mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
120 lines
5.5 KiB
C
120 lines
5.5 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/calls/calls.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/intrin/bsr.h"
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#include "libc/log/check.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/gc.h"
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#include "libc/sock/sock.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/x/x.h"
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#include "tool/build/lib/persist.h"
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static bool IsWithin(size_t sz1, void *vp1, size_t sz2, void *vp2) {
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char *p1 = vp1, *p2 = vp2;
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return p1 >= p2 && p1 + sz1 <= p2 + sz2;
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}
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static bool IsOverlapping(void *vx1, void *vy1, void *vx2, void *vy2) {
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char *x1 = vx1, *y1 = vy1, *x2 = vx2, *y2 = vy2;
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return (x1 >= x2 && x1 <= y2) || (y1 >= x2 && y1 <= y2);
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}
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static bool IsOverlappingIov(struct iovec *a, struct iovec *b) {
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char *ap = a->iov_base, *bp = b->iov_base;
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return IsOverlapping(ap, ap + a->iov_len, bp, bp + b->iov_len);
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}
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/**
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* Writes struct w/ dynamic arrays to mappable file, e.g.
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*
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* PersistObject(path, 64, &(struct ObjectParam){
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* sizeof(*o), o, &o->magic, &o->abi,
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* &(struct ObjectArrayParam){
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* {&o->a1.i, sizeof(o->a1.p[0]), &o->a1.p},
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* {&o->a2.i, sizeof(o->a2.p[0]), &o->a2.p},
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* {0},
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* }});
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*
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* @param obj->magic needs to be unique for struct
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* @param obj->abi monotonically tracks breaking changes
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* @param obj->arrays needs sentinel with item size of zero
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* @note non-recursive i.e. array elements can't have pointers
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* @see MapObject()
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*/
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void PersistObject(const char *path, size_t align,
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const struct ObjectParam *obj) {
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const char *pad;
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struct iovec *iov;
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int i, n, fd, iovlen;
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long len, size, bytes, filesize;
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unsigned char *hdr, *p1, *p2, **pp;
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intptr_t arrayptroffset, arraydataoffset;
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filesize = 0;
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DCHECK_GE(align, 1);
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CHECK_GT(*obj->magic, 0);
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CHECK_GT(*obj->abi, 0);
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CHECK(IsWithin(sizeof(*obj->magic), obj->magic, obj->size, obj->p));
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CHECK(IsWithin(sizeof(*obj->abi), obj->abi, obj->size, obj->p));
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for (n = i = 0; obj->arrays[i].size; ++i) ++n;
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iovlen = (n + 1) * 2;
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pad = _gc(xcalloc(align, 1));
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hdr = _gc(xmalloc(obj->size));
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iov = _gc(xcalloc(iovlen, sizeof(*iov)));
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bytes = obj->size;
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iov[0].iov_base = memcpy(hdr, obj->p, obj->size);
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iov[0].iov_len = bytes;
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iov[1].iov_base = pad;
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iov[1].iov_len = ROUNDUP(bytes, align) - bytes;
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filesize += ROUNDUP(bytes, align);
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for (i = 0; i < n; ++i) {
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pp = obj->arrays[i].pp;
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len = obj->arrays[i].len;
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size = obj->arrays[i].size;
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if (!*pp || !len) continue;
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p1 = obj->p;
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p2 = obj->arrays[i].pp;
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arrayptroffset = p2 - p1;
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arraydataoffset = filesize;
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CHECK((!len || _bsrl(len) + _bsrl(size) < 31),
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"path=%s i=%d len=%,lu size=%,lu", path, i, len, size);
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CHECK(IsWithin(sizeof(void *), pp, obj->size, obj->p));
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CHECK(!IsOverlapping(pp, pp + sizeof(void *), obj->magic,
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obj->magic + sizeof(*obj->magic)));
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CHECK(!IsOverlapping(pp, pp + sizeof(void *), obj->abi,
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obj->abi + sizeof(*obj->abi)));
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memcpy(hdr + arrayptroffset, &arraydataoffset, sizeof(intptr_t));
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CHECK_LT(filesize + arraydataoffset, 0x7ffff000);
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bytes = len * size;
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iov[(i + 1) * 2 + 0].iov_base = *pp;
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iov[(i + 1) * 2 + 0].iov_len = bytes;
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iov[(i + 1) * 2 + 1].iov_base = pad;
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iov[(i + 1) * 2 + 1].iov_len = ROUNDUP(bytes, align) - bytes;
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filesize += ROUNDUP(bytes, align);
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CHECK(!IsOverlappingIov(&iov[(i + 0) * 2], &iov[(i + 1) * 2]),
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"iov[%d]={%#p,%#x}, iov[%d]={%#p,%#x} path=%s", (i + 0) * 2,
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iov[(i + 0) * 2].iov_base, iov[(i + 0) * 2].iov_len, (i + 1) * 2,
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iov[(i + 1) * 2].iov_base, iov[(i + 1) * 2].iov_len, path);
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}
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CHECK_NE(-1, (fd = creat(path, 0644)), "%s", path);
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CHECK_EQ(filesize, writev(fd, iov, iovlen));
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CHECK_NE(-1, close(fd));
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}
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