Update Binaryen to latest; Various fixes

lib/loader/index.js

@@ -152,6 +152,30 @@ function postInstantiate(baseModule, instance) {
 
   baseModule.freeArray = freeArray;
 
+  // Reference the table and remember where to insert the next function
+  var table = exports.table;
+
+  /** Creates a new function in the module's table and returns its pointer. */
+  function newFunction(fn) {
+    var index = table.length;
+    table.grow(1);
+    table.set(index, fn);
+    return index;
+  }
+
+  baseModule.newFunction = newFunction;
+
+  /** Gets a function by its pointer. */
+  function getFunction(ptr) {
+    var fn = table.get(ptr);
+    return (...args) => {
+      exports._setargc(args.length);
+      return fn(...args);
+    };
+  }
+
+  baseModule.getFunction = getFunction;
+
   // Demangle exports and provide the usual utility on the prototype
   return demangle(instance.exports, Object.defineProperties(baseModule, {
     I8: { get: function() { checkMem(); return I8; } },
@@ -240,7 +264,9 @@ function demangle(exports, baseModule) {
             enumerable: true
           });
         }
-      } else curr[name] = function(...args) { return elem(this.this, ...args); };
+      } else {
+        curr[name] = wrapFunction(elem);
+      }
     } else {
       if (/^(get|set):/.test(name)) {
         if (!hasOwnProperty(curr, name = name.substring(4))) {
@@ -250,9 +276,25 @@ function demangle(exports, baseModule) {
             enumerable: true
           });
         }
-      } else curr[name] = elem;
+      } else if (typeof elem === "function") {
+        curr[name] = wrapFunction(elem);
+      } else {
+        curr[name] = elem;
+      }
     }
   }
+
+  function wrapFunction(fn) {
+    var ret = function(...args) {
+      exports._setargc(args.length);
+      return fn(...args);
+    };
+    // adding a function to the table with `newFunction` is limited to actual exported WebAssembly
+    // functions, hence we can't use the wrapper for that and instead need to pass a workaround:
+    ret.constructor = fn;
+    return ret;
+  }
+
   return module;
 }