dwarf_get_vars,
dwarf_var_cu_offset,
dwarf_var_die_offset,
dwarf_var_name_offsets,
dwarf_varname —
retrieve information about static variables
DWARF Access Library (libdwarf, -ldwarf)
#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);
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 associated 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 debugging information entry
associated with the argument
var.
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)
function.
If argument
err is not NULL, these functions
will use it to store error information, in case of an error.
On success, these functions returns
DW_DLV_OK
. In case of an error, they return
DW_DLV_ERROR
and set the argument
err.
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.
dwarf(3),
dwarf_dealloc(3),
dwarf_get_cu_die_offset_given_cu_header_offset(3),
dwarf_vars_dealloc(3)