py/compile: Allow NULL emitter table entries.

This commit fixes a regression introduced in
1b92bda5b8e5e2db8e57c4b7134930e52bc5207a, where a new architecture was
added to mpy-cross but it had no matching native emitter exists.

The result was that the architecture emitter entry point would be
correctly calculated according to the native architecture index, but if
the emitters entry points table was not updated to match the new number
of architectures an out of bound access may be performed.

Unfortunately adding RV64IMC shifted the debug emitter index further
down the table, and that table wasn't updated to reflect the lack of an
emitter for RV64.  Adding a NULL entry there would cause a NULL pointer
access as there was no need to perform any check about the emitter entry
point function's validity until now.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

0 files changed, 0 insertions, 0 deletions