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 |
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 Truffle compiler |
31 | * |
32 | * truffle is always able to represent an entire character class, providing a |
33 | * backstop to other acceleration engines. |
34 | */ |
35 | |
36 | #include "trufflecompile.h" |
37 | |
38 | #include "ue2common.h" |
39 | #include "util/charreach.h" |
40 | #include "util/dump_mask.h" |
41 | #include "util/simd_types.h" |
42 | |
43 | #include <cstring> |
44 | |
45 | using namespace std; |
46 | |
47 | namespace ue2 { |
48 | |
49 | /* |
50 | * To represent an entire charclass (256 chars), truffle uses two 128 bit |
51 | * masks - the first is for chars that do not have the high bit/bit 7 set, |
52 | * i.e. chars {0..127}. The second mask is for chars with bit 7 set. |
53 | * |
54 | * Each char to be represented is split into the low nibble (bits {0..3}) and |
55 | * bits {4,5,6} - the low nibble is the offset into the mask and the value of |
56 | * bits 456 is the bit that is set at that offset. |
57 | */ |
58 | |
59 | void truffleBuildMasks(const CharReach &cr, u8 *shuf_mask_lo_highclear, |
60 | u8 *shuf_mask_lo_highset) { |
61 | memset(shuf_mask_lo_highset, 0, sizeof(m128)); |
62 | memset(shuf_mask_lo_highclear, 0, sizeof(m128)); |
63 | |
64 | for (size_t v = cr.find_first(); v != CharReach::npos; |
65 | v = cr.find_next(v)) { |
66 | DEBUG_PRINTF("adding 0x%02x to %s\n" , (u8)v, (v & 0x80) ? "highset" : "highclear" ); |
67 | u8 *change_mask = (v & 0x80) ? shuf_mask_lo_highset : shuf_mask_lo_highclear; |
68 | u8 low_nibble = v & 0xf; |
69 | u8 bits_456 = (v & 0x70) >> 4; |
70 | change_mask[low_nibble] |= 1 << bits_456; |
71 | } |
72 | } |
73 | |
74 | /* |
75 | * Reconstruct the charclass that the truffle masks represent |
76 | */ |
77 | CharReach truffle2cr(const u8 *highclear, const u8 *highset) { |
78 | CharReach cr; |
79 | for (u8 i = 0; i < 16; i++) { |
80 | u32 bits_456 = highclear[i]; |
81 | while (bits_456) { |
82 | u32 pos = findAndClearLSB_32(&bits_456); |
83 | assert(pos < 8); |
84 | cr.set(pos << 4 | i); |
85 | } |
86 | bits_456 = highset[i]; |
87 | while (bits_456) { |
88 | u32 pos = findAndClearLSB_32(&bits_456); |
89 | assert(pos < 8); |
90 | cr.set(0x80 | pos << 4 | i); |
91 | } |
92 | } |
93 | return cr; |
94 | } |
95 | |
96 | } // namespc |
97 | |