[LLVMdev] How can I create CallInst with a pointer to function
gordonhenriksen at me.com
Wed Oct 8 20:55:52 PDT 2008
On 2008-10-08, at 12:56, Andrii Vasyliev wrote:
> I mean when I have in my program pointer to a function how should I
> build IR to call the function by the pointer?
> Or how can I create llvm::Function with a pointer to a function?
If you're just asking how to construct an indirect call, then calling
a LoadInst* or Argument* or any other Value* is no different than
calling a Function*.
If your goal is to take an arbitrary function pointer (possibly
precompiled) from the compiler's context and statically embed a call
to it in the program you're building, then you can do this in a couple
of ways. Both only work in a JIT context, for reasons that should be
The first is to use something like this:
Value *value = ConstantExpr::getIntToPtr(
Secondly, you can create a Function* with no body (a declaration) and
then use ExecutionEngine::addGlobalMapping.
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