1/*
2 * Copyright (c) 2015-2017, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** \file
30 * \brief NFA acceleration analysis code.
31 */
32
33#ifndef NG_LIMEX_ACCEL_H
34#define NG_LIMEX_ACCEL_H
35
36#include "ng_holder.h"
37#include "ng_misc_opt.h"
38#include "ue2common.h"
39#include "nfa/accelcompile.h"
40#include "util/accel_scheme.h"
41#include "util/charreach.h"
42#include "util/flat_containers.h"
43#include "util/order_check.h"
44
45#include <map>
46#include <vector>
47
48namespace ue2 {
49
50/* compile time accel defs */
51#define MAX_MERGED_ACCEL_STOPS 200
52#define ACCEL_MAX_STOP_CHAR 24
53#define ACCEL_MAX_FLOATING_STOP_CHAR 192 /* accelerating sds is important */
54
55// forward-declaration of CompileContext
56struct CompileContext;
57
58void findAccelFriends(const NGHolder &g, NFAVertex v,
59 const std::map<NFAVertex, BoundedRepeatSummary> &br_cyclic,
60 u32 offset, flat_set<NFAVertex> *friends);
61
62#define DOUBLE_SHUFTI_LIMIT 20
63
64NFAVertex get_sds_or_proxy(const NGHolder &g);
65
66AccelScheme nfaFindAccel(const NGHolder &g, const std::vector<NFAVertex> &verts,
67 const std::vector<CharReach> &refined_cr,
68 const std::map<NFAVertex, BoundedRepeatSummary> &br_cyclic,
69 bool allow_wide, bool look_for_double_byte = false);
70
71AccelScheme findBestAccelScheme(std::vector<std::vector<CharReach> > paths,
72 const CharReach &terminating,
73 bool look_for_double_byte = false);
74
75/** \brief Check if vertex \a v is an accelerable state (for a limex NFA). If a
76 * single byte accel scheme is found it is placed into *as
77 */
78bool nfaCheckAccel(const NGHolder &g, NFAVertex v,
79 const std::vector<CharReach> &refined_cr,
80 const std::map<NFAVertex, BoundedRepeatSummary> &br_cyclic,
81 AccelScheme *as, bool allow_wide);
82
83
84} // namespace ue2
85
86#endif
87