Re: [RFA] dwarf2expr.c: Prepare for eventual DW_OP_piece support

[Kevin Buettner <kevinb@redhat.com>]

On Apr 23,  6:05pm, Kevin Buettner wrote:

> ... prepares execute_stack_op() for eventual DW_OP_piece
> support.

I have a patch which adds _limited_ DW_OP_piece support.  It finds the
various "pieces" (all of which must be registers) in the location
expression and then calls an architecture specific method to determine
whether, given a single register number, gdb can reliably fetch the
necessary pieces.  The architecture dependent method simply checks to
make sure that the register numbers (the pieces) are in the correct
order and it returns the register number that must be used in order to
properly fetch the pieces (or -1 if it can't be done).

This support doesn't handle the interesting case of an object being
split between a register and memory or even of the slightly less
interesting case of non-contiguous registers, but it will be adequate
for most DW_OP_piece expressions that gcc will emit in the near
future.  Anyway... given the limitations outlined above, is there
interest in having me submit this patch? 

Kevin