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/* Modeling API uses and misuses via state machines.
Copyright (C) 2019-2023 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/>. */
#include "config.h"
#define INCLUDE_MEMORY
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "function.h"
#include "basic-block.h"
#include "gimple.h"
#include "options.h"
#include "function.h"
#include "diagnostic-core.h"
#include "pretty-print.h"
#include "diagnostic.h"
#include "tree-diagnostic.h"
#include "analyzer/analyzer.h"
#include "analyzer/analyzer-logging.h"
#include "analyzer/sm.h"
#include "analyzer/call-string.h"
#include "analyzer/program-point.h"
#include "analyzer/store.h"
#include "analyzer/svalue.h"
#include "analyzer/program-state.h"
#include "analyzer/pending-diagnostic.h"
#if ENABLE_ANALYZER
namespace ana {
/* Return true if VAR has pointer or reference type. */
bool
any_pointer_p (tree var)
{
return POINTER_TYPE_P (TREE_TYPE (var));
}
/* Return true if SVAL has pointer or reference type. */
bool
any_pointer_p (const svalue *sval)
{
if (!sval->get_type ())
return false;
return POINTER_TYPE_P (sval->get_type ());
}
/* class state_machine::state. */
/* Base implementation of dump_to_pp vfunc. */
void
state_machine::state::dump_to_pp (pretty_printer *pp) const
{
pp_string (pp, m_name);
}
/* Return a new json::string describing the state. */
json::value *
state_machine::state::to_json () const
{
pretty_printer pp;
pp_format_decoder (&pp) = default_tree_printer;
dump_to_pp (&pp);
return new json::string (pp_formatted_text (&pp));
}
/* class state_machine. */
/* state_machine's ctor. */
state_machine::state_machine (const char *name, logger *logger)
: log_user (logger), m_name (name), m_next_state_id (0),
m_start (add_state ("start"))
{
}
/* Add a state with name NAME to this state_machine.
The string is required to outlive the state_machine.
Return the state_t for the new state. */
state_machine::state_t
state_machine::add_state (const char *name)
{
state *s = new state (name, alloc_state_id ());
m_states.safe_push (s);
return s;
}
/* Get the state with name NAME, which must exist.
This is purely intended for use in selftests. */
state_machine::state_t
state_machine::get_state_by_name (const char *name) const
{
unsigned i;
state *s;
FOR_EACH_VEC_ELT (m_states, i, s)
if (!strcmp (name, s->get_name ()))
return s;
/* Name not found. */
gcc_unreachable ();
}
/* Base implementation of state_machine::on_leak. */
std::unique_ptr<pending_diagnostic>
state_machine::on_leak (tree var ATTRIBUTE_UNUSED) const
{
return NULL;
}
/* Dump a multiline representation of this state machine to PP. */
void
state_machine::dump_to_pp (pretty_printer *pp) const
{
unsigned i;
state *s;
FOR_EACH_VEC_ELT (m_states, i, s)
{
pp_printf (pp, " state %i: ", i);
s->dump_to_pp (pp);
pp_newline (pp);
}
}
/* Return a new json::object of the form
{"name" : str,
"states" : [str]}. */
json::object *
state_machine::to_json () const
{
json::object *sm_obj = new json::object ();
sm_obj->set ("name", new json::string (m_name));
{
json::array *states_arr = new json::array ();
unsigned i;
state *s;
FOR_EACH_VEC_ELT (m_states, i, s)
states_arr->append (s->to_json ());
sm_obj->set ("states", states_arr);
}
return sm_obj;
}
/* class sm_context. */
const region_model *
sm_context::get_old_region_model () const
{
if (const program_state *old_state = get_old_program_state ())
return old_state->m_region_model;
else
return NULL;
}
/* Create instances of the various state machines, each using LOGGER,
and populate OUT with them. */
void
make_checkers (auto_delete_vec <state_machine> &out, logger *logger)
{
out.safe_push (make_malloc_state_machine (logger));
out.safe_push (make_fileptr_state_machine (logger));
out.safe_push (make_fd_state_machine (logger));
/* The "taint" checker must be explicitly enabled (as it currently
leads to state explosions that stop the other checkers working). */
if (flag_analyzer_checker)
out.safe_push (make_taint_state_machine (logger));
out.safe_push (make_sensitive_state_machine (logger));
out.safe_push (make_signal_state_machine (logger));
out.safe_push (make_va_list_state_machine (logger));
/* We only attempt to run the pattern tests if it might have been manually
enabled (for DejaGnu purposes). */
if (flag_analyzer_checker)
out.safe_push (make_pattern_test_state_machine (logger));
if (flag_analyzer_checker)
{
unsigned read_index, write_index;
state_machine **sm;
/* TODO: this leaks the machines
Would be nice to log the things that were removed. */
VEC_ORDERED_REMOVE_IF (out, read_index, write_index, sm,
0 != strcmp (flag_analyzer_checker,
(*sm)->get_name ()));
}
}
} // namespace ana
#endif /* #if ENABLE_ANALYZER */
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