view lwasm/pass6.c @ 467:a6c9129e5948

Move version header into a common direction to better reflect what it is. The version header isn't really associated with lwlib itself since that is intended to be some generic type routines that can be used by other programs. It is, however, directly associated with lwtools. Thus, it should be related to lwtools itself rather than the more generic lwlib.
author William Astle <lost@l-w.ca>
date Thu, 01 Mar 2018 21:25:51 -0700
parents 58cafa61ab40
children
line wrap: on
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/*
pass6.c

Copyright © 2010 William Astle

This file is part of LWTOOLS.

LWTOOLS is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <string.h>

#include <lw_alloc.h>
#include <lw_string.h>

#include "lwasm.h"
#include "instab.h"

/*
Finalize Pass

Reduce all expressions in a final pass.

Observation:

Everything should reduce as far as it is going to in a single pass
because all line addresses are now constant (or section-base offset)
*/

static int exprok_aux(lw_expr_t e, void *priv)
{
	asmstate_t *as = priv;
	
	if (lw_expr_istype(e, lw_expr_type_int))
		return 0;
	
	if (as -> output_format == OUTPUT_OBJ || as -> output_format == OUTPUT_LWMOD)
	{
		if (lw_expr_istype(e, lw_expr_type_oper))
			return 0;
		if (lw_expr_istype(e, lw_expr_type_special) && (as -> output_format == OUTPUT_OBJ || as -> output_format == OUTPUT_LWMOD))
		{
			int t;
			t = lw_expr_specint(e);
			if (t == lwasm_expr_secbase || t == lwasm_expr_syment || t == lwasm_expr_import)
				return 0;
		}
	}
	
	return 1;
}

static int exprok(asmstate_t *as, lw_expr_t e)
{
	if (lw_expr_testterms(e, exprok_aux, as))
		return 0;
	return 1;
}


void do_pass6(asmstate_t *as)
{
	line_t *cl;
	struct line_expr_s *le;

	for (cl = as -> line_head; cl; cl = cl -> next)
	{
		as -> cl = cl;
		for (le = cl -> exprs; le; le = le -> next)
		{
			lwasm_reduce_expr(as, le -> expr);
			if (!exprok(as, le -> expr))
			{
				lwasm_register_error2(as, cl, E_EXPRESSION_BAD, "%s", lw_expr_print(le -> expr));
			}
		}
	}
}