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2012-03-14 Siva Chandra <sivachandra@google.com>

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Python scripting: Add new method Value.referenced_value to
        gdb.Value which can dereference pointer as well as reference
        values.
        * NEWS: Add entry under 'Python scripting' about the new method
        Value.referenced_value on gdb.Value objects.
        * python/py-value.c (valpy_referenced_value): New function
        defining a new method on gdb.Value objects which can dereference
        pointer and reference values.
        * testsuite/gdb.python/py-value.cc: Add test case for
        testing the methodology exposing C++ values to Python.
        * testsuite/gdb.python/py-value-cc.exp: Add tests testing the
        methodology exposing C++ values to Python.
        * testsuite/gdb.python/Makefile.in: Add py-value-cc to
        EXECUTABLES.
        * docs/gdb.texinfo (Python API/Values From Inferior): Add
        description about the new method Value.referenced_value.  Add
        description on how Value.dereference is different (and similar)
        to Value.referenced_value.
This commit is contained in:
Siva Chandra Reddy 2012-03-22 08:10:44 +00:00
parent 0c83539f7e
commit 7b282c5acc
9 changed files with 233 additions and 1 deletions
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43
gdb/python/py-value.c
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@ -192,6 +192,47 @@ valpy_dereference (PyObject *self, PyObject *args)
return result;
}
/* Given a value of a pointer type or a reference type, return the value
referenced. The difference between this function and valpy_dereference is
that the latter applies * unary operator to a value, which need not always
result in the value referenced. For example, for a value which is a reference
to an 'int' pointer ('int *'), valpy_dereference will result in a value of
type 'int' while valpy_referenced_value will result in a value of type
'int *'. */
static PyObject *
valpy_referenced_value (PyObject *self, PyObject *args)
{
volatile struct gdb_exception except;
PyObject *result = NULL;
TRY_CATCH (except, RETURN_MASK_ALL)
{
struct value *self_val, *res_val;
struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
self_val = ((value_object *) self)->value;
switch (TYPE_CODE (check_typedef (value_type (self_val))))
{
case TYPE_CODE_PTR:
res_val = value_ind (self_val);
break;
case TYPE_CODE_REF:
res_val = coerce_ref (self_val);
break;
default:
error(_("Trying to get the referenced value from a value which is "
"neither a pointer nor a reference."));
}
result = value_to_value_object (res_val);
do_cleanups (cleanup);
}
GDB_PY_HANDLE_EXCEPTION (except);
return result;
}
/* Return "&value". */
static PyObject *
valpy_get_address (PyObject *self, void *closure)
@ -1379,6 +1420,8 @@ Cast the value to the supplied type, as if by the C++\n\
reinterpret_cast operator."
},
{ "dereference", valpy_dereference, METH_NOARGS, "Dereferences the value." },
{ "referenced_value", valpy_referenced_value, METH_NOARGS,
"Return the value referenced by a TYPE_CODE_REF or TYPE_CODE_PTR value." },
{ "lazy_string", (PyCFunction) valpy_lazy_string,
METH_VARARGS | METH_KEYWORDS,
"lazy_string ([encoding] [, length]) -> lazy_string\n\