NAME

dwarf_def_macro — add a macro definition to a DWARF producer instance

LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

#include <libdwarf.h>

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

DESCRIPTION

Function dwarf_def_macro() adds a macro definition to 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 is defined. A line number of zero is used for macros that are defined before any source file is read.

Argument name should point to a NUL-terminated string containing the name of the macro. For function-like macros this parameter should also include parentheses and parameter names if any.

Argument value should point to a NUL-terminated string containing the value of the macro. If the macro doesn't have a value, argument value should be set to NULL.

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_def_macro() returns DW_DLV_OK. In case of an error, function dwarf_def_macro() returns DW_DLV_ERROR and sets the argument err.

EXAMPLE

To record the fact that a macro named _STDIO_H_ was defined at line 20 of the current macro file, use:

Dwarf_P_Debug dbg; 
Dwarf_Error de; 
 
/* ... Assume 'dbg' refers to a DWARF producer instance... */ 
if (dwarf_def_macro(dbg, 20, "_STDIO_H_", NULL, &de) != DW_DLV_OK) 
	errx(EXIT_FAILURE, "dwarf_def_macro failed: %s", 
	    dwarf_errmsg(-1));

ERRORS

Function dwarf_def_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_end_macro_file(3), dwarf_producer_init(3), dwarf_producer_init_b(3), dwarf_start_macro_file(3), dwarf_undef_macro(3), dwarf_vendor_ext(3)