219 lines
6.0 KiB
Groff
219 lines
6.0 KiB
Groff
.\" 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_get_fde_list.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_GET_FDE_LIST 3
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.Sh NAME
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.Nm dwarf_get_fde_list
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.Nd retrieve frame information
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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_get_fde_list
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Cie **cie_list"
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.Fa "Dwarf_Signed *cie_count"
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.Fa "Dwarf_Fde **fde_list"
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.Fa "Dwarf_Signed *fde_count"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft int
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.Fo dwarf_get_fde_list_eh
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Cie **cie_list"
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.Fa "Dwarf_Signed *cie_count"
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.Fa "Dwarf_Fde **fde_list"
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.Fa "Dwarf_Signed *fde_count"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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These functions retrieve frame related information for the specified
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DWARF debug context.
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.Pp
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Function
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.Fn dwarf_get_fde_list
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retrieves frame information from the DWARF section named
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.Dq ".debug_frame" .
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For objects containing GNU style C++ exception handling
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information, the function
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.Fn dwarf_get_fde_list_eh
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retrieves frame information from the section named
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.Dq ".eh_frame" .
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.Pp
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Frame information is returned using opaque descriptors
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of type
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.Vt Dwarf_Cie
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and
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.Vt Dwarf_Fde .
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Applications need to use the other frame related functions in the
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DWARF(3) API set to retrieve the information contained in these
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descriptors.
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF debug context allocated using
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.Xr dwarf_init 3 .
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.Pp
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Argument
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.Ar cie_list
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should point to a location that will be set to a pointer to an array
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of
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.Vt Dwarf_Cie
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descriptors.
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.Pp
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Argument
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.Ar cie_count
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should point to a location that will be set to the number of
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.Vt Dwarf_Cie
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descriptors returned.
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.Pp
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Argument
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.Ar fde_list
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should point to a location that will be set to a pointer to an array
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of
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.Vt Dwarf_Fde
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descriptors.
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.Pp
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Argument
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.Ar fde_count
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should point to a location that will be set to the number of
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.Vt Dwarf_Fde
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descriptors returned.
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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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.Ss Memory Management
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The memory areas used for the arrays returned in arguments
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.Ar cie_list
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and
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.Ar fde_list
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are owned by the
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.Lb libdwarf .
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Application code should not attempt to directly free these areas.
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Portable applications should instead use the
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.Xr dwarf_fde_cie_list_dealloc 3
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function to indicate that these memory areas may be freed.
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.Sh RETURN VALUES
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On success, these functions returns
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.Dv DW_DLV_OK .
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They return
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.Dv DW_DLV_NO_ENTRY
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if there is no frame information associated with the given DWARF
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debug context.
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In case of an error, they return
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.Dv DW_DLV_ERROR
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and set the argument
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.Ar err .
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.Sh ERRORS
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These functions may fail with the following errors:
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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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One of the arguments
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.Va dbg ,
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.Va cie_list ,
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.Va cie_count ,
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.Va fde_list
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or
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.Va fde_count
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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There is no frame information associated with the giving DWARF debug
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context.
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.El
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.Sh EXAMPLE
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To obtain frame information from the
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.Dq ".debug_frame"
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section, use:
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.Bd -literal -offset indent
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Dwarf_Debug dbg;
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Dwarf_Cie *cie_list, cie;
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Dwarf_Fde *fde_list, fde;
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Dwarf_Off fde_offset, cie_offset;
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Dwarf_Unsigned func_len, fde_length, fde_instlen;
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Dwarf_Signed cie_count, fde_count, cie_index;
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Dwarf_Addr low_pc;
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Dwarf_Ptr fde_addr, fde_inst, cie_inst;
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Dwarf_Error de;
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int i;
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if (dwarf_get_fde_list(dbg, &cie_list, &cie_count,
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&fde_list, &fde_count, &de) != DW_DLV_OK) {
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errx(EXIT_FAILURE, "dwarf_get_fde_list failed: %s",
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dwarf_errmsg(de));
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}
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for (i = 0; i < fde_count; i++) {
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if (dwarf_get_fde_n(fde_list, i, &fde, &de) != DW_DLV_OK) {
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warnx("dwarf_get_fde_n failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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if (dwarf_get_cie_of_fde(fde, &cie, &de) != DW_DLV_OK) {
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warnx("dwarf_get_fde_n failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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if (dwarf_get_fde_range(fde, &low_pc, &func_len, &fde_addr,
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&fde_length, &cie_offset, &cie_index, &fde_offset,
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&de) != DW_DLV_OK) {
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warnx("dwarf_get_fde_range failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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if (dwarf_get_fde_instr_bytes(fde, &fde_inst, &fde_instlen,
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&de) != DW_DLV_OK) {
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warnx("dwarf_get_fde_instr_bytes failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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/* ... Use the retrieved frame information ... */
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}
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/* Indicate that the returned arrays may be freed. */
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dwarf_fde_cie_list_dealloc(dbg, cie_list, cie_count, fde_list,
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fde_count);
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.Ed
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.Sh SEE ALSO
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.Xr dwarf 3 ,
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.Xr dwarf_get_cie_index 3 ,
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.Xr dwarf_get_cie_of_fde 3 ,
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.Xr dwarf_get_fde_at_pc 3 ,
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.Xr dwarf_get_fde_instr_bytes 3 ,
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.Xr dwarf_get_fde_n 3 ,
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.Xr dwarf_get_fde_range 3 ,
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.Xr dwarf_fde_cie_list_dealloc 3 ,
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.Xr dwarf_set_frame_cfa_value 3 ,
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.Xr dwarf_set_frame_rule_table_size 3 ,
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.Xr dwarf_set_frame_rule_initial_value 3 ,
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.Xr dwarf_set_frame_same_value 3 ,
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.Xr dwarf_set_frame_undefined_value 3
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