[Lazarus] CFI in FpDebug

[Pascal Riekenberg]

Hi Joost,

i think i have a problem with this. When starting to debug with FpDebug on Windows 10 64bit i get the following error:
TApplication.HandleException: EListError
Duplicate ID: 0000000000000000
  Stack trace:
  $00000001001EA1CF  Error,  line 383 of maps.pp
  $00000001001E9DF8  InternalAdd,  line 406 of maps.pp
  $00000001001EB362  Add,  line 763 of maps.pp
  $0000000100D686E6  AddFDE,  line 508 of fpdbgdwarfcfi.pas
  $0000000100D36112  LoadCallFrameInstructions,  line 4022 of fpdbgdwarfdataclasses.pas
  $0000000100D0CDA0  LoadInfo,  line 1754 of fpdbgclasses.pp
  $0000000100D0F172  LoadInfo,  line 2392 of fpdbgclasses.pp
  $0000000100D70706  SendEvents,  line 1808 of fpdbgcontroller.pas
  $0000000100FB66C8  DebugLoopFinished,  line 3850 of fpdebugdebugger.pas
  $0000000100FA6B81  LoopFinished_DecRef,  line 677 of fpdebugdebugger.pas
  $000000010005FD3E  ProcessAsyncCallQueue,  line 1082 of include/application.inc
  $000000010005DD52  Idle,  line 441 of include/application.inc
  $0000000100060759  HandleMessage,  line 1281 of include/application.inc
  $0000000100060E77  RunLoop,  line 1417 of include/application.inc
  $00000001000CCAD5  AppRun,  line 54 of include/interfacebase.inc
  $0000000100060E27  Run,  line 1405 of include/application.inc
  $0000000100003784  $main,  line 154 of lazarus.pp

Pascal

> Joost van der Sluis via lazarus <lazarus at lists.lazarus-ide.org> hat am 28.06.2022 23:21 CEST geschrieben:
> 
>  
> Hi all,
> 
> I've just pushed a commit that changed the stack-unwinding logic for 
> FpDebug.
> 
> What is new is that when the executable includes Call Frame Information 
> (CFI) as specified by the Dwarf-format and CFI is available for the a 
> certain location, the CFI is used to unwind the stack. (x86_64 and i386 
> only)
> 
> Note however, that the CFI generated by FPC is not always correct, but 
> in those cases is should fallback to the old implementation.
> 
> In principle things could only get better. But if not, please tell me.
> 
> Regards,
> 
> Joost.
> -- 
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