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