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view lwasm/struct.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 | 211fc8038b8d |
children | 8764142b3192 |
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/* struct.c Copyright © 2010 William Astle This file is part of LWASM. LWASM 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/>. Contains stuff associated with structure processing */ #include <string.h> #include <lw_alloc.h> #include <lw_string.h> #include "lwasm.h" #include "instab.h" PARSEFUNC(pseudo_parse_struct) { structtab_t *s; if (as -> instruct) { lwasm_register_error(as, l, "Attempt to define a structure inside a structure"); return; } if (l -> sym == NULL) { lwasm_register_error(as, l, "Structure definition with no effect - no symbol"); return; } for (s = as -> structs; s; s = s -> next) { if (!strcmp(s -> name, l -> sym)) break; } if (s) { lwasm_register_error(as, l, "Duplicate structure definition"); return; } as -> instruct = 1; s = lw_alloc(sizeof(structtab_t)); s -> name = lw_strdup(l -> sym); s -> next = as -> structs; s -> fields = NULL; s -> size = 0; s -> definedat = l; as -> structs = s; as -> cstruct = s; skip_operand(p); l -> len = 0; l -> symset = 1; // save current assembly address and initialize to 0 as -> savedaddr = l -> addr; l -> addr = lw_expr_build(lw_expr_type_int, 0); } static void instantiate_struct(asmstate_t *as, line_t *l, structtab_t *s, char *pref, lw_expr_t baseaddr) { int len; char *t; int plen; int addr = 0; lw_expr_t te, te2; structtab_field_t *e; if (baseaddr == NULL) baseaddr = l -> addr; plen = strlen(pref); for (e = s -> fields; e; e = e -> next) { if (e -> name) { len = plen + strlen(e -> name) + 1; t = lw_alloc(len + 1); sprintf(t, "%s.%s", pref, e -> name); } else { len = plen + 30; t = lw_alloc(len + 1); sprintf(t, "%s.____%d", pref, addr); } te = lw_expr_build(lw_expr_type_int, addr); te2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, te, baseaddr); register_symbol(as, l, t, te2, symbol_flag_nocheck); lw_expr_destroy(te); if (e -> substruct) { instantiate_struct(as, l, e -> substruct, t, te2); } lw_expr_destroy(te2); lw_free(t); addr += e -> size; } /* register the "sizeof" symbol */ len = plen + 8; t = lw_alloc(len + 1); sprintf(t, "sizeof{%s}", pref); te = lw_expr_build(lw_expr_type_int, s -> size); register_symbol(as, l, t, te, symbol_flag_nocheck); lw_expr_destroy(te); lw_free(t); } PARSEFUNC(pseudo_parse_endstruct) { lw_expr_t te; if (as -> instruct == 0) { lwasm_register_warning(as, l, "endstruct without struct"); skip_operand(p); return; } te = lw_expr_build(lw_expr_type_int, 0); // make all the relevant generic struct symbols instantiate_struct(as, l, as -> cstruct, as -> cstruct -> name, te); lw_expr_destroy(te); l -> soff = as -> cstruct -> size; as -> instruct = 0; skip_operand(p); lw_expr_destroy(l -> addr); l -> addr = as -> savedaddr; as -> savedaddr = NULL; l -> len = 0; } void register_struct_entry(asmstate_t *as, line_t *l, int size, structtab_t *ss) { structtab_field_t *e, *e2; l -> soff = as -> cstruct -> size; e = lw_alloc(sizeof(structtab_field_t)); e -> next = NULL; e -> size = size; if (l -> sym) e -> name = lw_strdup(l -> sym); else e -> name = NULL; e -> substruct = ss; if (as -> cstruct -> fields) { for (e2 = as -> cstruct -> fields; e2 -> next; e2 = e2 -> next) /* do nothing */ ; e2 -> next = e; } else { as -> cstruct -> fields = e; } as -> cstruct -> size += size; } int expand_struct(asmstate_t *as, line_t *l, char **p, char *opc) { structtab_t *s; debug_message(as, 200, "Checking for structure expansion: %s", opc); for (s = as -> structs; s; s = s -> next) { if (!strcmp(opc, s -> name)) break; } if (!s) return -1; debug_message(as, 10, "Expanding structure: %s", opc); if (!(l -> sym)) { lwasm_register_error(as, l, "Cannot declare a structure without a symbol name."); return -1; } l -> len = s -> size; if (as -> instruct) { /* register substruct here */ register_struct_entry(as, l, s -> size, s); /* mark the symbol consumed */ l -> symset = 1; l -> len = 0; return 0; } else { /* instantiate the struct here */ instantiate_struct(as, l, s, l -> sym, NULL); return 0; } return 0; }