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https://github.com/jart/cosmopolitan.git
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1ff9ab95ac
This change enables Address Sanitizer systemically w/ `make MODE=dbg`. Our version of Rust's `unsafe` keyword is named `noasan` which is used for two functions that do aligned memory chunking, like `strcpy.c` and we need to fix the tiny DEFLATE code, but that's it everything else is fabulous you can have all the fischer price security blankets you need Best of all is we're now able to use the ASAN data in Blinkenlights to colorize the memory dumps. See the screenshot below of a test program: https://justine.lol/blinkenlights/asan.png Which is operating on float arrays stored on the stack, with red areas indicating poisoned memory, and the green areas indicate valid memory.
79 lines
4.8 KiB
C
79 lines
4.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/nexgen32e/crc32.h"
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extern const uint32_t kCrc32cTab[256];
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/**
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* Computes Castagnoli CRC-32 on old computers.
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*/
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uint32_t crc32c$pure(uint32_t init, const void *data, size_t size) {
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const unsigned char *p = data;
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uint32_t h = init ^ 0xffffffff;
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unsigned i;
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for (i = 0; i < size; i++) {
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h = h >> 8 ^ kCrc32cTab[(h & 0xff) ^ p[i]];
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}
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return h ^ 0xffffffff;
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}
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/*
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bench_crc32c$pure for #c per n where c ≈ 0.293ns
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N x1 x8 x64 mBps
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------------------------------------------------------------
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1 4305.000 91.375 44.203 74
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1 75.000 55.875 44.703 73
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2 46.500 35.188 24.617 132
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3 40.333 26.625 19.193 169
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4 32.250 19.969 16.215 200
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7 18.429 15.089 12.033 270
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8 20.625 13.547 11.607 280
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15 15.667 10.775 9.589 339
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16 17.562 10.695 9.419 345
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31 12.226 8.891 8.317 391
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32 13.219 8.480 8.078 402
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63 9.571 8.065 7.731 420
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64 9.672 7.955 7.633 426
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127 8.433 7.548 7.329 443
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128 8.492 7.528 7.352 442
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255 7.557 7.366 7.239 449
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256 7.699 7.342 7.305 445
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511 7.376 7.243 7.223 450
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512 7.408 7.233 7.225 450
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1023 7.188 7.192 7.098 458
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1024 7.171 7.194 7.097 458
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2047 7.130 7.172 7.085 459
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2048 7.117 7.170 7.169 453
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4095 7.063 7.076 7.085 459
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4096 7.078 7.161 7.081 459
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8191 7.041 7.095 7.055 461
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8192 7.051 7.098 7.087 459
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16383 7.039 7.114 7.067 460
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16384 6.876 6.931 7.133 456
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32767 7.055 7.108 7.290 446
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32768 6.868 6.887 6.974 466
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65535 6.984 6.885 6.967 467
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65536 6.877 6.924 10.994 296
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131071 7.166 7.141 7.011 464
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131072 6.853 6.971 7.694 422
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262143 6.853 7.213 7.406 439
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262144 6.852 6.968 7.290 446
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524287 7.398 7.389 7.166 454
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524288 6.851 7.094 7.159 454
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*/
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