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ww: preserve compiler sink outputs

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Hojun-Cho
2026-08-14 19:10:36 +09:00
parent 763bbc8f25
commit 25da54936d
3 changed files with 84 additions and 16 deletions
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42
selfhost/cmd/w6c/main.ww
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@@ -14,6 +14,7 @@ type publication = struct {
backup: str,
hadold: bool,
installed: bool,
passthrough: bool,
};
fn publicationpath(dst: *u8, kind: str) str = {
@@ -21,6 +22,17 @@ fn publicationpath(dst: *u8, kind: str) str = {
strconv.i32tos(os.getpid(), strconv.base.DEC), ".", kind);
};
fn pathischardevice(path: *u8) bool = {
let fi: os.filestat;
match (os.lstat(&fi, pathstr(path))) {
case void => {
return (((fi.mode: u32) & 61440u32) == (os.mode.CHR: u32));
};
case let e: os.oserror => return false;
};
return false;
};
// Open a destination-adjacent file and immediately unlink its name. Cgen's
// fatal exit then leaves only a kernel-owned fd, never a partial destination
// or named staging artifact.
@@ -28,6 +40,12 @@ fn anonymousfd(dst: *u8, kind: str) i32 = {
let path: str = publicationpath(dst, kind);
let fd: i32 = os.open(path,
os.flag.RDWR | os.flag.CREATE | os.flag.EXCL, 384i32);
if (fd < 0 && pathischardevice(dst)) {
path = strings.concat("/tmp/ww-w6c.",
strconv.i32tos(os.getpid(), strconv.base.DEC), ".", kind);
fd = os.open(path,
os.flag.RDWR | os.flag.CREATE | os.flag.EXCL, 384i32);
};
if (fd < 0) {
os.write(2, "w6c: cannot create anonymous output\n".ptr,
"w6c: cannot create anonymous output\n".len: u64);
@@ -60,6 +78,21 @@ fn copystream(src: i32, dst: i32) bool = {
fn materializestream(src: i32, dst: *u8, p: *publication) bool = {
p.dst = dst;
p.passthrough = false;
let fi: os.filestat;
match (os.lstat(&fi, pathstr(dst))) {
case void => {
if (((fi.mode: u32) & 61440u32) == (os.mode.CHR: u32)) {
let sink: i32 = os.open(pathstr(dst), os.flag.WRONLY, 0i32);
if (sink < 0) { return false; };
let sinkok: bool = copystream(src, sink);
if (os.close(sink) != 0) { sinkok = false; };
if (sinkok) { p.passthrough = true; };
return sinkok;
};
};
case let e: os.oserror => void;
};
p.stage = publicationpath(dst, "new");
p.backup = publicationpath(dst, "old");
p.hadold = false;
@@ -110,6 +143,7 @@ fn publishall(p: *publication, n: i32) bool = {
let i: i32 = 0;
let ok: bool = true;
for (i < n) {
if (p[i].passthrough) { i += 1; continue; };
if (!pathisregularnofollow(p[i].stage)) {
publishdiag("w6c: publication stage is not a regular file for ",
p[i].dst);
@@ -140,6 +174,7 @@ fn publishall(p: *publication, n: i32) bool = {
if (ok) {
i = 0;
for (i < n) {
if (p[i].passthrough) { i += 1; continue; };
let exists: i32 = pathexistsnofollow(p[i].backup);
if (exists != 0) {
if (exists < 0) {
@@ -157,6 +192,7 @@ fn publishall(p: *publication, n: i32) bool = {
if (ok) {
i = 0;
for (i < n) {
if (p[i].passthrough) { i += 1; continue; };
let rc: i32 = os.rename(pathstr(p[i].dst), p[i].backup);
if (rc == 0) { p[i].hadold = true; }
else { if (rc != -2) {
@@ -170,6 +206,7 @@ fn publishall(p: *publication, n: i32) bool = {
if (ok) {
i = 0;
for (i < n) {
if (p[i].passthrough) { i += 1; continue; };
if (os.rename(p[i].stage, pathstr(p[i].dst)) != 0) {
publishdiag("w6c: cannot publish ", p[i].dst);
ok = false;
@@ -183,7 +220,8 @@ fn publishall(p: *publication, n: i32) bool = {
// truthfully turn a completely installed pair into rejection.
i = 0;
for (i < n) {
if (p[i].hadold && os.remove(p[i].backup) != 0) {
if (!p[i].passthrough && p[i].hadold
&& os.remove(p[i].backup) != 0) {
publishdiag("w6c: cannot remove backup for ", p[i].dst);
};
i += 1;
@@ -193,6 +231,7 @@ fn publishall(p: *publication, n: i32) bool = {
};
i = n - 1;
for (i >= 0) {
if (p[i].passthrough) { i -= 1; continue; };
if (p[i].installed) { os.remove(pathstr(p[i].dst)); };
if (p[i].hadold) { os.rename(p[i].backup, pathstr(p[i].dst)); };
if (p[i].stage.len != 0) { os.remove(p[i].stage); };
@@ -882,6 +921,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
pubs[pi].backup = "";
pubs[pi].hadold = false;
pubs[pi].installed = false;
pubs[pi].passthrough = false;
pi += 1;
};
let npub: i32 = 0;