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annotate lwcc/cpp.c @ 314:a3e277c58df9 ccdev
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 |
| rev | line source |
|---|---|
| 295 | 1 /* |
| 2 lwcc/cpp.c | |
| 3 | |
| 4 Copyright © 2013 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <stdarg.h> | |
| 23 #include <stdio.h> | |
| 24 #include <stdlib.h> | |
| 25 #include <string.h> | |
| 26 | |
| 27 #include <lw_alloc.h> | |
| 28 #include <lw_string.h> | |
|
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29 #include <lw_stringlist.h> |
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30 #include <lw_strpool.h> |
| 295 | 31 #include "cpp.h" |
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32 |
| 295 | 33 |
| 34 struct token *preproc_lex_next_token(struct preproc_info *); | |
| 35 | |
| 36 struct preproc_info *preproc_init(const char *fn) | |
| 37 { | |
| 38 FILE *fp; | |
| 39 struct preproc_info *pp; | |
| 40 | |
| 41 if (!fn || (fn[0] == '-' && fn[1] == '0')) | |
| 42 { | |
| 43 fp = stdin; | |
| 44 } | |
| 45 else | |
| 46 { | |
| 47 fp = fopen(fn, "rb"); | |
| 48 } | |
| 49 if (!fp) | |
| 50 return NULL; | |
| 51 | |
| 52 pp = lw_alloc(sizeof(struct preproc_info)); | |
| 53 memset(pp, 0, sizeof(struct preproc_info)); | |
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54 pp -> strpool = lw_strpool_create(); |
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55 pp -> fn = lw_strpool_strdup(pp -> strpool, fn); |
| 295 | 56 pp -> fp = fp; |
| 57 pp -> ra = CPP_NOUNG; | |
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58 pp -> unget = CPP_NOUNG; |
| 296 | 59 pp -> ppeolseen = 1; |
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60 pp -> lineno = 1; |
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61 pp -> n = NULL; |
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62 pp -> quotelist = lw_stringlist_create(); |
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63 pp -> inclist = lw_stringlist_create(); |
| 295 | 64 return pp; |
| 65 } | |
| 66 | |
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67 void preproc_add_include(struct preproc_info *pp, char *dir, int sys) |
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68 { |
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69 if (sys) |
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70 lw_stringlist_addstring(pp -> inclist, dir); |
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71 else |
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72 lw_stringlist_addstring(pp -> quotelist, dir); |
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73 } |
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74 |
| 295 | 75 struct token *preproc_next_token(struct preproc_info *pp) |
| 76 { | |
| 77 struct token *t; | |
| 78 | |
| 296 | 79 if (pp -> curtok) |
| 80 token_free(pp -> curtok); | |
| 81 | |
| 82 /* | |
| 83 If there is a list of tokens to process, move it to the "unget" queue | |
| 84 with an EOF marker at the end of it. | |
| 85 */ | |
| 86 if (pp -> sourcelist) | |
| 87 { | |
| 88 for (t = pp -> sourcelist; t -> next; t = t -> next) | |
| 89 /* do nothing */ ; | |
| 90 t -> next = token_create(TOK_EOF, NULL, -1, -1, ""); | |
| 91 t -> next -> next = pp -> tokqueue; | |
| 92 pp -> tokqueue = pp -> sourcelist; | |
| 93 pp -> sourcelist = NULL; | |
| 94 } | |
| 95 again: | |
| 295 | 96 if (pp -> tokqueue) |
| 97 { | |
| 98 t = pp -> tokqueue; | |
| 99 pp -> tokqueue = t -> next; | |
| 100 if (pp -> tokqueue) | |
| 101 pp -> tokqueue -> prev = NULL; | |
| 102 t -> next = NULL; | |
| 103 t -> prev = NULL; | |
| 296 | 104 pp -> curtok = t; |
| 105 goto ret; | |
| 295 | 106 } |
| 296 | 107 pp -> curtok = preproc_lex_next_token(pp); |
| 108 t = pp -> curtok; | |
| 109 ret: | |
| 110 if (t -> ttype == TOK_ENDEXPAND) | |
| 111 { | |
| 112 struct expand_e *e; | |
| 113 e = pp -> expand_list; | |
| 114 pp -> expand_list = e -> next; | |
| 115 lw_free(e); | |
| 116 goto again; | |
| 117 } | |
| 118 return t; | |
| 119 } | |
| 120 | |
| 121 void preproc_unget_token(struct preproc_info *pp, struct token *t) | |
| 122 { | |
| 123 t -> next = pp -> tokqueue; | |
| 124 pp -> tokqueue = t; | |
| 125 if (pp -> curtok == t) | |
| 126 pp -> curtok = NULL; | |
| 295 | 127 } |
| 128 | |
| 129 void preproc_finish(struct preproc_info *pp) | |
| 130 { | |
| 131 fclose(pp -> fp); | |
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132 lw_stringlist_destroy(pp -> inclist); |
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133 lw_stringlist_destroy(pp -> quotelist); |
| 296 | 134 if (pp -> curtok) |
| 135 token_free(pp -> curtok); | |
| 136 while (pp -> tokqueue) | |
| 137 { | |
| 138 preproc_next_token(pp); | |
| 139 token_free(pp -> curtok); | |
| 140 } | |
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141 lw_strpool_free(pp -> strpool); |
| 295 | 142 lw_free(pp); |
| 143 } | |
| 144 | |
| 145 void preproc_register_error_callback(struct preproc_info *pp, void (*cb)(const char *)) | |
| 146 { | |
| 147 pp -> errorcb = cb; | |
| 148 } | |
| 149 | |
| 150 void preproc_register_warning_callback(struct preproc_info *pp, void (*cb)(const char *)) | |
| 151 { | |
| 152 pp -> warningcb = cb; | |
| 153 } | |
| 154 | |
| 155 static void preproc_throw_error_default(const char *m) | |
| 156 { | |
| 157 fprintf(stderr, "ERROR: %s\n", m); | |
| 158 } | |
| 159 | |
| 160 static void preproc_throw_warning_default(const char *m) | |
| 161 { | |
| 162 fprintf(stderr, "WARNING: %s\n", m); | |
| 163 } | |
| 164 | |
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165 static void preproc_throw_message(struct preproc_info *pp, void (*cb)(const char *), const char *m, va_list args) |
| 295 | 166 { |
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167 int s, s2; |
| 295 | 168 char *b; |
| 169 | |
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170 s2 = snprintf(NULL, 0, "(%s:%d:%d) ", pp -> fn, pp -> lineno, pp -> column); |
| 295 | 171 s = vsnprintf(NULL, 0, m, args); |
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172 b = lw_alloc(s + s2 + 1); |
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173 snprintf(b, s2 + 1, "(%s:%d:%d) ", pp -> fn, pp -> lineno, pp -> column); |
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174 vsnprintf(b + s2, s + 1, m, args); |
| 295 | 175 (*cb)(b); |
| 176 lw_free(b); | |
| 177 } | |
| 178 | |
| 179 void preproc_throw_error(struct preproc_info *pp, const char *m, ...) | |
| 180 { | |
| 181 va_list args; | |
| 182 va_start(args, m); | |
|
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183 preproc_throw_message(pp, pp -> errorcb ? pp -> errorcb : preproc_throw_error_default, m, args); |
| 295 | 184 va_end(args); |
| 185 exit(1); | |
| 186 } | |
| 187 | |
| 188 void preproc_throw_warning(struct preproc_info *pp, const char *m, ...) | |
| 189 { | |
| 190 va_list args; | |
| 191 va_start(args, m); | |
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192 preproc_throw_message(pp, pp -> warningcb ? pp -> warningcb : preproc_throw_warning_default, m, args); |
| 295 | 193 va_end(args); |
| 194 } |