From 5ed8df22cd59680a685c4ada7daa5555bf59d4fe Mon Sep 17 00:00:00 2001 From: Nat Goodspeed Date: Tue, 28 May 2024 13:22:05 -0400 Subject: Fix up llexception.h's cross-platform SEH wrapper. Introduce AlwaysReturn specialization, which always discards any result of calling the specified callable with specified args. Derive new Windows_SEH_exception from LLException, not std::runtime_error. Put the various SEH functions in LL::seh nested namespace, e.g. LL::seh::catcher() as the primary API. Break out more levels of Windows SEH handler to work around the restrictions on functions containing __try/__except. The triadic catcher() overload now does little save declare a std::string stacktrace before forwarding the call to catcher_inner(), passing a reference to stacktrace along with the trycode, filter and handler functions. catcher_inner() accepts the stacktrace and the three function template arguments. It contains the __try/__except logic. It calls a new filter_() wrapper template, which calls fill_stacktrace() before forwarding the call to the caller's filter function. fill_stacktrace(), in the .cpp file, contains the logic to populate the stacktrace string -- unless the Structured Exception is stack overflow, in which case it puts an explanatory string instead. catcher_inner()'s __except clause passes not only the code, but also the stacktrace string, to the caller's handler function. It wraps the caller's handler function in always_return(), where rtype is the type returned by the trycode function. This allows a handler to return a value, while also supporting the void handler case, e.g. one that throws a C++ exception. (This is why we need AlwaysReturn: some trycode() functions are themselves void.) For the dyadic catcher() overload, introduce common_filter() containing the logic to distinguish a C++ exception from any other kind of Structured Exception. The fact that the stacktrace is captured before the filter function is called should permit capturing a stacktrace for a C++ exception as well as for most other Structured Exceptions. As before, the monadic catcher() overload supplies the rethrow() handler, in the .cpp file. Change existing calls from seh_catcher() to LL::seh::catcher(). --- indra/llwindow/llwindowwin32.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'indra/llwindow/llwindowwin32.cpp') diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp index 1535d00d50..12cd5320b8 100644 --- a/indra/llwindow/llwindowwin32.cpp +++ b/indra/llwindow/llwindowwin32.cpp @@ -163,7 +163,7 @@ HGLRC SafeCreateContext(HDC &hdc) GLuint SafeChoosePixelFormat(HDC &hdc, const PIXELFORMATDESCRIPTOR *ppfd) { - return seh_catcher(ChoosePixelFormat(hdc, ppfd)); + return LL::seh::catcher([hdc, ppfd]{ return ChoosePixelFormat(hdc, ppfd); }); } //static -- cgit v1.2.3