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view lwasm/macro.c @ 402:b20f14edda5a
Completed initial conversion to new parser allowing spaces in operands
Converted the remaining addressing modes. This required a complete rewrite
of a large portion of the indexed addressing parser. Now the entire indexed
parsing system is programmatic without cheating with a lookup table.
This update also fixes the "force 0,r" by writing a literal 0,r which is
*supposed* to work.
There will likely be some pseudo ops that need tweaking for space handling,
specially those that take multiple operands of some description which are
not expressions. (The expression parser call eats the spaces both before and
after the expression, if appropriate.)
author | William Astle <lost@l-w.ca> |
---|---|
date | Wed, 14 Oct 2015 20:49:41 -0600 |
parents | 39490cf2d1c2 |
children | 5524649f4784 |
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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, E_MACRO_RECURSE); return; } if (!(l -> sym)) { lwasm_register_error(as, l, E_MACRO_NONAME); return; } for (m = as -> macros; m; m = m -> next) { if (!strcasecmp(m -> name, l -> sym)) break; } if (m) { lwasm_register_error(as, l, E_MACRO_DUPE); 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, E_MACRO_ENDM); 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 (!strcasecmp(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; }