1/* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
2
3 Copyright (C) 2006, 2009-2015, 2018-2019 Free Software Foundation,
4 Inc.
5
6 This file is part of Bison, the GNU Compiler Compiler.
7
8 This program is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21#ifndef FLEX_PREFIX
22# error "FLEX_PREFIX not defined"
23#endif
24
25/* Flex full version as a number. */
26#define FLEX_VERSION \
27 ((YY_FLEX_MAJOR_VERSION) * 1000000 \
28 + (YY_FLEX_MINOR_VERSION) * 1000 \
29 + (YY_FLEX_SUBMINOR_VERSION))
30
31// Pacify warnings in yy_init_buffer (observed with Flex 2.6.4 and GCC
32// 6.4.0 and 7.3.0).
33//
34// ./src/scan-skel.c: In function 'skel_restart':
35// ./src/scan-skel.c:2035:20: error: potential null pointer dereference [-Werror=null-dereference]
36// b->yy_fill_buffer = 1;
37// ~~~~~~~~~~~~~~~~~~^~~
38// ./src/scan-skel.c:2031:19: error: potential null pointer dereference [-Werror=null-dereference]
39// b->yy_input_file = file;
40// ~~~~~~~~~~~~~~~~~^~~~~~
41#if defined __GNUC__ && ! defined __clang__ && 6 <= __GNUC__
42# pragma GCC diagnostic ignored "-Wnull-dereference"
43#endif
44
45// Old versions of Flex (2.5.35) generate an incomplete documentation comment.
46//
47// In file included from src/scan-code-c.c:3:
48// src/scan-code.c:2198:21: error: empty paragraph passed to '@param' command
49// [-Werror,-Wdocumentation]
50// * @param line_number
51// ~~~~~~~~~~~~~~~~~^
52// 1 error generated.
53#if FLEX_VERSION <= 20060000 && defined __clang__
54# pragma clang diagnostic ignored "-Wdocumentation"
55#endif
56
57/* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used. */
58#if FLEX_VERSION <= 2005031
59int FLEX_PREFIX (get_lineno) (void);
60FILE *FLEX_PREFIX (get_in) (void);
61FILE *FLEX_PREFIX (get_out) (void);
62int FLEX_PREFIX (get_leng) (void);
63char *FLEX_PREFIX (get_text) (void);
64void FLEX_PREFIX (set_lineno) (int);
65void FLEX_PREFIX (set_in) (FILE *);
66void FLEX_PREFIX (set_out) (FILE *);
67int FLEX_PREFIX (get_debug) (void);
68void FLEX_PREFIX (set_debug) (int);
69int FLEX_PREFIX (lex_destroy) (void);
70#endif
71
72#define last_string FLEX_PREFIX (last_string)
73
74/* It seems to be a nice "feature" of Flex that one cannot use yytext,
75 yyleng etc. when a prefix is given, since there is no longer a
76 #define, but rather the token is actually changed in the output.
77 However, this is not true for Flex 2.5.4. */
78#ifndef yyleng
79# define yyleng FLEX_PREFIX (leng)
80#endif
81#ifndef yytext
82# define yytext FLEX_PREFIX (text)
83#endif
84
85/* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier
86 versions according to the Flex manual) leak memory if yylex_destroy is not
87 invoked. However, yylex_destroy is not defined before Flex 2.5.9, so give
88 an implementation here that at least appears to work with Flex 2.5.4. */
89#if FLEX_VERSION <= 2005009
90# define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
91#endif
92
93/* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
94 keep (to construct ID, STRINGS etc.). Use the following macros to
95 use it.
96
97 Use STRING_GROW to append what has just been matched, and
98 STRING_FINISH to end the string (it puts the ending 0).
99 STRING_FINISH also stores this string in LAST_STRING, which can be
100 used, and which is used by STRING_FREE to free the last string. */
101
102#ifndef FLEX_NO_OBSTACK
103
104static struct obstack obstack_for_string;
105
106# define STRING_GROW \
107 obstack_grow (&obstack_for_string, yytext, yyleng)
108
109# define STRING_FINISH \
110 (last_string = obstack_finish0 (&obstack_for_string))
111
112# define STRING_FREE \
113 obstack_free (&obstack_for_string, last_string)
114
115#endif
116