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view lwasm/pass5.c @ 455:cad5937314cb
Add operandsizewarning pragma
Add operandsizewarning pragma that will raise warnings for certain operands
if the operand size could be smaller. (Long branch used instead of short
branch, for instance.)
author | William Astle <lost@l-w.ca> |
---|---|
date | Fri, 16 Feb 2018 22:53:46 -0700 |
parents | 58cafa61ab40 |
children |
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/* pass5.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" /* AssignAddresses Pass Force resolution of all line addresses */ 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 (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) 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_pass5(asmstate_t *as) { // int rc; int cnt; int ocnt; line_t *cl, *sl; // struct line_expr_s *le; // first, count the number of non-constant addresses; do // a reduction first on each one for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next) { as -> cl = cl; lwasm_reduce_expr(as, cl -> addr); if (!exprok(as, cl -> addr)) cnt++; lwasm_reduce_expr(as, cl -> daddr); if (!exprok(as, cl -> daddr)) cnt++; } sl = as -> line_head; while (cnt > 0) { ocnt = cnt; // find an unresolved address for ( ; sl && exprok(as, sl -> addr) && exprok(as, sl -> daddr); sl = sl -> next) /* do nothing */ ; // simplify address for (cl = sl; cl; cl = cl -> next) { as -> cl = sl; lwasm_reduce_expr(as, sl -> addr); if (exprok(as, cl -> addr)) { if (0 == --cnt) return; } lwasm_reduce_expr(as, sl -> daddr); if (exprok(as, cl -> addr)) { if (0 == --cnt) return; } } if (cnt == ocnt) break; } if (cnt) { // we have non-resolved line addresses here for (cl = sl; cl; cl = cl -> next) { if (!exprok(as, cl -> addr)) { lwasm_register_error(as, cl, E_LINE_ADDRESS); } if (!exprok(as, cl -> daddr)) { lwasm_register_error(as, cl, E_LINED_ADDRESS); } } } }