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DWARF_UNDEF_MACRO(3) FreeBSD Library Functions Manual DWARF_UNDEF_MACRO(3)
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.
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.
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.
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),