CODEWITHSUNDEEP
cllvm
user972276
user972276

Reputation: 3053

LLVM C API. How to determine if a LLVMValueRef is of integer or pointer type?

I am writing some C code using the LLVM C api. I need to check if an instruction value is of type int or is a pointer. What I have tried to do is use LLVMTypeOf(LLVMValueRef val) and just see if it equals ALL of the different types of int: LLVMInt1Type(), LLVMInt8Type(), LLVMInt16Type(), etc. I did not know how to figure out if it is a pointer type or not though and I think the method I was using to see if it was a integer is not working either.

Here is the API I have been referencing: http://llvm.org/doxygen/modules.html

Upvotes: 3

Views: 2008

Answers (2)

Yefei
Yefei

Reputation: 41

In c you can use LLVMGetTypeKind and LLVMTypeOf to determine what type it is.

For integer type, you can check with:

if(LLVMGetTypeKind(LLVMTypeOf(LLVMValueRef val))==LLVMIntegerTypeKind)

For pointer type, you can check with:

if(LLVMGetTypeKind(LLVMTypeOf(LLVMValueRef val))==LLVMPointerTypeKind)

Enum reference: LLVMTypeKind

Upvotes: 4

limi
limi

Reputation: 848

The C API is very limited.

I think you have to use C++ API or wrap the C++ API to C API by yourself.

For example,

extern "C" int LLVMTypeIsPointerTy(LLVMTypeRef ty){
      return ((llvm::Type*)ty)->isPointerTy();
}

Upvotes: 1

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