[LLVMdev] Creating Pointer Constants

[Nyx]

Hello,

I am writing a JIT compiler for a subset of the Matlab language and as a
part of my implementation, I would like to be able to pass a constant
pointer to a native function I'm calling.

Right now, this is what I do:

llvm::Constant* constInt = llvm::ConstantInt::get(llvm::Type::Int64Ty,
(int64)thePointer);
llvm::Value* constPtr = llvm::ConstantExpr::getIntToPtr(constInt,
llvm::PointerType::getUnqual(llvm::Type::Int32Ty));
	
builder.CreateCall(my_function, constPtr);

The resulting IR call looks like this:

call void @nativeFunc(i32* inttoptr (i64 146876396 to i32*))

I'm just wondering if there is a better way to approach this. Casting a
pointer to a signed integer and back to a pointer looks both hack-ish, and
potentially risky (what happens if the address falls in the negative range
of the signed integer?). Unfortunately, I couldn't call a pointer constant
type in the LLVM doxygen documentation.

Thank you for your time,

- Maxime
-- 
View this message in context: http://www.nabble.com/Creating-Pointer-Constants-tp22401381p22401381.html
Sent from the LLVM - Dev mailing list archive at Nabble.com.