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/* Code coverage instrumentation for fuzzing.
Copyright (C) 2015-2016 Free Software Foundation, Inc.
Contributed by Dmitry Vyukov <dvyukov@google.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"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "basic-block.h"
#include "options.h"
#include "flags.h"
#include "stmt.h"
#include "gimple-iterator.h"
#include "tree-cfg.h"
#include "tree-pass.h"
#include "tree-iterator.h"
#include "asan.h"
namespace {
unsigned
sancov_pass (function *fun)
{
initialize_sanitizer_builtins ();
/* Insert callback into beginning of every BB. */
tree fndecl = builtin_decl_implicit (BUILT_IN_SANITIZER_COV_TRACE_PC);
basic_block bb;
FOR_EACH_BB_FN (bb, fun)
{
gimple_stmt_iterator gsi = gsi_after_labels (bb);
if (gsi_end_p (gsi))
continue;
gimple *stmt = gsi_stmt (gsi);
gimple *gcall = gimple_build_call (fndecl, 0);
gimple_set_location (gcall, gimple_location (stmt));
gsi_insert_before (&gsi, gcall, GSI_SAME_STMT);
}
return 0;
}
template <bool O0> class pass_sancov : public gimple_opt_pass
{
public:
pass_sancov (gcc::context *ctxt) : gimple_opt_pass (data, ctxt) {}
static const pass_data data;
opt_pass *
clone ()
{
return new pass_sancov<O0> (m_ctxt);
}
virtual bool
gate (function *)
{
return flag_sanitize_coverage && (!O0 || !optimize);
}
virtual unsigned int
execute (function *fun)
{
return sancov_pass (fun);
}
}; // class pass_sancov
template <bool O0>
const pass_data pass_sancov<O0>::data = {
GIMPLE_PASS, /* type */
O0 ? "sancov_O0" : "sancov", /* name */
OPTGROUP_NONE, /* optinfo_flags */
TV_NONE, /* tv_id */
(PROP_cfg), /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_update_ssa, /* todo_flags_finish */
};
} // anon namespace
gimple_opt_pass *
make_pass_sancov (gcc::context *ctxt)
{
return new pass_sancov<false> (ctxt);
}
gimple_opt_pass *
make_pass_sancov_O0 (gcc::context *ctxt)
{
return new pass_sancov<true> (ctxt);
}
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