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 short implied:1;
  78         unsigned int nr_children;
  79         unsigned int line;
  80         struct smatch_state *state;
  81         struct stree *pool;
  82         struct sm_state *left;
  83         struct sm_state *right;
  84         struct state_list *possible;
  85 };
  86
  87 struct var_sym {
  88         char *var;
  89         struct symbol *sym;
  90 };
  91 DECLARE_ALLOCATOR(var_sym);
  92 DECLARE_PTR_LIST(var_sym_list, struct var_sym);
  93
  94 enum hook_type {
  95         EXPR_HOOK,
  96         STMT_HOOK,
  97         STMT_HOOK_AFTER,
  98         SYM_HOOK,
  99         STRING_HOOK,
 100         DECLARATION_HOOK,
 101         ASSIGNMENT_HOOK,
 102         RAW_ASSIGNMENT_HOOK,
 103         GLOBAL_ASSIGNMENT_HOOK,
 104         LOGIC_HOOK,
 105         CONDITION_HOOK,
 106         PRELOOP_HOOK,
 107         SELECT_HOOK,
 108         WHOLE_CONDITION_HOOK,
 109         FUNCTION_CALL_HOOK,
 110         CALL_HOOK_AFTER_INLINE,
 111         FUNCTION_CALL_HOOK_AFTER_DB,
 112         CALL_ASSIGNMENT_HOOK,
 113         MACRO_ASSIGNMENT_HOOK,
 114         BINOP_HOOK,
 115         OP_HOOK,
 116         DEREF_HOOK,
 117         CASE_HOOK,
 118         ASM_HOOK,
 119         CAST_HOOK,
 120         SIZEOF_HOOK,
 121         BASE_HOOK,
 122         FUNC_DEF_HOOK,
 123         AFTER_DEF_HOOK,
 124         END_FUNC_HOOK,
 125         AFTER_FUNC_HOOK,
 126         RETURN_HOOK,
 127         INLINE_FN_START,
 128         INLINE_FN_END,
 129         END_FILE_HOOK,
 130         NUM_HOOKS,
 131 };
 132
 133 #define TRUE 1
 134 #define FALSE 0
 135
 136 struct range_list;
 137
 138 void add_hook(void *func, enum hook_type type);
 139 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 140 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 141 void add_merge_hook(int client_id, merge_func_t *func);
 142 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 143 void add_pre_merge_hook(int client_id, void (*hook)(struct sm_state *sm));
 144 typedef void (scope_hook)(void *data);
 145 void add_scope_hook(scope_hook *hook, void *data);
 146 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 147 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 148                                 struct expression *assign_expr, void *data);
 149 typedef void (return_implies_hook)(struct expression *call_expr,
 150                                    int param, char *key, char *value);
 151 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 152 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 153
 154 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 155                               void *info);
 156 void add_implied_return_hook(const char *look_for,
 157                              implied_return_hook *call_back,
 158                              void *info);
 159 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 160                               void *info);
 161 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 162                               void *info);
 163 void return_implies_state(const char *look_for, long long start, long long end,
 164                          implication_hook *call_back, void *info);
 165 void select_return_states_hook(int type, return_implies_hook *callback);
 166 void select_return_states_before(void (*fn)(void));
 167 void select_return_states_after(void (*fn)(void));
 168 int get_implied_return(struct expression *expr, struct range_list **rl);
 169 void allocate_hook_memory(void);
 170
 171 struct modification_data {
 172         struct smatch_state *prev;
 173         struct expression *cur;
 174 };
 175
 176 typedef void (modification_hook)(struct sm_state *sm, struct expression *mod_expr);
 177 void add_modification_hook(int owner, modification_hook *call_back);
 178 void add_indirect_modification_hook(int owner, modification_hook *call_back);
 179 void add_modification_hook_late(int owner, modification_hook *call_back);
 180 void add_indirect_modification_hook_late(int owner, modification_hook *call_back);
 181 struct smatch_state *get_modification_state(struct expression *expr);
 182
 183 int outside_of_function(void);
 184 const char *get_filename(void);
 185 const char *get_base_file(void);
 186 char *get_function(void);
 187 int get_lineno(void);
 188 extern int final_pass;
 189 extern struct symbol *cur_func_sym;
 190 extern int option_debug;
 191 extern int local_debug;
 192 extern int option_info;
 193 extern char *trace_variable;
 194 extern struct stree *global_states;
 195 int is_silenced_function(void);
 196
 197 /* smatch_impossible.c */
 198 int is_impossible_path(void);
 199
 200 extern FILE *sm_outfd;
 201 #define sm_printf(msg...) do { if (final_pass || option_debug || local_debug) fprintf(sm_outfd, msg); } while (0)
 202
 203 static inline void sm_prefix(void)
 204 {
 205         sm_printf("%s:%d %s() ", get_filename(), get_lineno(), get_function());
 206 }
 207
 208 static inline void print_implied_debug_msg();
 209
 210 #define sm_msg(msg...) \
 211 do {                                                           \
 212         print_implied_debug_msg();                             \
 213         if (!option_debug && !final_pass && !local_debug)      \
 214                 break;                                         \
 215         if (!option_info && is_silenced_function())            \
 216                 break;                                         \
 217         sm_prefix();                                           \
 218         sm_printf(msg);                                        \
 219         sm_printf("\n");                                       \
 220 } while (0)
 221
 222 #define local_debug(msg...)                                     \
 223 do {                                                            \
 224         if (local_debug)                                        \
 225                 sm_msg(msg);                                    \
 226 } while (0)
 227
 228 extern char *implied_debug_msg;
 229 static inline void print_implied_debug_msg(void)
 230 {
 231         static struct symbol *last_printed = NULL;
 232
 233         if (!implied_debug_msg)
 234                 return;
 235         if (last_printed == cur_func_sym)
 236                 return;
 237         last_printed = cur_func_sym;
 238         sm_msg("%s", implied_debug_msg);
 239 }
 240
 241 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 242
 243 #define sm_info(msg...) do {                                    \
 244         if (option_debug || (option_info && final_pass)) {      \
 245                 sm_prefix();                                    \
 246                 sm_printf("info: ");                            \
 247                 sm_printf(msg);                                 \
 248                 sm_printf("\n");                                \
 249         }                                                       \
 250 } while(0)
 251
 252 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
 253
 254 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 255 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 256 struct state_list *get_possible_states(int owner, const char *name,
 257                                        struct symbol *sym);
 258 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 259 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 260                struct smatch_state *state);
 261 struct sm_state *set_state_expr(int owner, struct expression *expr,
 262                 struct smatch_state *state);
 263 void delete_state(int owner, const char *name, struct symbol *sym);
 264 void delete_state_expr(int owner, struct expression *expr);
 265 void __delete_all_states_sym(struct symbol *sym);
 266 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 267                            struct smatch_state *true_state,
 268                            struct smatch_state *false_state);
 269 void set_true_false_states_expr(int owner, struct expression *expr,
 270                            struct smatch_state *true_state,
 271                            struct smatch_state *false_state);
 272
 273 struct stree *get_all_states_from_stree(int owner, struct stree *source);
 274 struct stree *get_all_states_stree(int id);
 275 struct stree *__get_cur_stree(void);
 276 int is_reachable(void);
 277
 278 /* smatch_helper.c */
 279 DECLARE_PTR_LIST(int_stack, int);
 280 char *alloc_string(const char *str);
 281 void free_string(char *str);
 282 void append(char *dest, const char *data, int buff_len);
 283 void remove_parens(char *str);
 284 struct smatch_state *alloc_state_num(int num);
 285 struct smatch_state *alloc_state_str(const char *name);
 286 struct smatch_state *alloc_state_expr(struct expression *expr);
 287 struct expression *get_argument_from_call_expr(struct expression_list *args,
 288                                                int num);
 289
 290 char *expr_to_var(struct expression *expr);
 291 struct symbol *expr_to_sym(struct expression *expr);
 292 char *expr_to_str(struct expression *expr);
 293 char *expr_to_str_sym(struct expression *expr,
 294                                      struct symbol **sym_ptr);
 295 char *expr_to_var_sym(struct expression *expr,
 296                              struct symbol **sym_ptr);
 297 char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
 298 char *expr_to_chunk_sym_vsl(struct expression *expr, struct symbol **sym, struct var_sym_list **vsl);
 299 int get_complication_score(struct expression *expr);
 300
 301 int sym_name_is(const char *name, struct expression *expr);
 302 int get_const_value(struct expression *expr, sval_t *sval);
 303 int get_value(struct expression *expr, sval_t *val);
 304 int get_implied_value(struct expression *expr, sval_t *val);
 305 int get_implied_min(struct expression *expr, sval_t *sval);
 306 int get_implied_max(struct expression *expr, sval_t *val);
 307 int get_hard_max(struct expression *expr, sval_t *sval);
 308 int get_fuzzy_min(struct expression *expr, sval_t *min);
 309 int get_fuzzy_max(struct expression *expr, sval_t *max);
 310 int get_absolute_min(struct expression *expr, sval_t *sval);
 311 int get_absolute_max(struct expression *expr, sval_t *sval);
 312 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 313 int parse_call_math_rl(struct expression *call, char *math, struct range_list **rl);
 314 char *get_value_in_terms_of_parameter_math(struct expression *expr);
 315 char *get_value_in_terms_of_parameter_math_var_sym(const char *var, struct symbol *sym);
 316 int is_zero(struct expression *expr);
 317 int known_condition_true(struct expression *expr);
 318 int known_condition_false(struct expression *expr);
 319 int implied_condition_true(struct expression *expr);
 320 int implied_condition_false(struct expression *expr);
 321 int can_integer_overflow(struct symbol *type, struct expression *expr);
 322
 323 int is_array(struct expression *expr);
 324 struct expression *get_array_base(struct expression *expr);
 325 struct expression *get_array_offset(struct expression *expr);
 326 const char *show_state(struct smatch_state *state);
 327 struct statement *get_expression_statement(struct expression *expr);
 328 struct expression *strip_parens(struct expression *expr);
 329 struct expression *strip_expr(struct expression *expr);
 330 void scoped_state(int my_id, const char *name, struct symbol *sym);
 331 int is_error_return(struct expression *expr);
 332 int getting_address(void);
 333 char *get_member_name(struct expression *expr);
 334 char *get_fnptr_name(struct expression *expr);
 335 int cmp_pos(struct position pos1, struct position pos2);
 336 int positions_eq(struct position pos1, struct position pos2);
 337 struct statement *get_current_statement(void);
 338 struct statement *get_prev_statement(void);
 339 int get_param_num_from_sym(struct symbol *sym);
 340 int get_param_num(struct expression *expr);
 341 int ms_since(struct timeval *start);
 342 int parent_is_gone_var_sym(const char *name, struct symbol *sym);
 343 int parent_is_gone(struct expression *expr);
 344 int invert_op(int op);
 345 int expr_equiv(struct expression *one, struct expression *two);
 346 void push_int(struct int_stack **stack, int num);
 347 int pop_int(struct int_stack **stack);
 348
 349 /* smatch_type.c */
 350 struct symbol *get_real_base_type(struct symbol *sym);
 351 int type_bytes(struct symbol *type);
 352 struct symbol *get_pointer_type(struct expression *expr);
 353 struct symbol *get_type(struct expression *expr);
 354 int type_signed(struct symbol *base_type);
 355 int expr_unsigned(struct expression *expr);
 356 int expr_signed(struct expression *expr);
 357 int returns_unsigned(struct symbol *base_type);
 358 int is_pointer(struct expression *expr);
 359 int returns_pointer(struct symbol *base_type);
 360 sval_t sval_type_max(struct symbol *base_type);
 361 sval_t sval_type_min(struct symbol *base_type);
 362 int nr_bits(struct expression *expr);
 363 int is_void_pointer(struct expression *expr);
 364 int is_char_pointer(struct expression *expr);
 365 int is_string(struct expression *expr);
 366 int is_static(struct expression *expr);
 367 int is_local_variable(struct expression *expr);
 368 int types_equiv(struct symbol *one, struct symbol *two);
 369 int fn_static(void);
 370 const char *global_static();
 371 struct symbol *cur_func_return_type(void);
 372 struct symbol *get_arg_type(struct expression *fn, int arg);
 373 struct symbol *get_member_type_from_key(struct expression *expr, char *key);
 374 int is_struct(struct expression *expr);
 375 char *type_to_str(struct symbol *type);
 376
 377 /* smatch_ignore.c */
 378 void add_ignore(int owner, const char *name, struct symbol *sym);
 379 int is_ignored(int owner, const char *name, struct symbol *sym);
 380
 381 /* smatch_var_sym */
 382 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym);
 383 struct var_sym_list *expr_to_vsl(struct expression *expr);
 384 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 385 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr);
 386 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 387 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym);
 388 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl);
 389 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src);
 390 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two);
 391 void free_var_sym_list(struct var_sym_list **list);
 392 void free_var_syms_and_list(struct var_sym_list **list);
 393
 394 /* smatch_tracker */
 395 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 396 void add_tracker(struct tracker_list **list, int owner, const char *name,
 397                 struct symbol *sym);
 398 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 399 void del_tracker(struct tracker_list **list, int owner, const char *name,
 400                 struct symbol *sym);
 401 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 402                 struct symbol *sym);
 403 void free_tracker_list(struct tracker_list **list);
 404 void free_trackers_and_list(struct tracker_list **list);
 405
 406 /* smatch_conditions */
 407 int in_condition(void);
 408
 409 /* smatch_flow.c */
 410
 411 extern int __in_fake_assign;
 412 void smatch (int argc, char **argv);
 413 int inside_loop(void);
 414 int definitely_inside_loop(void);
 415 struct expression *get_switch_expr(void);
 416 int in_expression_statement(void);
 417 void __process_post_op_stack(void);
 418 void set_parent_expr(struct expression *expr, struct expression *parent);
 419 void __split_expr(struct expression *expr);
 420 void __split_label_stmt(struct statement *stmt);
 421 void __split_stmt(struct statement *stmt);
 422 extern int __in_function_def;
 423 extern int option_assume_loops;
 424 extern int option_two_passes;
 425 extern int option_no_db;
 426 extern int option_file_output;
 427 extern int option_time;
 428 extern struct expression_list *big_expression_stack;
 429 extern struct expression_list *big_condition_stack;
 430 extern struct statement_list *big_statement_stack;
 431 int is_assigned_call(struct expression *expr);
 432 int inlinable(struct expression *expr);
 433 extern int __inline_call;
 434 extern struct expression *__inline_fn;
 435 extern int __in_pre_condition;
 436 extern int __bail_on_rest_of_function;
 437 extern struct statement *__prev_stmt;
 438 extern struct statement *__cur_stmt;
 439 extern struct statement *__next_stmt;
 440
 441 /* smatch_struct_assignment.c */
 442 struct expression *get_faked_expression(void);
 443 void __fake_struct_member_assignments(struct expression *expr);
 444
 445 /* smatch_project.c */
 446 int is_no_inline_function(const char *function);
 447
 448 /* smatch_conditions */
 449 void __split_whole_condition(struct expression *expr);
 450 void __handle_logic(struct expression *expr);
 451 int is_condition(struct expression *expr);
 452 int __handle_condition_assigns(struct expression *expr);
 453 int __handle_select_assigns(struct expression *expr);
 454 int __handle_expr_statement_assigns(struct expression *expr);
 455
 456 /* smatch_implied.c */
 457 extern int option_debug_implied;
 458 extern int option_debug_related;
 459 struct range_list_stack;
 460 void param_limit_implications(struct expression *expr, int param, char *key, char *value);
 461 struct stree *__implied_case_stree(struct expression *switch_expr,
 462                                    struct range_list *case_rl,
 463                                    struct range_list_stack **remaining_cases,
 464                                    struct stree **raw_stree);
 465 void overwrite_states_using_pool(struct sm_state *gate_sm, struct sm_state *pool_sm);
 466 int assume(struct expression *expr);
 467 void end_assume(void);
 468
 469 /* smatch_extras.c */
 470 #define SMATCH_EXTRA 1 /* this is my_id from smatch extra set in smatch.c */
 471 extern int RETURN_ID;
 472
 473 struct data_range {
 474         sval_t min;
 475         sval_t max;
 476 };
 477
 478 extern long long valid_ptr_min, valid_ptr_max;
 479 extern sval_t valid_ptr_min_sval, valid_ptr_max_sval;
 480 static const sval_t array_min_sval = {
 481         .type = &ptr_ctype,
 482         {.value = 100000},
 483 };
 484 static const sval_t array_max_sval = {
 485         .type = &ptr_ctype,
 486         {.value = 199999},
 487 };
 488 static const sval_t text_seg_min = {
 489         .type = &ptr_ctype,
 490         {.value = 100000000},
 491 };
 492 static const sval_t text_seg_max = {
 493         .type = &ptr_ctype,
 494         {.value = 177777777},
 495 };
 496 static const sval_t data_seg_min = {
 497         .type = &ptr_ctype,
 498         {.value = 200000000},
 499 };
 500 static const sval_t data_seg_max = {
 501         .type = &ptr_ctype,
 502         {.value = 277777777},
 503 };
 504 static const sval_t bss_seg_min = {
 505         .type = &ptr_ctype,
 506         {.value = 300000000},
 507 };
 508 static const sval_t bss_seg_max = {
 509         .type = &ptr_ctype,
 510         {.value = 377777777},
 511 };
 512 static const sval_t stack_seg_min = {
 513         .type = &ptr_ctype,
 514         {.value = 400000000},
 515 };
 516 static const sval_t stack_seg_max = {
 517         .type = &ptr_ctype,
 518         {.value = 477777777},
 519 };
 520 static const sval_t kmalloc_seg_min = {
 521         .type = &ptr_ctype,
 522         {.value = 500000000},
 523 };
 524 static const sval_t kmalloc_seg_max = {
 525         .type = &ptr_ctype,
 526         {.value = 577777777},
 527 };
 528 static const sval_t vmalloc_seg_min = {
 529         .type = &ptr_ctype,
 530         {.value = 600000000},
 531 };
 532 static const sval_t vmalloc_seg_max = {
 533         .type = &ptr_ctype,
 534         {.value = 677777777},
 535 };
 536
 537 char *get_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 538
 539 #define STRLEN_MAX_RET 1010101
 540
 541 /* smatch_absolute.c */
 542 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 543 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 544
 545 /* smatch_local_values.c */
 546 int get_local_rl(struct expression *expr, struct range_list **rl);
 547 int get_local_max_helper(struct expression *expr, sval_t *sval);
 548 int get_local_min_helper(struct expression *expr, sval_t *sval);
 549
 550 /* smatch_type_value.c */
 551 int get_db_type_rl(struct expression *expr, struct range_list **rl);
 552
 553 /* smatch_states.c */
 554 void __swap_cur_stree(struct stree *stree);
 555 void __push_fake_cur_stree();
 556 struct stree *__pop_fake_cur_stree();
 557 void __free_fake_cur_stree();
 558 void __set_fake_cur_stree_fast(struct stree *stree);
 559 void __pop_fake_cur_stree_fast(void);
 560 void __merge_stree_into_cur(struct stree *stree);
 561
 562 int unreachable(void);
 563 void __set_sm(struct sm_state *sm);
 564 void __set_sm_cur_stree(struct sm_state *sm);
 565 void __set_sm_fake_stree(struct sm_state *sm);
 566 void __set_true_false_sm(struct sm_state *true_state,
 567                         struct sm_state *false_state);
 568 void nullify_path(void);
 569 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 570                                void *unused);
 571 void __unnullify_path(void);
 572 int __path_is_null(void);
 573 void save_all_states(void);
 574 void restore_all_states(void);
 575 void free_goto_stack(void);
 576 void clear_all_states(void);
 577
 578 struct sm_state *get_sm_state(int owner, const char *name,
 579                                 struct symbol *sym);
 580 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 581 void __push_true_states(void);
 582 void __use_false_states(void);
 583 void __discard_false_states(void);
 584 void __merge_false_states(void);
 585 void __merge_true_states(void);
 586
 587 void __negate_cond_stacks(void);
 588 void __use_pre_cond_states(void);
 589 void __use_cond_true_states(void);
 590 void __use_cond_false_states(void);
 591 void __push_cond_stacks(void);
 592 void __fold_in_set_states(void);
 593 void __free_set_states(void);
 594 struct stree *__copy_cond_true_states(void);
 595 struct stree *__copy_cond_false_states(void);
 596 struct stree *__pop_cond_true_stack(void);
 597 struct stree *__pop_cond_false_stack(void);
 598 void __and_cond_states(void);
 599 void __or_cond_states(void);
 600 void __save_pre_cond_states(void);
 601 void __discard_pre_cond_states(void);
 602 struct stree *__get_true_states(void);
 603 struct stree *__get_false_states(void);
 604 void __use_cond_states(void);
 605 extern struct state_list *__last_base_slist;
 606
 607 void __push_continues(void);
 608 void __discard_continues(void);
 609 void __process_continues(void);
 610 void __merge_continues(void);
 611
 612 void __push_breaks(void);
 613 void __process_breaks(void);
 614 int __has_breaks(void);
 615 void __merge_breaks(void);
 616 void __use_breaks(void);
 617
 618 void __save_switch_states(struct expression *switch_expr);
 619 void __discard_switches(void);
 620 void __merge_switches(struct expression *switch_expr, struct range_list *case_rl);
 621 void __push_default(void);
 622 void __set_default(void);
 623 int __pop_default(void);
 624
 625 void __push_conditions(void);
 626 void __discard_conditions(void);
 627
 628 void __save_gotos(const char *name);
 629 void __merge_gotos(const char *name);
 630
 631 void __print_cur_stree(void);
 632
 633 /* smatch_hooks.c */
 634 void __pass_to_client(void *data, enum hook_type type);
 635 void __pass_to_client_no_data(enum hook_type type);
 636 void __pass_case_to_client(struct expression *switch_expr,
 637                            struct range_list *rl);
 638 int __has_merge_function(int client_id);
 639 struct smatch_state *__client_merge_function(int owner,
 640                                              struct smatch_state *s1,
 641                                              struct smatch_state *s2);
 642 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 643 void call_pre_merge_hook(struct sm_state *sm);
 644 void __push_scope_hooks(void);
 645 void __call_scope_hooks(void);
 646
 647 /* smatch_function_hooks.c */
 648 void create_function_hook_hash(void);
 649 void __match_initializer_call(struct symbol *sym);
 650
 651 /* smatch_db.c */
 652 enum info_type {
 653         INTERNAL        = 0,
 654         /*
 655          * Changing these numbers is a pain.  Don't do it.  If you ever use a
 656          * number it can't be re-used right away so there may be gaps.
 657          * We select these in order by type so if the order matters, then give
 658          * it a number below 100-999,9000-9999 ranges. */
 659
 660         PARAM_CLEARED   = 101,
 661         PARAM_LIMIT     = 103,
 662         PARAM_FILTER    = 104,
 663
 664         PARAM_VALUE     = 1001,
 665         BUF_SIZE        = 1002,
 666         USER_DATA       = 1003,
 667         CAPPED_DATA     = 1004,
 668         RETURN_VALUE    = 1005,
 669         DEREFERENCE     = 1006,
 670         RANGE_CAP       = 1007,
 671         LOCK_HELD       = 1008,
 672         LOCK_RELEASED   = 1009,
 673         ABSOLUTE_LIMITS = 1010,
 674         PARAM_ADD       = 1012,
 675         PARAM_FREED     = 1013,
 676         DATA_SOURCE     = 1014,
 677         FUZZY_MAX       = 1015,
 678         STR_LEN         = 1016,
 679         ARRAY_LEN       = 1017,
 680         CAPABLE         = 1018,
 681         NS_CAPABLE      = 1019,
 682         TYPE_LINK       = 1022,
 683         UNTRACKED_PARAM = 1023,
 684         CULL_PATH       = 1024,
 685         PARAM_SET       = 1025,
 686         PARAM_USED      = 1026,
 687         PARAM_COMPARE   = 1028,
 688
 689         /* put random temporary stuff in the 7000-7999 range for testing */
 690         USER_DATA3      = 8017,
 691         USER_DATA_SET   = 9018,
 692         USER_DATA_LIMITED = 9019,
 693 };
 694
 695 void debug_sql(const char *sql);
 696 void debug_mem_sql(const char *sql);
 697 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 698 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm));
 699 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr));
 700 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));
 701 void select_call_implies_hook(int type, void (*callback)(struct expression *arg, char *key, char *value));
 702 struct range_list *db_return_vals(struct expression *expr);
 703 struct range_list *db_return_vals_from_str(const char *fn_name);
 704 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym);
 705 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl);
 706 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym);
 707 const char *get_param_name_var_sym(const char *name, struct symbol *sym);
 708 const char *get_param_name(struct sm_state *sm);
 709 char *get_data_info_name(struct expression *expr);
 710
 711 #define run_sql(call_back, data, sql...)    \
 712 do {                                  \
 713         char sql_txt[1024];           \
 714         if (option_no_db)             \
 715                 break;                \
 716         snprintf(sql_txt, 1024, sql); \
 717         debug_sql(sql_txt);           \
 718         sql_exec(call_back, data, sql_txt); \
 719 } while (0)
 720
 721 /* like run_sql() but for the in-memory database */
 722 #define mem_sql(call_back, data, sql...)                                                \
 723 do {                                                                            \
 724         char sql_txt[1024];                                                     \
 725                                                                                 \
 726         snprintf(sql_txt, sizeof(sql_txt), sql);                                \
 727         sm_debug("in-mem: %s\n", sql_txt);                                      \
 728         debug_mem_sql(sql_txt);                                                 \
 729         sql_mem_exec(call_back, data, sql_txt);                                 \
 730 } while (0)
 731
 732 char *get_static_filter(struct symbol *sym);
 733
 734 void sql_insert_return_states(int return_id, const char *return_ranges,
 735                 int type, int param, const char *key, const char *value);
 736 void sql_insert_caller_info(struct expression *call, int type, int param,
 737                 const char *key, const char *value);
 738 void sql_insert_function_ptr(const char *fn, const char *struct_name);
 739 void sql_insert_return_values(const char *return_values);
 740 void sql_insert_call_implies(int type, int param, const char *key, const char *value);
 741 void sql_insert_function_type_size(const char *member, const char *ranges);
 742 void sql_insert_local_values(const char *name, const char *value);
 743 void sql_insert_function_type_value(const char *type, const char *value);
 744 void sql_insert_function_type_info(int param, const char *value);
 745 void sql_insert_data_info(struct expression *data, int type, const char *value);
 746
 747 void sql_select_return_states(const char *cols, struct expression *call,
 748         int (*callback)(void*, int, char**, char**), void *info);
 749 void sql_select_caller_info(const char *cols, struct symbol *sym,
 750         int (*callback)(void*, int, char**, char**));
 751 void sql_select_call_implies(const char *cols, struct expression *call,
 752         int (*callback)(void*, int, char**, char**));
 753
 754 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 755 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 756
 757 void open_smatch_db(void);
 758
 759 /* smatch_files.c */
 760 int open_data_file(const char *filename);
 761 struct token *get_tokens_file(const char *filename);
 762
 763 /* smatch.c */
 764 extern char *option_debug_check;
 765 extern char *option_project_str;
 766 extern char *data_dir;
 767 extern int option_no_data;
 768 extern int option_spammy;
 769 extern int option_full_path;
 770 extern int option_param_mapper;
 771 extern int option_call_tree;
 772 extern int num_checks;
 773
 774 enum project_type {
 775         PROJ_NONE,
 776         PROJ_KERNEL,
 777         PROJ_WINE,
 778 };
 779 extern enum project_type option_project;
 780 const char *check_name(unsigned short id);
 781
 782
 783 /* smatch_buf_size.c */
 784 int get_array_size(struct expression *expr);
 785 int get_array_size_bytes(struct expression *expr);
 786 int get_array_size_bytes_min(struct expression *expr);
 787 int get_array_size_bytes_max(struct expression *expr);
 788 struct range_list *get_array_size_bytes_rl(struct expression *expr);
 789 int get_real_array_size(struct expression *expr);
 790 /* smatch_strlen.c */
 791 int get_implied_strlen(struct expression *expr, struct range_list **rl);
 792 int get_size_from_strlen(struct expression *expr);
 793
 794 /* smatch_capped.c */
 795 int is_capped(struct expression *expr);
 796 int is_capped_var_sym(const char *name, struct symbol *sym);
 797
 798 /* check_user_data.c */
 799 int is_user_macro(struct expression *expr);
 800 int is_user_data(struct expression *expr);
 801 int is_capped_user_data(struct expression *expr);
 802 int implied_user_data(struct expression *expr, struct range_list **rl);
 803 int get_user_rl(struct expression *expr, struct range_list **rl);
 804 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl);
 805
 806 /* check_locking.c */
 807 void print_held_locks();
 808
 809 /* check_assigned_expr.c */
 810 struct expression *get_assigned_expr(struct expression *expr);
 811 struct expression *get_assigned_expr_name_sym(const char *name, struct symbol *sym);
 812
 813 /* smatch_comparison.c */
 814 struct compare_data {
 815         const char *var1;
 816         struct var_sym_list *vsl1;
 817         int comparison;
 818         const char *var2;
 819         struct var_sym_list *vsl2;
 820 };
 821 int get_comparison(struct expression *left, struct expression *right);
 822 int get_comparison_strings(const char *one, const char *two);
 823 int possible_comparison(struct expression *a, int comparison, struct expression *b);
 824 struct state_list *get_all_comparisons(struct expression *expr);
 825 struct state_list *get_all_possible_equal_comparisons(struct expression *expr);
 826 void __add_comparison_info(struct expression *expr, struct expression *call, const char *range);
 827 char *name_sym_to_param_comparison(const char *name, struct symbol *sym);
 828 char *expr_equal_to_param(struct expression *expr, int ignore);
 829 char *expr_lte_to_param(struct expression *expr, int ignore);
 830 char *expr_param_comparison(struct expression *expr, int ignore);
 831 int flip_comparison(int op);
 832 int negate_comparison(int op);
 833 void filter_by_comparison(struct range_list **rl, int comparison, struct range_list *right);
 834 struct sm_state *comparison_implication_hook(struct expression *expr,
 835                         struct state_list **true_stack,
 836                         struct state_list **false_stack);
 837
 838 /* smatch_sval.c */
 839 sval_t *sval_alloc(sval_t sval);
 840 sval_t *sval_alloc_permanent(sval_t sval);
 841 sval_t sval_blank(struct expression *expr);
 842 sval_t sval_type_val(struct symbol *type, long long val);
 843 sval_t sval_from_val(struct expression *expr, long long val);
 844 int sval_unsigned(sval_t sval);
 845 int sval_signed(sval_t sval);
 846 int sval_bits(sval_t sval);
 847 int sval_bits_used(sval_t sval);
 848 int sval_is_negative(sval_t sval);
 849 int sval_is_positive(sval_t sval);
 850 int sval_is_min(sval_t sval);
 851 int sval_is_max(sval_t sval);
 852 int sval_is_a_min(sval_t sval);
 853 int sval_is_a_max(sval_t sval);
 854 int sval_is_negative_min(sval_t sval);
 855 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
 856 int sval_cmp_val(sval_t one, long long val);
 857 sval_t sval_min(sval_t one, sval_t two);
 858 sval_t sval_max(sval_t one, sval_t two);
 859 int sval_too_low(struct symbol *type, sval_t sval);
 860 int sval_too_high(struct symbol *type, sval_t sval);
 861 int sval_fits(struct symbol *type, sval_t sval);
 862 sval_t sval_cast(struct symbol *type, sval_t sval);
 863 sval_t sval_preop(sval_t sval, int op);
 864 sval_t sval_binop(sval_t left, int op, sval_t right);
 865 int sval_binop_overflows(sval_t left, int op, sval_t right);
 866 unsigned long long fls_mask(unsigned long long uvalue);
 867 unsigned long long sval_fls_mask(sval_t sval);
 868 const char *sval_to_str(sval_t sval);
 869 const char *sval_to_numstr(sval_t sval);
 870 sval_t ll_to_sval(long long val);
 871
 872 /* smatch_string_list.c */
 873 int list_has_string(struct string_list *str_list, const char *str);
 874 void insert_string(struct string_list **str_list, const char *str);
 875 struct string_list *clone_str_list(struct string_list *orig);
 876 struct string_list *combine_string_lists(struct string_list *one, struct string_list *two);
 877
 878 /* smatch_start_states.c */
 879 struct stree *get_start_states(void);
 880
 881 /* smatch_recurse.c */
 882 int has_symbol(struct expression *expr, struct symbol *sym);
 883 int has_variable(struct expression *expr, struct expression *var);
 884 int has_inc_dec(struct expression *expr);
 885
 886 /* smatch_stored_conditions.c */
 887 struct smatch_state *get_stored_condition(struct expression *expr);
 888 struct sm_state *stored_condition_implication_hook(struct expression *expr,
 889                         struct state_list **true_stack,
 890                         struct state_list **false_stack);
 891
 892 /* check_string_len.c */
 893 int get_formatted_string_size(struct expression *call, int arg);
 894
 895 /* smatch_param_set.c */
 896 int param_was_set(struct expression *expr);
 897 int param_was_set_var_sym(const char *name, struct symbol *sym);
 898 /* smatch_param_filter.c */
 899 int param_has_filter_data(struct sm_state *sm);
 900
 901 /* smatch_links.c */
 902 void set_up_link_functions(int id, int linkid);
 903 struct smatch_state *merge_link_states(struct smatch_state *s1, struct smatch_state *s2);
 904 void store_link(int link_id, const char *name, struct symbol *sym, const char *link_name, struct symbol *link_sym);
 905
 906 /* smatch_auto_copy.c */
 907 void set_auto_copy(int owner);
 908
 909 /* check_buf_comparison */
 910 struct expression *get_size_variable(struct expression *buf);
 911
 912 /* smatch_untracked_param.c */
 913 void add_untracked_param_hook(void (func)(struct expression *call, int param));
 914
 915 /* smatch_impossible.c */
 916 int is_impossible_path(void);
 917
 918 /* smatch_strings.c */
 919 struct state_list *get_strings(struct expression *expr);
 920
 921 /* smatch_estate.c */
 922 int estate_get_single_value(struct smatch_state *state, sval_t *sval);
 923
 924 /* smatch_address.c */
 925 int get_address_rl(struct expression *expr, struct range_list **rl);
 926 int get_member_offset(struct symbol *type, char *member_name);
 927 int get_member_offset_from_deref(struct expression *expr);
 928
 929 /* for now this is in smatch_used_parameter.c */
 930 void __get_state_hook(int owner, const char *name, struct symbol *sym);
 931
 932 /* smatch_buf_comparison.c */
 933 int db_var_is_array_limit(struct expression *array, const char *name, struct var_sym_list *vsl);
 934
 935 struct stree *get_all_return_states(void);
 936 struct stree_stack *get_all_return_strees(void);
 937
 938 static inline int type_bits(struct symbol *type)
 939 {
 940         if (!type)
 941                 return 0;
 942         if (type->type == SYM_PTR)  /* Sparse doesn't set this for &pointers */
 943                 return bits_in_pointer;
 944         if (!type->examined)
 945                 examine_symbol_type(type);
 946         return type->bit_size;
 947 }
 948
 949 static inline int type_unsigned(struct symbol *base_type)
 950 {
 951         if (!base_type)
 952                 return 0;
 953         if (base_type->ctype.modifiers & MOD_UNSIGNED)
 954                 return 1;
 955         return 0;
 956 }
 957
 958 static inline int type_positive_bits(struct symbol *type)
 959 {
 960         if (!type)
 961                 return 0;
 962 //      if (type->type == SYM_PTR)
 963 //              return bits_in_pointer;
 964         if (type_unsigned(type))
 965                 return type_bits(type);
 966         return type_bits(type) - 1;
 967 }
 968
 969 static inline int sval_positive_bits(sval_t sval)
 970 {
 971         return type_positive_bits(sval.type);
 972 }
 973
 974 /*
 975  * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
 976  */
 977 static inline int sval_cmp(sval_t one, sval_t two)
 978 {
 979         struct symbol *type;
 980
 981         type = one.type;
 982         if (sval_positive_bits(two) > sval_positive_bits(one))
 983                 type = two.type;
 984         if (type_bits(type) < 31)
 985                 type = &int_ctype;
 986
 987         one = sval_cast(type, one);
 988         two = sval_cast(type, two);
 989
 990         if (type_unsigned(type)) {
 991                 if (one.uvalue < two.uvalue)
 992                         return -1;
 993                 if (one.uvalue == two.uvalue)
 994                         return 0;
 995                 return 1;
 996         }
 997         /* fix me handle type promotion and unsigned values */
 998         if (one.value < two.value)
 999                 return -1;
1000         if (one.value == two.value)
1001                 return 0;
1002         return 1;
1003 }
1004
1005 #endif      /* !SMATCH_H_ */