[Dwarf-discuss] address of variable out of range of its function?

[Frederic RISS]

On Mon, 2006-10-09 at 02:38 +0900, Jun Koi wrote:
> 
> <1><40747>      DW_TAG_subprogram
>                 DW_AT_name                  do_unlinkat
>                 DW_AT_low_pc                0xc0161640
> <2><40822>      DW_TAG_variable
>                 DW_AT_name                  name
>                 DW_AT_location              <loclist with 1 entries
> follows>
>                         [ 0]<lowpc=0x2ccd><highpc=0x2cd7>DW_OP_reg2
> 
> As you see, variable "name" has only 1 loclist entry, and can be
> accessed only via reg2.
> However, while the function do_unlinkat() ranges in [0xc0161640,
> 0xc0161782], the variable "name" within the function can only be
> accessed if the PC is within [0xc0161640 + 0x2ccd, 0xc0161640 +
> 0x2cd7] == [0xc0164317, 0xc016430d], which is way out of the range of
> the do_unlinkat() function (??). That means there is no way to access
> to it from within function (??) 

The loclist ranges are relative to the compilation unit low_pc, not to
the function's one IIRC.

Fred.