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_BEFORE,
 119         FUNCTION_CALL_HOOK,
 120         CALL_HOOK_AFTER_INLINE,
 121         FUNCTION_CALL_HOOK_AFTER_DB,
 122         CALL_ASSIGNMENT_HOOK,
 123         MACRO_ASSIGNMENT_HOOK,
 124         BINOP_HOOK,
 125         OP_HOOK,
 126         DEREF_HOOK,
 127         CASE_HOOK,
 128         ASM_HOOK,
 129         CAST_HOOK,
 130         SIZEOF_HOOK,
 131         BASE_HOOK,
 132         FUNC_DEF_HOOK,
 133         AFTER_DEF_HOOK,
 134         END_FUNC_HOOK,
 135         AFTER_FUNC_HOOK,
 136         RETURN_HOOK,
 137         INLINE_FN_START,
 138         INLINE_FN_END,
 139         END_FILE_HOOK,
 140         NUM_HOOKS,
 141 };
 142
 143 #define TRUE 1
 144 #define FALSE 0
 145
 146 struct range_list;
 147
 148 void add_hook(void *func, enum hook_type type);
 149 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 150 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 151 void add_merge_hook(int client_id, merge_func_t *func);
 152 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 153 void add_pre_merge_hook(int client_id, void (*hook)(struct sm_state *sm));
 154 typedef void (scope_hook)(void *data);
 155 void add_scope_hook(scope_hook *hook, void *data);
 156 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 157 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 158                                 struct expression *assign_expr, void *data);
 159 typedef void (return_implies_hook)(struct expression *call_expr,
 160                                    int param, char *key, char *value);
 161 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 162 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 163
 164 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 165                               void *info);
 166 void add_implied_return_hook(const char *look_for,
 167                              implied_return_hook *call_back,
 168                              void *info);
 169 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 170                               void *info);
 171 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 172                               void *info);
 173 void return_implies_state(const char *look_for, long long start, long long end,
 174                          implication_hook *call_back, void *info);
 175 void select_return_states_hook(int type, return_implies_hook *callback);
 176 void select_return_states_before(void (*fn)(void));
 177 void select_return_states_after(void (*fn)(void));
 178 int get_implied_return(struct expression *expr, struct range_list **rl);
 179 void allocate_hook_memory(void);
 180
 181 struct modification_data {
 182         struct smatch_state *prev;
 183         struct expression *cur;
 184 };
 185
 186 typedef void (modification_hook)(struct sm_state *sm, struct expression *mod_expr);
 187 void add_modification_hook(int owner, modification_hook *call_back);
 188 void add_modification_hook_late(int owner, modification_hook *call_back);
 189 struct smatch_state *get_modification_state(struct expression *expr);
 190
 191 int outside_of_function(void);
 192 const char *get_filename(void);
 193 const char *get_base_file(void);
 194 char *get_function(void);
 195 int get_lineno(void);
 196 extern int final_pass;
 197 extern struct symbol *cur_func_sym;
 198 extern int option_debug;
 199 extern int local_debug;
 200 extern int option_info;
 201 extern int option_spammy;
 202 extern char *trace_variable;
 203 extern struct stree *global_states;
 204 int is_silenced_function(void);
 205
 206 /* smatch_impossible.c */
 207 int is_impossible_path(void);
 208 void set_path_impossible(void);
 209
 210 extern FILE *sm_outfd;
 211 extern FILE *sql_outfd;
 212 extern FILE *caller_info_fd;
 213 #define sm_printf(msg...) do { if (final_pass || option_debug || local_debug) fprintf(sm_outfd, msg); } while (0)
 214
 215 static inline void sm_prefix(void)
 216 {
 217         sm_printf("%s:%d %s() ", get_filename(), get_lineno(), get_function());
 218 }
 219
 220 static inline void print_implied_debug_msg();
 221
 222 extern bool __silence_warnings_for_stmt;
 223
 224 #define sm_msg(msg...) \
 225 do {                                                           \
 226         print_implied_debug_msg();                             \
 227         if (!final_pass && !option_debug && !local_debug)      \
 228                 break;                                         \
 229         if (__silence_warnings_for_stmt && !option_debug && !local_debug) \
 230                 break;                                         \
 231         if (!option_info && is_silenced_function())            \
 232                 break;                                         \
 233         sm_prefix();                                           \
 234         sm_printf(msg);                                        \
 235         sm_printf("\n");                                       \
 236 } while (0)
 237
 238 #define local_debug(msg...)                                     \
 239 do {                                                            \
 240         if (local_debug)                                        \
 241                 sm_msg(msg);                                    \
 242 } while (0)
 243
 244 extern char *implied_debug_msg;
 245 static inline void print_implied_debug_msg(void)
 246 {
 247         static struct symbol *last_printed = NULL;
 248
 249         if (!implied_debug_msg)
 250                 return;
 251         if (last_printed == cur_func_sym)
 252                 return;
 253         last_printed = cur_func_sym;
 254         sm_msg("%s", implied_debug_msg);
 255 }
 256
 257 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 258
 259 #define sm_info(msg...) do {                                    \
 260         if (option_debug || (option_info && final_pass)) {      \
 261                 sm_prefix();                                    \
 262                 sm_printf("info: ");                            \
 263                 sm_printf(msg);                                 \
 264                 sm_printf("\n");                                \
 265         }                                                       \
 266 } while(0)
 267
 268 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
 269
 270 struct smatch_state *__get_state(int owner, const char *name, struct symbol *sym);
 271 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 272 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 273 struct state_list *get_possible_states(int owner, const char *name,
 274                                        struct symbol *sym);
 275 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 276 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 277                struct smatch_state *state);
 278 struct sm_state *set_state_expr(int owner, struct expression *expr,
 279                 struct smatch_state *state);
 280 void delete_state(int owner, const char *name, struct symbol *sym);
 281 void delete_state_expr(int owner, struct expression *expr);
 282 void __delete_all_states_sym(struct symbol *sym);
 283 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 284                            struct smatch_state *true_state,
 285                            struct smatch_state *false_state);
 286 void set_true_false_states_expr(int owner, struct expression *expr,
 287                            struct smatch_state *true_state,
 288                            struct smatch_state *false_state);
 289
 290 struct stree *get_all_states_from_stree(int owner, struct stree *source);
 291 struct stree *get_all_states_stree(int id);
 292 struct stree *__get_cur_stree(void);
 293 int is_reachable(void);
 294 void add_get_state_hook(void (*fn)(int owner, const char *name, struct symbol *sym));
 295
 296 /* smatch_helper.c */
 297 DECLARE_PTR_LIST(int_stack, int);
 298 char *alloc_string(const char *str);
 299 void free_string(char *str);
 300 void append(char *dest, const char *data, int buff_len);
 301 void remove_parens(char *str);
 302 struct smatch_state *alloc_state_num(int num);
 303 struct smatch_state *alloc_state_str(const char *name);
 304 struct smatch_state *alloc_state_expr(struct expression *expr);
 305 struct expression *get_argument_from_call_expr(struct expression_list *args,
 306                                                int num);
 307
 308 char *expr_to_var(struct expression *expr);
 309 struct symbol *expr_to_sym(struct expression *expr);
 310 char *expr_to_str(struct expression *expr);
 311 char *expr_to_str_sym(struct expression *expr,
 312                                      struct symbol **sym_ptr);
 313 char *expr_to_var_sym(struct expression *expr,
 314                              struct symbol **sym_ptr);
 315 char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
 316 char *expr_to_chunk_sym_vsl(struct expression *expr, struct symbol **sym, struct var_sym_list **vsl);
 317 int get_complication_score(struct expression *expr);
 318
 319 int sym_name_is(const char *name, struct expression *expr);
 320 int get_const_value(struct expression *expr, sval_t *sval);
 321 int get_value(struct expression *expr, sval_t *val);
 322 int get_implied_value(struct expression *expr, sval_t *val);
 323 int get_implied_min(struct expression *expr, sval_t *sval);
 324 int get_implied_max(struct expression *expr, sval_t *val);
 325 int get_hard_max(struct expression *expr, sval_t *sval);
 326 int get_fuzzy_min(struct expression *expr, sval_t *min);
 327 int get_fuzzy_max(struct expression *expr, sval_t *max);
 328 int get_absolute_min(struct expression *expr, sval_t *sval);
 329 int get_absolute_max(struct expression *expr, sval_t *sval);
 330 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 331 int parse_call_math_rl(struct expression *call, char *math, struct range_list **rl);
 332 char *get_value_in_terms_of_parameter_math(struct expression *expr);
 333 char *get_value_in_terms_of_parameter_math_var_sym(const char *var, struct symbol *sym);
 334 int is_zero(struct expression *expr);
 335 int known_condition_true(struct expression *expr);
 336 int known_condition_false(struct expression *expr);
 337 int implied_condition_true(struct expression *expr);
 338 int implied_condition_false(struct expression *expr);
 339 int can_integer_overflow(struct symbol *type, struct expression *expr);
 340
 341 int is_array(struct expression *expr);
 342 struct expression *get_array_base(struct expression *expr);
 343 struct expression *get_array_offset(struct expression *expr);
 344 const char *show_state(struct smatch_state *state);
 345 struct statement *get_expression_statement(struct expression *expr);
 346 struct expression *strip_parens(struct expression *expr);
 347 struct expression *strip_expr(struct expression *expr);
 348 void scoped_state(int my_id, const char *name, struct symbol *sym);
 349 int is_error_return(struct expression *expr);
 350 int getting_address(void);
 351 int get_struct_and_member(struct expression *expr, const char **type, const char **member);
 352 char *get_member_name(struct expression *expr);
 353 char *get_fnptr_name(struct expression *expr);
 354 int cmp_pos(struct position pos1, struct position pos2);
 355 int positions_eq(struct position pos1, struct position pos2);
 356 struct statement *get_current_statement(void);
 357 struct statement *get_prev_statement(void);
 358 int get_param_num_from_sym(struct symbol *sym);
 359 int get_param_num(struct expression *expr);
 360 int ms_since(struct timeval *start);
 361 int parent_is_gone_var_sym(const char *name, struct symbol *sym);
 362 int parent_is_gone(struct expression *expr);
 363 int invert_op(int op);
 364 int expr_equiv(struct expression *one, struct expression *two);
 365 void push_int(struct int_stack **stack, int num);
 366 int pop_int(struct int_stack **stack);
 367
 368 /* smatch_type.c */
 369 struct symbol *get_real_base_type(struct symbol *sym);
 370 int type_bytes(struct symbol *type);
 371 int array_bytes(struct symbol *type);
 372 struct symbol *get_pointer_type(struct expression *expr);
 373 struct symbol *get_type(struct expression *expr);
 374 int type_signed(struct symbol *base_type);
 375 int expr_unsigned(struct expression *expr);
 376 int expr_signed(struct expression *expr);
 377 int returns_unsigned(struct symbol *base_type);
 378 int is_pointer(struct expression *expr);
 379 int returns_pointer(struct symbol *base_type);
 380 sval_t sval_type_max(struct symbol *base_type);
 381 sval_t sval_type_min(struct symbol *base_type);
 382 int nr_bits(struct expression *expr);
 383 int is_void_pointer(struct expression *expr);
 384 int is_char_pointer(struct expression *expr);
 385 int is_string(struct expression *expr);
 386 int is_static(struct expression *expr);
 387 int is_local_variable(struct expression *expr);
 388 int types_equiv(struct symbol *one, struct symbol *two);
 389 int fn_static(void);
 390 const char *global_static();
 391 struct symbol *cur_func_return_type(void);
 392 struct symbol *get_arg_type(struct expression *fn, int arg);
 393 struct symbol *get_member_type_from_key(struct expression *expr, const char *key);
 394 int is_struct(struct expression *expr);
 395 char *type_to_str(struct symbol *type);
 396
 397 /* smatch_ignore.c */
 398 void add_ignore(int owner, const char *name, struct symbol *sym);
 399 int is_ignored(int owner, const char *name, struct symbol *sym);
 400 void add_ignore_expr(int owner, struct expression *expr);
 401 int is_ignored_expr(int owner, struct expression *expr);
 402
 403 /* smatch_var_sym */
 404 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym);
 405 struct var_sym_list *expr_to_vsl(struct expression *expr);
 406 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 407 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr);
 408 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 409 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym);
 410 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl);
 411 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src);
 412 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two);
 413 int var_sym_lists_equiv(struct var_sym_list *one, struct var_sym_list *two);
 414 void free_var_sym_list(struct var_sym_list **list);
 415 void free_var_syms_and_list(struct var_sym_list **list);
 416
 417 /* smatch_tracker */
 418 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 419 void add_tracker(struct tracker_list **list, int owner, const char *name,
 420                 struct symbol *sym);
 421 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 422 void del_tracker(struct tracker_list **list, int owner, const char *name,
 423                 struct symbol *sym);
 424 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 425                 struct symbol *sym);
 426 void free_tracker_list(struct tracker_list **list);
 427 void free_trackers_and_list(struct tracker_list **list);
 428
 429 /* smatch_conditions */
 430 int in_condition(void);
 431
 432 /* smatch_flow.c */
 433
 434 extern int __in_fake_assign;
 435 extern int __in_fake_struct_assign;
 436 void smatch (int argc, char **argv);
 437 int inside_loop(void);
 438 int definitely_inside_loop(void);
 439 struct expression *get_switch_expr(void);
 440 int in_expression_statement(void);
 441 void __process_post_op_stack(void);
 442 void __split_expr(struct expression *expr);
 443 void __split_label_stmt(struct statement *stmt);
 444 void __split_stmt(struct statement *stmt);
 445 extern int __in_function_def;
 446 extern int option_assume_loops;
 447 extern int option_two_passes;
 448 extern int option_no_db;
 449 extern int option_file_output;
 450 extern int option_time;
 451 extern struct expression_list *big_expression_stack;
 452 extern struct expression_list *big_condition_stack;
 453 extern struct statement_list *big_statement_stack;
 454 int is_assigned_call(struct expression *expr);
 455 int inlinable(struct expression *expr);
 456 extern int __inline_call;
 457 extern struct expression *__inline_fn;
 458 extern int __in_pre_condition;
 459 extern int __bail_on_rest_of_function;
 460 extern struct statement *__prev_stmt;
 461 extern struct statement *__cur_stmt;
 462 extern struct statement *__next_stmt;
 463 void init_fake_env(void);
 464 void end_fake_env(void);
 465 int time_parsing_function(void);
 466
 467 /* smatch_struct_assignment.c */
 468 struct expression *get_faked_expression(void);
 469 void __fake_struct_member_assignments(struct expression *expr);
 470
 471 /* smatch_project.c */
 472 int is_no_inline_function(const char *function);
 473
 474 /* smatch_conditions */
 475 void __split_whole_condition(struct expression *expr);
 476 void __handle_logic(struct expression *expr);
 477 int is_condition(struct expression *expr);
 478 int __handle_condition_assigns(struct expression *expr);
 479 int __handle_select_assigns(struct expression *expr);
 480 int __handle_expr_statement_assigns(struct expression *expr);
 481
 482 /* smatch_implied.c */
 483 extern int option_debug_implied;
 484 extern int option_debug_related;
 485 struct range_list_stack;
 486 void param_limit_implications(struct expression *expr, int param, char *key, char *value);
 487 struct stree *__implied_case_stree(struct expression *switch_expr,
 488                                    struct range_list *case_rl,
 489                                    struct range_list_stack **remaining_cases,
 490                                    struct stree **raw_stree);
 491 void overwrite_states_using_pool(struct sm_state *gate_sm, struct sm_state *pool_sm);
 492 int assume(struct expression *expr);
 493 void end_assume(void);
 494 int impossible_assumption(struct expression *left, int op, sval_t sval);
 495
 496 /* smatch_extras.c */
 497 #define SMATCH_EXTRA 5 /* this is my_id from smatch extra set in smatch.c */
 498 extern int RETURN_ID;
 499
 500 struct data_range {
 501         sval_t min;
 502         sval_t max;
 503 };
 504
 505 extern long long valid_ptr_min, valid_ptr_max;
 506 extern sval_t valid_ptr_min_sval, valid_ptr_max_sval;
 507 static const sval_t array_min_sval = {
 508         .type = &ptr_ctype,
 509         {.value = 100000},
 510 };
 511 static const sval_t array_max_sval = {
 512         .type = &ptr_ctype,
 513         {.value = 199999},
 514 };
 515 static const sval_t text_seg_min = {
 516         .type = &ptr_ctype,
 517         {.value = 100000000},
 518 };
 519 static const sval_t text_seg_max = {
 520         .type = &ptr_ctype,
 521         {.value = 177777777},
 522 };
 523 static const sval_t data_seg_min = {
 524         .type = &ptr_ctype,
 525         {.value = 200000000},
 526 };
 527 static const sval_t data_seg_max = {
 528         .type = &ptr_ctype,
 529         {.value = 277777777},
 530 };
 531 static const sval_t bss_seg_min = {
 532         .type = &ptr_ctype,
 533         {.value = 300000000},
 534 };
 535 static const sval_t bss_seg_max = {
 536         .type = &ptr_ctype,
 537         {.value = 377777777},
 538 };
 539 static const sval_t stack_seg_min = {
 540         .type = &ptr_ctype,
 541         {.value = 400000000},
 542 };
 543 static const sval_t stack_seg_max = {
 544         .type = &ptr_ctype,
 545         {.value = 477777777},
 546 };
 547 static const sval_t kmalloc_seg_min = {
 548         .type = &ptr_ctype,
 549         {.value = 500000000},
 550 };
 551 static const sval_t kmalloc_seg_max = {
 552         .type = &ptr_ctype,
 553         {.value = 577777777},
 554 };
 555 static const sval_t vmalloc_seg_min = {
 556         .type = &ptr_ctype,
 557         {.value = 600000000},
 558 };
 559 static const sval_t vmalloc_seg_max = {
 560         .type = &ptr_ctype,
 561         {.value = 677777777},
 562 };
 563 static const sval_t fn_ptr_min = {
 564         .type = &ptr_ctype,
 565         {.value = 700000000},
 566 };
 567 static const sval_t fn_ptr_max = {
 568         .type = &ptr_ctype,
 569         {.value = 777777777},
 570 };
 571
 572 char *get_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 573 char *map_call_to_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 574 char *map_long_to_short_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 575 char *map_long_to_short_name_sym_nostack(const char *name, struct symbol *sym, struct symbol **new_sym);
 576
 577 #define STRLEN_MAX_RET 1010101
 578
 579 /* smatch_absolute.c */
 580 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 581 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 582
 583 /* smatch_local_values.c */
 584 int get_local_rl(struct expression *expr, struct range_list **rl);
 585 int get_local_max_helper(struct expression *expr, sval_t *sval);
 586 int get_local_min_helper(struct expression *expr, sval_t *sval);
 587
 588 /* smatch_type_value.c */
 589 int get_db_type_rl(struct expression *expr, struct range_list **rl);
 590 /* smatch_data_val.c */
 591 int get_db_data_rl(struct expression *expr, struct range_list **rl);
 592
 593 /* smatch_states.c */
 594 void __swap_cur_stree(struct stree *stree);
 595 void __push_fake_cur_stree();
 596 struct stree *__pop_fake_cur_stree();
 597 void __free_fake_cur_stree();
 598 void __set_fake_cur_stree_fast(struct stree *stree);
 599 void __pop_fake_cur_stree_fast(void);
 600 void __merge_stree_into_cur(struct stree *stree);
 601
 602 int unreachable(void);
 603 void __set_sm(struct sm_state *sm);
 604 void __set_sm_cur_stree(struct sm_state *sm);
 605 void __set_sm_fake_stree(struct sm_state *sm);
 606 void __set_true_false_sm(struct sm_state *true_state,
 607                         struct sm_state *false_state);
 608 void nullify_path(void);
 609 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 610                                void *unused);
 611 void __unnullify_path(void);
 612 int __path_is_null(void);
 613 void save_all_states(void);
 614 void restore_all_states(void);
 615 void free_goto_stack(void);
 616 void clear_all_states(void);
 617
 618 struct sm_state *get_sm_state(int owner, const char *name,
 619                                 struct symbol *sym);
 620 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 621 void __push_true_states(void);
 622 void __use_false_states(void);
 623 void __discard_false_states(void);
 624 void __merge_false_states(void);
 625 void __merge_true_states(void);
 626
 627 void __negate_cond_stacks(void);
 628 void __use_pre_cond_states(void);
 629 void __use_cond_true_states(void);
 630 void __use_cond_false_states(void);
 631 void __push_cond_stacks(void);
 632 void __fold_in_set_states(void);
 633 void __free_set_states(void);
 634 struct stree *__copy_cond_true_states(void);
 635 struct stree *__copy_cond_false_states(void);
 636 struct stree *__pop_cond_true_stack(void);
 637 struct stree *__pop_cond_false_stack(void);
 638 void __and_cond_states(void);
 639 void __or_cond_states(void);
 640 void __save_pre_cond_states(void);
 641 void __discard_pre_cond_states(void);
 642 struct stree *__get_true_states(void);
 643 struct stree *__get_false_states(void);
 644 void __use_cond_states(void);
 645 extern struct state_list *__last_base_slist;
 646
 647 void __push_continues(void);
 648 void __discard_continues(void);
 649 void __process_continues(void);
 650 void __merge_continues(void);
 651
 652 void __push_breaks(void);
 653 void __process_breaks(void);
 654 int __has_breaks(void);
 655 void __merge_breaks(void);
 656 void __use_breaks(void);
 657
 658 void __save_switch_states(struct expression *switch_expr);
 659 void __discard_switches(void);
 660 int have_remaining_cases(void);
 661 void __merge_switches(struct expression *switch_expr, struct range_list *case_rl);
 662 void __push_default(void);
 663 void __set_default(void);
 664 int __pop_default(void);
 665
 666 void __push_conditions(void);
 667 void __discard_conditions(void);
 668
 669 void __save_gotos(const char *name, struct symbol *sym);
 670 void __merge_gotos(const char *name, struct symbol *sym);
 671
 672 void __print_cur_stree(void);
 673
 674 /* smatch_hooks.c */
 675 void __pass_to_client(void *data, enum hook_type type);
 676 void __pass_to_client_no_data(enum hook_type type);
 677 void __pass_case_to_client(struct expression *switch_expr,
 678                            struct range_list *rl);
 679 int __has_merge_function(int client_id);
 680 struct smatch_state *__client_merge_function(int owner,
 681                                              struct smatch_state *s1,
 682                                              struct smatch_state *s2);
 683 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 684 void call_pre_merge_hook(struct sm_state *sm);
 685 void __push_scope_hooks(void);
 686 void __call_scope_hooks(void);
 687
 688 /* smatch_function_hooks.c */
 689 void create_function_hook_hash(void);
 690 void __match_initializer_call(struct symbol *sym);
 691
 692 /* smatch_db.c */
 693 enum info_type {
 694         INTERNAL        = 0,
 695         /*
 696          * Changing these numbers is a pain.  Don't do it.  If you ever use a
 697          * number it can't be re-used right away so there may be gaps.
 698          * We select these in order by type so if the order matters, then give
 699          * it a number below 100-999,9000-9999 ranges. */
 700
 701         PARAM_CLEARED   = 101,
 702         PARAM_LIMIT     = 103,
 703         PARAM_FILTER    = 104,
 704
 705         PARAM_VALUE     = 1001,
 706         BUF_SIZE        = 1002,
 707         USER_DATA       = 1003,
 708         CAPPED_DATA     = 1004,
 709         RETURN_VALUE    = 1005,
 710         DEREFERENCE     = 1006,
 711         RANGE_CAP       = 1007,
 712         LOCK_HELD       = 1008,
 713         LOCK_RELEASED   = 1009,
 714         ABSOLUTE_LIMITS = 1010,
 715         PARAM_ADD       = 1012,
 716         PARAM_FREED     = 1013,
 717         DATA_SOURCE     = 1014,
 718         FUZZY_MAX       = 1015,
 719         STR_LEN         = 1016,
 720         ARRAY_LEN       = 1017,
 721         CAPABLE         = 1018,
 722         NS_CAPABLE      = 1019,
 723         CONTAINER       = 1020,
 724         CASTED_CALL     = 1021,
 725         TYPE_LINK       = 1022,
 726         UNTRACKED_PARAM = 1023,
 727         CULL_PATH       = 1024,
 728         PARAM_SET       = 1025,
 729         PARAM_USED      = 1026,
 730         BYTE_UNITS      = 1027,
 731         COMPARE_LIMIT   = 1028,
 732         PARAM_COMPARE   = 1029,
 733         CONSTRAINT      = 1031,
 734         PASSES_TYPE     = 1032,
 735         CONSTRAINT_REQUIRED = 1033,
 736
 737         /* put random temporary stuff in the 7000-7999 range for testing */
 738         USER_DATA3      = 8017,
 739         USER_DATA3_SET  = 9017,
 740         NO_OVERFLOW     = 8018,
 741         NO_OVERFLOW_SIMPLE = 8019,
 742         LOCKED          = 8020,
 743         UNLOCKED        = 8021,
 744         SET_FS          = 8022,
 745         ATOMIC_INC      = 8023,
 746         ATOMIC_DEC      = 8024,
 747         NO_SIDE_EFFECT  = 8025,
 748         FN_ARG_LINK     = 8028,
 749         DATA_VALUE      = 8029,
 750         ARRAYSIZE_ARG   = 8033,
 751         SIZEOF_ARG      = 8034,
 752         MEMORY_TAG      = 8036,
 753         MTAG_ASSIGN     = 8035,
 754 };
 755
 756 void debug_sql(const char *sql);
 757 void debug_mem_sql(const char *sql);
 758 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 759 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm));
 760 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr));
 761 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));
 762 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value));
 763 struct range_list *db_return_vals(struct expression *expr);
 764 struct range_list *db_return_vals_from_str(const char *fn_name);
 765 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym);
 766 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl);
 767 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym);
 768 const char *state_name_to_param_name(const char *state_name, const char *param_name);
 769 const char *get_param_name_var_sym(const char *name, struct symbol *sym);
 770 const char *get_param_name(struct sm_state *sm);
 771 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym);
 772 const char *get_mtag_name_expr(struct expression *expr);
 773 char *get_data_info_name(struct expression *expr);
 774
 775 #define run_sql(call_back, data, sql...)    \
 776 do {                                  \
 777         char sql_txt[1024];           \
 778         if (option_no_db)             \
 779                 break;                \
 780         snprintf(sql_txt, 1024, sql); \
 781         debug_sql(sql_txt);           \
 782         sql_exec(call_back, data, sql_txt); \
 783 } while (0)
 784
 785 /* like run_sql() but for the in-memory database */
 786 #define mem_sql(call_back, data, sql...)                                                \
 787 do {                                                                            \
 788         char sql_txt[1024];                                                     \
 789                                                                                 \
 790         snprintf(sql_txt, sizeof(sql_txt), sql);                                \
 791         sm_debug("in-mem: %s\n", sql_txt);                                      \
 792         debug_mem_sql(sql_txt);                                                 \
 793         sql_mem_exec(call_back, data, sql_txt);                                 \
 794 } while (0)
 795
 796 char *get_static_filter(struct symbol *sym);
 797
 798 void sql_insert_return_states(int return_id, const char *return_ranges,
 799                 int type, int param, const char *key, const char *value);
 800 void sql_insert_caller_info(struct expression *call, int type, int param,
 801                 const char *key, const char *value);
 802 void sql_insert_function_ptr(const char *fn, const char *struct_name);
 803 void sql_insert_return_values(const char *return_values);
 804 void sql_insert_call_implies(int type, int param, const char *key, const char *value);
 805 void sql_insert_function_type_size(const char *member, const char *ranges);
 806 void sql_insert_local_values(const char *name, const char *value);
 807 void sql_insert_function_type_value(const char *type, const char *value);
 808 void sql_insert_function_type(int param, const char *value);
 809 void sql_insert_parameter_name(int param, const char *value);
 810 void sql_insert_data_info(struct expression *data, int type, const char *value);
 811 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value);
 812 void sql_save_constraint(const char *con);
 813 void sql_save_constraint_required(const char *data, int op, const char *limit);
 814 void sql_copy_constraint_required(const char *new_limit, const char *old_limit);
 815 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data);
 816 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value);
 817 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name);
 818 void insert_mtag_data(mtag_t tag, int offset, struct range_list *rl);
 819 void sql_insert_mtag_map(mtag_t tag, int offset, mtag_t container);
 820 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias);
 821 int mtag_map_select_container(mtag_t tag, int offset, mtag_t *container);
 822 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag);
 823
 824 void sql_select_return_states(const char *cols, struct expression *call,
 825         int (*callback)(void*, int, char**, char**), void *info);
 826 void sql_select_call_implies(const char *cols, struct expression *call,
 827         int (*callback)(void*, int, char**, char**));
 828
 829 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 830 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 831
 832 void open_smatch_db(void);
 833
 834 /* smatch_files.c */
 835 int open_data_file(const char *filename);
 836 struct token *get_tokens_file(const char *filename);
 837
 838 /* smatch.c */
 839 extern char *option_debug_check;
 840 extern char *option_project_str;
 841 extern char *data_dir;
 842 extern int option_no_data;
 843 extern int option_full_path;
 844 extern int option_param_mapper;
 845 extern int option_call_tree;
 846 extern int num_checks;
 847
 848 enum project_type {
 849         PROJ_NONE,
 850         PROJ_KERNEL,
 851         PROJ_WINE,
 852         PROJ_UNKNOWN,
 853 };
 854 extern enum project_type option_project;
 855 const char *check_name(unsigned short id);
 856 int id_from_name(const char *name);
 857
 858
 859 /* smatch_buf_size.c */
 860 int get_array_size(struct expression *expr);
 861 int get_array_size_bytes(struct expression *expr);
 862 int get_array_size_bytes_min(struct expression *expr);
 863 int get_array_size_bytes_max(struct expression *expr);
 864 struct range_list *get_array_size_bytes_rl(struct expression *expr);
 865 int get_real_array_size(struct expression *expr);
 866 int last_member_is_resizable(struct symbol *type);
 867 /* smatch_strlen.c */
 868 int get_implied_strlen(struct expression *expr, struct range_list **rl);
 869 int get_size_from_strlen(struct expression *expr);
 870
 871 /* smatch_capped.c */
 872 int is_capped(struct expression *expr);
 873 int is_capped_var_sym(const char *name, struct symbol *sym);
 874
 875 /* check_user_data.c */
 876 int is_user_macro(struct expression *expr);
 877 int is_user_data(struct expression *expr);
 878 int is_capped_user_data(struct expression *expr);
 879 int implied_user_data(struct expression *expr, struct range_list **rl);
 880 int get_user_rl(struct expression *expr, struct range_list **rl);
 881 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl);
 882
 883 /* check_locking.c */
 884 void print_held_locks();
 885
 886 /* check_assigned_expr.c */
 887 struct expression *get_assigned_expr(struct expression *expr);
 888 struct expression *get_assigned_expr_name_sym(const char *name, struct symbol *sym);
 889 /* smatch_return_to_param.c */
 890 void __add_return_to_param_mapping(struct expression *assign, const char *return_string);
 891 char *map_call_to_param_name_sym(struct expression *expr, struct symbol **sym);
 892
 893 /* smatch_comparison.c */
 894 struct compare_data {
 895         /* The ->left and ->right expression pointers might be NULL (I'm lazy) */
 896         struct expression *left;
 897         const char *left_var;
 898         struct var_sym_list *left_vsl;
 899         int comparison;
 900         struct expression *right;
 901         const char *right_var;
 902         struct var_sym_list *right_vsl;
 903 };
 904 DECLARE_ALLOCATOR(compare_data);
 905 struct smatch_state *alloc_compare_state(
 906                 struct expression *left,
 907                 const char *left_var, struct var_sym_list *left_vsl,
 908                 int comparison,
 909                 struct expression *right,
 910                 const char *right_var, struct var_sym_list *right_vsl);
 911 int merge_comparisons(int one, int two);
 912 int combine_comparisons(int left_compare, int right_compare);
 913 int state_to_comparison(struct smatch_state *state);
 914 struct smatch_state *merge_compare_states(struct smatch_state *s1, struct smatch_state *s2);
 915 int get_comparison(struct expression *left, struct expression *right);
 916 int get_comparison_strings(const char *one, const char *two);
 917 int possible_comparison(struct expression *a, int comparison, struct expression *b);
 918 struct state_list *get_all_comparisons(struct expression *expr);
 919 struct state_list *get_all_possible_equal_comparisons(struct expression *expr);
 920 void __add_return_comparison(struct expression *call, const char *range);
 921 void __add_comparison_info(struct expression *expr, struct expression *call, const char *range);
 922 char *get_printed_param_name(struct expression *call, const char *param_name, struct symbol *param_sym);
 923 char *name_sym_to_param_comparison(const char *name, struct symbol *sym);
 924 char *expr_equal_to_param(struct expression *expr, int ignore);
 925 char *expr_lte_to_param(struct expression *expr, int ignore);
 926 char *expr_param_comparison(struct expression *expr, int ignore);
 927 int flip_comparison(int op);
 928 int negate_comparison(int op);
 929 int remove_unsigned_from_comparison(int op);
 930 int param_compare_limit_is_impossible(struct expression *expr, int left_param, char *left_key, char *value);
 931 void filter_by_comparison(struct range_list **rl, int comparison, struct range_list *right);
 932 struct sm_state *comparison_implication_hook(struct expression *expr,
 933                         struct state_list **true_stack,
 934                         struct state_list **false_stack);
 935 void __compare_param_limit_hook(struct expression *left_expr, struct expression *right_expr,
 936                                 const char *state_name,
 937                                 struct smatch_state *true_state, struct smatch_state *false_state);
 938
 939
 940 /* smatch_sval.c */
 941 sval_t *sval_alloc(sval_t sval);
 942 sval_t *sval_alloc_permanent(sval_t sval);
 943 sval_t sval_blank(struct expression *expr);
 944 sval_t sval_type_val(struct symbol *type, long long val);
 945 sval_t sval_from_val(struct expression *expr, long long val);
 946 int sval_unsigned(sval_t sval);
 947 int sval_signed(sval_t sval);
 948 int sval_bits(sval_t sval);
 949 int sval_bits_used(sval_t sval);
 950 int sval_is_negative(sval_t sval);
 951 int sval_is_positive(sval_t sval);
 952 int sval_is_min(sval_t sval);
 953 int sval_is_max(sval_t sval);
 954 int sval_is_a_min(sval_t sval);
 955 int sval_is_a_max(sval_t sval);
 956 int sval_is_negative_min(sval_t sval);
 957 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
 958 int sval_cmp_val(sval_t one, long long val);
 959 sval_t sval_min(sval_t one, sval_t two);
 960 sval_t sval_max(sval_t one, sval_t two);
 961 int sval_too_low(struct symbol *type, sval_t sval);
 962 int sval_too_high(struct symbol *type, sval_t sval);
 963 int sval_fits(struct symbol *type, sval_t sval);
 964 sval_t sval_cast(struct symbol *type, sval_t sval);
 965 sval_t sval_preop(sval_t sval, int op);
 966 sval_t sval_binop(sval_t left, int op, sval_t right);
 967 int sval_binop_overflows(sval_t left, int op, sval_t right);
 968 unsigned long long fls_mask(unsigned long long uvalue);
 969 unsigned long long sval_fls_mask(sval_t sval);
 970 const char *sval_to_str(sval_t sval);
 971 const char *sval_to_numstr(sval_t sval);
 972 sval_t ll_to_sval(long long val);
 973
 974 /* smatch_string_list.c */
 975 int list_has_string(struct string_list *str_list, const char *str);
 976 void insert_string(struct string_list **str_list, const char *str);
 977 struct string_list *clone_str_list(struct string_list *orig);
 978 struct string_list *combine_string_lists(struct string_list *one, struct string_list *two);
 979
 980 /* smatch_start_states.c */
 981 struct stree *get_start_states(void);
 982
 983 /* smatch_recurse.c */
 984 int has_symbol(struct expression *expr, struct symbol *sym);
 985 int has_variable(struct expression *expr, struct expression *var);
 986 int has_inc_dec(struct expression *expr);
 987
 988 /* smatch_stored_conditions.c */
 989 struct smatch_state *get_stored_condition(struct expression *expr);
 990 struct expression_list *get_conditions(struct expression *expr);
 991 struct sm_state *stored_condition_implication_hook(struct expression *expr,
 992                         struct state_list **true_stack,
 993                         struct state_list **false_stack);
 994
 995 /* check_string_len.c */
 996 int get_formatted_string_size(struct expression *call, int arg);
 997
 998 /* smatch_param_set.c */
 999 int param_was_set(struct expression *expr);
1000 int param_was_set_var_sym(const char *name, struct symbol *sym);
1001 /* smatch_param_filter.c */
1002 int param_has_filter_data(struct sm_state *sm);
1003
1004 /* smatch_links.c */
1005 void set_up_link_functions(int id, int linkid);
1006 struct smatch_state *merge_link_states(struct smatch_state *s1, struct smatch_state *s2);
1007 void store_link(int link_id, const char *name, struct symbol *sym, const char *link_name, struct symbol *link_sym);
1008
1009 /* smatch_auto_copy.c */
1010 void set_auto_copy(int owner);
1011
1012 /* check_buf_comparison */
1013 struct expression *get_size_variable(struct expression *buf);
1014 struct expression *get_array_variable(struct expression *size);
1015
1016 /* smatch_untracked_param.c */
1017 void mark_untracked(struct expression *expr, int param, const char *key, const char *value);
1018 void add_untracked_param_hook(void (func)(struct expression *call, int param));
1019
1020 /* smatch_strings.c */
1021 struct state_list *get_strings(struct expression *expr);
1022
1023 /* smatch_estate.c */
1024 int estate_get_single_value(struct smatch_state *state, sval_t *sval);
1025
1026 /* smatch_address.c */
1027 int get_address_rl(struct expression *expr, struct range_list **rl);
1028 int get_member_offset(struct symbol *type, const char *member_name);
1029 int get_member_offset_from_deref(struct expression *expr);
1030
1031 /* for now this is in smatch_used_parameter.c */
1032 void __get_state_hook(int owner, const char *name, struct symbol *sym);
1033
1034 /* smatch_buf_comparison.c */
1035 int db_var_is_array_limit(struct expression *array, const char *name, struct var_sym_list *vsl);
1036
1037 struct stree *get_all_return_states(void);
1038 struct stree_stack *get_all_return_strees(void);
1039 int on_atomic_dec_path(void);
1040 int was_inced(const char *name, struct symbol *sym);
1041
1042 /* smatch_constraints.c */
1043 char *get_constraint_str(struct expression *expr);
1044 struct constraint_list *get_constraints(struct expression *expr);
1045 char *unmet_constraint(struct expression *data, struct expression *offset);
1046 char *get_required_constraint(const char *data_str);
1047
1048 /* smatch_container_of.c */
1049 int get_param_from_container_of(struct expression *expr);
1050 int get_offset_from_container_of(struct expression *expr);
1051
1052 /* smatch_mtag.c */
1053 int get_toplevel_mtag(struct symbol *sym, mtag_t *tag);
1054 int get_mtag(struct expression *expr, mtag_t *tag);
1055 int get_mtag_offset(struct expression *expr);
1056 int create_mtag_alias(mtag_t tag, struct expression *expr, mtag_t *new);
1057 int expr_to_mtag_name_offset(struct expression *expr, mtag_t *tag, char **name, int *offset);
1058 void update_mtag_data(struct expression *expr);
1059
1060 static inline int type_bits(struct symbol *type)
1061 {
1062         if (!type)
1063                 return 0;
1064         if (type->type == SYM_PTR)  /* Sparse doesn't set this for &pointers */
1065                 return bits_in_pointer;
1066         if (type->type == SYM_ARRAY)
1067                 return bits_in_pointer;
1068         if (!type->examined)
1069                 examine_symbol_type(type);
1070         return type->bit_size;
1071 }
1072
1073 static inline int type_unsigned(struct symbol *base_type)
1074 {
1075         if (!base_type)
1076                 return 0;
1077         if (base_type->ctype.modifiers & MOD_UNSIGNED)
1078                 return 1;
1079         return 0;
1080 }
1081
1082 static inline int type_positive_bits(struct symbol *type)
1083 {
1084         if (!type)
1085                 return 0;
1086         if (type->type == SYM_ARRAY)
1087                 return bits_in_pointer - 1;
1088         if (type_unsigned(type))
1089                 return type_bits(type);
1090         return type_bits(type) - 1;
1091 }
1092
1093 static inline int sval_positive_bits(sval_t sval)
1094 {
1095         return type_positive_bits(sval.type);
1096 }
1097
1098 /*
1099  * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
1100  */
1101 static inline int sval_cmp(sval_t one, sval_t two)
1102 {
1103         struct symbol *type;
1104
1105         type = one.type;
1106         if (sval_positive_bits(two) > sval_positive_bits(one))
1107                 type = two.type;
1108         if (type_bits(type) < 31)
1109                 type = &int_ctype;
1110
1111         one = sval_cast(type, one);
1112         two = sval_cast(type, two);
1113
1114         if (type_unsigned(type)) {
1115                 if (one.uvalue < two.uvalue)
1116                         return -1;
1117                 if (one.uvalue == two.uvalue)
1118                         return 0;
1119                 return 1;
1120         }
1121         /* fix me handle type promotion and unsigned values */
1122         if (one.value < two.value)
1123                 return -1;
1124         if (one.value == two.value)
1125                 return 0;
1126         return 1;
1127 }
1128
1129 #endif      /* !SMATCH_H_ */