[PATCH] D7895: Anonymous namespaces are missing import DW_TAG_imported_module.

[David Blaikie via llvm-commits]

On Tue, Aug 18, 2015 at 10:28 AM, Robinson, Paul <
Paul_Robinson at playstation.sony.com> wrote:

> Sorry I wasn't clear - I was referring to the ABI lowering of C++ by value
> parameters.
>
> struct foo { foo(const foo&); int i; };
> struct bar { int i; };
> void func(foo, bar) { }
>
> foo and bar are passed quite differently in the ABI
>
> And the formal parameters are described quite differently in the DWARF,
>

What differences are you referring to? They're described quite the same.
The only difference in the two parameters is their DW_AT_location, and you
can't rely on that for the calling convention - it just describes where to
find the variable once you're past the prologue. In LLVM, that's often
/just/ the alloca we copy the value into, not the register the parameter
was passed in.




> meaning the debugger doesn't need special knowledge of the ABI to
> interpret the DWARF correctly.  I still don't see how this is relevant to
> the discussion at hand.
>
> --paulr
>
>
>
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