---
name: "dwarf_add_line_entry"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/dwarf_add_line_entry"
---

# dwarf\_add\_line\_entry(3)

add a line number information entry to a producer instance

## NAME

**dwarf\_add\_line\_entry** – add a line number information entry to a producer instance

## LIBRARY

library “libdwarf”

## SYNOPSIS

**#include \<libdwarf.h\>**

*Dwarf\_Unsigned*\

**dwarf\_add\_line\_entry**(*Dwarf\_P\_Debug dbg*, *Dwarf\_Unsigned filendx*, *Dwarf\_Addr off*, *Dwarf\_Unsigned lineno*, *Dwarf\_Signed column*, *Dwarf\_Bool is\_stmt*, *Dwarf\_Bool basic\_block*, *Dwarf\_Error \*err*);

## DESCRIPTION

Function **dwarf\_add\_line\_entry**() adds a line number information entry to a DWARF producer instance.

Argument *dbg* should reference a DWARF producer instance allocated using [dwarf\_producer\_init(3)](/dwarf_producer_init/3.md) or [dwarf\_producer\_init\_b(3)](/dwarf_producer_init_b/3.md).

Argument *filendx* specifies the index of the source file that contains the source line in question. Valid source file indices are those returned by the function [dwarf\_add\_file\_decl(3)](/dwarf_add_file_decl/3.md).

Argument *off* specifies a relocatable program address. The ELF symbol to be used for relocation is set by a prior call to the function [dwarf\_lne\_set\_address(3)](/dwarf_lne_set_address/3.md).

Argument *lineno* specifies the line number of the source line.

Argument *column* specifies the column number within the source line.

If the argument *is\_stmt* is set to true, it indicates that the instruction at the address specified by argument *off* is a recommended breakpoint location, i.e., the first instruction in the instruction sequence generated by the source line.

If the argument *basic\_block* is set to true, it indicates that the instruction at the address specified by argument *off* is the first instruction of a basic block.

If argument *err* is not NULL, it will be used to store error information in case of an error.

## RETURN VALUES

On success, function **dwarf\_add\_line\_entry**() returns DW\_DLV\_OK. In case of an error, function **dwarf\_add\_line\_entry**() returns DW\_DLV\_NOCOUNT and sets the argument *err*.

## EXAMPLES

To add line number information to the producer instance, use:

```
Dwarf_P_Debug dbg;
Dwarf_Error de;
Dwarf_Unsigned dir, filendx;
/* ... assume dbg refers to a DWARF producer instance ... */
dir = dwarf_add_directory_decl(dbg, "/home/foo", &de);
if (dir == DW_DLV_NOCOUNT)
	errx(EXIT_FAILURE, "dwarf_add_directory_decl failed: %s",
	    dwarf_errmsg(-1));
filendx = dwarf_add_file_decl(dbg, "bar.c", dir, 0, 1234, &de);
if (filendx == DW_DLV_NOCOUNT)
	errx(EXIT_FAILURE, "dwarf_add_file_decl failed: %s",
	    dwarf_errmsg(-1));
if (dwarf_lne_set_address(dbg, 0x4012b0, 12, &de) != DW_DLV_OK)
	errx(EXIT_FAILURE, "dwarf_lne_set_address failed: %s",
	    dwarf_errmsg(-1));
if (dwarf_add_line_entry(dbg, filendx, 10, 258, 0, 1, 1, &de) !=
    DW_DLV_OK)
	errx(EXIT_FAILURE, "dwarf_add_line_entry failed: %s",
	    dwarf_errmsg(-1));
```

## ERRORS

Function **dwarf\_add\_line\_entry**() can fail with:

- \[DW\_DLE\_ARGUMENT\]

  Argument *dbg* was NULL.

- \[DW\_DLE\_ARGUMENT\]

  The function [dwarf\_lne\_set\_address(3)](/dwarf_lne_set_address/3.md) was not called before calling this function.

- \[DW\_DLE\_MEMORY\]

  An out of memory condition was encountered during the execution of the function.

## SEE ALSO

[dwarf(3)](/dwarf/3.md), [dwarf\_add\_directory\_decl(3)](/dwarf_add_directory_decl/3.md), [dwarf\_add\_file\_decl(3)](/dwarf_add_file_decl/3.md), [dwarf\_lne\_end\_sequence(3)](/dwarf_lne_end_sequence/3.md), [dwarf\_lne\_set\_address(3)](/dwarf_lne_set_address/3.md), [dwarf\_producer\_init(3)](/dwarf_producer_init/3.md), [dwarf\_producer\_init\_b(3)](/dwarf_producer_init_b/3.md)