What is the rule about apparency of invoke_xxx calling function from Emscripten.js function to WASM function

[aharondavid]

When I look into the chrome debug call stuck I see the Emscripten.js invoke_xxx function in the middle of two c++ functions.
It is not clear when Emscripten.js use that invoke_xxx function and who can I force pure c++ without go out to JS.

[sbc100]

The invoke_xxx are used to implement C++ exception handling and setjmp/longjmp because Wasm historically doesn't have any control flow structure like try/catch.

If you want to avoid those you can build without exceptions and setjmp/longjmp support (-sSUPPORT_LONGJMP=0). Or you can try building with the new wasm exception handling support -fwasm-exceptions.