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/* Finding reachable regions and values.
Copyright (C) 2020-2022 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_ANALYZER_REGION_MODEL_REACHABILITY_H
#define GCC_ANALYZER_REGION_MODEL_REACHABILITY_H
namespace ana {
/* A class for determining which regions and svalues are reachable.
Used by region_model::handle_unrecognized_call for keeping
track of all regions that are reachable, and, of those, which are
mutable.
Used by program_state::detect_leaks
(via region_model::get_reachable_svalues) for detecting leaks. */
class reachable_regions
{
public:
reachable_regions (region_model *model);
/* Callback called for each cluster when initializing this object. */
static void init_cluster_cb (const region *base_reg,
reachable_regions *this_ptr);
/* Called for each cluster when initializing this object. */
void init_cluster (const region *base_reg);
/* Lazily mark the cluster containing REG as being reachable, recursively
adding clusters reachable from REG's cluster. */
void add (const region *reg, bool is_mutable);
static void handle_sval_cb (const svalue *sval,
reachable_regions *this_ptr);
/* Add SVAL. If it is a pointer, add the pointed-to region. */
void handle_sval (const svalue *sval);
/* Add SVAL. If it is a pointer, add the pointed-to region.
Use PARAM_TYPE for determining mutability. */
void handle_parm (const svalue *sval, tree param_type);
/* Update the store to mark the clusters that were found to be mutable
as having escaped.
Notify CTXT about escaping function_decls. */
void mark_escaped_clusters (region_model_context *ctxt);
/* Iteration over reachable base regions. */
hash_set<const region *>::iterator begin ()
{
return m_reachable_base_regs.begin ();
}
hash_set<const region *>::iterator end ()
{
return m_reachable_base_regs.end ();
}
svalue_set::iterator begin_reachable_svals ()
{
return m_reachable_svals.begin ();
}
svalue_set::iterator end_reachable_svals ()
{
return m_reachable_svals.end ();
}
svalue_set::iterator begin_mutable_svals ()
{
return m_mutable_svals.begin ();
}
svalue_set::iterator end_mutable_svals ()
{
return m_mutable_svals.end ();
}
hash_set<const region *>::iterator begin_mutable_base_regs ()
{
return m_mutable_base_regs.begin ();
}
hash_set<const region *>::iterator end_mutable_base_regs ()
{
return m_mutable_base_regs.end ();
}
void dump_to_pp (pretty_printer *pp) const;
DEBUG_FUNCTION void dump () const;
private:
region_model *m_model;
store *m_store;
/* The base regions already seen. */
hash_set<const region *> m_reachable_base_regs;
/* The base regions that can be changed (accessed via non-const pointers). */
hash_set<const region *> m_mutable_base_regs;
/* svalues that were passed as const pointers, so e.g. couldn't have
been freed (but could have e.g. had "close" called on them if an
int file-descriptor). */
svalue_set m_reachable_svals;
/* svalues that were passed as non-const pointers, so e.g. could have
been freed. */
svalue_set m_mutable_svals;
};
} // namespace ana
#endif /* GCC_ANALYZER_REGION_MODEL_REACHABILITY_H */
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