[LLVMdev] the called function equal NULL
huwei8717
huwei8717 at yahoo.com.cn
Mon Nov 29 17:34:58 PST 2010
Than you John, It's very nice of you.
Best Regards
2010-11-30
-Wei
发件人: John McCall
发送时间: 2010-11-30 09:26:17
收件人: huwei8717
抄送: llvmdev
主题: Re: [LLVMdev] the called function equal NULL
On Nov 29, 2010, at 5:22 PM, huwei8717 wrote:
Hi,
I have a llvm-pass in hand written by other people. There are following statements that I couldn't understand:
-------------------------------program----------------------------------------------------
...
if (isa<CallInst>(inst) || isa<InvokeInst>(inst)) {
const CallSite cs(inst);
if (cs.getCalledFunction() == NULL)
return dealAtIndirectCall(cs);
else
return dealAtDirectCall(cs);
}
...
-------------------------------------------------------------------------------------------
My question is:
When does the called function equal NULL, could you give an example? I mean what kind of call in source code could change to this case in llvm-IR, could you give an example?
A call to a value of function-pointer type, e.g.
void callit(void (*f)()) { f(); }
Virtual calls in C++ would also have no known called function.
John.
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