smatch.h

   1 /*
   2  * sparse/smatch.h
   3  *
   4  * Copyright (C) 2006 Dan Carpenter.
   5  *
   6  *  Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #ifndef         SMATCH_H_
  11 # define        SMATCH_H_
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <limits.h>
  16 #include "lib.h"
  17 #include "allocate.h"
  18 #include "parse.h"
  19 #include "expression.h"
  20
  21 struct smatch_state {
  22         const char *name;
  23         void *data;
  24 };
  25 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  26 extern struct smatch_state undefined;
  27 extern struct smatch_state merged;
  28 extern struct smatch_state true_state;
  29 extern struct smatch_state false_state;
  30 DECLARE_ALLOCATOR(smatch_state);
  31
  32 static inline void *INT_PTR(int i)
  33 {
  34         return (void *)(long)i;
  35 }
  36
  37 static inline int PTR_INT(void *p)
  38 {
  39         return (int)(long)p;
  40 }
  41
  42 struct sm_state {
  43         unsigned short owner;
  44         unsigned int merged:1;
  45         unsigned int implied:1;
  46         const char *name;
  47         struct symbol *sym;
  48         struct smatch_state *state;
  49         unsigned int line;
  50         struct state_list *my_pool;
  51         struct sm_state *left;
  52         struct sm_state *right;
  53         unsigned int nr_children;
  54         struct state_list *possible;
  55 };
  56
  57 struct tracker {
  58         int owner;
  59         char *name;
  60         struct symbol *sym;
  61 };
  62 DECLARE_ALLOCATOR(tracker);
  63 DECLARE_PTR_LIST(tracker_list, struct tracker);
  64
  65 enum hook_type {
  66         EXPR_HOOK,
  67         STMT_HOOK,
  68         SYM_HOOK,
  69         DECLARATION_HOOK,
  70         ASSIGNMENT_HOOK,
  71         CONDITION_HOOK,
  72         WHOLE_CONDITION_HOOK,
  73         FUNCTION_CALL_HOOK,
  74         CALL_ASSIGNMENT_HOOK,
  75         BINOP_HOOK,
  76         OP_HOOK,
  77         DEREF_HOOK,
  78         CASE_HOOK,
  79         BASE_HOOK,
  80         FUNC_DEF_HOOK,
  81         END_FUNC_HOOK,
  82         RETURN_HOOK,
  83         END_FILE_HOOK,
  84 };
  85
  86 #define TRUE 1
  87 #define FALSE 0
  88
  89 void add_hook(void *func, enum hook_type type);
  90 typedef struct smatch_state *(merge_func_t)(const char *name,
  91                                             struct symbol *sym,
  92                                             struct smatch_state *s1,
  93                                             struct smatch_state *s2);
  94 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
  95 void add_merge_hook(int client_id, merge_func_t *func);
  96 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
  97 typedef void (scope_hook)(void *data);
  98 void add_scope_hook(scope_hook *hook, void *data);
  99 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
 100 typedef void (implication_hook)(const char *fn, struct expression *call_expr,
 101                                 struct expression *assign_expr, void *data);
 102 void add_function_hook(const char *lock_for, func_hook *call_back, void *data);
 103
 104 void add_conditional_hook(const char *look_for, func_hook *call_back, void *data);
 105 void add_function_assign_hook(const char *look_for, func_hook *call_back,
 106                               void *info);
 107 void return_implies_state(const char *look_for, long long start, long long end,
 108                          implication_hook *call_back, void *info);
 109 typedef void (modification_hook)(const char *name, struct symbol *sym,
 110                                 struct expression *expr, void *data);
 111 void add_modification_hook(const char *variable, modification_hook *hook,
 112                         void *data);
 113 int is_member(struct expression *expr);
 114 void reset_on_container_modified(int owner, struct expression *expr);
 115 void set_default_state(int owner, struct smatch_state *state);
 116
 117 extern int final_pass;
 118
 119 #define sm_printf(msg...) do { if (final_pass) printf(msg); } while (0) \
 120
 121 #define sm_msg(msg...) \
 122 do {                                                           \
 123         if (!debug_states && !final_pass)                      \
 124                 break;                                         \
 125         printf("%s +%d %s(%d) ", get_filename(), get_lineno(), \
 126                get_function(), get_func_pos());                \
 127         printf(msg);                                           \
 128         printf("\n");                                          \
 129 } while (0)
 130
 131 #define sm_debug(msg...) do { if (debug_states) printf(msg); } while (0)
 132
 133 #define POINTER_MAX 0xffffffff
 134
 135 struct smatch_state *get_state(int owner, const char *name, struct symbol *sym);
 136 struct smatch_state *get_state_expr(int owner, struct expression *expr);
 137 struct state_list *get_possible_states(int owner, const char *name,
 138                                        struct symbol *sym);
 139 struct state_list *get_possible_states_expr(int owner, struct expression *expr);
 140 void set_state(int owner, const char *name, struct symbol *sym,
 141                struct smatch_state *state);
 142 void set_state_expr(int owner, struct expression *expr,
 143                 struct smatch_state *state);
 144 void delete_state(int owner, const char *name, struct symbol *sym);
 145 void delete_state_expr(int owner, struct expression *expr);
 146 void set_true_false_states(int owner, const char *name, struct symbol *sym,
 147                            struct smatch_state *true_state,
 148                            struct smatch_state *false_state);
 149 void set_true_false_states_expr(int owner, struct expression *expr,
 150                            struct smatch_state *true_state,
 151                            struct smatch_state *false_state);
 152
 153 struct state_list *get_all_states(int id);
 154 int is_reachable();
 155 char *get_filename();
 156 char *get_function();
 157 int get_lineno();
 158 int get_func_pos();
 159
 160 /* smatch_helper.c */
 161 char *alloc_string(const char *str);
 162 void free_string(char *str);
 163 struct expression *get_argument_from_call_expr(struct expression_list *args,
 164                                                int num);
 165 char *get_variable_from_expr_complex(struct expression *expr,
 166                                      struct symbol **sym_ptr);
 167 char *get_variable_from_expr(struct expression *expr,
 168                              struct symbol **sym_ptr);
 169 int sym_name_is(const char *name, struct expression *expr);
 170 int get_value(struct expression *expr, long long *val);
 171 int get_implied_value(struct expression *expr, long long *val);
 172 int is_zero(struct expression *expr);
 173 int is_array(struct expression *expr);
 174 struct expression *get_array_name(struct expression *expr);
 175 struct expression *get_array_offset(struct expression *expr);
 176 const char *show_state(struct smatch_state *state);
 177 struct statement *get_block_thing(struct expression *expr);
 178 struct expression *strip_expr(struct expression *expr);
 179 void scoped_state(int my_id, const char *name, struct symbol *sym);
 180 int is_error_return(struct expression *expr);
 181
 182 /* smatch_type.c */
 183 struct symbol *get_type(struct expression *expr);
 184
 185 /* smatch_ignore.c */
 186 void add_ignore(int owner, const char *name, struct symbol *sym);
 187 int is_ignored(int owner, const char *name, struct symbol *sym);
 188
 189 /* smatch_tracker */
 190 struct tracker *alloc_tracker(int owner, const char *name, struct symbol *sym);
 191 void add_tracker(struct tracker_list **list, int owner, const char *name,
 192                 struct symbol *sym);
 193 void del_tracker(struct tracker_list **list, int owner, const char *name,
 194                 struct symbol *sym);
 195 int in_tracker_list(struct tracker_list *list, int owner, const char *name,
 196                 struct symbol *sym);
 197 void free_tracker_list(struct tracker_list **list);
 198 void free_trackers_and_list(struct tracker_list **list);
 199
 200 /* smatch_conditions */
 201 int in_condition();
 202
 203 /* smatch_flow.c */
 204
 205 void smatch (int argc, char **argv);
 206 void __split_expr(struct expression *expr);
 207 void __split_statements(struct statement *stmt);
 208 extern int option_assume_loops;
 209 extern int option_known_conditions;
 210 extern int option_two_passes;
 211 extern struct symbol *cur_func_sym;
 212
 213 /* smatch_conditions */
 214 void __split_whole_condition(struct expression *expr);
 215
 216 /* smatch_implied.c */
 217 extern int debug_implied_states;
 218 extern int option_no_implied;
 219 void get_implications(char *name, struct symbol *sym, int comparison, int num,
 220                       struct state_list **true_states,
 221                       struct state_list **false_states);
 222 struct range_list_stack;
 223 struct state_list *__implied_case_slist(struct expression *switch_expr,
 224                                         struct expression *case_expr,
 225                                         struct range_list_stack **remaining_cases,
 226                                         struct state_list **raw_slist);
 227 struct range_list *__get_implied_values(struct expression *switch_expr);
 228
 229 /* smatch_extras.c */
 230 #define SMATCH_EXTRA 1 /* this is my_id from smatch extra set in smatch.c */
 231
 232 struct data_range {
 233         long long min;
 234         long long max;
 235 };
 236 extern struct data_range whole_range;
 237
 238 int get_implied_single_val(struct expression *expr, long long *val);
 239 int get_implied_max(struct expression *expr, long long *val);
 240 int get_implied_min(struct expression *expr, long long *val);
 241 int true_comparison(int left, int comparison, int right);
 242 int known_condition_true(struct expression *expr);
 243 int known_condition_false(struct expression *expr);
 244 int implied_condition_true(struct expression *expr);
 245 int implied_condition_false(struct expression *expr);
 246
 247 /* smatch_states.c */
 248 extern int debug_states;
 249
 250 extern int __fake_cur;
 251 extern struct state_list *__fake_cur_slist;
 252 extern int __fake_conditions;
 253 extern struct state_list *__fake_cond_true;
 254 extern struct state_list *__fake_cond_false;
 255
 256
 257 int unreachable();
 258 void __set_state(struct sm_state *sm);
 259 struct state_list *__get_cur_slist();
 260 void __set_true_false_sm(struct sm_state *true_state,
 261                         struct sm_state *false_state);
 262 void nullify_path();
 263 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 264                                void *unused);
 265 void __unnullify_path();
 266 int __path_is_null();
 267 void clear_all_states();
 268
 269 struct sm_state *get_sm_state(int owner, const char *name,
 270                                 struct symbol *sym);
 271 struct sm_state *get_sm_state_expr(int owner, struct expression *expr);
 272 void __use_false_only_stack();
 273 void __pop_false_only_stack();
 274 void __push_true_states();
 275 void __use_false_states();
 276 void __pop_false_states();
 277 void __merge_false_states();
 278 void __merge_true_states();
 279
 280 void __negate_cond_stacks();
 281 void __save_false_states_for_later();
 282 void __use_previously_stored_false_states();
 283 void __use_cond_true_states();
 284 void __use_cond_false_states();
 285 void __push_cond_stacks();
 286 void __and_cond_states();
 287 void __or_cond_states();
 288 void __save_pre_cond_states();
 289 void __pop_pre_cond_states();
 290 void __use_cond_states();
 291
 292 void __warn_on_silly_pre_loops();
 293
 294 void __push_continues();
 295 void __pop_continues();
 296 void __process_continues();
 297 void __merge_continues();
 298
 299 void __push_breaks();
 300 void __process_breaks();
 301 void __merge_breaks();
 302 void __use_breaks();
 303
 304 void __save_switch_states(struct expression *switch_expr);
 305 void __pop_switches();
 306 void __merge_switches(struct expression *switch_expr, struct expression *case_expr);
 307 void __push_default();
 308 void __set_default();
 309 int __pop_default();
 310
 311 void __push_conditions();
 312 void __pop_conditions();
 313
 314 void __save_gotos(const char *name);
 315 void __merge_gotos(const char *name);
 316
 317 void __print_cur_slist();
 318
 319 /* smatch_hooks.c */
 320 void __pass_to_client(void *data, enum hook_type type);
 321 void __pass_to_client_no_data(enum hook_type type);
 322 void __pass_case_to_client(struct expression *switch_expr,
 323                            struct expression *case_expr);
 324 int __has_merge_function(int client_id);
 325 struct smatch_state *__client_merge_function(int owner, const char *name,
 326                                              struct symbol *sym,
 327                                              struct smatch_state *s1,
 328                                              struct smatch_state *s2);
 329 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 330 void __push_scope_hooks(void);
 331 void __call_scope_hooks(void);
 332
 333 /* smatch_function_hooks.c */
 334 void create_function_hash(void);
 335 void __match_initializer_call(struct symbol *sym);
 336
 337 /* smatch_files.c */
 338 struct token *get_tokens_file(const char *filename);
 339
 340 /* smatch_oom.c */
 341 extern int option_oom_kb;
 342 int out_of_memory();
 343
 344 /* smatch.c */
 345 extern char *option_project_str;
 346 extern char *data_dir;
 347 extern int option_no_data;
 348 extern int option_spammy;
 349 extern int option_full_path;
 350 extern struct smatch_state *default_state[];
 351
 352 enum project_type {
 353         PROJ_NONE,
 354         PROJ_KERNEL,
 355         PROJ_WINE,
 356 };
 357 extern enum project_type option_project;
 358 const char *check_name(unsigned short id);
 359
 360 #endif      /* !SMATCH_H_ */