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