1/*
2 * Copyright (c) 2015-2016, 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
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 LimEx NFA: native GPR runtime implementations.
31 */
32
33//#define DEBUG
34//#define DEBUG_INPUT
35//#define DEBUG_EXCEPTIONS
36
37#include "limex.h"
38
39#include "accel.h"
40#include "limex_internal.h"
41#include "nfa_internal.h"
42#include "ue2common.h"
43#include "util/bitutils.h"
44
45// Common code
46#define STATE_ON_STACK
47#define ESTATE_ON_STACK
48
49#include "limex_runtime.h"
50
51// Other implementation code from X-Macro impl.
52#define SIZE 32
53#define STATE_T u32
54#define ENG_STATE_T u32
55#define LOAD_FROM_ENG load_u32
56
57#include "limex_state_impl.h"
58
59#define INLINE_ATTR really_inline
60#include "limex_common_impl.h"
61
62////////////////////////////////////////////////////////////////////////////
63// LimEx NFA implementation code - general purpose registers
64////////////////////////////////////////////////////////////////////////////
65
66// Process exceptional states
67
68#define STATE_ON_STACK
69#define ESTATE_ON_STACK
70#define RUN_EXCEPTION_FN_ONLY
71#include "limex_exceptional.h"
72
73static really_inline
74int processExceptional32(u32 s, u32 estate, UNUSED u32 diffmask, u32 *succ,
75 const struct LimExNFA32 *limex,
76 const struct NFAException32 *exceptions, u64a offset,
77 struct NFAContext32 *ctx, char in_rev, char flags) {
78 assert(estate != 0); // guaranteed by calling macro
79
80 if (estate == ctx->cached_estate) {
81 DEBUG_PRINTF("using cached succ from previous state\n");
82 *succ |= ctx->cached_esucc;
83 if (ctx->cached_reports && (flags & CALLBACK_OUTPUT)) {
84 DEBUG_PRINTF("firing cached reports from previous state\n");
85 if (unlikely(limexRunReports(ctx->cached_reports, ctx->callback,
86 ctx->context, offset)
87 == MO_HALT_MATCHING)) {
88 return PE_RV_HALT; // halt;
89 }
90 }
91 return 0;
92 }
93
94 u32 orig_estate = estate; // for caching
95 u32 local_succ = 0;
96 struct proto_cache new_cache = {0, NULL};
97 enum CacheResult cacheable = CACHE_RESULT;
98
99 /* Note that only exception-states that consist of exceptions that _only_
100 * set successors (not fire accepts or squash states) are cacheable. */
101
102 do {
103 u32 bit = findAndClearLSB_32(&estate);
104 u32 idx = rank_in_mask32(limex->exceptionMask, bit);
105 const struct NFAException32 *e = &exceptions[idx];
106 if (!runException32(e, s, succ, &local_succ, limex, offset, ctx,
107 &new_cache, &cacheable, in_rev, flags)) {
108 return PE_RV_HALT;
109 }
110 } while (estate != 0);
111
112 *succ |= local_succ;
113
114 if (cacheable == CACHE_RESULT) {
115 ctx->cached_estate = orig_estate;
116 ctx->cached_esucc = local_succ;
117 ctx->cached_reports = new_cache.reports;
118 ctx->cached_br = new_cache.br;
119 } else if (cacheable == DO_NOT_CACHE_RESULT_AND_FLUSH_BR_ENTRIES) {
120 if (ctx->cached_br) {
121 ctx->cached_estate = 0U;
122 }
123 }
124
125 return 0;
126}
127
128// 32-bit models.
129#include "limex_runtime_impl.h"
130