1 %{ 2 /* 3 * Copyright 2010 Intel Corporation 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 */ 24 25 #include <stdio.h> 26 #include <string.h> 27 #include <ctype.h> 28 29 #include "glcpp.h" 30 #include "glcpp-parse.h" 31 32 /* Flex annoyingly generates some functions without making them 33 * static. Let's declare them here. */ 34 int glcpp_get_column (yyscan_t yyscanner); 35 void glcpp_set_column (int column_no , yyscan_t yyscanner); 36 37 #ifdef _MSC_VER 38 #define YY_NO_UNISTD_H 39 #endif 40 41 #define YY_NO_INPUT 42 43 #define YY_USER_ACTION \ 44 do { \ 45 if (parser->has_new_line_number) \ 46 yylineno = parser->new_line_number; \ 47 if (parser->has_new_source_number) \ 48 yylloc->source = parser->new_source_number; \ 49 yylloc->first_column = yycolumn + 1; \ 50 yylloc->first_line = yylineno; \ 51 yycolumn += yyleng; \ 52 parser->has_new_line_number = 0; \ 53 parser->has_new_source_number = 0; \ 54 } while(0); 55 56 #define YY_USER_INIT \ 57 do { \ 58 yylineno = 1; \ 59 yycolumn = 1; \ 60 yylloc->source = 0; \ 61 } while(0) 62 %} 63 64 %option bison-bridge bison-locations reentrant noyywrap 65 %option extra-type="glcpp_parser_t *" 66 %option prefix="glcpp_" 67 %option stack 68 %option never-interactive 69 70 %x DONE COMMENT UNREACHABLE SKIP DEFINE 71 72 SPACE [[:space:]] 73 NONSPACE [^[:space:]] 74 NEWLINE [\n] 75 HSPACE [ \t] 76 HASH ^{HSPACE}*#{HSPACE}* 77 IDENTIFIER [_a-zA-Z][_a-zA-Z0-9]* 78 PUNCTUATION [][(){}.&*~!/%<>^|;,=+-] 79 80 /* The OTHER class is simply a catch-all for things that the CPP 81 parser just doesn't care about. Since flex regular expressions that 82 match longer strings take priority over those matching shorter 83 strings, we have to be careful to avoid OTHER matching and hiding 84 something that CPP does care about. So we simply exclude all 85 characters that appear in any other expressions. */ 86 87 OTHER [^][_#[:space:]#a-zA-Z0-9(){}.&*~!/%<>^|;,=+-] 88 89 DIGITS [0-9][0-9]* 90 DECIMAL_INTEGER [1-9][0-9]*[uU]? 91 OCTAL_INTEGER 0[0-7]*[uU]? 92 HEXADECIMAL_INTEGER 0[xX][0-9a-fA-F]+[uU]? 93 94 %% 95 /* Implicitly switch between SKIP and INITIAL (non-skipping); 96 * don't switch if some other state was explicitly set. 97 */ 98 glcpp_parser_t *parser = yyextra; 99 if (YY_START == 0 || YY_START == SKIP) { 100 if (parser->lexing_if || parser->skip_stack == NULL || parser->skip_stack->type == SKIP_NO_SKIP) { 101 BEGIN 0; 102 } else { 103 BEGIN SKIP; 104 } 105 } 106 107 /* Single-line comments */ 108 "//"[^\n]* { 109 } 110 111 /* Multi-line comments */ 112 "/*" { yy_push_state(COMMENT, yyscanner); } 113 <COMMENT>[^*\n]* 114 <COMMENT>[^*\n]*\n { yylineno++; yycolumn = 0; return NEWLINE; } 115 <COMMENT>"*"+[^*/\n]* 116 <COMMENT>"*"+[^*/\n]*\n { yylineno++; yycolumn = 0; return NEWLINE; } 117 <COMMENT>"*"+"/" { 118 yy_pop_state(yyscanner); 119 if (yyextra->space_tokens) 120 return SPACE; 121 } 122 123 {HASH}version { 124 yylval->str = ralloc_strdup (yyextra, yytext); 125 yyextra->space_tokens = 0; 126 return HASH_VERSION; 127 } 128 129 /* glcpp doesn't handle #extension, #version, or #pragma directives. 130 * Simply pass them through to the main compiler's lexer/parser. */ 131 {HASH}(extension|pragma)[^\n]+ { 132 yylval->str = ralloc_strdup (yyextra, yytext); 133 yylineno++; 134 yycolumn = 0; 135 return OTHER; 136 } 137 138 {HASH}line { 139 return HASH_LINE; 140 } 141 142 <SKIP,INITIAL>{ 143 {HASH}ifdef { 144 yyextra->lexing_if = 1; 145 yyextra->space_tokens = 0; 146 return HASH_IFDEF; 147 } 148 149 {HASH}ifndef { 150 yyextra->lexing_if = 1; 151 yyextra->space_tokens = 0; 152 return HASH_IFNDEF; 153 } 154 155 {HASH}if/[^_a-zA-Z0-9] { 156 yyextra->lexing_if = 1; 157 yyextra->space_tokens = 0; 158 return HASH_IF; 159 } 160 161 {HASH}elif { 162 yyextra->lexing_if = 1; 163 yyextra->space_tokens = 0; 164 return HASH_ELIF; 165 } 166 167 {HASH}else { 168 yyextra->space_tokens = 0; 169 return HASH_ELSE; 170 } 171 172 {HASH}endif { 173 yyextra->space_tokens = 0; 174 return HASH_ENDIF; 175 } 176 } 177 178 <SKIP>[^\n] ; 179 180 {HASH}error.* { 181 char *p; 182 for (p = yytext; !isalpha(p[0]); p++); /* skip " # " */ 183 p += 5; /* skip "error" */ 184 glcpp_error(yylloc, yyextra, "#error%s", p); 185 } 186 187 {HASH}define{HSPACE}+ { 188 yyextra->space_tokens = 0; 189 yy_push_state(DEFINE, yyscanner); 190 return HASH_DEFINE; 191 } 192 193 <DEFINE>{IDENTIFIER}/"(" { 194 yy_pop_state(yyscanner); 195 yylval->str = ralloc_strdup (yyextra, yytext); 196 return FUNC_IDENTIFIER; 197 } 198 199 <DEFINE>{IDENTIFIER} { 200 yy_pop_state(yyscanner); 201 yylval->str = ralloc_strdup (yyextra, yytext); 202 return OBJ_IDENTIFIER; 203 } 204 205 {HASH}undef { 206 yyextra->space_tokens = 0; 207 return HASH_UNDEF; 208 } 209 210 {HASH} { 211 yyextra->space_tokens = 0; 212 return HASH; 213 } 214 215 {DECIMAL_INTEGER} { 216 yylval->str = ralloc_strdup (yyextra, yytext); 217 return INTEGER_STRING; 218 } 219 220 {OCTAL_INTEGER} { 221 yylval->str = ralloc_strdup (yyextra, yytext); 222 return INTEGER_STRING; 223 } 224 225 {HEXADECIMAL_INTEGER} { 226 yylval->str = ralloc_strdup (yyextra, yytext); 227 return INTEGER_STRING; 228 } 229 230 "<<" { 231 return LEFT_SHIFT; 232 } 233 234 ">>" { 235 return RIGHT_SHIFT; 236 } 237 238 "<=" { 239 return LESS_OR_EQUAL; 240 } 241 242 ">=" { 243 return GREATER_OR_EQUAL; 244 } 245 246 "==" { 247 return EQUAL; 248 } 249 250 "!=" { 251 return NOT_EQUAL; 252 } 253 254 "&&" { 255 return AND; 256 } 257 258 "||" { 259 return OR; 260 } 261 262 "##" { 263 return PASTE; 264 } 265 266 "defined" { 267 return DEFINED; 268 } 269 270 {IDENTIFIER} { 271 yylval->str = ralloc_strdup (yyextra, yytext); 272 return IDENTIFIER; 273 } 274 275 {PUNCTUATION} { 276 return yytext[0]; 277 } 278 279 {OTHER}+ { 280 yylval->str = ralloc_strdup (yyextra, yytext); 281 return OTHER; 282 } 283 284 {HSPACE}+ { 285 if (yyextra->space_tokens) { 286 return SPACE; 287 } 288 } 289 290 <SKIP,INITIAL>\n { 291 yyextra->lexing_if = 0; 292 yylineno++; 293 yycolumn = 0; 294 return NEWLINE; 295 } 296 297 /* Handle missing newline at EOF. */ 298 <INITIAL><<EOF>> { 299 BEGIN DONE; /* Don't keep matching this rule forever. */ 300 yyextra->lexing_if = 0; 301 return NEWLINE; 302 } 303 304 /* We don't actually use the UNREACHABLE start condition. We 305 only have this action here so that we can pretend to call some 306 generated functions, (to avoid "defined but not used" 307 warnings. */ 308 <UNREACHABLE>. { 309 unput('.'); 310 yy_top_state(yyextra); 311 } 312 313 %% 314 315 void 316 glcpp_lex_set_source_string(glcpp_parser_t *parser, const char *shader) 317 { 318 yy_scan_string(shader, parser->scanner); 319 } 320
