[llvm-dev] GDB pretty printers for LLVM ADTs

[Pete Cooper via llvm-dev]

> On Dec 20, 2016, at 9:55 AM, David Blaikie via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Dandy :)
> 
> I looked into ways to do this for the GDB visualizers - but was unable to come up with a totally automated solution, unfortunately.
I've wanted the same.  Best I could think of was to embed them (or a reference to them) in the binary for the debugger to look at.  No idea if it would be accepted though.  Just a thought.

Also thanks for adding the docs.  Would you (or would you mind if I) add a similar one for the lldb pretty printers?

Cheers,
Pete
> 
> On Tue, Dec 20, 2016 at 9:51 AM Yaron Keren <yaron.keren at gmail.com <mailto:yaron.keren at gmail.com>> wrote:
> The VC visualizers are automatcially installed.
> 
> 
> 2016-12-20 19:45 GMT+02:00 David Blaikie via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>:
> Added something in r290186.
> 
> Say, Reid - do you know anything about the MSVC formatters that are also provided in LLVM? Perhaps you could add a brief bit of documentation about them, if they need an explicit wiring up (if they just come for free/automatically - might not be worth documenting, people will find it when they need it) or point this thread to someone who knows about them to provide such documentation.
> 
> - Dave
> 
> 
> On Tue, Dec 20, 2016 at 2:43 AM Piotr Padlewski <piotr.padlewski at gmail.com <mailto:piotr.padlewski at gmail.com>> wrote:
> I guess adding section "Debugging" at the bottom of programmers manual would sounds like a good plan to me.
> 
> Piotr
> 
> 2016-12-20 6:03 GMT+01:00 David Blaikie <dblaikie at gmail.com <mailto:dblaikie at gmail.com>>:
> Good point - any ideas on where in the programmer's manual would suit best? Looking around I sort of feel like it belongs in the "Picking the right data structure" section - but I fear someone merely examining existing data structures might not think to look there for help in their task (if they have no need to 'pick' a data structure for a new use, etc).
> 
> On Mon, Dec 19, 2016 at 2:47 AM Piotr Padlewski <piotr.padlewski at gmail.com <mailto:piotr.padlewski at gmail.com>> wrote:
> Excellent. I think it would make sense to add small section somewhere in documentation (e.g. LLVM Programmer’s Manual <http://llvm.org/docs/ProgrammersManual.html>) about it, so it won't be lost somewhere in the mailing list.
> 
> Piotr
> 
> 2016-12-17 1:04 GMT+01:00 David Blaikie via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>:
> Added some basic DenseMap support in r290011
> 
> On Fri, Dec 16, 2016 at 2:05 PM David Blaikie <dblaikie at gmail.com <mailto:dblaikie at gmail.com>> wrote:
> I've added a few LLVM GDB pretty printers a while back (& just added llvm::Optional earlier today) & thought people might be interested in how to use them, etc.
> 
> I use them by adding the following to my .gdbinit:
> 
>   source /path/to/llvm/src/utils/gdb-scripts/prettyprinters.py
> 
> Also, I can suggest adding:
> 
>   set print pretty on
> 
> there too, it helps a lot when printing complex nested data structures.
> 
> Once you have that, you can get pretty output like this:
> 
> (gdb) p Abbrev->AbbrDeclSets
> $1 = std::map with 1 elements = {
>   [0] = {
>     Offset = 0,
>     FirstAbbrCode = 1,
>     Decls = std::vector of length 1, capacity 1 = {{
>         Code = 1,
>         Tag = llvm::dwarf::Tag::DW_TAG_compile_unit,
>         CodeByteSize = 1 '\001',
>         HasChildren = false,
>         AttributeSpecs = llvm::SmallVector of length 8, capacity 8 = {{
>             Attr = llvm::dwarf::Attribute::DW_AT_low_pc,
>             Form = llvm::dwarf::Form::DW_FORM_addr,
>             ByteSize = llvm::Optional is not initialized
>           }, {
>             Attr = llvm::dwarf::Attribute::DW_AT_high_pc,
>             Form = llvm::dwarf::Form::DW_FORM_data8,
>             ByteSize = llvm::Optional is initialized = {
>               value = 8 '\b'
>             }
> 
> Here you can see the pretty printers for SmallVector and Optional, but there's also support for StringRef, SmallString, and ArrayRef.
> 
> I've tried doing a DenseMap pretty printer, but haven't quite figured it out yet (having trouble calling member functions to do some of teh more complicated parts of DenseMap iteration - may end up printing it with the tombstone/empty values present, but not sure how easy that'll be to read, etc). Happy to take requests or talk people through adding more pretty printers anyone wants to add :)
> 
> Enjoy!
> - Dave
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev <http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
> 
> 
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev <http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20161220/c0904df7/attachment.html>