llvm dev - Mar 2011 - [LLVMdev] Question about TableGen when adding LLVM Backend.

Hello Jakob,

Is this means that TableGen execution is handled in Makefile. Porting
programmer doesn't need to execute TableGen by hand?

thanks

2011/3/10 Jakob Stoklund Olesen <stoklund at 2pi.dk>
>
> On Mar 9, 2011, at 2:13 PM, Lu Mitnick wrote:
>
> > Hello all,
> >
> > I have some question about usage of TableGen when adding a new LLVM
> Backend. There are three place to use TableGen in basic steps of document
> "Writing an LLVM Compiler
> > Backend":
> >
> > 2. Describe the register set of the target. Use "TableGen"
to generate
> code for register definition, register aliases, and register classes from a
> target-specific RegisterInfo.td input file.
> >
> > 3. Describe the instruction set of the target. Use
"TableGen" to generate
> code for target-specific instructions from target-specific versions of
> TargetInstrFormats.td andTargetInstrInfo.td.
> >
> > 4. Describe the selection and conversion of the LLVM IR from a
Directed
> Acyclic Graph (DAG) representation of instructions to native
target-specific
> instructions. Use "TableGen" to generate code that matches
patterns and
> selects instructions based on additional information in a target-specific
> version of TargetInstrInfo.td.
> >
> > I have already read the document "TableGen Fundamentals" and
write
> correspond .td files in each steps. However I don't know which TableGen
> options should I use in 2, 3 or 4 steps as above. Would anyone mind to tell
> me??
>
> Look at Makefile.rules in the LLVM top-level directory. There is a bunch of
> targets executing $(TableGen).
>
> You can also run 'make VERBOSE=1' to see the commands used to build
the
> existing targets.
>
> /jakob
>
>
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On Mar 9, 2011, at 8:15 PM, Lu Mitnick wrote:
> Hello Jakob,
> 
> Is this means that TableGen execution is handled in Makefile. Porting
programmer doesn't need to execute TableGen by hand?
That's right.

You are going to be editing your .td files a lot, so you want that integrated in
the build system.

Am 10.03.2011 um 05:35 schrieb Jakob Stoklund Olesen:
> On Mar 9, 2011, at 8:15 PM, Lu Mitnick wrote:
>
>> Hello Jakob,
>>
>> Is this means that TableGen execution is handled in Makefile.  
>> Porting programmer doesn't need to execute TableGen by hand?
>
> That's right.
>
> You are going to be editing your .td files a lot, so you want that  
> integrated in the build system.
In practice that'll mean adding the correct directives to  
CMakeLists.txt, not Makefile, right? That's what the targets I looked  
at did.
Or is that optional when you just invoke "make"?

Andreas