[LLVMdev] Accessing instruction/operand names

[James Stanier]

Everything that has been said is correct -- I'm using a std::map to index the
pointers to Values, and I think what I'm doing is going to work now although
it'll need a few more hours before I find out for sure!

Thanks ever so much for the help.


Jeffrey Yasskin wrote:
> 
> The other repliers have been right that you probably want to use
> Value*s rather than string names in constructing your dependency
> graph, but I wanted to clear up a second possible point of confusion.
> When you see %2 in the assembly, that's an indication that the
> instruction's name is empty. That is, value->getName() == "". As far
> as I know, llvm-dis just generates numbers in order for un-named
> instructions. When the instruction has a name (value->getName() ==
> "the_name"), you get %the_name instead of the number. Does that make
> sense?
> 
> On Wed, Apr 15, 2009 at 6:20 AM, James Stanier <j.stanier at sussex.ac.uk>
> wrote:
>>
>> Hello everyone,
>>
>> I'm currently constructing a graph from LLVM bitcode, and I have a
>> question
>> about accessing the names of the variables shown in the .ll assembly
>> file,
>> assuming it's possible...
>>
>> For example, with
>>
>> %2 = load i32* %x_addr, align 4         ; <i32> [#uses=1]
>>
>> I can retrieve the opcodeName() from the Instruction object, which is
>> "load". I can also access the operand and use getName() to retrieve
>> "x_addr". However, this instruction is storing into %2 - how do I access
>> the
>> name of that?
>>
>> Also, when an operand is a numbered temporary such as
>>
>> %3 = add i32 %2, %1             ; <i32> [#uses=1]
>>
>> I'm also unable to access the name of it. Are these numberings no longer
>> present in the bitcode? If not, is there any way to find out the name of
>> which local variable it is referencing?
>>
>> Thanks in advance - I've been stuck on this for a while.
>>
>> Best,
>>
>> James
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