1 /* $NetBSD: lint1.h,v 1.16 2002/10/21 22:44:08 christos 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 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "lint.h" 38 #include "op.h" 39 40 /* XXX - works for most systems, but the whole ALIGN thing needs to go away */ 41 #ifndef LINT_ALIGN 42 #define LINT_ALIGN(x) (((x) + 15) & ~15) 43 #endif 44 45 /* 46 * Describes the position of a declaration or anything else. 47 */ 48 typedef struct { 49 int p_line; 50 const char *p_file; 51 int p_uniq; /* uniquifier */ 52 } pos_t; 53 54 /* Copies curr_pos, keeping things unique. */ 55 #define UNIQUE_CURR_POS(pos) \ 56 do { \ 57 STRUCT_ASSIGN((pos), curr_pos); \ 58 curr_pos.p_uniq++; \ 59 if (curr_pos.p_file == csrc_pos.p_file) \ 60 csrc_pos.p_uniq++; \ 61 } while (0) 62 63 /* 64 * Strings cannot be referenced to simply by a pointer to its first 65 * char. This is because strings can contain NUL characters other than the 66 * trailing NUL. 67 * 68 * Strings are stored with a trailing NUL. 69 */ 70 typedef struct strg { 71 tspec_t st_tspec; /* CHAR or WCHAR */ 72 size_t st_len; /* length without trailing NUL */ 73 union { 74 u_char *_st_cp; 75 wchar_t *_st_wcp; 76 } st_u; 77 } strg_t; 78 79 #define st_cp st_u._st_cp 80 #define st_wcp st_u._st_wcp 81 82 /* 83 * qualifiers (only for lex/yacc interface) 84 */ 85 typedef enum { 86 CONST, VOLATILE 87 } tqual_t; 88 89 /* 90 * Integer and floating point values are stored in this structure 91 */ 92 typedef struct { 93 tspec_t v_tspec; 94 int v_ansiu; /* set if an integer constant is 95 unsigned in ANSI C */ 96 union { 97 int64_t _v_quad; /* integers */ 98 ldbl_t _v_ldbl; /* floats */ 99 } v_u; 100 } val_t; 101 102 #define v_quad v_u._v_quad 103 #define v_ldbl v_u._v_ldbl 104 105 /* 106 * Structures of type str_t uniqely identify structures. This can't 107 * be done in structures of type type_t, because these are copied 108 * if they must be modified. So it would not be possible to check 109 * if two structures are identical by comparing the pointers to 110 * the type structures. 111 * 112 * The typename is used if the structure is unnamed to identify 113 * the structure type in pass 2. 114 */ 115 typedef struct { 116 u_int size; /* size in bit */ 117 u_int align : 15; /* alignment in bit */ 118 u_int sincompl : 1; /* set if incomplete type */ 119 struct sym *memb; /* list of members */ 120 struct sym *stag; /* symbol table entry of tag */ 121 struct sym *stdef; /* symbol table entry of first typename */ 122 } str_t; 123 124 /* 125 * same as above for enums 126 */ 127 typedef struct { 128 u_int eincompl : 1; /* incomplete enum type */ 129 struct sym *elem; /* list of enumerators */ 130 struct sym *etag; /* symbol table entry of tag */ 131 struct sym *etdef; /* symbol table entry of first typename */ 132 } enum_t; 133 134 /* 135 * Types are represented by concatenation of structures of type type_t 136 * via t_subt. 137 */ 138 typedef struct type { 139 tspec_t t_tspec; /* type specifier */ 140 u_int t_aincompl : 1; /* incomplete array type */ 141 u_int t_const : 1; /* const modifier */ 142 u_int t_volatile : 1; /* volatile modifier */ 143 u_int t_proto : 1; /* function prototype (t_args valid) */ 144 u_int t_vararg : 1; /* prototype with ... */ 145 u_int t_typedef : 1; /* type defined with typedef */ 146 u_int t_isfield : 1; /* type is bitfield */ 147 u_int t_isenum : 1; /* type is (or was) enum (t_enum valid) */ 148 union { 149 int _t_dim; /* dimension */ 150 str_t *_t_str; /* struct/union tag */ 151 enum_t *_t_enum; /* enum tag */ 152 struct sym *_t_args; /* arguments (if t_proto) */ 153 } t_u; 154 struct { 155 u_int _t_flen : 8; /* length of bit-field */ 156 u_int _t_foffs : 24; /* offset of bit-field */ 157 } t_b; 158 struct type *t_subt; /* element type (arrays), return value 159 (functions), or type pointer points to */ 160 } type_t; 161 162 #define t_dim t_u._t_dim 163 #define t_str t_u._t_str 164 #define t_field t_u._t_field 165 #define t_enum t_u._t_enum 166 #define t_args t_u._t_args 167 #define t_flen t_b._t_flen 168 #define t_foffs t_b._t_foffs 169 170 /* 171 * types of symbols 172 */ 173 typedef enum { 174 FVFT, /* variables, functions, type names, enums */ 175 FMOS, /* members of structs or unions */ 176 FTAG, /* tags */ 177 FLAB /* labels */ 178 } symt_t; 179 180 /* 181 * storage classes 182 */ 183 typedef enum { 184 NOSCL, 185 EXTERN, /* external symbols (indep. of decl_t) */ 186 STATIC, /* static symbols (local and global) */ 187 AUTO, /* automatic symbols (except register) */ 188 REG, /* register */ 189 TYPEDEF, /* typedef */ 190 STRTAG, 191 UNIONTAG, 192 ENUMTAG, 193 MOS, /* member of struct */ 194 MOU, /* member of union */ 195 ENUMCON, /* enumerator */ 196 ABSTRACT, /* abstract symbol (sizeof, casts, unnamed argument) */ 197 ARG, /* argument */ 198 PARG, /* used in declaration stack during prototype 199 declaration */ 200 INLINE /* only used by the parser */ 201 } scl_t; 202 203 /* 204 * symbol table entry 205 */ 206 typedef struct sym { 207 const char *s_name; /* name */ 208 const char *s_rename; /* renamed symbol's given name */ 209 pos_t s_dpos; /* position of last (prototype)definition, 210 prototypedeclaration, no-prototype-def., 211 tentative definition or declaration, 212 in this order */ 213 pos_t s_spos; /* position of first initialisation */ 214 pos_t s_upos; /* position of first use */ 215 symt_t s_kind; /* type of symbol */ 216 u_int s_keyw : 1; /* keyword */ 217 u_int s_field : 1; /* bit-field */ 218 u_int s_set : 1; /* variable set, label defined */ 219 u_int s_used : 1; /* variable/label used */ 220 u_int s_arg : 1; /* symbol is function argument */ 221 u_int s_reg : 1; /* symbol is register variable */ 222 u_int s_defarg : 1; /* undefined symbol in old style function 223 definition */ 224 u_int s_rimpl : 1; /* return value of function implicit decl. */ 225 u_int s_osdef : 1; /* symbol stems from old style function def. */ 226 u_int s_inline : 1; /* true if this is an inline function */ 227 struct sym *s_xsym; /* for local declared external symbols pointer 228 to external symbol with same name */ 229 def_t s_def; /* declared, tentative defined, defined */ 230 scl_t s_scl; /* storage class */ 231 int s_blklev; /* level of declaration, -1 if not in symbol 232 table */ 233 type_t *s_type; /* type */ 234 val_t s_value; /* value (if enumcon) */ 235 union { 236 str_t *_s_st; /* tag, if it is a struct/union member */ 237 enum_t *_s_et; /* tag, if it is an enumerator */ 238 tspec_t _s_tsp; /* type (only for keywords) */ 239 tqual_t _s_tqu; /* qualifier (only for keywords) */ 240 struct sym *_s_args; /* arguments in old style function 241 definitions */ 242 } u; 243 struct sym *s_link; /* next symbol with same hash value */ 244 struct sym **s_rlink; /* pointer to s_link of prev. symbol */ 245 struct sym *s_nxt; /* next struct/union member, enumerator, 246 argument */ 247 struct sym *s_dlnxt; /* next symbol declared on same level */ 248 } sym_t; 249 250 #define s_styp u._s_st 251 #define s_etyp u._s_et 252 #define s_tspec u._s_tsp 253 #define s_tqual u._s_tqu 254 #define s_args u._s_args 255 256 /* 257 * Used to keep some informations about symbols before they are entered 258 * into the symbol table. 259 */ 260 typedef struct sbuf { 261 const char *sb_name; /* name of symbol */ 262 size_t sb_len; /* length (without '\0') */ 263 int sb_hash; /* hash value */ 264 sym_t *sb_sym; /* symbol table entry */ 265 struct sbuf *sb_nxt; /* for freelist */ 266 } sbuf_t; 267 268 269 /* 270 * tree node 271 */ 272 typedef struct tnode { 273 op_t tn_op; /* operator */ 274 type_t *tn_type; /* type */ 275 u_int tn_lvalue : 1; /* node is lvalue */ 276 u_int tn_cast : 1; /* if tn_op == CVT its an explizit cast */ 277 u_int tn_parn : 1; /* node parenthesized */ 278 union { 279 struct { 280 struct tnode *_tn_left; /* (left) operand */ 281 struct tnode *_tn_right; /* right operand */ 282 } tn_s; 283 sym_t *_tn_sym; /* symbol if op == NAME */ 284 val_t *_tn_val; /* value if op == CON */ 285 strg_t *_tn_strg; /* string if op == STRING */ 286 } tn_u; 287 } tnode_t; 288 289 #define tn_left tn_u.tn_s._tn_left 290 #define tn_right tn_u.tn_s._tn_right 291 #define tn_sym tn_u._tn_sym 292 #define tn_val tn_u._tn_val 293 #define tn_strg tn_u._tn_strg 294 295 /* 296 * For nested declarations a stack exists, which holds all information 297 * needed for the current level. dcs points to the top element of this 298 * stack. 299 * 300 * ctx describes the context of the current declaration. Its value is 301 * one of 302 * EXTERN global declarations 303 * MOS oder MOU declarations of struct or union members 304 * ENUMCON declarations of enums 305 * ARG declaration of arguments in old style function definitions 306 * PARG declaration of arguments in function prototypes 307 * AUTO declaration of local symbols 308 * ABSTRACT abstract declarations (sizeof, casts) 309 * 310 */ 311 typedef struct dinfo { 312 tspec_t d_atyp; /* VOID, CHAR, INT, FLOAT or DOUBLE */ 313 tspec_t d_smod; /* SIGNED or UNSIGN */ 314 tspec_t d_lmod; /* SHORT, LONG or QUAD */ 315 scl_t d_scl; /* storage class */ 316 type_t *d_type; /* after deftyp() pointer to the type used 317 for all declarators */ 318 sym_t *d_rdcsym; /* redeclared symbol */ 319 int d_offset; /* offset of next structure member */ 320 int d_stralign; /* alignment required for current structure */ 321 scl_t d_ctx; /* context of declaration */ 322 u_int d_const : 1; /* const in declaration specifiers */ 323 u_int d_volatile : 1; /* volatile in declaration specifiers */ 324 u_int d_inline : 1; /* inline in declaration specifiers */ 325 u_int d_mscl : 1; /* multiple storage classes */ 326 u_int d_terr : 1; /* invalid type combination */ 327 u_int d_nedecl : 1; /* 1 if at least a tag is declared */ 328 u_int d_vararg : 1; /* ... in current function decl. */ 329 u_int d_proto : 1; /* current funct. decl. is prototype */ 330 u_int d_notyp : 1; /* set if no type specifier was present */ 331 u_int d_asm : 1; /* set if d_ctx == AUTO and asm() present */ 332 type_t *d_tagtyp; /* tag during member declaration */ 333 sym_t *d_fargs; /* list of arguments during function def. */ 334 pos_t d_fdpos; /* position of function definition */ 335 sym_t *d_dlsyms; /* first symbol declared at this level */ 336 sym_t **d_ldlsym; /* points to s_dlnxt in last symbol decl. 337 at this level */ 338 sym_t *d_fpsyms; /* symbols defined in prototype */ 339 struct dinfo *d_nxt; /* next level */ 340 } dinfo_t; 341 342 /* 343 * Type of stack which is used for initialisation of aggregate types. 344 */ 345 typedef struct istk { 346 type_t *i_type; /* type of initialisation */ 347 type_t *i_subt; /* type of next level */ 348 u_int i_brace : 1; /* need } for pop */ 349 u_int i_nolimit : 1; /* incomplete array type */ 350 u_int i_namedmem : 1; /* has c9x named members */ 351 sym_t *i_mem; /* next structure member */ 352 int i_cnt; /* # of remaining elements */ 353 struct istk *i_nxt; /* previous level */ 354 } istk_t; 355 356 /* 357 * Used to collect information about pointers and qualifiers in 358 * declarators. 359 */ 360 typedef struct pqinf { 361 int p_pcnt; /* number of asterisks */ 362 u_int p_const : 1; 363 u_int p_volatile : 1; 364 struct pqinf *p_nxt; 365 } pqinf_t; 366 367 /* 368 * Case values are stored in a list of type clst_t. 369 */ 370 typedef struct clst { 371 val_t cl_val; 372 struct clst *cl_nxt; 373 } clst_t; 374 375 /* 376 * Used to keep informations about nested control statements. 377 */ 378 typedef struct cstk { 379 int c_env; /* type of statement (T_IF, ...) */ 380 u_int c_loop : 1; /* continue && break are valid */ 381 u_int c_switch : 1; /* case && break are valid */ 382 u_int c_break : 1; /* loop/switch has break */ 383 u_int c_cont : 1; /* loop has continue */ 384 u_int c_default : 1; /* switch has default */ 385 u_int c_infinite : 1; /* break condition always false 386 (for (;;), while (1)) */ 387 u_int c_rchif : 1; /* end of if-branch reached */ 388 u_int c_noretval : 1; /* had "return;" */ 389 u_int c_retval : 1; /* had "return (e);" */ 390 type_t *c_swtype; /* type of switch expression */ 391 clst_t *c_clst; /* list of case values */ 392 struct mbl *c_fexprm; /* saved memory for end of loop 393 expression in for() */ 394 tnode_t *c_f3expr; /* end of loop expr in for() */ 395 pos_t c_fpos; /* position of end of loop expr */ 396 pos_t c_cfpos; /* same for csrc_pos */ 397 struct cstk *c_nxt; /* outer control statement */ 398 } cstk_t; 399 400 typedef struct { 401 size_t lo; 402 size_t hi; 403 } range_t; 404 405 #include "externs1.h" 406 407 #define ERR_SETSIZE 1024 408 #define __NERRBITS (sizeof(unsigned int)) 409 410 typedef struct err_set { 411 unsigned int errs_bits[(ERR_SETSIZE + __NERRBITS-1) / __NERRBITS]; 412 } err_set; 413 414 #define ERR_SET(n, p) \ 415 ((p)->errs_bits[(n)/__NERRBITS] |= (1 << ((n) % __NERRBITS))) 416 #define ERR_CLR(n, p) \ 417 ((p)->errs_bits[(n)/__NERRBITS] &= ~(1 << ((n) % __NERRBITS))) 418 #define ERR_ISSET(n, p) \ 419 ((p)->errs_bits[(n)/__NERRBITS] & (1 << ((n) % __NERRBITS))) 420 #define ERR_ZERO(p) (void)memset((p), 0, sizeof(*(p))) 421 422 #define LERROR(fmt, args...) lerror(__FILE__, __LINE__, fmt, ##args) 423 424 extern err_set msgset; 425