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  * Copyright 2019 Joyent, Inc.
  18  */
  19 
  20 #ifndef         SMATCH_H_
  21 # define        SMATCH_H_
  22 
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <limits.h>
  26 #include <sys/time.h>
  27 #include <sqlite3.h>
  28 #include "lib.h"
  29 #include "allocate.h"
  30 #include "scope.h"
  31 #include "parse.h"
  32 #include "expression.h"
  33 #include "avl.h"
  34 
  35 typedef struct {
  36         struct symbol *type;
  37         union {
  38                 long long value;
  39                 unsigned long long uvalue;
  40         };
  41 } sval_t;
  42 
  43 typedef long long mtag_t;
  44 
  45 struct smatch_state {
  46         const char *name;
  47         void *data;
  48 };
  49 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  50 extern struct smatch_state undefined;
  51 extern struct smatch_state ghost;
  52 extern struct smatch_state merged;
  53 extern struct smatch_state true_state;
  54 extern struct smatch_state false_state;
  55 DECLARE_ALLOCATOR(smatch_state);
  56 
  57 static inline void *INT_PTR(int i)
  58 {
  59         return (void *)(long)i;
  60 }
  61 
  62 static inline int PTR_INT(void *p)
  63 {
  64         return (int)(long)p;
  65 }
  66 
  67 struct tracker {
  68         char *name;
  69         struct symbol *sym;
  70         unsigned short owner;
  71 };
  72 DECLARE_ALLOCATOR(tracker);
  73 DECLARE_PTR_LIST(tracker_list, struct tracker);
  74 DECLARE_PTR_LIST(stree_stack, struct stree);
  75 
  76 /* The first 3 struct members must match struct tracker */
  77 struct sm_state {
  78         const char *name;
  79         struct symbol *sym;
  80         unsigned short owner;
  81         unsigned short merged:1;
  82         unsigned short skip_implications:1;
  83         unsigned int nr_children;
  84         unsigned int line;
  85         struct smatch_state *state;
  86         struct stree *pool;
  87         struct sm_state *left;
  88         struct sm_state *right;
  89         struct state_list *possible;
  90 };
  91 
  92 struct var_sym {
  93         char *var;
  94         struct symbol *sym;
  95 };
  96 DECLARE_ALLOCATOR(var_sym);
  97 DECLARE_PTR_LIST(var_sym_list, struct var_sym);
  98 
  99 struct constraint {
 100         int op;
 101         int id;
 102 };
 103 DECLARE_PTR_LIST(constraint_list, struct constraint);
 104 
 105 enum hook_type {
 106         EXPR_HOOK,
 107         STMT_HOOK,
 108         STMT_HOOK_AFTER,
 109         SYM_HOOK,
 110         STRING_HOOK,
 111         DECLARATION_HOOK,
 112         ASSIGNMENT_HOOK,
 113         ASSIGNMENT_HOOK_AFTER,
 114         RAW_ASSIGNMENT_HOOK,
 115         GLOBAL_ASSIGNMENT_HOOK,
 116         LOGIC_HOOK,
 117         CONDITION_HOOK,
 118         PRELOOP_HOOK,
 119         SELECT_HOOK,
 120         WHOLE_CONDITION_HOOK,
 121         FUNCTION_CALL_HOOK_BEFORE,
 122         FUNCTION_CALL_HOOK,
 123         CALL_HOOK_AFTER_INLINE,
 124         FUNCTION_CALL_HOOK_AFTER_DB,
 125         CALL_ASSIGNMENT_HOOK,
 126         MACRO_ASSIGNMENT_HOOK,
 127         BINOP_HOOK,
 128         OP_HOOK,
 129         DEREF_HOOK,
 130         CASE_HOOK,
 131         ASM_HOOK,
 132         CAST_HOOK,
 133         SIZEOF_HOOK,
 134         BASE_HOOK,
 135         FUNC_DEF_HOOK,
 136         AFTER_DEF_HOOK,
 137         END_FUNC_HOOK,
 138         AFTER_FUNC_HOOK,
 139         RETURN_HOOK,
 140         INLINE_FN_START,
 141         INLINE_FN_END,
 142         END_FILE_HOOK,
 143         NUM_HOOKS,
 144 };
 145 
 146 #define TRUE 1
 147 #define FALSE 0
 148 
 149 struct range_list;
 150 
 151 void add_hook(void *func, enum hook_type type);
 152 typedef struct smatch_state *(merge_func_t)(struct smatch_state *s1, struct smatch_state *s2);
 153 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
 154 void add_merge_hook(int client_id, merge_func_t *func);
 155 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
 156 void add_pre_merge_hook(int client_id, void (*hook)(struct sm_state *sm));
 157 typedef void (scope_hook)(void *data);
 158 void add_scope_hook(scope_hook *hook, void *data);
 159 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 160 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 161                                 struct expression *assign_expr, void *data);
 162 typedef void (return_implies_hook)(struct expression *call_expr,
 163                                    int param, char *key, char *value);
 164 typedef int (implied_return_hook)(struct expression *call_expr, void *info, struct range_list **rl);
 165 void add_function_hook(const char *look_for, func_hook *call_back, void *data);
 166 
 167 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 168                               void *info);
 169 void add_implied_return_hook(const char *look_for,
 170                              implied_return_hook *call_back,
 171                              void *info);
 172 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 173                               void *info);
 174 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 175                               void *info);
 176 void return_implies_state(const char *look_for, long long start, long long end,
 177                          implication_hook *call_back, void *info);
 178 void select_return_states_hook(int type, return_implies_hook *callback);
 179 void select_return_states_before(void (*fn)(void));
 180 void select_return_states_after(void (*fn)(void));
 181 int get_implied_return(struct expression *expr, struct range_list **rl);
 182 void allocate_hook_memory(void);
 183 
 184 struct modification_data {
 185         struct smatch_state *prev;
 186         struct expression *cur;
 187 };
 188 
 189 typedef void (modification_hook)(struct sm_state *sm, struct expression *mod_expr);
 190 void add_modification_hook(int owner, modification_hook *call_back);
 191 void add_modification_hook_late(int owner, modification_hook *call_back);
 192 struct smatch_state *get_modification_state(struct expression *expr);
 193 
 194 int outside_of_function(void);
 195 const char *get_filename(void);
 196 const char *get_base_file(void);
 197 char *get_function(void);
 198 int get_lineno(void);
 199 extern int final_pass;
 200 extern struct symbol *cur_func_sym;
 201 extern int option_debug;
 202 extern int local_debug;
 203 extern int option_info;
 204 extern int option_spammy;
 205 extern int option_timeout;
 206 extern char *trace_variable;
 207 extern struct stree *global_states;
 208 int is_skipped_function(void);
 209 int is_silenced_function(void);
 210 
 211 /* smatch_impossible.c */
 212 int is_impossible_path(void);
 213 void set_path_impossible(void);
 214 
 215 extern FILE *sm_outfd;
 216 extern FILE *sql_outfd;
 217 extern FILE *caller_info_fd;
 218 extern int sm_nr_checks;
 219 extern int sm_nr_errors;
 220 extern const char *progname;
 221 
 222 /*
 223  * How to use these routines:
 224  *
 225  * sm_fatal(): an internal error of some kind that should immediately exit
 226  * sm_ierror(): an internal error
 227  * sm_perror(): an internal error from parsing input source
 228  * sm_error(): an error from input source
 229  * sm_warning(): a warning from input source
 230  * sm_info(): info message (from option_info)
 231  * sm_debug(): debug message
 232  * sm_msg(): other message (please avoid using this)
 233  */
 234 
 235 #define sm_printf(msg...) do { if (final_pass || option_debug || local_debug) fprintf(sm_outfd, msg); } while (0)
 236 
 237 static inline void sm_prefix(void)
 238 {
 239         sm_printf("%s: %s:%d %s() ", progname, get_filename(), get_lineno(), get_function());
 240 }
 241 
 242 static inline void print_implied_debug_msg();
 243 
 244 extern bool __silence_warnings_for_stmt;
 245 
 246 #define sm_print_msg(type, msg...) \
 247 do {                                                           \
 248         print_implied_debug_msg();                             \
 249         if (!final_pass && !option_debug && !local_debug)      \
 250                 break;                                         \
 251         if (__silence_warnings_for_stmt && !option_debug && !local_debug) \
 252                 break;                                         \
 253         if (!option_info && is_silenced_function())            \
 254                 break;                                         \
 255         sm_prefix();                                           \
 256         if (type == 1) {                                       \
 257                 sm_printf("warn: ");                           \
 258                 sm_nr_checks++;                                \
 259         } else if (type == 2) {                                \
 260                 sm_printf("error: ");                          \
 261                 sm_nr_checks++;                                \
 262         } else if (type == 3) {                                \
 263                 sm_printf("parse error: ");                    \
 264                 sm_nr_errors++;                                \
 265         }                                                      \
 266         sm_printf(msg);                                        \
 267         sm_printf("\n");                                       \
 268 } while (0)
 269 
 270 #define sm_msg(msg...) do { sm_print_msg(0, msg); } while (0)
 271 
 272 #define local_debug(msg...)                                     \
 273 do {                                                            \
 274         if (local_debug)                                        \
 275                 sm_msg(msg);                                    \
 276 } while (0)
 277 
 278 extern char *implied_debug_msg;
 279 static inline void print_implied_debug_msg(void)
 280 {
 281         static struct symbol *last_printed = NULL;
 282 
 283         if (!implied_debug_msg)
 284                 return;
 285         if (last_printed == cur_func_sym)
 286                 return;
 287         last_printed = cur_func_sym;
 288         sm_msg("%s", implied_debug_msg);
 289 }
 290 
 291 #define sm_debug(msg...) do { if (option_debug) sm_printf(msg); } while (0)
 292 
 293 #define sm_info(msg...) do {                                    \
 294         if (option_debug || (option_info && final_pass)) {      \
 295                 sm_prefix();                                    \
 296                 sm_printf("info: ");                            \
 297                 sm_printf(msg);                                 \
 298                 sm_printf("\n");                                \
 299         }                                                       \
 300 } while(0)
 301 
 302 #define sm_warning(msg...) do { sm_print_msg(1, msg); } while (0)
 303 #define sm_error(msg...) do { sm_print_msg(2, msg); } while (0)
 304 #define sm_perror(msg...) do { sm_print_msg(3, msg); } while (0)
 305 
 306 static inline void sm_fatal(const char *fmt, ...)
 307 {
 308         va_list args;
 309 
 310         va_start(args, fmt);
 311         vfprintf(sm_outfd, fmt, args);
 312         va_end(args);
 313 
 314         fprintf(sm_outfd, "\n");
 315 
 316         exit(1);
 317 }
 318 
 319 static inline void sm_ierror(const char *fmt, ...)
 320 {
 321         va_list args;
 322 
 323         sm_nr_errors++;
 324 
 325         fprintf(sm_outfd, "internal error: ");
 326 
 327         va_start(args, fmt);
 328         vfprintf(sm_outfd, fmt, args);
 329         va_end(args);
 330 
 331         fprintf(sm_outfd, "\n");
 332 }
 333 #define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
 334 
 335 struct smatch_state *__get_state(int owner, const char *name, struct symbol *sym);
 336 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 337 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 338 struct state_list *get_possible_states(int owner, const char *name,
 339                                        struct symbol *sym);
 340 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 341 struct sm_state *set_state(int owner, const char *name, struct symbol *sym,
 342                struct smatch_state *state);
 343 struct sm_state *set_state_expr(int owner, struct expression *expr,
 344                 struct smatch_state *state);
 345 void delete_state(int owner, const char *name, struct symbol *sym);
 346 void delete_state_expr(int owner, struct expression *expr);
 347 void __delete_all_states_sym(struct symbol *sym);
 348 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 349                            struct smatch_state *true_state,
 350                            struct smatch_state *false_state);
 351 void set_true_false_states_expr(int owner, struct expression *expr,
 352                            struct smatch_state *true_state,
 353                            struct smatch_state *false_state);
 354 
 355 struct stree *get_all_states_from_stree(int owner, struct stree *source);
 356 struct stree *get_all_states_stree(int id);
 357 struct stree *__get_cur_stree(void);
 358 int is_reachable(void);
 359 void add_get_state_hook(void (*fn)(int owner, const char *name, struct symbol *sym));
 360 
 361 /* smatch_helper.c */
 362 DECLARE_PTR_LIST(int_stack, int);
 363 char *alloc_string(const char *str);
 364 void free_string(char *str);
 365 void append(char *dest, const char *data, int buff_len);
 366 void remove_parens(char *str);
 367 struct smatch_state *alloc_state_num(int num);
 368 struct smatch_state *alloc_state_str(const char *name);
 369 struct smatch_state *alloc_state_expr(struct expression *expr);
 370 struct expression *get_argument_from_call_expr(struct expression_list *args,
 371                                                int num);
 372 
 373 char *expr_to_var(struct expression *expr);
 374 struct symbol *expr_to_sym(struct expression *expr);
 375 char *expr_to_str(struct expression *expr);
 376 char *expr_to_str_sym(struct expression *expr,
 377                                      struct symbol **sym_ptr);
 378 char *expr_to_var_sym(struct expression *expr,
 379                              struct symbol **sym_ptr);
 380 char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
 381 char *expr_to_chunk_sym_vsl(struct expression *expr, struct symbol **sym, struct var_sym_list **vsl);
 382 int get_complication_score(struct expression *expr);
 383 
 384 int sym_name_is(const char *name, struct expression *expr);
 385 int get_const_value(struct expression *expr, sval_t *sval);
 386 int get_value(struct expression *expr, sval_t *val);
 387 int get_implied_value(struct expression *expr, sval_t *val);
 388 int get_implied_min(struct expression *expr, sval_t *sval);
 389 int get_implied_max(struct expression *expr, sval_t *val);
 390 int get_hard_max(struct expression *expr, sval_t *sval);
 391 int get_fuzzy_min(struct expression *expr, sval_t *min);
 392 int get_fuzzy_max(struct expression *expr, sval_t *max);
 393 int get_absolute_min(struct expression *expr, sval_t *sval);
 394 int get_absolute_max(struct expression *expr, sval_t *sval);
 395 int parse_call_math(struct expression *expr, char *math, sval_t *val);
 396 int parse_call_math_rl(struct expression *call, char *math, struct range_list **rl);
 397 char *get_value_in_terms_of_parameter_math(struct expression *expr);
 398 char *get_value_in_terms_of_parameter_math_var_sym(const char *var, struct symbol *sym);
 399 int is_zero(struct expression *expr);
 400 int known_condition_true(struct expression *expr);
 401 int known_condition_false(struct expression *expr);
 402 int implied_condition_true(struct expression *expr);
 403 int implied_condition_false(struct expression *expr);
 404 int can_integer_overflow(struct symbol *type, struct expression *expr);
 405 void clear_math_cache(void);
 406 
 407 int is_array(struct expression *expr);
 408 struct expression *get_array_base(struct expression *expr);
 409 struct expression *get_array_offset(struct expression *expr);
 410 const char *show_state(struct smatch_state *state);
 411 struct statement *get_expression_statement(struct expression *expr);
 412 struct expression *strip_parens(struct expression *expr);
 413 struct expression *strip_expr(struct expression *expr);
 414 struct expression *strip_expr_set_parent(struct expression *expr);
 415 void scoped_state(int my_id, const char *name, struct symbol *sym);
 416 int is_error_return(struct expression *expr);
 417 int getting_address(void);
 418 int get_struct_and_member(struct expression *expr, const char **type, const char **member);
 419 char *get_member_name(struct expression *expr);
 420 char *get_fnptr_name(struct expression *expr);
 421 int cmp_pos(struct position pos1, struct position pos2);
 422 int positions_eq(struct position pos1, struct position pos2);
 423 struct statement *get_current_statement(void);
 424 struct statement *get_prev_statement(void);
 425 struct expression *get_last_expr_from_expression_stmt(struct expression *expr);
 426 int get_param_num_from_sym(struct symbol *sym);
 427 int get_param_num(struct expression *expr);
 428 int ms_since(struct timeval *start);
 429 int parent_is_gone_var_sym(const char *name, struct symbol *sym);
 430 int parent_is_gone(struct expression *expr);
 431 int invert_op(int op);
 432 int expr_equiv(struct expression *one, struct expression *two);
 433 void push_int(struct int_stack **stack, int num);
 434 int pop_int(struct int_stack **stack);
 435 
 436 /* smatch_type.c */
 437 struct symbol *get_real_base_type(struct symbol *sym);
 438 int type_bytes(struct symbol *type);
 439 int array_bytes(struct symbol *type);
 440 struct symbol *get_pointer_type(struct expression *expr);
 441 struct symbol *get_type(struct expression *expr);
 442 struct symbol *get_final_type(struct expression *expr);
 443 struct symbol *get_promoted_type(struct symbol *left, struct symbol *right);
 444 int type_signed(struct symbol *base_type);
 445 int expr_unsigned(struct expression *expr);
 446 int expr_signed(struct expression *expr);
 447 int returns_unsigned(struct symbol *base_type);
 448 int is_pointer(struct expression *expr);
 449 int returns_pointer(struct symbol *base_type);
 450 sval_t sval_type_max(struct symbol *base_type);
 451 sval_t sval_type_min(struct symbol *base_type);
 452 int nr_bits(struct expression *expr);
 453 int is_void_pointer(struct expression *expr);
 454 int is_char_pointer(struct expression *expr);
 455 int is_string(struct expression *expr);
 456 int is_static(struct expression *expr);
 457 int is_local_variable(struct expression *expr);
 458 int types_equiv(struct symbol *one, struct symbol *two);
 459 int fn_static(void);
 460 const char *global_static();
 461 struct symbol *cur_func_return_type(void);
 462 struct symbol *get_arg_type(struct expression *fn, int arg);
 463 struct symbol *get_member_type_from_key(struct expression *expr, const char *key);
 464 struct symbol *get_arg_type_from_key(struct expression *fn, int param, struct expression *arg, const char *key);
 465 int is_struct(struct expression *expr);
 466 char *type_to_str(struct symbol *type);
 467 
 468 /* smatch_ignore.c */
 469 void add_ignore(int owner, const char *name, struct symbol *sym);
 470 int is_ignored(int owner, const char *name, struct symbol *sym);
 471 void add_ignore_expr(int owner, struct expression *expr);
 472 int is_ignored_expr(int owner, struct expression *expr);
 473 
 474 /* smatch_var_sym */
 475 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym);
 476 struct var_sym_list *expr_to_vsl(struct expression *expr);
 477 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 478 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr);
 479 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym);
 480 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym);
 481 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl);
 482 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src);
 483 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two);
 484 int var_sym_lists_equiv(struct var_sym_list *one, struct var_sym_list *two);
 485 void free_var_sym_list(struct var_sym_list **list);
 486 void free_var_syms_and_list(struct var_sym_list **list);
 487 
 488 /* smatch_tracker */
 489 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 490 void add_tracker(struct tracker_list **list, int owner, const char *name,
 491                 struct symbol *sym);
 492 void add_tracker_expr(struct tracker_list **list, int owner, struct expression *expr);
 493 void del_tracker(struct tracker_list **list, int owner, const char *name,
 494                 struct symbol *sym);
 495 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 496                 struct symbol *sym);
 497 void free_tracker_list(struct tracker_list **list);
 498 void free_trackers_and_list(struct tracker_list **list);
 499 
 500 /* smatch_conditions */
 501 int in_condition(void);
 502 
 503 /* smatch_flow.c */
 504 
 505 extern int __in_fake_assign;
 506 extern int __in_fake_parameter_assign;
 507 extern int __in_fake_struct_assign;
 508 extern int in_fake_env;
 509 void smatch (int argc, char **argv);
 510 int inside_loop(void);
 511 int definitely_inside_loop(void);
 512 struct expression *get_switch_expr(void);
 513 int in_expression_statement(void);
 514 void __process_post_op_stack(void);
 515 void __split_expr(struct expression *expr);
 516 void __split_label_stmt(struct statement *stmt);
 517 void __split_stmt(struct statement *stmt);
 518 extern int __in_function_def;
 519 extern int option_assume_loops;
 520 extern int option_two_passes;
 521 extern int option_no_db;
 522 extern int option_file_output;
 523 extern int option_time;
 524 extern struct expression_list *big_expression_stack;
 525 extern struct expression_list *big_condition_stack;
 526 extern struct statement_list *big_statement_stack;
 527 int is_assigned_call(struct expression *expr);
 528 int inlinable(struct expression *expr);
 529 extern int __inline_call;
 530 extern struct expression *__inline_fn;
 531 extern int __in_pre_condition;
 532 extern int __bail_on_rest_of_function;
 533 extern struct statement *__prev_stmt;
 534 extern struct statement *__cur_stmt;
 535 extern struct statement *__next_stmt;
 536 void init_fake_env(void);
 537 void end_fake_env(void);
 538 int time_parsing_function(void);
 539 
 540 /* smatch_struct_assignment.c */
 541 struct expression *get_faked_expression(void);
 542 void __fake_struct_member_assignments(struct expression *expr);
 543 
 544 /* smatch_project.c */
 545 int is_no_inline_function(const char *function);
 546 
 547 /* smatch_conditions */
 548 void __split_whole_condition(struct expression *expr);
 549 void __handle_logic(struct expression *expr);
 550 int is_condition(struct expression *expr);
 551 int __handle_condition_assigns(struct expression *expr);
 552 int __handle_select_assigns(struct expression *expr);
 553 int __handle_expr_statement_assigns(struct expression *expr);
 554 
 555 /* smatch_implied.c */
 556 extern int option_debug_implied;
 557 extern int option_debug_related;
 558 struct range_list_stack;
 559 void param_limit_implications(struct expression *expr, int param, char *key, char *value);
 560 struct stree *__implied_case_stree(struct expression *switch_expr,
 561                                    struct range_list *case_rl,
 562                                    struct range_list_stack **remaining_cases,
 563                                    struct stree **raw_stree);
 564 void overwrite_states_using_pool(struct sm_state *gate_sm, struct sm_state *pool_sm);
 565 int assume(struct expression *expr);
 566 void end_assume(void);
 567 int impossible_assumption(struct expression *left, int op, sval_t sval);
 568 
 569 /* smatch_extras.c */
 570 #define SMATCH_EXTRA 5 /* this is my_id from smatch extra set in smatch.c */
 571 extern int RETURN_ID;
 572 
 573 struct data_range {
 574         sval_t min;
 575         sval_t max;
 576 };
 577 
 578 #define MTAG_ALIAS_BIT (1ULL << 63)
 579 #define MTAG_OFFSET_MASK 0xfffULL
 580 
 581 extern long long valid_ptr_min, valid_ptr_max;
 582 extern sval_t valid_ptr_min_sval, valid_ptr_max_sval;
 583 extern struct range_list *valid_ptr_rl;
 584 static const sval_t array_min_sval = {
 585         .type = &ptr_ctype,
 586         {.value = 100000},
 587 };
 588 static const sval_t array_max_sval = {
 589         .type = &ptr_ctype,
 590         {.value = 199999},
 591 };
 592 static const sval_t text_seg_min = {
 593         .type = &ptr_ctype,
 594         {.value = 100000000},
 595 };
 596 static const sval_t text_seg_max = {
 597         .type = &ptr_ctype,
 598         {.value = 177777777},
 599 };
 600 static const sval_t data_seg_min = {
 601         .type = &ptr_ctype,
 602         {.value = 200000000},
 603 };
 604 static const sval_t data_seg_max = {
 605         .type = &ptr_ctype,
 606         {.value = 277777777},
 607 };
 608 static const sval_t bss_seg_min = {
 609         .type = &ptr_ctype,
 610         {.value = 300000000},
 611 };
 612 static const sval_t bss_seg_max = {
 613         .type = &ptr_ctype,
 614         {.value = 377777777},
 615 };
 616 static const sval_t stack_seg_min = {
 617         .type = &ptr_ctype,
 618         {.value = 400000000},
 619 };
 620 static const sval_t stack_seg_max = {
 621         .type = &ptr_ctype,
 622         {.value = 477777777},
 623 };
 624 static const sval_t kmalloc_seg_min = {
 625         .type = &ptr_ctype,
 626         {.value = 500000000},
 627 };
 628 static const sval_t kmalloc_seg_max = {
 629         .type = &ptr_ctype,
 630         {.value = 577777777},
 631 };
 632 static const sval_t vmalloc_seg_min = {
 633         .type = &ptr_ctype,
 634         {.value = 600000000},
 635 };
 636 static const sval_t vmalloc_seg_max = {
 637         .type = &ptr_ctype,
 638         {.value = 677777777},
 639 };
 640 static const sval_t fn_ptr_min = {
 641         .type = &ptr_ctype,
 642         {.value = 700000000},
 643 };
 644 static const sval_t fn_ptr_max = {
 645         .type = &ptr_ctype,
 646         {.value = 777777777},
 647 };
 648 
 649 char *get_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 650 char *map_call_to_other_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 651 char *map_long_to_short_name_sym(const char *name, struct symbol *sym, struct symbol **new_sym);
 652 char *map_long_to_short_name_sym_nostack(const char *name, struct symbol *sym, struct symbol **new_sym);
 653 
 654 #define STRLEN_MAX_RET 1010101
 655 
 656 /* smatch_absolute.c */
 657 int get_absolute_min_helper(struct expression *expr, sval_t *sval);
 658 int get_absolute_max_helper(struct expression *expr, sval_t *sval);
 659 
 660 /* smatch_local_values.c */
 661 int get_local_rl(struct expression *expr, struct range_list **rl);
 662 int get_local_max_helper(struct expression *expr, sval_t *sval);
 663 int get_local_min_helper(struct expression *expr, sval_t *sval);
 664 
 665 /* smatch_type_value.c */
 666 int get_db_type_rl(struct expression *expr, struct range_list **rl);
 667 /* smatch_data_val.c */
 668 int get_mtag_rl(struct expression *expr, struct range_list **rl);
 669 /* smatch_array_values.c */
 670 int get_array_rl(struct expression *expr, struct range_list **rl);
 671 
 672 /* smatch_states.c */
 673 void __swap_cur_stree(struct stree *stree);
 674 void __push_fake_cur_stree();
 675 struct stree *__pop_fake_cur_stree();
 676 void __free_fake_cur_stree();
 677 void __set_fake_cur_stree_fast(struct stree *stree);
 678 void __pop_fake_cur_stree_fast(void);
 679 void __merge_stree_into_cur(struct stree *stree);
 680 
 681 int unreachable(void);
 682 void __set_sm(struct sm_state *sm);
 683 void __set_sm_cur_stree(struct sm_state *sm);
 684 void __set_sm_fake_stree(struct sm_state *sm);
 685 void __set_true_false_sm(struct sm_state *true_state,
 686                         struct sm_state *false_state);
 687 void nullify_path(void);
 688 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 689                                void *unused);
 690 void __unnullify_path(void);
 691 int __path_is_null(void);
 692 void save_all_states(void);
 693 void restore_all_states(void);
 694 void free_goto_stack(void);
 695 void clear_all_states(void);
 696 
 697 struct sm_state *get_sm_state(int owner, const char *name,
 698                                 struct symbol *sym);
 699 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 700 void __push_true_states(void);
 701 void __use_false_states(void);
 702 void __discard_false_states(void);
 703 void __merge_false_states(void);
 704 void __merge_true_states(void);
 705 
 706 void __negate_cond_stacks(void);
 707 void __use_pre_cond_states(void);
 708 void __use_cond_true_states(void);
 709 void __use_cond_false_states(void);
 710 void __push_cond_stacks(void);
 711 void __fold_in_set_states(void);
 712 void __free_set_states(void);
 713 struct stree *__copy_cond_true_states(void);
 714 struct stree *__copy_cond_false_states(void);
 715 struct stree *__pop_cond_true_stack(void);
 716 struct stree *__pop_cond_false_stack(void);
 717 void __and_cond_states(void);
 718 void __or_cond_states(void);
 719 void __save_pre_cond_states(void);
 720 void __discard_pre_cond_states(void);
 721 struct stree *__get_true_states(void);
 722 struct stree *__get_false_states(void);
 723 void __use_cond_states(void);
 724 extern struct state_list *__last_base_slist;
 725 
 726 void __push_continues(void);
 727 void __discard_continues(void);
 728 void __process_continues(void);
 729 void __merge_continues(void);
 730 
 731 void __push_breaks(void);
 732 void __process_breaks(void);
 733 int __has_breaks(void);
 734 void __merge_breaks(void);
 735 void __use_breaks(void);
 736 
 737 void __save_switch_states(struct expression *switch_expr);
 738 void __discard_switches(void);
 739 int have_remaining_cases(void);
 740 void __merge_switches(struct expression *switch_expr, struct range_list *case_rl);
 741 void __push_default(void);
 742 void __set_default(void);
 743 int __pop_default(void);
 744 
 745 void __push_conditions(void);
 746 void __discard_conditions(void);
 747 
 748 void __save_gotos(const char *name, struct symbol *sym);
 749 void __merge_gotos(const char *name, struct symbol *sym);
 750 
 751 void __print_cur_stree(void);
 752 
 753 /* smatch_hooks.c */
 754 void __pass_to_client(void *data, enum hook_type type);
 755 void __pass_to_client_no_data(enum hook_type type);
 756 void __pass_case_to_client(struct expression *switch_expr,
 757                            struct range_list *rl);
 758 int __has_merge_function(int client_id);
 759 struct smatch_state *__client_merge_function(int owner,
 760                                              struct smatch_state *s1,
 761                                              struct smatch_state *s2);
 762 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 763 void call_pre_merge_hook(struct sm_state *sm);
 764 void __push_scope_hooks(void);
 765 void __call_scope_hooks(void);
 766 
 767 /* smatch_function_hooks.c */
 768 void create_function_hook_hash(void);
 769 void __match_initializer_call(struct symbol *sym);
 770 
 771 /* smatch_db.c */
 772 enum info_type {
 773         INTERNAL        = 0,
 774         /*
 775          * Changing these numbers is a pain.  Don't do it.  If you ever use a
 776          * number it can't be re-used right away so there may be gaps.
 777          * We select these in order by type so if the order matters, then give
 778          * it a number below 100-999,9000-9999 ranges. */
 779 
 780         PARAM_CLEARED   = 101,
 781         PARAM_LIMIT     = 103,
 782         PARAM_FILTER    = 104,
 783 
 784         PARAM_VALUE     = 1001,
 785         BUF_SIZE        = 1002,
 786         USER_DATA       = 1003,
 787         CAPPED_DATA     = 1004,
 788         RETURN_VALUE    = 1005,
 789         DEREFERENCE     = 1006,
 790         RANGE_CAP       = 1007,
 791         LOCK_HELD       = 1008,
 792         LOCK_RELEASED   = 1009,
 793         ABSOLUTE_LIMITS = 1010,
 794         PARAM_ADD       = 1012,
 795         PARAM_FREED     = 1013,
 796         DATA_SOURCE     = 1014,
 797         FUZZY_MAX       = 1015,
 798         STR_LEN         = 1016,
 799         ARRAY_LEN       = 1017,
 800         CAPABLE         = 1018,
 801         NS_CAPABLE      = 1019,
 802         CONTAINER       = 1020,
 803         CASTED_CALL     = 1021,
 804         TYPE_LINK       = 1022,
 805         UNTRACKED_PARAM = 1023,
 806         CULL_PATH       = 1024,
 807         PARAM_SET       = 1025,
 808         PARAM_USED      = 1026,
 809         BYTE_UNITS      = 1027,
 810         COMPARE_LIMIT   = 1028,
 811         PARAM_COMPARE   = 1029,
 812         CONSTRAINT      = 1031,
 813         PASSES_TYPE     = 1032,
 814         CONSTRAINT_REQUIRED = 1033,
 815         NOSPEC          = 1035,
 816         NOSPEC_WB       = 1036,
 817         STMT_CNT        = 1037,
 818         TERMINATED      = 1038,
 819 
 820         /* put random temporary stuff in the 7000-7999 range for testing */
 821         USER_DATA3      = 8017,
 822         USER_DATA3_SET  = 9017,
 823         NO_OVERFLOW     = 8018,
 824         NO_OVERFLOW_SIMPLE = 8019,
 825         LOCKED          = 8020,
 826         UNLOCKED        = 8021,
 827         SET_FS          = 8022,
 828         ATOMIC_INC      = 8023,
 829         ATOMIC_DEC      = 8024,
 830         NO_SIDE_EFFECT  = 8025,
 831         FN_ARG_LINK     = 8028,
 832         DATA_VALUE      = 8029,
 833         ARRAYSIZE_ARG   = 8033,
 834         SIZEOF_ARG      = 8034,
 835         MEMORY_TAG      = 8036,
 836         MTAG_ASSIGN     = 8035,
 837         STRING_VALUE    = 8041,
 838 };
 839 
 840 extern struct sqlite3 *smatch_db;
 841 extern struct sqlite3 *mem_db;
 842 extern struct sqlite3 *cache_db;
 843 
 844 void db_ignore_states(int id);
 845 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type);
 846 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm));
 847 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr));
 848 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));
 849 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value));
 850 void select_return_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value));
 851 struct range_list *db_return_vals(struct expression *expr);
 852 struct range_list *db_return_vals_from_str(const char *fn_name);
 853 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym);
 854 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl);
 855 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym);
 856 const char *state_name_to_param_name(const char *state_name, const char *param_name);
 857 const char *get_param_name_var_sym(const char *name, struct symbol *sym);
 858 const char *get_param_name(struct sm_state *sm);
 859 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym);
 860 const char *get_mtag_name_expr(struct expression *expr);
 861 char *get_data_info_name(struct expression *expr);
 862 
 863 char *escape_newlines(const char *str);
 864 void sql_exec(struct sqlite3 *db, int (*callback)(void*, int, char**, char**), void *data, const char *sql);
 865 
 866 #define sql_helper(db, call_back, data, sql...)                                 \
 867 do {                                                                            \
 868         char sql_txt[1024];                                                     \
 869                                                                                 \
 870         sqlite3_snprintf(sizeof(sql_txt), sql_txt, sql);                        \
 871         sm_debug("debug: %s\n", sql_txt);                                       \
 872         sql_exec(db, call_back, data, sql_txt);                                 \
 873 } while (0)
 874 
 875 
 876 #define run_sql(call_back, data, sql...)                                        \
 877 do {                                                                            \
 878         if (option_no_db)                                                       \
 879                 break;                                                          \
 880         sql_helper(smatch_db, call_back, data, sql);                            \
 881 } while (0)
 882 
 883 #define mem_sql(call_back, data, sql...)                                        \
 884         sql_helper(mem_db, call_back, data, sql)
 885 
 886 #define cache_sql(call_back, data, sql...)                                      \
 887         sql_helper(cache_db, call_back, data, sql)
 888 
 889 #define sql_insert_helper(table, db, ignore, late, values...)                   \
 890 do {                                                                            \
 891         struct sqlite3 *_db = db;                                               \
 892                                                                                 \
 893         if (__inline_fn && !_db)                                                \
 894                 _db = mem_db;                                                   \
 895         if (_db) {                                                              \
 896                 char buf[1024];                                                 \
 897                 char *err, *p = buf;                                            \
 898                 int rc;                                                         \
 899                                                                                 \
 900                 p += snprintf(p, buf + sizeof(buf) - p,                         \
 901                               "insert %sinto %s values (",                      \
 902                               ignore ? "or ignore " : "", #table);              \
 903                 p += snprintf(p, buf + sizeof(buf) - p, values);                \
 904                 p += snprintf(p, buf + sizeof(buf) - p, ");");                  \
 905                 sm_debug("mem-db: %s\n", buf);                                  \
 906                 rc = sqlite3_exec(_db, buf, NULL, NULL, &err);                      \
 907                 if (rc != SQLITE_OK) {                                          \
 908                         sm_ierror("SQL error #2: %s", err);                     \
 909                         sm_ierror("SQL: '%s'", buf);                            \
 910                         parse_error = 1;                                        \
 911                 }                                                               \
 912                 break;                                                          \
 913         }                                                                       \
 914         if (option_info) {                                                      \
 915                 FILE *tmp_fd = sm_outfd;                                        \
 916                 sm_outfd = sql_outfd;                                           \
 917                 sm_prefix();                                                    \
 918                 sm_printf("SQL%s: insert %sinto " #table " values(",            \
 919                           late ? "_late" : "", ignore ? "or ignore " : "");     \
 920                 sm_printf(values);                                              \
 921                 sm_printf(");\n");                                              \
 922                 sm_outfd = tmp_fd;                                              \
 923         }                                                                       \
 924 } while (0)
 925 
 926 #define sql_insert(table, values...) sql_insert_helper(table, 0, 0, 0, values);
 927 #define sql_insert_or_ignore(table, values...) sql_insert_helper(table, 0, 1, 0, values);
 928 #define sql_insert_late(table, values...) sql_insert_helper(table, 0, 0, 1, values);
 929 #define sql_insert_cache(table, values...) sql_insert_helper(table, cache_db, 1, 0, values);
 930 
 931 char *get_static_filter(struct symbol *sym);
 932 
 933 void sql_insert_return_states(int return_id, const char *return_ranges,
 934                 int type, int param, const char *key, const char *value);
 935 void sql_insert_caller_info(struct expression *call, int type, int param,
 936                 const char *key, const char *value);
 937 void sql_insert_function_ptr(const char *fn, const char *struct_name);
 938 void sql_insert_return_values(const char *return_values);
 939 void sql_insert_return_implies(int type, int param, const char *key, const char *value);
 940 void sql_insert_function_type_size(const char *member, const char *ranges);
 941 void sql_insert_function_type_info(int type, const char *struct_type, const char *member, const char *value);
 942 void sql_insert_type_info(int type, const char *member, const char *value);
 943 void sql_insert_local_values(const char *name, const char *value);
 944 void sql_insert_function_type_value(const char *type, const char *value);
 945 void sql_insert_function_type(int param, const char *value);
 946 void sql_insert_parameter_name(int param, const char *value);
 947 void sql_insert_data_info(struct expression *data, int type, const char *value);
 948 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value);
 949 void sql_save_constraint(const char *con);
 950 void sql_save_constraint_required(const char *data, int op, const char *limit);
 951 void sql_copy_constraint_required(const char *new_limit, const char *old_limit);
 952 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data);
 953 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value);
 954 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name);
 955 void insert_mtag_data(sval_t sval, struct range_list *rl);
 956 void sql_insert_mtag_map(mtag_t tag, int offset, mtag_t container);
 957 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias);
 958 int mtag_map_select_container(mtag_t tag, int offset, mtag_t *container);
 959 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag);
 960 
 961 void sql_select_return_states(const char *cols, struct expression *call,
 962         int (*callback)(void*, int, char**, char**), void *info);
 963 void sql_select_call_implies(const char *cols, struct expression *call,
 964         int (*callback)(void*, int, char**, char**));
 965 
 966 void open_smatch_db(char *db_file);
 967 
 968 /* smatch_files.c */
 969 int open_data_file(const char *filename);
 970 int open_schema_file(const char *schema);
 971 struct token *get_tokens_file(const char *filename);
 972 
 973 /* smatch.c */
 974 extern char *option_debug_check;
 975 extern char *option_project_str;
 976 extern char *bin_dir;
 977 extern char *data_dir;
 978 extern int option_no_data;
 979 extern int option_full_path;
 980 extern int option_param_mapper;
 981 extern int option_call_tree;
 982 extern int num_checks;
 983 
 984 enum project_type {
 985         PROJ_NONE,
 986         PROJ_KERNEL,
 987         PROJ_WINE,
 988         PROJ_ILLUMOS_KERNEL,
 989         PROJ_ILLUMOS_USER,
 990         PROJ_UNKNOWN,
 991 };
 992 extern enum project_type option_project;
 993 const char *check_name(unsigned short id);
 994 int id_from_name(const char *name);
 995 
 996 
 997 /* smatch_buf_size.c */
 998 int get_array_size(struct expression *expr);
 999 int get_array_size_bytes(struct expression *expr);
1000 int get_array_size_bytes_min(struct expression *expr);
1001 int get_array_size_bytes_max(struct expression *expr);
1002 struct range_list *get_array_size_bytes_rl(struct expression *expr);
1003 int get_real_array_size(struct expression *expr);
1004 int last_member_is_resizable(struct symbol *type);
1005 /* smatch_strlen.c */
1006 int get_implied_strlen(struct expression *expr, struct range_list **rl);
1007 int get_size_from_strlen(struct expression *expr);
1008 
1009 /* smatch_capped.c */
1010 int is_capped(struct expression *expr);
1011 int is_capped_var_sym(const char *name, struct symbol *sym);
1012 
1013 /* check_user_data.c */
1014 int is_user_macro(struct expression *expr);
1015 int is_user_data(struct expression *expr);
1016 int is_capped_user_data(struct expression *expr);
1017 int implied_user_data(struct expression *expr, struct range_list **rl);
1018 struct stree *get_user_stree(void);
1019 int get_user_rl(struct expression *expr, struct range_list **rl);
1020 int get_user_rl_spammy(struct expression *expr, struct range_list **rl);
1021 int is_user_rl(struct expression *expr);
1022 int get_user_rl_var_sym(const char *name, struct symbol *sym, struct range_list **rl);
1023 
1024 /* check_locking.c */
1025 void print_held_locks();
1026 
1027 /* check_assigned_expr.c */
1028 struct expression *get_assigned_expr(struct expression *expr);
1029 struct expression *get_assigned_expr_name_sym(const char *name, struct symbol *sym);
1030 /* smatch_return_to_param.c */
1031 void __add_return_to_param_mapping(struct expression *assign, const char *return_string);
1032 char *map_call_to_param_name_sym(struct expression *expr, struct symbol **sym);
1033 
1034 /* smatch_comparison.c */
1035 struct compare_data {
1036         /* The ->left and ->right expression pointers might be NULL (I'm lazy) */
1037         struct expression *left;
1038         const char *left_var;
1039         struct var_sym_list *left_vsl;
1040         int comparison;
1041         struct expression *right;
1042         const char *right_var;
1043         struct var_sym_list *right_vsl;
1044 };
1045 DECLARE_ALLOCATOR(compare_data);
1046 struct smatch_state *alloc_compare_state(
1047                 struct expression *left,
1048                 const char *left_var, struct var_sym_list *left_vsl,
1049                 int comparison,
1050                 struct expression *right,
1051                 const char *right_var, struct var_sym_list *right_vsl);
1052 int filter_comparison(int orig, int op);
1053 int merge_comparisons(int one, int two);
1054 int combine_comparisons(int left_compare, int right_compare);
1055 int state_to_comparison(struct smatch_state *state);
1056 struct smatch_state *merge_compare_states(struct smatch_state *s1, struct smatch_state *s2);
1057 int get_comparison(struct expression *left, struct expression *right);
1058 int get_comparison_strings(const char *one, const char *two);
1059 int possible_comparison(struct expression *a, int comparison, struct expression *b);
1060 struct state_list *get_all_comparisons(struct expression *expr);
1061 struct state_list *get_all_possible_equal_comparisons(struct expression *expr);
1062 void __add_return_comparison(struct expression *call, const char *range);
1063 void __add_comparison_info(struct expression *expr, struct expression *call, const char *range);
1064 char *get_printed_param_name(struct expression *call, const char *param_name, struct symbol *param_sym);
1065 char *name_sym_to_param_comparison(const char *name, struct symbol *sym);
1066 char *expr_equal_to_param(struct expression *expr, int ignore);
1067 char *expr_lte_to_param(struct expression *expr, int ignore);
1068 char *expr_param_comparison(struct expression *expr, int ignore);
1069 int flip_comparison(int op);
1070 int negate_comparison(int op);
1071 int remove_unsigned_from_comparison(int op);
1072 int param_compare_limit_is_impossible(struct expression *expr, int left_param, char *left_key, char *value);
1073 void filter_by_comparison(struct range_list **rl, int comparison, struct range_list *right);
1074 struct sm_state *comparison_implication_hook(struct expression *expr,
1075                         struct state_list **true_stack,
1076                         struct state_list **false_stack);
1077 void __compare_param_limit_hook(struct expression *left_expr, struct expression *right_expr,
1078                                 const char *state_name,
1079                                 struct smatch_state *true_state, struct smatch_state *false_state);
1080 int impossibly_high_comparison(struct expression *expr);
1081 
1082 /* smatch_sval.c */
1083 sval_t *sval_alloc(sval_t sval);
1084 sval_t *sval_alloc_permanent(sval_t sval);
1085 sval_t sval_blank(struct expression *expr);
1086 sval_t sval_type_val(struct symbol *type, long long val);
1087 sval_t sval_from_val(struct expression *expr, long long val);
1088 int sval_is_ptr(sval_t sval);
1089 int sval_unsigned(sval_t sval);
1090 int sval_signed(sval_t sval);
1091 int sval_bits(sval_t sval);
1092 int sval_bits_used(sval_t sval);
1093 int sval_is_negative(sval_t sval);
1094 int sval_is_positive(sval_t sval);
1095 int sval_is_min(sval_t sval);
1096 int sval_is_max(sval_t sval);
1097 int sval_is_a_min(sval_t sval);
1098 int sval_is_a_max(sval_t sval);
1099 int sval_is_negative_min(sval_t sval);
1100 int sval_cmp_t(struct symbol *type, sval_t one, sval_t two);
1101 int sval_cmp_val(sval_t one, long long val);
1102 sval_t sval_min(sval_t one, sval_t two);
1103 sval_t sval_max(sval_t one, sval_t two);
1104 int sval_too_low(struct symbol *type, sval_t sval);
1105 int sval_too_high(struct symbol *type, sval_t sval);
1106 int sval_fits(struct symbol *type, sval_t sval);
1107 sval_t sval_cast(struct symbol *type, sval_t sval);
1108 sval_t sval_preop(sval_t sval, int op);
1109 sval_t sval_binop(sval_t left, int op, sval_t right);
1110 int sval_binop_overflows(sval_t left, int op, sval_t right);
1111 int sval_binop_overflows_no_sign(sval_t left, int op, sval_t right);
1112 unsigned long long fls_mask(unsigned long long uvalue);
1113 unsigned long long sval_fls_mask(sval_t sval);
1114 const char *sval_to_str(sval_t sval);
1115 const char *sval_to_numstr(sval_t sval);
1116 sval_t ll_to_sval(long long val);
1117 
1118 /* smatch_string_list.c */
1119 int list_has_string(struct string_list *str_list, const char *str);
1120 void insert_string(struct string_list **str_list, const char *str);
1121 struct string_list *clone_str_list(struct string_list *orig);
1122 struct string_list *combine_string_lists(struct string_list *one, struct string_list *two);
1123 
1124 /* smatch_start_states.c */
1125 struct stree *get_start_states(void);
1126 
1127 /* smatch_recurse.c */
1128 int has_symbol(struct expression *expr, struct symbol *sym);
1129 int has_variable(struct expression *expr, struct expression *var);
1130 int has_inc_dec(struct expression *expr);
1131 
1132 /* smatch_stored_conditions.c */
1133 struct smatch_state *get_stored_condition(struct expression *expr);
1134 struct expression_list *get_conditions(struct expression *expr);
1135 struct sm_state *stored_condition_implication_hook(struct expression *expr,
1136                         struct state_list **true_stack,
1137                         struct state_list **false_stack);
1138 
1139 /* check_string_len.c */
1140 int get_formatted_string_size(struct expression *call, int arg);
1141 
1142 /* smatch_param_set.c */
1143 int param_was_set(struct expression *expr);
1144 int param_was_set_var_sym(const char *name, struct symbol *sym);
1145 /* smatch_param_filter.c */
1146 int param_has_filter_data(struct sm_state *sm);
1147 
1148 /* smatch_links.c */
1149 void set_up_link_functions(int id, int linkid);
1150 struct smatch_state *merge_link_states(struct smatch_state *s1, struct smatch_state *s2);
1151 void store_link(int link_id, const char *name, struct symbol *sym, const char *link_name, struct symbol *link_sym);
1152 
1153 /* smatch_auto_copy.c */
1154 void set_auto_copy(int owner);
1155 
1156 /* check_buf_comparison */
1157 struct expression *get_size_variable(struct expression *buf);
1158 struct expression *get_array_variable(struct expression *size);
1159 
1160 /* smatch_untracked_param.c */
1161 void mark_untracked(struct expression *expr, int param, const char *key, const char *value);
1162 void add_untracked_param_hook(void (func)(struct expression *call, int param));
1163 void mark_all_params_untracked(int return_id, char *return_ranges, struct expression *expr);
1164 
1165 /* smatch_strings.c */
1166 struct state_list *get_strings(struct expression *expr);
1167 struct expression *fake_string_from_mtag(mtag_t tag);
1168 
1169 /* smatch_estate.c */
1170 int estate_get_single_value(struct smatch_state *state, sval_t *sval);
1171 
1172 /* smatch_address.c */
1173 int get_address_rl(struct expression *expr, struct range_list **rl);
1174 int get_member_offset(struct symbol *type, const char *member_name);
1175 int get_member_offset_from_deref(struct expression *expr);
1176 
1177 /* for now this is in smatch_used_parameter.c */
1178 void __get_state_hook(int owner, const char *name, struct symbol *sym);
1179 
1180 /* smatch_buf_comparison.c */
1181 int db_var_is_array_limit(struct expression *array, const char *name, struct var_sym_list *vsl);
1182 
1183 struct stree *get_all_return_states(void);
1184 struct stree_stack *get_all_return_strees(void);
1185 int on_atomic_dec_path(void);
1186 int was_inced(const char *name, struct symbol *sym);
1187 
1188 /* smatch_constraints.c */
1189 char *get_constraint_str(struct expression *expr);
1190 struct constraint_list *get_constraints(struct expression *expr);
1191 char *unmet_constraint(struct expression *data, struct expression *offset);
1192 char *get_required_constraint(const char *data_str);
1193 
1194 /* smatch_container_of.c */
1195 int get_param_from_container_of(struct expression *expr);
1196 int get_offset_from_container_of(struct expression *expr);
1197 
1198 /* smatch_mtag.c */
1199 int get_string_mtag(struct expression *expr, mtag_t *tag);
1200 int get_toplevel_mtag(struct symbol *sym, mtag_t *tag);
1201 int get_mtag(struct expression *expr, mtag_t *tag);
1202 int get_mtag_offset(struct expression *expr, mtag_t *tag, int *offset);
1203 int create_mtag_alias(mtag_t tag, struct expression *expr, mtag_t *new);
1204 int expr_to_mtag_offset(struct expression *expr, mtag_t *tag, int *offset);
1205 void update_mtag_data(struct expression *expr);
1206 int get_mtag_sval(struct expression *expr, sval_t *sval);
1207 int get_mtag_addr_sval(struct expression *expr, sval_t *sval);
1208 
1209 /* Trinity fuzzer stuff */
1210 const char *get_syscall_arg_type(struct symbol *sym);
1211 
1212 /* smatch_mem_tracker.c */
1213 extern int option_mem;
1214 unsigned long get_max_memory(void);
1215 
1216 /* check_is_nospec.c */
1217 bool is_nospec(struct expression *expr);
1218 
1219 /* smatch_nul_terminator.c */
1220 bool is_nul_terminated(struct expression *expr);
1221 
1222 static inline int type_bits(struct symbol *type)
1223 {
1224         if (!type)
1225                 return 0;
1226         if (type->type == SYM_PTR)  /* Sparse doesn't set this for &pointers */
1227                 return bits_in_pointer;
1228         if (type->type == SYM_ARRAY)
1229                 return bits_in_pointer;
1230         if (!type->examined)
1231                 examine_symbol_type(type);
1232         return type->bit_size;
1233 }
1234 
1235 static inline bool type_is_ptr(struct symbol *type)
1236 {
1237         return type && (type->type == SYM_PTR || type->type == SYM_ARRAY);
1238 }
1239 
1240 static inline int type_unsigned(struct symbol *base_type)
1241 {
1242         if (!base_type)
1243                 return 0;
1244         if (base_type->ctype.modifiers & MOD_UNSIGNED)
1245                 return 1;
1246         return 0;
1247 }
1248 
1249 static inline int type_positive_bits(struct symbol *type)
1250 {
1251         if (!type)
1252                 return 0;
1253         if (type->type == SYM_ARRAY)
1254                 return bits_in_pointer - 1;
1255         if (type_unsigned(type))
1256                 return type_bits(type);
1257         return type_bits(type) - 1;
1258 }
1259 
1260 static inline int sval_positive_bits(sval_t sval)
1261 {
1262         return type_positive_bits(sval.type);
1263 }
1264 
1265 /*
1266  * Returns -1 if one is smaller, 0 if they are the same and 1 if two is larger.
1267  */
1268 static inline int sval_cmp(sval_t one, sval_t two)
1269 {
1270         struct symbol *type;
1271 
1272         type = one.type;
1273         if (sval_positive_bits(two) > sval_positive_bits(one))
1274                 type = two.type;
1275         if (type_bits(type) < 31)
1276                 type = &int_ctype;
1277 
1278         one = sval_cast(type, one);
1279         two = sval_cast(type, two);
1280 
1281         if (type_unsigned(type)) {
1282                 if (one.uvalue < two.uvalue)
1283                         return -1;
1284                 if (one.uvalue == two.uvalue)
1285                         return 0;
1286                 return 1;
1287         }
1288         /* fix me handle type promotion and unsigned values */
1289         if (one.value < two.value)
1290                 return -1;
1291         if (one.value == two.value)
1292                 return 0;
1293         return 1;
1294 }
1295 
1296 #endif      /* !SMATCH_H_ */