Why does the number become negative in JS and what would be required for
this to work?
I did compile with -sWASM_BIGINT.
On Wednesday, 20 October 2021 at 11:49:36 UTC+2 Márton Marczell wrote:
> Hi,
>
> Given this example code:
>
> #include <iostream>
> #include <emscripten.h>
>
> #define MYINT64 uint64_t
>
> extern "C" void EMSCRIPTEN_KEEPALIVE bar (MYINT64 n) {
> std::cout << "C++ called from JS: " << n << std::endl;
> }
>
> EM_JS(void, foo, (MYINT64 i), {
> console.log("JS", i, typeof(i));
>
> Module.ccall('bar', null, ['number'], [i]);
> });
>
> int main() {
> auto some = std::numeric_limits<MYINT64>::max();
> std::cout << "C++ " << some << std::endl;
> foo(some);
> }
>
> The code prints:
>
> C++ 18446744073709551615
> JS -1n bigint
> C++ called from JS: 18446744073709551615
>
>
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