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Rewrite Cosmopolitan Ar

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The build/bootstrap/ar.com program is now tinier. This change reduces
its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar
performance is now 2x better than llvm-ar largely thanks to using the
copy_file_range() system call. This change homebrews a new allocation
API that addresses the shortcomings of the C standard library design.
Using these new balloc() and reballoc() functions I managed to reduce
memory consumption so much that Cosmpolitan Ar should now use roughly
100x fewer bytes of peak resident memory compared to llvm-ar. Correct
behavior with better compatibility has been assured. Binary output is
now pretty much bit-identical to llvm-ar, as of this change. This can
and should be the living proof we need to show that a better world is
possible for software.
This commit is contained in:
Justine Tunney 2023-07-02 10:19:16 -07:00
parent 197aa0d465
commit 0c630d95b5
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GPG key ID: BE714B4575D6E328
27 changed files with 916 additions and 341 deletions
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9
libc/stdio/fflushimpl.c
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@ -18,6 +18,7 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/intrin/weaken.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/internal.h"
@ -27,8 +28,12 @@
int __fflush_impl(FILE *f) {
size_t i;
ssize_t rc;
free(f->getln);
f->getln = 0;
if (f->getln) {
if (_weaken(free)) {
_weaken(free)(f->getln);
}
f->getln = 0;
}
if (f->beg && !f->end && (f->iomode & O_ACCMODE) != O_RDONLY) {
for (i = 0; i < f->beg; i += rc) {
if ((rc = write(f->fd, f->buf + i, f->beg - i)) == -1) {