#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "node.h"
#include "sym.h"
#include "type.h"

static struct sym *__sym_alloc(struct symtab *st, const char *name,
			       const struct func *func)
{
	struct sym *sym;

	st->syms = realloc(st->syms, ++st->len * sizeof(*st->syms));
	assert(st->syms);

	st->syms[st->len - 1] = calloc(1, sizeof(struct sym));
	sym = st->syms[st->len - 1];
	sym->st   = st;
	sym->name = name;
	sym->func = func;
	return 0;
}

static struct sym *sym_alloc_ident(struct symtab *st, struct node *n,
				   const struct func *func)
{
	struct sym **sym;

	symtab_foreach(st, sym) {
		if (!strcmp((*sym)->name, n->ident.name))
			return *sym;
	}

	return __sym_alloc(st, n->ident.name, func);
}

struct sym *sym_alloc(struct symtab *st, struct node *n,
		      const struct func *func)
{
	switch (n->ntype) {
	case N_EXPR:
	case N_NUM:
	case N_STRING:
		return __sym_alloc(st, NULL, func);
	case N_IDENT:
		return sym_alloc_ident(st, n, func);
	}

	assert(0);
	return NULL;
}

void sym_dump(struct sym *sym, FILE *fp)
{
	type_dump(sym->type, sym->name, fp);
}

void symtab_dump(struct symtab *st, FILE *fp)
{
	struct sym **sym;

	symtab_foreach(st, sym) {
		if (!(*sym)->name)
			continue;

		sym_dump(*sym, fp);
		fputc('\n', fp);
	}
}