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view lwasm/pass6.c @ 502:14a40f8bb4eb
Add various operators to lwcc
Add various binary and ternary operators to lwcc, but only those which can
work with constant operands. Seems like variables are probably required
next.
author | William Astle <lost@l-w.ca> |
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date | Wed, 25 Sep 2019 20:23:49 -0600 |
parents | 58cafa61ab40 |
children |
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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)); } } } }