[m-dev.] RTTI question?

[Peter Ross]

On Thu, Feb 07, 2002 at 03:36:09AM +1100, Fergus Henderson wrote:
> On 06-Feb-2002, Peter Ross <peter.ross at miscrit.be> wrote:
> >     ldsfld  object[]
> >             ['mercury']'mercury'.'private_builtin__cpp_code'.'mercury_code'::'private_builtin__type_info_typeclass_info_1__type0_8___void_0'
> >     castclass   object
> >     stelem.ref
> > 
> > Where does private_builtin__type_info_typeclass_info_1__type0_8___void_0
> > come from?
> 
> That mangled name means the type_info for the type
> `private_builtin:typeclass_info(builtin:void)', I think.
> 
> It should be generated as a pseudo_type_info rtti_data by
> the RTTI code (type_ctor_info.m?),
> then converted to MLDS by rtti_to_mlds.m,
> then converted to IL by mlds_to_il(asm).m.
> 
> > As it is not being generated.
> 
> One thing to check is that the problem might be related to
> whether or not `void' is module qualified with `builtin__'.
> 
I have tracked the problem down some more, but I am not sure what has
changed to cause it to go wrong.

Here is the snippet of code that causes the problem.

	.line 0 ''
	ldsfld	object[]
		['mercury']'mercury'.'private_builtin'.'mercury_code'::'private_builtin__field_types_sample_typeclass_info_0_0'
	dup
	ldc.i4.0
	ldsfld	object[]
		['mercury']'mercury'.'private_builtin__cpp_code'.'mercury_code'::'private_builtin__type_info_typeclass_info_1__type0_8___void_0'
	castclass	object
	stelem.ref
	pop

The problem is not that the name is wrong, but that the namespace is
wrong.  Here we refer to 'private_builtin__cpp_code' instead of
'private_builtin'.  This incorrect namespace is being done by
mangle_dataname_module in make_static_fieldref.  However none of this
code has changed in a long time, so why suddenly is this not working?
Any ideas?

It used to work on Jan 16.  With my investigations I can't see anything
which has directly caused this problem.  Does anyone have any ideas?
The easiest fix is to special case the code for mangle_dataname_module
for this case but I am sure that this is wrong for more then one reason.
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