Uncaught unwind exception

[aharondavid]

What can be the cause of 'Uncaught unwind' exception below , there are no debugger call stack and I don't have any clue what is rasing that error :

[sbc100]

The unwind exception is used to unwind the stack if you call emscripten_set_main_loop or emscripten_unwind_to_js_event_loop or emscripten_exit_with_live_runtime and also if you call exit.

This location in the invoke_iiii function is just re-throwing that excption. If you set a breakpoint there perhaps you can see the original call stack?

Can you share all the settings that you are using? The best way to do this is if you can share your full linker command line.

[aharondavid]

eventually, the SAFE_HEAP=1 does the work.
the crash is because exception on unaligned pointer access.
I am wandering if the 'unaligned pointer access' is just because setting of SAFE_HEAP

[sbc100]

Looks like you want SAFE_HEAP=2:

emscripten/src/settings.js

Lines 305 to 314 in 4cf36b6

	// Check each write to the heap, for example, this will give a clear
	// error on what would be segfaults in a native build (like dereferencing
	// 0). See runtime_safe_heap.js for the actual checks performed.
	// Set to value 1 to test for safe behavior for both Wasm+Wasm2JS builds.
	// Set to value 2 to test for safe behavior for only Wasm builds. (notably,
	// Wasm-only builds allow unaligned memory accesses. Note, however, that
	// on some architectures unaligned accesses can be very slow, so it is still
	// a good idea to verify your code with the more strict mode 1)
	// [link]
	var SAFE_HEAP = 0;

[aharondavid]

Thank!
I wouldn't get over on it without that help.