dwarf_undef_macro —
record the removal of a macro definition
DWARF Access Library (libdwarf, -ldwarf)
#include
<libdwarf.h>
int
dwarf_undef_macro(
Dwarf_P_Debug
dbg,
Dwarf_Unsigned lineno,
char *name,
Dwarf_Error *err);
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.
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.
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));
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.
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)