export global constructors from asm.js and get them dynamically in the outside scope

emscripten.py

@@ -128,10 +128,12 @@ def emscript(infile, settings, outfile, libraries=[]):
 
   # Save settings to a file to work around v8 issue 1579
   settings_file = temp_files.get('.txt').name
-  settings_text = json.dumps(settings)
-  s = open(settings_file, 'w')
-  s.write(settings_text)
-  s.close()
+  def save_settings():
+    settings_text = json.dumps(settings)
+    s = open(settings_file, 'w')
+    s.write(settings_text)
+    s.close()
+  save_settings()
 
   # Phase 1 - pre
   if DEBUG: t = time.time()
@@ -169,6 +171,9 @@ def emscript(infile, settings, outfile, libraries=[]):
   if DEBUG: t = time.time()
   forwarded_json = json.loads(forwarded_data)
   indexed_functions = set()
+  if settings.get('ASM_JS'):
+    settings['EXPORTED_FUNCTIONS'] = forwarded_json['EXPORTED_FUNCTIONS']
+    save_settings()
 
   chunks = shared.JCache.chunkify(funcs, chunk_size, 'emscript_files' if jcache else None)
 
@@ -293,6 +298,7 @@ def emscript(infile, settings, outfile, libraries=[]):
       exports.append("'%s': %s" % (export, export))
     exports = '{ ' + ', '.join(exports) + ' }'
     # calculate globals
+    del forwarded_json['Variables']['globals']['_llvm_global_ctors'] # not a true variable
     global_vars = forwarded_json['Variables']['globals'].keys()
     global_funcs = ['_' + x for x in forwarded_json['Functions']['libraryFunctions'].keys()]
     asm_globals = ''.join(['  var ' + g + '=env.' + g + ';\n' for g in basics + global_funcs + global_vars])

src/intertyper.js

@@ -521,7 +521,12 @@ function intertyper(data, sidePass, baseLineNums) {
           if (item.tokens[3].item) {
             var subTokens = item.tokens[3].item.tokens;
             splitTokenList(subTokens).forEach(function(segment) {
-              ret.ctors.push(segment[1].tokens.slice(-1)[0].text);
+              var ctor = toNiceIdent(segment[1].tokens.slice(-1)[0].text);
+              ret.ctors.push(ctor);
+              if (ASM_JS) { // must export the global constructors from asm.js module, so mark as implemented and exported
+                Functions.implementedFunctions[ctor] = 'v';
+                EXPORTED_FUNCTIONS[ctor] = 1;
+              }
             });
           }
         } else if (!external) {

src/jsifier.js

@@ -260,7 +260,7 @@ function JSify(data, functionsOnly, givenFunctions) {
       var ret = [item];
       if (item.ident == '_llvm_global_ctors') {
         item.JS = '\n__ATINIT__ = __ATINIT__.concat([\n' +
-                    item.ctors.map(function(ctor) { return '  { func: ' + toNiceIdent(ctor) + ' }' }).join(',\n') +
+                    item.ctors.map(function(ctor) { return '  { func: function() { ' + ctor + '() } }' }).join(',\n') +
                   '\n]);\n';
         return ret;
       } else {

src/modules.js

@@ -348,7 +348,8 @@ var PassManager = {
       print('\n//FORWARDED_DATA:' + JSON.stringify({
         Types: Types,
         Variables: Variables,
-        Functions: Functions
+        Functions: Functions,
+        EXPORTED_FUNCTIONS: EXPORTED_FUNCTIONS // needed for asm.js global constructors (ctors)
       }));
     } else if (phase == 'funcs') {
       print('\n//FORWARDED_DATA:' + JSON.stringify({