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view lwasm/macro.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 | 03f7192fcd20 |
children | 8764142b3192 |
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/* macro.c Copyright © 2008 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 macro processing */ #include <ctype.h> #include <stdlib.h> #include <string.h> #include <stdio.h> #include <lw_alloc.h> #include <lw_string.h> #include "lwasm.h" #include "input.h" #include "instab.h" PARSEFUNC(pseudo_parse_macro) { macrotab_t *m; char *t; char tc; l -> len = 0; l -> hideline = 1; if (as -> skipcond) { as -> skipmacro = 1; return; } if (as -> inmacro) { lwasm_register_error(as, l, "Attempt to define a macro inside a macro"); return; } if (!(l -> sym)) { lwasm_register_error(as, l, "Missing macro name"); return; } for (m = as -> macros; m; m = m -> next) { if (!strcmp(m -> name, l -> sym)) break; } if (m) { lwasm_register_error(as, l, "Duplicate macro definition"); return; } m = lw_alloc(sizeof(macrotab_t)); m -> name = lw_strdup(l -> sym); m -> next = as -> macros; m -> lines = NULL; m -> numlines = 0; m -> flags = 0; m -> definedat = l; as -> macros = m; t = *p; while (**p && !isspace(**p)) (*p)++; tc = **p; /* ignore unknown flags */ if (strcasecmp(t, "noexpand") == 0) m -> flags |= macro_noexpand; **p = tc; as -> inmacro = 1; } PARSEFUNC(pseudo_parse_endm) { l -> hideline = 1; l -> len = 0; if (as -> skipcond) { as -> skipmacro = 0; return; } if (!as -> inmacro) { lwasm_register_error(as, l, "ENDM without MACRO"); return; } as -> inmacro = 0; // a macro definition counts as a context break for local symbols as -> context = lwasm_next_context(as); } // the current macro will ALWAYS be the first one in the table int add_macro_line(asmstate_t *as, char *optr) { if (!as -> inmacro) return 0; as -> macros -> lines = lw_realloc(as -> macros -> lines, sizeof(char *) * (as -> macros -> numlines + 1)); as -> macros -> lines[as -> macros -> numlines] = lw_strdup(optr); as -> macros -> numlines += 1; return 1; } void macro_add_to_buff(char **buff, int *loc, int *len, char c) { if (*loc == *len) { *buff = lw_realloc(*buff, *len + 32); *len += 32; } (*buff)[(*loc)++] = c; } // this is just like a regular operation function /* macro args are referenced by "\n" where 1 <= n <= 9 or by "\{n}"; a \ can be included by writing \\ a comma separates argument but one can be included with "\," whitespace ends argument list but can be included with "\ " or the like */ int expand_macro(asmstate_t *as, line_t *l, char **p, char *opc) { int lc; line_t *cl; //, *nl; int oldcontext; macrotab_t *m; char **args = NULL; // macro arguments int nargs = 0; // number of arguments char *p2, *p3; int bloc, blen; char *linebuff; for (m = as -> macros; m; m = m -> next) { if (!strcmp(opc, m -> name)) break; } // signal no macro expansion if (!m) return -1; // save current symbol context for after macro expansion oldcontext = as -> context; cl = l; as -> context = lwasm_next_context(as); while (**p && !isspace(**p) && **p) { p2 = *p; while (*p2 && !isspace(*p2) && *p2 != ',') { if (*p2 == '\\') { if (p2[1]) p2++; } p2++; } // have arg here args = lw_realloc(args, sizeof(char *) * (nargs + 1)); args[nargs] = lw_alloc(p2 - *p + 1); args[nargs][p2 - *p] = '\0'; memcpy(args[nargs], *p, p2 - *p); *p = p2; // now collapse out "\" characters for (p3 = p2 = args[nargs]; *p2; p2++, p3++) { if (*p2 == '\\' && p2[1]) { p2++; } *p3 = *p2; } *p3 = '\0'; nargs++; if (**p == ',') (*p)++; } // now create a string for the macro // and push it into the front of the input stack bloc = blen = 0; linebuff = NULL; if (m -> flags & macro_noexpand) { char ctcbuf[100]; char *p; snprintf(ctcbuf, 100, "\001\001SETNOEXPANDSTART\n"); for (p = ctcbuf; *p; p++) macro_add_to_buff(&linebuff, &bloc, &blen, *p); } for (lc = 0; lc < m -> numlines; lc++) { for (p2 = m -> lines[lc]; *p2; p2++) { if (*p2 == '\\' && p2[1] == '*') { int n; /* all arguments */ for (n = 0; n < nargs; n++) { for (p3 = args[n]; *p3; p3++) { macro_add_to_buff(&linebuff, &bloc, &blen, *p3); } if (n != (nargs -1)) { macro_add_to_buff(&linebuff, &bloc, &blen, ','); } } p2++; } else if (*p2 == '\\' && isdigit(p2[1])) { int n; p2++; n = *p2 - '0'; if (n == 0) { for (p3 = m -> name; *p3; p3++) macro_add_to_buff(&linebuff, &bloc, &blen, *p3); continue; } if (n < 1 || n > nargs) continue; for (p3 = args[n - 1]; *p3; p3++) macro_add_to_buff(&linebuff, &bloc, &blen, *p3); continue; } else if (*p2 == '{') { int n = 0, n2; p2++; while (*p2 && isdigit(*p2)) { n2 = *p2 - '0'; if (n2 < 0 || n2 > 9) n2 = 0; n = n * 10 + n2; p2++; } if (*p2 == '}') p2++; if (n == 0) { for (p3 = m -> name; *p3; p3++) macro_add_to_buff(&linebuff, &bloc, &blen, *p3); continue; } if (n < 1 || n > nargs) continue; for (p3 = args[n - 1]; *p3; p3++) macro_add_to_buff(&linebuff, &bloc, &blen, *p3); continue; } else { macro_add_to_buff(&linebuff, &bloc, &blen, *p2); } } macro_add_to_buff(&linebuff, &bloc, &blen, '\n'); } if (m -> flags & macro_noexpand) { char ctcbuf[100]; char *p; snprintf(ctcbuf, 100, "\001\001SETNOEXPANDEND\n"); for (p = ctcbuf; *p; p++) macro_add_to_buff(&linebuff, &bloc, &blen, *p); } { char ctcbuf[100]; char *p; snprintf(ctcbuf, 100, "\001\001SETCONTEXT %d\n\001\001SETLINENO %d\n", oldcontext, cl -> lineno + 1); for (p = ctcbuf; *p; p++) macro_add_to_buff(&linebuff, &bloc, &blen, *p); } macro_add_to_buff(&linebuff, &bloc, &blen, 0); // push the macro into the front of the stream input_openstring(as, opc, linebuff); lw_free(linebuff); // clean up if (args) { while (nargs) { lw_free(args[--nargs]); } lw_free(args); } // indicate a macro was expanded l -> hideline = 1; return 0; }