1 /* 2 * Copyright (C) 2009 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 18 DECLARE_PTR_LIST(range_list, struct data_range); 19 DECLARE_PTR_LIST(range_list_stack, struct range_list); 20 21 struct relation { 22 char *name; 23 struct symbol *sym; 24 }; 25 26 DECLARE_PTR_LIST(related_list, struct relation); 27 28 struct data_info { 29 struct related_list *related; 30 struct range_list *value_ranges; 31 sval_t fuzzy_max; 32 unsigned int hard_max:1; 33 unsigned int capped:1; 34 }; 35 DECLARE_ALLOCATOR(data_info); 36 37 extern struct string_list *__ignored_macros; 38 39 /* these are implemented in smatch_ranges.c */ 40 struct range_list *rl_zero(void); 41 struct range_list *rl_one(void); 42 char *show_rl(struct range_list *list); 43 int str_to_comparison_arg(const char *c, struct expression *call, int *comparison, struct expression **arg); 44 void str_to_rl(struct symbol *type, char *value, struct range_list **rl); 45 void call_results_to_rl(struct expression *call, struct symbol *type, const char *value, struct range_list **rl); 46 47 struct data_range *alloc_range(sval_t min, sval_t max); 48 struct data_range *alloc_range_perm(sval_t min, sval_t max); 49 50 int rl_fits_in_type(struct range_list *rl, struct symbol *type); 51 52 struct range_list *alloc_rl(sval_t min, sval_t max); 53 struct range_list *clone_rl(struct range_list *list); 54 struct range_list *clone_rl_permanent(struct range_list *list); 55 struct range_list *alloc_whole_rl(struct symbol *type); 56 57 void add_range(struct range_list **list, sval_t min, sval_t max); 58 struct range_list *remove_range(struct range_list *list, sval_t min, sval_t max); 59 void tack_on(struct range_list **list, struct data_range *drange); 60 61 int true_comparison_range(struct data_range *left, int comparison, struct data_range *right); 62 int true_comparison_range_LR(int comparison, struct data_range *var, struct data_range *val, int left); 63 int false_comparison_range_LR(int comparison, struct data_range *var, struct data_range *val, int left); 64 65 int possibly_true(struct expression *left, int comparison, struct expression *right); 66 int possibly_true_rl(struct range_list *left_ranges, int comparison, struct range_list *right_ranges); 67 int possibly_true_rl_LR(int comparison, struct range_list *a, struct range_list *b, int left); 68 69 int possibly_false(struct expression *left, int comparison, struct expression *right); 70 int possibly_false_rl(struct range_list *left_ranges, int comparison, struct range_list *right_ranges); 71 int possibly_false_rl_LR(int comparison, struct range_list *a, struct range_list *b, int left); 72 73 int rl_has_sval(struct range_list *rl, sval_t sval); 74 int ranges_equiv(struct data_range *one, struct data_range *two); 75 76 int rl_equiv(struct range_list *one, struct range_list *two); 77 int is_whole_rl(struct range_list *rl); 78 int is_unknown_ptr(struct range_list *rl); 79 int is_whole_rl_non_zero(struct range_list *rl); 80 int estate_is_unknown(struct smatch_state *state); 81 82 sval_t rl_min(struct range_list *rl); 83 sval_t rl_max(struct range_list *rl); 84 int rl_to_sval(struct range_list *rl, sval_t *sval); 85 struct symbol *rl_type(struct range_list *rl); 86 87 struct range_list *rl_filter(struct range_list *rl, struct range_list *filter); 88 struct range_list *rl_intersection(struct range_list *one, struct range_list *two); 89 struct range_list *rl_union(struct range_list *one, struct range_list *two); 90 struct range_list *rl_binop(struct range_list *left, int op, struct range_list *right); 91 92 void push_rl(struct range_list_stack **rl_stack, struct range_list *rl); 93 struct range_list *pop_rl(struct range_list_stack **rl_stack); 94 struct range_list *top_rl(struct range_list_stack *rl_stack); 95 void filter_top_rl(struct range_list_stack **rl_stack, struct range_list *filter); 96 97 struct range_list *rl_truncate_cast(struct symbol *type, struct range_list *rl); 98 struct range_list *cast_rl(struct symbol *type, struct range_list *rl); 99 int get_implied_rl(struct expression *expr, struct range_list **rl); 100 int get_absolute_rl(struct expression *expr, struct range_list **rl); 101 int get_real_absolute_rl(struct expression *expr, struct range_list **rl); 102 struct range_list *var_to_absolute_rl(struct expression *expr); 103 int custom_get_absolute_rl(struct expression *expr, 104 struct range_list *(*fn)(struct expression *expr), 105 struct range_list **rl); 106 int get_implied_rl_var_sym(const char *var, struct symbol *sym, struct range_list **rl); 107 void split_comparison_rl(struct range_list *left_orig, int op, struct range_list *right_orig, 108 struct range_list **left_true_rl, struct range_list **left_false_rl, 109 struct range_list **right_true_rl, struct range_list **right_false_rl); 110 111 void free_data_info_allocs(void); 112 void free_all_rl(void); 113 114 /* smatch_estate.c */ 115 116 struct smatch_state *alloc_estate_empty(void); 117 struct smatch_state *alloc_estate_sval(sval_t sval); 118 struct smatch_state *alloc_estate_range(sval_t min, sval_t max); 119 struct smatch_state *alloc_estate_rl(struct range_list *rl); 120 struct smatch_state *alloc_estate_whole(struct symbol *type); 121 struct smatch_state *clone_estate(struct smatch_state *state); 122 struct smatch_state *clone_estate_cast(struct symbol *type, struct smatch_state *state); 123 struct smatch_state *clone_partial_estate(struct smatch_state *state, struct range_list *rl); 124 125 struct smatch_state *merge_estates(struct smatch_state *s1, struct smatch_state *s2); 126 127 int estates_equiv(struct smatch_state *one, struct smatch_state *two); 128 int estate_is_whole(struct smatch_state *state); 129 int estate_is_empty(struct smatch_state *state); 130 131 struct range_list *estate_rl(struct smatch_state *state); 132 struct related_list *estate_related(struct smatch_state *state); 133 134 sval_t estate_min(struct smatch_state *state); 135 sval_t estate_max(struct smatch_state *state); 136 struct symbol *estate_type(struct smatch_state *state); 137 138 int estate_has_fuzzy_max(struct smatch_state *state); 139 sval_t estate_get_fuzzy_max(struct smatch_state *state); 140 void estate_set_fuzzy_max(struct smatch_state *state, sval_t max); 141 void estate_copy_fuzzy_max(struct smatch_state *new, struct smatch_state *old); 142 void estate_clear_fuzzy_max(struct smatch_state *state); 143 int estate_has_hard_max(struct smatch_state *state); 144 void estate_set_hard_max(struct smatch_state *state); 145 void estate_clear_hard_max(struct smatch_state *state); 146 int estate_get_hard_max(struct smatch_state *state, sval_t *sval); 147 bool estate_capped(struct smatch_state *state); 148 void estate_set_capped(struct smatch_state *state); 149 150 int estate_get_single_value(struct smatch_state *state, sval_t *sval); 151 struct smatch_state *get_implied_estate(struct expression *expr); 152 153 struct smatch_state *estate_filter_sval(struct smatch_state *orig, sval_t filter); 154 struct data_info *clone_dinfo_perm(struct data_info *dinfo); 155 struct smatch_state *clone_estate_perm(struct smatch_state *state); 156 157 /* smatch_extra.c */ 158 bool is_impossible_variable(struct expression *expr); 159 struct sm_state *get_extra_sm_state(struct expression *expr); 160 struct smatch_state *get_extra_state(struct expression *expr); 161 void call_extra_mod_hooks(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state); 162 void set_extra_mod(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state); 163 void set_extra_expr_mod(struct expression *expr, struct smatch_state *state); 164 void set_extra_nomod(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state); 165 void set_extra_nomod_vsl(const char *name, struct symbol *sym, struct var_sym_list *vsl, struct expression *expr, struct smatch_state *state); 166 void set_extra_expr_nomod(struct expression *expr, struct smatch_state *state); 167 void set_extra_mod_helper(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state); 168 169 struct data_info *get_dinfo(struct smatch_state *state); 170 171 void add_extra_mod_hook(void (*fn)(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state)); 172 void add_extra_nomod_hook(void (*fn)(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state)); 173 int implied_not_equal(struct expression *expr, long long val); 174 int implied_not_equal_name_sym(char *name, struct symbol *sym, long long val); 175 int parent_is_null_var_sym(const char *name, struct symbol *sym); 176 int parent_is_null(struct expression *expr); 177 int parent_is_free_var_sym_strict(const char *name, struct symbol *sym); 178 int parent_is_free_var_sym(const char *name, struct symbol *sym); 179 int parent_is_free(struct expression *expr); 180 181 struct sm_state *__extra_handle_canonical_loops(struct statement *loop, struct stree **stree); 182 int __iterator_unchanged(struct sm_state *sm); 183 void __extra_pre_loop_hook_after(struct sm_state *sm, 184 struct statement *iterator, 185 struct expression *condition); 186 187 /* smatch_equiv.c */ 188 void set_equiv(struct expression *left, struct expression *right); 189 void set_related(struct smatch_state *estate, struct related_list *rlist); 190 struct related_list *get_shared_relations(struct related_list *one, 191 struct related_list *two); 192 struct related_list *clone_related_list(struct related_list *related); 193 void remove_from_equiv(const char *name, struct symbol *sym); 194 void remove_from_equiv_expr(struct expression *expr); 195 void set_equiv_state_expr(int id, struct expression *expr, struct smatch_state *state); 196 197 /* smatch_function_hooks.c */ 198 void function_comparison(struct expression *left, int comparison, struct expression *right); 199 200 /* smatch_expressions.c */ 201 struct expression *zero_expr(); 202 struct expression *value_expr(long long val); 203 struct expression *member_expression(struct expression *deref, int op, struct ident *member); 204 struct expression *preop_expression(struct expression *expr, int op); 205 struct expression *deref_expression(struct expression *expr); 206 struct expression *assign_expression(struct expression *left, int op, struct expression *right); 207 struct expression *binop_expression(struct expression *left, int op, struct expression *right); 208 struct expression *array_element_expression(struct expression *array, struct expression *offset); 209 struct expression *symbol_expression(struct symbol *sym); 210 struct expression *string_expression(char *str); 211 struct expression *compare_expression(struct expression *left, int op, struct expression *right); 212 struct expression *unknown_value_expression(struct expression *expr); 213 int is_fake_call(struct expression *expr); 214 struct expression *gen_expression_from_key(struct expression *arg, const char *key); 215 void free_tmp_expressions(void); 216 void expr_set_parent_expr(struct expression *expr, struct expression *parent); 217 void expr_set_parent_stmt(struct expression *expr, struct statement *parent); 218 struct expression *expr_get_parent_expr(struct expression *expr); 219 struct statement *expr_get_parent_stmt(struct expression *expr); 220 221 /* smatch_param_limit.c */ 222 struct smatch_state *get_orig_estate(const char *name, struct symbol *sym); 223 224 /* smatch_real_absolute.c */ 225 struct smatch_state *get_real_absolute_state(struct expression *expr); 226 struct smatch_state *get_real_absolute_state_var_sym(const char *name, struct symbol *sym); 227 228 /* smatch_imaginary_absolute.c */ 229 void __save_imaginary_state(struct expression *expr, struct range_list *true_rl, struct range_list *false_rl); 230 int get_imaginary_absolute(struct expression *expr, struct range_list **rl); 231 232