[llvm-commits] [llvm] r86897 - /llvm/trunk/lib/CodeGen/AsmPrinter/DwarfException.cpp

[Dan Gohman]

On Nov 12, 2009, at 11:36 AM, Bill Wendling wrote:

> On Nov 12, 2009, at 11:27 AM, Duncan Sands wrote:
> 
>> A call can be "nounwind" without the
>> callee necessarily being nounwind.  Your patch only catches the case of the
>> callee being nounwind.  The CallSite doesNotThrow method checks for both of
>> these possibilities.  I think what should happen is: at the moment of lowering
>> the IR to SDAG nodes, check "doesNotThrow" on calls and set a corresponding
>> flag in the SDAG node.  Check this flag when outputting the dwarf table.
> 
> Possible. Though at the point of DWARF generation, we don't have the SDAG nodes anymore. So it would have to be propagated to the CALL instruction.

Crazy idea: would it make sense to extend MachineMemOperand
to be able to describe which Function is being called in
a call MachineInstr?

Dan