smatch.h

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