Remove ERRNO_MESSAGES from JS library. NFC

The native `strerror()` function can be used instead in the two
places that still depend on `ERRNO_MESSAGES`

Author: sbc100

src/jsifier.mjs

@@ -124,6 +124,9 @@ function getTransitiveDeps(symbol, debug) {
       directDeps = directDeps.filter((d) => typeof d === 'string');
       for (const dep of directDeps) {
         const resolved = resolveAlias(dep);
+        if (VERBOSE && !transitiveDeps.has(dep)) {
+          printErr(`adding dependency ${symbol} -> ${dep}`);
+        }
         transitiveDeps.add(resolved);
         toVisit.push(resolved);
       }

src/library.js

@@ -1431,129 +1431,15 @@ addToLibrary({
     'EOWNERDEAD': {{{ cDefs.EOWNERDEAD }}},
     'ESTRPIPE': {{{ cDefs.ESTRPIPE }}},
   }`,
-  $ERRNO_MESSAGES: {
-    0: 'Success',
-    {{{ cDefs.EPERM }}}: 'Not super-user',
-    {{{ cDefs.ENOENT }}}: 'No such file or directory',
-    {{{ cDefs.ESRCH }}}: 'No such process',
-    {{{ cDefs.EINTR }}}: 'Interrupted system call',
-    {{{ cDefs.EIO }}}: 'I/O error',
-    {{{ cDefs.ENXIO }}}: 'No such device or address',
-    {{{ cDefs.E2BIG }}}: 'Arg list too long',
-    {{{ cDefs.ENOEXEC }}}: 'Exec format error',
-    {{{ cDefs.EBADF }}}: 'Bad file number',
-    {{{ cDefs.ECHILD }}}: 'No children',
-    {{{ cDefs.EWOULDBLOCK }}}: 'No more processes',
-    {{{ cDefs.ENOMEM }}}: 'Not enough core',
-    {{{ cDefs.EACCES }}}: 'Permission denied',
-    {{{ cDefs.EFAULT }}}: 'Bad address',
-    {{{ cDefs.ENOTBLK }}}: 'Block device required',
-    {{{ cDefs.EBUSY }}}: 'Mount device busy',
-    {{{ cDefs.EEXIST }}}: 'File exists',
-    {{{ cDefs.EXDEV }}}: 'Cross-device link',
-    {{{ cDefs.ENODEV }}}: 'No such device',
-    {{{ cDefs.ENOTDIR }}}: 'Not a directory',
-    {{{ cDefs.EISDIR }}}: 'Is a directory',
-    {{{ cDefs.EINVAL }}}: 'Invalid argument',
-    {{{ cDefs.ENFILE }}}: 'Too many open files in system',
-    {{{ cDefs.EMFILE }}}: 'Too many open files',
-    {{{ cDefs.ENOTTY }}}: 'Not a typewriter',
-    {{{ cDefs.ETXTBSY }}}: 'Text file busy',
-    {{{ cDefs.EFBIG }}}: 'File too large',
-    {{{ cDefs.ENOSPC }}}: 'No space left on device',
-    {{{ cDefs.ESPIPE }}}: 'Illegal seek',
-    {{{ cDefs.EROFS }}}: 'Read only file system',
-    {{{ cDefs.EMLINK }}}: 'Too many links',
-    {{{ cDefs.EPIPE }}}: 'Broken pipe',
-    {{{ cDefs.EDOM }}}: 'Math arg out of domain of func',
-    {{{ cDefs.ERANGE }}}: 'Math result not representable',
-    {{{ cDefs.ENOMSG }}}: 'No message of desired type',
-    {{{ cDefs.EIDRM }}}: 'Identifier removed',
-    {{{ cDefs.ECHRNG }}}: 'Channel number out of range',
-    {{{ cDefs.EL2NSYNC }}}: 'Level 2 not synchronized',
-    {{{ cDefs.EL3HLT }}}: 'Level 3 halted',
-    {{{ cDefs.EL3RST }}}: 'Level 3 reset',
-    {{{ cDefs.ELNRNG }}}: 'Link number out of range',
-    {{{ cDefs.EUNATCH }}}: 'Protocol driver not attached',
-    {{{ cDefs.ENOCSI }}}: 'No CSI structure available',
-    {{{ cDefs.EL2HLT }}}: 'Level 2 halted',
-    {{{ cDefs.EDEADLK }}}: 'Deadlock condition',
-    {{{ cDefs.ENOLCK }}}: 'No record locks available',
-    {{{ cDefs.EBADE }}}: 'Invalid exchange',
-    {{{ cDefs.EBADR }}}: 'Invalid request descriptor',
-    {{{ cDefs.EXFULL }}}: 'Exchange full',
-    {{{ cDefs.ENOANO }}}: 'No anode',
-    {{{ cDefs.EBADRQC }}}: 'Invalid request code',
-    {{{ cDefs.EBADSLT }}}: 'Invalid slot',
-    {{{ cDefs.EDEADLOCK }}}: 'File locking deadlock error',
-    {{{ cDefs.EBFONT }}}: 'Bad font file fmt',
-    {{{ cDefs.ENOSTR }}}: 'Device not a stream',
-    {{{ cDefs.ENODATA }}}: 'No data (for no delay io)',
-    {{{ cDefs.ETIME }}}: 'Timer expired',
-    {{{ cDefs.ENOSR }}}: 'Out of streams resources',
-    {{{ cDefs.ENONET }}}: 'Machine is not on the network',
-    {{{ cDefs.ENOPKG }}}: 'Package not installed',
-    {{{ cDefs.EREMOTE }}}: 'The object is remote',
-    {{{ cDefs.ENOLINK }}}: 'The link has been severed',
-    {{{ cDefs.EADV }}}: 'Advertise error',
-    {{{ cDefs.ESRMNT }}}: 'Srmount error',
-    {{{ cDefs.ECOMM }}}: 'Communication error on send',
-    {{{ cDefs.EPROTO }}}: 'Protocol error',
-    {{{ cDefs.EMULTIHOP }}}: 'Multihop attempted',
-    {{{ cDefs.EDOTDOT }}}: 'Cross mount point (not really error)',
-    {{{ cDefs.EBADMSG }}}: 'Trying to read unreadable message',
-    {{{ cDefs.ENOTUNIQ }}}: 'Given log. name not unique',
-    {{{ cDefs.EBADFD }}}: 'f.d. invalid for this operation',
-    {{{ cDefs.EREMCHG }}}: 'Remote address changed',
-    {{{ cDefs.ELIBACC }}}: 'Can   access a needed shared lib',
-    {{{ cDefs.ELIBBAD }}}: 'Accessing a corrupted shared lib',
-    {{{ cDefs.ELIBSCN }}}: '.lib section in a.out corrupted',
-    {{{ cDefs.ELIBMAX }}}: 'Attempting to link in too many libs',
-    {{{ cDefs.ELIBEXEC }}}: 'Attempting to exec a shared library',
-    {{{ cDefs.ENOSYS }}}: 'Function not implemented',
-    {{{ cDefs.ENOTEMPTY }}}: 'Directory not empty',
-    {{{ cDefs.ENAMETOOLONG }}}: 'File or path name too long',
-    {{{ cDefs.ELOOP }}}: 'Too many symbolic links',
-    {{{ cDefs.EOPNOTSUPP }}}: 'Operation not supported on transport endpoint',
-    {{{ cDefs.EPFNOSUPPORT }}}: 'Protocol family not supported',
-    {{{ cDefs.ECONNRESET }}}: 'Connection reset by peer',
-    {{{ cDefs.ENOBUFS }}}: 'No buffer space available',
-    {{{ cDefs.EAFNOSUPPORT }}}: 'Address family not supported by protocol family',
-    {{{ cDefs.EPROTOTYPE }}}: 'Protocol wrong type for socket',
-    {{{ cDefs.ENOTSOCK }}}: 'Socket operation on non-socket',
-    {{{ cDefs.ENOPROTOOPT }}}: 'Protocol not available',
-    {{{ cDefs.ESHUTDOWN }}}: 'Can\'t send after socket shutdown',
-    {{{ cDefs.ECONNREFUSED }}}: 'Connection refused',
-    {{{ cDefs.EADDRINUSE }}}: 'Address already in use',
-    {{{ cDefs.ECONNABORTED }}}: 'Connection aborted',
-    {{{ cDefs.ENETUNREACH }}}: 'Network is unreachable',
-    {{{ cDefs.ENETDOWN }}}: 'Network interface is not configured',
-    {{{ cDefs.ETIMEDOUT }}}: 'Connection timed out',
-    {{{ cDefs.EHOSTDOWN }}}: 'Host is down',
-    {{{ cDefs.EHOSTUNREACH }}}: 'Host is unreachable',
-    {{{ cDefs.EINPROGRESS }}}: 'Connection already in progress',
-    {{{ cDefs.EALREADY }}}: 'Socket already connected',
-    {{{ cDefs.EDESTADDRREQ }}}: 'Destination address required',
-    {{{ cDefs.EMSGSIZE }}}: 'Message too long',
-    {{{ cDefs.EPROTONOSUPPORT }}}: 'Unknown protocol',
-    {{{ cDefs.ESOCKTNOSUPPORT }}}: 'Socket type not supported',
-    {{{ cDefs.EADDRNOTAVAIL }}}: 'Address not available',
-    {{{ cDefs.ENETRESET }}}: 'Connection reset by network',
-    {{{ cDefs.EISCONN }}}: 'Socket is already connected',
-    {{{ cDefs.ENOTCONN }}}: 'Socket is not connected',
-    {{{ cDefs.ETOOMANYREFS }}}: 'Too many references',
-    {{{ cDefs.EUSERS }}}: 'Too many users',
-    {{{ cDefs.EDQUOT }}}: 'Quota exceeded',
-    {{{ cDefs.ESTALE }}}: 'Stale file handle',
-    {{{ cDefs.ENOTSUP }}}: 'Not supported',
-    {{{ cDefs.ENOMEDIUM }}}: 'No medium (in tape drive)',
-    {{{ cDefs.EILSEQ }}}: 'Illegal byte sequence',
-    {{{ cDefs.EOVERFLOW }}}: 'Value too large for defined data type',
-    {{{ cDefs.ECANCELED }}}: 'Operation canceled',
-    {{{ cDefs.ENOTRECOVERABLE }}}: 'State not recoverable',
-    {{{ cDefs.EOWNERDEAD }}}: 'Previous owner died',
-    {{{ cDefs.ESTRPIPE }}}: 'Streams pipe error',
+
+#if PURE_WASI
+  $strError: (errno) => errno + '',
+#else
+  $strError__deps: ['strerror', '$UTF8ToString'],
+  $strError: (errno) => {
+    return UTF8ToString(_strerror(errno));
   },
+#endif
 
 #if PROXY_POSIX_SOCKETS == 0
   // ==========================================================================
@@ -3386,7 +3272,7 @@ function wrapSyscallFunction(x, library, isWasi) {
   pre += "var ret = (() => {";
   post += "})();\n";
   post += "if (ret && ret < 0 && canWarn) {\n";
-  post += "  dbg(`error: syscall may have failed with ${-ret} (${ERRNO_MESSAGES[-ret]})`);\n";
+  post += "  dbg(`error: syscall may have failed with ${-ret} (${strError(-ret)})`);\n";
   post += "}\n";
   post += "dbg(`syscall return: ${ret}`);\n";
   post += "return ret;\n";
@@ -3400,7 +3286,7 @@ function wrapSyscallFunction(x, library, isWasi) {
     "  if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;\n";
 #if SYSCALL_DEBUG
     handler +=
-    "  dbg(`error: syscall failed with ${e.errno} (${ERRNO_MESSAGES[e.errno]})`);\n" +
+    "  dbg(`error: syscall failed with ${e.errno} (${strError(e.errno)})`);\n" +
     "  canWarn = false;\n";
 #endif
     // Musl syscalls are negated.

src/library_fs.js

@@ -28,7 +28,7 @@ addToLibrary({
     '$PROXYFS',
 #endif
 #if ASSERTIONS
-    '$ERRNO_MESSAGES', '$ERRNO_CODES',
+    '$strError', '$ERRNO_CODES',
 #endif
   ],
   $FS__postset: function() {
@@ -80,7 +80,7 @@ FS.staticInit();` +
       // we'll use the reliable test `err.name == "ErrnoError"` instead
       constructor(errno) {
 #if ASSERTIONS
-        super(ERRNO_MESSAGES[errno]);
+        super(runtimeInitialized ? strError(errno) : '');
 #endif
         // TODO(sbc): Use the inline member declaration syntax once we
         // support it in acorn and closure.

src/library_syscall.js

@@ -11,7 +11,7 @@ var SyscallsLibrary = {
                    '$FS',
 #endif
 #if SYSCALL_DEBUG
-                   '$ERRNO_MESSAGES'
+                   '$strError',
 #endif
   ],
   $SYSCALLS: {

system/lib/libc/musl/src/errno/strerror.c

@@ -36,12 +36,24 @@ char *__strerror_l(int e, locale_t loc)
 #endif
 	if (e >= sizeof errmsgidx / sizeof *errmsgidx) e = 0;
 	s = (char *)&errmsgstr + errmsgidx[e];
+#ifdef __EMSCRIPTEN__
+	// strerror is a (debug) dependency of many emscripten syscalls which mean it
+	// must be excluded from LTO, along with all of its dependencies.
+	// In order to limit the transitive dependencies we disable localization of
+	// rrno messages here.
+	return (char *)s;
+#else
 	return (char *)LCTRANS(s, LC_MESSAGES, loc);
+#endif
 }
 
 char *strerror(int e)
 {
+#ifdef __EMSCRIPTEN__
+	return __strerror_l(e, NULL);
+#else
 	return __strerror_l(e, CURRENT_LOCALE);
+#endif
 }
 
 weak_alias(__strerror_l, strerror_l);

test/other/metadce/test_metadce_hello_O0.gzsize

@@ -1 +1 @@
-8017
+8014

test/other/metadce/test_metadce_hello_O0.jssize

@@ -1 +1 @@
-21507
+21501

test/other/metadce/test_metadce_minimal_O0.gzsize

@@ -1 +1 @@
-6584
+6581

test/other/metadce/test_metadce_minimal_O0.jssize

@@ -1 +1 @@
-17647
+17641

test/other/test_unoptimized_code_size.js.size

@@ -1 +1 @@
-55036
+55030

test/other/test_unoptimized_code_size_strict.js.size

@@ -1 +1 @@
-53933
+53927

tools/system_libs.py

@@ -1070,9 +1070,10 @@ def get_libcall_files(self):
       path='system/lib/libc/musl/src/string',
       filenames=['strlen.c'])
 
+    # Transitively required my message system call imports
     errno_files = files_in_path(
       path='system/lib/libc/musl/src/errno',
-      filenames=['__errno_location.c'])
+      filenames=['__errno_location.c', 'strerror.c'])
 
     return math_files + exit_files + other_files + iprintf_files + errno_files