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 #define KERNEL
  22 #define MAXSMSTATES 1000000 /* Limits RAM use.  Give up on big functions */
  23 struct smatch_state {
  24         const char *name;
  25         void *data;
  26 };
  27 #define STATE(_x) static struct smatch_state _x = { .name = #_x }
  28 extern struct smatch_state undefined;
  29 extern struct smatch_state merged;
  30 extern struct smatch_state true_state;
  31 extern struct smatch_state false_state;
  32 DECLARE_ALLOCATOR(smatch_state);
  33
  34 static inline void *INT_PTR(int i)
  35 {
  36         return (void *)(long)i;
  37 }
  38
  39 static inline int PTR_INT(void *p)
  40 {
  41         return (int)(long)p;
  42 }
  43
  44 struct sm_state {
  45         const char *name;
  46         unsigned int owner;
  47         struct symbol *sym;
  48         struct smatch_state *state;
  49         int line;
  50         struct state_list_stack *my_pools;
  51         struct state_list_stack *all_pools;
  52         struct state_list *possible;
  53 };
  54
  55 enum hook_type {
  56         EXPR_HOOK,
  57         STMT_HOOK,
  58         SYM_HOOK,
  59         DECLARATION_HOOK,
  60         ASSIGNMENT_HOOK,
  61         CONDITION_HOOK,
  62         WHOLE_CONDITION_HOOK,
  63         FUNCTION_CALL_HOOK,
  64         CALL_ASSIGNMENT_HOOK,
  65         OP_HOOK,
  66         DEREF_HOOK,
  67         CASE_HOOK,
  68         BASE_HOOK,
  69         FUNC_DEF_HOOK,
  70         END_FUNC_HOOK,
  71         RETURN_HOOK,
  72         END_FILE_HOOK,
  73 };
  74 void add_hook(void *func, enum hook_type type);
  75 typedef struct smatch_state *(merge_func_t)(const char *name,
  76                                             struct symbol *sym,
  77                                             struct smatch_state *s1,
  78                                             struct smatch_state *s2);
  79 typedef struct smatch_state *(unmatched_func_t)(struct sm_state *state);
  80 void add_merge_hook(int client_id, merge_func_t *func);
  81 void add_unmatched_state_hook(int client_id, unmatched_func_t *func);
  82 typedef void (func_hook)(const char *fn, struct expression *expr, void *data);
  83 void add_function_hook(const char *lock_for, func_hook *call_back, void *data);
  84
  85 void add_conditional_hook(const char *look_for, func_hook *call_back, void *data);
  86 void add_function_assign_hook(const char *look_for, func_hook *call_back,
  87                               void *info);
  88
  89 #define smatch_msg(msg...) \
  90 do {                                                          \
  91         printf("%s +%d %s(%d) ", get_filename(), get_lineno(), \
  92                get_function(), get_func_pos());               \
  93         printf(msg);                                          \
  94         printf("\n");                                         \
  95 } while (0)
  96
  97 #define SM_DEBUG(msg...) do { if (debug_states) printf(msg); } while (0)
  98 #define DIMPLIED(msg...) do { if (debug_implied_states) printf(msg); } while (0)
  99
 100 #define UNDEFINED INT_MIN
 101
 102 struct smatch_state *get_state(const char *name, int owner, struct symbol *sym);
 103 struct state_list *get_possible_states(const char *name, int owner,
 104                                        struct symbol *sym);
 105 void set_state(const char *name, int owner, struct symbol *sym,
 106                struct smatch_state *state);
 107 void delete_state(const char *name, int owner, struct symbol *sym);
 108 void set_true_false_states(const char *name, int owner, struct symbol *sym,
 109                            struct smatch_state *true_state,
 110                            struct smatch_state *false_state);
 111
 112 struct state_list *get_all_states(int id);
 113 int is_reachable();
 114 char *get_filename();
 115 char *get_function();
 116 int get_lineno();
 117 int get_func_pos();
 118
 119 /* smatch_helper.c */
 120 char *alloc_string(const char *str);
 121 void free_string(char *str);
 122 struct expression *get_argument_from_call_expr(struct expression_list *args,
 123                                                int num);
 124 char *get_variable_from_expr_complex(struct expression *expr,
 125                                      struct symbol **sym_ptr);
 126 char *get_variable_from_expr(struct expression *expr,
 127                              struct symbol **sym_ptr);
 128 struct symbol *get_ptr_type(struct expression *expr);
 129 int sym_name_is(const char *name, struct expression *expr);
 130 int get_value(struct expression *expr);
 131 int is_zero(struct expression *expr);
 132 const char *show_state(struct smatch_state *state);
 133 struct statement *get_block_thing(struct expression *expr);
 134 struct expression *strip_expr(struct expression *expr);
 135
 136 /* smatch_ignore.c */
 137 struct tracker {
 138         char *name;
 139         int owner;
 140         struct symbol *sym;
 141 };
 142 DECLARE_PTR_LIST(tracker_list, struct tracker);
 143
 144 void add_ignore(const char *name, int owner, struct symbol *sym);
 145 int is_ignored(const char *name, int owner, struct symbol *sym);
 146
 147 /* smatch_tracker */
 148 void add_tracker(struct tracker_list **list, const char *name, int owner,
 149                 struct symbol *sym);
 150 void del_tracker(struct tracker_list **list, const char *name, int owner,
 151                 struct symbol *sym);
 152 int in_tracker_list(struct tracker_list *list, const char *name, int owner,
 153                 struct symbol *sym);
 154 void free_tracker_list(struct tracker_list **list);
 155 void free_trackers_and_list(struct tracker_list **list);
 156
 157 /* smatch_conditions */
 158 int in_condition();
 159
 160 /* ----------------------------------------------------------------
 161    The stuff below is all used internally and shouldn't
 162    be called from other programs
 163  -----------------------------------------------------------------*/
 164
 165 /* smatch_flow.c */
 166
 167 void smatch (int argc, char **argv);
 168 void __split_expr(struct expression *expr);
 169 void __split_statements(struct statement *stmt);
 170 extern int option_assume_loops;
 171 extern int option_known_conditions;
 172
 173 /* smatch_conditions */
 174 void __split_whole_condition(struct expression *expr);
 175
 176 /* smatch_implied.c */
 177 extern int debug_implied_states;
 178 extern int option_no_implied;
 179 void get_implications(char *name, struct symbol *sym, int comparison, int num,
 180                       struct state_list **true_states,
 181                       struct state_list **false_states);
 182
 183 /* smatch_extras.c */
 184 #define SMATCH_EXTRA 1 /* this is my_id from smatch extra set in smatch.c */
 185 int get_implied_value(struct expression *expr);
 186 int true_comparison(int left, int comparison, int right);
 187 int known_condition_true(struct expression *expr);
 188 int known_condition_false(struct expression *expr);
 189 int implied_condition_true(struct expression *expr);
 190 int implied_condition_false(struct expression *expr);
 191
 192 /* smatch_states.c */
 193 extern int debug_states;
 194 extern int __fake_conditions;
 195 extern struct state_list *__fake_cond_true;
 196 extern struct state_list *__fake_cond_false;
 197
 198
 199 void __set_state(struct sm_state *sm);
 200 struct state_list *__get_cur_slist();
 201 void __set_true_false_sm(struct sm_state *true_state,
 202                         struct sm_state *false_state);
 203 void nullify_path();
 204 void __match_nullify_path_hook(const char *fn, struct expression *expr,
 205                                void *unused);
 206 void __unnullify_path();
 207 int __path_is_null();
 208 void clear_all_states();
 209
 210 struct sm_state *get_sm_state(const char *name, int owner,
 211                                 struct symbol *sym);
 212 void __use_false_only_stack();
 213 void __pop_false_only_stack();
 214 void __push_true_states();
 215 void __use_false_states();
 216 void __pop_false_states();
 217 void __merge_false_states();
 218 void __merge_true_states();
 219
 220 void __negate_cond_stacks();
 221 void __save_false_states_for_later();
 222 void __use_previously_stored_false_states();
 223 void __use_cond_true_states();
 224 void __use_cond_false_states();
 225 void __push_cond_stacks();
 226 void __and_cond_states();
 227 void __or_cond_states();
 228 void __save_pre_cond_states();
 229 void __pop_pre_cond_states();
 230 void __use_cond_states();
 231
 232 void __warn_on_silly_pre_loops();
 233
 234 void __push_continues();
 235 void __pop_continues();
 236 void __process_continues();
 237 void __merge_continues();
 238
 239 void __push_breaks();
 240 void __process_breaks();
 241 void __merge_breaks();
 242 void __use_breaks();
 243
 244 void __save_switch_states();
 245 void __pop_switches();
 246 void __merge_switches();
 247 void __push_default();
 248 void __set_default();
 249 int __pop_default();
 250
 251 void __push_conditions();
 252 void __pop_conditions();
 253
 254 void __save_gotos(const char *name);
 255 void __merge_gotos(const char *name);
 256
 257 void __print_cur_slist();
 258
 259 /* smatch_hooks.c */
 260 void __pass_to_client(void *data, enum hook_type type);
 261 void __pass_to_client_no_data(enum hook_type type);
 262 void __pass_case_to_client(struct expression *switch_expr,
 263                            struct expression *case_expr);
 264 int __has_merge_function(int client_id);
 265 struct smatch_state *__client_merge_function(int owner, const char *name,
 266                                              struct symbol *sym,
 267                                              struct smatch_state *s1,
 268                                              struct smatch_state *s2);
 269 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm);
 270
 271 /* smatch_function_hooks.c */
 272 struct fcall_back {
 273         int type;
 274         func_hook *call_back;
 275         void *info;
 276 };
 277 DECLARE_ALLOCATOR(fcall_back);
 278 DECLARE_PTR_LIST(call_back_list, struct fcall_back);
 279 void create_function_hash(void);
 280 void __match_initializer_call(struct symbol *sym);
 281
 282 /* smatch_files.c */
 283 struct token *get_tokens_file(const char *filename);
 284
 285 /* smatch.c */
 286 extern char *data_dir;
 287 extern int option_no_data;
 288
 289 #endif      /* !SMATCH_H_ */