smatch.h

   1 /*
   2  * Copyright (C) 2006 Dan Carpenter.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #ifndef         SMATCH_H_
  19 # define        SMATCH_H_
  20
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <limits.h>
  24 #include <sys/time.h>
  25 #include "lib.h"
  26 #include "allocate.h"
  27 #include "scope.h"
  28 #include "parse.h"
  29 #include "expression.h"
  30 #include "avl.h"
  31
  32 typedef struct {
  33         struct symbol *type;
  34         union {
  35                 long long value;
  36                 unsigned long long uvalue;
  37         };
  38 } sval_t;
  39
  40 typedef long long mtag_t;
  41
  42 struct smatch_state {
  43         const char *name;
  44         void *data;
  45 };
  46 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  47 extern struct smatch_state undefined;
  48 extern struct smatch_state ghost;
  49 extern struct smatch_state merged;
  50 extern struct smatch_state true_state;
  51 extern struct smatch_state false_state;
  52 DECLARE_ALLOCATOR(smatch_state);
  53
  54 static inline void *INT_PTR(int i)
  55 {
  56         return (void *)(long)i;
  57 }
  58
  59 static inline int PTR_INT(void *p)
  60 {
  61         return (int)(long)p;
  62 }
  63
  64 struct tracker {
  65         char *name;
  66         struct symbol *sym;
  67         unsigned short owner;
  68 };
  69 DECLARE_ALLOCATOR(tracker);
  70 DECLARE_PTR_LIST(tracker_list, struct tracker);
  71 DECLARE_PTR_LIST(stree_stack, struct stree);
  72
  73 /* The first 3 struct members must match struct tracker */
  74 struct sm_state {
  75         const char *name;
  76         struct symbol *sym;
  77         unsigned short owner;
  78         unsigned short merged:1;
  79         unsigned short skip_implications:1;
  80         unsigned int nr_children;
  81         unsigned int line;
  82         struct smatch_state *state;
  83         struct stree *pool;
  84         struct sm_state *left;
  85         struct sm_state *right;
  86         struct state_list *possible;
  87 };
  88
  89 struct var_sym {
  90         char *var;
  91         struct symbol *sym;
  92 };
  93 DECLARE_ALLOCATOR(var_sym);
  94 DECLARE_PTR_LIST(var_sym_list, struct var_sym);
  95
  96 struct constraint {
  97         int op;
  98         int id;
  99 };
 100 DECLARE_PTR_LIST(constraint_list, struct constraint);
 101
 102 enum hook_type {
 103         EXPR_HOOK,
 104         STMT_HOOK,
 105         STMT_HOOK_AFTER,
 106         SYM_HOOK,
 107         STRING_HOOK,
 108         DECLARATION_HOOK,
 109         ASSIGNMENT_HOOK,
 110         ASSIGNMENT_HOOK_AFTER,
 111         RAW_ASSIGNMENT_HOOK,
 112         GLOBAL_ASSIGNMENT_HOOK,
 113         LOGIC_HOOK,
 114         CONDITION_HOOK,
 115         PRELOOP_HOOK,
 116         SELECT_HOOK,
 117         WHOLE_CONDITION_HOOK,
 118         FUNCTION_CALL_HOOK,
 119         CALL_HOOK_AFTER_INLINE,
 120         FUNCTION_CALL_HOOK_AFTER_DB,
 121         CALL_ASSIGNMENT_HOOK,
 122         MACRO_ASSIGNMENT_HOOK,
 123         BINOP_HOOK,
 124         OP_HOOK,
 125         DEREF_HOOK,
 126         CASE_HOOK,
 127         ASM_HOOK,
 128         CAST_HOOK,
 129         SIZEOF_HOOK,
 130         BASE_HOOK,
 131         FUNC_DEF_HOOK,
 132         AFTER_DEF_HOOK,
 133         END_FUNC_HOOK,
 134         AFTER_FUNC_HOOK,
 135         RETURN_HOOK,
 136         INLINE_FN_START,
 137         INLINE_FN_END,
 138         END_FILE_HOOK,
 139         NUM_HOOKS,
 140 };
 141
 142 #define TRUE 1
 143 #define FALSE 0
 144
 145 struct range_list;
 146
 147 void add_hook(void *func, enum hook_type type);
 148 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 149 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 150 void add_merge_hook(int client_id, merge_func_t *func);
 151 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 152 void add_pre_merge_hook(int client_id, void (*hook)(struct sm_state *sm));
 153 typedef void (scope_hook)(void *data);
 154 void add_scope_hook(scope_hook *hook, void *data);
 155 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 156 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 157                                 struct expression *assign_expr, void *data);
 158 typedef void (return_implies_hook)(struct expression *call_expr,
 159                                    int param, char *key, char *value);
 160 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 161 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 162
 163 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 164                               void *info);
 165 void add_implied_return_hook(const char *look_for,
 166                              implied_return_hook *call_back,
 167                              void *info);
 168 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 169                               void *info);
 170 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 171                               void *info);
 172 void return_implies_state(const char *look_for, long long start, long long end,
 173                          implication_hook *call_back, void *info);
 174 void select_return_states_hook(int type, return_implies_hook *callback);
 175 void select_return_states_before(void (*fn)(void));
 176 void select_return_states_after(void (*fn)(void));
 177 int get_implied_return(struct expression *expr, struct range_list **rl);
 178 void allocate_hook_memory(void);
 179
 180 struct modification_data {
 181         struct smatch_state *prev;
 182         struct expression *cur;
 183 };
 184
 185 typedef void (modification_hook)(struct sm_state *sm, struct expression *mod_expr);
 186 void add_modification_hook(int owner, modification_hook *call_back);
 187 void add_modification_hook_late(int owner, modification_hook *call_back);
 188 struct smatch_state *get_modification_state(struct expression *expr);
 189
 190 int outside_of_function(void);
 191 const char *get_filename(void);
 192 const char *get_base_file(void);
 193 char *get_function(void);
 194 int get_lineno(void);
 195 extern int final_pass;
 196 extern struct symbol *cur_func_sym;
 197 extern int option_debug;
 198 extern int local_debug;
 199 extern int option_info;
 200 extern int option_spammy;
 201 extern char *trace_variable;
 202 extern struct stree *global_states;
 203 int is_silenced_function(void);
 204
 205 /* smatch_impossible.c */
 206 int is_impossible_path(void);
 207 void set_path_impossible(void);
 208
 209 extern FILE *sm_outfd;
 210 extern FILE *sql_outfd;
 211 extern FILE *caller_info_fd;
 212 #define sm_printf(msg...) do { if (final_pass || option_debug || local_debug) fprintf(sm_outfd, msg); } while (0)
 213
 214 static inline void sm_prefix(void)
 215 {
 216         sm_printf("%s:%d %s() ", get_filename(), get_lineno(), get_function());
 217 }
 218
 219 static inline void print_implied_debug_msg();
 220
 221 extern bool __silence_warnings_for_stmt;
 222
 223 #define sm_msg(msg...) \
 224 do {                                                           \
 225         print_implied_debug_msg();                             \
 226         if (!final_pass && !option_debug && !local_debug)      \
 227                 break;                                         \
 228         if (__silence_warnings_for_stmt && !option_debug && !local_debug) \
 229                 break;                                         \
 230         if (!option_info && is_silenced_function())            \
 231                 break;                                         \
 232         sm_prefix();                                           \
 233         sm_printf(msg);                                        \
 234         sm_printf("\n");                                       \
 235 } while (0)
 236
 237 #define local_debug(msg...)                                     \
 238 do {                                                            \
 239         if (local_debug)                                        \
 240                 sm_msg(msg);                                    \
 241 } while (0)
 242
 243 extern char *implied_debug_msg;
 244 static inline void print_implied_debug_msg(void)
 245 {
 246         static struct symbol *last_printed = NULL;
 247
 248         if (!implied_debug_msg)
 249                 return;
 250         if (last_printed == cur_func_sym)
 251                 return;
 252         last_printed = cur_func_sym;
 253         sm_msg("%s", implied_debug_msg);
 254 }
 255
 256 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 257
 258 #define sm_info(msg...) do {                                    \
 259         if (option_debug || (option_info && final_pass)) {      \
 260                 sm_prefix();                                    \
 261                 sm_printf("info: ");                            \
 262                 sm_printf(msg);                                 \
 263                 sm_printf("\n");                                \
 264         }                                                       \
 265 } while(0)
 266
 267 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
 268
 269 struct smatch_state *__get_state(int owner, const char *name, struct symbol *sym);
 270 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 271 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 272 struct state_list *get_possible_states(int owner, const char *name,
 273                                        struct symbol *sym);
 274 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 275 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 276                struct smatch_state *state);
 277 struct sm_state *set_state_expr(int owner, struct expression *expr,
 278                 struct smatch_state *state);
 279 void delete_state(int owner, const char *name, struct symbol *sym);
 280 void delete_state_expr(int owner, struct expression *expr);
 281 void __delete_all_states_sym(struct symbol *sym);
 282 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 283                            struct smatch_state *true_state,
 284                            struct smatch_state *false_state);
 285 void set_true_false_states_expr(int owner, struct expression *expr,
 286                            struct smatch_state *true_state,
 287                            struct smatch_state *false_state);
 288
 289 struct stree *get_all_states_from_stree(int owner, struct stree *source);
 290 struct stree *get_all_states_stree(int id);
 291 struct stree *__get_cur_stree(void);
 292 int is_reachable(void);
 293 void add_get_state_hook(void (*fn)(int owner, const char *name, struct symbol *sym));
 294
 295 /* smatch_helper.c */
 296 DECLARE_PTR_LIST(int_stack, int);
 297 char *alloc_string(const char *str);
 298 void free_string(char *str);
 299 void append(char *dest, const char *data, int buff_len);
 300 void remove_parens(char *str);
 301 struct smatch_state *alloc_state_num(int num);
 302 struct smatch_state *alloc_state_str(const char *name);
 303 struct smatch_state *alloc_state_expr(struct expression *expr);
 304 struct expression *get_argument_from_call_expr(struct expression_list *args,
 305                                                int num);
 306
 307 char *expr_to_var(struct expression *expr);
 308 struct symbol *expr_to_sym(struct expression *expr);
 309 char *expr_to_str(struct expression *expr);
 310 char *expr_to_str_sym(struct expression *expr,
 311                                      struct symbol **sym_ptr);
 312 char *expr_to_var_sym(struct expression *expr,
 313                              struct symbol **sym_ptr);
 314 char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
 315 char *expr_to_chunk_sym_vsl(struct expression *expr, struct symbol **sym, struct var_sym_list **vsl);
 316 int get_complication_score(struct expression *expr);
 317
 318 int sym_name_is(const char *name, struct expression *expr);
 319 int get_const_value(struct expression *expr, sval_t *sval);
 320 int get_value(struct expression *expr, sval_t *val);
 321 int get_implied_value(struct expression *expr, sval_t *val);
 322 int get_implied_min(struct expression *expr, sval_t *sval);
 323 int get_implied_max(struct expression *expr, sval_t *val);
 324 int get_hard_max(struct expression *expr, sval_t *sval);
 325 int get_fuzzy_min(struct expression *expr, sval_t *min);
 326 int get_fuzzy_max(struct expression *expr, sval_t *max);
 327 int get_absolute_min(struct expression *expr, sval_t *sval);
 328 int get_absolute_max(struct expression *expr, sval_t *sval);
 329 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 330 int parse_call_math_rl(struct expression *call, char *math, struct range_list **rl);
 331 char *get_value_in_terms_of_parameter_math(struct expression *expr);
 332 char *get_value_in_terms_of_parameter_math_var_sym(const char *var, struct symbol *sym);
 333 int is_zero(struct expression *expr);
 334 int known_condition_true(struct expression *expr);
 335 int known_condition_false(struct expression *expr);
 336 int implied_condition_true(struct expression *expr);
 337 int implied_condition_false(struct expression *expr);
 338 int can_integer_overflow(struct symbol *type, struct expression *expr);
 339
 340 int is_array(struct expression *expr);
 341 struct expression *get_array_base(struct expression *expr);
 342 struct expression *get_array_offset(struct expression *expr);
 343 const char *show_state(struct smatch_state *state);
 344 struct statement *get_expression_statement(struct expression *expr);
 345 struct expression *strip_parens(struct expression *expr);
 346 struct expression *strip_expr(struct expression *expr);
 347 void scoped_state(int my_id, const char *name, struct symbol *sym);
 348 int is_error_return(struct expression *expr);
 349 int getting_address(void);
 350 int get_struct_and_member(struct expression *expr, const char **type, const char **member);
 351 char *get_member_name(struct expression *expr);
 352 char *get_fnptr_name(struct expression *expr);
 353 int cmp_pos(struct position pos1, struct position pos2);
 354 int positions_eq(struct position pos1, struct position pos2);
 355 struct statement *get_current_statement(void);
 356 struct statement *get_prev_statement(void);
 357 int get_param_num_from_sym(struct symbol *sym);
 358 int get_param_num(struct expression *expr);
 359 int ms_since(struct timeval *start);
 360 int parent_is_gone_var_sym(const char *name, struct symbol *sym);
 361 int parent_is_gone(struct expression *expr);
 362 int invert_op(int op);
 363 int expr_equiv(struct expression *one, struct expression *two);
 364 void push_int(struct int_stack **stack, int num);
 365 int pop_int(struct int_stack **stack);
 366
 367 /* smatch_type.c */
 368 struct symbol *get_real_base_type(struct symbol *sym);
 369 int type_bytes(struct symbol *type);
 370 int array_bytes(struct symbol *type);
 371 struct symbol *get_pointer_type(struct expression *expr);
 372 struct symbol *get_type(struct expression *expr);
 373 int type_signed(struct symbol *base_type);
 374 int expr_unsigned(struct expression *expr);
 375 int expr_signed(struct expression *expr);
 376 int returns_unsigned(struct symbol *base_type);
 377 int is_pointer(struct expression *expr);
 378 int returns_pointer(struct symbol *base_type);
 379 sval_t sval_type_max(struct symbol *base_type);
 380 sval_t sval_type_min(struct symbol *base_type);
 381 int nr_bits(struct expression *expr);
 382 int is_void_pointer(struct expression *expr);
 383 int is_char_pointer(struct expression *expr);
 384 int is_string(struct expression *expr);
 385 int is_static(struct expression *expr);
 386 int is_local_variable(struct expression *expr);
 387 int types_equiv(struct symbol *one, struct symbol *two);
 388 int fn_static(void);
 389 const char *global_static();
 390 struct symbol *cur_func_return_type(void);
 391 struct symbol *get_arg_type(struct expression *fn, int arg);
 392 struct symbol *get_member_type_from_key(struct expression *expr, const char *key);
 393 int is_struct(struct expression *expr);
 394 char *type_to_str(struct symbol *type);
 395
 396 /* smatch_ignore.c */
 397 void add_ignore(int owner, const char *name, struct symbol *sym);
 398 int is_ignored(int owner, const char *name, struct symbol *sym);
 399 void add_ignore_expr(int owner, struct expression *expr);
 400 int is_ignored_expr(int owner, struct expression *expr);
 401
 402 /* smatch_var_sym */
 403 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym);
 404 struct var_sym_list *expr_to_vsl(struct expression *expr);
 405 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 406 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr);
 407 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 408 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym);
 409 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl);
 410 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src);
 411 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two);
 412 int var_sym_lists_equiv(struct var_sym_list *one, struct var_sym_list *two);
 413 void free_var_sym_list(struct var_sym_list **list);
 414 void free_var_syms_and_list(struct var_sym_list **list);
 415
 416 /* smatch_tracker */
 417 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 418 void add_tracker(struct tracker_list **list, int owner, const char *name,
 419                 struct symbol *sym);
 420 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 421 void del_tracker(struct tracker_list **list, int owner, const char *name,
 422                 struct symbol *sym);
 423 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 424                 struct symbol *sym);
 425 void free_tracker_list(struct tracker_list **list);
 426 void free_trackers_and_list(struct tracker_list **list);
 427
 428 /* smatch_conditions */
 429 int in_condition(void);
 430
 431 /* smatch_flow.c */
 432
 433 extern int __in_fake_assign;
 434 extern int __in_fake_struct_assign;
 435 void smatch (int argc, char **argv);
 436 int inside_loop(void);
 437 int definitely_inside_loop(void);
 438 struct expression *get_switch_expr(void);
 439 int in_expression_statement(void);
 440 void __process_post_op_stack(void);
 441 void __split_expr(struct expression *expr);
 442 void __split_label_stmt(struct statement *stmt);
 443 void __split_stmt(struct statement *stmt);
 444 extern int __in_function_def;
 445 extern int option_assume_loops;
 446 extern int option_two_passes;
 447 extern int option_no_db;
 448 extern int option_file_output;
 449 extern int option_time;
 450 extern struct expression_list *big_expression_stack;
 451 extern struct expression_list *big_condition_stack;
 452 extern struct statement_list *big_statement_stack;
 453 int is_assigned_call(struct expression *expr);
 454 int inlinable(struct expression *expr);
 455 extern int __inline_call;
 456 extern struct expression *__inline_fn;
 457 extern int __in_pre_condition;
 458 extern int __bail_on_rest_of_function;
 459 extern struct statement *__prev_stmt;
 460 extern struct statement *__cur_stmt;
 461 extern struct statement *__next_stmt;
 462 void init_fake_env(void);
 463 void end_fake_env(void);
 464 int time_parsing_function(void);
 465
 466 /* smatch_struct_assignment.c */
 467 struct expression *get_faked_expression(void);
 468 void __fake_struct_member_assignments(struct expression *expr);
 469
 470 /* smatch_project.c */
 471 int is_no_inline_function(const char *function);
 472
 473 /* smatch_conditions */
 474 void __split_whole_condition(struct expression *expr);
 475 void __handle_logic(struct expression *expr);
 476 int is_condition(struct expression *expr);
 477 int __handle_condition_assigns(struct expression *expr);
 478 int __handle_select_assigns(struct expression *expr);
 479 int __handle_expr_statement_assigns(struct expression *expr);
 480
 481 /* smatch_implied.c */
 482 extern int option_debug_implied;
 483 extern int option_debug_related;
 484 struct range_list_stack;
 485 void param_limit_implications(struct expression *expr, int param, char *key, char *value);
 486 struct stree *__implied_case_stree(struct expression *switch_expr,
 487                                    struct range_list *case_rl,
 488                                    struct range_list_stack **remaining_cases,
 489                                    struct stree **raw_stree);
 490 void overwrite_states_using_pool(struct sm_state *gate_sm, struct sm_state *pool_sm);
 491 int assume(struct expression *expr);
 492 void end_assume(void);
 493 int impossible_assumption(struct expression *left, int op, sval_t sval);
 494
 495 /* smatch_extras.c */
 496 #define SMATCH_EXTRA 5 /* this is my_id from smatch extra set in smatch.c */
 497 extern int RETURN_ID;
 498
 499 struct data_range {
 500         sval_t min;
 501         sval_t max;
 502 };
 503
 504 extern long long valid_ptr_min, valid_ptr_max;
 505 extern sval_t valid_ptr_min_sval, valid_ptr_max_sval;
 506 static const sval_t array_min_sval = {
 507         .type = &ptr_ctype,
 508         {.value = 100000},
 509 };
 510 static const sval_t array_max_sval = {
 511         .type = &ptr_ctype,
 512         {.value = 199999},
 513 };
 514 static const sval_t text_seg_min = {
 515         .type = &ptr_ctype,
 516         {.value = 100000000},
 517 };
 518 static const sval_t text_seg_max = {
 519         .type = &ptr_ctype,
 520         {.value = 177777777},
 521 };
 522 static const sval_t data_seg_min = {
 523         .type = &ptr_ctype,
 524         {.value = 200000000},
 525 };
 526 static const sval_t data_seg_max = {
 527         .type = &ptr_ctype,
 528         {.value = 277777777},
 529 };
 530 static const sval_t bss_seg_min = {
 531         .type = &ptr_ctype,
 532         {.value = 300000000},
 533 };
 534 static const sval_t bss_seg_max = {
 535         .type = &ptr_ctype,
 536         {.value = 377777777},
 537 };
 538 static const sval_t stack_seg_min = {
 539         .type = &ptr_ctype,
 540         {.value = 400000000},
 541 };
 542 static const sval_t stack_seg_max = {
 543         .type = &ptr_ctype,
 544         {.value = 477777777},
 545 };
 546 static const sval_t kmalloc_seg_min = {
 547         .type = &ptr_ctype,
 548         {.value = 500000000},
 549 };
 550 static const sval_t kmalloc_seg_max = {
 551         .type = &ptr_ctype,
 552         {.value = 577777777},
 553 };
 554 static const sval_t vmalloc_seg_min = {
 555         .type = &ptr_ctype,
 556         {.value = 600000000},
 557 };
 558 static const sval_t vmalloc_seg_max = {
 559         .type = &ptr_ctype,
 560         {.value = 677777777},
 561 };
 562 static const sval_t fn_ptr_min = {
 563         .type = &ptr_ctype,
 564         {.value = 700000000},
 565 };
 566 static const sval_t fn_ptr_max = {
 567         .type = &ptr_ctype,
 568         {.value = 777777777},
 569 };
 570
 571 char *get_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 572 char *map_call_to_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 573 char *map_long_to_short_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 574 char *map_long_to_short_name_sym_nostack(const char *name, struct symbol *sym, struct symbol **new_sym);
 575
 576 #define STRLEN_MAX_RET 1010101
 577
 578 /* smatch_absolute.c */
 579 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 580 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 581
 582 /* smatch_local_values.c */
 583 int get_local_rl(struct expression *expr, struct range_list **rl);
 584 int get_local_max_helper(struct expression *expr, sval_t *sval);
 585 int get_local_min_helper(struct expression *expr, sval_t *sval);
 586
 587 /* smatch_type_value.c */
 588 int get_db_type_rl(struct expression *expr, struct range_list **rl);
 589 /* smatch_data_val.c */
 590 int get_db_data_rl(struct expression *expr, struct range_list **rl);
 591
 592 /* smatch_states.c */
 593 void __swap_cur_stree(struct stree *stree);
 594 void __push_fake_cur_stree();
 595 struct stree *__pop_fake_cur_stree();
 596 void __free_fake_cur_stree();
 597 void __set_fake_cur_stree_fast(struct stree *stree);
 598 void __pop_fake_cur_stree_fast(void);
 599 void __merge_stree_into_cur(struct stree *stree);
 600
 601 int unreachable(void);
 602 void __set_sm(struct sm_state *sm);
 603 void __set_sm_cur_stree(struct sm_state *sm);
 604 void __set_sm_fake_stree(struct sm_state *sm);
 605 void __set_true_false_sm(struct sm_state *true_state,
 606                         struct sm_state *false_state);
 607 void nullify_path(void);
 608 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 609                                void *unused);
 610 void __unnullify_path(void);
 611 int __path_is_null(void);
 612 void save_all_states(void);
 613 void restore_all_states(void);
 614 void free_goto_stack(void);
 615 void clear_all_states(void);
 616
 617 struct sm_state *get_sm_state(int owner, const char *name,
 618                                 struct symbol *sym);
 619 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 620 void __push_true_states(void);
 621 void __use_false_states(void);
 622 void __discard_false_states(void);
 623 void __merge_false_states(void);
 624 void __merge_true_states(void);
 625
 626 void __negate_cond_stacks(void);
 627 void __use_pre_cond_states(void);
 628 void __use_cond_true_states(void);
 629 void __use_cond_false_states(void);
 630 void __push_cond_stacks(void);
 631 void __fold_in_set_states(void);
 632 void __free_set_states(void);
 633 struct stree *__copy_cond_true_states(void);
 634 struct stree *__copy_cond_false_states(void);
 635 struct stree *__pop_cond_true_stack(void);
 636 struct stree *__pop_cond_false_stack(void);
 637 void __and_cond_states(void);
 638 void __or_cond_states(void);
 639 void __save_pre_cond_states(void);
 640 void __discard_pre_cond_states(void);
 641 struct stree *__get_true_states(void);
 642 struct stree *__get_false_states(void);
 643 void __use_cond_states(void);
 644 extern struct state_list *__last_base_slist;
 645
 646 void __push_continues(void);
 647 void __discard_continues(void);
 648 void __process_continues(void);
 649 void __merge_continues(void);
 650
 651 void __push_breaks(void);
 652 void __process_breaks(void);
 653 int __has_breaks(void);
 654 void __merge_breaks(void);
 655 void __use_breaks(void);
 656
 657 void __save_switch_states(struct expression *switch_expr);
 658 void __discard_switches(void);
 659 int have_remaining_cases(void);
 660 void __merge_switches(struct expression *switch_expr, struct range_list *case_rl);
 661 void __push_default(void);
 662 void __set_default(void);
 663 int __pop_default(void);
 664
 665 void __push_conditions(void);
 666 void __discard_conditions(void);
 667
 668 void __save_gotos(const char *name, struct symbol *sym);
 669 void __merge_gotos(const char *name, struct symbol *sym);
 670
 671 void __print_cur_stree(void);
 672
 673 /* smatch_hooks.c */
 674 void __pass_to_client(void *data, enum hook_type type);
 675 void __pass_to_client_no_data(enum hook_type type);
 676 void __pass_case_to_client(struct expression *switch_expr,
 677                            struct range_list *rl);
 678 int __has_merge_function(int client_id);
 679 struct smatch_state *__client_merge_function(int owner,
 680                                              struct smatch_state *s1,
 681                                              struct smatch_state *s2);
 682 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 683 void call_pre_merge_hook(struct sm_state *sm);
 684 void __push_scope_hooks(void);
 685 void __call_scope_hooks(void);
 686
 687 /* smatch_function_hooks.c */
 688 void create_function_hook_hash(void);
 689 void __match_initializer_call(struct symbol *sym);
 690
 691 /* smatch_db.c */
 692 enum info_type {
 693         INTERNAL        = 0,
 694         /*
 695          * Changing these numbers is a pain.  Don't do it.  If you ever use a
 696          * number it can't be re-used right away so there may be gaps.
 697          * We select these in order by type so if the order matters, then give
 698          * it a number below 100-999,9000-9999 ranges. */
 699
 700         PARAM_CLEARED   = 101,
 701         PARAM_LIMIT     = 103,
 702         PARAM_FILTER    = 104,
 703
 704         PARAM_VALUE     = 1001,
 705         BUF_SIZE        = 1002,
 706         USER_DATA       = 1003,
 707         CAPPED_DATA     = 1004,
 708         RETURN_VALUE    = 1005,
 709         DEREFERENCE     = 1006,
 710         RANGE_CAP       = 1007,
 711         LOCK_HELD       = 1008,
 712         LOCK_RELEASED   = 1009,
 713         ABSOLUTE_LIMITS = 1010,
 714         PARAM_ADD       = 1012,
 715         PARAM_FREED     = 1013,
 716         DATA_SOURCE     = 1014,
 717         FUZZY_MAX       = 1015,
 718         STR_LEN         = 1016,
 719         ARRAY_LEN       = 1017,
 720         CAPABLE         = 1018,
 721         NS_CAPABLE      = 1019,
 722         CONTAINER       = 1020,
 723         CASTED_CALL     = 1021,
 724         TYPE_LINK       = 1022,
 725         UNTRACKED_PARAM = 1023,
 726         CULL_PATH       = 1024,
 727         PARAM_SET       = 1025,
 728         PARAM_USED      = 1026,
 729         BYTE_UNITS      = 1027,
 730         COMPARE_LIMIT   = 1028,
 731         PARAM_COMPARE   = 1029,
 732         CONSTRAINT      = 1031,
 733         PASSES_TYPE     = 1032,
 734         CONSTRAINT_REQUIRED = 1033,
 735
 736         /* put random temporary stuff in the 7000-7999 range for testing */
 737         USER_DATA3      = 8017,
 738         USER_DATA3_SET  = 9017,
 739         NO_OVERFLOW     = 8018,
 740         NO_OVERFLOW_SIMPLE = 8019,
 741         LOCKED          = 8020,
 742         UNLOCKED        = 8021,
 743         SET_FS          = 8022,
 744         ATOMIC_INC      = 8023,
 745         ATOMIC_DEC      = 8024,
 746         NO_SIDE_EFFECT  = 8025,
 747         FN_ARG_LINK     = 8028,
 748         DATA_VALUE      = 8029,
 749         ARRAYSIZE_ARG   = 8033,
 750         SIZEOF_ARG      = 8034,
 751         MEMORY_TAG      = 8036,
 752         MTAG_ASSIGN     = 8035,
 753 };
 754
 755 void debug_sql(const char *sql);
 756 void debug_mem_sql(const char *sql);
 757 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 758 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm));
 759 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr));
 760 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state));
 761 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value));
 762 struct range_list *db_return_vals(struct expression *expr);
 763 struct range_list *db_return_vals_from_str(const char *fn_name);
 764 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym);
 765 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl);
 766 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym);
 767 const char *state_name_to_param_name(const char *state_name, const char *param_name);
 768 const char *get_param_name_var_sym(const char *name, struct symbol *sym);
 769 const char *get_param_name(struct sm_state *sm);
 770 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym);
 771 const char *get_mtag_name_expr(struct expression *expr);
 772 char *get_data_info_name(struct expression *expr);
 773
 774 #define run_sql(call_back, data, sql...)    \
 775 do {                                  \
 776         char sql_txt[1024];           \
 777         if (option_no_db)             \
 778                 break;                \
 779         snprintf(sql_txt, 1024, sql); \
 780         debug_sql(sql_txt);           \
 781         sql_exec(call_back, data, sql_txt); \
 782 } while (0)
 783
 784 /* like run_sql() but for the in-memory database */
 785 #define mem_sql(call_back, data, sql...)                                                \
 786 do {                                                                            \
 787         char sql_txt[1024];                                                     \
 788                                                                                 \
 789         snprintf(sql_txt, sizeof(sql_txt), sql);                                \
 790         sm_debug("in-mem: %s\n", sql_txt);                                      \
 791         debug_mem_sql(sql_txt);                                                 \
 792         sql_mem_exec(call_back, data, sql_txt);                                 \
 793 } while (0)
 794
 795 char *get_static_filter(struct symbol *sym);
 796
 797 void sql_insert_return_states(int return_id, const char *return_ranges,
 798                 int type, int param, const char *key, const char *value);
 799 void sql_insert_caller_info(struct expression *call, int type, int param,
 800                 const char *key, const char *value);
 801 void sql_insert_function_ptr(const char *fn, const char *struct_name);
 802 void sql_insert_return_values(const char *return_values);
 803 void sql_insert_call_implies(int type, int param, const char *key, const char *value);
 804 void sql_insert_function_type_size(const char *member, const char *ranges);
 805 void sql_insert_local_values(const char *name, const char *value);
 806 void sql_insert_function_type_value(const char *type, const char *value);
 807 void sql_insert_function_type(int param, const char *value);
 808 void sql_insert_parameter_name(int param, const char *value);
 809 void sql_insert_data_info(struct expression *data, int type, const char *value);
 810 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value);
 811 void sql_save_constraint(const char *con);
 812 void sql_save_constraint_required(const char *data, int op, const char *limit);
 813 void sql_copy_constraint_required(const char *new_limit, const char *old_limit);
 814 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data);
 815 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value);
 816 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name);
 817 void insert_mtag_data(mtag_t tag, int offset, struct range_list *rl);
 818 void sql_insert_mtag_map(mtag_t tag, int offset, mtag_t container);
 819 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias);
 820 int mtag_map_select_container(mtag_t tag, int offset, mtag_t *container);
 821 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag);
 822
 823 void sql_select_return_states(const char *cols, struct expression *call,
 824         int (*callback)(void*, int, char**, char**), void *info);
 825 void sql_select_call_implies(const char *cols, struct expression *call,
 826         int (*callback)(void*, int, char**, char**));
 827
 828 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 829 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 830
 831 void open_smatch_db(void);
 832
 833 /* smatch_files.c */
 834 int open_data_file(const char *filename);
 835 struct token *get_tokens_file(const char *filename);
 836
 837 /* smatch.c */
 838 extern char *option_debug_check;
 839 extern char *option_project_str;
 840 extern char *data_dir;
 841 extern int option_no_data;
 842 extern int option_full_path;
 843 extern int option_param_mapper;
 844 extern int option_call_tree;
 845 extern int num_checks;
 846
 847 enum project_type {
 848         PROJ_NONE,
 849         PROJ_KERNEL,
 850         PROJ_WINE,
 851         PROJ_UNKNOWN,
 852 };
 853 extern enum project_type option_project;
 854 const char *check_name(unsigned short id);
 855 int id_from_name(const char *name);
 856
 857
 858 /* smatch_buf_size.c */
 859 int get_array_size(struct expression *expr);
 860 int get_array_size_bytes(struct expression *expr);
 861 int get_array_size_bytes_min(struct expression *expr);
 862 int get_array_size_bytes_max(struct expression *expr);
 863 struct range_list *get_array_size_bytes_rl(struct expression *expr);
 864 int get_real_array_size(struct expression *expr);
 865 int last_member_is_resizable(struct symbol *type);
 866 /* smatch_strlen.c */
 867 int get_implied_strlen(struct expression *expr, struct range_list **rl);
 868 int get_size_from_strlen(struct expression *expr);
 869
 870 /* smatch_capped.c */
 871 int is_capped(struct expression *expr);
 872 int is_capped_var_sym(const char *name, struct symbol *sym);
 873
 874 /* check_user_data.c */
 875 int is_user_macro(struct expression *expr);
 876 int is_user_data(struct expression *expr);
 877 int is_capped_user_data(struct expression *expr);
 878 int implied_user_data(struct expression *expr, struct range_list **rl);
 879 int get_user_rl(struct expression *expr, struct range_list **rl);
 880 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl);
 881
 882 /* check_locking.c */
 883 void print_held_locks();
 884
 885 /* check_assigned_expr.c */
 886 struct expression *get_assigned_expr(struct expression *expr);
 887 struct expression *get_assigned_expr_name_sym(const char *name, struct symbol *sym);
 888 /* smatch_return_to_param.c */
 889 void __add_return_to_param_mapping(struct expression *assign, const char *return_string);
 890 char *map_call_to_param_name_sym(struct expression *expr, struct symbol **sym);
 891
 892 /* smatch_comparison.c */
 893 struct compare_data {
 894         /* The ->left and ->right expression pointers might be NULL (I'm lazy) */
 895         struct expression *left;
 896         const char *left_var;
 897         struct var_sym_list *left_vsl;
 898         int comparison;
 899         struct expression *right;
 900         const char *right_var;
 901         struct var_sym_list *right_vsl;
 902 };
 903 DECLARE_ALLOCATOR(compare_data);
 904 struct smatch_state *alloc_compare_state(
 905                 struct expression *left,
 906                 const char *left_var, struct var_sym_list *left_vsl,
 907                 int comparison,
 908                 struct expression *right,
 909                 const char *right_var, struct var_sym_list *right_vsl);
 910 int merge_comparisons(int one, int two);
 911 int combine_comparisons(int left_compare, int right_compare);
 912 int state_to_comparison(struct smatch_state *state);
 913 struct smatch_state *merge_compare_states(struct smatch_state *s1, struct smatch_state *s2);
 914 int get_comparison(struct expression *left, struct expression *right);
 915 int get_comparison_strings(const char *one, const char *two);
 916 int possible_comparison(struct expression *a, int comparison, struct expression *b);
 917 struct state_list *get_all_comparisons(struct expression *expr);
 918 struct state_list *get_all_possible_equal_comparisons(struct expression *expr);
 919 void __add_return_comparison(struct expression *call, const char *range);
 920 void __add_comparison_info(struct expression *expr, struct expression *call, const char *range);
 921 char *get_printed_param_name(struct expression *call, const char *param_name, struct symbol *param_sym);
 922 char *name_sym_to_param_comparison(const char *name, struct symbol *sym);
 923 char *expr_equal_to_param(struct expression *expr, int ignore);
 924 char *expr_lte_to_param(struct expression *expr, int ignore);
 925 char *expr_param_comparison(struct expression *expr, int ignore);
 926 int flip_comparison(int op);
 927 int negate_comparison(int op);
 928 int remove_unsigned_from_comparison(int op);
 929 int param_compare_limit_is_impossible(struct expression *expr, int left_param, char *left_key, char *value);
 930 void filter_by_comparison(struct range_list **rl, int comparison, struct range_list *right);
 931 struct sm_state *comparison_implication_hook(struct expression *expr,
 932                         struct state_list **true_stack,
 933                         struct state_list **false_stack);
 934 void __compare_param_limit_hook(struct expression *left_expr, struct expression *right_expr,
 935                                 const char *state_name,
 936                                 struct smatch_state *true_state, struct smatch_state *false_state);
 937
 938
 939 /* smatch_sval.c */
 940 sval_t *sval_alloc(sval_t sval);
 941 sval_t *sval_alloc_permanent(sval_t sval);
 942 sval_t sval_blank(struct expression *expr);
 943 sval_t sval_type_val(struct symbol *type, long long val);
 944 sval_t sval_from_val(struct expression *expr, long long val);
 945 int sval_unsigned(sval_t sval);
 946 int sval_signed(sval_t sval);
 947 int sval_bits(sval_t sval);
 948 int sval_bits_used(sval_t sval);
 949 int sval_is_negative(sval_t sval);
 950 int sval_is_positive(sval_t sval);
 951 int sval_is_min(sval_t sval);
 952 int sval_is_max(sval_t sval);
 953 int sval_is_a_min(sval_t sval);
 954 int sval_is_a_max(sval_t sval);
 955 int sval_is_negative_min(sval_t sval);
 956 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
 957 int sval_cmp_val(sval_t one, long long val);
 958 sval_t sval_min(sval_t one, sval_t two);
 959 sval_t sval_max(sval_t one, sval_t two);
 960 int sval_too_low(struct symbol *type, sval_t sval);
 961 int sval_too_high(struct symbol *type, sval_t sval);
 962 int sval_fits(struct symbol *type, sval_t sval);
 963 sval_t sval_cast(struct symbol *type, sval_t sval);
 964 sval_t sval_preop(sval_t sval, int op);
 965 sval_t sval_binop(sval_t left, int op, sval_t right);
 966 int sval_binop_overflows(sval_t left, int op, sval_t right);
 967 unsigned long long fls_mask(unsigned long long uvalue);
 968 unsigned long long sval_fls_mask(sval_t sval);
 969 const char *sval_to_str(sval_t sval);
 970 const char *sval_to_numstr(sval_t sval);
 971 sval_t ll_to_sval(long long val);
 972
 973 /* smatch_string_list.c */
 974 int list_has_string(struct string_list *str_list, const char *str);
 975 void insert_string(struct string_list **str_list, const char *str);
 976 struct string_list *clone_str_list(struct string_list *orig);
 977 struct string_list *combine_string_lists(struct string_list *one, struct string_list *two);
 978
 979 /* smatch_start_states.c */
 980 struct stree *get_start_states(void);
 981
 982 /* smatch_recurse.c */
 983 int has_symbol(struct expression *expr, struct symbol *sym);
 984 int has_variable(struct expression *expr, struct expression *var);
 985 int has_inc_dec(struct expression *expr);
 986
 987 /* smatch_stored_conditions.c */
 988 struct smatch_state *get_stored_condition(struct expression *expr);
 989 struct expression_list *get_conditions(struct expression *expr);
 990 struct sm_state *stored_condition_implication_hook(struct expression *expr,
 991                         struct state_list **true_stack,
 992                         struct state_list **false_stack);
 993
 994 /* check_string_len.c */
 995 int get_formatted_string_size(struct expression *call, int arg);
 996
 997 /* smatch_param_set.c */
 998 int param_was_set(struct expression *expr);
 999 int param_was_set_var_sym(const char *name, struct symbol *sym);
1000 /* smatch_param_filter.c */
1001 int param_has_filter_data(struct sm_state *sm);
1002
1003 /* smatch_links.c */
1004 void set_up_link_functions(int id, int linkid);
1005 struct smatch_state *merge_link_states(struct smatch_state *s1, struct smatch_state *s2);
1006 void store_link(int link_id, const char *name, struct symbol *sym, const char *link_name, struct symbol *link_sym);
1007
1008 /* smatch_auto_copy.c */
1009 void set_auto_copy(int owner);
1010
1011 /* check_buf_comparison */
1012 struct expression *get_size_variable(struct expression *buf);
1013 struct expression *get_array_variable(struct expression *size);
1014
1015 /* smatch_untracked_param.c */
1016 void mark_untracked(struct expression *expr, int param, const char *key, const char *value);
1017 void add_untracked_param_hook(void (func)(struct expression *call, int param));
1018
1019 /* smatch_strings.c */
1020 struct state_list *get_strings(struct expression *expr);
1021
1022 /* smatch_estate.c */
1023 int estate_get_single_value(struct smatch_state *state, sval_t *sval);
1024
1025 /* smatch_address.c */
1026 int get_address_rl(struct expression *expr, struct range_list **rl);
1027 int get_member_offset(struct symbol *type, const char *member_name);
1028 int get_member_offset_from_deref(struct expression *expr);
1029
1030 /* for now this is in smatch_used_parameter.c */
1031 void __get_state_hook(int owner, const char *name, struct symbol *sym);
1032
1033 /* smatch_buf_comparison.c */
1034 int db_var_is_array_limit(struct expression *array, const char *name, struct var_sym_list *vsl);
1035
1036 struct stree *get_all_return_states(void);
1037 struct stree_stack *get_all_return_strees(void);
1038 int on_atomic_dec_path(void);
1039 int was_inced(const char *name, struct symbol *sym);
1040
1041 /* smatch_constraints.c */
1042 char *get_constraint_str(struct expression *expr);
1043 struct constraint_list *get_constraints(struct expression *expr);
1044 char *unmet_constraint(struct expression *data, struct expression *offset);
1045 char *get_required_constraint(const char *data_str);
1046
1047 /* smatch_container_of.c */
1048 int get_param_from_container_of(struct expression *expr);
1049 int get_offset_from_container_of(struct expression *expr);
1050
1051 /* smatch_mtag.c */
1052 int get_toplevel_mtag(struct symbol *sym, mtag_t *tag);
1053 int get_mtag(struct expression *expr, mtag_t *tag);
1054 int get_mtag_offset(struct expression *expr);
1055 int create_mtag_alias(mtag_t tag, struct expression *expr, mtag_t *new);
1056 int expr_to_mtag_name_offset(struct expression *expr, mtag_t *tag, char **name, int *offset);
1057 void update_mtag_data(struct expression *expr);
1058
1059 static inline int type_bits(struct symbol *type)
1060 {
1061         if (!type)
1062                 return 0;
1063         if (type->type == SYM_PTR)  /* Sparse doesn't set this for &pointers */
1064                 return bits_in_pointer;
1065         if (type->type == SYM_ARRAY)
1066                 return bits_in_pointer;
1067         if (!type->examined)
1068                 examine_symbol_type(type);
1069         return type->bit_size;
1070 }
1071
1072 static inline int type_unsigned(struct symbol *base_type)
1073 {
1074         if (!base_type)
1075                 return 0;
1076         if (base_type->ctype.modifiers & MOD_UNSIGNED)
1077                 return 1;
1078         return 0;
1079 }
1080
1081 static inline int type_positive_bits(struct symbol *type)
1082 {
1083         if (!type)
1084                 return 0;
1085         if (type->type == SYM_ARRAY)
1086                 return bits_in_pointer - 1;
1087         if (type_unsigned(type))
1088                 return type_bits(type);
1089         return type_bits(type) - 1;
1090 }
1091
1092 static inline int sval_positive_bits(sval_t sval)
1093 {
1094         return type_positive_bits(sval.type);
1095 }
1096
1097 /*
1098  * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
1099  */
1100 static inline int sval_cmp(sval_t one, sval_t two)
1101 {
1102         struct symbol *type;
1103
1104         type = one.type;
1105         if (sval_positive_bits(two) > sval_positive_bits(one))
1106                 type = two.type;
1107         if (type_bits(type) < 31)
1108                 type = &int_ctype;
1109
1110         one = sval_cast(type, one);
1111         two = sval_cast(type, two);
1112
1113         if (type_unsigned(type)) {
1114                 if (one.uvalue < two.uvalue)
1115                         return -1;
1116                 if (one.uvalue == two.uvalue)
1117                         return 0;
1118                 return 1;
1119         }
1120         /* fix me handle type promotion and unsigned values */
1121         if (one.value < two.value)
1122                 return -1;
1123         if (one.value == two.value)
1124                 return 0;
1125         return 1;
1126 }
1127
1128 #endif      /* !SMATCH_H_ */