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view lwasm/pass5.c @ 406:4411a6123716
Add "basic" output format
Add "basic" output format. This outputs the code in the form of a Basic
program that installs the assembled output. If an execution address is
provided to the END pseudo operation, it will transfer control there using
the Basic EXEC command.
Thanks to Tim Lindner <tlindner@macmess.org> for the original patch. I used
it mostly as is except for a couple of minor fixes for coding style and
removing a variable declaration from inside a for() statement for
portability reasons.
author | William Astle <lost@l-w.ca> |
---|---|
date | Thu, 03 Mar 2016 21:04:39 -0700 |
parents | 8764142b3192 |
children | 58cafa61ab40 |
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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, E_LINE_ADDRESS); } if (!exprok(as, cl -> daddr)) { lwasm_register_error(as, cl, E_LINED_ADDRESS); } } } }