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1 : : /* Finding reachable regions and values.
2 : : Copyright (C) 2020-2024 Free Software Foundation, Inc.
3 : : Contributed by David Malcolm <dmalcolm@redhat.com>.
4 : :
5 : : This file is part of GCC.
6 : :
7 : : GCC is free software; you can redistribute it and/or modify it
8 : : under the terms of the GNU General Public License as published by
9 : : the Free Software Foundation; either version 3, or (at your option)
10 : : any later version.
11 : :
12 : : GCC is distributed in the hope that it will be useful, but
13 : : WITHOUT ANY WARRANTY; without even the implied warranty of
14 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 : : General Public License for more details.
16 : :
17 : : You should have received a copy of the GNU General Public License
18 : : along with GCC; see the file COPYING3. If not see
19 : : <http://www.gnu.org/licenses/>. */
20 : :
21 : : #ifndef GCC_ANALYZER_REGION_MODEL_REACHABILITY_H
22 : : #define GCC_ANALYZER_REGION_MODEL_REACHABILITY_H
23 : :
24 : : namespace ana {
25 : :
26 : : /* A class for determining which regions and svalues are reachable.
27 : :
28 : : Used by region_model::handle_unrecognized_call for keeping
29 : : track of all regions that are reachable, and, of those, which are
30 : : mutable.
31 : :
32 : : Used by program_state::detect_leaks
33 : : (via region_model::get_reachable_svalues) for detecting leaks. */
34 : :
35 : : class reachable_regions
36 : : {
37 : : public:
38 : : reachable_regions (region_model *model);
39 : :
40 : : /* Callback called for each cluster when initializing this object. */
41 : : static void init_cluster_cb (const region *base_reg,
42 : : reachable_regions *this_ptr);
43 : :
44 : : /* Called for each cluster when initializing this object. */
45 : : void init_cluster (const region *base_reg);
46 : :
47 : : /* Lazily mark the cluster containing REG as being reachable, recursively
48 : : adding clusters reachable from REG's cluster. */
49 : : void add (const region *reg, bool is_mutable);
50 : :
51 : : static void handle_sval_cb (const svalue *sval,
52 : : reachable_regions *this_ptr);
53 : :
54 : : /* Add SVAL. If it is a pointer, add the pointed-to region. */
55 : : void handle_sval (const svalue *sval);
56 : :
57 : : /* Add SVAL. If it is a pointer, add the pointed-to region.
58 : : Use PARAM_TYPE for determining mutability. */
59 : : void handle_parm (const svalue *sval, tree param_type);
60 : :
61 : : /* Update the store to mark the clusters that were found to be mutable
62 : : as having escaped.
63 : : Notify CTXT about escaping function_decls. */
64 : : void mark_escaped_clusters (region_model_context *ctxt);
65 : :
66 : : /* Iteration over reachable base regions. */
67 : 18889 : hash_set<const region *>::iterator begin ()
68 : : {
69 : 18889 : return m_reachable_base_regs.begin ();
70 : : }
71 : 18889 : hash_set<const region *>::iterator end ()
72 : : {
73 : 18889 : return m_reachable_base_regs.end ();
74 : : }
75 : :
76 : 1396389 : svalue_set::iterator begin_reachable_svals ()
77 : : {
78 : 1396389 : return m_reachable_svals.begin ();
79 : : }
80 : 8702393 : svalue_set::iterator end_reachable_svals ()
81 : : {
82 : 8702393 : return m_reachable_svals.end ();
83 : : }
84 : 22001 : svalue_set::iterator begin_mutable_svals ()
85 : : {
86 : 22001 : return m_mutable_svals.begin ();
87 : : }
88 : 77367 : svalue_set::iterator end_mutable_svals ()
89 : : {
90 : 77367 : return m_mutable_svals.end ();
91 : : }
92 : 22413 : hash_set<const region *>::iterator begin_mutable_base_regs ()
93 : : {
94 : 22413 : return m_mutable_base_regs.begin ();
95 : : }
96 : 60918 : hash_set<const region *>::iterator end_mutable_base_regs ()
97 : : {
98 : 60918 : return m_mutable_base_regs.end ();
99 : : }
100 : :
101 : : void dump_to_pp (pretty_printer *pp) const;
102 : :
103 : : DEBUG_FUNCTION void dump () const;
104 : :
105 : : private:
106 : : region_model *m_model;
107 : : store *m_store;
108 : :
109 : : /* The base regions already seen. */
110 : : hash_set<const region *> m_reachable_base_regs;
111 : :
112 : : /* The base regions that can be changed (accessed via non-const pointers). */
113 : : hash_set<const region *> m_mutable_base_regs;
114 : :
115 : : /* svalues that were passed as const pointers, so e.g. couldn't have
116 : : been freed (but could have e.g. had "close" called on them if an
117 : : int file-descriptor). */
118 : : svalue_set m_reachable_svals;
119 : : /* svalues that were passed as non-const pointers, so e.g. could have
120 : : been freed. */
121 : : svalue_set m_mutable_svals;
122 : : };
123 : :
124 : : } // namespace ana
125 : :
126 : : #endif /* GCC_ANALYZER_REGION_MODEL_REACHABILITY_H */
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