Implementing Spreadsheet XLSX import/export using WebAssembly
Ludovic Dubost
5 years ago
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// Copyright 2015 The Emscripten Authors. All rights reserved.
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// Emscripten is available under two separate licenses, the MIT license and the
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// University of Illinois/NCSA Open Source License. Both these licenses can be
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// found in the LICENSE file.
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// Pthread Web Worker startup routine:
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// This is the entry point file that is loaded first by each Web Worker
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// that executes pthreads on the Emscripten application.
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// Thread-local:
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var threadInfoStruct = 0; // Info area for this thread in Emscripten HEAP (shared). If zero, this worker is not currently hosting an executing pthread.
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var selfThreadId = 0; // The ID of this thread. 0 if not hosting a pthread.
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var parentThreadId = 0; // The ID of the parent pthread that launched this thread.
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var noExitRuntime;
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// performance.now() is specced to return a wallclock time in msecs since that Web Worker/main thread launched. However for pthreads this can cause
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// subtle problems in emscripten_get_now() as this essentially would measure time from pthread_create(), meaning that the clocks between each threads
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// would be wildly out of sync. Therefore sync all pthreads to the clock on the main browser thread, so that different threads see a somewhat
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// coherent clock across each of them (+/- 0.1msecs in testing)
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var __performance_now_clock_drift = 0;
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// Cannot use console.log or console.error in a web worker, since that would risk a browser deadlock! https://bugzilla.mozilla.org/show_bug.cgi?id=1049091
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// Therefore implement custom logging facility for threads running in a worker, which queue the messages to main thread to print.
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var Module = {};
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// These modes need to assign to these variables because of how scoping works in them.
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function threadPrintErr() {
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var text = Array.prototype.slice.call(arguments).join(' ');
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console.error(text);
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console.error(new Error().stack);
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}
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function threadAlert() {
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var text = Array.prototype.slice.call(arguments).join(' ');
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postMessage({cmd: 'alert', text: text, threadId: selfThreadId});
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}
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var err = threadPrintErr;
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this.alert = threadAlert;
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// When using postMessage to send an object, it is processed by the structured clone algorithm.
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// The prototype, and hence methods, on that object is then lost. This function adds back the lost prototype.
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// This does not work with nested objects that has prototypes, but it suffices for WasmSourceMap and WasmOffsetConverter.
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function resetPrototype(constructor, attrs) {
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var object = Object.create(constructor.prototype);
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for (var key in attrs) {
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if (attrs.hasOwnProperty(key)) {
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object[key] = attrs[key];
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}
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}
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return object;
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}
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Module['instantiateWasm'] = function(info, receiveInstance) {
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// Instantiate from the module posted from the main thread.
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// We can just use sync instantiation in the worker.
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var instance = new WebAssembly.Instance(Module['wasmModule'], info);
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// We don't need the module anymore; new threads will be spawned from the main thread.
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Module['wasmModule'] = null;
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receiveInstance(instance); // The second 'module' parameter is intentionally null here, we don't need to keep a ref to the Module object from here.
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return instance.exports;
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};
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this.onmessage = function(e) {
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try {
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if (e.data.cmd === 'load') { // Preload command that is called once per worker to parse and load the Emscripten code.
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// Initialize the global "process"-wide fields:
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Module['DYNAMIC_BASE'] = e.data.DYNAMIC_BASE;
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Module['DYNAMICTOP_PTR'] = e.data.DYNAMICTOP_PTR;
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// Module and memory were sent from main thread
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Module['wasmModule'] = e.data.wasmModule;
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Module['wasmMemory'] = e.data.wasmMemory;
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Module['buffer'] = Module['wasmMemory'].buffer;
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Module['ENVIRONMENT_IS_PTHREAD'] = true;
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if (typeof e.data.urlOrBlob === 'string') {
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importScripts(e.data.urlOrBlob);
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} else {
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var objectUrl = URL.createObjectURL(e.data.urlOrBlob);
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importScripts(objectUrl);
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URL.revokeObjectURL(objectUrl);
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}
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PThread = Module['PThread'];
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HEAPU32 = Module['HEAPU32'];
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if (typeof FS !== 'undefined' && typeof FS.createStandardStreams === 'function') FS.createStandardStreams();
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postMessage({ cmd: 'loaded' });
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} else if (e.data.cmd === 'objectTransfer') {
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PThread.receiveObjectTransfer(e.data);
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} else if (e.data.cmd === 'run') { // This worker was idle, and now should start executing its pthread entry point.
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__performance_now_clock_drift = performance.now() - e.data.time; // Sync up to the clock of the main thread.
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threadInfoStruct = e.data.threadInfoStruct;
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Module['__register_pthread_ptr'](threadInfoStruct, /*isMainBrowserThread=*/0, /*isMainRuntimeThread=*/0); // Pass the thread address inside the asm.js scope to store it for fast access that avoids the need for a FFI out.
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selfThreadId = e.data.selfThreadId;
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parentThreadId = e.data.parentThreadId;
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// Establish the stack frame for this thread in global scope
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// The stack grows downwards
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var max = e.data.stackBase;
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var top = e.data.stackBase + e.data.stackSize;
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Module['applyStackValues'](top, top, max);
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// Call inside asm.js/wasm module to set up the stack frame for this pthread in asm.js/wasm module scope
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Module['establishStackSpace'](e.data.stackBase, e.data.stackBase + e.data.stackSize);
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Module['_emscripten_tls_init']();
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PThread.receiveObjectTransfer(e.data);
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PThread.setThreadStatus(Module['_pthread_self'](), 1/*EM_THREAD_STATUS_RUNNING*/);
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try {
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// pthread entry points are always of signature 'void *ThreadMain(void *arg)'
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// Native codebases sometimes spawn threads with other thread entry point signatures,
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// such as void ThreadMain(void *arg), void *ThreadMain(), or void ThreadMain().
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// That is not acceptable per C/C++ specification, but x86 compiler ABI extensions
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// enable that to work. If you find the following line to crash, either change the signature
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// to "proper" void *ThreadMain(void *arg) form, or try linking with the Emscripten linker
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// flag -s EMULATE_FUNCTION_POINTER_CASTS=1 to add in emulation for this x86 ABI extension.
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var result = Module['dynCall_ii'](e.data.start_routine, e.data.arg);
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} catch(e) {
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if (e === 'Canceled!') {
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PThread.threadCancel();
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return;
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} else if (e === 'SimulateInfiniteLoop' || e === 'pthread_exit') {
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return;
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} else {
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Atomics.store(HEAPU32, (threadInfoStruct + 4 /*C_STRUCTS.pthread.threadExitCode*/ ) >> 2, (e instanceof Module['ExitStatus']) ? e.status : -2 /*A custom entry specific to Emscripten denoting that the thread crashed.*/);
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Atomics.store(HEAPU32, (threadInfoStruct + 0 /*C_STRUCTS.pthread.threadStatus*/ ) >> 2, 1); // Mark the thread as no longer running.
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Module['_emscripten_futex_wake'](threadInfoStruct + 0 /*C_STRUCTS.pthread.threadStatus*/, 0x7FFFFFFF/*INT_MAX*/); // Wake all threads waiting on this thread to finish.
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if (!(e instanceof Module['ExitStatus'])) throw e;
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}
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}
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// The thread might have finished without calling pthread_exit(). If so, then perform the exit operation ourselves.
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// (This is a no-op if explicit pthread_exit() had been called prior.)
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if (!noExitRuntime) PThread.threadExit(result);
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} else if (e.data.cmd === 'cancel') { // Main thread is asking for a pthread_cancel() on this thread.
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if (threadInfoStruct) {
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PThread.threadCancel();
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}
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} else if (e.data.target === 'setimmediate') {
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// no-op
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} else if (e.data.cmd === 'processThreadQueue') {
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if (threadInfoStruct) { // If this thread is actually running?
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Module['_emscripten_current_thread_process_queued_calls']();
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}
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} else {
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err('worker.js received unknown command ' + e.data.cmd);
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console.error(e.data);
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}
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} catch(e) {
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console.error('worker.js onmessage() captured an uncaught exception: ' + e);
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console.error(e.stack);
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throw e;
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}
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};
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// Node.js support
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if (typeof process === 'object' && typeof process.versions === 'object' && typeof process.versions.node === 'string') {
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// Create as web-worker-like an environment as we can.
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self = {
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location: {
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href: __filename
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}
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};
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var onmessage = this.onmessage;
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var nodeWorkerThreads = require('worker_threads');
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Worker = nodeWorkerThreads.Worker;
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var parentPort = nodeWorkerThreads.parentPort;
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parentPort.on('message', function(data) {
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onmessage({ data: data });
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});
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var nodeFS = require('fs');
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var nodeRead = function(filename) {
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return nodeFS.readFileSync(filename, 'utf8');
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};
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function globalEval(x) {
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global.require = require;
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global.Module = Module;
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eval.call(null, x);
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}
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importScripts = function(f) {
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globalEval(nodeRead(f));
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};
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postMessage = function(msg) {
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parentPort.postMessage(msg);
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};
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if (typeof performance === 'undefined') {
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performance = {
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now: function() {
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return Date.now();
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}
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};
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}
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}
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