913460fcde
* python/py-value.c (value_to_value_object): Remove fetching of the value if it was lazy. (valpy_get_is_lazy): New function. (valpy_fetch_lazy): New function.
1422 lines
37 KiB
C
1422 lines
37 KiB
C
/* Python interface to values.
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Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdb_assert.h"
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#include "charset.h"
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#include "value.h"
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#include "exceptions.h"
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#include "language.h"
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#include "dfp.h"
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#include "valprint.h"
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#include "infcall.h"
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#include "expression.h"
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#include "cp-abi.h"
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#ifdef HAVE_PYTHON
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#include "python-internal.h"
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/* Even though Python scalar types directly map to host types, we use
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target types here to remain consistent with the values system in
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GDB (which uses target arithmetic). */
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/* Python's integer type corresponds to C's long type. */
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#define builtin_type_pyint builtin_type (python_gdbarch)->builtin_long
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/* Python's float type corresponds to C's double type. */
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#define builtin_type_pyfloat builtin_type (python_gdbarch)->builtin_double
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/* Python's long type corresponds to C's long long type. */
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#define builtin_type_pylong builtin_type (python_gdbarch)->builtin_long_long
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/* Python's long type corresponds to C's long long type. Unsigned version. */
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#define builtin_type_upylong builtin_type \
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(python_gdbarch)->builtin_unsigned_long_long
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#define builtin_type_pybool \
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language_bool_type (python_language, python_gdbarch)
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#define builtin_type_pychar \
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language_string_char_type (python_language, python_gdbarch)
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typedef struct value_object {
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PyObject_HEAD
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struct value_object *next;
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struct value_object *prev;
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struct value *value;
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PyObject *address;
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PyObject *type;
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PyObject *dynamic_type;
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} value_object;
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/* List of all values which are currently exposed to Python. It is
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maintained so that when an objfile is discarded, preserve_values
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can copy the values' types if needed. */
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/* This variable is unnecessarily initialized to NULL in order to
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work around a linker bug on MacOS. */
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static value_object *values_in_python = NULL;
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/* Called by the Python interpreter when deallocating a value object. */
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static void
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valpy_dealloc (PyObject *obj)
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{
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value_object *self = (value_object *) obj;
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/* Remove SELF from the global list. */
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if (self->prev)
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self->prev->next = self->next;
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else
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{
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gdb_assert (values_in_python == self);
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values_in_python = self->next;
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}
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if (self->next)
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self->next->prev = self->prev;
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value_free (self->value);
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if (self->address)
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/* Use braces to appease gcc warning. *sigh* */
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{
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Py_DECREF (self->address);
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}
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if (self->type)
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{
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Py_DECREF (self->type);
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}
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Py_XDECREF (self->dynamic_type);
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self->ob_type->tp_free (self);
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}
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/* Helper to push a Value object on the global list. */
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static void
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note_value (value_object *value_obj)
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{
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value_obj->next = values_in_python;
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if (value_obj->next)
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value_obj->next->prev = value_obj;
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value_obj->prev = NULL;
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values_in_python = value_obj;
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}
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/* Called when a new gdb.Value object needs to be allocated. Returns NULL on
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error, with a python exception set. */
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static PyObject *
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valpy_new (PyTypeObject *subtype, PyObject *args, PyObject *keywords)
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{
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struct value *value = NULL; /* Initialize to appease gcc warning. */
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value_object *value_obj;
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if (PyTuple_Size (args) != 1)
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{
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PyErr_SetString (PyExc_TypeError, _("Value object creation takes only "
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"1 argument"));
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return NULL;
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}
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value_obj = (value_object *) subtype->tp_alloc (subtype, 1);
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if (value_obj == NULL)
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{
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PyErr_SetString (PyExc_MemoryError, _("Could not allocate memory to "
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"create Value object."));
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return NULL;
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}
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value = convert_value_from_python (PyTuple_GetItem (args, 0));
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if (value == NULL)
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{
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subtype->tp_free (value_obj);
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return NULL;
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}
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value_obj->value = value;
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value_incref (value);
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value_obj->address = NULL;
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value_obj->type = NULL;
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value_obj->dynamic_type = NULL;
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note_value (value_obj);
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return (PyObject *) value_obj;
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}
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/* Iterate over all the Value objects, calling preserve_one_value on
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each. */
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void
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preserve_python_values (struct objfile *objfile, htab_t copied_types)
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{
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value_object *iter;
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for (iter = values_in_python; iter; iter = iter->next)
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preserve_one_value (iter->value, objfile, copied_types);
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}
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/* Given a value of a pointer type, apply the C unary * operator to it. */
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static PyObject *
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valpy_dereference (PyObject *self, PyObject *args)
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{
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struct value *res_val = NULL; /* Initialize to appease gcc warning. */
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volatile struct gdb_exception except;
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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res_val = value_ind (((value_object *) self)->value);
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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return value_to_value_object (res_val);
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}
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/* Return "&value". */
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static PyObject *
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valpy_get_address (PyObject *self, void *closure)
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{
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struct value *res_val = NULL; /* Initialize to appease gcc warning. */
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value_object *val_obj = (value_object *) self;
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volatile struct gdb_exception except;
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if (!val_obj->address)
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{
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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res_val = value_addr (val_obj->value);
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}
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if (except.reason < 0)
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{
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val_obj->address = Py_None;
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Py_INCREF (Py_None);
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}
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else
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val_obj->address = value_to_value_object (res_val);
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}
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Py_XINCREF (val_obj->address);
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return val_obj->address;
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}
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/* Return type of the value. */
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static PyObject *
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valpy_get_type (PyObject *self, void *closure)
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{
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value_object *obj = (value_object *) self;
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if (!obj->type)
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{
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obj->type = type_to_type_object (value_type (obj->value));
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if (!obj->type)
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return NULL;
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}
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Py_INCREF (obj->type);
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return obj->type;
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}
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/* Return dynamic type of the value. */
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static PyObject *
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valpy_get_dynamic_type (PyObject *self, void *closure)
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{
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value_object *obj = (value_object *) self;
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volatile struct gdb_exception except;
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struct type *type = NULL;
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if (obj->dynamic_type != NULL)
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{
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Py_INCREF (obj->dynamic_type);
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return obj->dynamic_type;
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}
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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struct value *val = obj->value;
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type = value_type (val);
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CHECK_TYPEDEF (type);
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if (((TYPE_CODE (type) == TYPE_CODE_PTR)
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|| (TYPE_CODE (type) == TYPE_CODE_REF))
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&& (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
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{
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struct value *target;
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int was_pointer = TYPE_CODE (type) == TYPE_CODE_PTR;
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target = value_ind (val);
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type = value_rtti_type (target, NULL, NULL, NULL);
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if (type)
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{
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if (was_pointer)
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type = lookup_pointer_type (type);
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else
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type = lookup_reference_type (type);
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}
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}
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else if (TYPE_CODE (type) == TYPE_CODE_CLASS)
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type = value_rtti_type (val, NULL, NULL, NULL);
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else
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{
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/* Re-use object's static type. */
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type = NULL;
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}
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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if (type == NULL)
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{
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/* Ensure that the TYPE field is ready. */
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if (!valpy_get_type (self, NULL))
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return NULL;
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/* We don't need to incref here, because valpy_get_type already
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did it for us. */
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obj->dynamic_type = obj->type;
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}
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else
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obj->dynamic_type = type_to_type_object (type);
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Py_INCREF (obj->dynamic_type);
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return obj->dynamic_type;
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}
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/* Implementation of gdb.Value.lazy_string ([encoding] [, length]) ->
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string. Return a PyObject representing a lazy_string_object type.
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A lazy string is a pointer to a string with an optional encoding and
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length. If ENCODING is not given, encoding is set to None. If an
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ENCODING is provided the encoding parameter is set to ENCODING, but
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the string is not encoded. If LENGTH is provided then the length
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parameter is set to LENGTH, otherwise length will be set to -1 (first
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null of appropriate with). */
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static PyObject *
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valpy_lazy_string (PyObject *self, PyObject *args, PyObject *kw)
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{
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gdb_py_longest length = -1;
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struct value *value = ((value_object *) self)->value;
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const char *user_encoding = NULL;
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static char *keywords[] = { "encoding", "length", NULL };
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PyObject *str_obj;
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volatile struct gdb_exception except;
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if (!PyArg_ParseTupleAndKeywords (args, kw, "|s" GDB_PY_LL_ARG, keywords,
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&user_encoding, &length))
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return NULL;
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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if (TYPE_CODE (value_type (value)) == TYPE_CODE_PTR)
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value = value_ind (value);
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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str_obj = gdbpy_create_lazy_string_object (value_address (value), length,
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user_encoding,
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value_type (value));
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return (PyObject *) str_obj;
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}
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/* Implementation of gdb.Value.string ([encoding] [, errors]
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[, length]) -> string. Return Unicode string with value contents.
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If ENCODING is not given, the string is assumed to be encoded in
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the target's charset. If LENGTH is provided, only fetch string to
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the length provided. */
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static PyObject *
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valpy_string (PyObject *self, PyObject *args, PyObject *kw)
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{
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int length = -1;
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gdb_byte *buffer;
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struct value *value = ((value_object *) self)->value;
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volatile struct gdb_exception except;
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PyObject *unicode;
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const char *encoding = NULL;
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const char *errors = NULL;
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const char *user_encoding = NULL;
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const char *la_encoding = NULL;
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struct type *char_type;
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static char *keywords[] = { "encoding", "errors", "length", NULL };
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if (!PyArg_ParseTupleAndKeywords (args, kw, "|ssi", keywords,
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&user_encoding, &errors, &length))
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return NULL;
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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LA_GET_STRING (value, &buffer, &length, &char_type, &la_encoding);
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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encoding = (user_encoding && *user_encoding) ? user_encoding : la_encoding;
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unicode = PyUnicode_Decode (buffer, length * TYPE_LENGTH (char_type),
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encoding, errors);
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xfree (buffer);
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return unicode;
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}
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/* A helper function that implements the various cast operators. */
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static PyObject *
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valpy_do_cast (PyObject *self, PyObject *args, enum exp_opcode op)
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{
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PyObject *type_obj;
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struct type *type;
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struct value *res_val = NULL; /* Initialize to appease gcc warning. */
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volatile struct gdb_exception except;
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if (! PyArg_ParseTuple (args, "O", &type_obj))
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return NULL;
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type = type_object_to_type (type_obj);
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if (! type)
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{
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PyErr_SetString (PyExc_RuntimeError,
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_("Argument must be a type."));
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return NULL;
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}
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TRY_CATCH (except, RETURN_MASK_ALL)
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{
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struct value *val = ((value_object *) self)->value;
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if (op == UNOP_DYNAMIC_CAST)
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res_val = value_dynamic_cast (type, val);
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else if (op == UNOP_REINTERPRET_CAST)
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res_val = value_reinterpret_cast (type, val);
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else
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{
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gdb_assert (op == UNOP_CAST);
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res_val = value_cast (type, val);
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}
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}
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GDB_PY_HANDLE_EXCEPTION (except);
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return value_to_value_object (res_val);
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}
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/* Implementation of the "cast" method. */
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static PyObject *
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valpy_cast (PyObject *self, PyObject *args)
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{
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return valpy_do_cast (self, args, UNOP_CAST);
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}
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|
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/* Implementation of the "dynamic_cast" method. */
|
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|
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static PyObject *
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valpy_dynamic_cast (PyObject *self, PyObject *args)
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{
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return valpy_do_cast (self, args, UNOP_DYNAMIC_CAST);
|
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}
|
||
|
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/* Implementation of the "reinterpret_cast" method. */
|
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|
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static PyObject *
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valpy_reinterpret_cast (PyObject *self, PyObject *args)
|
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{
|
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return valpy_do_cast (self, args, UNOP_REINTERPRET_CAST);
|
||
}
|
||
|
||
static Py_ssize_t
|
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valpy_length (PyObject *self)
|
||
{
|
||
/* We don't support getting the number of elements in a struct / class. */
|
||
PyErr_SetString (PyExc_NotImplementedError,
|
||
_("Invalid operation on gdb.Value."));
|
||
return -1;
|
||
}
|
||
|
||
/* Given string name of an element inside structure, return its value
|
||
object. Returns NULL on error, with a python exception set. */
|
||
static PyObject *
|
||
valpy_getitem (PyObject *self, PyObject *key)
|
||
{
|
||
value_object *self_value = (value_object *) self;
|
||
char *field = NULL;
|
||
struct value *res_val = NULL;
|
||
volatile struct gdb_exception except;
|
||
|
||
if (gdbpy_is_string (key))
|
||
{
|
||
field = python_string_to_host_string (key);
|
||
if (field == NULL)
|
||
return NULL;
|
||
}
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
struct value *tmp = self_value->value;
|
||
|
||
if (field)
|
||
res_val = value_struct_elt (&tmp, NULL, field, 0, NULL);
|
||
else
|
||
{
|
||
/* Assume we are attempting an array access, and let the
|
||
value code throw an exception if the index has an invalid
|
||
type. */
|
||
struct value *idx = convert_value_from_python (key);
|
||
|
||
if (idx != NULL)
|
||
{
|
||
/* Check the value's type is something that can be accessed via
|
||
a subscript. */
|
||
struct type *type;
|
||
|
||
tmp = coerce_ref (tmp);
|
||
type = check_typedef (value_type (tmp));
|
||
if (TYPE_CODE (type) != TYPE_CODE_ARRAY
|
||
&& TYPE_CODE (type) != TYPE_CODE_PTR)
|
||
error (_("Cannot subscript requested type."));
|
||
else
|
||
res_val = value_subscript (tmp, value_as_long (idx));
|
||
}
|
||
}
|
||
}
|
||
|
||
xfree (field);
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return res_val ? value_to_value_object (res_val) : NULL;
|
||
}
|
||
|
||
static int
|
||
valpy_setitem (PyObject *self, PyObject *key, PyObject *value)
|
||
{
|
||
PyErr_Format (PyExc_NotImplementedError,
|
||
_("Setting of struct elements is not currently supported."));
|
||
return -1;
|
||
}
|
||
|
||
/* Called by the Python interpreter to perform an inferior function
|
||
call on the value. Returns NULL on error, with a python exception set. */
|
||
static PyObject *
|
||
valpy_call (PyObject *self, PyObject *args, PyObject *keywords)
|
||
{
|
||
struct value *return_value = NULL;
|
||
Py_ssize_t args_count;
|
||
volatile struct gdb_exception except;
|
||
struct value *function = ((value_object *) self)->value;
|
||
struct value **vargs = NULL;
|
||
struct type *ftype = NULL;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
ftype = check_typedef (value_type (function));
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
if (TYPE_CODE (ftype) != TYPE_CODE_FUNC)
|
||
{
|
||
PyErr_SetString (PyExc_RuntimeError,
|
||
_("Value is not callable (not TYPE_CODE_FUNC)."));
|
||
return NULL;
|
||
}
|
||
|
||
if (! PyTuple_Check (args))
|
||
{
|
||
PyErr_SetString (PyExc_TypeError,
|
||
_("Inferior arguments must be provided in a tuple."));
|
||
return NULL;
|
||
}
|
||
|
||
args_count = PyTuple_Size (args);
|
||
if (args_count > 0)
|
||
{
|
||
int i;
|
||
|
||
vargs = alloca (sizeof (struct value *) * args_count);
|
||
for (i = 0; i < args_count; i++)
|
||
{
|
||
PyObject *item = PyTuple_GetItem (args, i);
|
||
|
||
if (item == NULL)
|
||
return NULL;
|
||
|
||
vargs[i] = convert_value_from_python (item);
|
||
if (vargs[i] == NULL)
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
return_value = call_function_by_hand (function, args_count, vargs);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return value_to_value_object (return_value);
|
||
}
|
||
|
||
/* Called by the Python interpreter to obtain string representation
|
||
of the object. */
|
||
static PyObject *
|
||
valpy_str (PyObject *self)
|
||
{
|
||
char *s = NULL;
|
||
PyObject *result;
|
||
struct value_print_options opts;
|
||
volatile struct gdb_exception except;
|
||
|
||
get_user_print_options (&opts);
|
||
opts.deref_ref = 0;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
struct ui_file *stb = mem_fileopen ();
|
||
struct cleanup *old_chain = make_cleanup_ui_file_delete (stb);
|
||
|
||
common_val_print (((value_object *) self)->value, stb, 0,
|
||
&opts, python_language);
|
||
s = ui_file_xstrdup (stb, NULL);
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
result = PyUnicode_Decode (s, strlen (s), host_charset (), NULL);
|
||
xfree (s);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Implements gdb.Value.is_optimized_out. */
|
||
static PyObject *
|
||
valpy_get_is_optimized_out (PyObject *self, void *closure)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
int opt = 0;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
opt = value_optimized_out (value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
if (opt)
|
||
Py_RETURN_TRUE;
|
||
|
||
Py_RETURN_FALSE;
|
||
}
|
||
|
||
/* Implements gdb.Value.is_lazy. */
|
||
static PyObject *
|
||
valpy_get_is_lazy (PyObject *self, void *closure)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
int opt = 0;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
opt = value_lazy (value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
if (opt)
|
||
Py_RETURN_TRUE;
|
||
|
||
Py_RETURN_FALSE;
|
||
}
|
||
|
||
/* Implements gdb.Value.fetch_lazy (). */
|
||
static PyObject *
|
||
valpy_fetch_lazy (PyObject *self, PyObject *args)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
if (value_lazy (value))
|
||
value_fetch_lazy (value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
Py_RETURN_NONE;
|
||
}
|
||
|
||
/* Calculate and return the address of the PyObject as the value of
|
||
the builtin __hash__ call. */
|
||
static long
|
||
valpy_hash (PyObject *self)
|
||
{
|
||
return (long) (intptr_t) self;
|
||
}
|
||
|
||
enum valpy_opcode
|
||
{
|
||
VALPY_ADD,
|
||
VALPY_SUB,
|
||
VALPY_MUL,
|
||
VALPY_DIV,
|
||
VALPY_REM,
|
||
VALPY_POW,
|
||
VALPY_LSH,
|
||
VALPY_RSH,
|
||
VALPY_BITAND,
|
||
VALPY_BITOR,
|
||
VALPY_BITXOR
|
||
};
|
||
|
||
/* If TYPE is a reference, return the target; otherwise return TYPE. */
|
||
#define STRIP_REFERENCE(TYPE) \
|
||
((TYPE_CODE (TYPE) == TYPE_CODE_REF) ? (TYPE_TARGET_TYPE (TYPE)) : (TYPE))
|
||
|
||
/* Returns a value object which is the result of applying the operation
|
||
specified by OPCODE to the given arguments. Returns NULL on error, with
|
||
a python exception set. */
|
||
static PyObject *
|
||
valpy_binop (enum valpy_opcode opcode, PyObject *self, PyObject *other)
|
||
{
|
||
struct value *res_val = NULL; /* Initialize to appease gcc warning. */
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
struct value *arg1, *arg2;
|
||
|
||
/* If the gdb.Value object is the second operand, then it will be passed
|
||
to us as the OTHER argument, and SELF will be an entirely different
|
||
kind of object, altogether. Because of this, we can't assume self is
|
||
a gdb.Value object and need to convert it from python as well. */
|
||
arg1 = convert_value_from_python (self);
|
||
if (arg1 == NULL)
|
||
break;
|
||
|
||
arg2 = convert_value_from_python (other);
|
||
if (arg2 == NULL)
|
||
break;
|
||
|
||
switch (opcode)
|
||
{
|
||
case VALPY_ADD:
|
||
{
|
||
struct type *ltype = value_type (arg1);
|
||
struct type *rtype = value_type (arg2);
|
||
|
||
CHECK_TYPEDEF (ltype);
|
||
ltype = STRIP_REFERENCE (ltype);
|
||
CHECK_TYPEDEF (rtype);
|
||
rtype = STRIP_REFERENCE (rtype);
|
||
|
||
if (TYPE_CODE (ltype) == TYPE_CODE_PTR
|
||
&& is_integral_type (rtype))
|
||
res_val = value_ptradd (arg1, value_as_long (arg2));
|
||
else if (TYPE_CODE (rtype) == TYPE_CODE_PTR
|
||
&& is_integral_type (ltype))
|
||
res_val = value_ptradd (arg2, value_as_long (arg1));
|
||
else
|
||
res_val = value_binop (arg1, arg2, BINOP_ADD);
|
||
}
|
||
break;
|
||
case VALPY_SUB:
|
||
{
|
||
struct type *ltype = value_type (arg1);
|
||
struct type *rtype = value_type (arg2);
|
||
|
||
CHECK_TYPEDEF (ltype);
|
||
ltype = STRIP_REFERENCE (ltype);
|
||
CHECK_TYPEDEF (rtype);
|
||
rtype = STRIP_REFERENCE (rtype);
|
||
|
||
if (TYPE_CODE (ltype) == TYPE_CODE_PTR
|
||
&& TYPE_CODE (rtype) == TYPE_CODE_PTR)
|
||
/* A ptrdiff_t for the target would be preferable here. */
|
||
res_val = value_from_longest (builtin_type_pyint,
|
||
value_ptrdiff (arg1, arg2));
|
||
else if (TYPE_CODE (ltype) == TYPE_CODE_PTR
|
||
&& is_integral_type (rtype))
|
||
res_val = value_ptradd (arg1, - value_as_long (arg2));
|
||
else
|
||
res_val = value_binop (arg1, arg2, BINOP_SUB);
|
||
}
|
||
break;
|
||
case VALPY_MUL:
|
||
res_val = value_binop (arg1, arg2, BINOP_MUL);
|
||
break;
|
||
case VALPY_DIV:
|
||
res_val = value_binop (arg1, arg2, BINOP_DIV);
|
||
break;
|
||
case VALPY_REM:
|
||
res_val = value_binop (arg1, arg2, BINOP_REM);
|
||
break;
|
||
case VALPY_POW:
|
||
res_val = value_binop (arg1, arg2, BINOP_EXP);
|
||
break;
|
||
case VALPY_LSH:
|
||
res_val = value_binop (arg1, arg2, BINOP_LSH);
|
||
break;
|
||
case VALPY_RSH:
|
||
res_val = value_binop (arg1, arg2, BINOP_RSH);
|
||
break;
|
||
case VALPY_BITAND:
|
||
res_val = value_binop (arg1, arg2, BINOP_BITWISE_AND);
|
||
break;
|
||
case VALPY_BITOR:
|
||
res_val = value_binop (arg1, arg2, BINOP_BITWISE_IOR);
|
||
break;
|
||
case VALPY_BITXOR:
|
||
res_val = value_binop (arg1, arg2, BINOP_BITWISE_XOR);
|
||
break;
|
||
}
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return res_val ? value_to_value_object (res_val) : NULL;
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_add (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_ADD, self, other);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_subtract (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_SUB, self, other);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_multiply (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_MUL, self, other);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_divide (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_DIV, self, other);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_remainder (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_REM, self, other);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_power (PyObject *self, PyObject *other, PyObject *unused)
|
||
{
|
||
/* We don't support the ternary form of pow. I don't know how to express
|
||
that, so let's just throw NotImplementedError to at least do something
|
||
about it. */
|
||
if (unused != Py_None)
|
||
{
|
||
PyErr_SetString (PyExc_NotImplementedError,
|
||
"Invalid operation on gdb.Value.");
|
||
return NULL;
|
||
}
|
||
|
||
return valpy_binop (VALPY_POW, self, other);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_negative (PyObject *self)
|
||
{
|
||
struct value *val = NULL;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
val = value_neg (((value_object *) self)->value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return value_to_value_object (val);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_positive (PyObject *self)
|
||
{
|
||
return value_to_value_object (((value_object *) self)->value);
|
||
}
|
||
|
||
static PyObject *
|
||
valpy_absolute (PyObject *self)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
volatile struct gdb_exception except;
|
||
int isabs = 1;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
if (value_less (value, value_zero (value_type (value), not_lval)))
|
||
isabs = 0;
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
if (isabs)
|
||
return valpy_positive (self);
|
||
else
|
||
return valpy_negative (self);
|
||
}
|
||
|
||
/* Implements boolean evaluation of gdb.Value. */
|
||
static int
|
||
valpy_nonzero (PyObject *self)
|
||
{
|
||
volatile struct gdb_exception except;
|
||
value_object *self_value = (value_object *) self;
|
||
struct type *type;
|
||
int nonzero = 0; /* Appease GCC warning. */
|
||
|
||
type = check_typedef (value_type (self_value->value));
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
if (is_integral_type (type) || TYPE_CODE (type) == TYPE_CODE_PTR)
|
||
nonzero = !!value_as_long (self_value->value);
|
||
else if (TYPE_CODE (type) == TYPE_CODE_FLT)
|
||
nonzero = value_as_double (self_value->value) != 0;
|
||
else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
|
||
nonzero = !decimal_is_zero (value_contents (self_value->value),
|
||
TYPE_LENGTH (type),
|
||
gdbarch_byte_order (get_type_arch (type)));
|
||
else
|
||
/* All other values are True. */
|
||
nonzero = 1;
|
||
}
|
||
/* This is not documented in the Python documentation, but if this
|
||
function fails, return -1 as slot_nb_nonzero does (the default
|
||
Python nonzero function). */
|
||
GDB_PY_SET_HANDLE_EXCEPTION (except);
|
||
|
||
return nonzero;
|
||
}
|
||
|
||
/* Implements ~ for value objects. */
|
||
static PyObject *
|
||
valpy_invert (PyObject *self)
|
||
{
|
||
struct value *val = NULL;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
val = value_complement (((value_object *) self)->value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return value_to_value_object (val);
|
||
}
|
||
|
||
/* Implements left shift for value objects. */
|
||
static PyObject *
|
||
valpy_lsh (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_LSH, self, other);
|
||
}
|
||
|
||
/* Implements right shift for value objects. */
|
||
static PyObject *
|
||
valpy_rsh (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_RSH, self, other);
|
||
}
|
||
|
||
/* Implements bitwise and for value objects. */
|
||
static PyObject *
|
||
valpy_and (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_BITAND, self, other);
|
||
}
|
||
|
||
/* Implements bitwise or for value objects. */
|
||
static PyObject *
|
||
valpy_or (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_BITOR, self, other);
|
||
}
|
||
|
||
/* Implements bitwise xor for value objects. */
|
||
static PyObject *
|
||
valpy_xor (PyObject *self, PyObject *other)
|
||
{
|
||
return valpy_binop (VALPY_BITXOR, self, other);
|
||
}
|
||
|
||
/* Implements comparison operations for value objects. Returns NULL on error,
|
||
with a python exception set. */
|
||
static PyObject *
|
||
valpy_richcompare (PyObject *self, PyObject *other, int op)
|
||
{
|
||
int result = 0;
|
||
struct value *value_other;
|
||
volatile struct gdb_exception except;
|
||
|
||
if (other == Py_None)
|
||
/* Comparing with None is special. From what I can tell, in Python
|
||
None is smaller than anything else. */
|
||
switch (op) {
|
||
case Py_LT:
|
||
case Py_LE:
|
||
case Py_EQ:
|
||
Py_RETURN_FALSE;
|
||
case Py_NE:
|
||
case Py_GT:
|
||
case Py_GE:
|
||
Py_RETURN_TRUE;
|
||
default:
|
||
/* Can't happen. */
|
||
PyErr_SetString (PyExc_NotImplementedError,
|
||
_("Invalid operation on gdb.Value."));
|
||
return NULL;
|
||
}
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
value_other = convert_value_from_python (other);
|
||
if (value_other == NULL)
|
||
{
|
||
result = -1;
|
||
break;
|
||
}
|
||
|
||
switch (op) {
|
||
case Py_LT:
|
||
result = value_less (((value_object *) self)->value, value_other);
|
||
break;
|
||
case Py_LE:
|
||
result = value_less (((value_object *) self)->value, value_other)
|
||
|| value_equal (((value_object *) self)->value, value_other);
|
||
break;
|
||
case Py_EQ:
|
||
result = value_equal (((value_object *) self)->value, value_other);
|
||
break;
|
||
case Py_NE:
|
||
result = !value_equal (((value_object *) self)->value, value_other);
|
||
break;
|
||
case Py_GT:
|
||
result = value_less (value_other, ((value_object *) self)->value);
|
||
break;
|
||
case Py_GE:
|
||
result = value_less (value_other, ((value_object *) self)->value)
|
||
|| value_equal (((value_object *) self)->value, value_other);
|
||
break;
|
||
default:
|
||
/* Can't happen. */
|
||
PyErr_SetString (PyExc_NotImplementedError,
|
||
_("Invalid operation on gdb.Value."));
|
||
result = -1;
|
||
break;
|
||
}
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
/* In this case, the Python exception has already been set. */
|
||
if (result < 0)
|
||
return NULL;
|
||
|
||
if (result == 1)
|
||
Py_RETURN_TRUE;
|
||
|
||
Py_RETURN_FALSE;
|
||
}
|
||
|
||
/* Helper function to determine if a type is "int-like". */
|
||
static int
|
||
is_intlike (struct type *type, int ptr_ok)
|
||
{
|
||
return (TYPE_CODE (type) == TYPE_CODE_INT
|
||
|| TYPE_CODE (type) == TYPE_CODE_ENUM
|
||
|| TYPE_CODE (type) == TYPE_CODE_BOOL
|
||
|| TYPE_CODE (type) == TYPE_CODE_CHAR
|
||
|| (ptr_ok && TYPE_CODE (type) == TYPE_CODE_PTR));
|
||
}
|
||
|
||
/* Implements conversion to int. */
|
||
static PyObject *
|
||
valpy_int (PyObject *self)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
struct type *type = value_type (value);
|
||
LONGEST l = 0;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
CHECK_TYPEDEF (type);
|
||
if (!is_intlike (type, 0))
|
||
error (_("Cannot convert value to int."));
|
||
|
||
l = value_as_long (value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return gdb_py_object_from_longest (l);
|
||
}
|
||
|
||
/* Implements conversion to long. */
|
||
static PyObject *
|
||
valpy_long (PyObject *self)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
struct type *type = value_type (value);
|
||
LONGEST l = 0;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
CHECK_TYPEDEF (type);
|
||
|
||
if (!is_intlike (type, 1))
|
||
error (_("Cannot convert value to long."));
|
||
|
||
l = value_as_long (value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return gdb_py_long_from_longest (l);
|
||
}
|
||
|
||
/* Implements conversion to float. */
|
||
static PyObject *
|
||
valpy_float (PyObject *self)
|
||
{
|
||
struct value *value = ((value_object *) self)->value;
|
||
struct type *type = value_type (value);
|
||
double d = 0;
|
||
volatile struct gdb_exception except;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
CHECK_TYPEDEF (type);
|
||
|
||
if (TYPE_CODE (type) != TYPE_CODE_FLT)
|
||
error (_("Cannot convert value to float."));
|
||
|
||
d = value_as_double (value);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return PyFloat_FromDouble (d);
|
||
}
|
||
|
||
/* Returns an object for a value which is released from the all_values chain,
|
||
so its lifetime is not bound to the execution of a command. */
|
||
PyObject *
|
||
value_to_value_object (struct value *val)
|
||
{
|
||
value_object *val_obj;
|
||
|
||
val_obj = PyObject_New (value_object, &value_object_type);
|
||
if (val_obj != NULL)
|
||
{
|
||
val_obj->value = val;
|
||
value_incref (val);
|
||
val_obj->address = NULL;
|
||
val_obj->type = NULL;
|
||
val_obj->dynamic_type = NULL;
|
||
note_value (val_obj);
|
||
}
|
||
|
||
return (PyObject *) val_obj;
|
||
}
|
||
|
||
/* Returns a borrowed reference to the struct value corresponding to
|
||
the given value object. */
|
||
struct value *
|
||
value_object_to_value (PyObject *self)
|
||
{
|
||
value_object *real;
|
||
|
||
if (! PyObject_TypeCheck (self, &value_object_type))
|
||
return NULL;
|
||
real = (value_object *) self;
|
||
return real->value;
|
||
}
|
||
|
||
/* Try to convert a Python value to a gdb value. If the value cannot
|
||
be converted, set a Python exception and return NULL. Returns a
|
||
reference to a new value on the all_values chain. */
|
||
|
||
struct value *
|
||
convert_value_from_python (PyObject *obj)
|
||
{
|
||
struct value *value = NULL; /* -Wall */
|
||
struct cleanup *old;
|
||
volatile struct gdb_exception except;
|
||
int cmp;
|
||
|
||
gdb_assert (obj != NULL);
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
if (PyBool_Check (obj))
|
||
{
|
||
cmp = PyObject_IsTrue (obj);
|
||
if (cmp >= 0)
|
||
value = value_from_longest (builtin_type_pybool, cmp);
|
||
}
|
||
else if (PyInt_Check (obj))
|
||
{
|
||
long l = PyInt_AsLong (obj);
|
||
|
||
if (! PyErr_Occurred ())
|
||
value = value_from_longest (builtin_type_pyint, l);
|
||
}
|
||
else if (PyLong_Check (obj))
|
||
{
|
||
LONGEST l = PyLong_AsLongLong (obj);
|
||
|
||
if (PyErr_Occurred ())
|
||
{
|
||
/* If the error was an overflow, we can try converting to
|
||
ULONGEST instead. */
|
||
if (PyErr_ExceptionMatches (PyExc_OverflowError))
|
||
{
|
||
PyObject *etype, *evalue, *etraceback, *zero;
|
||
|
||
PyErr_Fetch (&etype, &evalue, &etraceback);
|
||
zero = PyInt_FromLong (0);
|
||
|
||
/* Check whether obj is positive. */
|
||
if (PyObject_RichCompareBool (obj, zero, Py_GT) > 0)
|
||
{
|
||
ULONGEST ul;
|
||
|
||
ul = PyLong_AsUnsignedLongLong (obj);
|
||
if (! PyErr_Occurred ())
|
||
value = value_from_ulongest (builtin_type_upylong, ul);
|
||
}
|
||
else
|
||
/* There's nothing we can do. */
|
||
PyErr_Restore (etype, evalue, etraceback);
|
||
|
||
Py_DECREF (zero);
|
||
}
|
||
}
|
||
else
|
||
value = value_from_longest (builtin_type_pylong, l);
|
||
}
|
||
else if (PyFloat_Check (obj))
|
||
{
|
||
double d = PyFloat_AsDouble (obj);
|
||
|
||
if (! PyErr_Occurred ())
|
||
value = value_from_double (builtin_type_pyfloat, d);
|
||
}
|
||
else if (gdbpy_is_string (obj))
|
||
{
|
||
char *s;
|
||
|
||
s = python_string_to_target_string (obj);
|
||
if (s != NULL)
|
||
{
|
||
old = make_cleanup (xfree, s);
|
||
value = value_cstring (s, strlen (s), builtin_type_pychar);
|
||
do_cleanups (old);
|
||
}
|
||
}
|
||
else if (PyObject_TypeCheck (obj, &value_object_type))
|
||
value = value_copy (((value_object *) obj)->value);
|
||
else if (gdbpy_is_lazy_string (obj))
|
||
{
|
||
PyObject *result;
|
||
|
||
result = PyObject_CallMethodObjArgs (obj, gdbpy_value_cst, NULL);
|
||
value = value_copy (((value_object *) result)->value);
|
||
}
|
||
else
|
||
PyErr_Format (PyExc_TypeError,
|
||
_("Could not convert Python object: %s."),
|
||
PyString_AsString (PyObject_Str (obj)));
|
||
}
|
||
if (except.reason < 0)
|
||
{
|
||
PyErr_Format (except.reason == RETURN_QUIT
|
||
? PyExc_KeyboardInterrupt : PyExc_RuntimeError,
|
||
"%s", except.message);
|
||
return NULL;
|
||
}
|
||
|
||
return value;
|
||
}
|
||
|
||
/* Returns value object in the ARGth position in GDB's history. */
|
||
PyObject *
|
||
gdbpy_history (PyObject *self, PyObject *args)
|
||
{
|
||
int i;
|
||
struct value *res_val = NULL; /* Initialize to appease gcc warning. */
|
||
volatile struct gdb_exception except;
|
||
|
||
if (!PyArg_ParseTuple (args, "i", &i))
|
||
return NULL;
|
||
|
||
TRY_CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
res_val = access_value_history (i);
|
||
}
|
||
GDB_PY_HANDLE_EXCEPTION (except);
|
||
|
||
return value_to_value_object (res_val);
|
||
}
|
||
|
||
/* Returns 1 in OBJ is a gdb.Value object, 0 otherwise. */
|
||
|
||
int
|
||
gdbpy_is_value_object (PyObject *obj)
|
||
{
|
||
return PyObject_TypeCheck (obj, &value_object_type);
|
||
}
|
||
|
||
void
|
||
gdbpy_initialize_values (void)
|
||
{
|
||
if (PyType_Ready (&value_object_type) < 0)
|
||
return;
|
||
|
||
Py_INCREF (&value_object_type);
|
||
PyModule_AddObject (gdb_module, "Value", (PyObject *) &value_object_type);
|
||
|
||
values_in_python = NULL;
|
||
}
|
||
|
||
|
||
|
||
static PyGetSetDef value_object_getset[] = {
|
||
{ "address", valpy_get_address, NULL, "The address of the value.",
|
||
NULL },
|
||
{ "is_optimized_out", valpy_get_is_optimized_out, NULL,
|
||
"Boolean telling whether the value is optimized "
|
||
"out (i.e., not available).",
|
||
NULL },
|
||
{ "type", valpy_get_type, NULL, "Type of the value.", NULL },
|
||
{ "dynamic_type", valpy_get_dynamic_type, NULL,
|
||
"Dynamic type of the value.", NULL },
|
||
{ "is_lazy", valpy_get_is_lazy, NULL,
|
||
"Boolean telling whether the value is lazy (not fetched yet\n\
|
||
from the inferior). A lazy value is fetched when needed, or when\n\
|
||
the \"fetch_lazy()\" method is called.", NULL },
|
||
{NULL} /* Sentinel */
|
||
};
|
||
|
||
static PyMethodDef value_object_methods[] = {
|
||
{ "cast", valpy_cast, METH_VARARGS, "Cast the value to the supplied type." },
|
||
{ "dynamic_cast", valpy_dynamic_cast, METH_VARARGS,
|
||
"dynamic_cast (gdb.Type) -> gdb.Value\n\
|
||
Cast the value to the supplied type, as if by the C++ dynamic_cast operator."
|
||
},
|
||
{ "reinterpret_cast", valpy_reinterpret_cast, METH_VARARGS,
|
||
"reinterpret_cast (gdb.Type) -> gdb.Value\n\
|
||
Cast the value to the supplied type, as if by the C++\n\
|
||
reinterpret_cast operator."
|
||
},
|
||
{ "dereference", valpy_dereference, METH_NOARGS, "Dereferences the value." },
|
||
{ "lazy_string", (PyCFunction) valpy_lazy_string,
|
||
METH_VARARGS | METH_KEYWORDS,
|
||
"lazy_string ([encoding] [, length]) -> lazy_string\n\
|
||
Return a lazy string representation of the value." },
|
||
{ "string", (PyCFunction) valpy_string, METH_VARARGS | METH_KEYWORDS,
|
||
"string ([encoding] [, errors] [, length]) -> string\n\
|
||
Return Unicode string representation of the value." },
|
||
{ "fetch_lazy", valpy_fetch_lazy, METH_NOARGS,
|
||
"Fetches the value from the inferior, if it was lazy." },
|
||
{NULL} /* Sentinel */
|
||
};
|
||
|
||
static PyNumberMethods value_object_as_number = {
|
||
valpy_add,
|
||
valpy_subtract,
|
||
valpy_multiply,
|
||
valpy_divide,
|
||
valpy_remainder,
|
||
NULL, /* nb_divmod */
|
||
valpy_power, /* nb_power */
|
||
valpy_negative, /* nb_negative */
|
||
valpy_positive, /* nb_positive */
|
||
valpy_absolute, /* nb_absolute */
|
||
valpy_nonzero, /* nb_nonzero */
|
||
valpy_invert, /* nb_invert */
|
||
valpy_lsh, /* nb_lshift */
|
||
valpy_rsh, /* nb_rshift */
|
||
valpy_and, /* nb_and */
|
||
valpy_xor, /* nb_xor */
|
||
valpy_or, /* nb_or */
|
||
NULL, /* nb_coerce */
|
||
valpy_int, /* nb_int */
|
||
valpy_long, /* nb_long */
|
||
valpy_float, /* nb_float */
|
||
NULL, /* nb_oct */
|
||
NULL /* nb_hex */
|
||
};
|
||
|
||
static PyMappingMethods value_object_as_mapping = {
|
||
valpy_length,
|
||
valpy_getitem,
|
||
valpy_setitem
|
||
};
|
||
|
||
PyTypeObject value_object_type = {
|
||
PyObject_HEAD_INIT (NULL)
|
||
0, /*ob_size*/
|
||
"gdb.Value", /*tp_name*/
|
||
sizeof (value_object), /*tp_basicsize*/
|
||
0, /*tp_itemsize*/
|
||
valpy_dealloc, /*tp_dealloc*/
|
||
0, /*tp_print*/
|
||
0, /*tp_getattr*/
|
||
0, /*tp_setattr*/
|
||
0, /*tp_compare*/
|
||
0, /*tp_repr*/
|
||
&value_object_as_number, /*tp_as_number*/
|
||
0, /*tp_as_sequence*/
|
||
&value_object_as_mapping, /*tp_as_mapping*/
|
||
valpy_hash, /*tp_hash*/
|
||
valpy_call, /*tp_call*/
|
||
valpy_str, /*tp_str*/
|
||
0, /*tp_getattro*/
|
||
0, /*tp_setattro*/
|
||
0, /*tp_as_buffer*/
|
||
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES
|
||
| Py_TPFLAGS_BASETYPE, /*tp_flags*/
|
||
"GDB value object", /* tp_doc */
|
||
0, /* tp_traverse */
|
||
0, /* tp_clear */
|
||
valpy_richcompare, /* tp_richcompare */
|
||
0, /* tp_weaklistoffset */
|
||
0, /* tp_iter */
|
||
0, /* tp_iternext */
|
||
value_object_methods, /* tp_methods */
|
||
0, /* tp_members */
|
||
value_object_getset, /* tp_getset */
|
||
0, /* tp_base */
|
||
0, /* tp_dict */
|
||
0, /* tp_descr_get */
|
||
0, /* tp_descr_set */
|
||
0, /* tp_dictoffset */
|
||
0, /* tp_init */
|
||
0, /* tp_alloc */
|
||
valpy_new /* tp_new */
|
||
};
|
||
|
||
#else
|
||
|
||
void
|
||
preserve_python_values (struct objfile *objfile, htab_t copied_types)
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
|
||
#endif /* HAVE_PYTHON */
|