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view lwasm/pass6.c @ 389:2d9b7ae6c329
Throw error if address overflows in extended mode
This may or may not cause extra problems due to sloppiness in dealing with
calculations that overflow in 16 bits. However, presumably it is a good idea
so unless something major pops up, it seems like a good idea.
Thanks to Erik G <erik@6809.org> for the patch.
author | William Astle <lost@l-w.ca> |
---|---|
date | Mon, 13 Jul 2015 21:37:49 -0600 |
parents | 8764142b3192 |
children | 58cafa61ab40 |
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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) { 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) { 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)); } } } }