[PATCH] Allocate stack storage for .block_descriptor and captured self.

[Eric Christopher]

On Mon, Feb 25, 2013 at 5:02 PM, John McCall <rjmccall at apple.com> wrote:

> On Feb 25, 2013, at 4:55 PM, Adrian Prantl <aprantl at apple.com> wrote:
> > here’s another patch for review:
> >
> > Allocate stack storage for .block_descriptor and captured self.
> > This way the register allocator will not optimize away the the
> > debug info for captured variables.
>
> Allocating stack storage is not the right way to fix this problem.
> The frontend is emitting the right intrinsics to say that the argument
> is being kept in an LLVM value, not in memory.  If that's not working,
> then basically all optimized debug info is useless.
>
>
That's pretty accurate. The backend in a lot of places is depending upon an
alloca existing in order to get a location for a variable. To make optimized
debug info work we're going to need to fix that assumption.

-eric
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