Add Module['scriptDirectory'] to fix loading files that should be relative to main .js file on Node.js.

Author: juj

emcc.py

@@ -2413,6 +2413,8 @@ def generate_html(target, options, js_target, target_basename,
             } else if (Module['memoryInitializerPrefixURL']) {
               memoryInitializer = Module['memoryInitializerPrefixURL'] + memoryInitializer;
             }
+            // If URL to memory initializer is relative, treat it relative with respect to Module['scriptDirectory'], if that is present.
+            if (Module['scriptDirectory'] && !/^(?:[a-z]+:)?\/\//i.test(memoryInitializer)) memoryInitializer = Module['scriptDirectory'] + memoryInitializer;
             var meminitXHR = Module['memoryInitializerRequest'] = new XMLHttpRequest();
             meminitXHR.open('GET', memoryInitializer, true);
             meminitXHR.responseType = 'arraybuffer';

src/Fetch.js

@@ -115,6 +115,7 @@ var Fetch = {
       // of these are passed, then the default URL 'pthread-main.js' relative to the main html file is loaded.
       if (typeof Module['locateFile'] === 'function') fetchJs = Module['locateFile'](fetchJs);
       else if (Module['pthreadMainPrefixURL']) fetchJs = Module['pthreadMainPrefixURL'] + fetchJs;
+      fetchJs = joinUrl(Module['scriptDirectory'], fetchJs);
       Fetch.worker = new Worker(fetchJs);
       Fetch.worker.onmessage = function(e) {
         Module['print']('fetch-worker sent a message: ' + e.filename + ':' + e.lineno + ': ' + e.message);

src/library_debugger_toolkit.js

@@ -451,6 +451,7 @@ var CyberDWARFHeapPrinter = function(cdFileLocation) {
     } else if (Module['cdInitializerPrefixURL']) {
       cdFileLocation = Module['cdInitializerPrefixURL'] + cdFileLocation;
     }
+    cdFileLocation = joinUrl(Module['scriptDirectory'], cdFileLocation);
     if (ENVIRONMENT_IS_NODE || ENVIRONMENT_IS_SHELL) {
       var data = Module['read'](cdFileLocation);
       install_cyberdwarf(data);

src/library_pthread.js

@@ -259,6 +259,7 @@ var LibraryPThread = {
         // of these are passed, then the default URL 'pthread-main.js' relative to the main html file is loaded.
         if (typeof Module['locateFile'] === 'function') pthreadMainJs = Module['locateFile'](pthreadMainJs);
         else if (Module['pthreadMainPrefixURL']) pthreadMainJs = Module['pthreadMainPrefixURL'] + pthreadMainJs;
+        pthreadMainJs = joinUrl(Module['scriptDirectory'], pthreadMainJs);
         var worker = new Worker(pthreadMainJs);
 
         worker.onmessage = function(e) {

src/postamble.js

@@ -44,6 +44,8 @@ if (memoryInitializer) {
   } else if (Module['memoryInitializerPrefixURL']) {
     memoryInitializer = Module['memoryInitializerPrefixURL'] + memoryInitializer;
   }
+  memoryInitializer = joinUrl(Module['scriptDirectory'], memoryInitializer);
+
   if (ENVIRONMENT_IS_NODE || ENVIRONMENT_IS_SHELL) {
     var data = Module['readBinary'](memoryInitializer);
     HEAPU8.set(data, Runtime.GLOBAL_BASE);

src/preamble.js

@@ -932,6 +932,16 @@ function stackTrace() {
 }
 {{{ maybeExport('stackTrace') }}}
 
+function isAbsoluteUrl(url) {
+  return /^(?:[a-z]+:)?\/\//i.test(url);
+}
+
+function joinUrl(a, b) {
+#if ASSERTIONS
+  if (a && !a.endsWith('/')) throw 'First parameter to joinUrl() should end in /'!;
+#endif
+  return a && !isAbsoluteUrl(b) ? a + b : b;
+}
 // Memory management
 
 var PAGE_SIZE = 16384;
@@ -2114,6 +2124,9 @@ function integrateWasmJS(Module) {
     wasmBinaryFile = Module['locateFile'](wasmBinaryFile);
     asmjsCodeFile = Module['locateFile'](asmjsCodeFile);
   }
+  wasmTextFile = joinUrl(Module['scriptDirectory'], wasmTextFile);
+  wasmBinaryFile = joinUrl(Module['scriptDirectory'], wasmBinaryFile);
+  asmjsCodeFile = joinUrl(Module['scriptDirectory'], asmjsCodeFile);
 
   // utilities
 

src/shell.js

@@ -76,6 +76,7 @@ if (ENVIRONMENT_IS_NODE) {
   // Note that we pollute the global namespace here, otherwise we break in node
   if (!Module['print']) Module['print'] = console.log;
   if (!Module['printErr']) Module['printErr'] = console.warn;
+  if (!Module['scriptDirectory']) Module['scriptDirectory'] = __dirname + '/';
 
   var nodeFS;
   var nodePath;

tools/file_packager.py

@@ -833,6 +833,7 @@ def was_seen(name):
  var REMOTE_METADATA_NAME = typeof Module['locateFile'] === 'function' ?
                             Module['locateFile']('%(metadata_file)s') :
                             ((Module['filePackagePrefixURL'] || '') + '%(metadata_file)s');
+ REMOTE_METADATA_NAME = joinUrl(Module['scriptDirectory'], REMOTE_METADATA_NAME);
  var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function() {
   if (xhr.readyState === 4 && xhr.status === 200) {