[Javascript] Fix handling of functions which take void*

Fixes #682

Examples/test-suite/javascript/voidtest_runme.js

@@ -0,0 +1,28 @@
+var voidtest = require("voidtest");
+
+voidtest.globalfunc();
+var f = new voidtest.Foo();
+f.memberfunc();
+
+voidtest.Foo.staticmemberfunc();
+
+if (f.memberfunc() !== (function(){}())) {
+  throw new Error("f.memberfunc() didn't return same result as pure Javascript equivalent");
+}
+
+v1 = voidtest.vfunc1(f);
+v2 = voidtest.vfunc2(f);
+if (!voidtest.test_pointers_equal(v1, v2)) {
+  throw new Error("!voidtest.test_pointers_equal(v1, v2)");
+}
+
+v3 = voidtest.vfunc3(v1);
+if (!voidtest.test_pointers_equal(v3.get_this(), f.get_this())) {
+  throw new Error("!voidtest.test_pointers_equal(v3.get_this(), f.get_this())");
+}
+v4 = voidtest.vfunc1(f);
+if (!voidtest.test_pointers_equal(v4, v1)) {
+  throw new Error("!voidtest.test_pointers_equal(v4, v1)");
+}
+
+v3.memberfunc();

Examples/test-suite/voidtest.i

@@ -9,6 +9,7 @@ class Foo {
 public:
    Foo(void) { }
    void memberfunc(void) { }
+   void* get_this() { return this; }
    static void staticmemberfunc(void) { }
 };
 
@@ -18,4 +19,6 @@ void *vfunc2(Foo *f) { return f; }
 Foo  *vfunc3(void *f) { return (Foo *) f; }
 Foo  *vfunc4(Foo *f) { return f; }
 
+bool test_pointers_equal(void *a, void *b) { return a == b; }
+
 %}