ct, const char *key) {
    unsigned int hv = ct->hfunc(key) % MAX_TABLE_SIZE;
    CTNode *p = ct->head[hv];
    for (; p; p = p->next)
        if (!strcmp(p->key, key))
            return p->val;
    return NULL; /* not found */
}

int ctable_insert(CTable_t ct, const char *key, void *val, int lvl) {
    unsigned int hv = ct->hfunc(key) % MAX_TABLE_SIZE;
    CTNode *p = ct->head[hv];
    CTNode *np;
    for (; p && p->lvl == lvl; p = p->next)
        if (!strcmp(p->key, key))
            return 0; /* conflict */
    np = NEW(CTNode);
    np->key = key;
    np->val = val;
    np->lvl = lvl;
    np->next = ct->head[hv];
    ct->head[hv] = np;
    return 1;
}

void ctable_clip(CTable_t ct, const char *key, int max_lvl) {
    unsigned int hv = ct->hfunc(key) % MAX_TABLE_SIZE;
    CTNode *p = ct->head[hv], *np;
    for (; p && p->lvl > max_lvl; p = np)
    {
        np = p->next;
        free(p);
    }
    ct->head[hv] = p;
}

CScope_t cscope_create() {
    CScope_t p = NEW(CScope);
    p->lvl = -1;
    p->top = NULL;
#ifdef CIBIC_DEBUG
    p->tvar = ctable_create(bkdr_hash, cvar_print);
    p->ttype = ctable_create(bkdr_hash, ctype_print);
#else
    p->tvar = ctable_create(bkdr_hash);
    p->ttype = ctable_create(bkdr_hash);
#endif
    cscope_enter(p);
    return p;
}

int cscope_push_var(CScope_t cs, CVar *var) {
#ifdef CIBIC_DEBUG
    assert(cs->top);
#endif
    if (ctable_insert(cs->tvar, var->name, var, cs->lvl))
    {
        var->next = cs->top->vhead;
        cs->top->vhead = var;
        return 1;
    }
    else return 0; /* naming conflict */
}

int cscope_push_type(CScope_t cs, CType *type) {
#ifdef CIBIC_DEBUG
    assert(cs->top);
#endif
    if (ctable_insert(cs->ttype, type->name, type, cs->lvl))
    {
        type->next = cs->top->thead;
        cs->top->thead = type;
        return 1;
    }
    else return 0; /* naming conflict */
}

void cscope_enter(CScope_t cs) {
    CSNode *np = NEW(CSNode);
    np->next = cs->top;
    np->vhead = NULL;
    np->thead = NULL;
    cs->top = np;
    cs->lvl++;
}

void