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view lwasm/struct.c @ 389:2d9b7ae6c329
Throw error if address overflows in extended mode
This may or may not cause extra problems due to sloppiness in dealing with
calculations that overflow in 16 bits. However, presumably it is a good idea
so unless something major pops up, it seems like a good idea.
Thanks to Erik G <erik@6809.org> for the patch.
author | William Astle <lost@l-w.ca> |
---|---|
date | Mon, 13 Jul 2015 21:37:49 -0600 |
parents | 8764142b3192 |
children |
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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, E_STRUCT_RECURSE); return; } if (l -> sym == NULL) { lwasm_register_error(as, l, E_STRUCT_NOSYMBOL); return; } for (s = as -> structs; s; s = s -> next) { if (!strcmp(s -> name, l -> sym)) break; } if (s) { lwasm_register_error(as, l, E_STRUCT_DUPE); 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_error(as, l, W_ENDSTRUCT_WITHOUT); 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, E_STRUCT_NONAME); 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; }