Is there, by chance, any documentation on how
-fexceptions/-fwasm-exceptions are actually implemented? What I'd like
to understand is why, apparently, a JS exception thrown across C++
frames causes automatic vars in those frames to get destroyed with
-fwasm-exceptions but not with -fexceptions:
$ cat test.cc
#include <iostream>
#include <emscripten.h>
#include <emscripten/bind.h>
struct S { ~S() { std::cout << "destructor\n"; } };
EM_JS(void, js4, (), { throw Error(); });
void cpp3() { js4(); };
void cpp2() {
S s;
cpp3();
}
EM_JS(void, js1, (), {
try {
Module.cpp2();
} catch (e) {
console.log("catch");
}
});
EMSCRIPTEN_BINDINGS(test) { emscripten::function("cpp2", &cpp2); }
int main() { js1(); }
$ em++ -fwasm-exceptions -lembind test.cc
$ node a.out.js
destructor
catch
$ em++ -fexceptions -lembind test.cc
$ node a.out.js
catch
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