[LLVMdev] Question on using GlobalVariable as function pointer

[ChiaLun]

Hi everyone,

  I am trying to have an call instruction that calls global variable


The first thing I do is

gv = new llvm::GlobalVariable( *(tb->getModule()),
		                          fty,
		                          false,GlobalValue::InternalLinkage,0,
		                          "",0,0,0);

fty : i32 ({ i32, [32 x i32] }*)


I get stuck here, the fifth argument is the initializer which is a LLVM
Constant,

I do not know how to describe a function pointer as a constant.

so currently, I just pass false to it.

then I use 

myjit->getOrEmitGlobalVariable(gv); // myjit is LLVM ExecutionEngine


but, I get an error

LLVM ERROR: Could not resolve external global address

However, when I modify fty to be an integer type or some primitive type,
there is no error.

Since LLVM demo page is closed, so I am not sure how to do it correctly.


Have A Nice Day

Chia Lun Liu



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