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FreeBSD 11.0 - man page for dwarf_var_cu_offset (freebsd section 3)

DWARF_GET_VARS(3)					   BSD Library Functions Manual 					 DWARF_GET_VARS(3)

NAME
dwarf_get_vars, dwarf_var_cu_offset, dwarf_var_die_offset, dwarf_var_name_offsets, dwarf_varname -- retrieve information about static vari- ables
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h> int dwarf_get_vars(Dwarf_Debug dbg, Dwarf_Var **vars, Dwarf_Signed *nvars, Dwarf_Error *err); int dwarf_var_cu_offset(Dwarf_Var var, Dwarf_Off *cu_offset, Dwarf_Error *err); int dwarf_var_die_offset(Dwarf_Var var, Dwarf_Off *die_offset, Dwarf_Error *err); int dwarf_var_name_offsets(Dwarf_Var var, char **name, Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err); int dwarf_varname(Dwarf_Var var, char **name, Dwarf_Error *err);
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 Dwarf_Var. Applications need to use the functions described below to retrieve the name and offset information contained in these descriptors. Function dwarf_get_vars() retrieves descriptors for all the static variables associated with the DWARF debug context specified by argument dbg. The argument vars should point to a location that will be set to a pointer to an array of Dwarf_Var descriptors. The argument nvars should point to a location that will be set to the number of descriptors returned. Function dwarf_var_cu_offset() returns the section-relative offset, relative to the ``.debug_info'' section, of the compilation unit that contains the debugging information entry associated with the argument var. Argument cu_offset should point to a location that will hold the returned offset. Function dwarf_var_die_offset() retrieves the section-relative offset, relative to the ``.debug_info'' section, of the debugging information entry associated with the argument var, and stores it into the location pointed to by the argument die_offset. Function dwarf_var_name_offsets() retrieves both the name and the associated offsets for the debugging information entry for argument var. Argument 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 die_offset should point to a location which will be set to a section-relative offset, relative to the ``.debug_info'' section, of the associated debugging information entry. Argument cu_die_offset should point to a location which will be set to a section-relative offset, relative to the ``.debug_info'' section, of the first debugging information entry in the compilation unit asso- ciated with argument var. Function dwarf_varname() sets the location pointed to by argument name to a pointer to a NUL-terminated string holding the name of the debug- ging information entry associated with the argument var. Memory Management The memory area used for the array of Dwarf_Var descriptors returned in argument vars by function dwarf_get_vars() is owned by the DWARF Access Library (libdwarf, -ldwarf). Application code should not attempt to directly free this pointer. Portable code should instead use the function dwarf_vars_dealloc(3) to indicate that the memory area may be freed. The memory area used for the string returned in the name argument to functions dwarf_var_name_offsets() and dwarf_varname() is owned by the DWARF Access Library (libdwarf, -ldwarf). Portable code should indicate that the memory area can be freed using the dwarf_dealloc(3) func- tion. Error Returns If argument err is not NULL, these functions will use it to store error information, in case of an error.
RETURN VALUES
On success, these functions returns DW_DLV_OK. In case of an error, they return DW_DLV_ERROR and set the argument err.
ERRORS
These functions may fail with the following errors: [DW_DLE_ARGUMENT] One of the arguments cu_die_offset, cu_offset, dbg, die_offset, var, vars, name, or nvars was NULL.
SEE ALSO
dwarf(3), dwarf_dealloc(3), dwarf_get_cu_die_offset_given_cu_header_offset(3), dwarf_vars_dealloc(3)
BSD
April 2, 2011 BSD