A non-POD cannot be in registers because its address gets taken for
constructors/destructors.
On 2/16/2013 11:36 AM, Johannes Pfau wrote:
While tracking down a bug in gdc I realized that gdc does nothing special for
POD/non-POD types yet. That at least caused one bug where the runtime va_arg
code expected a non-POD parameter to be passed on the stack but gcc passes it
in registers.
So to implement (non-)POD types correctly in GDC it would be good to know:
* Non-POD types can't be passed in registers for va_arg code. What's the
reason for this?
* Can Non-PODs be passed in registers to regular, non-variadic functions?
* Can Non-PODs be returned from functions in registers?
* The spec says the backend may create bit copies as convenient. Is this true
for Non-PODs as well?
* In GCC a non-POD type must always have an address (i.e it can never be in
registers). Is this true for D as well?
Is there anything more the backend must handle in regard to POD/non-POD types?
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