@nat-lang/nat/lib/nat.js

wasm compiler for nat

// This code implements the `-sMODULARIZE` settings by taking the generated
// JS program code (INNER_JS_CODE) and wrapping it in a factory function.

// When targetting node and ES6 we use `await import ..` in the generated code
// so the outer function needs to be marked as async.
async function Module(moduleArg = {}) {
  var moduleRtn;

// include: shell.js
// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(moduleArg) => Promise<Module>
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define   var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
var Module = moduleArg;

// Determine the runtime environment we are in. You can customize this by
// setting the ENVIRONMENT setting at compile time (see settings.js).

// Attempt to auto-detect the environment
var ENVIRONMENT_IS_WEB = typeof window == 'object';
var ENVIRONMENT_IS_WORKER = typeof WorkerGlobalScope != 'undefined';
// N.b. Electron.js environment is simultaneously a NODE-environment, but
// also a web environment.
var ENVIRONMENT_IS_NODE = typeof process == 'object' && process.versions?.node && process.type != 'renderer';
var ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE && !ENVIRONMENT_IS_WORKER;

if (ENVIRONMENT_IS_NODE) {
  // When building an ES module `require` is not normally available.
  // We need to use `createRequire()` to construct the require()` function.
  const { createRequire } = await import('module');
  /** @suppress{duplicate} */
  var require = createRequire(import.meta.url);

}

// --pre-jses are emitted after the Module integration code, so that they can
// refer to Module (if they choose; they can also define Module)


var arguments_ = [];
var thisProgram = './this.program';
var quit_ = (status, toThrow) => {
  throw toThrow;
};

var _scriptName = import.meta.url;

// `/` should be present at the end if `scriptDirectory` is not empty
var scriptDirectory = '';
function locateFile(path) {
  if (Module['locateFile']) {
    return Module['locateFile'](path, scriptDirectory);
  }
  return scriptDirectory + path;
}

// Hooks that are implemented differently in different runtime environments.
var readAsync, readBinary;

if (ENVIRONMENT_IS_NODE) {
  const isNode = typeof process == 'object' && process.versions?.node && process.type != 'renderer';
  if (!isNode) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');

  var nodeVersion = process.versions.node;
  var numericVersion = nodeVersion.split('.').slice(0, 3);
  numericVersion = (numericVersion[0] * 10000) + (numericVersion[1] * 100) + (numericVersion[2].split('-')[0] * 1);
  if (numericVersion < 160000) {
    throw new Error('This emscripten-generated code requires node v16.0.0 (detected v' + nodeVersion + ')');
  }

  // These modules will usually be used on Node.js. Load them eagerly to avoid
  // the complexity of lazy-loading.
  var fs = require('fs');

  if (_scriptName.startsWith('file:')) {
    scriptDirectory = require('path').dirname(require('url').fileURLToPath(_scriptName)) + '/';
  }

// include: node_shell_read.js
readBinary = (filename) => {
  // We need to re-wrap `file://` strings to URLs.
  filename = isFileURI(filename) ? new URL(filename) : filename;
  var ret = fs.readFileSync(filename);
  assert(Buffer.isBuffer(ret));
  return ret;
};

readAsync = async (filename, binary = true) => {
  // See the comment in the `readBinary` function.
  filename = isFileURI(filename) ? new URL(filename) : filename;
  var ret = fs.readFileSync(filename, binary ? undefined : 'utf8');
  assert(binary ? Buffer.isBuffer(ret) : typeof ret == 'string');
  return ret;
};
// end include: node_shell_read.js
  if (process.argv.length > 1) {
    thisProgram = process.argv[1].replace(/\\/g, '/');
  }

  arguments_ = process.argv.slice(2);

  quit_ = (status, toThrow) => {
    process.exitCode = status;
    throw toThrow;
  };

} else
if (ENVIRONMENT_IS_SHELL) {

  const isNode = typeof process == 'object' && process.versions?.node && process.type != 'renderer';
  if (isNode || typeof window == 'object' || typeof WorkerGlobalScope != 'undefined') throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');

} else

// Note that this includes Node.js workers when relevant (pthreads is enabled).
// Node.js workers are detected as a combination of ENVIRONMENT_IS_WORKER and
// ENVIRONMENT_IS_NODE.
if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
  try {
    scriptDirectory = new URL('.', _scriptName).href; // includes trailing slash
  } catch {
    // Must be a `blob:` or `data:` URL (e.g. `blob:http://site.com/etc/etc`), we cannot
    // infer anything from them.
  }

  if (!(typeof window == 'object' || typeof WorkerGlobalScope != 'undefined')) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');

  {
// include: web_or_worker_shell_read.js
if (ENVIRONMENT_IS_WORKER) {
    readBinary = (url) => {
      var xhr = new XMLHttpRequest();
      xhr.open('GET', url, false);
      xhr.responseType = 'arraybuffer';
      xhr.send(null);
      return new Uint8Array(/** @type{!ArrayBuffer} */(xhr.response));
    };
  }

  readAsync = async (url) => {
    // Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
    // See https://github.com/github/fetch/pull/92#issuecomment-140665932
    // Cordova or Electron apps are typically loaded from a file:// url.
    // So use XHR on webview if URL is a file URL.
    if (isFileURI(url)) {
      return new Promise((resolve, reject) => {
        var xhr = new XMLHttpRequest();
        xhr.open('GET', url, true);
        xhr.responseType = 'arraybuffer';
        xhr.onload = () => {
          if (xhr.status == 200 || (xhr.status == 0 && xhr.response)) { // file URLs can return 0
            resolve(xhr.response);
            return;
          }
          reject(xhr.status);
        };
        xhr.onerror = reject;
        xhr.send(null);
      });
    }
    var response = await fetch(url, { credentials: 'same-origin' });
    if (response.ok) {
      return response.arrayBuffer();
    }
    throw new Error(response.status + ' : ' + response.url);
  };
// end include: web_or_worker_shell_read.js
  }
} else
{
  throw new Error('environment detection error');
}

var out = console.log.bind(console);
var err = console.error.bind(console);

var IDBFS = 'IDBFS is no longer included by default; build with -lidbfs.js';
var PROXYFS = 'PROXYFS is no longer included by default; build with -lproxyfs.js';
var WORKERFS = 'WORKERFS is no longer included by default; build with -lworkerfs.js';
var FETCHFS = 'FETCHFS is no longer included by default; build with -lfetchfs.js';
var ICASEFS = 'ICASEFS is no longer included by default; build with -licasefs.js';
var JSFILEFS = 'JSFILEFS is no longer included by default; build with -ljsfilefs.js';
var OPFS = 'OPFS is no longer included by default; build with -lopfs.js';

var NODEFS = 'NODEFS is no longer included by default; build with -lnodefs.js';

// perform assertions in shell.js after we set up out() and err(), as otherwise
// if an assertion fails it cannot print the message

assert(!ENVIRONMENT_IS_SHELL, 'shell environment detected but not enabled at build time.  Add `shell` to `-sENVIRONMENT` to enable.');

// end include: shell.js

// include: preamble.js
// === Preamble library stuff ===

// Documentation for the public APIs defined in this file must be updated in:
//    site/source/docs/api_reference/preamble.js.rst
// A prebuilt local version of the documentation is available at:
//    site/build/text/docs/api_reference/preamble.js.txt
// You can also build docs locally as HTML or other formats in site/
// An online HTML version (which may be of a different version of Emscripten)
//    is up at http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html

var wasmBinary;

if (typeof WebAssembly != 'object') {
  err('no native wasm support detected');
}

// Wasm globals

//========================================
// Runtime essentials
//========================================

// whether we are quitting the application. no code should run after this.
// set in exit() and abort()
var ABORT = false;

// set by exit() and abort().  Passed to 'onExit' handler.
// NOTE: This is also used as the process return code code in shell environments
// but only when noExitRuntime is false.
var EXITSTATUS;

// In STRICT mode, we only define assert() when ASSERTIONS is set.  i.e. we
// don't define it at all in release modes.  This matches the behaviour of
// MINIMAL_RUNTIME.
// TODO(sbc): Make this the default even without STRICT enabled.
/** @type {function(*, string=)} */
function assert(condition, text) {
  if (!condition) {
    abort('Assertion failed' + (text ? ': ' + text : ''));
  }
}

// We used to include malloc/free by default in the past. Show a helpful error in
// builds with assertions.
function _malloc() {
  abort('malloc() called but not included in the build - add `_malloc` to EXPORTED_FUNCTIONS');
}
function _free() {
  // Show a helpful error since we used to include free by default in the past.
  abort('free() called but not included in the build - add `_free` to EXPORTED_FUNCTIONS');
}

/**
 * Indicates whether filename is delivered via file protocol (as opposed to http/https)
 * @noinline
 */
var isFileURI = (filename) => filename.startsWith('file://');

// include: runtime_common.js
// include: runtime_stack_check.js
// Initializes the stack cookie. Called at the startup of main and at the startup of each thread in pthreads mode.
function writeStackCookie() {
  var max = _emscripten_stack_get_end();
  assert((max & 3) == 0);
  // If the stack ends at address zero we write our cookies 4 bytes into the
  // stack.  This prevents interference with SAFE_HEAP and ASAN which also
  // monitor writes to address zero.
  if (max == 0) {
    max += 4;
  }
  // The stack grow downwards towards _emscripten_stack_get_end.
  // We write cookies to the final two words in the stack and detect if they are
  // ever overwritten.
  HEAPU32[((max)>>2)] = 0x02135467;
  HEAPU32[(((max)+(4))>>2)] = 0x89BACDFE;
  // Also test the global address 0 for integrity.
  HEAPU32[((0)>>2)] = 1668509029;
}

function checkStackCookie() {
  if (ABORT) return;
  var max = _emscripten_stack_get_end();
  // See writeStackCookie().
  if (max == 0) {
    max += 4;
  }
  var cookie1 = HEAPU32[((max)>>2)];
  var cookie2 = HEAPU32[(((max)+(4))>>2)];
  if (cookie1 != 0x02135467 || cookie2 != 0x89BACDFE) {
    abort(`Stack overflow! Stack cookie has been overwritten at ${ptrToString(max)}, expected hex dwords 0x89BACDFE and 0x2135467, but received ${ptrToString(cookie2)} ${ptrToString(cookie1)}`);
  }
  // Also test the global address 0 for integrity.
  if (HEAPU32[((0)>>2)] != 0x63736d65 /* 'emsc' */) {
    abort('Runtime error: The application has corrupted its heap memory area (address zero)!');
  }
}
// end include: runtime_stack_check.js
// include: runtime_exceptions.js
// end include: runtime_exceptions.js
// include: runtime_debug.js
var runtimeDebug = true; // Switch to false at runtime to disable logging at the right times

// Used by XXXXX_DEBUG settings to output debug messages.
function dbg(...args) {
  if (!runtimeDebug && typeof runtimeDebug != 'undefined') return;
  // TODO(sbc): Make this configurable somehow.  Its not always convenient for
  // logging to show up as warnings.
  console.warn(...args);
}

// Endianness check
(() => {
  var h16 = new Int16Array(1);
  var h8 = new Int8Array(h16.buffer);
  h16[0] = 0x6373;
  if (h8[0] !== 0x73 || h8[1] !== 0x63) abort('Runtime error: expected the system to be little-endian! (Run with -sSUPPORT_BIG_ENDIAN to bypass)');
})();

function consumedModuleProp(prop) {
  if (!Object.getOwnPropertyDescriptor(Module, prop)) {
    Object.defineProperty(Module, prop, {
      configurable: true,
      set() {
        abort(`Attempt to set \`Module.${prop}\` after it has already been processed.  This can happen, for example, when code is injected via '--post-js' rather than '--pre-js'`);

      }
    });
  }
}

function makeInvalidEarlyAccess(name) {
  return () => assert(false, `call to '${name}' via reference taken before Wasm module initialization`);

}

function ignoredModuleProp(prop) {
  if (Object.getOwnPropertyDescriptor(Module, prop)) {
    abort(`\`Module.${prop}\` was supplied but \`${prop}\` not included in INCOMING_MODULE_JS_API`);
  }
}

// forcing the filesystem exports a few things by default
function isExportedByForceFilesystem(name) {
  return name === 'FS_createPath' ||
         name === 'FS_createDataFile' ||
         name === 'FS_createPreloadedFile' ||
         name === 'FS_preloadFile' ||
         name === 'FS_unlink' ||
         name === 'addRunDependency' ||
         // The old FS has some functionality that WasmFS lacks.
         name === 'FS_createLazyFile' ||
         name === 'FS_createDevice' ||
         name === 'removeRunDependency';
}

function missingLibrarySymbol(sym) {

  // Any symbol that is not included from the JS library is also (by definition)
  // not exported on the Module object.
  unexportedRuntimeSymbol(sym);
}

function unexportedRuntimeSymbol(sym) {
  if (!Object.getOwnPropertyDescriptor(Module, sym)) {
    Object.defineProperty(Module, sym, {
      configurable: true,
      get() {
        var msg = `'${sym}' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the Emscripten FAQ)`;
        if (isExportedByForceFilesystem(sym)) {
          msg += '. Alternatively, forcing filesystem support (-sFORCE_FILESYSTEM) can export this for you';
        }
        abort(msg);
      }
    });
  }
}

// end include: runtime_debug.js
var readyPromiseResolve, readyPromiseReject;

// Memory management

var wasmMemory;

var
/** @type {!Int8Array} */
  HEAP8,
/** @type {!Uint8Array} */
  HEAPU8,
/** @type {!Int16Array} */
  HEAP16,
/** @type {!Uint16Array} */
  HEAPU16,
/** @type {!Int32Array} */
  HEAP32,
/** @type {!Uint32Array} */
  HEAPU32,
/** @type {!Float32Array} */
  HEAPF32,
/** @type {!Float64Array} */
  HEAPF64;

// BigInt64Array type is not correctly defined in closure
var
/** not-@type {!BigInt64Array} */
  HEAP64,
/* BigUint64Array type is not correctly defined in closure
/** not-@type {!BigUint64Array} */
  HEAPU64;

var runtimeInitialized = false;



function updateMemoryViews() {
  var b = wasmMemory.buffer;
  HEAP8 = new Int8Array(b);
  HEAP16 = new Int16Array(b);
  HEAPU8 = new Uint8Array(b);
  HEAPU16 = new Uint16Array(b);
  HEAP32 = new Int32Array(b);
  HEAPU32 = new Uint32Array(b);
  HEAPF32 = new Float32Array(b);
  HEAPF64 = new Float64Array(b);
  HEAP64 = new BigInt64Array(b);
  HEAPU64 = new BigUint64Array(b);
}

// include: memoryprofiler.js
// end include: memoryprofiler.js
// end include: runtime_common.js
assert(typeof Int32Array != 'undefined' && typeof Float64Array !== 'undefined' && Int32Array.prototype.subarray != undefined && Int32Array.prototype.set != undefined,
       'JS engine does not provide full typed array support');

function preRun() {
  if (Module['preRun']) {
    if (typeof Module['preRun'] == 'function') Module['preRun'] = [Module['preRun']];
    while (Module['preRun'].length) {
      addOnPreRun(Module['preRun'].shift());
    }
  }
  consumedModuleProp('preRun');
  // Begin ATPRERUNS hooks
  callRuntimeCallbacks(onPreRuns);
  // End ATPRERUNS hooks
}

function initRuntime() {
  assert(!runtimeInitialized);
  runtimeInitialized = true;

  checkStackCookie();

  // Begin ATINITS hooks
  if (!Module['noFSInit'] && !FS.initialized) FS.init();
TTY.init();
  // End ATINITS hooks

  wasmExports['__wasm_call_ctors']();

  // Begin ATPOSTCTORS hooks
  FS.ignorePermissions = false;
  // End ATPOSTCTORS hooks
}

function postRun() {
  checkStackCookie();
   // PThreads reuse the runtime from the main thread.

  if (Module['postRun']) {
    if (typeof Module['postRun'] == 'function') Module['postRun'] = [Module['postRun']];
    while (Module['postRun'].length) {
      addOnPostRun(Module['postRun'].shift());
    }
  }
  consumedModuleProp('postRun');

  // Begin ATPOSTRUNS hooks
  callRuntimeCallbacks(onPostRuns);
  // End ATPOSTRUNS hooks
}

/** @param {string|number=} what */
function abort(what) {
  Module['onAbort']?.(what);

  what = 'Aborted(' + what + ')';
  // TODO(sbc): Should we remove printing and leave it up to whoever
  // catches the exception?
  err(what);

  ABORT = true;

  // Use a wasm runtime error, because a JS error might be seen as a foreign
  // exception, which means we'd run destructors on it. We need the error to
  // simply make the program stop.
  // FIXME This approach does not work in Wasm EH because it currently does not assume
  // all RuntimeErrors are from traps; it decides whether a RuntimeError is from
  // a trap or not based on a hidden field within the object. So at the moment
  // we don't have a way of throwing a wasm trap from JS. TODO Make a JS API that
  // allows this in the wasm spec.

  // Suppress closure compiler warning here. Closure compiler's builtin extern
  // definition for WebAssembly.RuntimeError claims it takes no arguments even
  // though it can.
  // TODO(https://github.com/google/closure-compiler/pull/3913): Remove if/when upstream closure gets fixed.
  /** @suppress {checkTypes} */
  var e = new WebAssembly.RuntimeError(what);

  readyPromiseReject?.(e);
  // Throw the error whether or not MODULARIZE is set because abort is used
  // in code paths apart from instantiation where an exception is expected
  // to be thrown when abort is called.
  throw e;
}

function createExportWrapper(name, nargs) {
  return (...args) => {
    assert(runtimeInitialized, `native function \`${name}\` called before runtime initialization`);
    var f = wasmExports[name];
    assert(f, `exported native function \`${name}\` not found`);
    // Only assert for too many arguments. Too few can be valid since the missing arguments will be zero filled.
    assert(args.length <= nargs, `native function \`${name}\` called with ${args.length} args but expects ${nargs}`);
    return f(...args);
  };
}

var wasmBinaryFile;

function findWasmBinary() {
  if (Module['locateFile']) {
    return locateFile('nat.wasm');
  }
  // Use bundler-friendly `new URL(..., import.meta.url)` pattern; works in browsers too.
  return new URL('nat.wasm', import.meta.url).href;
}

function getBinarySync(file) {
  if (file == wasmBinaryFile && wasmBinary) {
    return new Uint8Array(wasmBinary);
  }
  if (readBinary) {
    return readBinary(file);
  }
  // Throwing a plain string here, even though it not normally adviables since
  // this gets turning into an `abort` in instantiateArrayBuffer.
  throw 'both async and sync fetching of the wasm failed';
}

async function getWasmBinary(binaryFile) {
  // If we don't have the binary yet, load it asynchronously using readAsync.
  if (!wasmBinary) {
    // Fetch the binary using readAsync
    try {
      var response = await readAsync(binaryFile);
      return new Uint8Array(response);
    } catch {
      // Fall back to getBinarySync below;
    }
  }

  // Otherwise, getBinarySync should be able to get it synchronously
  return getBinarySync(binaryFile);
}

async function instantiateArrayBuffer(binaryFile, imports) {
  try {
    var binary = await getWasmBinary(binaryFile);
    var instance = await WebAssembly.instantiate(binary, imports);
    return instance;
  } catch (reason) {
    err(`failed to asynchronously prepare wasm: ${reason}`);

    // Warn on some common problems.
    if (isFileURI(binaryFile)) {
      err(`warning: Loading from a file URI (${binaryFile}) is not supported in most browsers. See https://emscripten.org/docs/getting_started/FAQ.html#how-do-i-run-a-local-webserver-for-testing-why-does-my-program-stall-in-downloading-or-preparing`);
    }
    abort(reason);
  }
}

async function instantiateAsync(binary, binaryFile, imports) {
  if (!binary
      // Don't use streaming for file:// delivered objects in a webview, fetch them synchronously.
      && !isFileURI(binaryFile)
      // Avoid instantiateStreaming() on Node.js environment for now, as while
      // Node.js v18.1.0 implements it, it does not have a full fetch()
      // implementation yet.
      //
      // Reference:
      //   https://github.com/emscripten-core/emscripten/pull/16917
      && !ENVIRONMENT_IS_NODE
     ) {
    try {
      var response = fetch(binaryFile, { credentials: 'same-origin' });
      var instantiationResult = await WebAssembly.instantiateStreaming(response, imports);
      return instantiationResult;
    } catch (reason) {
      // We expect the most common failure cause to be a bad MIME type for the binary,
      // in which case falling back to ArrayBuffer instantiation should work.
      err(`wasm streaming compile failed: ${reason}`);
      err('falling back to ArrayBuffer instantiation');
      // fall back of instantiateArrayBuffer below
    };
  }
  return instantiateArrayBuffer(binaryFile, imports);
}

function getWasmImports() {
  // prepare imports
  return {
    'env': wasmImports,
    'wasi_snapshot_preview1': wasmImports,
  }
}

// Create the wasm instance.
// Receives the wasm imports, returns the exports.
async function createWasm() {
  // Load the wasm module and create an instance of using native support in the JS engine.
  // handle a generated wasm instance, receiving its exports and
  // performing other necessary setup
  /** @param {WebAssembly.Module=} module*/
  function receiveInstance(instance, module) {
    wasmExports = instance.exports;

    

    wasmMemory = wasmExports['memory'];
    Module['wasmMemory'] = wasmMemory;
    assert(wasmMemory, 'memory not found in wasm exports');
    updateMemoryViews();

    assignWasmExports(wasmExports);
    return wasmExports;
  }

  // Prefer streaming instantiation if available.
  // Async compilation can be confusing when an error on the page overwrites Module
  // (for example, if the order of elements is wrong, and the one defining Module is
  // later), so we save Module and check it later.
  var trueModule = Module;
  function receiveInstantiationResult(result) {
    // 'result' is a ResultObject object which has both the module and instance.
    // receiveInstance() will swap in the exports (to Module.asm) so they can be called
    assert(Module === trueModule, 'the Module object should not be replaced during async compilation - perhaps the order of HTML elements is wrong?');
    trueModule = null;
    // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193, the above line no longer optimizes out down to the following line.
    // When the regression is fixed, can restore the above PTHREADS-enabled path.
    return receiveInstance(result['instance']);
  }

  var info = getWasmImports();

  // User shell pages can write their own Module.instantiateWasm = function(imports, successCallback) callback
  // to manually instantiate the Wasm module themselves. This allows pages to
  // run the instantiation parallel to any other async startup actions they are
  // performing.
  // Also pthreads and wasm workers initialize the wasm instance through this
  // path.
  if (Module['instantiateWasm']) {
    return new Promise((resolve, reject) => {
      try {
        Module['instantiateWasm'](info, (mod, inst) => {
          resolve(receiveInstance(mod, inst));
        });
      } catch(e) {
        err(`Module.instantiateWasm callback failed with error: ${e}`);
        reject(e);
      }
    });
  }

  wasmBinaryFile ??= findWasmBinary();
  var result = await instantiateAsync(wasmBinary, wasmBinaryFile, info);
  var exports = receiveInstantiationResult(result);
  return exports;
}

// end include: preamble.js

// Begin JS library code


  class ExitStatus {
      name = 'ExitStatus';
      constructor(status) {
        this.message = `Program terminated with exit(${status})`;
        this.status = status;
      }
    }

  var callRuntimeCallbacks = (callbacks) => {
      while (callbacks.length > 0) {
        // Pass the module as the first argument.
        callbacks.shift()(Module);
      }
    };
  var onPostRuns = [];
  var addOnPostRun = (cb) => onPostRuns.push(cb);

  var onPreRuns = [];
  var addOnPreRun = (cb) => onPreRuns.push(cb);


  
    /**
     * @param {number} ptr
     * @param {string} type
     */
  function getValue(ptr, type = 'i8') {
    if (type.endsWith('*')) type = '*';
    switch (type) {
      case 'i1': return HEAP8[ptr];
      case 'i8': return HEAP8[ptr];
      case 'i16': return HEAP16[((ptr)>>1)];
      case 'i32': return HEAP32[((ptr)>>2)];
      case 'i64': return HEAP64[((ptr)>>3)];
      case 'float': return HEAPF32[((ptr)>>2)];
      case 'double': return HEAPF64[((ptr)>>3)];
      case '*': return HEAPU32[((ptr)>>2)];
      default: abort(`invalid type for getValue: ${type}`);
    }
  }

  var noExitRuntime = true;

  var ptrToString = (ptr) => {
      assert(typeof ptr === 'number');
      // Convert to 32-bit unsigned value
      ptr >>>= 0;
      return '0x' + ptr.toString(16).padStart(8, '0');
    };

  
    /**
     * @param {number} ptr
     * @param {number} value
     * @param {string} type
     */
  function setValue(ptr, value, type = 'i8') {
    if (type.endsWith('*')) type = '*';
    switch (type) {
      case 'i1': HEAP8[ptr] = value; break;
      case 'i8': HEAP8[ptr] = value; break;
      case 'i16': HEAP16[((ptr)>>1)] = value; break;
      case 'i32': HEAP32[((ptr)>>2)] = value; break;
      case 'i64': HEAP64[((ptr)>>3)] = BigInt(value); break;
      case 'float': HEAPF32[((ptr)>>2)] = value; break;
      case 'double': HEAPF64[((ptr)>>3)] = value; break;
      case '*': HEAPU32[((ptr)>>2)] = value; break;
      default: abort(`invalid type for setValue: ${type}`);
    }
  }

  var stackRestore = (val) => __emscripten_stack_restore(val);

  var stackSave = () => _emscripten_stack_get_current();

  var warnOnce = (text) => {
      warnOnce.shown ||= {};
      if (!warnOnce.shown[text]) {
        warnOnce.shown[text] = 1;
        if (ENVIRONMENT_IS_NODE) text = 'warning: ' + text;
        err(text);
      }
    };

  /** @suppress {duplicate } */
  var syscallGetVarargI = () => {
      assert(SYSCALLS.varargs != undefined);
      // the `+` prepended here is necessary to convince the JSCompiler that varargs is indeed a number.
      var ret = HEAP32[((+SYSCALLS.varargs)>>2)];
      SYSCALLS.varargs += 4;
      return ret;
    };
  var syscallGetVarargP = syscallGetVarargI;
  
  
  var PATH = {
  isAbs:(path) => path.charAt(0) === '/',
  splitPath:(filename) => {
        var splitPathRe = /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
        return splitPathRe.exec(filename).slice(1);
      },
  normalizeArray:(parts, allowAboveRoot) => {
        // if the path tries to go above the root, `up` ends up > 0
        var up = 0;
        for (var i = parts.length - 1; i >= 0; i--) {
          var last = parts[i];
          if (last === '.') {
            parts.splice(i, 1);
          } else if (last === '..') {
            parts.splice(i, 1);
            up++;
          } else if (up) {
            parts.splice(i, 1);
            up--;
          }
        }
        // if the path is allowed to go above the root, restore leading ..s
        if (allowAboveRoot) {
          for (; up; up--) {
            parts.unshift('..');
          }
        }
        return parts;
      },
  normalize:(path) => {
        var isAbsolute = PATH.isAbs(path),
            trailingSlash = path.slice(-1) === '/';
        // Normalize the path
        path = PATH.normalizeArray(path.split('/').filter((p) => !!p), !isAbsolute).join('/');
        if (!path && !isAbsolute) {
          path = '.';
        }
        if (path && trailingSlash) {
          path += '/';
        }
        return (isAbsolute ? '/' : '') + path;
      },
  dirname:(path) => {
        var result = PATH.splitPath(path),
            root = result[0],
            dir = result[1];
        if (!root && !dir) {
          // No dirname whatsoever
          return '.';
        }
        if (dir) {
          // It has a dirname, strip trailing slash
          dir = dir.slice(0, -1);
        }
        return root + dir;
      },
  basename:(path) => path && path.match(/([^\/]+|\/)\/*$/)[1],
  join:(...paths) => PATH.normalize(paths.join('/')),
  join2:(l, r) => PATH.normalize(l + '/' + r),
  };
  
  var initRandomFill = () => {
      // This block is not needed on v19+ since crypto.getRandomValues is builtin
      if (ENVIRONMENT_IS_NODE) {
        var nodeCrypto = require('crypto');
        return (view) => nodeCrypto.randomFillSync(view);
      }
  
      return (view) => crypto.getRandomValues(view);
    };
  var randomFill = (view) => {
      // Lazily init on the first invocation.
      (randomFill = initRandomFill())(view);
    };
  
  
  
  var PATH_FS = {
  resolve:(...args) => {
        var resolvedPath = '',
          resolvedAbsolute = false;
        for (var i = args.length - 1; i >= -1 && !resolvedAbsolute; i--) {
          var path = (i >= 0) ? args[i] : FS.cwd();
          // Skip empty and invalid entries
          if (typeof path != 'string') {
            throw new TypeError('Arguments to path.resolve must be strings');
          } else if (!path) {
            return ''; // an invalid portion invalidates the whole thing
          }
          resolvedPath = path + '/' + resolvedPath;
          resolvedAbsolute = PATH.isAbs(path);
        }
        // At this point the path should be resolved to a full absolute path, but
        // handle relative paths to be safe (might happen when process.cwd() fails)
        resolvedPath = PATH.normalizeArray(resolvedPath.split('/').filter((p) => !!p), !resolvedAbsolute).join('/');
        return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
      },
  relative:(from, to) => {
        from = PATH_FS.resolve(from).slice(1);
        to = PATH_FS.resolve(to).slice(1);
        function trim(arr) {
          var start = 0;
          for (; start < arr.length; start++) {
            if (arr[start] !== '') break;
          }
          var end = arr.length - 1;
          for (; end >= 0; end--) {
            if (arr[end] !== '') break;
          }
          if (start > end) return [];
          return arr.slice(start, end - start + 1);
        }
        var fromParts = trim(from.split('/'));
        var toParts = trim(to.split('/'));
        var length = Math.min(fromParts.length, toParts.length);
        var samePartsLength = length;
        for (var i = 0; i < length; i++) {
          if (fromParts[i] !== toParts[i]) {
            samePartsLength = i;
            break;
          }
        }
        var outputParts = [];
        for (var i = samePartsLength; i < fromParts.length; i++) {
          outputParts.push('..');
        }
        outputParts = outputParts.concat(toParts.slice(samePartsLength));
        return outputParts.join('/');
      },
  };
  
  
  var UTF8Decoder = typeof TextDecoder != 'undefined' ? new TextDecoder() : undefined;
  
  var findStringEnd = (heapOrArray, idx, maxBytesToRead, ignoreNul) => {
      var maxIdx = idx + maxBytesToRead;
      if (ignoreNul) return maxIdx;
      // TextDecoder needs to know the byte length in advance, it doesn't stop on
      // null terminator by itself.
      // As a tiny code save trick, compare idx against maxIdx using a negation,
      // so that maxBytesToRead=undefined/NaN means Infinity.
      while (heapOrArray[idx] && !(idx >= maxIdx)) ++idx;
      return idx;
    };
  
  
    /**
     * Given a pointer 'idx' to a null-terminated UTF8-encoded string in the given
     * array that contains uint8 values, returns a copy of that string as a
     * Javascript String object.
     * heapOrArray is either a regular array, or a JavaScript typed array view.
     * @param {number=} idx
     * @param {number=} maxBytesToRead
     * @param {boolean=} ignoreNul - If true, the function will not stop on a NUL character.
     * @return {string}
     */
  var UTF8ArrayToString = (heapOrArray, idx = 0, maxBytesToRead, ignoreNul) => {
  
      var endPtr = findStringEnd(heapOrArray, idx, maxBytesToRead, ignoreNul);
  
      // When using conditional TextDecoder, skip it for short strings as the overhead of the native call is not worth it.
      if (endPtr - idx > 16 && heapOrArray.buffer && UTF8Decoder) {
        return UTF8Decoder.decode(heapOrArray.subarray(idx, endPtr));
      }
      var str = '';
      while (idx < endPtr) {
        // For UTF8 byte structure, see:
        // http://en.wikipedia.org/wiki/UTF-8#Description
        // https://www.ietf.org/rfc/rfc2279.txt
        // https://tools.ietf.org/html/rfc3629
        var u0 = heapOrArray[idx++];
        if (!(u0 & 0x80)) { str += String.fromCharCode(u0); continue; }
        var u1 = heapOrArray[idx++] & 63;
        if ((u0 & 0xE0) == 0xC0) { str += String.fromCharCode(((u0 & 31) << 6) | u1); continue; }
        var u2 = heapOrArray[idx++] & 63;
        if ((u0 & 0xF0) == 0xE0) {
          u0 = ((u0 & 15) << 12) | (u1 << 6) | u2;
        } else {
          if ((u0 & 0xF8) != 0xF0) warnOnce('Invalid UTF-8 leading byte ' + ptrToString(u0) + ' encountered when deserializing a UTF-8 string in wasm memory to a JS string!');
          u0 = ((u0 & 7) << 18) | (u1 << 12) | (u2 << 6) | (heapOrArray[idx++] & 63);
        }
  
        if (u0 < 0x10000) {
          str += String.fromCharCode(u0);
        } else {
          var ch = u0 - 0x10000;
          str += String.fromCharCode(0xD800 | (ch >> 10), 0xDC00 | (ch & 0x3FF));
        }
      }
      return str;
    };
  
  var FS_stdin_getChar_buffer = [];
  
  var lengthBytesUTF8 = (str) => {
      var len = 0;
      for (var i = 0; i < str.length; ++i) {
        // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code
        // unit, not a Unicode code point of the character! So decode
        // UTF16->UTF32->UTF8.
        // See http://unicode.org/faq/utf_bom.html#utf16-3
        var c = str.charCodeAt(i); // possibly a lead surrogate
        if (c <= 0x7F) {
          len++;
        } else if (c <= 0x7FF) {
          len += 2;
        } else if (c >= 0xD800 && c <= 0xDFFF) {
          len += 4; ++i;
        } else {
          len += 3;
        }
      }
      return len;
    };
  
  var stringToUTF8Array = (str, heap, outIdx, maxBytesToWrite) => {
      assert(typeof str === 'string', `stringToUTF8Array expects a string (got ${typeof str})`);
      // Parameter maxBytesToWrite is not optional. Negative values, 0, null,
      // undefined and false each don't write out any bytes.
      if (!(maxBytesToWrite > 0))
        return 0;
  
      var startIdx = outIdx;
      var endIdx = outIdx + maxBytesToWrite - 1; // -1 for string null terminator.
      for (var i = 0; i < str.length; ++i) {
        // For UTF8 byte structure, see http://en.wikipedia.org/wiki/UTF-8#Description
        // and https://www.ietf.org/rfc/rfc2279.txt
        // and https://tools.ietf.org/html/rfc3629
        var u = str.codePointAt(i);
        if (u <= 0x7F) {
          if (outIdx >= endIdx) break;
          heap[outIdx++] = u;
        } else if (u <= 0x7FF) {
          if (outIdx + 1 >= endIdx) break;
          heap[outIdx++] = 0xC0 | (u >> 6);
          heap[outIdx++] = 0x80 | (u & 63);
        } else if (u <= 0xFFFF) {
          if (outIdx + 2 >= endIdx) break;
          heap[outIdx++] = 0xE0 | (u >> 12);
          heap[outIdx++] = 0x80 | ((u >> 6) & 63);
          heap[outIdx++] = 0x80 | (u & 63);
        } else {
          if (outIdx + 3 >= endIdx) break;
          if (u > 0x10FFFF) warnOnce('Invalid Unicode code point ' + ptrToString(u) + ' encountered when serializing a JS string to a UTF-8 string in wasm memory! (Valid unicode code points should be in range 0-0x10FFFF).');
          heap[outIdx++] = 0xF0 | (u >> 18);
          heap[outIdx++] = 0x80 | ((u >> 12) & 63);
          heap[outIdx++] = 0x80 | ((u >> 6) & 63);
          heap[outIdx++] = 0x80 | (u & 63);
          // Gotcha: if codePoint is over 0xFFFF, it is represented as a surrogate pair in UTF-16.
          // We need to manually skip over the second code unit for correct iteration.
          i++;
        }
      }
      // Null-terminate the pointer to the buffer.
      heap[outIdx] = 0;
      return outIdx - startIdx;
    };
  /** @type {function(string, boolean=, number=)} */
  var intArrayFromString = (stringy, dontAddNull, length) => {
      var len = length > 0 ? length : lengthBytesUTF8(stringy)+1;
      var u8array = new Array(len);
      var numBytesWritten = stringToUTF8Array(stringy, u8array, 0, u8array.length);
      if (dontAddNull) u8array.length = numBytesWritten;
      return u8array;
    };
  var FS_stdin_getChar = () => {
      if (!FS_stdin_getChar_buffer.length) {
        var result = null;
        if (ENVIRONMENT_IS_NODE) {
          // we will read data by chunks of BUFSIZE
          var BUFSIZE = 256;
          var buf = Buffer.alloc(BUFSIZE);
          var bytesRead = 0;
  
          // For some reason we must suppress a closure warning here, even though
          // fd definitely exists on process.stdin, and is even the proper way to
          // get the fd of stdin,
          // https://github.com/nodejs/help/issues/2136#issuecomment-523649904
          // This started to happen after moving this logic out of library_tty.js,
          // so it is related to the surrounding code in some unclear manner.
          /** @suppress {missingProperties} */
          var fd = process.stdin.fd;
  
          try {
            bytesRead = fs.readSync(fd, buf, 0, BUFSIZE);
          } catch(e) {
            // Cross-platform differences: on Windows, reading EOF throws an
            // exception, but on other OSes, reading EOF returns 0. Uniformize
            // behavior by treating the EOF exception to return 0.
            if (e.toString().includes('EOF')) bytesRead = 0;
            else throw e;
          }
  
          if (bytesRead > 0) {
            result = buf.slice(0, bytesRead).toString('utf-8');
          }
        } else
        if (typeof window != 'undefined' &&
          typeof window.prompt == 'function') {
          // Browser.
          result = window.prompt('Input: ');  // returns null on cancel
          if (result !== null) {
            result += '\n';
          }
        } else
        {}
        if (!result) {
          return null;
        }
        FS_stdin_getChar_buffer = intArrayFromString(result, true);
      }
      return FS_stdin_getChar_buffer.shift();
    };
  var TTY = {
  ttys:[],
  init() {
        // https://github.com/emscripten-core/emscripten/pull/1555
        // if (ENVIRONMENT_IS_NODE) {
        //   // currently, FS.init does not distinguish if process.stdin is a file or TTY
        //   // device, it always assumes it's a TTY device. because of this, we're forcing
        //   // process.stdin to UTF8 encoding to at least make stdin reading compatible
        //   // with text files until FS.init can be refactored.
        //   process.stdin.setEncoding('utf8');
        // }
      },
  shutdown() {
        // https://github.com/emscripten-core/emscripten/pull/1555
        // if (ENVIRONMENT_IS_NODE) {
        //   // inolen: any idea as to why node -e 'process.stdin.read()' wouldn't exit immediately (with process.stdin being a tty)?
        //   // isaacs: because now it's reading from the stream, you've expressed interest in it, so that read() kicks off a _read() which creates a ReadReq operation
        //   // inolen: I thought read() in that case was a synchronous operation that just grabbed some amount of buffered data if it exists?
        //   // isaacs: it is. but it also triggers a _read() call, which calls readStart() on the handle
        //   // isaacs: do process.stdin.pause() and i'd think it'd probably close the pending call
        //   process.stdin.pause();
        // }
      },
  register(dev, ops) {
        TTY.ttys[dev] = { input: [], output: [], ops: ops };
        FS.registerDevice(dev, TTY.stream_ops);
      },
  stream_ops:{
  open(stream) {
          var tty = TTY.ttys[stream.node.rdev];
          if (!tty) {
            throw new FS.ErrnoError(43);
          }
          stream.tty = tty;
          stream.seekable = false;
        },
  close(stream) {
          // flush any pending line data
          stream.tty.ops.fsync(stream.tty);
        },
  fsync(stream) {
          stream.tty.ops.fsync(stream.tty);
        },
  read(stream, buffer, offset, length, pos /* ignored */) {
          if (!stream.tty || !stream.tty.ops.get_char) {
            throw new FS.ErrnoError(60);
          }
          var bytesRead = 0;
          for (var i = 0; i < length; i++) {
            var result;
            try {
              result = stream.tty.ops.get_char(stream.tty);
            } catch (e) {
              throw new FS.ErrnoError(29);
            }
            if (result === undefined && bytesRead === 0) {
              throw new FS.ErrnoError(6);
            }
            if (result === null || result === undefined) break;
            bytesRead++;
            buffer[offset+i] = result;
          }
          if (bytesRead) {
            stream.node.atime = Date.now();
          }
          return bytesRead;
        },
  write(stream, buffer, offset, length, pos) {
          if (!stream.tty || !stream.tty.ops.put_char) {
            throw new FS.ErrnoError(60);
          }
          try {
            for (var i = 0; i < length; i++) {
              stream.tty.ops.put_char(stream.tty, buffer[offset+i]);
            }
          } catch (e) {
            throw new FS.ErrnoError(29);
          }
          if (length) {
            stream.node.mtime = stream.node.ctime = Date.now();
          }
          return i;
        },
  },
  default_tty_ops:{
  get_char(tty) {
          return FS_stdin_getChar();
        },
  put_char(tty, val) {
          if (val === null || val === 10) {
            out(UTF8ArrayToString(tty.output));
            tty.output = [];
          } else {
            if (val != 0) tty.output.push(val); // val == 0 would cut text output off in the middle.
          }
        },
  fsync(tty) {
          if (tty.output?.length > 0) {
            out(UTF8ArrayToString(tty.output));
            tty.output = [];
          }
        },
  ioctl_tcgets(tty) {
          // typical setting
          return {
            c_iflag: 25856,
            c_oflag: 5,
            c_cflag: 191,
            c_lflag: 35387,
            c_cc: [
              0x03, 0x1c, 0x7f, 0x15, 0x04, 0x00, 0x01, 0x00, 0x11, 0x13, 0x1a, 0x00,
              0x12, 0x0f, 0x17, 0x16, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            ]
          };
        },
  ioctl_tcsets(tty, optional_actions, data) {
          // currently just ignore
          return 0;
        },
  ioctl_tiocgwinsz(tty) {
          return [24, 80];
        },
  },
  default_tty1_ops:{
  put_char(tty, val) {
          if (val === null || val === 10) {
            err(UTF8ArrayToString(tty.output));
            tty.output = [];
          } else {
            if (val != 0) tty.output.push(val);
          }
        },
  fsync(tty) {
          if (tty.output?.length > 0) {
            err(UTF8ArrayToString(tty.output));
            tty.output = [];
          }
        },
  },
  };
  
  
  var mmapAlloc = (size) => {
      abort('internal error: mmapAlloc called but `emscripten_builtin_memalign` native symbol not exported');
    };
  var MEMFS = {
  ops_table:null,
  mount(mount) {
        return MEMFS.createNode(null, '/', 16895, 0);
      },
  createNode(parent, name, mode, dev) {
        if (FS.isBlkdev(mode) || FS.isFIFO(mode)) {
          // no supported
          throw new FS.ErrnoError(63);
        }
        MEMFS.ops_table ||= {
          dir: {
            node: {
              getattr: MEMFS.node_ops.getattr,
              setattr: MEMFS.node_ops.setattr,
              lookup: MEMFS.node_ops.lookup,
              mknod: MEMFS.node_ops.mknod,
              rename: MEMFS.node_ops.rename,
              unlink: MEMFS.node_ops.unlink,
              rmdir: MEMFS.node_ops.rmdir,
              readdir: MEMFS.node_ops.readdir,
              symlink: MEMFS.node_ops.symlink
            },
            stream: {
              llseek: MEMFS.stream_ops.llseek
            }
          },
          file: {
            node: {
              getattr: MEMFS.node_ops.getattr,
              setattr: MEMFS.node_ops.setattr
            },
            stream: {
              llseek: MEMFS.stream_ops.llseek,
              read: MEMFS.stream_ops.read,
              write: MEMFS.stream_ops.write,
              mmap: MEMFS.stream_ops.mmap,
              msync: MEMFS.stream_ops.msync
            }
          },
          link: {
            node: {
              getattr: MEMFS.node_ops.getattr,
              setattr: MEMFS.node_ops.setattr,
              readlink: MEMFS.node_ops.readlink
            },
            stream: {}
          },
          chrdev: {
            node: {
              getattr: MEMFS.node_ops.getattr,
              setattr: MEMFS.node_ops.setattr
            },
            stream: FS.chrdev_stream_ops
          }
        };
        var node = FS.createNode(parent, name, mode, dev);
        if (FS.isDir(node.mode)) {
          node.node_ops = MEMFS.ops_table.dir.node;
          node.stream_ops = MEMFS.ops_table.dir.stream;
          node.contents = {};
        } else if (FS.isFile(node.mode)) {
          node.node_ops = MEMFS.ops_table.file.node;
          node.stream_ops = MEMFS.ops_table.file.stream;
          node.usedBytes = 0; // The actual number of bytes used in the typed array, as opposed to contents.length which gives the whole capacity.
          // When the byte data of the file is populated, this will point to either a typed array, or a normal JS array. Typed arrays are preferred
          // for performance, and used by default. However, typed arrays are not resizable like normal JS arrays are, so there is a small disk size
          // penalty involved for appending file writes that continuously grow a file similar to std::vector capacity vs used -scheme.
          node.contents = null; 
        } else if (FS.isLink(node.mode)) {
          node.node_ops = MEMFS.ops_table.link.node;
          node.stream_ops = MEMFS.ops_table.link.stream;
        } else if (FS.isChrdev(node.mode)) {
          node.node_ops = MEMFS.ops_table.chrdev.node;
          node.stream_ops = MEMFS.ops_table.chrdev.stream;
        }
        node.atime = node.mtime = node.ctime = Date.now();
        // add the new node to the parent
        if (parent) {
          parent.contents[name] = node;
          parent.atime = parent.mtime = parent.ctime = node.atime;
        }
        return node;
      },
  getFileDataAsTypedArray(node) {
        if (!node.contents) return new Uint8Array(0);
        if (node.contents.subarray) return node.contents.subarray(0, node.usedBytes); // Make sure to not return excess unused bytes.
        return new Uint8Array(node.contents);
      },
  expandFileStorage(node, newCapacity) {
        var prevCapacity = node.contents ? node.contents.length : 0;
        if (prevCapacity >= newCapacity) return; // No need to expand, the storage was already large enough.
        // Don't expand strictly to the given requested limit if it's only a very small increase, but instead geometrically grow capacity.
        // For small filesizes (<1MB), perform size*2 geometric increase, but for large sizes, do a much more conservative size*1.125 increase to
        // avoid overshooting the allocation cap by a very large margin.
        var CAPACITY_DOUBLING_MAX = 1024 * 1024;
        newCapacity = Math.max(newCapacity, (prevCapacity * (prevCapacity < CAPACITY_DOUBLING_MAX ? 2.0 : 1.125)) >>> 0);
        if (prevCapacity != 0) newCapacity = Math.max(newCapacity, 256); // At minimum allocate 256b for each file when expanding.
        var oldContents = node.contents;
        node.contents = new Uint8Array(newCapacity); // Allocate new storage.
        if (node.usedBytes > 0) node.contents.set(oldContents.subarray(0, node.usedBytes), 0); // Copy old data over to the new storage.
      },
  resizeFileStorage(node, newSize) {
        if (node.usedBytes == newSize) return;
        if (newSize == 0) {
          node.contents = null; // Fully decommit when requesting a resize to zero.
          node.usedBytes = 0;
        } else {
          var oldContents = node.contents;
          node.contents = new Uint8Array(newSize); // Allocate new storage.
          if (oldContents) {
            node.contents.set(oldContents.subarray(0, Math.min(newSize, node.usedBytes))); // Copy old data over to the new storage.
          }
          node.usedBytes = newSize;
        }
      },
  node_ops:{
  getattr(node) {
          var attr = {};
          // device number