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 struct smatch_state {
  41         const char *name;
  42         void *data;
  43 };
  44 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  45 extern struct smatch_state undefined;
  46 extern struct smatch_state ghost;
  47 extern struct smatch_state merged;
  48 extern struct smatch_state true_state;
  49 extern struct smatch_state false_state;
  50 DECLARE_ALLOCATOR(smatch_state);
  51
  52 static inline void *INT_PTR(int i)
  53 {
  54         return (void *)(long)i;
  55 }
  56
  57 static inline int PTR_INT(void *p)
  58 {
  59         return (int)(long)p;
  60 }
  61
  62 struct tracker {
  63         char *name;
  64         struct symbol *sym;
  65         unsigned short owner;
  66 };
  67 DECLARE_ALLOCATOR(tracker);
  68 DECLARE_PTR_LIST(tracker_list, struct tracker);
  69 DECLARE_PTR_LIST(stree_stack, struct stree);
  70
  71 /* The first 3 struct members must match struct tracker */
  72 struct sm_state {
  73         const char *name;
  74         struct symbol *sym;
  75         unsigned short owner;
  76         unsigned short merged:1;
  77         unsigned int nr_children;
  78         unsigned int line;
  79         struct smatch_state *state;
  80         struct stree *pool;
  81         struct sm_state *left;
  82         struct sm_state *right;
  83         struct state_list *possible;
  84 };
  85
  86 struct var_sym {
  87         char *var;
  88         struct symbol *sym;
  89 };
  90 DECLARE_ALLOCATOR(var_sym);
  91 DECLARE_PTR_LIST(var_sym_list, struct var_sym);
  92
  93 struct constraint {
  94         int op;
  95         int id;
  96 };
  97 DECLARE_PTR_LIST(constraint_list, struct constraint);
  98
  99 enum hook_type {
 100         EXPR_HOOK,
 101         STMT_HOOK,
 102         STMT_HOOK_AFTER,
 103         SYM_HOOK,
 104         STRING_HOOK,
 105         DECLARATION_HOOK,
 106         ASSIGNMENT_HOOK,
 107         ASSIGNMENT_HOOK_AFTER,
 108         RAW_ASSIGNMENT_HOOK,
 109         GLOBAL_ASSIGNMENT_HOOK,
 110         LOGIC_HOOK,
 111         CONDITION_HOOK,
 112         PRELOOP_HOOK,
 113         SELECT_HOOK,
 114         WHOLE_CONDITION_HOOK,
 115         FUNCTION_CALL_HOOK,
 116         CALL_HOOK_AFTER_INLINE,
 117         FUNCTION_CALL_HOOK_AFTER_DB,
 118         CALL_ASSIGNMENT_HOOK,
 119         MACRO_ASSIGNMENT_HOOK,
 120         BINOP_HOOK,
 121         OP_HOOK,
 122         DEREF_HOOK,
 123         CASE_HOOK,
 124         ASM_HOOK,
 125         CAST_HOOK,
 126         SIZEOF_HOOK,
 127         BASE_HOOK,
 128         FUNC_DEF_HOOK,
 129         AFTER_DEF_HOOK,
 130         END_FUNC_HOOK,
 131         AFTER_FUNC_HOOK,
 132         RETURN_HOOK,
 133         INLINE_FN_START,
 134         INLINE_FN_END,
 135         END_FILE_HOOK,
 136         NUM_HOOKS,
 137 };
 138
 139 #define TRUE 1
 140 #define FALSE 0
 141
 142 struct range_list;
 143
 144 void add_hook(void *func, enum hook_type type);
 145 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 146 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 147 void add_merge_hook(int client_id, merge_func_t *func);
 148 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 149 void add_pre_merge_hook(int client_id, void (*hook)(struct sm_state *sm));
 150 typedef void (scope_hook)(void *data);
 151 void add_scope_hook(scope_hook *hook, void *data);
 152 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 153 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 154                                 struct expression *assign_expr, void *data);
 155 typedef void (return_implies_hook)(struct expression *call_expr,
 156                                    int param, char *key, char *value);
 157 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 158 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 159
 160 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 161                               void *info);
 162 void add_implied_return_hook(const char *look_for,
 163                              implied_return_hook *call_back,
 164                              void *info);
 165 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 166                               void *info);
 167 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 168                               void *info);
 169 void return_implies_state(const char *look_for, long long start, long long end,
 170                          implication_hook *call_back, void *info);
 171 void select_return_states_hook(int type, return_implies_hook *callback);
 172 void select_return_states_before(void (*fn)(void));
 173 void select_return_states_after(void (*fn)(void));
 174 int get_implied_return(struct expression *expr, struct range_list **rl);
 175 void allocate_hook_memory(void);
 176
 177 struct modification_data {
 178         struct smatch_state *prev;
 179         struct expression *cur;
 180 };
 181
 182 typedef void (modification_hook)(struct sm_state *sm, struct expression *mod_expr);
 183 void add_modification_hook(int owner, modification_hook *call_back);
 184 void add_modification_hook_late(int owner, modification_hook *call_back);
 185 struct smatch_state *get_modification_state(struct expression *expr);
 186
 187 int outside_of_function(void);
 188 const char *get_filename(void);
 189 const char *get_base_file(void);
 190 char *get_function(void);
 191 int get_lineno(void);
 192 extern int final_pass;
 193 extern struct symbol *cur_func_sym;
 194 extern int option_debug;
 195 extern int local_debug;
 196 extern int option_info;
 197 extern int option_spammy;
 198 extern char *trace_variable;
 199 extern struct stree *global_states;
 200 int is_silenced_function(void);
 201
 202 /* smatch_impossible.c */
 203 int is_impossible_path(void);
 204 void set_path_impossible(void);
 205
 206 extern FILE *sm_outfd;
 207 extern FILE *sql_outfd;
 208 extern FILE *caller_info_fd;
 209 #define sm_printf(msg...) do { if (final_pass || option_debug || local_debug) fprintf(sm_outfd, msg); } while (0)
 210
 211 static inline void sm_prefix(void)
 212 {
 213         sm_printf("%s:%d %s() ", get_filename(), get_lineno(), get_function());
 214 }
 215
 216 static inline void print_implied_debug_msg();
 217
 218 #define sm_msg(msg...) \
 219 do {                                                           \
 220         print_implied_debug_msg();                             \
 221         if (!option_debug && !final_pass && !local_debug)      \
 222                 break;                                         \
 223         if (!option_info && is_silenced_function())            \
 224                 break;                                         \
 225         sm_prefix();                                           \
 226         sm_printf(msg);                                        \
 227         sm_printf("\n");                                       \
 228 } while (0)
 229
 230 #define local_debug(msg...)                                     \
 231 do {                                                            \
 232         if (local_debug)                                        \
 233                 sm_msg(msg);                                    \
 234 } while (0)
 235
 236 extern char *implied_debug_msg;
 237 static inline void print_implied_debug_msg(void)
 238 {
 239         static struct symbol *last_printed = NULL;
 240
 241         if (!implied_debug_msg)
 242                 return;
 243         if (last_printed == cur_func_sym)
 244                 return;
 245         last_printed = cur_func_sym;
 246         sm_msg("%s", implied_debug_msg);
 247 }
 248
 249 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 250
 251 #define sm_info(msg...) do {                                    \
 252         if (option_debug || (option_info && final_pass)) {      \
 253                 sm_prefix();                                    \
 254                 sm_printf("info: ");                            \
 255                 sm_printf(msg);                                 \
 256                 sm_printf("\n");                                \
 257         }                                                       \
 258 } while(0)
 259
 260 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
 261
 262 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 263 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 264 struct state_list *get_possible_states(int owner, const char *name,
 265                                        struct symbol *sym);
 266 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 267 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 268                struct smatch_state *state);
 269 struct sm_state *set_state_expr(int owner, struct expression *expr,
 270                 struct smatch_state *state);
 271 void delete_state(int owner, const char *name, struct symbol *sym);
 272 void delete_state_expr(int owner, struct expression *expr);
 273 void __delete_all_states_sym(struct symbol *sym);
 274 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 275                            struct smatch_state *true_state,
 276                            struct smatch_state *false_state);
 277 void set_true_false_states_expr(int owner, struct expression *expr,
 278                            struct smatch_state *true_state,
 279                            struct smatch_state *false_state);
 280
 281 struct stree *get_all_states_from_stree(int owner, struct stree *source);
 282 struct stree *get_all_states_stree(int id);
 283 struct stree *__get_cur_stree(void);
 284 int is_reachable(void);
 285
 286 /* smatch_helper.c */
 287 DECLARE_PTR_LIST(int_stack, int);
 288 char *alloc_string(const char *str);
 289 void free_string(char *str);
 290 void append(char *dest, const char *data, int buff_len);
 291 void remove_parens(char *str);
 292 struct smatch_state *alloc_state_num(int num);
 293 struct smatch_state *alloc_state_str(const char *name);
 294 struct smatch_state *alloc_state_expr(struct expression *expr);
 295 struct expression *get_argument_from_call_expr(struct expression_list *args,
 296                                                int num);
 297
 298 char *expr_to_var(struct expression *expr);
 299 struct symbol *expr_to_sym(struct expression *expr);
 300 char *expr_to_str(struct expression *expr);
 301 char *expr_to_str_sym(struct expression *expr,
 302                                      struct symbol **sym_ptr);
 303 char *expr_to_var_sym(struct expression *expr,
 304                              struct symbol **sym_ptr);
 305 char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
 306 char *expr_to_chunk_sym_vsl(struct expression *expr, struct symbol **sym, struct var_sym_list **vsl);
 307 int get_complication_score(struct expression *expr);
 308
 309 int sym_name_is(const char *name, struct expression *expr);
 310 int get_const_value(struct expression *expr, sval_t *sval);
 311 int get_value(struct expression *expr, sval_t *val);
 312 int get_implied_value(struct expression *expr, sval_t *val);
 313 int get_implied_min(struct expression *expr, sval_t *sval);
 314 int get_implied_max(struct expression *expr, sval_t *val);
 315 int get_hard_max(struct expression *expr, sval_t *sval);
 316 int get_fuzzy_min(struct expression *expr, sval_t *min);
 317 int get_fuzzy_max(struct expression *expr, sval_t *max);
 318 int get_absolute_min(struct expression *expr, sval_t *sval);
 319 int get_absolute_max(struct expression *expr, sval_t *sval);
 320 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 321 int parse_call_math_rl(struct expression *call, char *math, struct range_list **rl);
 322 char *get_value_in_terms_of_parameter_math(struct expression *expr);
 323 char *get_value_in_terms_of_parameter_math_var_sym(const char *var, struct symbol *sym);
 324 int is_zero(struct expression *expr);
 325 int known_condition_true(struct expression *expr);
 326 int known_condition_false(struct expression *expr);
 327 int implied_condition_true(struct expression *expr);
 328 int implied_condition_false(struct expression *expr);
 329 int can_integer_overflow(struct symbol *type, struct expression *expr);
 330
 331 int is_array(struct expression *expr);
 332 struct expression *get_array_base(struct expression *expr);
 333 struct expression *get_array_offset(struct expression *expr);
 334 const char *show_state(struct smatch_state *state);
 335 struct statement *get_expression_statement(struct expression *expr);
 336 struct expression *strip_parens(struct expression *expr);
 337 struct expression *strip_expr(struct expression *expr);
 338 void scoped_state(int my_id, const char *name, struct symbol *sym);
 339 int is_error_return(struct expression *expr);
 340 int getting_address(void);
 341 int get_struct_and_member(struct expression *expr, const char **type, const char **member);
 342 char *get_member_name(struct expression *expr);
 343 char *get_fnptr_name(struct expression *expr);
 344 int cmp_pos(struct position pos1, struct position pos2);
 345 int positions_eq(struct position pos1, struct position pos2);
 346 struct statement *get_current_statement(void);
 347 struct statement *get_prev_statement(void);
 348 int get_param_num_from_sym(struct symbol *sym);
 349 int get_param_num(struct expression *expr);
 350 int ms_since(struct timeval *start);
 351 int parent_is_gone_var_sym(const char *name, struct symbol *sym);
 352 int parent_is_gone(struct expression *expr);
 353 int invert_op(int op);
 354 int expr_equiv(struct expression *one, struct expression *two);
 355 void push_int(struct int_stack **stack, int num);
 356 int pop_int(struct int_stack **stack);
 357
 358 /* smatch_type.c */
 359 struct symbol *get_real_base_type(struct symbol *sym);
 360 int type_bytes(struct symbol *type);
 361 int array_bytes(struct symbol *type);
 362 struct symbol *get_pointer_type(struct expression *expr);
 363 struct symbol *get_type(struct expression *expr);
 364 int type_signed(struct symbol *base_type);
 365 int expr_unsigned(struct expression *expr);
 366 int expr_signed(struct expression *expr);
 367 int returns_unsigned(struct symbol *base_type);
 368 int is_pointer(struct expression *expr);
 369 int returns_pointer(struct symbol *base_type);
 370 sval_t sval_type_max(struct symbol *base_type);
 371 sval_t sval_type_min(struct symbol *base_type);
 372 int nr_bits(struct expression *expr);
 373 int is_void_pointer(struct expression *expr);
 374 int is_char_pointer(struct expression *expr);
 375 int is_string(struct expression *expr);
 376 int is_static(struct expression *expr);
 377 int is_local_variable(struct expression *expr);
 378 int types_equiv(struct symbol *one, struct symbol *two);
 379 int fn_static(void);
 380 const char *global_static();
 381 struct symbol *cur_func_return_type(void);
 382 struct symbol *get_arg_type(struct expression *fn, int arg);
 383 struct symbol *get_member_type_from_key(struct expression *expr, char *key);
 384 int is_struct(struct expression *expr);
 385 char *type_to_str(struct symbol *type);
 386
 387 /* smatch_ignore.c */
 388 void add_ignore(int owner, const char *name, struct symbol *sym);
 389 int is_ignored(int owner, const char *name, struct symbol *sym);
 390
 391 /* smatch_var_sym */
 392 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym);
 393 struct var_sym_list *expr_to_vsl(struct expression *expr);
 394 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 395 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr);
 396 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 397 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym);
 398 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl);
 399 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src);
 400 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two);
 401 int var_sym_lists_equiv(struct var_sym_list *one, struct var_sym_list *two);
 402 void free_var_sym_list(struct var_sym_list **list);
 403 void free_var_syms_and_list(struct var_sym_list **list);
 404
 405 /* smatch_tracker */
 406 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 407 void add_tracker(struct tracker_list **list, int owner, const char *name,
 408                 struct symbol *sym);
 409 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 410 void del_tracker(struct tracker_list **list, int owner, const char *name,
 411                 struct symbol *sym);
 412 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 413                 struct symbol *sym);
 414 void free_tracker_list(struct tracker_list **list);
 415 void free_trackers_and_list(struct tracker_list **list);
 416
 417 /* smatch_conditions */
 418 int in_condition(void);
 419
 420 /* smatch_flow.c */
 421
 422 extern int __in_fake_assign;
 423 void smatch (int argc, char **argv);
 424 int inside_loop(void);
 425 int definitely_inside_loop(void);
 426 struct expression *get_switch_expr(void);
 427 int in_expression_statement(void);
 428 void __process_post_op_stack(void);
 429 void __split_expr(struct expression *expr);
 430 void __split_label_stmt(struct statement *stmt);
 431 void __split_stmt(struct statement *stmt);
 432 extern int __in_function_def;
 433 extern int option_assume_loops;
 434 extern int option_two_passes;
 435 extern int option_no_db;
 436 extern int option_file_output;
 437 extern int option_time;
 438 extern struct expression_list *big_expression_stack;
 439 extern struct expression_list *big_condition_stack;
 440 extern struct statement_list *big_statement_stack;
 441 int is_assigned_call(struct expression *expr);
 442 int inlinable(struct expression *expr);
 443 extern int __inline_call;
 444 extern struct expression *__inline_fn;
 445 extern int __in_pre_condition;
 446 extern int __bail_on_rest_of_function;
 447 extern struct statement *__prev_stmt;
 448 extern struct statement *__cur_stmt;
 449 extern struct statement *__next_stmt;
 450 void init_fake_env(void);
 451 void end_fake_env(void);
 452
 453 /* smatch_struct_assignment.c */
 454 struct expression *get_faked_expression(void);
 455 void __fake_struct_member_assignments(struct expression *expr);
 456
 457 /* smatch_project.c */
 458 int is_no_inline_function(const char *function);
 459
 460 /* smatch_conditions */
 461 void __split_whole_condition(struct expression *expr);
 462 void __handle_logic(struct expression *expr);
 463 int is_condition(struct expression *expr);
 464 int __handle_condition_assigns(struct expression *expr);
 465 int __handle_select_assigns(struct expression *expr);
 466 int __handle_expr_statement_assigns(struct expression *expr);
 467
 468 /* smatch_implied.c */
 469 extern int option_debug_implied;
 470 extern int option_debug_related;
 471 struct range_list_stack;
 472 void param_limit_implications(struct expression *expr, int param, char *key, char *value);
 473 struct stree *__implied_case_stree(struct expression *switch_expr,
 474                                    struct range_list *case_rl,
 475                                    struct range_list_stack **remaining_cases,
 476                                    struct stree **raw_stree);
 477 void overwrite_states_using_pool(struct sm_state *gate_sm, struct sm_state *pool_sm);
 478 int assume(struct expression *expr);
 479 void end_assume(void);
 480
 481 /* smatch_extras.c */
 482 #define SMATCH_EXTRA 3 /* this is my_id from smatch extra set in smatch.c */
 483 extern int RETURN_ID;
 484
 485 struct data_range {
 486         sval_t min;
 487         sval_t max;
 488 };
 489
 490 extern long long valid_ptr_min, valid_ptr_max;
 491 extern sval_t valid_ptr_min_sval, valid_ptr_max_sval;
 492 static const sval_t array_min_sval = {
 493         .type = &ptr_ctype,
 494         {.value = 100000},
 495 };
 496 static const sval_t array_max_sval = {
 497         .type = &ptr_ctype,
 498         {.value = 199999},
 499 };
 500 static const sval_t text_seg_min = {
 501         .type = &ptr_ctype,
 502         {.value = 100000000},
 503 };
 504 static const sval_t text_seg_max = {
 505         .type = &ptr_ctype,
 506         {.value = 177777777},
 507 };
 508 static const sval_t data_seg_min = {
 509         .type = &ptr_ctype,
 510         {.value = 200000000},
 511 };
 512 static const sval_t data_seg_max = {
 513         .type = &ptr_ctype,
 514         {.value = 277777777},
 515 };
 516 static const sval_t bss_seg_min = {
 517         .type = &ptr_ctype,
 518         {.value = 300000000},
 519 };
 520 static const sval_t bss_seg_max = {
 521         .type = &ptr_ctype,
 522         {.value = 377777777},
 523 };
 524 static const sval_t stack_seg_min = {
 525         .type = &ptr_ctype,
 526         {.value = 400000000},
 527 };
 528 static const sval_t stack_seg_max = {
 529         .type = &ptr_ctype,
 530         {.value = 477777777},
 531 };
 532 static const sval_t kmalloc_seg_min = {
 533         .type = &ptr_ctype,
 534         {.value = 500000000},
 535 };
 536 static const sval_t kmalloc_seg_max = {
 537         .type = &ptr_ctype,
 538         {.value = 577777777},
 539 };
 540 static const sval_t vmalloc_seg_min = {
 541         .type = &ptr_ctype,
 542         {.value = 600000000},
 543 };
 544 static const sval_t vmalloc_seg_max = {
 545         .type = &ptr_ctype,
 546         {.value = 677777777},
 547 };
 548 static const sval_t fn_ptr_min = {
 549         .type = &ptr_ctype,
 550         {.value = 700000000},
 551 };
 552 static const sval_t fn_ptr_max = {
 553         .type = &ptr_ctype,
 554         {.value = 777777777},
 555 };
 556
 557 char *get_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 558 char *map_call_to_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 559 char *map_long_to_short_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 560 char *map_long_to_short_name_sym_nostack(const char *name, struct symbol *sym, struct symbol **new_sym);
 561
 562 #define STRLEN_MAX_RET 1010101
 563
 564 /* smatch_absolute.c */
 565 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 566 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 567
 568 /* smatch_local_values.c */
 569 int get_local_rl(struct expression *expr, struct range_list **rl);
 570 int get_local_max_helper(struct expression *expr, sval_t *sval);
 571 int get_local_min_helper(struct expression *expr, sval_t *sval);
 572
 573 /* smatch_type_value.c */
 574 int get_db_type_rl(struct expression *expr, struct range_list **rl);
 575 /* smatch_data_val.c */
 576 int get_db_data_rl(struct expression *expr, struct range_list **rl);
 577
 578 /* smatch_states.c */
 579 void __swap_cur_stree(struct stree *stree);
 580 void __push_fake_cur_stree();
 581 struct stree *__pop_fake_cur_stree();
 582 void __free_fake_cur_stree();
 583 void __set_fake_cur_stree_fast(struct stree *stree);
 584 void __pop_fake_cur_stree_fast(void);
 585 void __merge_stree_into_cur(struct stree *stree);
 586
 587 int unreachable(void);
 588 void __set_sm(struct sm_state *sm);
 589 void __set_sm_cur_stree(struct sm_state *sm);
 590 void __set_sm_fake_stree(struct sm_state *sm);
 591 void __set_true_false_sm(struct sm_state *true_state,
 592                         struct sm_state *false_state);
 593 void nullify_path(void);
 594 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 595                                void *unused);
 596 void __unnullify_path(void);
 597 int __path_is_null(void);
 598 void save_all_states(void);
 599 void restore_all_states(void);
 600 void free_goto_stack(void);
 601 void clear_all_states(void);
 602
 603 struct sm_state *get_sm_state(int owner, const char *name,
 604                                 struct symbol *sym);
 605 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 606 void __push_true_states(void);
 607 void __use_false_states(void);
 608 void __discard_false_states(void);
 609 void __merge_false_states(void);
 610 void __merge_true_states(void);
 611
 612 void __negate_cond_stacks(void);
 613 void __use_pre_cond_states(void);
 614 void __use_cond_true_states(void);
 615 void __use_cond_false_states(void);
 616 void __push_cond_stacks(void);
 617 void __fold_in_set_states(void);
 618 void __free_set_states(void);
 619 struct stree *__copy_cond_true_states(void);
 620 struct stree *__copy_cond_false_states(void);
 621 struct stree *__pop_cond_true_stack(void);
 622 struct stree *__pop_cond_false_stack(void);
 623 void __and_cond_states(void);
 624 void __or_cond_states(void);
 625 void __save_pre_cond_states(void);
 626 void __discard_pre_cond_states(void);
 627 struct stree *__get_true_states(void);
 628 struct stree *__get_false_states(void);
 629 void __use_cond_states(void);
 630 extern struct state_list *__last_base_slist;
 631
 632 void __push_continues(void);
 633 void __discard_continues(void);
 634 void __process_continues(void);
 635 void __merge_continues(void);
 636
 637 void __push_breaks(void);
 638 void __process_breaks(void);
 639 int __has_breaks(void);
 640 void __merge_breaks(void);
 641 void __use_breaks(void);
 642
 643 void __save_switch_states(struct expression *switch_expr);
 644 void __discard_switches(void);
 645 void __merge_switches(struct expression *switch_expr, struct range_list *case_rl);
 646 void __push_default(void);
 647 void __set_default(void);
 648 int __pop_default(void);
 649
 650 void __push_conditions(void);
 651 void __discard_conditions(void);
 652
 653 void __save_gotos(const char *name, struct symbol *sym);
 654 void __merge_gotos(const char *name, struct symbol *sym);
 655
 656 void __print_cur_stree(void);
 657
 658 /* smatch_hooks.c */
 659 void __pass_to_client(void *data, enum hook_type type);
 660 void __pass_to_client_no_data(enum hook_type type);
 661 void __pass_case_to_client(struct expression *switch_expr,
 662                            struct range_list *rl);
 663 int __has_merge_function(int client_id);
 664 struct smatch_state *__client_merge_function(int owner,
 665                                              struct smatch_state *s1,
 666                                              struct smatch_state *s2);
 667 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 668 void call_pre_merge_hook(struct sm_state *sm);
 669 void __push_scope_hooks(void);
 670 void __call_scope_hooks(void);
 671
 672 /* smatch_function_hooks.c */
 673 void create_function_hook_hash(void);
 674 void __match_initializer_call(struct symbol *sym);
 675
 676 /* smatch_db.c */
 677 enum info_type {
 678         INTERNAL        = 0,
 679         /*
 680          * Changing these numbers is a pain.  Don't do it.  If you ever use a
 681          * number it can't be re-used right away so there may be gaps.
 682          * We select these in order by type so if the order matters, then give
 683          * it a number below 100-999,9000-9999 ranges. */
 684
 685         PARAM_CLEARED   = 101,
 686         PARAM_LIMIT     = 103,
 687         PARAM_FILTER    = 104,
 688
 689         PARAM_VALUE     = 1001,
 690         BUF_SIZE        = 1002,
 691         USER_DATA       = 1003,
 692         CAPPED_DATA     = 1004,
 693         RETURN_VALUE    = 1005,
 694         DEREFERENCE     = 1006,
 695         RANGE_CAP       = 1007,
 696         LOCK_HELD       = 1008,
 697         LOCK_RELEASED   = 1009,
 698         ABSOLUTE_LIMITS = 1010,
 699         PARAM_ADD       = 1012,
 700         PARAM_FREED     = 1013,
 701         DATA_SOURCE     = 1014,
 702         FUZZY_MAX       = 1015,
 703         STR_LEN         = 1016,
 704         ARRAY_LEN       = 1017,
 705         CAPABLE         = 1018,
 706         NS_CAPABLE      = 1019,
 707         CONTAINER       = 1020,
 708         CASTED_CALL     = 1021,
 709         TYPE_LINK       = 1022,
 710         UNTRACKED_PARAM = 1023,
 711         CULL_PATH       = 1024,
 712         PARAM_SET       = 1025,
 713         PARAM_USED      = 1026,
 714         BYTE_UNITS      = 1027,
 715         COMPARE_LIMIT   = 1028,
 716         PARAM_COMPARE   = 1029,
 717         CONSTRAINT      = 1031,
 718         PASSES_TYPE     = 1032,
 719         CONSTRAINT_REQUIRED = 1033,
 720
 721         /* put random temporary stuff in the 7000-7999 range for testing */
 722         USER_DATA3      = 8017,
 723         USER_DATA3_SET  = 9017,
 724         NO_OVERFLOW     = 8018,
 725         NO_OVERFLOW_SIMPLE = 8019,
 726         LOCKED          = 8020,
 727         UNLOCKED        = 8021,
 728         SET_FS          = 8022,
 729         ATOMIC_INC      = 8023,
 730         ATOMIC_DEC      = 8024,
 731         NO_SIDE_EFFECT  = 8025,
 732         FN_ARG_LINK     = 8028,
 733         DATA_VALUE      = 8029,
 734         ARRAYSIZE_ARG   = 8033,
 735         SIZEOF_ARG      = 8034,
 736 };
 737
 738 void debug_sql(const char *sql);
 739 void debug_mem_sql(const char *sql);
 740 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 741 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm));
 742 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr));
 743 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));
 744 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value));
 745 struct range_list *db_return_vals(struct expression *expr);
 746 struct range_list *db_return_vals_from_str(const char *fn_name);
 747 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym);
 748 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl);
 749 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym);
 750 const char *state_name_to_param_name(const char *state_name, const char *param_name);
 751 const char *get_param_name_var_sym(const char *name, struct symbol *sym);
 752 const char *get_param_name(struct sm_state *sm);
 753 char *get_data_info_name(struct expression *expr);
 754
 755 #define run_sql(call_back, data, sql...)    \
 756 do {                                  \
 757         char sql_txt[1024];           \
 758         if (option_no_db)             \
 759                 break;                \
 760         snprintf(sql_txt, 1024, sql); \
 761         debug_sql(sql_txt);           \
 762         sql_exec(call_back, data, sql_txt); \
 763 } while (0)
 764
 765 /* like run_sql() but for the in-memory database */
 766 #define mem_sql(call_back, data, sql...)                                                \
 767 do {                                                                            \
 768         char sql_txt[1024];                                                     \
 769                                                                                 \
 770         snprintf(sql_txt, sizeof(sql_txt), sql);                                \
 771         sm_debug("in-mem: %s\n", sql_txt);                                      \
 772         debug_mem_sql(sql_txt);                                                 \
 773         sql_mem_exec(call_back, data, sql_txt);                                 \
 774 } while (0)
 775
 776 char *get_static_filter(struct symbol *sym);
 777
 778 void sql_insert_return_states(int return_id, const char *return_ranges,
 779                 int type, int param, const char *key, const char *value);
 780 void sql_insert_caller_info(struct expression *call, int type, int param,
 781                 const char *key, const char *value);
 782 void sql_insert_function_ptr(const char *fn, const char *struct_name);
 783 void sql_insert_return_values(const char *return_values);
 784 void sql_insert_call_implies(int type, int param, const char *key, const char *value);
 785 void sql_insert_function_type_size(const char *member, const char *ranges);
 786 void sql_insert_local_values(const char *name, const char *value);
 787 void sql_insert_function_type_value(const char *type, const char *value);
 788 void sql_insert_function_type(int param, const char *value);
 789 void sql_insert_parameter_name(int param, const char *value);
 790 void sql_insert_data_info(struct expression *data, int type, const char *value);
 791 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value);
 792 void sql_save_constraint(const char *con);
 793 void sql_save_constraint_required(const char *data, int op, const char *limit);
 794 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data);
 795 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value);
 796
 797 void sql_select_return_states(const char *cols, struct expression *call,
 798         int (*callback)(void*, int, char**, char**), void *info);
 799 void sql_select_call_implies(const char *cols, struct expression *call,
 800         int (*callback)(void*, int, char**, char**));
 801
 802 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 803 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 804
 805 void open_smatch_db(void);
 806
 807 /* smatch_files.c */
 808 int open_data_file(const char *filename);
 809 struct token *get_tokens_file(const char *filename);
 810
 811 /* smatch.c */
 812 extern char *option_debug_check;
 813 extern char *option_project_str;
 814 extern char *data_dir;
 815 extern int option_no_data;
 816 extern int option_full_path;
 817 extern int option_param_mapper;
 818 extern int option_call_tree;
 819 extern int num_checks;
 820
 821 enum project_type {
 822         PROJ_NONE,
 823         PROJ_KERNEL,
 824         PROJ_WINE,
 825         PROJ_UNKNOWN,
 826 };
 827 extern enum project_type option_project;
 828 const char *check_name(unsigned short id);
 829 int id_from_name(const char *name);
 830
 831
 832 /* smatch_buf_size.c */
 833 int get_array_size(struct expression *expr);
 834 int get_array_size_bytes(struct expression *expr);
 835 int get_array_size_bytes_min(struct expression *expr);
 836 int get_array_size_bytes_max(struct expression *expr);
 837 struct range_list *get_array_size_bytes_rl(struct expression *expr);
 838 int get_real_array_size(struct expression *expr);
 839 /* smatch_strlen.c */
 840 int get_implied_strlen(struct expression *expr, struct range_list **rl);
 841 int get_size_from_strlen(struct expression *expr);
 842
 843 /* smatch_capped.c */
 844 int is_capped(struct expression *expr);
 845 int is_capped_var_sym(const char *name, struct symbol *sym);
 846
 847 /* check_user_data.c */
 848 int is_user_macro(struct expression *expr);
 849 int is_user_data(struct expression *expr);
 850 int is_capped_user_data(struct expression *expr);
 851 int implied_user_data(struct expression *expr, struct range_list **rl);
 852 int get_user_rl(struct expression *expr, struct range_list **rl);
 853 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl);
 854
 855 /* check_locking.c */
 856 void print_held_locks();
 857
 858 /* check_assigned_expr.c */
 859 struct expression *get_assigned_expr(struct expression *expr);
 860 struct expression *get_assigned_expr_name_sym(const char *name, struct symbol *sym);
 861 /* smatch_return_to_param.c */
 862 void __add_return_to_param_mapping(struct expression *assign, const char *return_string);
 863 char *map_call_to_param_name_sym(struct expression *expr, struct symbol **sym);
 864
 865 /* smatch_comparison.c */
 866 struct compare_data {
 867         const char *var1;
 868         struct var_sym_list *vsl1;
 869         int comparison;
 870         const char *var2;
 871         struct var_sym_list *vsl2;
 872 };
 873 DECLARE_ALLOCATOR(compare_data);
 874 struct smatch_state *alloc_compare_state(
 875                 const char *var1, struct var_sym_list *vsl1,
 876                 int comparison,
 877                 const char *var2, struct var_sym_list *vsl2);
 878 int merge_comparisons(int one, int two);
 879 int combine_comparisons(int left_compare, int right_compare);
 880 int state_to_comparison(struct smatch_state *state);
 881 struct smatch_state *merge_compare_states(struct smatch_state *s1, struct smatch_state *s2);
 882 int get_comparison(struct expression *left, struct expression *right);
 883 int get_comparison_strings(const char *one, const char *two);
 884 int possible_comparison(struct expression *a, int comparison, struct expression *b);
 885 struct state_list *get_all_comparisons(struct expression *expr);
 886 struct state_list *get_all_possible_equal_comparisons(struct expression *expr);
 887 void __add_return_comparison(struct expression *call, const char *range);
 888 void __add_comparison_info(struct expression *expr, struct expression *call, const char *range);
 889 char *get_printed_param_name(struct expression *call, const char *param_name, struct symbol *param_sym);
 890 char *name_sym_to_param_comparison(const char *name, struct symbol *sym);
 891 char *expr_equal_to_param(struct expression *expr, int ignore);
 892 char *expr_lte_to_param(struct expression *expr, int ignore);
 893 char *expr_param_comparison(struct expression *expr, int ignore);
 894 int flip_comparison(int op);
 895 int negate_comparison(int op);
 896 int param_compare_limit_is_impossible(struct expression *expr, int left_param, char *left_key, char *value);
 897 void filter_by_comparison(struct range_list **rl, int comparison, struct range_list *right);
 898 struct sm_state *comparison_implication_hook(struct expression *expr,
 899                         struct state_list **true_stack,
 900                         struct state_list **false_stack);
 901 void __compare_param_limit_hook(struct expression *left_expr, struct expression *right_expr,
 902                                 const char *state_name,
 903                                 struct smatch_state *true_state, struct smatch_state *false_state);
 904
 905
 906 /* smatch_sval.c */
 907 sval_t *sval_alloc(sval_t sval);
 908 sval_t *sval_alloc_permanent(sval_t sval);
 909 sval_t sval_blank(struct expression *expr);
 910 sval_t sval_type_val(struct symbol *type, long long val);
 911 sval_t sval_from_val(struct expression *expr, long long val);
 912 int sval_unsigned(sval_t sval);
 913 int sval_signed(sval_t sval);
 914 int sval_bits(sval_t sval);
 915 int sval_bits_used(sval_t sval);
 916 int sval_is_negative(sval_t sval);
 917 int sval_is_positive(sval_t sval);
 918 int sval_is_min(sval_t sval);
 919 int sval_is_max(sval_t sval);
 920 int sval_is_a_min(sval_t sval);
 921 int sval_is_a_max(sval_t sval);
 922 int sval_is_negative_min(sval_t sval);
 923 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
 924 int sval_cmp_val(sval_t one, long long val);
 925 sval_t sval_min(sval_t one, sval_t two);
 926 sval_t sval_max(sval_t one, sval_t two);
 927 int sval_too_low(struct symbol *type, sval_t sval);
 928 int sval_too_high(struct symbol *type, sval_t sval);
 929 int sval_fits(struct symbol *type, sval_t sval);
 930 sval_t sval_cast(struct symbol *type, sval_t sval);
 931 sval_t sval_preop(sval_t sval, int op);
 932 sval_t sval_binop(sval_t left, int op, sval_t right);
 933 int sval_binop_overflows(sval_t left, int op, sval_t right);
 934 unsigned long long fls_mask(unsigned long long uvalue);
 935 unsigned long long sval_fls_mask(sval_t sval);
 936 const char *sval_to_str(sval_t sval);
 937 const char *sval_to_numstr(sval_t sval);
 938 sval_t ll_to_sval(long long val);
 939
 940 /* smatch_string_list.c */
 941 int list_has_string(struct string_list *str_list, const char *str);
 942 void insert_string(struct string_list **str_list, const char *str);
 943 struct string_list *clone_str_list(struct string_list *orig);
 944 struct string_list *combine_string_lists(struct string_list *one, struct string_list *two);
 945
 946 /* smatch_start_states.c */
 947 struct stree *get_start_states(void);
 948
 949 /* smatch_recurse.c */
 950 int has_symbol(struct expression *expr, struct symbol *sym);
 951 int has_variable(struct expression *expr, struct expression *var);
 952 int has_inc_dec(struct expression *expr);
 953
 954 /* smatch_stored_conditions.c */
 955 struct smatch_state *get_stored_condition(struct expression *expr);
 956 struct expression_list *get_conditions(struct expression *expr);
 957 struct sm_state *stored_condition_implication_hook(struct expression *expr,
 958                         struct state_list **true_stack,
 959                         struct state_list **false_stack);
 960
 961 /* check_string_len.c */
 962 int get_formatted_string_size(struct expression *call, int arg);
 963
 964 /* smatch_param_set.c */
 965 int param_was_set(struct expression *expr);
 966 int param_was_set_var_sym(const char *name, struct symbol *sym);
 967 /* smatch_param_filter.c */
 968 int param_has_filter_data(struct sm_state *sm);
 969
 970 /* smatch_links.c */
 971 void set_up_link_functions(int id, int linkid);
 972 struct smatch_state *merge_link_states(struct smatch_state *s1, struct smatch_state *s2);
 973 void store_link(int link_id, const char *name, struct symbol *sym, const char *link_name, struct symbol *link_sym);
 974
 975 /* smatch_auto_copy.c */
 976 void set_auto_copy(int owner);
 977
 978 /* check_buf_comparison */
 979 struct expression *get_size_variable(struct expression *buf);
 980
 981 /* smatch_untracked_param.c */
 982 void mark_untracked(struct expression *expr, int param, const char *key, const char *value);
 983 void add_untracked_param_hook(void (func)(struct expression *call, int param));
 984
 985 /* smatch_strings.c */
 986 struct state_list *get_strings(struct expression *expr);
 987
 988 /* smatch_estate.c */
 989 int estate_get_single_value(struct smatch_state *state, sval_t *sval);
 990
 991 /* smatch_address.c */
 992 int get_address_rl(struct expression *expr, struct range_list **rl);
 993 int get_member_offset(struct symbol *type, char *member_name);
 994 int get_member_offset_from_deref(struct expression *expr);
 995
 996 /* for now this is in smatch_used_parameter.c */
 997 void __get_state_hook(int owner, const char *name, struct symbol *sym);
 998
 999 /* smatch_buf_comparison.c */
1000 int db_var_is_array_limit(struct expression *array, const char *name, struct var_sym_list *vsl);
1001
1002 struct stree *get_all_return_states(void);
1003 struct stree_stack *get_all_return_strees(void);
1004 int was_inced(const char *name, struct symbol *sym);
1005
1006 /* smatch_constraints.c */
1007 char *get_constraint_str(struct expression *expr);
1008 struct constraint_list *get_constraints(struct expression *expr);
1009 char *unmet_constraint(struct expression *data, struct expression *offset);
1010 char *get_required_constraint(const char *data_str);
1011
1012 static inline int type_bits(struct symbol *type)
1013 {
1014         if (!type)
1015                 return 0;
1016         if (type->type == SYM_PTR)  /* Sparse doesn't set this for &pointers */
1017                 return bits_in_pointer;
1018         if (type->type == SYM_ARRAY)
1019                 return bits_in_pointer;
1020         if (!type->examined)
1021                 examine_symbol_type(type);
1022         return type->bit_size;
1023 }
1024
1025 static inline int type_unsigned(struct symbol *base_type)
1026 {
1027         if (!base_type)
1028                 return 0;
1029         if (base_type->ctype.modifiers & MOD_UNSIGNED)
1030                 return 1;
1031         return 0;
1032 }
1033
1034 static inline int type_positive_bits(struct symbol *type)
1035 {
1036         if (!type)
1037                 return 0;
1038         if (type->type == SYM_ARRAY)
1039                 return bits_in_pointer - 1;
1040         if (type_unsigned(type))
1041                 return type_bits(type);
1042         return type_bits(type) - 1;
1043 }
1044
1045 static inline int sval_positive_bits(sval_t sval)
1046 {
1047         return type_positive_bits(sval.type);
1048 }
1049
1050 /*
1051  * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
1052  */
1053 static inline int sval_cmp(sval_t one, sval_t two)
1054 {
1055         struct symbol *type;
1056
1057         type = one.type;
1058         if (sval_positive_bits(two) > sval_positive_bits(one))
1059                 type = two.type;
1060         if (type_bits(type) < 31)
1061                 type = &int_ctype;
1062
1063         one = sval_cast(type, one);
1064         two = sval_cast(type, two);
1065
1066         if (type_unsigned(type)) {
1067                 if (one.uvalue < two.uvalue)
1068                         return -1;
1069                 if (one.uvalue == two.uvalue)
1070                         return 0;
1071                 return 1;
1072         }
1073         /* fix me handle type promotion and unsigned values */
1074         if (one.value < two.value)
1075                 return -1;
1076         if (one.value == two.value)
1077                 return 0;
1078         return 1;
1079 }
1080
1081 #endif      /* !SMATCH_H_ */