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view lwasm/pass5.c @ 280:4370370f38d1
Correct CRC problems with DTS pseudo op
DTS actually emitted its code during the parse phase. While the code was
actually correct, this messed with the OS9 module CRC calculation, probably
due to the calculation being in the wrong order. The order of calculations
for a CRC do matter.
author | William Astle <lost@l-w.ca> |
---|---|
date | Tue, 16 Jul 2013 21:46:12 -0600 |
parents | 697bc543368c |
children | 8764142b3192 |
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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) { 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, "Cannot resolve line address"); } if (!exprok(as, cl -> daddr)) { lwasm_register_error(as, cl, "Cannot resolve line data address"); } } } }