DWARF_ADD_AT_TARG_ADDRESS_B(3)

💅 DWARF_ADD_AT_TARG_ADDRESS(3) — the manual page, bestie edition

okay so you're in the Library Functions Manual for DWARF_ADD_AT_TARG_ADDRESS(3) and honestly? you're about to learn how to make address-class attributes and it's gonna slay ✨

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🎀 NAME 🎀

dwarf_add_AT_targ_address, dwarf_add_AT_targ_address_b — create and attach address class attributes 💖

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🌸 LIBRARY 🌸

DWARF Access Library (libdwarf, -ldwarf)

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🦋 SYNOPSIS 🦋

#include <libdwarf.h>

Dwarf_P_Attribute
dwarf_add_AT_targ_address(Dwarf_P_Debug dbg, Dwarf_P_Die die,
    Dwarf_Half attr, Dwarf_Unsigned pc_value, Dwarf_Signed sym_index,
    Dwarf_Error *err);

Dwarf_P_Attribute
dwarf_add_AT_targ_address_b(Dwarf_P_Debug dbg, Dwarf_P_Die die,
    Dwarf_Half attr, Dwarf_Unsigned pc_value, Dwarf_Unsigned sym_index,
    Dwarf_Error *err);

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✨ DESCRIPTION ✨

so dwarf_add_AT_targ_address_b() is the main character here: it creates an attribute descriptor that belongs to the ‘address’ class and attaches it to the debugging information entry that argument die points at. it's giving "I make attributes and I make them address-class" 💅

the created attribute descriptor will have DWARF form DW_FORM_addr. and here's the tea: if flag DW_DLC_SIZE_64 is set on the producer instance, the attribute value will be 8 bytes in size. otherwise? the attribute value will be 4 bytes in size. no cap, that's just how it is ✨

• argument dbg — should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3). like, that's the vibe it needs to have already 🫶
• argument die — should reference a debugging information entry allocated using dwarf_new_die(3) 💖
• argument attr — should specify the attribute code of the created attribute descriptor 🌸
• argument pc_value — should hold a relocatable address value which will become the value of the created attribute descriptor 🦋
• argument sym_index — should specify the ELF symbol index of the symbol to be used for relocating the address value 👑
• argument err — if it's not NULL, it will be used to store error information in case of an error. like a little error-holding bag 🎀

🚨 important bestie moment: function dwarf_add_AT_targ_address() is deprecated. it's similar to dwarf_add_AT_targ_address_b() except that it cannot handle all possible symbol index values. so like… use the _b one, she ate 💀

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🔥 RETURN VALUES 🔥

on success, these functions return the created attribute descriptor 🎉 in case of an error, these functions return DW_DLV_BADADDR and sets the argument err. yeah, the bad-address one, you know the one 😭

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💀 ERRORS 💀

these functions can fail with:

• [DW_DLE_ARGUMENT] — either of the arguments dbg or die was NULL. like bestie, those gotta be actual things, not nothing 🙈
• [DW_DLE_MEMORY] — an out of memory condition was encountered during execution. ran out of RAM mid-slaying, tragic 🍓

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🌈 SEE ALSO 🌈

dwarf(3), dwarf_add_AT_const_value_unsignedint(3), dwarf_add_AT_dataref(3), dwarf_add_AT_ref_address(3), dwarf_add_AT_signed_const(3), dwarf_add_AT_unsigned_const(3), dwarf_new_die(3), dwarf_producer_init(3), dwarf_producer_init_b(3)

go read the whole friend group, they're all iconic ⭐

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and that's the page!! this one's brought to you by Debian, dated September 4, 2011, and it lives under the handle DWARF_ADD_AT_TARG_ADDRESS(3) — mwah, go build some address attributes bestie 💜🧚