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https://github.com/jart/cosmopolitan.git
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2bd1e72d5a
We can put this back the moment someone requests it. Pain-free garbage collection for the C language is pretty cool. All it does is overwrite the return address with a trampoline that calls free(). It's not clear what it should be named if it's made a public API.
101 lines
4.3 KiB
C
101 lines
4.3 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/bits/bits.h"
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#include "libc/runtime/buffer.h"
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#include "libc/runtime/gc.internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/testlib/testlib.h"
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#include "libc/x/x.h"
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#define ALIGN 128
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#define BUFSIZE (8 * 32)
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#define MASKSIZE (BUFSIZE / CHAR_BIT)
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const char kX[] = "aaaaaaaaeeeeeeeeeeeeeeeeeeeeeeee"
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"e e"
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"e e"
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"e e"
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"e e"
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"e e"
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"e e"
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"eeeeeeeeeeeeeeeeeeeeeeeeeeeeee-e";
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const char kY[] = "aaaaaaaaefffffffffffeffffffffff-"
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"f z-"
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"f f"
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"f f"
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"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
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"f f"
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"f f"
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"ffffffffffffffffffffffffffffff-f";
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const char kM[] = "11111111100000000000100000000000"
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"01111111111111111111111111111100"
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"01111111111111111111111111111110"
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"01111111111111111111111111111110"
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"00000000000000000000000000000000"
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"01111111111111111111111111111110"
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"01111111111111111111111111111110"
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"00000000000000000000000000000010";
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nodiscard char *binify(uint8_t *data, size_t size) {
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uint8_t b;
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size_t i, j;
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char *s, *p;
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p = s = xmalloc(size * CHAR_BIT + 1);
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for (i = 0; i < size; ++i) {
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b = data[i];
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for (j = 0; j < CHAR_BIT; ++j) {
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*p++ = "01"[b & 1];
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b >>= 1;
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}
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}
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*p = '\0';
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return s;
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}
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TEST(memeqmask, test) {
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struct GuardedBuffer x = {}, y = {}, m = {};
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memcpy(balloc(&x, ALIGN, BUFSIZE), kX, BUFSIZE);
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memcpy(balloc(&y, ALIGN, BUFSIZE), kY, BUFSIZE);
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balloc(&m, ALIGN, MASKSIZE);
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EXPECT_EQ((intptr_t)m.p, (intptr_t)memeqmask(m.p, x.p, y.p, BUFSIZE));
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EXPECT_STREQ(kM, gc(binify(m.p, MASKSIZE)));
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bfree(&m);
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bfree(&x);
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bfree(&y);
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}
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#if 0
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#include "libc/rand/rand.h"
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#include "libc/testlib/ezbench.h"
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TEST(memeqmask, bench) {
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size_t len = 64 * 1024;
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char *m = xmemalign(64, DIMMASK(len));
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char *x = xmemalign(64, len);
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char *y = xmemalign(64, len);
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EZBENCH(
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{
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rngset(x, len, rand64, -1);
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rngset(y, len, rand64, -1);
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},
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memeqmask(m, x, y, len));
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}
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#endif
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