[LLVMdev] question

[George Baah]

Well, the code says compile unit takes an MDNode but It doesn't say the
MDNode has to come from a specific node. Maybe the documentation should be
updated to make this clear for those of us who are still learning the ins
and outs of llvm.

George

On Fri, Oct 5, 2012 at 12:05 PM, Robinson, Paul
<Paul.Robinson at am.sony.com>wrote:

>  You should probably think of the DIFooBar constructors like
> reinterpret-casts, not
>
> "go find the thing I actually want" functions.  If you hand
> DICompileUnit() a node
>
> that is not a compile-unit metadata node, it's not going to tell you that
> you goofed.
>
>
>
> If you _did_ have a CU metadata node, then DICompileUnit's getDirectory()
> would
>
> work just fine. But you don't.
>
> --paulr
>
>
>  ------------------------------
> *From:* llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] on
> behalf of George Baah [georgebaah at gmail.com]
> *Sent:* Thursday, October 04, 2012 7:19 PM
> *To:* Eric Christopher
> *Cc:* LLVM Developers Mailing List
> *Subject:* Re: [LLVMdev] question
>
>  Hmmm, but it has a getDirectory function.
>
>  -G
>
> On Thu, Oct 4, 2012 at 3:50 PM, Eric Christopher <echristo at gmail.com>wrote:
>
>> That's because instructions have a location associated with them, not
>> a compile unit.
>>
>> -eric
>>
>> On Thu, Oct 4, 2012 at 12:46 PM, George Baah <georgebaah at gmail.com>
>> wrote:
>> > I used DILocation instead of DICompileUnit and it works. Hmmm,
>> interesting.
>> >
>> > George
>> >
>> > On Thu, Oct 4, 2012 at 1:33 AM, George Baah <georgebaah at gmail.com>
>> wrote:
>> >>
>> >> Here is the code. I am running on llvm 3.1 on Lion (Mac 10.7.4)
>> >>
>> >> string getFileDirectory(const Instruction &I){
>> >>
>> >>   MDNode *MD = I.getMetadata("dbg");
>> >>
>> >>   DICompileUnit compileUnit(MD);
>> >>
>> >>   return compileUnit.getDirectory().str();
>> >>
>> >> }
>> >>
>> >>
>> >> George
>> >>
>> >> On Wed, Oct 3, 2012 at 12:40 PM, Eric Christopher <echristo at gmail.com>
>> >> wrote:
>> >>>
>> >>> Without knowing the code that you've written and the IR that you're
>> >>> running on I'm
>> >>> not sure what I can do to help you.
>> >>>
>> >>> -eric
>> >>>
>> >>> On Wed, Oct 3, 2012 at 9:32 AM, George Baah <georgebaah at gmail.com>
>> wrote:
>> >>> > Yeah, It looks like I am doing exactly what's in Dwarf*.cpp files,
>> yet
>> >>> > I am
>> >>> > getting blanks.
>> >>> >
>> >>> > George
>> >>> >
>> >>> > On Tue, Oct 2, 2012 at 2:10 PM, Eric Christopher <
>> echristo at gmail.com>
>> >>> > wrote:
>> >>> >>
>> >>> >> On Tue, Oct 2, 2012 at 11:00 AM, George Baah <georgebaah at gmail.com
>> >
>> >>> >> wrote:
>> >>> >> > Hi Guys,
>> >>> >> >   How does one get the directory of the compilation unit in llvm?
>> >>> >> > I am using DICompileUnit but for some reason I am getting blanks
>> >>> >> > for the directory name. Here is my code ...
>> >>> >> >
>> >>> >> > MDNode *MD = I.getMetadata("dbg");
>> >>> >> >
>> >>> >> > DICompileUnit compileUnit(MD);
>> >>> >> >
>> >>> >> > return compileUnit.getDirectory().str();
>> >>> >> >
>> >>> >>
>> >>> >> In general for these questions it's easier to look at how it's
>> done in
>> >>> >> DwarfDebug.cpp and DwarfCompileUnit.cpp.
>> >>> >>
>> >>> >> -eric
>> >>> >
>> >>> >
>> >>
>> >>
>> >
>>
>
>
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