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Improve dead code elimination

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This commit is contained in:
Justine Tunney 2021-02-08 04:04:42 -08:00
parent 760db8c5ad
commit 0e36cb3ac4
6606 changed files with 9685 additions and 9854 deletions
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70
libc/stdio/dirstream.c
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@ -17,7 +17,6 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/bits/progn.internal.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/dirent.h"
#include "libc/dce.h"
@ -47,8 +46,8 @@
* Directory stream object.
*/
struct dirstream {
int64_t tell;
int64_t fd;
int64_t tell;
struct dirent ent;
union {
struct {
@ -98,24 +97,48 @@ struct dirent_netbsd {
char d_name[512];
};
static textwindows noinline DIR *opendir_nt(const char *name) {
int len;
static textwindows DIR *opendir_nt_impl(char16_t name[PATH_MAX], size_t len) {
DIR *res;
char16_t name16[PATH_MAX];
if ((len = __mkntpath(name, name16)) == -1) return NULL;
if (len + 2 + 1 > PATH_MAX) return PROGN(enametoolong(), NULL);
while (name16[len - 1] == u'\\') name16[--len] = u'\0';
name16[len++] = u'\\';
name16[len++] = u'*';
name16[len] = u'\0';
if (!(res = calloc(1, sizeof(DIR)))) return NULL;
if ((res->fd = FindFirstFile(name16, &res->windata)) != -1) {
return res;
if (len + 2 + 1 <= PATH_MAX) {
if (name[len - 1] != u'\\') name[len++] = u'\\';
name[len++] = u'*';
name[len] = u'\0';
if ((res = calloc(1, sizeof(DIR)))) {
if ((res->fd = FindFirstFile(name, &res->windata)) != -1) {
return res;
} else {
__winerr();
}
free(res);
}
} else {
__winerr();
free(res);
return NULL;
enametoolong();
}
return NULL;
}
static textwindows noinline DIR *opendir_nt(const char *path) {
int len;
char16_t name[PATH_MAX];
if ((len = __mkntpath(path, name)) == -1) return NULL;
return opendir_nt_impl(name, len);
}
static textwindows noinline DIR *fdopendir_nt(int fd) {
DIR *res;
char16_t name[PATH_MAX];
if (__isfdkind(fd, kFdFile)) {
if ((res = opendir_nt_impl(
name, GetFinalPathNameByHandle(
g_fds.p[fd].handle, name, ARRAYLEN(name),
kNtFileNameNormalized | kNtVolumeNameDos)))) {
close(fd);
return res;
}
} else {
ebadf();
}
return NULL;
}
static textwindows noinline struct dirent *readdir_nt(DIR *dir) {
@ -193,14 +216,12 @@ DIR *opendir(const char *name) {
DIR *fdopendir(int fd) {
DIR *dir;
if (!IsWindows()) {
if ((dir = calloc(1, sizeof(*dir)))) {
dir->fd = fd;
return dir;
}
if (!(dir = calloc(1, sizeof(*dir)))) return NULL;
dir->fd = fd;
return dir;
} else {
enosys(); /* TODO(jart): Implement me! */
return fdopendir_nt(fd);
}
return NULL;
}
/**
@ -221,7 +242,7 @@ struct dirent *readdir(DIR *dir) {
struct dirent_openbsd *obsd;
if (!IsWindows()) {
if (dir->buf_pos >= dir->buf_end) {
basep = dir->tell; /* <- what does xnu do */
basep = dir->tell; /* TODO(jart): what does xnu do */
rc = getdents(dir->fd, dir->buf, sizeof(dir->buf) - 256, &basep);
if (!rc || rc == -1) return NULL;
dir->buf_pos = 0;
@ -295,5 +316,6 @@ long telldir(DIR *dir) {
* Returns file descriptor associated with DIR object.
*/
int dirfd(DIR *dir) {
if (IsWindows()) return eopnotsupp();
return dir->fd;
}