A/UX® Programmer's Reference Sections

linenum(4) linenum(4)
NAME
linenum -line number entries in a common object file
SYNOPSIS
finclude
DESCRIPTION
The C compiler generates an entry in the object file for each C
source line on which a breakpoint is possible (when invoked with
the -g option; see cc(I». Users can then reference line numbers
when using the appropriate software test system (see sdb(1».
The structure of these line number entries appears below.
1
struct lineno
{
union
long l_symndx ;
long lyaddr ;
1 addr
unsigned short l_lnno ;
} ;
Numbering starts with one for each function. The initial line
number entry for a function has l_lnno equal to zero, and the
symbol table index of the function's entry is in 1 symndx. Otherwise,
l_lnno is non-zero, and lyaddr is the physical address
of the code for the referenced line. Thus the overall structure
is the following:
1 addr 1 lnno
function symtab index 0
physical address line
physical address line
function symtab index 0
physical address line
physical address line
February, 1990
RevisionC