[llvm-dev] Status of debuginfo-tests

Adrian Prantl via llvm-dev llvm-dev at lists.llvm.org
Thu Sep 7 12:11:43 PDT 2017

> On Sep 7, 2017, at 12:01 PM, Zachary Turner <zturner at google.com> wrote:
> On Thu, Sep 7, 2017 at 11:49 AM Adrian Prantl <aprantl at apple.com <mailto:aprantl at apple.com>> wrote:
>> On Sep 7, 2017, at 11:37 AM, Zachary Turner via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> To be clear, the tests I'm proposing will have no resemblance whatsoever to GDB, so I would be intentionally forking the set of tests in this regards.  So there would very clearly be a paradigm shift in writing CodeView debug info tests (which would be written in JavaScript using WinDbg specific debugger commands) and DWARF debug info tests (which would be written in whatever / using GDB style commands)
> That sounds like an unfortunate direction. Can you explain why it wouldn't be possible to write a wrapper (in JavaScript) that interprets the 3ish gdb commands used by the tests in terms of WinDbg? Similar to how LLDB is supported?
> I can think of a couple of reasons:
> 1) We're already going to need entirely different runlines.  clang and clang-cl don't use the same command line options, or for that matter even styles.

I'm not familiar with clang-cl so please bear with me if this is a stupid question: Is clang-cl just an MSVC compatible driver? Can you not produce the same result by using the "standard" clang driver and a windows target triple?

> 2) The output format is going to be different.  whereas the current tests look for things like 

If you are going to write a wrapper script for the debugger commands, that wrapper script could also transform the output to look more like the GDB output that the CHECK-lines are looking for.
> // CHECK: ${{[0-9]+}} =
> // CHECK:  Data ={{.*}} 0x0{{(0*)}}
> // CHECK:  Kind = 2142
> In WinDbg this is going to be more like:
> Local var @ 0x6ffa50 Type SVal
>    +0x000 Data             : (null) 
>    +0x004 Kind             : 0x85e
> So we're also going to need different check lines.
> At this point, the only similarities in the PDB / DWARF tests is going to be the source code, as I don't see an easy way to automatically translate command lines, input commands, and output text.
By the way, I'm fine with adding, e.g., a PDB subdirectory with a lit filter that contains tests that will only work under Windows, but it would be very unfortunate if there was no common set of tests, since then the Windows folks wouldn't benefit from new tests being added for GDB and vice versa.

-- adrian
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