[nodefs] Remove compatibility code for ancient node versions (#23316)

Author: hoodmane

.circleci/config.yml

@@ -766,14 +766,66 @@ jobs:
       - run-tests:
           title: "node (oldest / 10.19.0)"
           extra-cflags: "-sMIN_NODE_VERSION=101900"
+          # We include most but not all of the nodefs and node rawfs tests here.
+          # test_fs_nodefs_rw, test_fs_nodefs_statvfs, and test_unistd_io_nodefs_bigint fail.
           test_targets: "
             other.test_gen_struct_info
             other.test_native_call_before_init
             other.test_js_optimizer_verbose
             other.test_node_unhandled_rejection
             other.test_full_js_library*
             core2.test_hello_world
-            core2.test_fs_write_rawfs"
+            core2.test_fcntl_open_nodefs
+            core2.test_fcntl_open_rawfs
+            core2.test_fgetc_ungetc_nodefs
+            core2.test_fgetc_ungetc_rawfs
+            core2.test_fs_append_rawfs
+            core2.test_fs_emptyPath_rawfs
+            core2.test_fs_enotdir_nodefs
+            core2.test_fs_enotdir_rawfs
+            core2.test_fs_errorstack_rawfs
+            core2.test_fs_llseek_rawfs
+            core2.test_fs_mkdir_dotdot_nodefs
+            core2.test_fs_mkdir_dotdot_rawfs
+            core2.test_fs_mmap_nodefs
+            core2.test_fs_mmap_rawfs
+            core2.test_fs_nodefs_cloexec
+            core2.test_fs_nodefs_cloexec_rawfs
+            core2.test_fs_nodefs_dup
+            core2.test_fs_nodefs_dup_rawfs
+            core2.test_fs_nodefs_home
+            core2.test_fs_nodefs_nofollow
+            core2.test_fs_nodefs_readdir
+            core2.test_fs_noderawfs_nofollow
+            core2.test_fs_readdir_ino_matches_stat_ino_nodefs
+            core2.test_fs_readdir_ino_matches_stat_ino_rawfs
+            core2.test_fs_readv_rawfs
+            core2.test_fs_rename_on_existing_nodefs
+            core2.test_fs_rename_on_existing_rawfs
+            core2.test_fs_symlink_resolution_nodefs
+            core2.test_fs_symlink_resolution_rawfs
+            core2.test_fs_writeFile_rawfs
+            core2.test_fs_writeFile_wasmfs_rawfs
+            core2.test_fs_write_rawfs
+            core2.test_fs_writev_rawfs
+            core2.test_futimens_rawfs
+            core2.test_readdir_rawfs
+            core2.test_stat_chmod_rawfs
+            core2.test_unistd_access_nodefs
+            core2.test_unistd_access_rawfs
+            core2.test_unistd_close_rawfs
+            core2.test_unistd_dup_rawfs
+            core2.test_unistd_io_nodefs
+            core2.test_unistd_links_nodefs
+            core2.test_unistd_misc_nodefs
+            core2.test_unistd_pipe_rawfs
+            core2.test_unistd_symlink_on_nodefs
+            core2.test_unistd_truncate_nodefs
+            core2.test_unistd_truncate_rawfs
+            core2.test_unistd_unlink_nodefs
+            core2.test_unistd_unlink_rawfs
+            core2.test_unistd_write_broken_link_rawfs
+            "
       # Run a few test with the most recent version of node
       # In particular we have some tests that require node flags on older
       # versions of node but not with the most recent version.

src/closure-externs/node-externs.js

@@ -126,6 +126,11 @@ fs.Stats.prototype.mtimeMs;
  */
 fs.Stats.prototype.ctimeMs;
 
+/**
+ * @type {number}
+ */
+fs.Stats.prototype.blksize;
+
 /**
  * @param {string} p
  * @return {boolean}

src/library_nodefs.js

@@ -19,11 +19,7 @@ addToLibrary({
     isWindows: false,
     staticInit() {
       NODEFS.isWindows = !!process.platform.match(/^win/);
-      var flags = process.binding("constants");
-      // Node.js 4 compatibility: it has no namespaces for constants
-      if (flags["fs"]) {
-        flags = flags["fs"];
-      }
+      var flags = process.binding("constants")["fs"];
       NODEFS.flagsForNodeMap = {
         "{{{ cDefs.O_APPEND }}}": flags["O_APPEND"],
         "{{{ cDefs.O_CREAT }}}": flags["O_CREAT"],
@@ -123,15 +119,6 @@ addToLibrary({
         var stat;
         NODEFS.tryFSOperation(() => stat = fs.lstatSync(path));
         if (NODEFS.isWindows) {
-          // node.js v0.10.20 doesn't report blksize and blocks on Windows. Fake
-          // them with default blksize of 4096.
-          // See http://support.microsoft.com/kb/140365
-          if (!stat.blksize) {
-            stat.blksize = 4096;
-          }
-          if (!stat.blocks) {
-            stat.blocks = (stat.size+stat.blksize-1)/stat.blksize|0;
-          }
           // Windows does not report the 'x' permission bit, so propagate read
           // bits to execute bits.
           stat.mode |= (stat.mode & {{{ cDefs.S_IRUGO }}}) >> 2;
@@ -261,8 +248,6 @@ addToLibrary({
         stream.shared.refcount++;
       },
       read(stream, buffer, offset, length, position) {
-        // Node.js < 6 compatibility: node errors on 0 length reads
-        if (length === 0) return 0;
         return NODEFS.tryFSOperation(() =>
           fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position)
         );

test/other/codesize/test_codesize_cxx_ctors1.jssize

@@ -1 +1 @@
-20272
+20283

test/other/codesize/test_codesize_cxx_ctors2.gzsize

@@ -1 +1 @@
-8334
+8332

test/other/codesize/test_codesize_cxx_ctors2.jssize

@@ -1 +1 @@
-20240
+20251

test/other/codesize/test_codesize_cxx_except.jssize

@@ -1 +1 @@
-24040
+24051

test/other/codesize/test_codesize_cxx_except_wasm.gzsize

@@ -1 +1 @@
-8296
+8298

test/other/codesize/test_codesize_cxx_except_wasm.jssize

@@ -1 +1 @@
-20165
+20176

test/other/codesize/test_codesize_cxx_except_wasm_exnref.gzsize

@@ -1 +1 @@
-8296
+8298