DWARF_ADD_ARANGE(3)

DWARF_ADD_ARANGE(3) | Library Functions Manual | DWARF_ADD_ARANGE(3)

# NAME

`dwarf_add_arange`, `dwarf_add_arange_b` —
add address range information to a DWARF producer instance

# LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

# SYNOPSIS

`#include <libdwarf.h>`

Dwarf_Unsigned
`dwarf_add_arange`(Dwarf_P_Debug dbg, Dwarf_Addr start, Dwarf_Unsigned length, Dwarf_Signed symbol_index, Dwarf_Error *err);

Dwarf_Unsigned
`dwarf_add_arange_b`(Dwarf_P_Debug dbg, Dwarf_Addr start, Dwarf_Unsigned length, Dwarf_Unsigned symbol_index, Dwarf_Unsigned end_symbol_index, Dwarf_Addr offset_from_end_symbol, Dwarf_Error *err);

# DESCRIPTION

Function `dwarf_add_arange_b`() adds an address range entry to a producer instance.

Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3).

Argument start specifies the relocatable start address of the address range.

Argument length specifies the length of the address range.

Argument symbol_index specifies the ELF symbol index of the first symbol to be used for relocation.

Argument end_symbol_index specifies the ELF symbol index of the second symbol to be used for relocation.

- If argument end_symbol_index is not 0, the `DW_DLC_SYMBOLIC_RELOCATIONS` flag should have been set on the DWARF producer instance. The address value specified by argument start will be treated as an offset value from the first symbol, and the argument offset_from_end_symbol should hold an offset value from the second symbol. Application code can retrieve the relocation entries for the symbol pair by calling function dwarf_get_relocation_info(3). The relocation entry for the first symbol will have type `dwarf_drt_first_of_length_pair` and the relocation entry for the second symbol will have type `dwarf_drt_second_of_length_pair`.
- If argument end_symbol_index is 0, argument offset_from_end_symbol will be ignored and only one symbol is used for relocation.

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

Function `dwarf_add_arange`() is deprecated. It is similar to function `dwarf_add_arange_b`() except that it cannot handle all possible symbol index values and supports only one relocation symbol.

# RETURN VALUES

On success, these functions return a non-zero value. In case of an error, these functions return 0 and set the argument err.

# ERRORS

These functions can fail with:

[`DW_DLE_ARGUMENT`]
  Argument dbg was `NULL`.
[`DW_DLE_ARGUMENT`]
  Argument end_symbol_index was non-zero, but the flag `DW_DLC_SYMBOLIC_RELOCATIONS` was not set on the producer instance.
[`DW_DLE_MEMORY`]
  An out of memory condition was encountered during the execution of the function.

# SEE ALSO

dwarf(3), dwarf_get_relocation_info(3), dwarf_producer_init(3), dwarf_producer_init_b(3)

September 18, 2011 | NetBSD 10.1