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view lwasm/struct.c @ 370:8764142b3192
Convert internal error/warning handling framework to a new unified system
Replace the ad hoc error and warning handling with a new system that
codifies the errors with specific codes. This makes it possible in the
future for error numbers to be used for testing and other purposes. It also
makes sure the error strings themselves are consistent.
Thanks to Erik G <erik@6809.org> for the patch.
author | William Astle <lost@l-w.ca> |
---|---|
date | Mon, 22 Jun 2015 18:49:38 -0600 |
parents | 211fc8038b8d |
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; }