diff options
Diffstat (limited to 'rtemstoolkit/elftoolchain/libdwarf/dwarf_next_cu_header.3')
| -rw-r--r-- | rtemstoolkit/elftoolchain/libdwarf/dwarf_next_cu_header.3 | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/rtemstoolkit/elftoolchain/libdwarf/dwarf_next_cu_header.3 b/rtemstoolkit/elftoolchain/libdwarf/dwarf_next_cu_header.3 new file mode 100644 index 0000000..f68867d --- /dev/null +++ b/rtemstoolkit/elftoolchain/libdwarf/dwarf_next_cu_header.3 @@ -0,0 +1,288 @@ +.\" Copyright (c) 2010,2014 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_next_cu_header.3 3182 2015-04-10 16:08:10Z emaste $ +.\" +.Dd December 21, 2014 +.Os +.Dt DWARF_NEXT_CU_HEADER 3 +.Sh NAME +.Nm dwarf_next_cu_header , +.Nm dwarf_next_cu_header_b , +.Nm dwarf_next_cu_header_c +.Nd step through compilation units in a DWARF debug context +.Sh LIBRARY +.Lb libdwarf +.Sh SYNOPSIS +.In libdwarf.h +.Ft int +.Fo dwarf_next_cu_header +.Fa "Dwarf_Debug dbg" +.Fa "Dwarf_Unsigned *cu_length" +.Fa "Dwarf_Half *cu_version" +.Fa "Dwarf_Off *cu_abbrev_offset" +.Fa "Dwarf_Half *cu_pointer_size" +.Fa "Dwarf_Unsigned *cu_next_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_next_cu_header_b +.Fa "Dwarf_Debug dbg" +.Fa "Dwarf_Unsigned *cu_length" +.Fa "Dwarf_Half *cu_version" +.Fa "Dwarf_Off *cu_abbrev_offset" +.Fa "Dwarf_Half *cu_pointer_size" +.Fa "Dwarf_Half *cu_offset_size" +.Fa "Dwarf_Half *cu_extension_size" +.Fa "Dwarf_Unsigned *cu_next_offset" +.Fa "Dwarf_Error *err" +.Fc +.Ft int +.Fo dwarf_next_cu_header_c +.Fa "Dwarf_Debug dbg" +.Fa "Dwarf_Bool is_info" +.Fa "Dwarf_Unsigned *cu_length" +.Fa "Dwarf_Half *cu_version" +.Fa "Dwarf_Off *cu_abbrev_offset" +.Fa "Dwarf_Half *cu_pointer_size" +.Fa "Dwarf_Half *cu_offset_size" +.Fa "Dwarf_Half *cu_extension_size" +.Fa "Dwarf_Sig8 *type_signature" +.Fa "Dwarf_Unsigned *type_offset" +.Fa "Dwarf_Unsigned *cu_next_offset" +.Fa "Dwarf_Error *err" +.Fc +.Sh DESCRIPTION +These functions are used to step through compilation or type units +associated with a DWARF debug context, optionally returning information +about the unit. +.Pp +Function +.Fn dwarf_next_cu_header_c +is the API recommended for new application code. +Function +.Fn dwarf_next_cu_header +and +.Fn dwarf_next_cu_header_b +can only operate on compilation units associated with the +.Dq \&.debug_info +section. +They are less general than function +.Fn dwarf_next_cu_header_c , +and are deprecated for use by new application code. +.Pp +Argument +.Ar dbg +should reference a DWARF debug context allocated using +.Xr dwarf_init 3 . +If argument +.Ar is_info +is set to 1, +the function returns information for compilation units found in the +.Dq \&.debug_info +section. +If argument +.Ar is_info +is set to 0, +the function returns information for type units found in the +.Dq \&.debug_types +sections. +Argument +.Ar cu_length +should point to a location that will be set to the +length of the compilation or type unit. +Argument +.Ar cu_version +should point to a location that will be set to the +version number for the compilation or type unit. +Argument +.Ar cu_abbrev_offset +should point to a location that will be set to the +starting offset (in the +.Dq .debug_abbrev +section) of the set of debugging information entry abbreviations +associated with this compilation or type unit. +Argument +.Ar cu_pointer_size +should point to a location that will be set to the +size in bytes of an address for the machine architecture of the +underlying object being debugged. +Argument +.Ar cu_offset_size +should point to a location that will be set to the +size in bytes for a DWARF offset in the compilation or type unit. +Argument +.Ar cu_extension_size +is only needed for processing MIPS/IRIX objects that use +a non-standard DWARF format. +It should point to a location that will be set to 4 for normal +objects and to 0 for non-standard ones. +Argument +.Ar type_signature +and +.Ar type_offset +is only needed for processing type units. +Argument +.Ar type_signature +should point to a location that will be set to the 64-bit unique signature +of the type described in the type unit. +Argument +.Ar type_offset +should point to a location that will be set to the offset of the debugging +information entry that describes the type. +Argument +.Ar cu_next_offset +should point to a location that will be set to the +offset of the next compilation unit header in the +.Dq \&.debug_info +section, +or the offset of the next type unit header in the +.Dq \&.debug_types +section. +Argument +.Ar err +should point to a location that will hold an error descriptor in case +of an error. +.Pp +Function +.Fn dwarf_next_cu_header_b +is identical to function +.Fn dwarf_next_cu_header_c +except that it does not provide arguments +.Ar is_info , +.Ar type_signature +and +.Ar type_offset . +.Pp +Function +.Fn dwarf_next_cu_header +is identical to function +.Fn dwarf_next_cu_header_b +except that it does not provide arguments +.Ar cu_offset_size +and +.Ar cu_extension_size . +.Pp +A value of NULL may be used for any of the arguments +.Ar cu_length , +.Ar cu_version , +.Ar cu_abbrev_offset , +.Ar cu_pointer_size , +.Ar cu_offset_size , +.Ar cu_extension_size , +.Ar type_signature , +.Ar type_offset , +.Ar cu_next_offset +and +.Ar err +if the caller is not interested in the respective value. +.Ss Iterating Through Compilation Units in a Debug Context +.Pp +The first call to function +.Fn dwarf_next_cu_header_c +for a given debug context with argument +.Ar is_info +set to 1 will return information about the first +compilation unit in the +.Dq \&.debug_info +section. +Subsequent calls to the function will iterate through the remaining +compilation units in the section. +On stepping past the last compilation unit in the section, +function +.Fn dwarf_next_cu_header_c +returns +.Dv DW_DLV_NO_ENTRY +and resets its internal state. +The next call to the function will restart from the first compilation +unit in the section. +.Ss Iterating Through Type Units in a Debug Context +When a DWARF debug context is allocated using +.Xr dwarf_init 3 , +an internal pointer associated with the context will point to the first +.Dq \&.debug_types +section found in the debug object. +The first call to function +.Fn dwarf_next_cu_header_c +for the debug context with argument +.Ar is_info +set to 0 will return information about the first +type unit in that +.Dq \&.debug_types +section. +Subsequent calls to the function will iterate through the remaining +type units in the section. +On stepping past the last type unit in the debug context, +function +.Fn dwarf_next_cu_header_c +returns +.Dv DW_DLV_NO_ENTRY +and resets its internal state. +The next call to the function will restart from the first type +unit in the +.Dq \&.debug_types +section. +.Pp +If the debug object contains multiple +.Dq \&.debug_types +sections, the function +.Fn dwarf_next_types_section +can be called to move the internal pointer to the next +.Dq \&.debug_types +section. +As a result, subsequent calls of the function +.Fn dwarf_next_cu_header_c +will operate on the new +.Dq \&.debug_types +section. +Function +.Fn dwarf_next_types_section +returns +.Dv DW_DLV_NO_ENTRY +when there are no more +.Dq \&.debug_types +sections left in the debug object. +.Sh RETURN VALUES +On success, these functions return +.Dv DW_DLV_OK . +In case of an error, they return +.Dv DW_DLV_ERROR +and set argument +.Ar err . +When there are no more compilation units left to traverse, they return +.Dv DW_DLV_NO_ENTRY . +.Sh ERRORS +These functions can fail with the following error: +.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT" +.It Bq Er DW_DLE_ARGUMENT +Argument +.Va dbg +was NULL. +.El +.Sh SEE ALSO +.Xr dwarf 3 , +.Xr dwarf_get_cu_die_offset_given_cu_header_offset 3 , +.Xr dwarf_init 3 , +.Xr dwarf_next_types_section 3 , +.Xr dwarf_siblingof 3 |