[llvm-dev] DIGlobalVariableExpression doc in langref

[Peng Yu via llvm-dev]

Hi,

I don't find DIGlobalVariableExpression in langref. Should it be
documented? Could anybody explain what it is?

https://llvm.org/docs/LangRef.html

In one ll file converted from bitcode, I mostly see something like this.

!8273 = !DIGlobalVariableExpression(var: !8274, expr: !DIExpression())

Only one looks like this.

!8945 = !DIGlobalVariableExpression(var: !8946, expr:
!DIExpression(DW_OP_constu, 44, DW_OP_stack_value))

Why DIExpression is mostly empty?

-- 
Regards,
Peng