llvm dev - Sep 2012 - [LLVMdev] How To Get The Name of the type the popinter is pointing to

I want to know the type of pointer .
for example 


if we have 

int *p,
struct node *w

char *q

then i want int for p,char for q , struct node for w.

any help would be appreciated.




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amitjai <amitjaiswal.knit at gmail.com> writes:
> I want to know the type of pointer .
> for example 
>
>
> if we have 
>
> int *p,
> struct node *w
>
> char *q
>
> then i want int for p,char for q , struct node for w.
Is your question related to Clang? If yes, you'll better ask on Clang's
mailing list ( cfe-dev, see http://clang.llvm.org/ )

If your question is about LLVM, let's suppose `v' is a pointer to a
llvm::Value instance or one of its derivatives, then

llvm::outs() << *v << '\n';

will print on the console a reprentation of the Value, including its
Type, while

llvm::outs() << *v->getType() << '\n';

will print a representation of its Type.

HTH.

[resending message. somehow the address of llvmdev was corrupted when it
reached some intermediate server]

amitjai <amitjaiswal.knit at gmail.com> writes:
> I want to know the type of pointer .
> for example 
>
>
> if we have 
>
> int *p,
> struct node *w
>
> char *q
>
> then i want int for p,char for q , struct node for w.
Is your question related to Clang? If yes, you'll better ask on Clang's
mailing list ( cfe-dev, see http://clang.llvm.org/ )

If your question is about LLVM, let's suppose `v' is a pointer to a
llvm::Value instance or one of its derivatives, then

llvm::outs() << *v << '\n';

will print on the console a reprentation of the Value, including its
Type, while

llvm::outs() << *v->getType() << '\n';

will print a representation of its Type.

HTH.

i am using llvm ,
i did this 

                        if (  AllocaInst *allocInst
dyn_cast<AllocaInst>(&*bbit)){
                                PointerType *p = allocInst->getType();
                                if ( p->getElementType()->isPointerTy()){
                                        StringRef name allocInst->getName();
                                        Type *type
allocInst->getOperand(0)->getType();;
                                        errs() << type->getName()
<< "   "
<< name << "\n";
                                }
                        }

but i am getting the output in the following format

i32   line
i32   temp
i32   p
i32   filename
i32   arrays
i32   label
i32   fp
i32   head
i32   b

here line is char* ,temp is char* , p is int pointer,fp is file pointer
,head is pointer to list node structure and so on

but why i am getting i32 for all the pointers .

please help me out.



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amitjai wrote
> i am using llvm ,
> i did this 
> 
>                         if (  AllocaInst *allocInst = dyn_cast
> <AllocaInst>
> (&*bbit)){
>                                 PointerType *p = allocInst->getType();
>                                 if (
p->getElementType()->isPointerTy()){
>                                         StringRef name >
allocInst->getName();
>                                         Type *type >
allocInst->getOperand(0)->getType();;
>                                         errs() << type->getName()
<< "   "
> << name << "\n";
>                                 }
>                         }
> 
> but i am getting the output in the following format
> 
> i32   line
> i32   temp
> i32   p
> i32   filename
> i32   arrays
> i32   label
> i32   fp
> i32   head
> i32   b
> 
> here line is char* ,temp is char* , p is int pointer,fp is file pointer
> ,head is pointer to list node structure and so on
> 
> but why i am getting i32 for all the pointers .
> 
> please help me out.
Hi ,
I am using the following code to get the Type of Pointer  element allocated-

if ( (AllocaInst *AI  = dyn_cast<AllocaInst> (Inst)) ) 
    if ( AI->getType()->getElementType()->isPointerTy() ) 
      errs() <<  "\nType :- " << 
*AI->getType()->getElementType()
                                     <<  "\tName:- " <<
AI->getName();


"allocInst->getOperand(0)" contains the number of elements of that
type  to
be allocated ,  so its type is always i32..
 
   



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2012/9/21 amitjai <amitjaiswal.knit at gmail.com>:
> i am using llvm ,
> i did this
>
>                         if (  AllocaInst *allocInst >
dyn_cast<AllocaInst>(&*bbit)){
>                                 PointerType *p = allocInst->getType();
>                                 if (
p->getElementType()->isPointerTy()){
>                                         StringRef name >
allocInst->getName();
>                                         Type *type >
allocInst->getOperand(0)->getType();;
(AllocaInst)getOperand(0) is "array size". It must be
(ConstantInt)(i32 1) in most case.
Please try AllocaInst::getAllocatedType().

...Takumi