llvm dev - Jul 2010 - [LLVMdev] "Cannot call createPass on PassInfo without default ctor!"

While trying to add a pass to the ARM back end I'm getting quite a lot of
this assertion failure:

Pass.cpp:255: llvm::Pass* llvm::PassInfo::createPass() const: Assertion
`NormalCtor && "Cannot call createPass on PassInfo without default
ctor!"' failed.

A simple way to get it is to add two lines to ARMTargetMachine.cpp:

#include "llvm/Transforms/Scalar.h"

and

  PM.add(createSinkingPass());

in addInstSelector just before this line:

  PM.add(createARMISelDag(*this, OptLevel));

Then run anything through the ARM back end, for example:

clang -cc1 -triple thumbv7-eabi -O3 -target-cpu cortex-a8 x.c -S -o x.s

The interesting thing is that the assertion failure doesn't happen during
the call to createSinkingPass(), which I added, but during the call to
createARMISelDag in the following line.

Can anyone tell me what's going on here?

(I've also tried adding the Hello pass, with the same result.)

Thanks,

Edmund
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Hello, Edmund
>  PM.add(createSinkingPass());
Is your pass a MachineFunctionPass or just FunctionPass ?

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University