freebsd-dev/contrib/elftoolchain/libdwarf/dwarf_formudata.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

123 lines
3.3 KiB
Groff

.\" Copyright (c) 2010 Joseph Koshy
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.\" $Id: dwarf_formudata.3 3640 2018-10-14 14:09:13Z jkoshy $
.\"
.Dd June 21, 2010
.Dt DWARF_FORMUDATA 3
.Os
.Sh NAME
.Nm dwarf_formudata ,
.Nm dwarf_formsdata
.Nd return the value of a CONSTANT class attribute
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_formudata
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Unsigned *ret"
.Fa "Dwarf_Error *err"
.Fc
.Ft int
.Fo dwarf_formsdata
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Signed *ret"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
These functions return the value associated with a DWARF attribute
describing a constant.
.Pp
Function
.Fn dwarf_formudata
sets the location pointed to by argument
.Ar ret
to the value of the attribute referenced by argument
.Ar attr ,
treating the value as an unsigned quantity.
Argument
.Ar attr
must have one of the following forms:
.Dv DW_FORM_data1 ,
.Dv DW_FORM_data2 ,
.Dv DW_FORM_data4 ,
.Dv DW_FORM_data8
and
.Dv DW_FORM_udata .
.Pp
Function
.Fn dwarf_formsdata
sets the location pointed to by argument
.Ar ret
to the value of the attribute referenced by argument
.Ar attr ,
appropriately sign extended.
Argument
.Ar attr
must have one of the following forms:
.Dv DW_FORM_data1 ,
.Dv DW_FORM_data2 ,
.Dv DW_FORM_data4 ,
.Dv DW_FORM_data8
and
.Dv DW_FORM_sdata .
.Pp
If argument
.Ar err
is not NULL, it will be used to return an error descriptor in case
of an error.
.Sh RETURN VALUES
These functions return
.Dv DW_DLV_OK
on success.
In case of an error, they return
.Dv DW_DLV_ERROR
and set argument
.Ar err .
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD"
.It Bq Er DW_DLE_ARGUMENT
Either of arguments
.Ar attr
or
.Ar ret
was NULL.
.It Bq Er DW_DLE_ATTR_FORM_BAD
The attribute referenced by argument
.Ar attr
was not of a permitted kind.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_attr 3 ,
.Xr dwarf_formblock 3 ,
.Xr dwarf_formflag 3 ,
.Xr dwarf_formref 3 ,
.Xr dwarf_formsig8 3 ,
.Xr dwarf_formstring 3 ,
.Xr dwarf_hasattr 3