120 lines
4.7 KiB
C
120 lines
4.7 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/assert.h"
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#include "libc/dce.h"
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#include "libc/macros.h"
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#include "libc/runtime/memtrack.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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static void RemoveMemoryIntervals(struct MemoryIntervals *mm, int i, int n) {
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assert(i >= 0);
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assert(i + n <= mm->i);
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memcpy(mm->p + i, mm->p + i + n,
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(intptr_t)(mm->p + mm->i) - (intptr_t)(mm->p + i + n));
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mm->i -= n;
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}
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static void CreateMemoryInterval(struct MemoryIntervals *mm, int i) {
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assert(i >= 0);
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assert(i <= mm->i);
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assert(mm->i < ARRAYLEN(mm->p));
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memmove(mm->p + i + 1, mm->p + i,
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(intptr_t)(mm->p + mm->i) - (intptr_t)(mm->p + i));
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++mm->i;
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}
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static int PunchHole(struct MemoryIntervals *mm, int x, int y, int i) {
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if (mm->i == ARRAYLEN(mm->p)) return enomem();
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CreateMemoryInterval(mm, i);
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mm->p[i].y = x - 1;
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mm->p[i + 1].x = y + 1;
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return 0;
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}
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int ReleaseMemoryIntervals(struct MemoryIntervals *mm, int x, int y,
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void wincb(struct MemoryIntervals *, int, int)) {
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unsigned l, r;
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assert(y >= x);
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assert(AreMemoryIntervalsOk(mm));
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if (!mm->i) return 0;
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l = FindMemoryInterval(mm, x);
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if (l == mm->i) return 0;
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if (!l && y < mm->p[l].x) return 0;
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if (y < mm->p[l].x) return 0;
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r = FindMemoryInterval(mm, y);
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if (r == mm->i || (r > l && y < mm->p[r].x)) --r;
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assert(r >= l);
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assert(x <= mm->p[r].y);
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if (l == r && x > mm->p[l].x && y < mm->p[l].y) {
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return PunchHole(mm, x, y, l);
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}
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if (x > mm->p[l].x && x <= mm->p[l].y) {
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assert(y >= mm->p[l].y);
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if (IsWindows()) return einval();
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mm->p[l].y = x - 1;
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assert(mm->p[l].x <= mm->p[l].y);
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++l;
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}
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if (y >= mm->p[r].x && y < mm->p[r].y) {
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assert(x <= mm->p[r].x);
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if (IsWindows()) return einval();
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mm->p[r].x = y + 1;
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assert(mm->p[r].x <= mm->p[r].y);
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--r;
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}
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if (l <= r) {
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if (IsWindows() && wincb) {
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wincb(mm, l, r);
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}
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RemoveMemoryIntervals(mm, l, r - l + 1);
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}
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return 0;
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}
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int TrackMemoryInterval(struct MemoryIntervals *mm, int x, int y, long h,
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int prot, int flags) {
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unsigned i;
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assert(y >= x);
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assert(AreMemoryIntervalsOk(mm));
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i = FindMemoryInterval(mm, x);
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if (i && x == mm->p[i - 1].y + 1 && h == mm->p[i - 1].h &&
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prot == mm->p[i - 1].prot && flags == mm->p[i - 1].flags) {
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mm->p[i - 1].y = y;
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if (i < mm->i && y + 1 == mm->p[i].x && h == mm->p[i].h &&
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prot == mm->p[i].prot && flags == mm->p[i].flags) {
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mm->p[i - 1].y = mm->p[i].y;
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RemoveMemoryIntervals(mm, i, 1);
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}
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} else if (i < mm->i && y + 1 == mm->p[i].x && h == mm->p[i].h &&
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prot == mm->p[i].prot && flags == mm->p[i].flags) {
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mm->p[i].x = x;
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} else {
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if (mm->i == ARRAYLEN(mm->p)) return enomem();
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CreateMemoryInterval(mm, i);
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mm->p[i].x = x;
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mm->p[i].y = y;
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mm->p[i].h = h;
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mm->p[i].prot = prot;
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mm->p[i].flags = flags;
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}
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return 0;
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}
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