[LLVMdev] How to extract Left Hand side of Instruction

[Dan Gohman]

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