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Rewrite ZipOS

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This reduces the virtual memory usage of Emacs for me by 30%. We now
have a simpler implementation that uses read(), rather mmap()ing the
whole executable.
This commit is contained in:
Justine Tunney 2023-10-03 07:27:25 -07:00
parent ff77f2a6af
commit b01282e23e
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GPG key ID: BE714B4575D6E328
21 changed files with 408 additions and 421 deletions
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4
libc/runtime/zipos-mmap.c
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@ -50,7 +50,7 @@
* @return virtual base address of new mapping, or MAP_FAILED w/ errno
*/
void *__zipos_mmap(void *addr, size_t size, int prot, int flags,
struct ZiposHandle *h, int64_t off) {
struct ZiposHandle *h, int64_t off) {
if (off < 0) {
STRACE("negative zipos mmap offset");
@ -58,7 +58,7 @@ void *__zipos_mmap(void *addr, size_t size, int prot, int flags,
}
if (h->cfile == ZIPOS_SYNTHETIC_DIRECTORY ||
S_ISDIR(GetZipCfileMode(h->zipos->map + h->cfile))) {
S_ISDIR(GetZipCfileMode(h->zipos->cdir + h->cfile))) {
return VIP(eisdir());
}