LINENUM(4) LINENUM(4)
NAME
linenum - line number entries in a common object file
SYNOPSIS
#include <linenum.h>
DESCRIPTION
The cc command 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(1)]. 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.
struct lineno
{
union
{
long l_symndx ;
long l_paddr ;
} l_addr ;
unsigned short l_lnno ;
#if defined (m88k)
char l_pad1;
char l_pad2;
#endif
} ;
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
l_symndx. Otherwise, l_lnno is non-zero, and l_paddr is the
physical address of the code for the referenced line. Thus
the overall structure is the following:
l_addr l_lnno
function symtab index 0
physical address line
physical address line
Page 1 May 1989
LINENUM(4) LINENUM(4)
...
function symtab index 0
physical address line
physical address line
...
SEE ALSO
cc(1), sdb(1), a.out(4).
Page 2 May 1989