\" $NetBSD: dwarf_srclines.3,v 1.6 2024/03/03 17:37:32 christos Exp $
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\" Id: dwarf_srclines.3 3963 2022-03-12 16:07:32Z jkoshy
\"
Dd November 9, 2011
Dt DWARF_SRCLINES 3
Os
Sh NAME
Nm dwarf_srclines
Nd retrieve line number information for a debugging information entry
Sh LIBRARY
Lb libdwarf
Sh SYNOPSIS
In libdwarf.h
Ft int
Fo dwarf_srclines
Fa "Dwarf_Die die"
Fa "Dwarf_Line **lines"
Fa "Dwarf_Signed *nlines"
Fa "Dwarf_Error *err"
Fc
Sh DESCRIPTION
Function
Fn dwarf_srclines
returns line number information associated with a compilation unit.
Line number information is returned as an array of
Vt Dwarf_Line
descriptors.
Pp
Argument
Fa die
should reference a DWARF debugging information entry descriptor
with line number information, see
Xr dwarf 3 .
Argument
Fa lines
should point to a location that will hold a pointer to the returned array
of
Vt Dwarf_Line
descriptors.
Argument
Fa nlines
should point to a location that will hold the number of descriptors
returned.
If argument
Fa err
is not
Dv NULL ,
it will be used to store error information in case of an error.
Pp
The returned
Vt Dwarf_Line
descriptors may be passed to the other line number functions in the
API set to retrieve specific information about each source line.
Ss Memory Management
The memory area used for the array of
Vt Dwarf_Line
descriptors returned in argument
Fa lines
is owned by the
Lb libdwarf .
The application should not attempt to free this pointer.
Portable code should instead use
Fn dwarf_srclines_dealloc
to indicate that the memory may be freed.
Sh RETURN VALUES
Function
Fn dwarf_srclines
returns
Dv DW_DLV_OK
when it succeeds.
In case of an error, it returns
Dv DW_DLV_ERROR
and sets the argument
Fa err .
Sh EXAMPLES
To obtain an array of
Vt Dwarf_Line
descriptors and to retrieve the source file, line number, and virtual address
associated with each descriptor:
Bd -literal -offset indent
int n;
Dwarf_Die die;
Dwarf_Error de;
char *filename;
Dwarf_Line *lines;
Dwarf_Signed nlines;
Dwarf_Addr lineaddr;
Dwarf_Unsigned lineno;
/* variable "die" should reference a DIE for a compilation unit */
for (n = 0; n < nlines; n++) {
/* Retrieve the file name for this descriptor. */
if (dwarf_linesrc(lines[n], &filename, &de))
errx(EXIT_FAILURE, "dwarf_linesrc: %s",
dwarf_errmsg(de));
/* Retrieve the line number in the source file. */
if (dwarf_lineno(lines[n], &lineno, &de))
errx(EXIT_FAILURE, "dwarf_lineno: %s",
dwarf_errmsg(de));
/* Retrieve the virtual address for this line. */
if (dwarf_lineaddr(lines[n], &lineaddr, &de))
errx(EXIT_FAILURE, "dwarf_lineaddr: %s",
dwarf_errmsg(de));
}
Ed
Sh ERRORS
Function
Fn dwarf_srclines
can fail with:
Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
It Bq Er DW_DLE_ARGUMENT
One of the arguments
Fa die ,
Fa lines
or
Fa nlines
was
Dv NULL .
It Bq Er DW_DLE_NO_ENTRY
The compilation unit referenced by argument
Fa die
does not have associated line number information.
It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of
this function.
El
Sh SEE ALSO
Xr dwarf 3 ,
Xr dwarf_line_srcfileno 3 ,
Xr dwarf_lineaddr 3 ,
Xr dwarf_linebeginstatement 3 ,
Xr dwarf_lineblock 3 ,
Xr dwarf_lineendsequence 3 ,
Xr dwarf_lineno 3 ,
Xr dwarf_lineoff 3 ,
Xr dwarf_linesrc 3 ,
Xr dwarf_srcfiles 3 ,
Xr dwarf_srclines_dealloc 3
