[fpc-devel] fpc trunk / parentfp for debugger / missing

[Yuriy Sydorov]

On June 21, 2020 00:34:01 Jonas Maebe <jonas at freepascal.org> wrote:

> On 20/06/2020 20:50, Yuriy Sydorov wrote:
>> On 20.06.2020 16:17, Florian Klämpfl wrote:
>>> Am 20.06.20 um 15:04 schrieb Jonas Maebe:
>>>> On 20/06/2020 14:59, Yuriy Sydorov wrote:
>>>>> Maybe implement this in a clean way by adding a new generic
>>>>> optimization
>>>>> cs_opt_hiddenpara?
>>>>
>>>> Maybe cs_opt_unusedpara. It doesn't have to be limited to hidden
>>>> parameters.
>>>
>>> IMO there is even nothing wrong to have a completely separate switch
>>> like cs_opt_unusedparentfp.
>>
>> I've added the generic cs_opt_unused_para optimization option.
>> In future, if needed, more fine-grained related options can be introduced.
>
> It broke compiling packages/ide/src/fpcodcmp.pp with the LLVM backend.
> The issue is when compiling line 234 ("InsertInS(P^.At(I))"). It's
> trying to load the framepointer parameter there from a register that was
> never initialised.
>
> I think that InsertItemsInS' parentfp got optimised away (because that
> procedure does not access parent variables/parameters), but it gets
> loaded anyway due when calling InsertInS because that procedure does
> need it.
>
> It may also be also broken with FPC's code generator, but simply not get
> detected at compile time

I'll take a look at this tomorrow.
Thanks for reporting.

Yuriy.