On 01/02/18 16:24, Matias Vara wrote:
I partial answered my question by reading https://www.freepascal.org/docs-html/ref/refse114.html. So I think _fpc_local_unwind() is used to call the finally section when "Exit" is executed in the "Try" section. It is not clear yet what the parameters "frame,target: Pointer" are meant to. I checked the code generated in Linux and is a bit different. It is base on the functions FPC_PUSHEXCEPTADDR and FPC_POPADDRSTACK, which It seems much more clear. Is it possible to generate a similar code in the case of Win64? In other words, is it possible to tell the compiler "generate the 'try-finally-end' block as in Linux"? I don't think so but It is worth to ask.
No, it is not possible. On Win64 the compiler and RTL use so-called structured exception handling (SEH), which is required to interoperate with code generated by other compilers. See https://msdn.microsoft.com/en-us/library/windows/desktop/ms680657(v=vs.85).aspx for more information.
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