search for: d85012

Hi Djordje, [Late reply as I was away, alas], For the example in https://reviews.llvm.org/D85012 , I'm not sure that just using an entry value is correct. The reason why the dbg.values for arguments are set to undef is not because the value can't be described, it's because deadargelim changes all the call sites to pass in 'undef', which I believe makes the value unrecoverab...

...= param + 2;). Proposal The idea of this RFC is to introduce an idea/discussion of using the DW_OP_entry_value not only at the end of LLVM pipeline (within LiveDebugValues). There are cases it could be useful at IR level; i.e. for unused arguments (please take a look into https://reviews.llvm.org/D85012); I believe there are a lot of cases where an IR pass drops/cuts variable’s debug value info where an entry value can fall back on as a backup location. There could be multiple ways of implementation, but in general, we need to extend metadata describing the debug value to support/refer to entry va...

...ues). There are cases it could be useful at IR level; i.e. for > unused arguments (please take a look into > https://protect2.fireeye.com/v1/url?k=16c671b9-4876ec21-16c63122-861fcb972bfc-e4488a7f57de3412&q=1&e=4f293e8b-6a1f-4a80-9de1-30399c7295a6&u=https%3A%2F%2Freviews.llvm.org%2FD85012 > ); I believe there are a lot of cases where an IR pass drops/cuts variable’s > debug value info where an entry value can fall back on as a backup location. > There could be multiple ways of implementation, but in general, we need to > extend metadata describing the debug value to supp...