llvm dev - May 2011 - [LLVMdev] DWARF not being generated for local variable, though MD looks right(?)

On 2 May 2011 17:36, Devang Patel <dpatel at apple.com>
wrote:
> Here there is not any instruction (ignoring dbg intrinsics) with line
number
> information. If you add !dbg !7 at the end of 'ret' then it'll
work.
Hi Devang,

Why does type/variable information depend on line information?

cheers,
--renato

On May 2, 2011, at 1:39 PM, Renato Golin wrote:
> On 2 May 2011 17:36, Devang Patel <dpatel at apple.com> wrote:
> Why does type/variable information depend on line information?
You need line number information to map source code to instructions. Otherwise,
you'll have a function and variable info in debug info but a debugger
won't know which instructions belong to given function and what's the
range of a variable.

-
Devang

On 2 May 2011 22:39, Devang Patel <dpatel at apple.com>
wrote:
> You need line number information to map source code to instructions.
Otherwise, you'll have a function and variable info in debug info but a
debugger won't know which instructions belong to given function and
what's the range of a variable.
That can be worked out from the debug_info and debug_loc without
requiring debug_line info. (not the instruction vs. function, but all
the rest).

Not that debuggers do know that, and not that it would be useful for
debugging... But I don't see a strong point to intentionally omit
them.

Just a thought...

cheers,
--renato