llvm dev - Apr 2010 - [LLVMdev] How to extract Left Hand side of Instruction

Hi,

Suppose I have llvm Instruction as :

  %9 = load i32* %b, align 4

and I want to extract the name of temporary value used here ie 9.
Can any body tell that how can I do that?

thanks and regards,
Ambika

On Thu, Apr 15, 2010 at 12:46 PM, ambika <ambika at cse.iitb.ac.in>
wrote:
> Hi,
>
> Suppose I have llvm Instruction as :
>
>  %9 = load i32* %b, align 4
>
> and I want to extract the name of temporary value used here ie 9.
> Can any body tell that how can I do that?
Values can be unnamed, they are numbered for convenience.  If they do
have a name, you can call getName() or getNameStr() to find out the
name.

Andrew
> thanks and regards,
> Ambika
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

ambika wrote:
> Hi,
>
> Suppose I have llvm Instruction as :
>
>   %9 = load i32* %b, align 4
>
> and I want to extract the name of temporary value used here ie 9.
> Can any body tell that how can I do that?
>   
I believe it's the getNameStr() method.

Note that not all instructions have names (i.e., getNameStr() might give 
you an empty string).  I think the LLVM disassembler prints a number 
when the instruction has no name.

There's a pass which, I think, gives names to all values, but I don't 
recall the pass's name.

-- John T.
> thanks and regards,
> Ambika
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

On Apr 15, 2010, at 12:00 PM, John Criswell wrote:
> ambika wrote:
>> Hi,
>> 
>> Suppose I have llvm Instruction as :
>> 
>>  %9 = load i32* %b, align 4
>> 
>> and I want to extract the name of temporary value used here ie 9.
>> Can any body tell that how can I do that?
>> 
> 
> I believe it's the getNameStr() method.
> 
> Note that not all instructions have names (i.e., getNameStr() might give 
> you an empty string).  I think the LLVM disassembler prints a number 
> when the instruction has no name.
> 
> There's a pass which, I think, gives names to all values, but I
don't
> recall the pass's name.
There is, though it's purely for cosmetic purposes, so it shouldn't be
a dependency.  In the C++ API, values are identified by Value*,
rather than by name. The Value* for a load is the LoadInst* itself.
Because this is SSA, there are no other definitions of that value.

Dan