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 <sqlite3.h>
  26 #include "lib.h"
  27 #include "allocate.h"
  28 #include "scope.h"
  29 #include "parse.h"
  30 #include "expression.h"
  31 #include "avl.h"
  32
  33 typedef struct {
  34         struct symbol *type;
  35         union {
  36                 long long value;
  37                 unsigned long long uvalue;
  38         };
  39 } sval_t;
  40
  41 typedef long long mtag_t;
  42
  43 struct smatch_state {
  44         const char *name;
  45         void *data;
  46 };
  47 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  48 extern struct smatch_state undefined;
  49 extern struct smatch_state ghost;
  50 extern struct smatch_state merged;
  51 extern struct smatch_state true_state;
  52 extern struct smatch_state false_state;
  53 DECLARE_ALLOCATOR(smatch_state);
  54
  55 static inline void *INT_PTR(int i)
  56 {
  57         return (void *)(long)i;
  58 }
  59
  60 static inline int PTR_INT(void *p)
  61 {
  62         return (int)(long)p;
  63 }
  64
  65 struct tracker {
  66         char *name;
  67         struct symbol *sym;
  68         unsigned short owner;
  69 };
  70 DECLARE_ALLOCATOR(tracker);
  71 DECLARE_PTR_LIST(tracker_list, struct tracker);
  72 DECLARE_PTR_LIST(stree_stack, struct stree);
  73
  74 /* The first 3 struct members must match struct tracker */
  75 struct sm_state {
  76         const char *name;
  77         struct symbol *sym;
  78         unsigned short owner;
  79         unsigned short merged:1;
  80         unsigned short skip_implications:1;
  81         unsigned int nr_children;
  82         unsigned int line;
  83         struct smatch_state *state;
  84         struct stree *pool;
  85         struct sm_state *left;
  86         struct sm_state *right;
  87         struct state_list *possible;
  88 };
  89
  90 struct var_sym {
  91         char *var;
  92         struct symbol *sym;
  93 };
  94 DECLARE_ALLOCATOR(var_sym);
  95 DECLARE_PTR_LIST(var_sym_list, struct var_sym);
  96
  97 struct constraint {
  98         int op;
  99         int id;
 100 };
 101 DECLARE_PTR_LIST(constraint_list, struct constraint);
 102
 103 enum hook_type {
 104         EXPR_HOOK,
 105         STMT_HOOK,
 106         STMT_HOOK_AFTER,
 107         SYM_HOOK,
 108         STRING_HOOK,
 109         DECLARATION_HOOK,
 110         ASSIGNMENT_HOOK,
 111         ASSIGNMENT_HOOK_AFTER,
 112         RAW_ASSIGNMENT_HOOK,
 113         GLOBAL_ASSIGNMENT_HOOK,
 114         LOGIC_HOOK,
 115         CONDITION_HOOK,
 116         PRELOOP_HOOK,
 117         SELECT_HOOK,
 118         WHOLE_CONDITION_HOOK,
 119         FUNCTION_CALL_HOOK_BEFORE,
 120         FUNCTION_CALL_HOOK,
 121         CALL_HOOK_AFTER_INLINE,
 122         FUNCTION_CALL_HOOK_AFTER_DB,
 123         CALL_ASSIGNMENT_HOOK,
 124         MACRO_ASSIGNMENT_HOOK,
 125         BINOP_HOOK,
 126         OP_HOOK,
 127         DEREF_HOOK,
 128         CASE_HOOK,
 129         ASM_HOOK,
 130         CAST_HOOK,
 131         SIZEOF_HOOK,
 132         BASE_HOOK,
 133         FUNC_DEF_HOOK,
 134         AFTER_DEF_HOOK,
 135         END_FUNC_HOOK,
 136         AFTER_FUNC_HOOK,
 137         RETURN_HOOK,
 138         INLINE_FN_START,
 139         INLINE_FN_END,
 140         END_FILE_HOOK,
 141         NUM_HOOKS,
 142 };
 143
 144 #define TRUE 1
 145 #define FALSE 0
 146
 147 struct range_list;
 148
 149 void add_hook(void *func, enum hook_type type);
 150 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 151 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 152 void add_merge_hook(int client_id, merge_func_t *func);
 153 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 154 void add_pre_merge_hook(int client_id, void (*hook)(struct sm_state *sm));
 155 typedef void (scope_hook)(void *data);
 156 void add_scope_hook(scope_hook *hook, void *data);
 157 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 158 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 159                                 struct expression *assign_expr, void *data);
 160 typedef void (return_implies_hook)(struct expression *call_expr,
 161                                    int param, char *key, char *value);
 162 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 163 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 164
 165 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 166                               void *info);
 167 void add_implied_return_hook(const char *look_for,
 168                              implied_return_hook *call_back,
 169                              void *info);
 170 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 171                               void *info);
 172 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 173                               void *info);
 174 void return_implies_state(const char *look_for, long long start, long long end,
 175                          implication_hook *call_back, void *info);
 176 void select_return_states_hook(int type, return_implies_hook *callback);
 177 void select_return_states_before(void (*fn)(void));
 178 void select_return_states_after(void (*fn)(void));
 179 int get_implied_return(struct expression *expr, struct range_list **rl);
 180 void allocate_hook_memory(void);
 181
 182 struct modification_data {
 183         struct smatch_state *prev;
 184         struct expression *cur;
 185 };
 186
 187 typedef void (modification_hook)(struct sm_state *sm, struct expression *mod_expr);
 188 void add_modification_hook(int owner, modification_hook *call_back);
 189 void add_modification_hook_late(int owner, modification_hook *call_back);
 190 struct smatch_state *get_modification_state(struct expression *expr);
 191
 192 int outside_of_function(void);
 193 const char *get_filename(void);
 194 const char *get_base_file(void);
 195 char *get_function(void);
 196 int get_lineno(void);
 197 extern int final_pass;
 198 extern struct symbol *cur_func_sym;
 199 extern int option_debug;
 200 extern int local_debug;
 201 extern int option_info;
 202 extern int option_spammy;
 203 extern char *trace_variable;
 204 extern struct stree *global_states;
 205 int is_silenced_function(void);
 206
 207 /* smatch_impossible.c */
 208 int is_impossible_path(void);
 209 void set_path_impossible(void);
 210
 211 extern FILE *sm_outfd;
 212 extern FILE *sql_outfd;
 213 extern FILE *caller_info_fd;
 214 #define sm_printf(msg...) do { if (final_pass || option_debug || local_debug) fprintf(sm_outfd, msg); } while (0)
 215
 216 static inline void sm_prefix(void)
 217 {
 218         sm_printf("%s:%d %s() ", get_filename(), get_lineno(), get_function());
 219 }
 220
 221 static inline void print_implied_debug_msg();
 222
 223 extern bool __silence_warnings_for_stmt;
 224
 225 #define sm_msg(msg...) \
 226 do {                                                           \
 227         print_implied_debug_msg();                             \
 228         if (!final_pass && !option_debug && !local_debug)      \
 229                 break;                                         \
 230         if (__silence_warnings_for_stmt && !option_debug && !local_debug) \
 231                 break;                                         \
 232         if (!option_info && is_silenced_function())            \
 233                 break;                                         \
 234         sm_prefix();                                           \
 235         sm_printf(msg);                                        \
 236         sm_printf("\n");                                       \
 237 } while (0)
 238
 239 #define local_debug(msg...)                                     \
 240 do {                                                            \
 241         if (local_debug)                                        \
 242                 sm_msg(msg);                                    \
 243 } while (0)
 244
 245 extern char *implied_debug_msg;
 246 static inline void print_implied_debug_msg(void)
 247 {
 248         static struct symbol *last_printed = NULL;
 249
 250         if (!implied_debug_msg)
 251                 return;
 252         if (last_printed == cur_func_sym)
 253                 return;
 254         last_printed = cur_func_sym;
 255         sm_msg("%s", implied_debug_msg);
 256 }
 257
 258 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 259
 260 #define sm_info(msg...) do {                                    \
 261         if (option_debug || (option_info && final_pass)) {      \
 262                 sm_prefix();                                    \
 263                 sm_printf("info: ");                            \
 264                 sm_printf(msg);                                 \
 265                 sm_printf("\n");                                \
 266         }                                                       \
 267 } while(0)
 268
 269 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
 270
 271 struct smatch_state *__get_state(int owner, const char *name, struct symbol *sym);
 272 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 273 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 274 struct state_list *get_possible_states(int owner, const char *name,
 275                                        struct symbol *sym);
 276 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 277 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 278                struct smatch_state *state);
 279 struct sm_state *set_state_expr(int owner, struct expression *expr,
 280                 struct smatch_state *state);
 281 void delete_state(int owner, const char *name, struct symbol *sym);
 282 void delete_state_expr(int owner, struct expression *expr);
 283 void __delete_all_states_sym(struct symbol *sym);
 284 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 285                            struct smatch_state *true_state,
 286                            struct smatch_state *false_state);
 287 void set_true_false_states_expr(int owner, struct expression *expr,
 288                            struct smatch_state *true_state,
 289                            struct smatch_state *false_state);
 290
 291 struct stree *get_all_states_from_stree(int owner, struct stree *source);
 292 struct stree *get_all_states_stree(int id);
 293 struct stree *__get_cur_stree(void);
 294 int is_reachable(void);
 295 void add_get_state_hook(void (*fn)(int owner, const char *name, struct symbol *sym));
 296
 297 /* smatch_helper.c */
 298 DECLARE_PTR_LIST(int_stack, int);
 299 char *alloc_string(const char *str);
 300 void free_string(char *str);
 301 void append(char *dest, const char *data, int buff_len);
 302 void remove_parens(char *str);
 303 struct smatch_state *alloc_state_num(int num);
 304 struct smatch_state *alloc_state_str(const char *name);
 305 struct smatch_state *alloc_state_expr(struct expression *expr);
 306 struct expression *get_argument_from_call_expr(struct expression_list *args,
 307                                                int num);
 308
 309 char *expr_to_var(struct expression *expr);
 310 struct symbol *expr_to_sym(struct expression *expr);
 311 char *expr_to_str(struct expression *expr);
 312 char *expr_to_str_sym(struct expression *expr,
 313                                      struct symbol **sym_ptr);
 314 char *expr_to_var_sym(struct expression *expr,
 315                              struct symbol **sym_ptr);
 316 char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
 317 char *expr_to_chunk_sym_vsl(struct expression *expr, struct symbol **sym, struct var_sym_list **vsl);
 318 int get_complication_score(struct expression *expr);
 319
 320 int sym_name_is(const char *name, struct expression *expr);
 321 int get_const_value(struct expression *expr, sval_t *sval);
 322 int get_value(struct expression *expr, sval_t *val);
 323 int get_implied_value(struct expression *expr, sval_t *val);
 324 int get_implied_min(struct expression *expr, sval_t *sval);
 325 int get_implied_max(struct expression *expr, sval_t *val);
 326 int get_hard_max(struct expression *expr, sval_t *sval);
 327 int get_fuzzy_min(struct expression *expr, sval_t *min);
 328 int get_fuzzy_max(struct expression *expr, sval_t *max);
 329 int get_absolute_min(struct expression *expr, sval_t *sval);
 330 int get_absolute_max(struct expression *expr, sval_t *sval);
 331 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 332 int parse_call_math_rl(struct expression *call, char *math, struct range_list **rl);
 333 char *get_value_in_terms_of_parameter_math(struct expression *expr);
 334 char *get_value_in_terms_of_parameter_math_var_sym(const char *var, struct symbol *sym);
 335 int is_zero(struct expression *expr);
 336 int known_condition_true(struct expression *expr);
 337 int known_condition_false(struct expression *expr);
 338 int implied_condition_true(struct expression *expr);
 339 int implied_condition_false(struct expression *expr);
 340 int can_integer_overflow(struct symbol *type, struct expression *expr);
 341 void clear_math_cache(void);
 342
 343 int is_array(struct expression *expr);
 344 struct expression *get_array_base(struct expression *expr);
 345 struct expression *get_array_offset(struct expression *expr);
 346 const char *show_state(struct smatch_state *state);
 347 struct statement *get_expression_statement(struct expression *expr);
 348 struct expression *strip_parens(struct expression *expr);
 349 struct expression *strip_expr(struct expression *expr);
 350 void scoped_state(int my_id, const char *name, struct symbol *sym);
 351 int is_error_return(struct expression *expr);
 352 int getting_address(void);
 353 int get_struct_and_member(struct expression *expr, const char **type, const char **member);
 354 char *get_member_name(struct expression *expr);
 355 char *get_fnptr_name(struct expression *expr);
 356 int cmp_pos(struct position pos1, struct position pos2);
 357 int positions_eq(struct position pos1, struct position pos2);
 358 struct statement *get_current_statement(void);
 359 struct statement *get_prev_statement(void);
 360 struct expression *get_last_expr_from_expression_stmt(struct expression *expr);
 361 int get_param_num_from_sym(struct symbol *sym);
 362 int get_param_num(struct expression *expr);
 363 int ms_since(struct timeval *start);
 364 int parent_is_gone_var_sym(const char *name, struct symbol *sym);
 365 int parent_is_gone(struct expression *expr);
 366 int invert_op(int op);
 367 int expr_equiv(struct expression *one, struct expression *two);
 368 void push_int(struct int_stack **stack, int num);
 369 int pop_int(struct int_stack **stack);
 370
 371 /* smatch_type.c */
 372 struct symbol *get_real_base_type(struct symbol *sym);
 373 int type_bytes(struct symbol *type);
 374 int array_bytes(struct symbol *type);
 375 struct symbol *get_pointer_type(struct expression *expr);
 376 struct symbol *get_type(struct expression *expr);
 377 int type_signed(struct symbol *base_type);
 378 int expr_unsigned(struct expression *expr);
 379 int expr_signed(struct expression *expr);
 380 int returns_unsigned(struct symbol *base_type);
 381 int is_pointer(struct expression *expr);
 382 int returns_pointer(struct symbol *base_type);
 383 sval_t sval_type_max(struct symbol *base_type);
 384 sval_t sval_type_min(struct symbol *base_type);
 385 int nr_bits(struct expression *expr);
 386 int is_void_pointer(struct expression *expr);
 387 int is_char_pointer(struct expression *expr);
 388 int is_string(struct expression *expr);
 389 int is_static(struct expression *expr);
 390 int is_local_variable(struct expression *expr);
 391 int types_equiv(struct symbol *one, struct symbol *two);
 392 int fn_static(void);
 393 const char *global_static();
 394 struct symbol *cur_func_return_type(void);
 395 struct symbol *get_arg_type(struct expression *fn, int arg);
 396 struct symbol *get_member_type_from_key(struct expression *expr, const char *key);
 397 int is_struct(struct expression *expr);
 398 char *type_to_str(struct symbol *type);
 399
 400 /* smatch_ignore.c */
 401 void add_ignore(int owner, const char *name, struct symbol *sym);
 402 int is_ignored(int owner, const char *name, struct symbol *sym);
 403 void add_ignore_expr(int owner, struct expression *expr);
 404 int is_ignored_expr(int owner, struct expression *expr);
 405
 406 /* smatch_var_sym */
 407 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym);
 408 struct var_sym_list *expr_to_vsl(struct expression *expr);
 409 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 410 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr);
 411 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 412 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym);
 413 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl);
 414 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src);
 415 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two);
 416 int var_sym_lists_equiv(struct var_sym_list *one, struct var_sym_list *two);
 417 void free_var_sym_list(struct var_sym_list **list);
 418 void free_var_syms_and_list(struct var_sym_list **list);
 419
 420 /* smatch_tracker */
 421 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 422 void add_tracker(struct tracker_list **list, int owner, const char *name,
 423                 struct symbol *sym);
 424 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 425 void del_tracker(struct tracker_list **list, int owner, const char *name,
 426                 struct symbol *sym);
 427 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 428                 struct symbol *sym);
 429 void free_tracker_list(struct tracker_list **list);
 430 void free_trackers_and_list(struct tracker_list **list);
 431
 432 /* smatch_conditions */
 433 int in_condition(void);
 434
 435 /* smatch_flow.c */
 436
 437 extern int __in_fake_assign;
 438 extern int __in_fake_struct_assign;
 439 void smatch (int argc, char **argv);
 440 int inside_loop(void);
 441 int definitely_inside_loop(void);
 442 struct expression *get_switch_expr(void);
 443 int in_expression_statement(void);
 444 void __process_post_op_stack(void);
 445 void __split_expr(struct expression *expr);
 446 void __split_label_stmt(struct statement *stmt);
 447 void __split_stmt(struct statement *stmt);
 448 extern int __in_function_def;
 449 extern int option_assume_loops;
 450 extern int option_two_passes;
 451 extern int option_no_db;
 452 extern int option_file_output;
 453 extern int option_time;
 454 extern struct expression_list *big_expression_stack;
 455 extern struct expression_list *big_condition_stack;
 456 extern struct statement_list *big_statement_stack;
 457 int is_assigned_call(struct expression *expr);
 458 int inlinable(struct expression *expr);
 459 extern int __inline_call;
 460 extern struct expression *__inline_fn;
 461 extern int __in_pre_condition;
 462 extern int __bail_on_rest_of_function;
 463 extern struct statement *__prev_stmt;
 464 extern struct statement *__cur_stmt;
 465 extern struct statement *__next_stmt;
 466 void init_fake_env(void);
 467 void end_fake_env(void);
 468 int time_parsing_function(void);
 469
 470 /* smatch_struct_assignment.c */
 471 struct expression *get_faked_expression(void);
 472 void __fake_struct_member_assignments(struct expression *expr);
 473
 474 /* smatch_project.c */
 475 int is_no_inline_function(const char *function);
 476
 477 /* smatch_conditions */
 478 void __split_whole_condition(struct expression *expr);
 479 void __handle_logic(struct expression *expr);
 480 int is_condition(struct expression *expr);
 481 int __handle_condition_assigns(struct expression *expr);
 482 int __handle_select_assigns(struct expression *expr);
 483 int __handle_expr_statement_assigns(struct expression *expr);
 484
 485 /* smatch_implied.c */
 486 extern int option_debug_implied;
 487 extern int option_debug_related;
 488 struct range_list_stack;
 489 void param_limit_implications(struct expression *expr, int param, char *key, char *value);
 490 struct stree *__implied_case_stree(struct expression *switch_expr,
 491                                    struct range_list *case_rl,
 492                                    struct range_list_stack **remaining_cases,
 493                                    struct stree **raw_stree);
 494 void overwrite_states_using_pool(struct sm_state *gate_sm, struct sm_state *pool_sm);
 495 int assume(struct expression *expr);
 496 void end_assume(void);
 497 int impossible_assumption(struct expression *left, int op, sval_t sval);
 498
 499 /* smatch_extras.c */
 500 #define SMATCH_EXTRA 5 /* this is my_id from smatch extra set in smatch.c */
 501 extern int RETURN_ID;
 502
 503 struct data_range {
 504         sval_t min;
 505         sval_t max;
 506 };
 507
 508 extern long long valid_ptr_min, valid_ptr_max;
 509 extern sval_t valid_ptr_min_sval, valid_ptr_max_sval;
 510 static const sval_t array_min_sval = {
 511         .type = &ptr_ctype,
 512         {.value = 100000},
 513 };
 514 static const sval_t array_max_sval = {
 515         .type = &ptr_ctype,
 516         {.value = 199999},
 517 };
 518 static const sval_t text_seg_min = {
 519         .type = &ptr_ctype,
 520         {.value = 100000000},
 521 };
 522 static const sval_t text_seg_max = {
 523         .type = &ptr_ctype,
 524         {.value = 177777777},
 525 };
 526 static const sval_t data_seg_min = {
 527         .type = &ptr_ctype,
 528         {.value = 200000000},
 529 };
 530 static const sval_t data_seg_max = {
 531         .type = &ptr_ctype,
 532         {.value = 277777777},
 533 };
 534 static const sval_t bss_seg_min = {
 535         .type = &ptr_ctype,
 536         {.value = 300000000},
 537 };
 538 static const sval_t bss_seg_max = {
 539         .type = &ptr_ctype,
 540         {.value = 377777777},
 541 };
 542 static const sval_t stack_seg_min = {
 543         .type = &ptr_ctype,
 544         {.value = 400000000},
 545 };
 546 static const sval_t stack_seg_max = {
 547         .type = &ptr_ctype,
 548         {.value = 477777777},
 549 };
 550 static const sval_t kmalloc_seg_min = {
 551         .type = &ptr_ctype,
 552         {.value = 500000000},
 553 };
 554 static const sval_t kmalloc_seg_max = {
 555         .type = &ptr_ctype,
 556         {.value = 577777777},
 557 };
 558 static const sval_t vmalloc_seg_min = {
 559         .type = &ptr_ctype,
 560         {.value = 600000000},
 561 };
 562 static const sval_t vmalloc_seg_max = {
 563         .type = &ptr_ctype,
 564         {.value = 677777777},
 565 };
 566 static const sval_t fn_ptr_min = {
 567         .type = &ptr_ctype,
 568         {.value = 700000000},
 569 };
 570 static const sval_t fn_ptr_max = {
 571         .type = &ptr_ctype,
 572         {.value = 777777777},
 573 };
 574
 575 char *get_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 576 char *map_call_to_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 577 char *map_long_to_short_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 578 char *map_long_to_short_name_sym_nostack(const char *name, struct symbol *sym, struct symbol **new_sym);
 579
 580 #define STRLEN_MAX_RET 1010101
 581
 582 /* smatch_absolute.c */
 583 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 584 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 585
 586 /* smatch_local_values.c */
 587 int get_local_rl(struct expression *expr, struct range_list **rl);
 588 int get_local_max_helper(struct expression *expr, sval_t *sval);
 589 int get_local_min_helper(struct expression *expr, sval_t *sval);
 590
 591 /* smatch_type_value.c */
 592 int get_db_type_rl(struct expression *expr, struct range_list **rl);
 593 /* smatch_data_val.c */
 594 int get_db_data_rl(struct expression *expr, struct range_list **rl);
 595
 596 /* smatch_states.c */
 597 void __swap_cur_stree(struct stree *stree);
 598 void __push_fake_cur_stree();
 599 struct stree *__pop_fake_cur_stree();
 600 void __free_fake_cur_stree();
 601 void __set_fake_cur_stree_fast(struct stree *stree);
 602 void __pop_fake_cur_stree_fast(void);
 603 void __merge_stree_into_cur(struct stree *stree);
 604
 605 int unreachable(void);
 606 void __set_sm(struct sm_state *sm);
 607 void __set_sm_cur_stree(struct sm_state *sm);
 608 void __set_sm_fake_stree(struct sm_state *sm);
 609 void __set_true_false_sm(struct sm_state *true_state,
 610                         struct sm_state *false_state);
 611 void nullify_path(void);
 612 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 613                                void *unused);
 614 void __unnullify_path(void);
 615 int __path_is_null(void);
 616 void save_all_states(void);
 617 void restore_all_states(void);
 618 void free_goto_stack(void);
 619 void clear_all_states(void);
 620
 621 struct sm_state *get_sm_state(int owner, const char *name,
 622                                 struct symbol *sym);
 623 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 624 void __push_true_states(void);
 625 void __use_false_states(void);
 626 void __discard_false_states(void);
 627 void __merge_false_states(void);
 628 void __merge_true_states(void);
 629
 630 void __negate_cond_stacks(void);
 631 void __use_pre_cond_states(void);
 632 void __use_cond_true_states(void);
 633 void __use_cond_false_states(void);
 634 void __push_cond_stacks(void);
 635 void __fold_in_set_states(void);
 636 void __free_set_states(void);
 637 struct stree *__copy_cond_true_states(void);
 638 struct stree *__copy_cond_false_states(void);
 639 struct stree *__pop_cond_true_stack(void);
 640 struct stree *__pop_cond_false_stack(void);
 641 void __and_cond_states(void);
 642 void __or_cond_states(void);
 643 void __save_pre_cond_states(void);
 644 void __discard_pre_cond_states(void);
 645 struct stree *__get_true_states(void);
 646 struct stree *__get_false_states(void);
 647 void __use_cond_states(void);
 648 extern struct state_list *__last_base_slist;
 649
 650 void __push_continues(void);
 651 void __discard_continues(void);
 652 void __process_continues(void);
 653 void __merge_continues(void);
 654
 655 void __push_breaks(void);
 656 void __process_breaks(void);
 657 int __has_breaks(void);
 658 void __merge_breaks(void);
 659 void __use_breaks(void);
 660
 661 void __save_switch_states(struct expression *switch_expr);
 662 void __discard_switches(void);
 663 int have_remaining_cases(void);
 664 void __merge_switches(struct expression *switch_expr, struct range_list *case_rl);
 665 void __push_default(void);
 666 void __set_default(void);
 667 int __pop_default(void);
 668
 669 void __push_conditions(void);
 670 void __discard_conditions(void);
 671
 672 void __save_gotos(const char *name, struct symbol *sym);
 673 void __merge_gotos(const char *name, struct symbol *sym);
 674
 675 void __print_cur_stree(void);
 676
 677 /* smatch_hooks.c */
 678 void __pass_to_client(void *data, enum hook_type type);
 679 void __pass_to_client_no_data(enum hook_type type);
 680 void __pass_case_to_client(struct expression *switch_expr,
 681                            struct range_list *rl);
 682 int __has_merge_function(int client_id);
 683 struct smatch_state *__client_merge_function(int owner,
 684                                              struct smatch_state *s1,
 685                                              struct smatch_state *s2);
 686 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 687 void call_pre_merge_hook(struct sm_state *sm);
 688 void __push_scope_hooks(void);
 689 void __call_scope_hooks(void);
 690
 691 /* smatch_function_hooks.c */
 692 void create_function_hook_hash(void);
 693 void __match_initializer_call(struct symbol *sym);
 694
 695 /* smatch_db.c */
 696 enum info_type {
 697         INTERNAL        = 0,
 698         /*
 699          * Changing these numbers is a pain.  Don't do it.  If you ever use a
 700          * number it can't be re-used right away so there may be gaps.
 701          * We select these in order by type so if the order matters, then give
 702          * it a number below 100-999,9000-9999 ranges. */
 703
 704         PARAM_CLEARED   = 101,
 705         PARAM_LIMIT     = 103,
 706         PARAM_FILTER    = 104,
 707
 708         PARAM_VALUE     = 1001,
 709         BUF_SIZE        = 1002,
 710         USER_DATA       = 1003,
 711         CAPPED_DATA     = 1004,
 712         RETURN_VALUE    = 1005,
 713         DEREFERENCE     = 1006,
 714         RANGE_CAP       = 1007,
 715         LOCK_HELD       = 1008,
 716         LOCK_RELEASED   = 1009,
 717         ABSOLUTE_LIMITS = 1010,
 718         PARAM_ADD       = 1012,
 719         PARAM_FREED     = 1013,
 720         DATA_SOURCE     = 1014,
 721         FUZZY_MAX       = 1015,
 722         STR_LEN         = 1016,
 723         ARRAY_LEN       = 1017,
 724         CAPABLE         = 1018,
 725         NS_CAPABLE      = 1019,
 726         CONTAINER       = 1020,
 727         CASTED_CALL     = 1021,
 728         TYPE_LINK       = 1022,
 729         UNTRACKED_PARAM = 1023,
 730         CULL_PATH       = 1024,
 731         PARAM_SET       = 1025,
 732         PARAM_USED      = 1026,
 733         BYTE_UNITS      = 1027,
 734         COMPARE_LIMIT   = 1028,
 735         PARAM_COMPARE   = 1029,
 736         CONSTRAINT      = 1031,
 737         PASSES_TYPE     = 1032,
 738         CONSTRAINT_REQUIRED = 1033,
 739         NOSPEC          = 1035,
 740
 741         /* put random temporary stuff in the 7000-7999 range for testing */
 742         USER_DATA3      = 8017,
 743         USER_DATA3_SET  = 9017,
 744         NO_OVERFLOW     = 8018,
 745         NO_OVERFLOW_SIMPLE = 8019,
 746         LOCKED          = 8020,
 747         UNLOCKED        = 8021,
 748         SET_FS          = 8022,
 749         ATOMIC_INC      = 8023,
 750         ATOMIC_DEC      = 8024,
 751         NO_SIDE_EFFECT  = 8025,
 752         FN_ARG_LINK     = 8028,
 753         DATA_VALUE      = 8029,
 754         ARRAYSIZE_ARG   = 8033,
 755         SIZEOF_ARG      = 8034,
 756         MEMORY_TAG      = 8036,
 757         MTAG_ASSIGN     = 8035,
 758 };
 759
 760 extern struct sqlite3 *smatch_db;
 761 extern struct sqlite3 *mem_db;
 762 extern struct sqlite3 *cache_db;
 763
 764 void debug_sql(struct sqlite3 *db, const char *sql);
 765 void db_ignore_states(int id);
 766 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 767 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm));
 768 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr));
 769 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));
 770 void select_return_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value));
 771 struct range_list *db_return_vals(struct expression *expr);
 772 struct range_list *db_return_vals_from_str(const char *fn_name);
 773 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym);
 774 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl);
 775 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym);
 776 const char *state_name_to_param_name(const char *state_name, const char *param_name);
 777 const char *get_param_name_var_sym(const char *name, struct symbol *sym);
 778 const char *get_param_name(struct sm_state *sm);
 779 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym);
 780 const char *get_mtag_name_expr(struct expression *expr);
 781 char *get_data_info_name(struct expression *expr);
 782
 783 void sql_exec(struct sqlite3 *db, int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 784
 785 #define sql_helper(db, call_back, data, sql...)                                 \
 786 do {                                                                            \
 787         char sql_txt[1024];                                                     \
 788                                                                                 \
 789         snprintf(sql_txt, sizeof(sql_txt), sql);                                \
 790         sm_debug("debug: %s\n", sql_txt);                                       \
 791         debug_sql(db, sql_txt);                                                 \
 792         sql_exec(db, call_back, data, sql_txt);                                 \
 793 } while (0)
 794
 795
 796 #define run_sql(call_back, data, sql...)                                        \
 797 do {                                                                            \
 798         if (option_no_db)                                                       \
 799                 break;                                                          \
 800         sql_helper(smatch_db, call_back, data, sql);                            \
 801 } while (0)
 802
 803 #define mem_sql(call_back, data, sql...)                                        \
 804         sql_helper(mem_db, call_back, data, sql)
 805
 806 #define cache_sql(call_back, data, sql...)                                      \
 807         sql_helper(cache_db, call_back, data, sql)
 808
 809 #define sql_insert_helper(table, db, ignore, late, values...)                   \
 810 do {                                                                            \
 811         struct sqlite3 *_db = db;                                               \
 812                                                                                 \
 813         if (__inline_fn && !_db)                                                \
 814                 _db = mem_db;                                                   \
 815         if (_db) {                                                              \
 816                 char buf[1024];                                                 \
 817                 char *err, *p = buf;                                            \
 818                 int rc;                                                         \
 819                                                                                 \
 820                 p += snprintf(p, buf + sizeof(buf) - p,                         \
 821                               "insert %sinto %s values (",                      \
 822                               ignore ? "or ignore " : "", #table);              \
 823                 p += snprintf(p, buf + sizeof(buf) - p, values);                \
 824                 p += snprintf(p, buf + sizeof(buf) - p, ");");                  \
 825                 sm_debug("mem-db: %s\n", buf);                                  \
 826                 rc = sqlite3_exec(_db, buf, NULL, NULL, &err);                  \
 827                 if (rc != SQLITE_OK) {                                          \
 828                         fprintf(stderr, "SQL error #2: %s\n", err);             \
 829                         fprintf(stderr, "SQL: '%s'\n", buf);                    \
 830                         parse_error = 1;                                        \
 831                 }                                                               \
 832                 break;                                                          \
 833         }                                                                       \
 834         if (option_info) {                                                      \
 835                 FILE *tmp_fd = sm_outfd;                                        \
 836                 sm_outfd = sql_outfd;                                           \
 837                 sm_prefix();                                                    \
 838                 sm_printf("SQL%s: insert %sinto " #table " values(",            \
 839                           late ? "_late" : "", ignore ? "or ignore " : "");     \
 840                 sm_printf(values);                                              \
 841                 sm_printf(");\n");                                              \
 842                 sm_outfd = tmp_fd;                                              \
 843         }                                                                       \
 844 } while (0)
 845
 846 #define sql_insert(table, values...) sql_insert_helper(table, 0, 0, 0, values);
 847 #define sql_insert_or_ignore(table, values...) sql_insert_helper(table, 0, 1, 0, values);
 848 #define sql_insert_late(table, values...) sql_insert_helper(table, 0, 0, 1, values);
 849 #define sql_insert_cache(table, values...) sql_insert_helper(table, cache_db, 1, 0, values);
 850
 851 char *get_static_filter(struct symbol *sym);
 852
 853 void sql_insert_return_states(int return_id, const char *return_ranges,
 854                 int type, int param, const char *key, const char *value);
 855 void sql_insert_caller_info(struct expression *call, int type, int param,
 856                 const char *key, const char *value);
 857 void sql_insert_function_ptr(const char *fn, const char *struct_name);
 858 void sql_insert_return_values(const char *return_values);
 859 void sql_insert_return_implies(int type, int param, const char *key, const char *value);
 860 void sql_insert_function_type_size(const char *member, const char *ranges);
 861 void sql_insert_local_values(const char *name, const char *value);
 862 void sql_insert_function_type_value(const char *type, const char *value);
 863 void sql_insert_function_type(int param, const char *value);
 864 void sql_insert_parameter_name(int param, const char *value);
 865 void sql_insert_data_info(struct expression *data, int type, const char *value);
 866 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value);
 867 void sql_save_constraint(const char *con);
 868 void sql_save_constraint_required(const char *data, int op, const char *limit);
 869 void sql_copy_constraint_required(const char *new_limit, const char *old_limit);
 870 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data);
 871 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value);
 872 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name);
 873 void insert_mtag_data(mtag_t tag, int offset, struct range_list *rl);
 874 void sql_insert_mtag_map(mtag_t tag, int offset, mtag_t container);
 875 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias);
 876 int mtag_map_select_container(mtag_t tag, int offset, mtag_t *container);
 877 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag);
 878
 879 void sql_select_return_states(const char *cols, struct expression *call,
 880         int (*callback)(void*, int, char**, char**), void *info);
 881 void sql_select_call_implies(const char *cols, struct expression *call,
 882         int (*callback)(void*, int, char**, char**));
 883
 884 void open_smatch_db(void);
 885
 886 /* smatch_files.c */
 887 int open_data_file(const char *filename);
 888 struct token *get_tokens_file(const char *filename);
 889
 890 /* smatch.c */
 891 extern char *option_debug_check;
 892 extern char *option_project_str;
 893 extern char *data_dir;
 894 extern int option_no_data;
 895 extern int option_full_path;
 896 extern int option_param_mapper;
 897 extern int option_call_tree;
 898 extern int num_checks;
 899
 900 enum project_type {
 901         PROJ_NONE,
 902         PROJ_KERNEL,
 903         PROJ_WINE,
 904         PROJ_UNKNOWN,
 905 };
 906 extern enum project_type option_project;
 907 const char *check_name(unsigned short id);
 908 int id_from_name(const char *name);
 909
 910
 911 /* smatch_buf_size.c */
 912 int get_array_size(struct expression *expr);
 913 int get_array_size_bytes(struct expression *expr);
 914 int get_array_size_bytes_min(struct expression *expr);
 915 int get_array_size_bytes_max(struct expression *expr);
 916 struct range_list *get_array_size_bytes_rl(struct expression *expr);
 917 int get_real_array_size(struct expression *expr);
 918 int last_member_is_resizable(struct symbol *type);
 919 /* smatch_strlen.c */
 920 int get_implied_strlen(struct expression *expr, struct range_list **rl);
 921 int get_size_from_strlen(struct expression *expr);
 922
 923 /* smatch_capped.c */
 924 int is_capped(struct expression *expr);
 925 int is_capped_var_sym(const char *name, struct symbol *sym);
 926
 927 /* check_user_data.c */
 928 int is_user_macro(struct expression *expr);
 929 int is_user_data(struct expression *expr);
 930 int is_capped_user_data(struct expression *expr);
 931 int implied_user_data(struct expression *expr, struct range_list **rl);
 932 int get_user_rl(struct expression *expr, struct range_list **rl);
 933 int get_user_rl_spammy(struct expression *expr, struct range_list **rl);
 934 int is_user_rl(struct expression *expr);
 935 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl);
 936
 937 /* check_locking.c */
 938 void print_held_locks();
 939
 940 /* check_assigned_expr.c */
 941 struct expression *get_assigned_expr(struct expression *expr);
 942 struct expression *get_assigned_expr_name_sym(const char *name, struct symbol *sym);
 943 /* smatch_return_to_param.c */
 944 void __add_return_to_param_mapping(struct expression *assign, const char *return_string);
 945 char *map_call_to_param_name_sym(struct expression *expr, struct symbol **sym);
 946
 947 /* smatch_comparison.c */
 948 struct compare_data {
 949         /* The ->left and ->right expression pointers might be NULL (I'm lazy) */
 950         struct expression *left;
 951         const char *left_var;
 952         struct var_sym_list *left_vsl;
 953         int comparison;
 954         struct expression *right;
 955         const char *right_var;
 956         struct var_sym_list *right_vsl;
 957 };
 958 DECLARE_ALLOCATOR(compare_data);
 959 struct smatch_state *alloc_compare_state(
 960                 struct expression *left,
 961                 const char *left_var, struct var_sym_list *left_vsl,
 962                 int comparison,
 963                 struct expression *right,
 964                 const char *right_var, struct var_sym_list *right_vsl);
 965 int merge_comparisons(int one, int two);
 966 int combine_comparisons(int left_compare, int right_compare);
 967 int state_to_comparison(struct smatch_state *state);
 968 struct smatch_state *merge_compare_states(struct smatch_state *s1, struct smatch_state *s2);
 969 int get_comparison(struct expression *left, struct expression *right);
 970 int get_comparison_strings(const char *one, const char *two);
 971 int possible_comparison(struct expression *a, int comparison, struct expression *b);
 972 struct state_list *get_all_comparisons(struct expression *expr);
 973 struct state_list *get_all_possible_equal_comparisons(struct expression *expr);
 974 void __add_return_comparison(struct expression *call, const char *range);
 975 void __add_comparison_info(struct expression *expr, struct expression *call, const char *range);
 976 char *get_printed_param_name(struct expression *call, const char *param_name, struct symbol *param_sym);
 977 char *name_sym_to_param_comparison(const char *name, struct symbol *sym);
 978 char *expr_equal_to_param(struct expression *expr, int ignore);
 979 char *expr_lte_to_param(struct expression *expr, int ignore);
 980 char *expr_param_comparison(struct expression *expr, int ignore);
 981 int flip_comparison(int op);
 982 int negate_comparison(int op);
 983 int remove_unsigned_from_comparison(int op);
 984 int param_compare_limit_is_impossible(struct expression *expr, int left_param, char *left_key, char *value);
 985 void filter_by_comparison(struct range_list **rl, int comparison, struct range_list *right);
 986 struct sm_state *comparison_implication_hook(struct expression *expr,
 987                         struct state_list **true_stack,
 988                         struct state_list **false_stack);
 989 void __compare_param_limit_hook(struct expression *left_expr, struct expression *right_expr,
 990                                 const char *state_name,
 991                                 struct smatch_state *true_state, struct smatch_state *false_state);
 992 int impossibly_high_comparison(struct expression *expr);
 993
 994 /* smatch_sval.c */
 995 sval_t *sval_alloc(sval_t sval);
 996 sval_t *sval_alloc_permanent(sval_t sval);
 997 sval_t sval_blank(struct expression *expr);
 998 sval_t sval_type_val(struct symbol *type, long long val);
 999 sval_t sval_from_val(struct expression *expr, long long val);
1000 int sval_unsigned(sval_t sval);
1001 int sval_signed(sval_t sval);
1002 int sval_bits(sval_t sval);
1003 int sval_bits_used(sval_t sval);
1004 int sval_is_negative(sval_t sval);
1005 int sval_is_positive(sval_t sval);
1006 int sval_is_min(sval_t sval);
1007 int sval_is_max(sval_t sval);
1008 int sval_is_a_min(sval_t sval);
1009 int sval_is_a_max(sval_t sval);
1010 int sval_is_negative_min(sval_t sval);
1011 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
1012 int sval_cmp_val(sval_t one, long long val);
1013 sval_t sval_min(sval_t one, sval_t two);
1014 sval_t sval_max(sval_t one, sval_t two);
1015 int sval_too_low(struct symbol *type, sval_t sval);
1016 int sval_too_high(struct symbol *type, sval_t sval);
1017 int sval_fits(struct symbol *type, sval_t sval);
1018 sval_t sval_cast(struct symbol *type, sval_t sval);
1019 sval_t sval_preop(sval_t sval, int op);
1020 sval_t sval_binop(sval_t left, int op, sval_t right);
1021 int sval_binop_overflows(sval_t left, int op, sval_t right);
1022 unsigned long long fls_mask(unsigned long long uvalue);
1023 unsigned long long sval_fls_mask(sval_t sval);
1024 const char *sval_to_str(sval_t sval);
1025 const char *sval_to_numstr(sval_t sval);
1026 sval_t ll_to_sval(long long val);
1027
1028 /* smatch_string_list.c */
1029 int list_has_string(struct string_list *str_list, const char *str);
1030 void insert_string(struct string_list **str_list, const char *str);
1031 struct string_list *clone_str_list(struct string_list *orig);
1032 struct string_list *combine_string_lists(struct string_list *one, struct string_list *two);
1033
1034 /* smatch_start_states.c */
1035 struct stree *get_start_states(void);
1036
1037 /* smatch_recurse.c */
1038 int has_symbol(struct expression *expr, struct symbol *sym);
1039 int has_variable(struct expression *expr, struct expression *var);
1040 int has_inc_dec(struct expression *expr);
1041
1042 /* smatch_stored_conditions.c */
1043 struct smatch_state *get_stored_condition(struct expression *expr);
1044 struct expression_list *get_conditions(struct expression *expr);
1045 struct sm_state *stored_condition_implication_hook(struct expression *expr,
1046                         struct state_list **true_stack,
1047                         struct state_list **false_stack);
1048
1049 /* check_string_len.c */
1050 int get_formatted_string_size(struct expression *call, int arg);
1051
1052 /* smatch_param_set.c */
1053 int param_was_set(struct expression *expr);
1054 int param_was_set_var_sym(const char *name, struct symbol *sym);
1055 /* smatch_param_filter.c */
1056 int param_has_filter_data(struct sm_state *sm);
1057
1058 /* smatch_links.c */
1059 void set_up_link_functions(int id, int linkid);
1060 struct smatch_state *merge_link_states(struct smatch_state *s1, struct smatch_state *s2);
1061 void store_link(int link_id, const char *name, struct symbol *sym, const char *link_name, struct symbol *link_sym);
1062
1063 /* smatch_auto_copy.c */
1064 void set_auto_copy(int owner);
1065
1066 /* check_buf_comparison */
1067 struct expression *get_size_variable(struct expression *buf);
1068 struct expression *get_array_variable(struct expression *size);
1069
1070 /* smatch_untracked_param.c */
1071 void mark_untracked(struct expression *expr, int param, const char *key, const char *value);
1072 void add_untracked_param_hook(void (func)(struct expression *call, int param));
1073 void mark_all_params_untracked(int return_id, char *return_ranges, struct expression *expr);
1074
1075 /* smatch_strings.c */
1076 struct state_list *get_strings(struct expression *expr);
1077
1078 /* smatch_estate.c */
1079 int estate_get_single_value(struct smatch_state *state, sval_t *sval);
1080
1081 /* smatch_address.c */
1082 int get_address_rl(struct expression *expr, struct range_list **rl);
1083 int get_member_offset(struct symbol *type, const char *member_name);
1084 int get_member_offset_from_deref(struct expression *expr);
1085
1086 /* for now this is in smatch_used_parameter.c */
1087 void __get_state_hook(int owner, const char *name, struct symbol *sym);
1088
1089 /* smatch_buf_comparison.c */
1090 int db_var_is_array_limit(struct expression *array, const char *name, struct var_sym_list *vsl);
1091
1092 struct stree *get_all_return_states(void);
1093 struct stree_stack *get_all_return_strees(void);
1094 int on_atomic_dec_path(void);
1095 int was_inced(const char *name, struct symbol *sym);
1096
1097 /* smatch_constraints.c */
1098 char *get_constraint_str(struct expression *expr);
1099 struct constraint_list *get_constraints(struct expression *expr);
1100 char *unmet_constraint(struct expression *data, struct expression *offset);
1101 char *get_required_constraint(const char *data_str);
1102
1103 /* smatch_container_of.c */
1104 int get_param_from_container_of(struct expression *expr);
1105 int get_offset_from_container_of(struct expression *expr);
1106
1107 /* smatch_mtag.c */
1108 int get_toplevel_mtag(struct symbol *sym, mtag_t *tag);
1109 int get_mtag(struct expression *expr, mtag_t *tag);
1110 int get_mtag_offset(struct expression *expr);
1111 int create_mtag_alias(mtag_t tag, struct expression *expr, mtag_t *new);
1112 int expr_to_mtag_name_offset(struct expression *expr, mtag_t *tag, char **name, int *offset);
1113 void update_mtag_data(struct expression *expr);
1114
1115 /* smatch_mem_tracker.c */
1116 extern int option_mem;
1117 unsigned long get_max_memory(void);
1118
1119 /* check_is_nospec.c */
1120 bool is_nospec(struct expression *expr);
1121
1122 static inline int type_bits(struct symbol *type)
1123 {
1124         if (!type)
1125                 return 0;
1126         if (type->type == SYM_PTR)  /* Sparse doesn't set this for &pointers */
1127                 return bits_in_pointer;
1128         if (type->type == SYM_ARRAY)
1129                 return bits_in_pointer;
1130         if (!type->examined)
1131                 examine_symbol_type(type);
1132         return type->bit_size;
1133 }
1134
1135 static inline int type_unsigned(struct symbol *base_type)
1136 {
1137         if (!base_type)
1138                 return 0;
1139         if (base_type->ctype.modifiers & MOD_UNSIGNED)
1140                 return 1;
1141         return 0;
1142 }
1143
1144 static inline int type_positive_bits(struct symbol *type)
1145 {
1146         if (!type)
1147                 return 0;
1148         if (type->type == SYM_ARRAY)
1149                 return bits_in_pointer - 1;
1150         if (type_unsigned(type))
1151                 return type_bits(type);
1152         return type_bits(type) - 1;
1153 }
1154
1155 static inline int sval_positive_bits(sval_t sval)
1156 {
1157         return type_positive_bits(sval.type);
1158 }
1159
1160 /*
1161  * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
1162  */
1163 static inline int sval_cmp(sval_t one, sval_t two)
1164 {
1165         struct symbol *type;
1166
1167         type = one.type;
1168         if (sval_positive_bits(two) > sval_positive_bits(one))
1169                 type = two.type;
1170         if (type_bits(type) < 31)
1171                 type = &int_ctype;
1172
1173         one = sval_cast(type, one);
1174         two = sval_cast(type, two);
1175
1176         if (type_unsigned(type)) {
1177                 if (one.uvalue < two.uvalue)
1178                         return -1;
1179                 if (one.uvalue == two.uvalue)
1180                         return 0;
1181                 return 1;
1182         }
1183         /* fix me handle type promotion and unsigned values */
1184         if (one.value < two.value)
1185                 return -1;
1186         if (one.value == two.value)
1187                 return 0;
1188         return 1;
1189 }
1190
1191 #endif      /* !SMATCH_H_ */