smatch.h

   1 /*
   2  * sparse/smatch.h
   3  *
   4  * Copyright (C) 2006 Dan Carpenter.
   5  *
   6  *  Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #ifndef         SMATCH_H_
  11 # define        SMATCH_H_
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <limits.h>
  16 #include "lib.h"
  17 #include "allocate.h"
  18 #include "parse.h"
  19 #include "expression.h"
  20
  21 typedef struct {
  22         struct symbol *type;
  23         union {
  24                 long long value;
  25                 unsigned long long uvalue;
  26         };
  27 } sval_t;
  28
  29 struct smatch_state {
  30         const char *name;
  31         void *data;
  32 };
  33 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  34 extern struct smatch_state undefined;
  35 extern struct smatch_state merged;
  36 extern struct smatch_state true_state;
  37 extern struct smatch_state false_state;
  38 DECLARE_ALLOCATOR(smatch_state);
  39
  40 static inline void *INT_PTR(int i)
  41 {
  42         return (void *)(long)i;
  43 }
  44
  45 static inline int PTR_INT(void *p)
  46 {
  47         return (int)(long)p;
  48 }
  49
  50 struct sm_state {
  51         unsigned short owner;
  52         unsigned int merged:1;
  53         unsigned int implied:1;
  54         const char *name;
  55         struct symbol *sym;
  56         struct smatch_state *state;
  57         unsigned int line;
  58         struct state_list *pool;
  59         struct sm_state *left;
  60         struct sm_state *right;
  61         unsigned int nr_children;
  62         struct state_list *possible;
  63 };
  64
  65 struct tracker {
  66         int owner;
  67         char *name;
  68         struct symbol *sym;
  69 };
  70 DECLARE_ALLOCATOR(tracker);
  71 DECLARE_PTR_LIST(tracker_list, struct tracker);
  72
  73 enum hook_type {
  74         EXPR_HOOK,
  75         STMT_HOOK,
  76         SYM_HOOK,
  77         STRING_HOOK,
  78         DECLARATION_HOOK,
  79         ASSIGNMENT_HOOK,
  80         RAW_ASSIGNMENT_HOOK,
  81         GLOBAL_ASSIGNMENT_HOOK,
  82         LOGIC_HOOK,
  83         CONDITION_HOOK,
  84         PRELOOP_HOOK,
  85         SELECT_HOOK,
  86         WHOLE_CONDITION_HOOK,
  87         FUNCTION_CALL_HOOK,
  88         CALL_ASSIGNMENT_HOOK,
  89         MACRO_ASSIGNMENT_HOOK,
  90         BINOP_HOOK,
  91         OP_HOOK,
  92         DEREF_HOOK,
  93         CASE_HOOK,
  94         ASM_HOOK,
  95         CAST_HOOK,
  96         SIZEOF_HOOK,
  97         BASE_HOOK,
  98         FUNC_DEF_HOOK,
  99         END_FUNC_HOOK,
 100         RETURN_HOOK,
 101         END_FILE_HOOK,
 102 };
 103
 104 #define TRUE 1
 105 #define FALSE 0
 106
 107 struct range_list;
 108
 109 void add_hook(void *func, enum hook_type type);
 110 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 111 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 112 void add_merge_hook(int client_id, merge_func_t *func);
 113 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 114 typedef void (scope_hook)(void *data);
 115 void add_scope_hook(scope_hook *hook, void *data);
 116 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 117 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 118                                 struct expression *assign_expr, void *data);
 119 typedef void (return_implies_hook)(struct expression *call_expr,
 120                                    int param, char *key, char *value);
 121 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 122 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 123
 124 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 125                               void *info);
 126 void add_implied_return_hook(const char *look_for,
 127                              implied_return_hook *call_back,
 128                              void *info);
 129 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 130                               void *info);
 131 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 132                               void *info);
 133 void return_implies_state(const char *look_for, long long start, long long end,
 134                          implication_hook *call_back, void *info);
 135 void add_db_return_implies_callback(int type, return_implies_hook *callback);
 136 void add_db_return_states_callback(int type, return_implies_hook *callback);
 137 int get_implied_return(struct expression *expr, struct range_list **rl);
 138
 139 typedef void (modification_hook)(struct sm_state *sm);
 140 void add_modification_hook(int owner, modification_hook *call_back);
 141 void add_indirect_modification_hook(int owner, modification_hook *call_back);
 142
 143 const char *get_filename(void);
 144 char *get_function(void);
 145 int get_lineno(void);
 146 extern int final_pass;
 147 extern struct symbol *cur_func_sym;
 148 extern int option_debug;
 149 extern int local_debug;
 150
 151 extern FILE *sm_outfd;
 152 #define sm_printf(msg...) do { if (final_pass) fprintf(sm_outfd, msg); } while (0)
 153
 154 static inline void sm_prefix(void)
 155 {
 156         sm_printf("%s:%d %s() ", get_filename(), get_lineno(), get_function());
 157 }
 158
 159 static inline void print_implied_debug_msg();
 160
 161 #define sm_msg(msg...) \
 162 do {                                                           \
 163         print_implied_debug_msg();                             \
 164         if (!option_debug && !final_pass)                      \
 165                 break;                                         \
 166         sm_prefix();                                           \
 167         sm_printf(msg);                                        \
 168         sm_printf("\n");                                       \
 169 } while (0)
 170
 171 extern char *implied_debug_msg;
 172 static inline void print_implied_debug_msg()
 173 {
 174         static struct symbol *last_printed = NULL;
 175
 176         if (!implied_debug_msg)
 177                 return;
 178         if (last_printed == cur_func_sym)
 179                 return;
 180         last_printed = cur_func_sym;
 181         sm_msg("%s", implied_debug_msg);
 182 }
 183
 184 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 185
 186 #define sm_info(msg...) do {                                    \
 187         if (option_debug || (option_info && final_pass)) {      \
 188                 sm_prefix();                                    \
 189                 sm_printf("info: ");                            \
 190                 sm_printf(msg);                                 \
 191                 sm_printf("\n");                                \
 192         }                                                       \
 193 } while(0)
 194
 195 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 196 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 197 struct state_list *get_possible_states(int owner, const char *name,
 198                                        struct symbol *sym);
 199 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 200 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 201                struct smatch_state *state);
 202 struct sm_state *set_state_expr(int owner, struct expression *expr,
 203                 struct smatch_state *state);
 204 void delete_state(int owner, const char *name, struct symbol *sym);
 205 void delete_state_expr(int owner, struct expression *expr);
 206 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 207                            struct smatch_state *true_state,
 208                            struct smatch_state *false_state);
 209 void set_true_false_states_expr(int owner, struct expression *expr,
 210                            struct smatch_state *true_state,
 211                            struct smatch_state *false_state);
 212
 213 struct state_list *get_all_states_slist(int owner, struct state_list *source);
 214 struct state_list *get_all_states(int id);
 215 int is_reachable(void);
 216
 217 /* smatch_helper.c */
 218 char *alloc_string(const char *str);
 219 void free_string(char *str);
 220 struct smatch_state *alloc_state_num(int num);
 221 struct expression *get_argument_from_call_expr(struct expression_list *args,
 222                                                int num);
 223 char *get_variable_from_expr_complex(struct expression *expr,
 224                                      struct symbol **sym_ptr);
 225 char *get_variable_from_expr(struct expression *expr,
 226                              struct symbol **sym_ptr);
 227 int sym_name_is(const char *name, struct expression *expr);
 228 int get_value(struct expression *expr, sval_t *val);
 229 int get_implied_value(struct expression *expr, sval_t *val);
 230 int get_implied_min(struct expression *expr, sval_t *sval);
 231 int get_implied_max(struct expression *expr, sval_t *val);
 232 int get_hard_max(struct expression *expr, sval_t *sval);
 233 int get_fuzzy_min(struct expression *expr, sval_t *min);
 234 int get_fuzzy_max(struct expression *expr, sval_t *max);
 235 int get_absolute_min(struct expression *expr, sval_t *sval);
 236 int get_absolute_max(struct expression *expr, sval_t *sval);
 237 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 238 int is_zero(struct expression *expr);
 239 int known_condition_true(struct expression *expr);
 240 int known_condition_false(struct expression *expr);
 241 int implied_condition_true(struct expression *expr);
 242 int implied_condition_false(struct expression *expr);
 243
 244 int is_array(struct expression *expr);
 245 struct expression *get_array_name(struct expression *expr);
 246 struct expression *get_array_offset(struct expression *expr);
 247 const char *show_state(struct smatch_state *state);
 248 struct statement *get_expression_statement(struct expression *expr);
 249 struct expression *strip_parens(struct expression *expr);
 250 struct expression *strip_expr(struct expression *expr);
 251 void scoped_state(int my_id, const char *name, struct symbol *sym);
 252 int is_error_return(struct expression *expr);
 253 int getting_address(void);
 254 char *get_member_name(struct expression *expr);
 255 char *get_fnptr_name(struct expression *expr);
 256 int positions_eq(struct position pos1, struct position pos2);
 257 struct statement *get_current_statement(void);
 258 int get_param_num_from_sym(struct symbol *sym);
 259
 260 /* smatch_type.c */
 261 struct symbol *get_real_base_type(struct symbol *sym);
 262 int type_bits(struct symbol *type);
 263 int type_positive_bits(struct symbol *type);
 264 struct symbol *get_pointer_type(struct expression *expr);
 265 struct symbol *get_type(struct expression *expr);
 266 int type_unsigned(struct symbol *base_type);
 267 int type_signed(struct symbol *base_type);
 268 int expr_unsigned(struct expression *expr);
 269 int returns_unsigned(struct symbol *base_type);
 270 int is_pointer(struct expression *expr);
 271 int returns_pointer(struct symbol *base_type);
 272 sval_t sval_type_max(struct symbol *base_type);
 273 sval_t sval_type_min(struct symbol *base_type);
 274 int nr_bits(struct expression *expr);
 275 int is_static(struct expression *expr);
 276 int types_equiv(struct symbol *one, struct symbol *two);
 277 const char *global_static();
 278 struct symbol *cur_func_return_type(void);
 279 struct symbol *get_arg_type(struct expression *fn, int arg);
 280 struct symbol *get_member_type_from_key(struct symbol *sym, char *key);
 281
 282 /* smatch_ignore.c */
 283 void add_ignore(int owner, const char *name, struct symbol *sym);
 284 int is_ignored(int owner, const char *name, struct symbol *sym);
 285
 286 /* smatch_tracker */
 287 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 288 void add_tracker(struct tracker_list **list, int owner, const char *name,
 289                 struct symbol *sym);
 290 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 291 void del_tracker(struct tracker_list **list, int owner, const char *name,
 292                 struct symbol *sym);
 293 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 294                 struct symbol *sym);
 295 void free_tracker_list(struct tracker_list **list);
 296 void free_trackers_and_list(struct tracker_list **list);
 297
 298 /* smatch_conditions */
 299 int in_condition(void);
 300
 301 /* smatch_flow.c */
 302
 303 void smatch (int argc, char **argv);
 304 int inside_loop(void);
 305 int in_expression_statement(void);
 306 void __split_expr(struct expression *expr);
 307 void __split_stmt(struct statement *stmt);
 308 extern int option_assume_loops;
 309 extern int option_known_conditions;
 310 extern int option_two_passes;
 311 extern int option_no_db;
 312 extern int option_file_output;
 313 extern struct expression_list *big_expression_stack;
 314 extern struct statement_list *big_statement_stack;
 315 extern int __in_pre_condition;
 316 extern int __bail_on_rest_of_function;
 317
 318 /* smatch_conditions */
 319 void __split_whole_condition(struct expression *expr);
 320 void __handle_logic(struct expression *expr);
 321 int is_condition(struct expression *expr);
 322 int __handle_condition_assigns(struct expression *expr);
 323 int __handle_select_assigns(struct expression *expr);
 324 int __handle_expr_statement_assigns(struct expression *expr);
 325
 326 /* smatch_implied.c */
 327 extern int option_debug_implied;
 328 extern int option_debug_related;
 329 extern int option_no_implied;
 330 void get_implications(char *name, struct symbol *sym, int comparison, long long num,
 331                       struct state_list **true_states,
 332                       struct state_list **false_states);
 333 struct range_list_stack;
 334 struct state_list *__implied_case_slist(struct expression *switch_expr,
 335                                         struct expression *case_expr,
 336                                         struct range_list_stack **remaining_cases,
 337                                         struct state_list **raw_slist);
 338 struct range_list *__get_implied_values(struct expression *switch_expr);
 339 void overwrite_states_using_pool(struct sm_state *sm);
 340
 341 /* smatch_extras.c */
 342 #define SMATCH_EXTRA 1 /* this is my_id from smatch extra set in smatch.c */
 343
 344 struct data_range {
 345         sval_t min;
 346         sval_t max;
 347 };
 348
 349 static const long long valid_ptr_max = LONG_MAX;
 350 static const long long valid_ptr_min = 4096;
 351 static const sval_t valid_ptr_max_sval = {
 352         .type = &ptr_ctype,
 353         .value = LONG_MAX,
 354 };
 355 static const sval_t valid_ptr_min_sval = {
 356         .type = &ptr_ctype,
 357         .value = 4096,
 358 };
 359
 360 /* smatch_absolute.c */
 361 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 362 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 363
 364 /* smatch_states.c */
 365 void __push_fake_cur_slist();
 366 struct state_list *__pop_fake_cur_slist();
 367 void __merge_slist_into_cur(struct state_list *slist);
 368
 369 int unreachable(void);
 370 void __set_sm(struct sm_state *sm);
 371 struct state_list *__get_cur_slist(void);
 372 void __set_true_false_sm(struct sm_state *true_state,
 373                         struct sm_state *false_state);
 374 void nullify_path(void);
 375 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 376                                void *unused);
 377 void __unnullify_path(void);
 378 int __path_is_null(void);
 379 void clear_all_states(void);
 380
 381 struct sm_state *get_sm_state(int owner, const char *name,
 382                                 struct symbol *sym);
 383 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 384 void __push_true_states(void);
 385 void __use_false_states(void);
 386 void __discard_false_states(void);
 387 void __merge_false_states(void);
 388 void __merge_true_states(void);
 389
 390 void __negate_cond_stacks(void);
 391 void __use_pre_cond_states(void);
 392 void __use_cond_true_states(void);
 393 void __use_cond_false_states(void);
 394 void __push_cond_stacks(void);
 395 struct state_list *__copy_cond_true_states(void);
 396 struct state_list *__copy_cond_false_states(void);
 397 struct state_list *__pop_cond_true_stack(void);
 398 struct state_list *__pop_cond_false_stack(void);
 399 void __and_cond_states(void);
 400 void __or_cond_states(void);
 401 void __save_pre_cond_states(void);
 402 void __discard_pre_cond_states(void);
 403 void __use_cond_states(void);
 404 extern struct state_list *__last_base_slist;
 405
 406 void __warn_on_silly_pre_loops(void);
 407
 408 void __push_continues(void);
 409 void __discard_continues(void);
 410 void __process_continues(void);
 411 void __merge_continues(void);
 412
 413 void __push_breaks(void);
 414 void __process_breaks(void);
 415 int __has_breaks(void);
 416 void __merge_breaks(void);
 417 void __use_breaks(void);
 418
 419 void __save_switch_states(struct expression *switch_expr);
 420 void __discard_switches(void);
 421 void __merge_switches(struct expression *switch_expr, struct expression *case_expr);
 422 void __push_default(void);
 423 void __set_default(void);
 424 int __pop_default(void);
 425
 426 void __push_conditions(void);
 427 void __discard_conditions(void);
 428
 429 void __save_gotos(const char *name);
 430 void __merge_gotos(const char *name);
 431
 432 void __print_cur_slist(void);
 433
 434 /* smatch_hooks.c */
 435 void __pass_to_client(void *data, enum hook_type type);
 436 void __pass_to_client_no_data(enum hook_type type);
 437 void __pass_case_to_client(struct expression *switch_expr,
 438                            struct expression *case_expr);
 439 int __has_merge_function(int client_id);
 440 struct smatch_state *__client_merge_function(int owner,
 441                                              struct smatch_state *s1,
 442                                              struct smatch_state *s2);
 443 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 444 void __push_scope_hooks(void);
 445 void __call_scope_hooks(void);
 446
 447 /* smatch_function_hooks.c */
 448 void create_function_hook_hash(void);
 449 void __match_initializer_call(struct symbol *sym);
 450
 451 /* smatch_db.c */
 452 enum info_type {
 453         INTERNAL = 0,
 454         PARAM_VALUE,
 455         BUF_SIZE,
 456         USER_DATA,
 457         CAPPED_DATA,
 458         RETURN_VALUE,
 459         DEREFERENCE,
 460         RANGE_CAP,
 461         LOCK_HELD,
 462         LOCK_RELEASED,
 463         ABSOLUTE_LIMITS,
 464         LIMITED_VALUE,
 465 };
 466
 467 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 468 void add_member_info_callback(int owner, void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state));
 469 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist));
 470 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state));
 471 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value));
 472 struct range_list *db_return_vals(struct expression *expr);
 473
 474 #define run_sql(call_back, sql...)    \
 475 do {                                  \
 476         char sql_txt[1024];           \
 477         snprintf(sql_txt, 1024, sql); \
 478         sm_debug("%s\n", sql_txt);    \
 479         sql_exec(call_back, sql_txt); \
 480 } while (0)
 481
 482 void sql_exec(int (*callback)(void*, int, char**, char**), const char *sql);
 483 void open_smatch_db(void);
 484
 485 /* smatch_files.c */
 486 struct token *get_tokens_file(const char *filename);
 487
 488 /* smatch.c */
 489 extern char *option_project_str;
 490 extern char *data_dir;
 491 extern int option_no_data;
 492 extern int option_spammy;
 493 extern int option_full_path;
 494 extern int option_param_mapper;
 495 extern int option_info;
 496 extern int option_call_tree;
 497 extern int num_checks;
 498
 499 enum project_type {
 500         PROJ_NONE,
 501         PROJ_KERNEL,
 502         PROJ_WINE,
 503 };
 504 extern enum project_type option_project;
 505 const char *check_name(unsigned short id);
 506
 507
 508 /* smatch_buf_size.c */
 509 int get_array_size(struct expression *expr);
 510 int get_array_size_bytes(struct expression *expr);
 511 int get_array_size_bytes_min(struct expression *expr);
 512
 513 /* smatch_capped.c */
 514 int is_capped(struct expression *expr);
 515
 516 /* check_user_data.c */
 517 int is_user_data(struct expression *expr);
 518
 519 /* check_locking.c */
 520 void print_held_locks();
 521
 522 /* check_assigned_expr.c */
 523 struct expression *get_assigned_expr(struct expression *expr);
 524
 525 /* smatch_sval.c */
 526 sval_t *sval_alloc(sval_t sval);
 527 sval_t *sval_alloc_permanent(sval_t sval);
 528 sval_t sval_blank(struct expression *expr);
 529 sval_t sval_type_val(struct symbol *type, long long val);
 530 sval_t sval_from_val(struct expression *expr, long long val);
 531 int sval_unsigned(sval_t sval);
 532 int sval_signed(sval_t sval);
 533 int sval_bits(sval_t sval);
 534 int sval_positive_bits(sval_t sval);
 535 int sval_bits_used(sval_t sval);
 536 int sval_is_negative(sval_t sval);
 537 int sval_is_positive(sval_t sval);
 538 int sval_is_min(sval_t sval);
 539 int sval_is_max(sval_t sval);
 540 int sval_is_a_min(sval_t sval);
 541 int sval_is_a_max(sval_t sval);
 542 int sval_cmp(sval_t one, sval_t two);
 543 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
 544 int sval_cmp_val(sval_t one, long long val);
 545 int sval_too_low(struct symbol *type, sval_t sval);
 546 int sval_too_high(struct symbol *type, sval_t sval);
 547 int sval_fits(struct symbol *type, sval_t sval);
 548 sval_t sval_cast(struct symbol *type, sval_t sval);
 549 sval_t sval_preop(sval_t sval, int op);
 550 sval_t sval_binop(sval_t left, int op, sval_t right);
 551 int sval_binop_overflows(sval_t left, int op, sval_t right);
 552 const char *sval_to_str(sval_t sval);
 553 const char *sval_to_numstr(sval_t sval);
 554 sval_t ll_to_sval(long long val);
 555
 556 #endif      /* !SMATCH_H_ */