DWARF_NEW_DIE(3)

💅 DWARF_NEW_DIE(3) — allocate a new debugging information entry

Okay bestie, welcome to DWARF_NEW_DIE(3) from the Library Functions Manual. This one is serving DWARF producer realness ✨

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💖 NAME

dwarf_new_die — allocate a new debugging information entry

🎀 LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

✨ SYNOPSIS

#include <libdwarf.h>

Dwarf_P_Die
dwarf_new_die(Dwarf_P_Debug dbg, Dwarf_Tag tag, Dwarf_P_Die parent,
    Dwarf_P_Die child, Dwarf_P_Die left, Dwarf_P_Die right,
    Dwarf_Error *err);

🦋 DESCRIPTION

So dwarf_new_die() allocates a fresh DWARF debugging information entry and links it to another debugging information entry. It’s giving “new node just dropped” energy 🔥

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

The tag argument should specify the tag of the newly created debugging information entry. Valid values for this argument are those for the DW_TAG_* symbols defined in <libdwarf.h>.

The parent argument specifies the parent link of the debugging information entry.

The child argument specifies the first child link of the debugging information entry.

The left argument specifies the left sibling link of the debugging information entry.

The right argument specifies the right sibling link of the debugging information entry.

Only one of the arguments parent, child, left and right is allowed to be non-NULL. That’s the rule, bestie — pick one link, not a whole situationship 💅

Application code can subsequently call the function dwarf_die_link(3) to change the links for the created debugging information entry.

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

🌈 RETURN VALUES

On success, function dwarf_new_die() returns the newly created debugging information entry. In case of an error, function dwarf_new_die() returns DW_DLV_BADADDR and sets the argument err.

🍓 EXAMPLES

To create debugging information entries and add them to the producer instance, use:

      Dwarf_P_Debug dbg;
      Dwarf_P_Die die1, die2;
      Dwarf_Error de;

      /* ... assume dbg refers to a DWARF producer instance ... */

      die1 = dwarf_new_die(dbg, DW_TAG_compilation_unit, NULL, NULL, NULL,
          NULL, &de);
      if (die1 == NULL) {
              warnx("dwarf_new_die failed: %s", dwarf_errmsg(-1));
              return;
      }

      die2 = dwarf_new_die(dbg, DW_TAG_base_type, die1, NULL, NULL,
          NULL, &de);
      if (die1 == NULL) {
              warnx("dwarf_new_die failed: %s", dwarf_errmsg(-1));
              return;
      }

      if (dwarf_add_die_to_debug(dbg, die1, &de) != DW_DLV_OK) {
              warnx("dwarf_add_die_to_debug failed: %s", dwarf_errmsg(-1));
              return;
      }

💀 ERRORS

Function dwarf_new_die() can fail with:

• [DW_DLE_ARGUMENT] — Argument dbg was NULL.
• [DW_DLE_ARGUMENT] — More than one of the arguments parent, child, left and right were non-NULL.
• [DW_DLE_MEMORY] — An out of memory condition was encountered during the execution of the function.

👑 SEE ALSO

dwarf(3), dwarf_add_die_to_debug(3), dwarf_die_link(3), dwarf_producer_init(3), dwarf_producer_init_b(3)

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Signing off with the footer tea: Debian, September 4, 2011. Periodt 💖✨