[llvm-dev] FileCheck

[Chris Lattner via llvm-dev]

> On Jun 18, 2020, at 11:36 AM, Matt Arsenault <arsenm2 at gmail.com> wrote:
> 
> 
> 
>> On Jun 18, 2020, at 14:32, Chris Lattner via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> 
>> 2) Instead of dumping the entire input by default, would it be reasonable to change the default “make check” to have  FileCheck print the 10 lines before and after the mismatch?  Most problems are close by the check failure.  If you want to check extra fancy, dump the CHECK-LABEL region.
>> 
> 
> In my experience, the entire CHECK-LABEL region is still way too much (e.g. MIR tests print a giant block of function information in the prolog). There needs to be a stricter line count clamping of some kind

Sure, what I’m actually advocating here is a pile of heuristics that work well for humans: e.g. dump the label region if it is 20 lines or less.  If it is large, then look at where the last match and the fuzzy next match are, and include that, .. etc.  FileCheck has a lot of information that we’re not using and some elbow grease could make the default experience way nicer for humans.

-Chris

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