================
@@ -5401,6 +5409,8 @@ std::string CGDebugInfo::GetName(const Decl *D, bool
Qualified) const {
// feasible some day.
return TA.getAsIntegral().getBitWidth() <= 64 &&
IsReconstitutableType(TA.getIntegralType());
+ case TemplateArgument::StructuralValue:
+ return false;
----------------
dwblaikie wrote:
I did finally take a look at this - I think the Clang side of things is fine -
if anything improvements could be made to LLVM to be able to lower constants to
DWARF for a wider variety of values.
eg: For the `float` example, the IR is:
```
!8 = !DITemplateValueParameter(name: "F", type: !9, value: float 1.000000e+00)
```
But the DWARF backend can't handle the float constant - the handling is in
`DwarfUnit::constructTemplateValueParameterDIE` (in
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp) and currently only handles
ConstantInt (for basic stuff - bools, ints, etc) and GlobalValue (for pointer
non-type template parameters).
So for these new floats and such, the DWARF doesn't include the value, only the
type.
GCC uses this encoding, for instance:
```
0x0000002b: DW_TAG_template_value_parameter [3] (0x0000001e)
DW_AT_name [DW_FORM_string] ("F")
DW_AT_type [DW_FORM_ref4] (cu + 0x004d => {0x0000004d}
"float")
DW_AT_const_value [DW_FORM_block1] (<0x04> 00 00 80 3f )
```
https://github.com/llvm/llvm-project/pull/78041
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