[LLVMdev] type of the store operand

[Zheng Wang]

Hi John,

Thanks. In this case, if I call getType(), it will return a pointer
type. So, how do I know whether this is an pointer points to an
integer address?

On 14 May 2010 15:33, John Criswell <criswell at uiuc.edu> wrote:
> Zheng Wang wrote:
>>
>> Hiya,
>>
>> I want to know what's the type of the operand (value) along with the
>> store instruction. For example, the following instruction store the
>> content in an integer type pointer scevgep99.1 to the address another
>> integer pointer points to.
>>
>> *"store i8* %scevgep99.1, i8** %scevgep92.1, align 4"*
>>
>> It seems there is no APIs in StoreInst can do this.
>>
>> Is there any way to figure the type of the operand of the store
>> instruction?
>>
>
> You can do this by first using getOperand() to get the operand of the store
> instruction which interests you and then calling getType() on the resulting
> Value * to get the type of the value being stored.
>
> It'll look something like this if SI is a pointer to a StoreInst object and
> i is the index of the operand being stored to memory:
>
> SI->getOperand(i)->getType();
>
> -- John T.
>
>>
>> -----------------------------------
>>
>>  %scevgep92.1 = bitcast i8* %scevgep.1 to i8**   ; <i8**> [#uses=1]
>>  %tmp96.1 = mul i32 %36, %41                     ; <i32> [#uses=1]
>>  %tmp97.1 = add i32 %tmp96.1, 32                 ; <i32> [#uses=1]
>>  %tmp98.1 = add i32 %tmp97.1, %61                ; <i32> [#uses=1]
>>  %scevgep99.1 = getelementptr i8* %56, i32 %tmp98.1 ; <i8*> [#uses=1]
>>  store i8* %scevgep99.1, i8** %scevgep92.1, align 4
>>  %scevgep.2 = getelementptr i8* %0, i32 112      ; <i8*> [#uses=1]
>>  %scevgep92.2 = bitcast i8* %scevgep.2 to i8**   ; <i8**> [#uses=1]
>>
>> Cheers,
>> Zheng
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>>
>
>



-- 
Best regards,

WANG Zheng