> Throwing with `throw` instead of `@throw` should do that: the exception will
> be thrown by the C++ runtime, not the Objective-C one. I thought your
> problem was the other way around though, so it might be that you need a c++
> destructor to force the ObjC runtime to turn it into a C++ exception for
> delivery to C++.
I tweaked my code a bit. I now have an ObjC class in a .m file that throws an
exception like this:
- (void)poke
{
[NSException raise:@"Exception" format:@"Exception"];
}
I call this from a .m file, inside an NS_HANDLER, and then re-raise the
exception. The goal here is to pass the NSException through a plain ObjC frame:
- (void)poke
{
NS_DURING
[_oc poke];
NS_HANDLER
NSLog(@"Caught second exception");
[localException raise];
NS_ENDHANDLER
}
Finally, I call this from a .mm file, inside a C++ class method:
void tryCpp() {
Tester *t = [[Tester new] autorelease];
try {
try {
NSLog(@"tryCpp starting");
[t poke];
} catch(NSException *e) {
NSLog(@"tryCpp aught ObjC exception");
throw e;
}
} catch(...) {
NSLog(@"tryCpp caught outer exception");
}
}
The goal here is to do what you suggested above, namely, force the ObjC runtime
to turn the NSException into a C++ exception for delivery to the tryCpp method,
which is a plain C++ instance method. But the debug output (copied below)
suggests that is not happening: all of the exception personalities are of class
GNUCOBJC. Am I missing a step here, or not understanding the way exception
personalities are passed through frames? I'm still learning this, so maybe I'm
missing something obvious.
Thanks,
--David
Debug output:
2017-12-12 15:28:01.629 RunTest[19196:19196] tryCpp starting
Throwing 0x17cf610
New personality function called 0x17db3a0
Class: GNUCOBJC
LSDA: 0x40405c
Search phase...
Filter: 1
Class name: NSException
0x7f3316d04de8 type: 1
found handler for NSException
handler: 4
Found handler! 4
New personality function called 0x17db3a0
Class: GNUCOBJC
LSDA: 0x40405c
Phase 2: Fight!
Installing context, selector 1
Beginning catch 0x17db3a0
objc catch
2017-12-12 15:28:01.629 RunTest[19196:19196] Caught second exception
Throwing 0x17cf610
New personality function called 0x17db440
Class: GNUCOBJC
LSDA: 0x40405c
Search phase...
handler: 1
New personality function called 0x17db440
Class: GNUCOBJC
LSDA: 0x40405c
Phase 2: Fight!
Not the handler frame, looking up the cleanup again
handler! 1 0
Installing cleanup...
Installing context, selector 0
Ending catch
New personality function called 0x17db440
Class: GNUCOBJC
LSDA: 0x40405c
Phase 2: Fight!
Not the handler frame, looking up the cleanup again
2017-12-12 15:28:01.629 RunTest[19196:19196] tryCpp aught ObjC exception
Throwing 0x17cf610
2017-12-12 15:28:01.629 RunTest[19196:19196] tryCpp caught outer exception
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