freebsd-dev/contrib/elftoolchain/libdwarf/dwarf_def_macro.3
Ed Maste ae500c1ff8 Update to ELF Tool Chain r3668
Highlights:
- Make sure that only TLS sections are sorted into TLS segment.
- Fixed multiple errors in "Section to Segment mapping".
- Man page updates
- ar improvements
- elfcopy: avoid filter_reloc uninitialized variable for rela
- elfcopy: avoid stripping relocations from static binaries
- readelf: avoid printing directory in front of absolute path
- readelf: add NT_FREEBSD_FEATURE_CTL FreeBSD note type
- test improvements

NOTES:

Some of these changes originated in FreeBSD and simply reduce diffs
between contrib and vendor.

ELF Tool Chain ar is not (currently) used in FreeBSD, and there are
improvements in both FreeBSD and ELF Tool Chain ar that are not in
the other.

Sponsored by:	The FreeBSD Foundation
2019-01-10 14:35:23 +00:00

130 lines
3.6 KiB
Groff

.\" Copyright (c) 2011 Kai Wang
.\" All rights reserved.
.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" $Id: dwarf_def_macro.3 3644 2018-10-15 19:55:01Z jkoshy $
.\"
.Dd November 9, 2011
.Dt DWARF_DEF_MACRO 3
.Os
.Sh NAME
.Nm dwarf_def_macro
.Nd add a macro definition to a DWARF producer instance
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "int"
.Fo dwarf_def_macro
.Fa "Dwarf_P_Debug dbg"
.Fa "Dwarf_Unsigned lineno"
.Fa "char *name"
.Fa "char *value"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_def_macro
adds a macro definition to a DWARF producer instance.
.Pp
Argument
.Ar dbg
should reference a DWARF producer instance allocated using
.Xr dwarf_producer_init 3
or
.Xr dwarf_producer_init_b 3 .
.Pp
Argument
.Ar 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.
.Pp
Argument
.Ar 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.
.Pp
Argument
.Ar value
should point to a NUL-terminated string containing the value
of the macro.
If the macro does not have a value, argument
.Ar value
should be set to NULL.
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case of an
error.
.Sh RETURN VALUES
On success, function
.Fn dwarf_def_macro
returns
.Dv DW_DLV_OK .
In case of an error, function
.Fn dwarf_def_macro
returns
.Dv DW_DLV_ERROR
and sets the argument
.Ar err .
.Sh EXAMPLES
To record the fact that a macro named
.Dv _STDIO_H_
was defined at line 20 of the current macro file, use:
.Bd -literal -offset indent
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));
.Ed
.Sh ERRORS
Function
.Fn dwarf_def_macro
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
Either arguments
.Ar dbg
or
.Ar name
was NULL.
.It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of the
function.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_end_macro_file 3 ,
.Xr dwarf_producer_init 3 ,
.Xr dwarf_producer_init_b 3 ,
.Xr dwarf_start_macro_file 3 ,
.Xr dwarf_undef_macro 3 ,
.Xr dwarf_vendor_ext 3