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view lwasm/pragma.c @ 333:507f442dc71e
Add support for 6800 compatibility instructions.
The occasional program uses the 6800 compatibility instructions since they
are actually specified by Motorola in at least some documentation. They
advertised the 6809 as source compatible with the 6800.
This mode is not enabled by default, however. It is my belief that receiving
an error when using a non-6809 instruction is more useful since it is
unlikely that much 6800 source code is being assembled for the 6809 these
days. Nevertheless, the --6809compat option is present for just those
purposes so one does not have to resort to using macros (which would work
equally well in most cases).
author | William Astle <lost@l-w.ca> |
---|---|
date | Tue, 15 Apr 2014 10:57:34 -0600 |
parents | 0c4b3e8b4d0b |
children | 98f3e016cfd8 |
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/* pragma.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 <string.h> #include <ctype.h> #include <lw_string.h> #include <lw_alloc.h> #include "lwasm.h" #include "instab.h" #include "input.h" struct pragma_list { const char *setstr; const char *resetstr; int flag; }; struct pragma_stack_entry { int magic; // must always be at the start of any input stack entry int flag; // the pragma flag bit char str[1]; // magic number - this will be allocated bigger // string will be what's needed to re-instate a pragma }; static const struct pragma_list set_pragmas[] = { { "dollarnotlocal", "nodollarnotlocal", PRAGMA_DOLLARNOTLOCAL }, { "nodollarlocal", "dollarlocal", PRAGMA_DOLLARNOTLOCAL }, { "noindex0tonone", "index0tonone", PRAGMA_NOINDEX0TONONE }, { "undefextern", "noundefextern", PRAGMA_UNDEFEXTERN }, { "cescapes", "nocescapes", PRAGMA_CESCAPES }, { "importundefexport", "noimportundefexport", PRAGMA_IMPORTUNDEFEXPORT }, { "pcaspcr", "nopcaspcr", PRAGMA_PCASPCR }, { "shadow", "noshadow", PRAGMA_SHADOW }, { "nolist", "list", PRAGMA_NOLIST }, { "autobranchlength", "noautobranchlength", PRAGMA_AUTOBRANCHLENGTH }, { "export", "noexport", PRAGMA_EXPORT }, { "symbolnocase", "nosymbolnocase", PRAGMA_SYMBOLNOCASE }, { "nosymbolcase", "symbolcase", PRAGMA_SYMBOLNOCASE }, { "condundefzero", "nocondundefzero", PRAGMA_CONDUNDEFZERO }, { "6800compat", "no6800compat", PRAGMA_6800COMPAT }, { 0, 0, 0} }; int parse_pragma_string(asmstate_t *as, char *str, int ignoreerr) { char *p; int i; const char *np = str; int pragmas = as -> pragmas; while (np) { p = lw_token(np, ',', &np); debug_message(as, 200, "Setting pragma %s", p); for (i = 0; set_pragmas[i].setstr; i++) { if (!strcasecmp(p, set_pragmas[i].setstr)) { pragmas |= set_pragmas[i].flag; goto out; } if (!strcasecmp(p, set_pragmas[i].resetstr)) { pragmas &= ~(set_pragmas[i].flag); goto out; } } /* unrecognized pragma here */ if (!ignoreerr) { lw_free(p); return 0; } out: lw_free(p); } as -> pragmas = pragmas; return 1; } PARSEFUNC(pseudo_parse_pragma) { char *ps, *t; for (t = *p; *t && !isspace(*t); t++) /* do nothing */ ; ps = lw_strndup(*p, t - *p); *p = t; l -> len = 0; if (parse_pragma_string(as, ps, 0) == 0) { lwasm_register_error(as, l, "Unrecognized pragma string"); } if (as -> pragmas & PRAGMA_NOLIST) l -> pragmas |= PRAGMA_NOLIST; lw_free(ps); } PARSEFUNC(pseudo_parse_starpragma) { char *ps, *t; for (t = *p; *t && !isspace(*t); t++) /* do nothing */ ; ps = lw_strndup(*p, t - *p); *p = t; l -> len = 0; // *pragma must NEVER throw an error parse_pragma_string(as, ps, 1); if (as -> pragmas & PRAGMA_NOLIST) l -> pragmas |= PRAGMA_NOLIST; lw_free(ps); } static int pragma_stack_compare(input_stack_entry *e, void *d) { int flag = *((int *)d); struct pragma_stack_entry *pse = (struct pragma_stack_entry *)e; if (pse -> flag == flag) return 1; return 0; } PARSEFUNC(pseudo_parse_starpragmapop) { char *ps, *t; char *pp; int i; const char *np; struct pragma_stack_entry *pse; for (t = *p; *t && !isspace(*t); t++) /* do nothing */ ; ps = lw_strndup(*p, t - *p); *p = t; l -> len = 0; // *pragma stuff must never throw an error np = ps; while (np) { pp = lw_token(np, ',', &np); for (i = 0; set_pragmas[i].setstr; i++) { if (!strcasecmp(pp, set_pragmas[i].setstr) || !strcasecmp(pp, set_pragmas[i].resetstr)) { pse = (struct pragma_stack_entry *)input_stack_pop(as, 0x42424242, pragma_stack_compare, (void *)&(set_pragmas[i].flag)); if (pse) { debug_message(as, 100, "Popped pragma string %s", pse->str); parse_pragma_string(as, (char *)&(pse->str), 1); lw_free(pse); } if (set_pragmas[i].flag == PRAGMA_NOLIST) l -> pragmas |= PRAGMA_NOLIST; } } lw_free(pp); } lw_free(ps); } PARSEFUNC(pseudo_parse_starpragmapush) { char *ps, *t; char *pp; int i; const char *np; struct pragma_stack_entry *pse; for (t = *p; *t && !isspace(*t); t++) /* do nothing */ ; ps = lw_strndup(*p, t - *p); *p = t; l -> len = 0; // *pragma stuff must never throw an error np = ps; while (np) { pp = lw_token(np, ',', &np); for (i = 0; set_pragmas[i].setstr; i++) { if (!strcasecmp(pp, set_pragmas[i].setstr) || !strcasecmp(pp, set_pragmas[i].resetstr)) { /* found set or reset pragma */ /* push pragma state */ if (as -> pragmas & (set_pragmas[i].flag)) { /* use set string */ t = (char *)set_pragmas[i].setstr; } else { /* use reset string */ t = (char *)set_pragmas[i].resetstr; } pse = lw_alloc(sizeof(struct pragma_stack_entry) + strlen(t)); pse -> flag = set_pragmas[i].flag; pse -> magic = 0x42424242; strcpy((char *)&(pse -> str), t); debug_message(as, 100, "Pushed pragma string %s", pse->str); input_stack_push(as, (input_stack_entry *)pse); if (set_pragmas[i].flag == PRAGMA_NOLIST) l -> pragmas |= PRAGMA_NOLIST; } } lw_free(pp); } lw_free(ps); }