120 lines
3.4 KiB
Groff
120 lines
3.4 KiB
Groff
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.\" Copyright (c) 2011 Kai Wang
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: dwarf_undef_macro.3 2122 2011-11-09 15:35:14Z jkoshy $
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.\"
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.Dd November 9, 2011
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.Os
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.Dt DWARF_UNDEF_MACRO 3
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.Sh NAME
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.Nm dwarf_undef_macro
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.Nd record the removal of a macro definition
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.Sh LIBRARY
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.Lb libdwarf
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.Sh SYNOPSIS
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.In libdwarf.h
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.Ft "int"
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.Fo dwarf_undef_macro
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.Fa "Dwarf_P_Debug dbg"
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.Fa "Dwarf_Unsigned lineno"
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.Fa "char *name"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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Function
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.Fn dwarf_undef_macro
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records the removal of a macro definition in a DWARF producer
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instance.
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF producer instance allocated using
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.Xr dwarf_producer_init 3
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or
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.Xr dwarf_producer_init_b 3 .
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.Pp
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Argument
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.Ar lineno
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specifies the line number of the source line where the macro
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definition was removed.
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A value of zero indicates that the macro definition was removed before
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any source files were read.
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.Pp
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Argument
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.Ar name
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should point to a NUL-terminated string containing the name
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of the macro.
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.Pp
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If argument
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.Ar err
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is not NULL, it will be used to store error information in case of an
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error.
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.Sh RETURN VALUES
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On success, function
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.Fn dwarf_undef_macro
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returns
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.Dv DW_DLV_OK .
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In case of an error, function
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.Fn dwarf_undef_macro
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returns
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.Dv DW_DLV_ERROR
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and sets the argument
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.Ar err .
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.Sh EXAMPLE
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To record the fact that the macro named
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.Dv _STDIO_H_
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was removed at line 220 of the current macro file, use:
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.Bd -literal -offset indent
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Dwarf_P_Debug dbg;
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Dwarf_Error de;
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/* ... Assume 'dbg' refers to a DWARF producer instance... */
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if (dwarf_undef_macro(dbg, 220, "_STDIO_H_", &de) != DW_DLV_OK)
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errx(EXIT_FAILURE, "dwarf_def_macro failed: %s",
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dwarf_errmsg(-1));
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_undef_macro
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can fail with:
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.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
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.It Bq Er DW_DLE_ARGUMENT
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Either arguments
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.Ar dbg
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or
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.Ar name
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was NULL.
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.It Bq Er DW_DLE_MEMORY
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An out of memory condition was encountered during the execution of the
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function.
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.El
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.Sh SEE ALSO
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.Xr dwarf 3 ,
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.Xr dwarf_def_macro 3 ,
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.Xr dwarf_end_macro_file 3 ,
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.Xr dwarf_producer_init 3 ,
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.Xr dwarf_producer_init_b 3 ,
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.Xr dwarf_start_macro_file 3 ,
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.Xr dwarf_vendor_ext 3
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