1.\" Copyright (c) 2010 Joseph Koshy. All rights reserved. 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" This software is provided by Joseph Koshy ``as is'' and 13.\" any express or implied warranties, including, but not limited to, the 14.\" implied warranties of merchantability and fitness for a particular purpose 15.\" are disclaimed. in no event shall Joseph Koshy be liable 16.\" for any direct, indirect, incidental, special, exemplary, or consequential 17.\" damages (including, but not limited to, procurement of substitute goods 18.\" or services; loss of use, data, or profits; or business interruption) 19.\" however caused and on any theory of liability, whether in contract, strict 20.\" liability, or tort (including negligence or otherwise) arising in any way 21.\" out of the use of this software, even if advised of the possibility of 22.\" such damage. 23.\" 24.\" $Id: dwarf_srclines.3 3644 2018-10-15 19:55:01Z jkoshy $ 25.\" 26.Dd November 9, 2011 27.Dt DWARF_SRCLINES 3 28.Os 29.Sh NAME 30.Nm dwarf_srclines 31.Nd retrieve line number information for a debugging information entry 32.Sh LIBRARY 33.Lb libdwarf 34.Sh SYNOPSIS 35.In libdwarf.h 36.Ft int 37.Fo dwarf_srclines 38.Fa "Dwarf_Die die" 39.Fa "Dwarf_Line **lines" 40.Fa "Dwarf_Signed *nlines" 41.Fa "Dwarf_Error *err" 42.Fc 43.Sh DESCRIPTION 44Function 45.Fn dwarf_srclines 46returns line number information associated with a compilation unit. 47Line number information is returned as an array of 48.Vt Dwarf_Line 49descriptors. 50.Pp 51Argument 52.Ar die 53should reference a DWARF debugging information entry descriptor 54with line number information, see 55.Xr dwarf 3 . 56Argument 57.Ar lines 58should point to a location that will hold a pointer to the returned array 59of 60.Vt Dwarf_Line 61descriptors. 62Argument 63.Ar nlines 64should point to a location that will hold the number of descriptors 65returned. 66If argument 67.Ar err 68is not NULL, it will be used to store error information in case of an 69error. 70.Pp 71The returned 72.Vt Dwarf_Line 73descriptors may be passed to the other line number functions in the 74API set to retrieve specific information about each source line. 75.Ss Memory Management 76The memory area used for the array of 77.Vt Dwarf_Line 78descriptors returned in argument 79.Ar lines 80is owned by the 81.Lb libdwarf . 82The application should not attempt to free this pointer. 83Portable code should instead use 84.Fn dwarf_srclines_dealloc 85to indicate that the memory may be freed. 86.Sh RETURN VALUES 87Function 88.Fn dwarf_srclines 89returns 90.Dv DW_DLV_OK 91when it succeeds. 92In case of an error, it returns 93.Dv DW_DLV_ERROR 94and sets the argument 95.Ar err . 96.Sh EXAMPLES 97To obtain an array of 98.Vt Dwarf_Line 99descriptors and to retrieve the source file, line number, and virtual address 100associated with each descriptor: 101.Bd -literal -offset indent 102int n; 103Dwarf_Die die; 104Dwarf_Error de; 105char *filename; 106Dwarf_Line *lines; 107Dwarf_Signed nlines; 108Dwarf_Addr lineaddr; 109Dwarf_Unsigned lineno; 110 111/* variable "die" should reference a DIE for a compilation unit */ 112 113if (dwarf_srclines(die, &lines, &nlines, &de) != DW_DLV_OK) 114 errx(EXIT_FAILURE, "dwarf_srclines: %s", dwarf_errmsg(de)); 115 116for (n = 0; n < nlines; n++) { 117 /* Retrieve the file name for this descriptor. */ 118 if (dwarf_linesrc(lines[n], &filename, &de)) 119 errx(EXIT_FAILURE, "dwarf_linesrc: %s", 120 dwarf_errmsg(de)); 121 122 /* Retrieve the line number in the source file. */ 123 if (dwarf_lineno(lines[n], &lineno, &de)) 124 errx(EXIT_FAILURE, "dwarf_lineno: %s", 125 dwarf_errmsg(de)); 126 /* Retrieve the virtual address for this line. */ 127 if (dwarf_lineaddr(lines[n], &lineaddr, &de)) 128 errx(EXIT_FAILURE, "dwarf_lineaddr: %s", 129 dwarf_errmsg(de)); 130 } 131.Ed 132.Sh ERRORS 133Function 134.Fn dwarf_srclines 135can fail with: 136.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" 137.It Bq Er DW_DLE_ARGUMENT 138One of the arguments 139.Ar die , 140.Ar lines 141or 142.Ar nlines 143was NULL. 144.It Bq Er DW_DLE_NO_ENTRY 145The compilation unit referenced by argument 146.Ar die 147does not have associated line number information. 148.It Bq Er DW_DLE_MEMORY 149An out of memory condition was encountered during the execution of 150this function. 151.El 152.Sh SEE ALSO 153.Xr dwarf 3 , 154.Xr dwarf_line_srcfileno 3 , 155.Xr dwarf_lineaddr 3 , 156.Xr dwarf_linebeginstatement 3 , 157.Xr dwarf_lineblock 3 , 158.Xr dwarf_lineendsequence 3 , 159.Xr dwarf_lineno 3 , 160.Xr dwarf_lineoff 3 , 161.Xr dwarf_linesrc 3 , 162.Xr dwarf_srcfiles 3 , 163.Xr dwarf_srclines_dealloc 3 164