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/* Support for plugin-supplied behaviors of known functions.
Copyright (C) 2022-2024 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 "analyzer/analyzer.h"
#include "diagnostic-core.h"
#include "analyzer/analyzer-logging.h"
#include "stringpool.h"
#include "basic-block.h"
#include "gimple.h"
#include "analyzer/known-function-manager.h"
#include "analyzer/region-model.h"
#include "analyzer/call-details.h"
#if ENABLE_ANALYZER
namespace ana {
/* class known_function_manager : public log_user. */
known_function_manager::known_function_manager (logger *logger)
: log_user (logger)
{
memset (m_combined_fns_arr, 0, sizeof (m_combined_fns_arr));
}
known_function_manager::~known_function_manager ()
{
/* Delete all owned kfs. */
for (auto iter : m_map_id_to_kf)
delete iter.second;
for (auto iter : m_std_ns_map_id_to_kf)
delete iter.second;
for (auto iter : m_combined_fns_arr)
delete iter;
}
void
known_function_manager::add (const char *name,
std::unique_ptr<known_function> kf)
{
LOG_FUNC_1 (get_logger (), "registering %s", name);
tree id = get_identifier (name);
m_map_id_to_kf.put (id, kf.release ());
}
void
known_function_manager::add_std_ns (const char *name,
std::unique_ptr<known_function> kf)
{
LOG_FUNC_1 (get_logger (), "registering std::%s", name);
tree id = get_identifier (name);
m_std_ns_map_id_to_kf.put (id, kf.release ());
}
void
known_function_manager::add (enum built_in_function name,
std::unique_ptr<known_function> kf)
{
gcc_assert (name < END_BUILTINS);
delete m_combined_fns_arr[name];
m_combined_fns_arr[name] = kf.release ();
}
void
known_function_manager::add (enum internal_fn ifn,
std::unique_ptr<known_function> kf)
{
gcc_assert (ifn < IFN_LAST);
delete m_combined_fns_arr[ifn + END_BUILTINS];
m_combined_fns_arr[ifn + END_BUILTINS] = kf.release ();
}
/* Get any known_function for FNDECL for call CD.
The call must match all assumptions made by the known_function (such as
e.g. "argument 1's type must be a pointer type").
Return NULL if no known_function is found, or it does not match the
assumption(s). */
const known_function *
known_function_manager::get_match (tree fndecl, const call_details &cd) const
{
/* Look for a matching built-in. */
if (fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
{
if (const known_function *candidate
= get_normal_builtin (DECL_FUNCTION_CODE (fndecl)))
if (gimple_builtin_call_types_compatible_p (cd.get_call_stmt (),
fndecl))
return candidate;
}
/* Look for a match by name. */
if (is_std_function_p (fndecl))
{
if (tree identifier = DECL_NAME (fndecl))
if (const known_function *candidate
= get_by_identifier_in_std_ns (identifier))
if (candidate->matches_call_types_p (cd))
return candidate;
return nullptr;
}
if (DECL_CONTEXT (fndecl)
&& TREE_CODE (DECL_CONTEXT (fndecl)) != TRANSLATION_UNIT_DECL)
return NULL;
if (tree identifier = DECL_NAME (fndecl))
if (const known_function *candidate = get_by_identifier (identifier))
if (candidate->matches_call_types_p (cd))
return candidate;
return NULL;
}
/* Get any known_function for IFN, or NULL. */
const known_function *
known_function_manager::get_internal_fn (enum internal_fn ifn) const
{
gcc_assert (ifn < IFN_LAST);
return m_combined_fns_arr[ifn + END_BUILTINS];
}
/* Get any known_function for NAME, without type-checking.
Return NULL if there isn't one. */
const known_function *
known_function_manager::get_normal_builtin (enum built_in_function name) const
{
/* The numbers for built-in functions in enum combined_fn are the same as
for the built_in_function enum. */
gcc_assert (name < END_BUILTINS);
return m_combined_fns_arr[name];
}
const known_function *
known_function_manager::
get_normal_builtin (const builtin_known_function *builtin_kf) const
{
return get_normal_builtin (builtin_kf->builtin_code ());
}
/* Get any known_function matching IDENTIFIER, without type-checking.
Return NULL if there isn't one. */
const known_function *
known_function_manager::get_by_identifier (tree identifier) const
{
known_function_manager *mut_this = const_cast<known_function_manager *>(this);
known_function **slot = mut_this->m_map_id_to_kf.get (identifier);
if (slot)
return *slot;
else
return NULL;
}
/* Get any known_function in C++ std:: namespace matching IDENTIFIER, without
type-checking.
Return nullptr if there isn't one. */
const known_function *
known_function_manager::get_by_identifier_in_std_ns (tree identifier) const
{
known_function_manager *mut_this = const_cast<known_function_manager *>(this);
known_function **slot = mut_this->m_std_ns_map_id_to_kf.get (identifier);
if (slot)
return *slot;
else
return nullptr;
}
} // namespace ana
#endif /* #if ENABLE_ANALYZER */
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