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Diffstat (limited to 'rtemstoolkit/elftoolchain/libdwarf/dwarf_get_vars.3')
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diff --git a/rtemstoolkit/elftoolchain/libdwarf/dwarf_get_vars.3 b/rtemstoolkit/elftoolchain/libdwarf/dwarf_get_vars.3 new file mode 100644 index 0000000..d2c3ebd --- /dev/null +++ b/rtemstoolkit/elftoolchain/libdwarf/dwarf_get_vars.3 @@ -0,0 +1,210 @@ +.\" Copyright (c) 2011 Kai Wang +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $Id: dwarf_get_vars.3 2071 2011-10-27 03:20:00Z jkoshy $ +.\" +.Dd April 2, 2011 +.Os +.Dt DWARF_GET_VARS 3 +.Sh NAME +.Nm dwarf_get_vars , +.Nm dwarf_var_cu_offset , +.Nm dwarf_var_die_offset , +.Nm dwarf_var_name_offsets , +.Nm dwarf_varname +.Nd retrieve information about static variables +.Sh LIBRARY +.Lb libdwarf +.Sh SYNOPSIS +.In libdwarf.h +.Ft int +.Fo dwarf_get_vars +.Fa "Dwarf_Debug dbg" +.Fa "Dwarf_Var **vars" +.Fa "Dwarf_Signed *nvars" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_var_cu_offset +.Fa "Dwarf_Var var" +.Fa "Dwarf_Off *cu_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_var_die_offset +.Fa "Dwarf_Var var" +.Fa "Dwarf_Off *die_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_var_name_offsets +.Fa "Dwarf_Var var" +.Fa "char **name" +.Fa "Dwarf_Off *die_offset" +.Fa "Dwarf_Off *cu_die_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_varname +.Fa "Dwarf_Var var" +.Fa "char **name" +.Fa "Dwarf_Error *err" +.Fc +.Sh DESCRIPTION +These functions retrieve information about the file scope static +variables associated with a DWARF debug context. +Information about these static variables is returned using opaque +descriptors of type +.Vt Dwarf_Var . +Applications need to use the functions described below to retrieve +the name and offset information contained in these descriptors. +.Pp +Function +.Fn dwarf_get_vars +retrieves descriptors for all the static variables associated with the +DWARF debug context specified by argument +.Ar dbg . +The argument +.Ar vars +should point to a location that will be set to a pointer to an array +of +.Vt Dwarf_Var +descriptors. +The argument +.Ar nvars +should point to a location that will be set to the number of +descriptors returned. +.Pp +Function +.Fn dwarf_var_cu_offset +returns the section-relative offset, relative to the +.Dq ".debug_info" +section, of the compilation unit that +contains the debugging information entry associated with the argument +.Ar var . +Argument +.Ar cu_offset +should point to a location that will hold the returned offset. +.Pp +Function +.Fn dwarf_var_die_offset +retrieves the section-relative offset, relative to the +.Dq ".debug_info" +section, of the debugging information +entry associated with the argument +.Ar var , +and stores it into the location pointed to by the argument +.Ar die_offset . +.Pp +Function +.Fn dwarf_var_name_offsets +retrieves both the name and the associated offsets for the debugging +information entry for argument +.Ar var . +Argument +.Ar name +should point to a location which will be set to a pointer to a +NUL-terminated string containing the name of the associated debugging +information entry. +Argument +.Ar die_offset +should point to a location which will be set to a section-relative +offset, relative to the +.Dq ".debug_info" +section, of the associated debugging information entry. +Argument +.Ar cu_die_offset +should point to a location which will be set to a +section-relative offset, relative to the +.Dq ".debug_info" +section, of the first debugging information entry in +the compilation unit associated with argument +.Ar var . +.Pp +Function +.Fn dwarf_varname +sets the location pointed to by argument +.Ar name +to a pointer to a NUL-terminated string holding the name of the +debugging information entry associated with the argument +.Ar var . +.Ss Memory Management +The memory area used for the array of +.Vt Dwarf_Var +descriptors returned in argument +.Ar vars +by function +.Fn dwarf_get_vars +is owned by the +.Lb libdwarf . +Application code should not attempt to directly free this pointer. +Portable code should instead use the function +.Xr dwarf_vars_dealloc 3 +to indicate that the memory area may be freed. +.Pp +The memory area used for the string returned in the +.Ar name +argument to functions +.Fn dwarf_var_name_offsets +and +.Fn dwarf_varname +is owned by the +.Lb libdwarf . +Portable code should indicate that the memory area can +be freed using the +.Xr dwarf_dealloc 3 +function. +.Ss Error Returns +If argument +.Ar err +is not NULL, these functions will use it to store error information, +in case of an error. +.Sh RETURN VALUES +On success, these functions returns +.Dv DW_DLV_OK . +In case of an error, they return +.Dv DW_DLV_ERROR +and set the argument +.Ar err . +.Sh ERRORS +These functions may fail with the following errors: +.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" +.It Bq Er DW_DLE_ARGUMENT +One of the arguments +.Va cu_die_offset , +.Va cu_offset , +.Va dbg , +.Va die_offset , +.Va var , +.Va vars , +.Va name , +or +.Va nvars +was NULL. +.El +.Sh SEE ALSO +.Xr dwarf 3 , +.Xr dwarf_dealloc 3 , +.Xr dwarf_get_cu_die_offset_given_cu_header_offset 3 , +.Xr dwarf_vars_dealloc 3 |