DWARF_GET_ARANGE_INFO(3) | Library Functions Manual | DWARF_GET_ARANGE_INFO(3)

# NAME

`dwarf_get_arange_info` — extract address range information from a descriptor

# LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

# SYNOPSIS

`#include <libdwarf.h>`

int
`dwarf_get_arange_info`(Dwarf_Arange ar, Dwarf_Addr *start, Dwarf_Unsigned *length, Dwarf_Off *cu_die_offset, Dwarf_Error *err);

# DESCRIPTION

Function `dwarf_get_arange_info`() extracts address range information from a Dwarf_Arange descriptor.

Argument ar should reference a valid Dwarf_Arange descriptor returned by function dwarf_get_aranges(3).

Argument start should point to a location which will hold the start value of the address range associated with the descriptor.

Argument length should point to a location which will hold the length in bytes of the address range associated with the descriptor.

Argument cu_die_offset should point to a location which will be set to an offset, relative to the “.debug_info” section, of the first debugging information entry in the compilation unit associated with argument ar.

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

# RETURN VALUES

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

# EXAMPLES

To loop through all the address lookup table entries, use:

    Dwarf_Debug dbg;
    Dwarf_Addr start;
    Dwarf_Arange *aranges;
    Dwarf_Off die_off;
    Dwarf_Signed i, cnt;
    Dwarf_Unsigned length;
    Dwarf_Error de;

    if (dwarf_get_aranges(dbg, &aranges, &cnt, &de) != DW_DLV_OK)
    	errx(EXIT_FAILURE, "dwarf_get_aranges: %s",
    	    dwarf_errmsg(de));
    for (i = 0; i < cnt; i++) {
    	if (dwarf_get_arange_info(aranges[i], &start, &length,
    	    &die_off, &de) != DW_DLV_OK) {
    		warnx("dwarf_get_arange_info: %s",
    		    dwarf_errmsg(de));
    		continue;
    	}
    	/* Do something with the returned information. */
    }

# ERRORS

Function `dwarf_get_arange_info`() can fail with:

[`DW_DLE_ARGUMENT`]
  One of the arguments ar, start, length or cu_die_offset was `NULL`.

# SEE ALSO

dwarf(3), dwarf_get_arange(3), dwarf_get_arange_cu_header_offset(3), dwarf_get_aranges(3), dwarf_get_cu_die_offset(3)

April 16, 2011 | NetBSD 11.0