callinst vs. invokeinst

Project Infrastructure LLVM Dev List Archives
1

What is the difference between a CallInst and an InvokeInst in LLVM? Is an InvokeInst a CallInst that can throw an exception?

Thanks,
Ryan

2

What is the difference between a CallInst and an InvokeInst in LLVM? Is
an InvokeInst a CallInst that can throw an exception?

Sort off. The return destination of a CallInst is implied .. the next
instruction. The return destination of an InvokeInst is explicit and
there are two of them: normal case and exceptional case. If the unwind
instruction is executed (during the call) it causes a stack unwind and
branch to the exceptional case. Normal returns (without unwind
instruction) return to the normal case.

The intention is for exception handling.

Reid.

3

They both allow the callee to throw an exception. Invoke is used when a callee is calling a function and wants to stop unwinding if it throws.

Some references:

http://llvm.org/docs/LangRef.html#i_invoke
http://llvm.org/pubs/2004-01-30-CGO-LLVM.html

-Chris