ply/sym.c

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

#include "sym.h"

sym_t *sym_get(symtab_t *st, const char *name)
{
	size_t i;

	for (i = 0; i < st->len; i++) {
		if (!strcmp(st->sym[i].name, name))
			return &st->sym[i];
	}

	return NULL;
}

int sym_add(symtab_t *st, const char *name, type_t *type, sym_t **new)
{
	sym_t *sym;

	sym = sym_get(st, name);
	if (sym) {
		/* if there is no type info, accept anything */
		if (!sym->type)
			sym->type = type;
		/* otherwise, if specified, it must match */
		else if (type && !type_equal(sym->type, type))
			return -EINVAL;

		goto found;
	}

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

	sym = &st->sym[st->len-1];
	sym->st   = st;
	sym->name = name;
	sym->type = type;
found:
	if (new)
		*new = sym;
	return 0;
}

void sym_dump(sym_t *sym, FILE *fp)
{
	type_dump(sym->type, fp);
	fputc(' ', fp);
	fputs(sym->name, fp);
}

void symtab_dump(symtab_t *st, FILE *fp)
{
	size_t i;

	for (i = 0; i < st->len; i++) {
		sym_dump(&st->sym[i], fp);
		fputc('\n', fp);
	}
}