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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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14
libc/intrin/getmainstack.c
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@ -28,9 +28,14 @@
#include "libc/sysv/consts/rlim.h"
#include "libc/sysv/consts/rlimit.h"
// Hack for guessing boundaries of _start()'s stack
// Hack for guessing the unknowable boundaries of _start()'s stack
//
// Every UNIX system in our support vector creates arg blocks like:
// This code always guesses correctly on Windows because WinMain()
// is written to allocate a stack ourself. Local testing on Linux,
// XNU, FreeBSD, OpenBSD, and NetBSD says that accuracy is ±1 page
// and that error rate applies to both beginning and end addresses
//
// Every UNIX system in our support vector creates arg blocks like
//
// <HIGHEST-STACK-ADDRESS>
// last environ string
@ -55,11 +60,6 @@
// up to the microprocessor page size (this computes the top addr)
// and the bottom is computed by subtracting RLIMIT_STACK rlim_cur
// It's simple but gets tricky if we consider environ can be empty
//
// This code always guesses correctly on Windows because WinMain()
// is written to allocate a stack ourself. Local testing on Linux,
// XNU, FreeBSD, OpenBSD, and NetBSD says that accuracy is ±1 page
// and that error rate applies to both beginning and end addresses
static char *__get_last(char **list) {
char *res = 0;