1 /* Common parts between scan-code.l, scan-gram.l, and scan-skel.l. 2 3 Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc. 4 5 This file is part of Bison, the GNU Compiler Compiler. 6 7 This program is free software: you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation, either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #ifndef FLEX_PREFIX 21 # error "FLEX_PREFIX not defined" 22 #endif 23 24 /* Flex full version as a number. */ 25 #define FLEX_VERSION \ 26 ((YY_FLEX_MAJOR_VERSION) * 1000000 \ 27 + (YY_FLEX_MINOR_VERSION) * 1000 \ 28 + (YY_FLEX_SUBMINOR_VERSION)) 29 30 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used. */ 31 # if FLEX_VERSION <= 2005031 32 int FLEX_PREFIX (get_lineno) (void); 33 FILE *FLEX_PREFIX (get_in) (void); 34 FILE *FLEX_PREFIX (get_out) (void); 35 int FLEX_PREFIX (get_leng) (void); 36 char *FLEX_PREFIX (get_text) (void); 37 void FLEX_PREFIX (set_lineno) (int); 38 void FLEX_PREFIX (set_in) (FILE *); 39 void FLEX_PREFIX (set_out) (FILE *); 40 int FLEX_PREFIX (get_debug) (void); 41 void FLEX_PREFIX (set_debug) (int); 42 int FLEX_PREFIX (lex_destroy) (void); 43 #endif 44 45 #define last_string FLEX_PREFIX (last_string) 46 47 /* It seems to be a nice "feature" of Flex that one cannot use yytext, 48 yyleng etc. when a prefix is given, since there is no longer a 49 #define, but rather the token is actually changed in the output. 50 However, this is not true for Flex 2.5.4. */ 51 #ifndef yyleng 52 # define yyleng FLEX_PREFIX (leng) 53 #endif 54 #ifndef yytext 55 # define yytext FLEX_PREFIX (text) 56 #endif 57 58 /* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier 59 versions according to the Flex manual) leak memory if yylex_destroy is not 60 invoked. However, yylex_destroy is not defined before Flex 2.5.9, so give 61 an implementation here that at least appears to work with Flex 2.5.4. */ 62 #if FLEX_VERSION <= 2005009 63 # define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER) 64 #endif 65 66 /* OBSTACK_FOR_STRING -- Used to store all the characters that we need to 67 keep (to construct ID, STRINGS etc.). Use the following macros to 68 use it. 69 70 Use STRING_GROW to append what has just been matched, and 71 STRING_FINISH to end the string (it puts the ending 0). 72 STRING_FINISH also stores this string in LAST_STRING, which can be 73 used, and which is used by STRING_FREE to free the last string. */ 74 75 #ifndef FLEX_NO_OBSTACK 76 77 static struct obstack obstack_for_string; 78 79 # define STRING_GROW \ 80 obstack_grow (&obstack_for_string, yytext, yyleng) 81 82 # define STRING_FINISH \ 83 do { \ 84 obstack_1grow (&obstack_for_string, '\0'); \ 85 last_string = obstack_finish (&obstack_for_string); \ 86 } while (0) 87 88 # define STRING_FREE \ 89 obstack_free (&obstack_for_string, last_string) 90 91 #endif 92
