[LLVMdev] Accessing Return Variable Names

[Sean Silva]

> Welcome, and this is a frequent newbie question: [...]

If not already there, could you find an appropriate place to put this
in the documentation?

--Sean Silva

On Thu, Jul 5, 2012 at 2:29 PM, Dmitry N. Mikushin <maemarcus at gmail.com> wrote:
> Hi John,
>
> Welcome, and this is a frequent newbie question: in LLVM names are
> more for human readability of the code, they are not really used as
> references internally. Instead engine operates instructions, which
> could be "used by" or "user of" other instructions (see use_iterator
> of Value.h). Also the Function class has an iterator of BasicBlocks,
> and each BasicBlock has an iterator of Instructions. For example, you
> can iterate through all instructions in the scope of your interest and
> find those, whose type is ReturnInst.
>
> Hope it helps,
> - Dima.
>
> 2012/7/5 John Backes <back0145 at umn.edu>:
>> Hello,
>>
>> I'm new to llvm development and I have a question which I think should
>> be straight forward, but I am having trouble figuring it out.  I want to
>> be able to access the return variable name for an instruction.  For some
>> instructions I can get this value through the "getName" method.  For
>> example, with the instruction:
>>
>>  > %arg11 = bitcast i32* %arg1 to i8*, !dbg !42, !id !43
>>
>> calling the "getName" method returns:
>>
>>  > arg11
>>
>> However, for the instruction:
>>
>>  > %4 = load i32* %arg1, align 4, !dbg !57, !id !59
>>
>> the "getName" method returns the empty string.  How would I find the
>> value "4" for this load instruction?  Thanks in advance.
>>
>> - John
>>
>>
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