DWARF_UNDEF_MACRO(3)

💖 DWARF_UNDEF_MACRO(3) 💖

okay so this is the DWARF_UNDEF_MACRO(3) page from the Library Functions Manual, and bestie, it's literally all about recording when a macro definition gets removed. no cap, let's get into it 💅

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🌸 NAME 🌸

dwarf_undef_macro — record the removal of a macro definition

🦋 LIBRARY 🦋

DWARF Access Library (libdwarf, -ldwarf)

✨ SYNOPSIS ✨

#include <libdwarf.h>

int
dwarf_undef_macro(Dwarf_P_Debug dbg, Dwarf_Unsigned lineno, char *name,
    Dwarf_Error *err);

💜 DESCRIPTION 💜

Function dwarf_undef_macro() records the removal of a macro definition in a DWARF producer instance. iconic behavior honestly 🫶

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

Argument lineno specifies the line number of the source line where the macro definition was removed. A value of zero indicates that the macro definition was removed before any source files were read. very "before the story even started" energy ✨

Argument name should point to a NUL-terminated string containing the name of the macro.

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_undef_macro() returns DW_DLV_OK. In case of an error, function dwarf_undef_macro() returns DW_DLV_ERROR and sets the argument err. slay when it works, sad little error path when it doesn't 😭

🌈 EXAMPLES 🌈

To record the fact that the macro named _STDIO_H_ was removed at line 220 of the current macro file, use:

       Dwarf_P_Debug dbg;
       Dwarf_Error de;

       /* ... Assume 'dbg' refers to a DWARF producer instance... */
       if (dwarf_undef_macro(dbg, 220, "_STDIO_H_", &de) != DW_DLV_OK)
               errx(EXIT_FAILURE, "dwarf_def_macro failed: %s",
                   dwarf_errmsg(-1));

🔥 ERRORS 🔥

Function dwarf_undef_macro() can fail with:

• [DW_DLE_ARGUMENT] — Either arguments dbg or name was NULL.
• [DW_DLE_MEMORY] — An out of memory condition was encountered during the execution of the function.

🫶 SEE ALSO 🫶

dwarf(3), dwarf_def_macro(3), dwarf_end_macro_file(3), dwarf_producer_init(3), dwarf_producer_init_b(3), dwarf_start_macro_file(3), dwarf_vendor_ext(3) 👑✨

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xoxo 💋 — Debian, November 9, 2011 🌸