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