llvm dev - Dec 2013 - [LLVMdev] LLVM Type Int32Ty Problems & LLVMContextImpl.h Problems

Hello! I'm newer to LLVM development . I'm trying to use AllocaInst
class
to construct an instruction ,  I wrote like this:

    AllocaInst *alloc = new AllocaInst(llvm::Int32Ty, 0,
"indexLoc",i);

but it return the error:

 error: use of undeclared identifier 'llvm::Int32Ty'
                  AllocaInst *alloc = new AllocaInst(Int32Ty, 0,
"indexLoc",i);

I found that the Int32Ty is defined in the LLVMContextImpl.h , but I can
not find it in the llvm include directory.

I installed llvm in  "/usr/local/llvm"  but there is no
"LLVMContextImpl.h"
in /usr/local/llvm/include/llvm/IR (LLVMContext.h exists)

Does this mean that the llvm is not installed correctly? What should I do
to fix it? Thank you~
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> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu]
> On Behalf Of Jin Huang
> Subject: [LLVMdev] LLVM Type Int32Ty Problems & LLVMContextImpl.h
Problems
>    AllocaInst *alloc = new AllocaInst(llvm::Int32Ty, 0,
"indexLoc",i);
I think you should be using llvm::Type::getInt32Ty(Context), not llvm::Int32Ty,
which is for internal LLVM usage.

Also, using llvm::IRBuilder<> is a whole lot easier and safer than trying
to create instruction objects directly.

 - Chuck

llvm::Type::getInt32Ty(Context) really works ,and I found a lot of useful
functions to create instructions in llvm::IRBuilder<>.

Thank you! Chuck


2013/12/13 Caldarale, Charles R <Chuck.Caldarale at unisys.com>
> > From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu]
> > On Behalf Of Jin Huang
> > Subject: [LLVMdev] LLVM Type Int32Ty Problems & LLVMContextImpl.h
> Problems
>
> >    AllocaInst *alloc = new AllocaInst(llvm::Int32Ty, 0,
"indexLoc",i);
>
> I think you should be using llvm::Type::getInt32Ty(Context), not
> llvm::Int32Ty, which is for internal LLVM usage.
>
> Also, using llvm::IRBuilder<> is a whole lot easier and safer than
trying
> to create instruction objects directly.
>
>  - Chuck
>
>
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