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view lwasm/pass5.c @ 308:670ea8f90212 ccdev
Converted preproc logic to library and moved some utility stuff to lwlib
The strbuf and strpool stuff is generally useful so move it to lwlib where
other such things live.
Also, package the preprocessor logic into a library for easy use in multiple
places.
author | William Astle <lost@l-w.ca> |
---|---|
date | Sat, 21 Sep 2013 13:33:54 -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"); } } } }