DWARF_NEW_DIE(3)

DWARF_NEW_DIE(3) | Library Functions Manual | DWARF_NEW_DIE(3)

# 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

Function `dwarf_new_die`() allocates a new DWARF debugging information entry and links it to another debugging information entry.

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

Argument tag 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>`.

Argument parent specifies the parent link of the debugging information entry.

Argument child specifies the first child link of the debugging information entry.

Argument left specifies the left sibling link of the debugging information entry.

Argument right specifies the right sibling link of the debugging information entry.

Only one of arguments parent, child, left and right is allowed to be non-NULL. Application code can subsequently call the function dwarf_die_link(3) to change the links for the created debugging information entry.

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_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.

# 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.

# 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;
    }

# SEE ALSO

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

September 4, 2011 | NetBSD 9.0