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DWARF_SRCLINES(3)          Library Functions Manual          DWARF_SRCLINES(3)

NAME
     dwarf_srclines - retrieve line number information for a debugging
     information entry

LIBRARY
     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS
     #include <libdwarf.h>

     int
     dwarf_srclines(Dwarf_Die die, Dwarf_Line **lines, Dwarf_Signed *nlines,
         Dwarf_Error *err);

DESCRIPTION
     Function dwarf_srclines() returns line number information associated with
     a compilation unit.  Line number information is returned as an array of
     Dwarf_Line descriptors.

     Argument die should reference a DWARF debugging information entry
     descriptor with line number information, see dwarf(3).  Argument lines
     should point to a location that will hold a pointer to the returned array
     of Dwarf_Line descriptors.  Argument nlines should point to a location
     that will hold the number of descriptors returned.  If argument err is
     not NULL, it will be used to store error information in case of an error.

     The returned Dwarf_Line descriptors may be passed to the other line
     number functions in the API set to retrieve specific information about
     each source line.

   Memory Management
     The memory area used for the array of Dwarf_Line descriptors returned in
     argument lines is owned by the DWARF Access Library (libdwarf, -ldwarf).
     The application should not attempt to free this pointer.  Portable code
     should instead use dwarf_srclines_dealloc() to indicate that the memory
     may be freed.

RETURN VALUES
     Function dwarf_srclines() returns DW_DLV_OK when it succeeds.  In case of
     an error, it returns DW_DLV_ERROR and sets the argument err.

EXAMPLES
     To obtain an array of Dwarf_Line descriptors and to retrieve the source
     file, line number, and virtual address associated with each descriptor:

           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 */

           if (dwarf_srclines(die, &lines, &nlines, &de) != DW_DLV_OK)
                   errx(EXIT_FAILURE, "dwarf_srclines: %s", dwarf_errmsg(de));

           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));
                   }

ERRORS
     Function dwarf_srclines() can fail with:

     [DW_DLE_ARGUMENT]       One of the arguments die, lines or nlines was
                             NULL.

     [DW_DLE_NO_ENTRY]       The compilation unit referenced by argument die
                             does not have associated line number information.

     [DW_DLE_MEMORY]         An out of memory condition was encountered during
                             the execution of this function.

SEE ALSO
     dwarf(3), dwarf_line_srcfileno(3), dwarf_lineaddr(3),
     dwarf_linebeginstatement(3), dwarf_lineblock(3),
     dwarf_lineendsequence(3), dwarf_lineno(3), dwarf_lineoff(3),
     dwarf_linesrc(3), dwarf_srcfiles(3), dwarf_srclines_dealloc(3)

NetBSD 10.99                   November 9, 2011                   NetBSD 10.99