1 /* $NetBSD: lint2.h,v 1.28 2025/02/27 06:48:29 rillig Exp $ */
2
3 /*
4 * Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved.
5 * Copyright (c) 1994, 1995 Jochen Pohl
6 * All Rights Reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Jochen Pohl for
19 * The NetBSD Project.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include "lint.h"
36
37 /*
38 * Types are described by structures of type type_t.
39 */
40 struct lint2_type {
41 tspec_t t_tspec; /* type specifier */
42 bool t_const:1; /* constant */
43 bool t_volatile:1; /* volatile */
44 bool t_vararg:1; /* function has variable number of arguments */
45 bool t_is_enum:1;
46 bool t_proto:1; /* this is a prototype */
47 bool t_istag:1; /* tag with _t_tag valid */
48 bool t_istynam:1; /* tag with _t_tynam valid */
49 bool t_isuniqpos:1; /* tag with _t_uniqpos valid */
50 union {
51 int _t_dim; /* if the type is an ARRAY than this
52 * is the dimension of the array. */
53 struct hte *_t_tag; /* hash table entry of tag if
54 * t_is_enum, STRUCT or UNION */
55 struct hte *_t_tynam; /* hash table entry of typename if
56 * t_is_enum, STRUCT or UNION */
57 struct {
58 int p_line;
59 short p_file;
60 int p_uniq;
61 } _t_uniqpos; /* unique position, for untagged
62 * untyped STRUCTs, UNIONS, and ENUMs,
63 * if t_isuniqpos */
64 struct lint2_type **_t_args; /* list of argument types if
65 * this is a prototype */
66 } t_u;
67 struct lint2_type *t_subt; /*- element type (if ARRAY),
68 * return type (if FUNC),
69 * target type (if PTR) */
70 };
71
72 #define t_dim t_u._t_dim
73 #define t_tag t_u._t_tag
74 #define t_tynam t_u._t_tynam
75 #define t_uniqpos t_u._t_uniqpos
76 #define t_args t_u._t_args
77
78 /*
79 * argument information
80 *
81 * Such a structure is created for each argument of a function call
82 * which is an integer constant or a constant string.
83 */
84 typedef struct arginf {
85 int a_num; /* # of argument (1..) */
86 bool a_zero:1; /* argument is 0 */
87 bool a_pcon:1; /* msb of argument is not set */
88 bool a_ncon:1; /* msb of argument is set */
89 bool a_fmt:1; /* a_fstrg points to format string */
90 char *a_fstrg; /* format string */
91 struct arginf *a_next; /* information for next const. argument */
92 } arginf_t;
93
94 /*
95 * Keeps information about position in source file.
96 */
97 typedef struct {
98 unsigned short p_src; /* index of name of translation unit (the name
99 * which was specified at the command line) */
100 unsigned short p_line; /* line number in p_src */
101 unsigned short p_isrc; /* index of (included) file */
102 unsigned short p_iline; /* line number in p_iline */
103 } pos_t;
104
105 /* Used for definitions and declarations. */
106 typedef struct sym {
107 struct {
108 pos_t s_pos; /* pos of def./decl. */
109 #if !defined(lint) && !defined(DEBUG)
110 unsigned char s_def; /* DECL, TDEF or DEF */
111 #else
112 def_t s_def;
113 #endif
114 bool s_function_has_return_value:1;
115 bool s_inline:1;
116 bool s_old_style_function:1;
117 bool s_static:1;
118 bool s_check_only_first_args:1;
119 bool s_printflike:1;
120 bool s_scanflike:1;
121 unsigned short s_type;
122 struct sym *s_next; /* next symbol with same name */
123 } s_s;
124 /*
125 * To save memory, the remaining members are only allocated if one of
126 * s_check_only_first_args, s_printflike and s_scanflike is set.
127 */
128 short s_check_num_args; /* if s_check_only_first_args */
129 short s_printflike_arg; /* if s_printflike */
130 short s_scanflike_arg; /* if s_scanflike */
131 } sym_t;
132
133 #define s_pos s_s.s_pos
134 #define s_function_has_return_value s_s.s_function_has_return_value
135 #define s_old_style_function s_s.s_old_style_function
136 #define s_inline s_s.s_inline
137 #define s_static s_s.s_static
138 #define s_def s_s.s_def
139 #define s_check_only_first_args s_s.s_check_only_first_args
140 #define s_printflike s_s.s_printflike
141 #define s_scanflike s_s.s_scanflike
142 #define s_type s_s.s_type
143 #define s_next s_s.s_next
144
145 /*
146 * Used to store information about function calls.
147 */
148 typedef struct fcall {
149 pos_t f_pos; /* position of call */
150 bool f_rused:1; /* return value used */
151 bool f_rdisc:1; /* return value discarded (casted to void) */
152 unsigned short f_type; /* types of expected return value and args */
153 arginf_t *f_args; /* information about constant arguments */
154 struct fcall *f_next; /* next call of same function */
155 } fcall_t;
156
157 /*
158 * Used to store information about usage of symbols other
159 * than for function calls.
160 */
161 typedef struct usym {
162 pos_t u_pos; /* position */
163 struct usym *u_next; /* next usage */
164 } usym_t;
165
166 /*
167 * hash table entry
168 */
169 typedef struct hte {
170 const char *h_name; /* name */
171 bool h_used:1; /* symbol is used */
172 bool h_def:1; /* symbol is defined */
173 bool h_static:1; /* static symbol */
174 sym_t *h_syms; /* declarations and definitions */
175 sym_t **h_lsym; /* points to s_next of last decl./def. */
176 fcall_t *h_calls; /* function calls */
177 fcall_t **h_lcall; /* points to f_next of last call */
178 usym_t *h_usyms; /* usage info */
179 usym_t **h_lusym; /* points to u_next of last usage info */
180 struct hte *h_link; /* next hte with same hash function */
181 struct hte *h_hte; /* pointer to other htes (for renames) */
182 } hte_t;
183
184 #include "externs2.h"
185
186 /* maps type indices into pointers to type structs */
187 static inline type_t *
TP(unsigned short type_id)188 TP(unsigned short type_id)
189 {
190 /* force sequence point for newly parsed type_id */
191 return tlst[type_id];
192 }
193