On 06.03.2018 11:38, Jan Iversen wrote:
At some point a piece of code (in the same executable) decides to make a uno 
call, this looks like

Cpp2uno_call() ->
                __cxa_throw() ->
                ( C++ throw handling) ->
                        getCaughtException() ->
                                UnoInterfaceProxyDispatch() ->
                                        cpp_call() ->
                                                CallVirtualMethod() ->
                                                        ( Call requested 
function )

Hard to tell what you're actually looking at without seeing a real backtrace (e.g., I have no idea what "Cpp2uno_call()" is supposed to mean).

As there is "getCaughtException()" in your picture: cppu::getCaughtException (cppuhelper/exc_hlp.hxx) internally uses the bridge between C++ and binary UNO to translate the C++ exception being caught by the current catch block into a css::uno::Any. You need that bridge in all its glory, beautiful assembler hackery and all, for that functionality to work.

Because on iOS, no external process will ever call the UNO interface, it is 1 
single executable (I also removed the pipes etc).

Just to be clear: The bridge between C++ and binary UNO is used in more scenarios than just inter-process communication. Other examples are bridging to code in other languages like Java, the thread-affine bridge used by some (Java) database code, or cppu::getCaughtException mentioned above. While the former examples may not be relevant on iOS, the latter one certainly is.
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