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Checkpoint parser development for lwcc
Beginning of lemon based parser for C including all the infrastructure for
calling the lemon generated parser. This requires a translation layer from
the preprocessor token numbers to the lemon parser token numbers due to the
fact that lemon wants to control the token numbers. Eventually when the
lemon parser gets replaced with a hand crafted recursive descent parser,
this translation will no longer be required. However, in the interest of
getting things working sooner rather than later, using something like lemon
is beneficial.
author | William Astle <lost@l-w.ca> |
---|---|
date | Sun, 17 Nov 2013 11:59:36 -0700 |
parents | 670ea8f90212 |
children |
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/* lwcc/cpp.c Copyright © 2013 William Astle This file is part of LWTOOLS. LWTOOLS 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/>. */ #include <stdarg.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <lw_alloc.h> #include <lw_string.h> #include <lw_stringlist.h> #include <lw_strpool.h> #include "cpp.h" struct token *preproc_lex_next_token(struct preproc_info *); struct preproc_info *preproc_init(const char *fn) { FILE *fp; struct preproc_info *pp; if (!fn || (fn[0] == '-' && fn[1] == '0')) { fp = stdin; } else { fp = fopen(fn, "rb"); } if (!fp) return NULL; pp = lw_alloc(sizeof(struct preproc_info)); memset(pp, 0, sizeof(struct preproc_info)); pp -> strpool = lw_strpool_create(); pp -> fn = lw_strpool_strdup(pp -> strpool, fn); pp -> fp = fp; pp -> ra = CPP_NOUNG; pp -> unget = CPP_NOUNG; pp -> ppeolseen = 1; pp -> lineno = 1; pp -> n = NULL; pp -> quotelist = lw_stringlist_create(); pp -> inclist = lw_stringlist_create(); return pp; } void preproc_add_include(struct preproc_info *pp, char *dir, int sys) { if (sys) lw_stringlist_addstring(pp -> inclist, dir); else lw_stringlist_addstring(pp -> quotelist, dir); } struct token *preproc_next_token(struct preproc_info *pp) { struct token *t; if (pp -> curtok) token_free(pp -> curtok); /* If there is a list of tokens to process, move it to the "unget" queue with an EOF marker at the end of it. */ if (pp -> sourcelist) { for (t = pp -> sourcelist; t -> next; t = t -> next) /* do nothing */ ; t -> next = token_create(TOK_EOF, NULL, -1, -1, ""); t -> next -> next = pp -> tokqueue; pp -> tokqueue = pp -> sourcelist; pp -> sourcelist = NULL; } again: if (pp -> tokqueue) { t = pp -> tokqueue; pp -> tokqueue = t -> next; if (pp -> tokqueue) pp -> tokqueue -> prev = NULL; t -> next = NULL; t -> prev = NULL; pp -> curtok = t; goto ret; } pp -> curtok = preproc_lex_next_token(pp); t = pp -> curtok; ret: if (t -> ttype == TOK_ENDEXPAND) { struct expand_e *e; e = pp -> expand_list; pp -> expand_list = e -> next; lw_free(e); goto again; } return t; } void preproc_unget_token(struct preproc_info *pp, struct token *t) { t -> next = pp -> tokqueue; pp -> tokqueue = t; if (pp -> curtok == t) pp -> curtok = NULL; } void preproc_finish(struct preproc_info *pp) { fclose(pp -> fp); lw_stringlist_destroy(pp -> inclist); lw_stringlist_destroy(pp -> quotelist); if (pp -> curtok) token_free(pp -> curtok); while (pp -> tokqueue) { preproc_next_token(pp); token_free(pp -> curtok); } lw_strpool_free(pp -> strpool); lw_free(pp); } void preproc_register_error_callback(struct preproc_info *pp, void (*cb)(const char *)) { pp -> errorcb = cb; } void preproc_register_warning_callback(struct preproc_info *pp, void (*cb)(const char *)) { pp -> warningcb = cb; } static void preproc_throw_error_default(const char *m) { fprintf(stderr, "ERROR: %s\n", m); } static void preproc_throw_warning_default(const char *m) { fprintf(stderr, "WARNING: %s\n", m); } static void preproc_throw_message(struct preproc_info *pp, void (*cb)(const char *), const char *m, va_list args) { int s, s2; char *b; s2 = snprintf(NULL, 0, "(%s:%d:%d) ", pp -> fn, pp -> lineno, pp -> column); s = vsnprintf(NULL, 0, m, args); b = lw_alloc(s + s2 + 1); snprintf(b, s2 + 1, "(%s:%d:%d) ", pp -> fn, pp -> lineno, pp -> column); vsnprintf(b + s2, s + 1, m, args); (*cb)(b); lw_free(b); } void preproc_throw_error(struct preproc_info *pp, const char *m, ...) { va_list args; va_start(args, m); preproc_throw_message(pp, pp -> errorcb ? pp -> errorcb : preproc_throw_error_default, m, args); va_end(args); exit(1); } void preproc_throw_warning(struct preproc_info *pp, const char *m, ...) { va_list args; va_start(args, m); preproc_throw_message(pp, pp -> warningcb ? pp -> warningcb : preproc_throw_warning_default, m, args); va_end(args); }