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         char *name;
  35         unsigned int owner;
  36         struct symbol *sym;
  37         struct smatch_state *state;
  38         struct state_list_stack *my_pools;
  39         struct state_list_stack *all_pools;
  40         struct state_list *possible;
  41 };
  42
  43 enum hook_type {
  44         EXPR_HOOK,
  45         STMT_HOOK,
  46         SYM_HOOK,
  47         DECLARATION_HOOK,
  48         ASSIGNMENT_HOOK,
  49         ASSIGNMENT_AFTER_HOOK,
  50         CONDITION_HOOK,
  51         WHOLE_CONDITION_HOOK,
  52         FUNCTION_CALL_HOOK,
  53         FUNCTION_CALL_AFTER_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 void add_merge_hook(int client_id, merge_func_t *func);
  68
  69 #define smatch_msg(msg...) \
  70 do {                                                          \
  71         printf("%s +%d %s(%d) ", get_filename(), get_lineno(), \
  72                get_function(), get_func_pos());               \
  73         printf(msg);                                          \
  74         printf("\n");                                         \
  75 } while (0)
  76
  77 #define SM_DEBUG(msg...) do { if (debug_states) printf(msg); } while (0)
  78
  79 #define UNDEFINED INT_MIN
  80
  81 struct smatch_state *get_state(const char *name, int owner, struct symbol *sym);
  82 struct state_list *get_possible_states(const char *name, int owner,
  83                                        struct symbol *sym);
  84 void set_state(const char *name, int owner, struct symbol *sym,
  85                struct smatch_state *state);
  86 void delete_state(const char *name, int owner, struct symbol *sym);
  87 void set_true_false_states(const char *name, int owner, struct symbol *sym,
  88                            struct smatch_state *true_state,
  89                            struct smatch_state *false_state);
  90
  91 struct state_list *get_all_states(int id);
  92 int is_reachable();
  93 char *get_filename();
  94 char *get_function();
  95 int get_lineno();
  96 int get_func_pos();
  97
  98 /* smatch_helper.c */
  99 char *alloc_string(const char *str);
 100 void free_string(char *str);
 101 struct expression *get_argument_from_call_expr(struct expression_list *args,
 102                                                int num);
 103 char *get_variable_from_expr_complex(struct expression *expr,
 104                                      struct symbol **sym_ptr);
 105 char *get_variable_from_expr(struct expression *expr,
 106                              struct symbol **sym_ptr);
 107 int sym_name_is(const char *name, struct expression *expr);
 108 int get_value(struct expression *expr);
 109 int is_zero(struct expression *expr);
 110 const char *show_state(struct smatch_state *state);
 111 struct statement *get_block_thing(struct expression *expr);
 112 struct expression *strip_expr(struct expression *expr);
 113
 114 /* smatch_ignore.c */
 115 struct tracker {
 116         char *name;
 117         int owner;
 118         struct symbol *sym;
 119 };
 120 DECLARE_PTR_LIST(tracker_list, struct tracker);
 121
 122 void add_ignore(const char *name, int owner, struct symbol *sym);
 123 int is_ignored(const char *name, int owner, struct symbol *sym);
 124
 125 /* smatch_tracker */
 126 void add_tracker(struct tracker_list **list, const char *name, int owner,
 127                 struct symbol *sym);
 128 int in_tracker_list(struct tracker_list *list, const char *name, int owner,
 129                 struct symbol *sym);
 130 void free_tracker_list(struct tracker_list **list);
 131 void free_trackers_and_list(struct tracker_list **list);
 132
 133 /* smatch_conditions */
 134 int in_condition();
 135
 136 /* ----------------------------------------------------------------
 137    The stuff below is all used internally and shouldn't
 138    be called from other programs
 139  -----------------------------------------------------------------*/
 140
 141 /* smatch_flow.c */
 142
 143 void smatch (int argc, char **argv);
 144 void __split_expr(struct expression *expr);
 145 void __split_statements(struct statement *stmt);
 146
 147 /* smatch_conditions */
 148 void __split_whole_condition(struct expression *expr);
 149
 150 /* smatch_implied.c */
 151 void __implied_states_hook(struct expression *expr);
 152
 153 /* smatch_extras.c */
 154 #define SMATCH_EXTRA 1 /* this is my_id from smatch extra set in smatch.c */
 155 int known_condition_true(struct expression *expr);
 156 int known_condition_false(struct expression *expr);
 157
 158 /* smatch_states.c */
 159 extern int debug_states;
 160
 161 struct state_list *__get_cur_slist();
 162 void __set_true_false_sm(struct sm_state *true_state,
 163                         struct sm_state *false_state);
 164 void nullify_path();
 165 void __unnullify_path();
 166 int __path_is_null();
 167 void clear_all_states();
 168
 169 struct sm_state *get_sm_state(const char *name, int owner,
 170                                 struct symbol *sym);
 171 void __use_false_only_stack();
 172 void __pop_false_only_stack();
 173 void __push_true_states();
 174 void __use_false_states();
 175 void __pop_false_states();
 176 void __merge_false_states();
 177 void __merge_true_states();
 178
 179 void __negate_cond_stacks();
 180 void __save_false_states_for_later();
 181 void __use_previously_stored_false_states();
 182 void __use_cond_true_states();
 183 void __use_cond_false_states();
 184 void __push_cond_stacks();
 185 void __and_cond_states();
 186 void __or_cond_states();
 187 void __save_pre_cond_states();
 188 void __pop_pre_cond_states();
 189 void __use_cond_states();
 190
 191 void __push_continues();
 192 void __pop_continues();
 193 void __process_continues();
 194 void __merge_continues();
 195
 196 void __push_breaks();
 197 void __process_breaks();
 198 void __merge_breaks();
 199 void __use_breaks();
 200
 201 void __save_switch_states();
 202 void __pop_switches();
 203 void __merge_switches();
 204 void __push_default();
 205 void __set_default();
 206 int __pop_default();
 207
 208 void __push_conditions();
 209 void __pop_conditions();
 210
 211 void __save_gotos(const char *name);
 212 void __merge_gotos(const char *name);
 213
 214 void __print_cur_slist();
 215
 216 /* smatch_hooks.c */
 217 void __pass_to_client(void *data, enum hook_type type);
 218 void __pass_to_client_no_data(enum hook_type type);
 219 void __pass_declarations_to_client(struct symbol_list *sym_list);
 220 int __has_merge_function(int client_id);
 221 struct smatch_state *__client_merge_function(int owner, const char *name, struct symbol *sym,
 222                             struct smatch_state *s1, struct smatch_state *s2);
 223
 224 #endif      /* !SMATCH_H_ */