Re: "TypeError: Module.X is not a constructor" while creating C++ object in javascript code after compilation with intermediate bitcode state

Thu, 05 Sep 2019 05:39:56 -0700

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เรื่อง: Re: "TypeError: Module.X is not a constructor" while creating C++ object in _javascript_ code after compilation with intermediate bitcode state
จาก: Pawel
ถึง: emscripten-discuss
สำเนา:


Hi Thomas,

I reproduce it using version 1.36.14.
I cannot use newer versions (>=1.37.0) yet due to required dependencies I'm obligated not to use in my project.

W dniu środa, 4 września 2019 17:53:12 UTC+2 użytkownik Thomas Lively napisał:
Hi Pawel,

I notice that the emscripten version you’re using is quite old. Can you reproduce the issue with the latest version?

On Sep 4, 2019, at 06:38, Pawel <[email protected]> wrote:

Hello All,

I get a TypeError: Module.ClassA is not a constructor error while creating object.
I'm having a simple header class defined in header class_a.h:
namespace MyNamespace
{
  class ClassA
  {
  public:
    ClassA();
    void PrintName();
  };
}

and its implemetation in class_a.cpp
#include <iostream>
#include "class_a.h"
namespace MyNamespace
{
  ClassA::ClassA()
  {
    std::cout << "MyNamespace::ClassA constructor" << std::endl;
  }
  void ClassA::PrintName()
  {
    std::cout << "MyNamespace::ClassA::PrintName method" << std::endl;
  }
}

I described in interface in class_a.idl:
[Prefix="MyNamespace::"]
interface ClassA
{
  void ClassA();
  void PrintName();
};

Next I create glue files with:
python ${EMSCRIPTEN_ROOT}/tools/webidl_binder.py class_a.idl class_a_glue

And glue_wrapper.cpp containing
#include "class_a.h"
#include "class_a_glue.cpp"

Now I'd like to create bitcode
em++ class_a.cpp glue_wrapper.cpp --post-js class_a_glue.js -o class_a.bc
and finally the _javascript_
em++ class_a.bc -o class_a.js

Up to now everything works fine, neither error nor warning reported.

I define simle client.js script creating object and calling method:
var obj = new Module.ClassA();
obj.PrintName();

When I load both class_a.jd and client.js scripts in html I get
client.js:1 Uncaught TypeError: Module.ClassA is not a constructor at client.js:1


The interesting is that, if I create _javascript_ in one step (without intermediate .bc) then it works fine - I see proper printouts in browser console.
I'm however not likely going this way because I've got a bunch of classes I'd like to put into one _javascript_, e.g.

em++ class_a.cpp glue_wrapper.cpp --post-js class_a_glue.js -o class_a.bc
em++ class_b.cpp b_glue_wrapper.cpp --post-js class_b_glue.js -o class_b.bc
em++ class_c.cpp c_glue_wrapper.cpp --post-js class_c_glue.js -o class_c.bc
...
em++ class_a.bc class_b.bc class_c.bc ... -o class_a.js.

I'm using:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.35.23
clang version 3.9.0  (emscripten 1.35.23 : 1.35.23)

Why it does not work with intermediate bitcode step? Or maybe my approach is incorrect?

Best regards, Paweł




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