[fpc-pascal] alloca

[Marco van de Voort]

On 14-5-2022 17:51, Jonas Maebe via fpc-pascal wrote:
> On 14/05/2022 17:31, Marco van de Voort via fpc-pascal wrote:
>> Also when an exception happens, the stack pointer is not as expected 
>> in exception frames (don't know if that really is an issue, but I can 
>> image).  It would be interesting how C handles this (e.g. exceptions 
>> while alloca called in a loop?)
>
> This is handled via dwarf call frame information, which is also 
> generated by the compiler. It describes how to restore the stack 
> pointer for every instruction address where it changes.
>
I was thinking about SEH, but same principle. But that is exactly what I 
expected, so if you manually mutate the stack pointer using assembler, 
it won't register in the unwind info frames.