On Windows the function that calls the language specific exception handler function registers it's own exception handler, so the top of the exception chain does not point to our own handler. We need to take that into account when unwinding the stack and removing each handler as we go.
Previously, when leave was used in the except or finally block of a nested try block, it would jump back to the start of the except/finally block, resulting in an endless loop. This is fixed by jumping back to a label at the beginning of the try block, which is only visible from within the try block itself and from there to the end of the SEH block.
Fixes seh0055 testcase of MS SEH tests.
Hackfixing a corner case detected via broken entities of wlanwiz
due to its usage of STLport. This was already done to PSEH3 prior to me.
Corner case examples:
- broken: 1591123914
- "fixed": 1594570563
Guard SEH2 family macros behind #ifndef. CORE-6622 CORE-6905
This is used with Clang, which does have native SEH, but it's broken and can cause the compiler to crash. Previously some code was not handling this and instead used native SEH for clang. Fix this by always using _SEH2_* macros instead of relying on __USE_PSEH2__ to be defined.
Try to improve things
The change is needed, because the previous version emitted multiple ".seh_handlerdata" blocks and GAS isn't able to merge them into one, but will instead only include the first one. This is fixed by generating "asm defines" in the code and pass the line number to the "REACTOS seh" pragma, which is then used to create all handler data by referring to the predefined symbols, that include the line number.
Also the EstablisherFrame parameter passed to the filter/finally function is the original stack pointer, not the frame pointer! Take this into account by passing __builtin_frame_address(0) from the filter context to the global wrapper function, which includes the frame-offset, and use that to recalculate the frame-pointer from the passed in stack pointer.
Also, put include directory next to the library and use
target_include_directories(.. INTERFACE ..) to get this right.
This is because :
- Having includes & implementation in two different places buggers me
- This makes sure that there is no "if it compiles everything is fine" behaviour from anyone
because now even static libraries need it for GCC amd64 build
Also add __USE_PSEH2__ define for the non SEH-aware compilers out there and use it in a few headers
where we define macros involving __try
