[LLVMdev] LHS of an expression

[abhi232 at cc.gatech.edu]

Hi Bill,
Thanks a lot for your response.But my problem still remains.The thing is i
am having a data type std::vector<Value*> as i am checking for the
variables in Store Instructions and Malloc Instructions.For store the case
is straightforward as discussed earlier.I want the same Value* variable
for malloc inst as well.
bcos i cannot have a different set for only instructions.

can there be some way that i can get only the Value* and not the entire
Instruction* ?
Please help.
Thanks.
Hope my doubt is not that silly..
> Hi Abhinav,
>
>> If i have an IR instruction of the form
>> %tmp10 = call sbyte* %malloc( uint 4 )          ; <sbyte*> [#uses=1]
>> %tmp10 = cast sbyte* %tmp10 to int*             ; <int*> [#uses=1]
>> store int* %tmp10, int** %t
>>
>> which is nothin but a malloc call how can i get %tmp into maybe a
>> variable
>> set.
>>
>> If i have a store instruction then it is pretty much simpler as the
>> getOperand(1) can give me the LHS of the expression but in the above
>> case
>> how can we get it.
>>
>> I tried searching for some stuff and got a method called getLHS() method
>> using BinaryOperator and takes Binops as parameter but i dont think that
>> is of much help if i am having a malloc instruction.
>>
>> Can anybody please guide me on this thing please?
>
> The LHS of the instruction is a pointer to the instruction itself
> (except in cases like the store instr, which you've figured out
> already). You can think of the variables that are printed out in the
> .ll file as syntactic sugar to help with debugging. So, if you want
> variables in a set, you can do something like:
>
> MallocInst *M = new MallocInst(...);
>
> std::set<Instruction*> LHSs;
>
> LHSs.insert(M);
>
> -bw
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