1 /* Python interface to values.
3 Copyright (C) 2008-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "expression.h"
31 #include "python-internal.h"
33 /* Even though Python scalar types directly map to host types, we use
34 target types here to remain consistent with the values system in
35 GDB (which uses target arithmetic). */
37 /* Python's integer type corresponds to C's long type. */
38 #define builtin_type_pyint builtin_type (python_gdbarch)->builtin_long
40 /* Python's float type corresponds to C's double type. */
41 #define builtin_type_pyfloat builtin_type (python_gdbarch)->builtin_double
43 /* Python's long type corresponds to C's long long type. */
44 #define builtin_type_pylong builtin_type (python_gdbarch)->builtin_long_long
46 /* Python's long type corresponds to C's long long type. Unsigned version. */
47 #define builtin_type_upylong builtin_type \
48 (python_gdbarch)->builtin_unsigned_long_long
50 #define builtin_type_pybool \
51 language_bool_type (python_language, python_gdbarch)
53 #define builtin_type_pychar \
54 language_string_char_type (python_language, python_gdbarch)
56 typedef struct value_object {
58 struct value_object *next;
59 struct value_object *prev;
63 PyObject *dynamic_type;
66 /* List of all values which are currently exposed to Python. It is
67 maintained so that when an objfile is discarded, preserve_values
68 can copy the values' types if needed. */
69 /* This variable is unnecessarily initialized to NULL in order to
70 work around a linker bug on MacOS. */
71 static value_object *values_in_python = NULL;
73 /* Called by the Python interpreter when deallocating a value object. */
75 valpy_dealloc (PyObject *obj)
77 value_object *self = (value_object *) obj;
79 /* Remove SELF from the global list. */
81 self->prev->next = self->next;
84 gdb_assert (values_in_python == self);
85 values_in_python = self->next;
88 self->next->prev = self->prev;
90 value_free (self->value);
93 /* Use braces to appease gcc warning. *sigh* */
95 Py_DECREF (self->address);
100 Py_DECREF (self->type);
103 Py_XDECREF (self->dynamic_type);
105 Py_TYPE (self)->tp_free (self);
108 /* Helper to push a Value object on the global list. */
110 note_value (value_object *value_obj)
112 value_obj->next = values_in_python;
114 value_obj->next->prev = value_obj;
115 value_obj->prev = NULL;
116 values_in_python = value_obj;
119 /* Called when a new gdb.Value object needs to be allocated. Returns NULL on
120 error, with a python exception set. */
122 valpy_new (PyTypeObject *subtype, PyObject *args, PyObject *keywords)
124 struct value *value = NULL; /* Initialize to appease gcc warning. */
125 value_object *value_obj;
127 if (PyTuple_Size (args) != 1)
129 PyErr_SetString (PyExc_TypeError, _("Value object creation takes only "
134 value_obj = (value_object *) subtype->tp_alloc (subtype, 1);
135 if (value_obj == NULL)
137 PyErr_SetString (PyExc_MemoryError, _("Could not allocate memory to "
138 "create Value object."));
142 value = convert_value_from_python (PyTuple_GetItem (args, 0));
145 subtype->tp_free (value_obj);
149 value_obj->value = value;
150 release_value_or_incref (value);
151 value_obj->address = NULL;
152 value_obj->type = NULL;
153 value_obj->dynamic_type = NULL;
154 note_value (value_obj);
156 return (PyObject *) value_obj;
159 /* Iterate over all the Value objects, calling preserve_one_value on
162 gdbpy_preserve_values (const struct extension_language_defn *extlang,
163 struct objfile *objfile, htab_t copied_types)
167 for (iter = values_in_python; iter; iter = iter->next)
168 preserve_one_value (iter->value, objfile, copied_types);
171 /* Given a value of a pointer type, apply the C unary * operator to it. */
173 valpy_dereference (PyObject *self, PyObject *args)
175 PyObject *result = NULL;
179 struct value *res_val;
180 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
182 res_val = value_ind (((value_object *) self)->value);
183 result = value_to_value_object (res_val);
184 do_cleanups (cleanup);
186 CATCH (except, RETURN_MASK_ALL)
188 GDB_PY_HANDLE_EXCEPTION (except);
195 /* Given a value of a pointer type or a reference type, return the value
196 referenced. The difference between this function and valpy_dereference is
197 that the latter applies * unary operator to a value, which need not always
198 result in the value referenced. For example, for a value which is a reference
199 to an 'int' pointer ('int *'), valpy_dereference will result in a value of
200 type 'int' while valpy_referenced_value will result in a value of type
204 valpy_referenced_value (PyObject *self, PyObject *args)
206 PyObject *result = NULL;
210 struct value *self_val, *res_val;
211 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
213 self_val = ((value_object *) self)->value;
214 switch (TYPE_CODE (check_typedef (value_type (self_val))))
217 res_val = value_ind (self_val);
220 res_val = coerce_ref (self_val);
223 error(_("Trying to get the referenced value from a value which is "
224 "neither a pointer nor a reference."));
227 result = value_to_value_object (res_val);
228 do_cleanups (cleanup);
230 CATCH (except, RETURN_MASK_ALL)
232 GDB_PY_HANDLE_EXCEPTION (except);
239 /* Return a value which is a reference to the value. */
242 valpy_reference_value (PyObject *self, PyObject *args)
244 PyObject *result = NULL;
248 struct value *self_val;
249 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
251 self_val = ((value_object *) self)->value;
252 result = value_to_value_object (value_ref (self_val));
254 do_cleanups (cleanup);
256 CATCH (except, RETURN_MASK_ALL)
258 GDB_PY_HANDLE_EXCEPTION (except);
265 /* Return a "const" qualified version of the value. */
268 valpy_const_value (PyObject *self, PyObject *args)
270 PyObject *result = NULL;
274 struct value *self_val, *res_val;
275 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
277 self_val = ((value_object *) self)->value;
278 res_val = make_cv_value (1, 0, self_val);
279 result = value_to_value_object (res_val);
281 do_cleanups (cleanup);
283 CATCH (except, RETURN_MASK_ALL)
285 GDB_PY_HANDLE_EXCEPTION (except);
292 /* Return "&value". */
294 valpy_get_address (PyObject *self, void *closure)
296 value_object *val_obj = (value_object *) self;
298 if (!val_obj->address)
302 struct value *res_val;
303 struct cleanup *cleanup
304 = make_cleanup_value_free_to_mark (value_mark ());
306 res_val = value_addr (val_obj->value);
307 val_obj->address = value_to_value_object (res_val);
308 do_cleanups (cleanup);
310 CATCH (except, RETURN_MASK_ALL)
312 val_obj->address = Py_None;
318 Py_XINCREF (val_obj->address);
320 return val_obj->address;
323 /* Return type of the value. */
325 valpy_get_type (PyObject *self, void *closure)
327 value_object *obj = (value_object *) self;
331 obj->type = type_to_type_object (value_type (obj->value));
335 Py_INCREF (obj->type);
339 /* Return dynamic type of the value. */
342 valpy_get_dynamic_type (PyObject *self, void *closure)
344 value_object *obj = (value_object *) self;
345 struct type *type = NULL;
347 if (obj->dynamic_type != NULL)
349 Py_INCREF (obj->dynamic_type);
350 return obj->dynamic_type;
355 struct value *val = obj->value;
356 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
358 type = value_type (val);
359 type = check_typedef (type);
361 if (((TYPE_CODE (type) == TYPE_CODE_PTR)
362 || (TYPE_CODE (type) == TYPE_CODE_REF))
363 && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT))
365 struct value *target;
366 int was_pointer = TYPE_CODE (type) == TYPE_CODE_PTR;
369 target = value_ind (val);
371 target = coerce_ref (val);
372 type = value_rtti_type (target, NULL, NULL, NULL);
377 type = lookup_pointer_type (type);
379 type = lookup_reference_type (type);
382 else if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
383 type = value_rtti_type (val, NULL, NULL, NULL);
386 /* Re-use object's static type. */
390 do_cleanups (cleanup);
392 CATCH (except, RETURN_MASK_ALL)
394 GDB_PY_HANDLE_EXCEPTION (except);
399 obj->dynamic_type = valpy_get_type (self, NULL);
401 obj->dynamic_type = type_to_type_object (type);
403 Py_XINCREF (obj->dynamic_type);
404 return obj->dynamic_type;
407 /* Implementation of gdb.Value.lazy_string ([encoding] [, length]) ->
408 string. Return a PyObject representing a lazy_string_object type.
409 A lazy string is a pointer to a string with an optional encoding and
410 length. If ENCODING is not given, encoding is set to None. If an
411 ENCODING is provided the encoding parameter is set to ENCODING, but
412 the string is not encoded. If LENGTH is provided then the length
413 parameter is set to LENGTH, otherwise length will be set to -1 (first
414 null of appropriate with). */
416 valpy_lazy_string (PyObject *self, PyObject *args, PyObject *kw)
418 gdb_py_longest length = -1;
419 struct value *value = ((value_object *) self)->value;
420 const char *user_encoding = NULL;
421 static char *keywords[] = { "encoding", "length", NULL };
422 PyObject *str_obj = NULL;
424 if (!PyArg_ParseTupleAndKeywords (args, kw, "|s" GDB_PY_LL_ARG, keywords,
425 &user_encoding, &length))
430 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
432 if (TYPE_CODE (value_type (value)) == TYPE_CODE_PTR)
433 value = value_ind (value);
435 str_obj = gdbpy_create_lazy_string_object (value_address (value), length,
439 do_cleanups (cleanup);
441 CATCH (except, RETURN_MASK_ALL)
443 GDB_PY_HANDLE_EXCEPTION (except);
450 /* Implementation of gdb.Value.string ([encoding] [, errors]
451 [, length]) -> string. Return Unicode string with value contents.
452 If ENCODING is not given, the string is assumed to be encoded in
453 the target's charset. If LENGTH is provided, only fetch string to
454 the length provided. */
457 valpy_string (PyObject *self, PyObject *args, PyObject *kw)
461 struct value *value = ((value_object *) self)->value;
463 const char *encoding = NULL;
464 const char *errors = NULL;
465 const char *user_encoding = NULL;
466 const char *la_encoding = NULL;
467 struct type *char_type;
468 static char *keywords[] = { "encoding", "errors", "length", NULL };
470 if (!PyArg_ParseTupleAndKeywords (args, kw, "|ssi", keywords,
471 &user_encoding, &errors, &length))
476 LA_GET_STRING (value, &buffer, &length, &char_type, &la_encoding);
478 CATCH (except, RETURN_MASK_ALL)
480 GDB_PY_HANDLE_EXCEPTION (except);
484 encoding = (user_encoding && *user_encoding) ? user_encoding : la_encoding;
485 unicode = PyUnicode_Decode ((const char *) buffer,
486 length * TYPE_LENGTH (char_type),
493 /* A helper function that implements the various cast operators. */
496 valpy_do_cast (PyObject *self, PyObject *args, enum exp_opcode op)
498 PyObject *type_obj, *result = NULL;
501 if (! PyArg_ParseTuple (args, "O", &type_obj))
504 type = type_object_to_type (type_obj);
507 PyErr_SetString (PyExc_RuntimeError,
508 _("Argument must be a type."));
514 struct value *val = ((value_object *) self)->value;
515 struct value *res_val;
516 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
518 if (op == UNOP_DYNAMIC_CAST)
519 res_val = value_dynamic_cast (type, val);
520 else if (op == UNOP_REINTERPRET_CAST)
521 res_val = value_reinterpret_cast (type, val);
524 gdb_assert (op == UNOP_CAST);
525 res_val = value_cast (type, val);
528 result = value_to_value_object (res_val);
529 do_cleanups (cleanup);
531 CATCH (except, RETURN_MASK_ALL)
533 GDB_PY_HANDLE_EXCEPTION (except);
540 /* Implementation of the "cast" method. */
543 valpy_cast (PyObject *self, PyObject *args)
545 return valpy_do_cast (self, args, UNOP_CAST);
548 /* Implementation of the "dynamic_cast" method. */
551 valpy_dynamic_cast (PyObject *self, PyObject *args)
553 return valpy_do_cast (self, args, UNOP_DYNAMIC_CAST);
556 /* Implementation of the "reinterpret_cast" method. */
559 valpy_reinterpret_cast (PyObject *self, PyObject *args)
561 return valpy_do_cast (self, args, UNOP_REINTERPRET_CAST);
565 valpy_length (PyObject *self)
567 /* We don't support getting the number of elements in a struct / class. */
568 PyErr_SetString (PyExc_NotImplementedError,
569 _("Invalid operation on gdb.Value."));
573 /* Return 1 if the gdb.Field object FIELD is present in the value V.
574 Returns 0 otherwise. If any Python error occurs, -1 is returned. */
577 value_has_field (struct value *v, PyObject *field)
579 struct type *parent_type, *val_type;
580 enum type_code type_code;
581 PyObject *type_object = PyObject_GetAttrString (field, "parent_type");
584 if (type_object == NULL)
587 parent_type = type_object_to_type (type_object);
588 Py_DECREF (type_object);
589 if (parent_type == NULL)
591 PyErr_SetString (PyExc_TypeError,
592 _("'parent_type' attribute of gdb.Field object is not a"
593 "gdb.Type object."));
599 val_type = value_type (v);
600 val_type = check_typedef (val_type);
601 if (TYPE_CODE (val_type) == TYPE_CODE_REF
602 || TYPE_CODE (val_type) == TYPE_CODE_PTR)
603 val_type = check_typedef (TYPE_TARGET_TYPE (val_type));
605 type_code = TYPE_CODE (val_type);
606 if ((type_code == TYPE_CODE_STRUCT || type_code == TYPE_CODE_UNION)
607 && types_equal (val_type, parent_type))
612 CATCH (except, RETURN_MASK_ALL)
614 GDB_PY_SET_HANDLE_EXCEPTION (except);
621 /* Return the value of a flag FLAG_NAME in a gdb.Field object FIELD.
622 Returns 1 if the flag value is true, 0 if it is false, and -1 if
623 a Python error occurs. */
626 get_field_flag (PyObject *field, const char *flag_name)
629 PyObject *flag_object = PyObject_GetAttrString (field, flag_name);
631 if (flag_object == NULL)
634 flag_value = PyObject_IsTrue (flag_object);
635 Py_DECREF (flag_object);
640 /* Return the "type" attribute of a gdb.Field object.
641 Returns NULL on error, with a Python exception set. */
644 get_field_type (PyObject *field)
646 PyObject *ftype_obj = PyObject_GetAttrString (field, "type");
649 if (ftype_obj == NULL)
651 ftype = type_object_to_type (ftype_obj);
652 Py_DECREF (ftype_obj);
654 PyErr_SetString (PyExc_TypeError,
655 _("'type' attribute of gdb.Field object is not a "
656 "gdb.Type object."));
661 /* Given string name or a gdb.Field object corresponding to an element inside
662 a structure, return its value object. Returns NULL on error, with a python
666 valpy_getitem (PyObject *self, PyObject *key)
668 struct gdb_exception except = exception_none;
669 value_object *self_value = (value_object *) self;
671 struct type *base_class_type = NULL, *field_type = NULL;
673 PyObject *result = NULL;
675 if (gdbpy_is_string (key))
677 field = python_string_to_host_string (key);
681 else if (gdbpy_is_field (key))
683 int is_base_class, valid_field;
685 valid_field = value_has_field (self_value->value, key);
688 else if (valid_field == 0)
690 PyErr_SetString (PyExc_TypeError,
691 _("Invalid lookup for a field not contained in "
697 is_base_class = get_field_flag (key, "is_base_class");
698 if (is_base_class < 0)
700 else if (is_base_class > 0)
702 base_class_type = get_field_type (key);
703 if (base_class_type == NULL)
708 PyObject *name_obj = PyObject_GetAttrString (key, "name");
710 if (name_obj == NULL)
713 if (name_obj != Py_None)
715 field = python_string_to_host_string (name_obj);
716 Py_DECREF (name_obj);
722 PyObject *bitpos_obj;
725 Py_DECREF (name_obj);
727 if (!PyObject_HasAttrString (key, "bitpos"))
729 PyErr_SetString (PyExc_AttributeError,
730 _("gdb.Field object has no name and no "
731 "'bitpos' attribute."));
735 bitpos_obj = PyObject_GetAttrString (key, "bitpos");
736 if (bitpos_obj == NULL)
738 valid = gdb_py_int_as_long (bitpos_obj, &bitpos);
739 Py_DECREF (bitpos_obj);
743 field_type = get_field_type (key);
744 if (field_type == NULL)
752 struct value *tmp = self_value->value;
753 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
754 struct value *res_val = NULL;
757 res_val = value_struct_elt (&tmp, NULL, field, NULL,
758 "struct/class/union");
759 else if (bitpos >= 0)
760 res_val = value_struct_elt_bitpos (&tmp, bitpos, field_type,
761 "struct/class/union");
762 else if (base_class_type != NULL)
764 struct type *val_type;
766 val_type = check_typedef (value_type (tmp));
767 if (TYPE_CODE (val_type) == TYPE_CODE_PTR)
768 res_val = value_cast (lookup_pointer_type (base_class_type), tmp);
769 else if (TYPE_CODE (val_type) == TYPE_CODE_REF)
770 res_val = value_cast (lookup_reference_type (base_class_type), tmp);
772 res_val = value_cast (base_class_type, tmp);
776 /* Assume we are attempting an array access, and let the
777 value code throw an exception if the index has an invalid
779 struct value *idx = convert_value_from_python (key);
783 /* Check the value's type is something that can be accessed via
787 tmp = coerce_ref (tmp);
788 type = check_typedef (value_type (tmp));
789 if (TYPE_CODE (type) != TYPE_CODE_ARRAY
790 && TYPE_CODE (type) != TYPE_CODE_PTR)
791 error (_("Cannot subscript requested type."));
793 res_val = value_subscript (tmp, value_as_long (idx));
798 result = value_to_value_object (res_val);
799 do_cleanups (cleanup);
801 CATCH (ex, RETURN_MASK_ALL)
808 GDB_PY_HANDLE_EXCEPTION (except);
814 valpy_setitem (PyObject *self, PyObject *key, PyObject *value)
816 PyErr_Format (PyExc_NotImplementedError,
817 _("Setting of struct elements is not currently supported."));
821 /* Called by the Python interpreter to perform an inferior function
822 call on the value. Returns NULL on error, with a python exception set. */
824 valpy_call (PyObject *self, PyObject *args, PyObject *keywords)
826 Py_ssize_t args_count;
827 struct value *function = ((value_object *) self)->value;
828 struct value **vargs = NULL;
829 struct type *ftype = NULL;
830 struct value *mark = value_mark ();
831 PyObject *result = NULL;
835 ftype = check_typedef (value_type (function));
837 CATCH (except, RETURN_MASK_ALL)
839 GDB_PY_HANDLE_EXCEPTION (except);
843 if (TYPE_CODE (ftype) != TYPE_CODE_FUNC)
845 PyErr_SetString (PyExc_RuntimeError,
846 _("Value is not callable (not TYPE_CODE_FUNC)."));
850 if (! PyTuple_Check (args))
852 PyErr_SetString (PyExc_TypeError,
853 _("Inferior arguments must be provided in a tuple."));
857 args_count = PyTuple_Size (args);
862 vargs = XALLOCAVEC (struct value *, args_count);
863 for (i = 0; i < args_count; i++)
865 PyObject *item = PyTuple_GetItem (args, i);
870 vargs[i] = convert_value_from_python (item);
871 if (vargs[i] == NULL)
878 struct cleanup *cleanup = make_cleanup_value_free_to_mark (mark);
879 struct value *return_value;
881 return_value = call_function_by_hand (function, args_count, vargs);
882 result = value_to_value_object (return_value);
883 do_cleanups (cleanup);
885 CATCH (except, RETURN_MASK_ALL)
887 GDB_PY_HANDLE_EXCEPTION (except);
894 /* Called by the Python interpreter to obtain string representation
897 valpy_str (PyObject *self)
901 struct value_print_options opts;
903 get_user_print_options (&opts);
908 struct ui_file *stb = mem_fileopen ();
909 struct cleanup *old_chain = make_cleanup_ui_file_delete (stb);
911 common_val_print (((value_object *) self)->value, stb, 0,
912 &opts, python_language);
913 s = ui_file_xstrdup (stb, NULL);
915 do_cleanups (old_chain);
917 CATCH (except, RETURN_MASK_ALL)
919 GDB_PY_HANDLE_EXCEPTION (except);
923 result = PyUnicode_Decode (s, strlen (s), host_charset (), NULL);
929 /* Implements gdb.Value.is_optimized_out. */
931 valpy_get_is_optimized_out (PyObject *self, void *closure)
933 struct value *value = ((value_object *) self)->value;
938 opt = value_optimized_out (value);
940 CATCH (except, RETURN_MASK_ALL)
942 GDB_PY_HANDLE_EXCEPTION (except);
952 /* Implements gdb.Value.is_lazy. */
954 valpy_get_is_lazy (PyObject *self, void *closure)
956 struct value *value = ((value_object *) self)->value;
961 opt = value_lazy (value);
963 CATCH (except, RETURN_MASK_ALL)
965 GDB_PY_HANDLE_EXCEPTION (except);
975 /* Implements gdb.Value.fetch_lazy (). */
977 valpy_fetch_lazy (PyObject *self, PyObject *args)
979 struct value *value = ((value_object *) self)->value;
983 if (value_lazy (value))
984 value_fetch_lazy (value);
986 CATCH (except, RETURN_MASK_ALL)
988 GDB_PY_HANDLE_EXCEPTION (except);
995 /* Calculate and return the address of the PyObject as the value of
996 the builtin __hash__ call. */
998 valpy_hash (PyObject *self)
1000 return (intptr_t) self;
1018 /* If TYPE is a reference, return the target; otherwise return TYPE. */
1019 #define STRIP_REFERENCE(TYPE) \
1020 ((TYPE_CODE (TYPE) == TYPE_CODE_REF) ? (TYPE_TARGET_TYPE (TYPE)) : (TYPE))
1022 /* Helper for valpy_binop. Returns a value object which is the result
1023 of applying the operation specified by OPCODE to the given
1024 arguments. Throws a GDB exception on error. */
1027 valpy_binop_throw (enum valpy_opcode opcode, PyObject *self, PyObject *other)
1029 PyObject *result = NULL;
1031 struct value *arg1, *arg2;
1032 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
1033 struct value *res_val = NULL;
1034 enum exp_opcode op = OP_NULL;
1037 /* If the gdb.Value object is the second operand, then it will be
1038 passed to us as the OTHER argument, and SELF will be an entirely
1039 different kind of object, altogether. Because of this, we can't
1040 assume self is a gdb.Value object and need to convert it from
1042 arg1 = convert_value_from_python (self);
1045 do_cleanups (cleanup);
1049 arg2 = convert_value_from_python (other);
1052 do_cleanups (cleanup);
1060 struct type *ltype = value_type (arg1);
1061 struct type *rtype = value_type (arg2);
1063 ltype = check_typedef (ltype);
1064 ltype = STRIP_REFERENCE (ltype);
1065 rtype = check_typedef (rtype);
1066 rtype = STRIP_REFERENCE (rtype);
1069 if (TYPE_CODE (ltype) == TYPE_CODE_PTR
1070 && is_integral_type (rtype))
1071 res_val = value_ptradd (arg1, value_as_long (arg2));
1072 else if (TYPE_CODE (rtype) == TYPE_CODE_PTR
1073 && is_integral_type (ltype))
1074 res_val = value_ptradd (arg2, value_as_long (arg1));
1084 struct type *ltype = value_type (arg1);
1085 struct type *rtype = value_type (arg2);
1087 ltype = check_typedef (ltype);
1088 ltype = STRIP_REFERENCE (ltype);
1089 rtype = check_typedef (rtype);
1090 rtype = STRIP_REFERENCE (rtype);
1093 if (TYPE_CODE (ltype) == TYPE_CODE_PTR
1094 && TYPE_CODE (rtype) == TYPE_CODE_PTR)
1095 /* A ptrdiff_t for the target would be preferable here. */
1096 res_val = value_from_longest (builtin_type_pyint,
1097 value_ptrdiff (arg1, arg2));
1098 else if (TYPE_CODE (ltype) == TYPE_CODE_PTR
1099 && is_integral_type (rtype))
1100 res_val = value_ptradd (arg1, - value_as_long (arg2));
1127 op = BINOP_BITWISE_AND;
1130 op = BINOP_BITWISE_IOR;
1133 op = BINOP_BITWISE_XOR;
1139 if (binop_user_defined_p (op, arg1, arg2))
1140 res_val = value_x_binop (arg1, arg2, op, OP_NULL, EVAL_NORMAL);
1142 res_val = value_binop (arg1, arg2, op);
1146 result = value_to_value_object (res_val);
1148 do_cleanups (cleanup);
1152 /* Returns a value object which is the result of applying the operation
1153 specified by OPCODE to the given arguments. Returns NULL on error, with
1154 a python exception set. */
1156 valpy_binop (enum valpy_opcode opcode, PyObject *self, PyObject *other)
1158 PyObject *result = NULL;
1162 result = valpy_binop_throw (opcode, self, other);
1164 CATCH (except, RETURN_MASK_ALL)
1166 GDB_PY_HANDLE_EXCEPTION (except);
1174 valpy_add (PyObject *self, PyObject *other)
1176 return valpy_binop (VALPY_ADD, self, other);
1180 valpy_subtract (PyObject *self, PyObject *other)
1182 return valpy_binop (VALPY_SUB, self, other);
1186 valpy_multiply (PyObject *self, PyObject *other)
1188 return valpy_binop (VALPY_MUL, self, other);
1192 valpy_divide (PyObject *self, PyObject *other)
1194 return valpy_binop (VALPY_DIV, self, other);
1198 valpy_remainder (PyObject *self, PyObject *other)
1200 return valpy_binop (VALPY_REM, self, other);
1204 valpy_power (PyObject *self, PyObject *other, PyObject *unused)
1206 /* We don't support the ternary form of pow. I don't know how to express
1207 that, so let's just throw NotImplementedError to at least do something
1209 if (unused != Py_None)
1211 PyErr_SetString (PyExc_NotImplementedError,
1212 "Invalid operation on gdb.Value.");
1216 return valpy_binop (VALPY_POW, self, other);
1220 valpy_negative (PyObject *self)
1222 PyObject *result = NULL;
1226 /* Perhaps overkill, but consistency has some virtue. */
1227 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
1230 val = value_neg (((value_object *) self)->value);
1231 result = value_to_value_object (val);
1232 do_cleanups (cleanup);
1234 CATCH (except, RETURN_MASK_ALL)
1236 GDB_PY_HANDLE_EXCEPTION (except);
1244 valpy_positive (PyObject *self)
1246 return value_to_value_object (((value_object *) self)->value);
1250 valpy_absolute (PyObject *self)
1252 struct value *value = ((value_object *) self)->value;
1257 struct cleanup *cleanup = make_cleanup_value_free_to_mark (value_mark ());
1259 if (value_less (value, value_zero (value_type (value), not_lval)))
1262 do_cleanups (cleanup);
1264 CATCH (except, RETURN_MASK_ALL)
1266 GDB_PY_HANDLE_EXCEPTION (except);
1271 return valpy_positive (self);
1273 return valpy_negative (self);
1276 /* Implements boolean evaluation of gdb.Value. */
1278 valpy_nonzero (PyObject *self)
1280 struct gdb_exception except = exception_none;
1281 value_object *self_value = (value_object *) self;
1283 int nonzero = 0; /* Appease GCC warning. */
1287 type = check_typedef (value_type (self_value->value));
1289 if (is_integral_type (type) || TYPE_CODE (type) == TYPE_CODE_PTR)
1290 nonzero = !!value_as_long (self_value->value);
1291 else if (TYPE_CODE (type) == TYPE_CODE_FLT)
1292 nonzero = value_as_double (self_value->value) != 0;
1293 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
1294 nonzero = !decimal_is_zero (value_contents (self_value->value),
1296 gdbarch_byte_order (get_type_arch (type)));
1298 /* All other values are True. */
1301 CATCH (ex, RETURN_MASK_ALL)
1307 /* This is not documented in the Python documentation, but if this
1308 function fails, return -1 as slot_nb_nonzero does (the default
1309 Python nonzero function). */
1310 GDB_PY_SET_HANDLE_EXCEPTION (except);
1315 /* Implements ~ for value objects. */
1317 valpy_invert (PyObject *self)
1319 struct value *val = NULL;
1323 val = value_complement (((value_object *) self)->value);
1325 CATCH (except, RETURN_MASK_ALL)
1327 GDB_PY_HANDLE_EXCEPTION (except);
1331 return value_to_value_object (val);
1334 /* Implements left shift for value objects. */
1336 valpy_lsh (PyObject *self, PyObject *other)
1338 return valpy_binop (VALPY_LSH, self, other);
1341 /* Implements right shift for value objects. */
1343 valpy_rsh (PyObject *self, PyObject *other)
1345 return valpy_binop (VALPY_RSH, self, other);
1348 /* Implements bitwise and for value objects. */
1350 valpy_and (PyObject *self, PyObject *other)
1352 return valpy_binop (VALPY_BITAND, self, other);
1355 /* Implements bitwise or for value objects. */
1357 valpy_or (PyObject *self, PyObject *other)
1359 return valpy_binop (VALPY_BITOR, self, other);
1362 /* Implements bitwise xor for value objects. */
1364 valpy_xor (PyObject *self, PyObject *other)
1366 return valpy_binop (VALPY_BITXOR, self, other);
1369 /* Helper for valpy_richcompare. Implements comparison operations for
1370 value objects. Returns true/false on success. Returns -1 with a
1371 Python exception set if a Python error is detected. Throws a GDB
1372 exception on other errors (memory error, etc.). */
1375 valpy_richcompare_throw (PyObject *self, PyObject *other, int op)
1378 struct value *value_other;
1379 struct value *value_self;
1380 struct value *mark = value_mark ();
1381 struct cleanup *cleanup;
1383 value_other = convert_value_from_python (other);
1384 if (value_other == NULL)
1387 cleanup = make_cleanup_value_free_to_mark (mark);
1389 value_self = ((value_object *) self)->value;
1394 result = value_less (value_self, value_other);
1397 result = value_less (value_self, value_other)
1398 || value_equal (value_self, value_other);
1401 result = value_equal (value_self, value_other);
1404 result = !value_equal (value_self, value_other);
1407 result = value_less (value_other, value_self);
1410 result = (value_less (value_other, value_self)
1411 || value_equal (value_self, value_other));
1415 PyErr_SetString (PyExc_NotImplementedError,
1416 _("Invalid operation on gdb.Value."));
1421 do_cleanups (cleanup);
1426 /* Implements comparison operations for value objects. Returns NULL on error,
1427 with a python exception set. */
1429 valpy_richcompare (PyObject *self, PyObject *other, int op)
1433 if (other == Py_None)
1434 /* Comparing with None is special. From what I can tell, in Python
1435 None is smaller than anything else. */
1447 PyErr_SetString (PyExc_NotImplementedError,
1448 _("Invalid operation on gdb.Value."));
1454 result = valpy_richcompare_throw (self, other, op);
1456 CATCH (except, RETURN_MASK_ALL)
1458 GDB_PY_HANDLE_EXCEPTION (except);
1462 /* In this case, the Python exception has already been set. */
1473 /* Implements conversion to int. */
1475 valpy_int (PyObject *self)
1477 struct value *value = ((value_object *) self)->value;
1478 struct type *type = value_type (value);
1483 if (!is_integral_type (type))
1484 error (_("Cannot convert value to int."));
1486 l = value_as_long (value);
1488 CATCH (except, RETURN_MASK_ALL)
1490 GDB_PY_HANDLE_EXCEPTION (except);
1494 return gdb_py_object_from_longest (l);
1498 /* Implements conversion to long. */
1500 valpy_long (PyObject *self)
1502 struct value *value = ((value_object *) self)->value;
1503 struct type *type = value_type (value);
1508 type = check_typedef (type);
1510 if (!is_integral_type (type)
1511 && TYPE_CODE (type) != TYPE_CODE_PTR)
1512 error (_("Cannot convert value to long."));
1514 l = value_as_long (value);
1516 CATCH (except, RETURN_MASK_ALL)
1518 GDB_PY_HANDLE_EXCEPTION (except);
1522 if (TYPE_UNSIGNED (type))
1523 return gdb_py_long_from_ulongest (l);
1525 return gdb_py_long_from_longest (l);
1528 /* Implements conversion to float. */
1530 valpy_float (PyObject *self)
1532 struct value *value = ((value_object *) self)->value;
1533 struct type *type = value_type (value);
1538 type = check_typedef (type);
1540 if (TYPE_CODE (type) != TYPE_CODE_FLT)
1541 error (_("Cannot convert value to float."));
1543 d = value_as_double (value);
1545 CATCH (except, RETURN_MASK_ALL)
1547 GDB_PY_HANDLE_EXCEPTION (except);
1551 return PyFloat_FromDouble (d);
1554 /* Returns an object for a value which is released from the all_values chain,
1555 so its lifetime is not bound to the execution of a command. */
1557 value_to_value_object (struct value *val)
1559 value_object *val_obj;
1561 val_obj = PyObject_New (value_object, &value_object_type);
1562 if (val_obj != NULL)
1564 val_obj->value = val;
1565 release_value_or_incref (val);
1566 val_obj->address = NULL;
1567 val_obj->type = NULL;
1568 val_obj->dynamic_type = NULL;
1569 note_value (val_obj);
1572 return (PyObject *) val_obj;
1575 /* Returns a borrowed reference to the struct value corresponding to
1576 the given value object. */
1578 value_object_to_value (PyObject *self)
1582 if (! PyObject_TypeCheck (self, &value_object_type))
1584 real = (value_object *) self;
1588 /* Try to convert a Python value to a gdb value. If the value cannot
1589 be converted, set a Python exception and return NULL. Returns a
1590 reference to a new value on the all_values chain. */
1593 convert_value_from_python (PyObject *obj)
1595 struct value *value = NULL; /* -Wall */
1598 gdb_assert (obj != NULL);
1602 if (PyBool_Check (obj))
1604 cmp = PyObject_IsTrue (obj);
1606 value = value_from_longest (builtin_type_pybool, cmp);
1608 /* Make a long logic check first. In Python 3.x, internally,
1609 all integers are represented as longs. In Python 2.x, there
1610 is still a differentiation internally between a PyInt and a
1611 PyLong. Explicitly do this long check conversion first. In
1612 GDB, for Python 3.x, we #ifdef PyInt = PyLong. This check has
1613 to be done first to ensure we do not lose information in the
1614 conversion process. */
1615 else if (PyLong_Check (obj))
1617 LONGEST l = PyLong_AsLongLong (obj);
1619 if (PyErr_Occurred ())
1621 /* If the error was an overflow, we can try converting to
1622 ULONGEST instead. */
1623 if (PyErr_ExceptionMatches (PyExc_OverflowError))
1625 PyObject *etype, *evalue, *etraceback, *zero;
1627 PyErr_Fetch (&etype, &evalue, &etraceback);
1628 zero = PyInt_FromLong (0);
1630 /* Check whether obj is positive. */
1631 if (PyObject_RichCompareBool (obj, zero, Py_GT) > 0)
1635 ul = PyLong_AsUnsignedLongLong (obj);
1636 if (! PyErr_Occurred ())
1637 value = value_from_ulongest (builtin_type_upylong, ul);
1640 /* There's nothing we can do. */
1641 PyErr_Restore (etype, evalue, etraceback);
1647 value = value_from_longest (builtin_type_pylong, l);
1649 #if PY_MAJOR_VERSION == 2
1650 else if (PyInt_Check (obj))
1652 long l = PyInt_AsLong (obj);
1654 if (! PyErr_Occurred ())
1655 value = value_from_longest (builtin_type_pyint, l);
1658 else if (PyFloat_Check (obj))
1660 double d = PyFloat_AsDouble (obj);
1662 if (! PyErr_Occurred ())
1663 value = value_from_double (builtin_type_pyfloat, d);
1665 else if (gdbpy_is_string (obj))
1669 s = python_string_to_target_string (obj);
1672 struct cleanup *old;
1674 old = make_cleanup (xfree, s);
1675 value = value_cstring (s, strlen (s), builtin_type_pychar);
1679 else if (PyObject_TypeCheck (obj, &value_object_type))
1680 value = value_copy (((value_object *) obj)->value);
1681 else if (gdbpy_is_lazy_string (obj))
1685 result = PyObject_CallMethodObjArgs (obj, gdbpy_value_cst, NULL);
1686 value = value_copy (((value_object *) result)->value);
1690 PyErr_Format (PyExc_TypeError,
1691 _("Could not convert Python object: %S."), obj);
1693 PyErr_Format (PyExc_TypeError,
1694 _("Could not convert Python object: %s."),
1695 PyString_AsString (PyObject_Str (obj)));
1698 CATCH (except, RETURN_MASK_ALL)
1700 PyErr_Format (except.reason == RETURN_QUIT
1701 ? PyExc_KeyboardInterrupt : PyExc_RuntimeError,
1702 "%s", except.message);
1710 /* Returns value object in the ARGth position in GDB's history. */
1712 gdbpy_history (PyObject *self, PyObject *args)
1715 struct value *res_val = NULL; /* Initialize to appease gcc warning. */
1717 if (!PyArg_ParseTuple (args, "i", &i))
1722 res_val = access_value_history (i);
1724 CATCH (except, RETURN_MASK_ALL)
1726 GDB_PY_HANDLE_EXCEPTION (except);
1730 return value_to_value_object (res_val);
1733 /* Returns 1 in OBJ is a gdb.Value object, 0 otherwise. */
1736 gdbpy_is_value_object (PyObject *obj)
1738 return PyObject_TypeCheck (obj, &value_object_type);
1742 gdbpy_initialize_values (void)
1744 if (PyType_Ready (&value_object_type) < 0)
1747 return gdb_pymodule_addobject (gdb_module, "Value",
1748 (PyObject *) &value_object_type);
1753 static PyGetSetDef value_object_getset[] = {
1754 { "address", valpy_get_address, NULL, "The address of the value.",
1756 { "is_optimized_out", valpy_get_is_optimized_out, NULL,
1757 "Boolean telling whether the value is optimized "
1758 "out (i.e., not available).",
1760 { "type", valpy_get_type, NULL, "Type of the value.", NULL },
1761 { "dynamic_type", valpy_get_dynamic_type, NULL,
1762 "Dynamic type of the value.", NULL },
1763 { "is_lazy", valpy_get_is_lazy, NULL,
1764 "Boolean telling whether the value is lazy (not fetched yet\n\
1765 from the inferior). A lazy value is fetched when needed, or when\n\
1766 the \"fetch_lazy()\" method is called.", NULL },
1767 {NULL} /* Sentinel */
1770 static PyMethodDef value_object_methods[] = {
1771 { "cast", valpy_cast, METH_VARARGS, "Cast the value to the supplied type." },
1772 { "dynamic_cast", valpy_dynamic_cast, METH_VARARGS,
1773 "dynamic_cast (gdb.Type) -> gdb.Value\n\
1774 Cast the value to the supplied type, as if by the C++ dynamic_cast operator."
1776 { "reinterpret_cast", valpy_reinterpret_cast, METH_VARARGS,
1777 "reinterpret_cast (gdb.Type) -> gdb.Value\n\
1778 Cast the value to the supplied type, as if by the C++\n\
1779 reinterpret_cast operator."
1781 { "dereference", valpy_dereference, METH_NOARGS, "Dereferences the value." },
1782 { "referenced_value", valpy_referenced_value, METH_NOARGS,
1783 "Return the value referenced by a TYPE_CODE_REF or TYPE_CODE_PTR value." },
1784 { "reference_value", valpy_reference_value, METH_NOARGS,
1785 "Return a value of type TYPE_CODE_REF referencing this value." },
1786 { "const_value", valpy_const_value, METH_NOARGS,
1787 "Return a 'const' qualied version of the same value." },
1788 { "lazy_string", (PyCFunction) valpy_lazy_string,
1789 METH_VARARGS | METH_KEYWORDS,
1790 "lazy_string ([encoding] [, length]) -> lazy_string\n\
1791 Return a lazy string representation of the value." },
1792 { "string", (PyCFunction) valpy_string, METH_VARARGS | METH_KEYWORDS,
1793 "string ([encoding] [, errors] [, length]) -> string\n\
1794 Return Unicode string representation of the value." },
1795 { "fetch_lazy", valpy_fetch_lazy, METH_NOARGS,
1796 "Fetches the value from the inferior, if it was lazy." },
1797 {NULL} /* Sentinel */
1800 static PyNumberMethods value_object_as_number = {
1808 NULL, /* nb_divmod */
1809 valpy_power, /* nb_power */
1810 valpy_negative, /* nb_negative */
1811 valpy_positive, /* nb_positive */
1812 valpy_absolute, /* nb_absolute */
1813 valpy_nonzero, /* nb_nonzero */
1814 valpy_invert, /* nb_invert */
1815 valpy_lsh, /* nb_lshift */
1816 valpy_rsh, /* nb_rshift */
1817 valpy_and, /* nb_and */
1818 valpy_xor, /* nb_xor */
1819 valpy_or, /* nb_or */
1821 valpy_long, /* nb_int */
1822 NULL, /* reserved */
1824 NULL, /* nb_coerce */
1825 valpy_int, /* nb_int */
1826 valpy_long, /* nb_long */
1828 valpy_float, /* nb_float */
1833 NULL, /* nb_inplace_add */
1834 NULL, /* nb_inplace_subtract */
1835 NULL, /* nb_inplace_multiply */
1837 NULL, /* nb_inplace_divide */
1839 NULL, /* nb_inplace_remainder */
1840 NULL, /* nb_inplace_power */
1841 NULL, /* nb_inplace_lshift */
1842 NULL, /* nb_inplace_rshift */
1843 NULL, /* nb_inplace_and */
1844 NULL, /* nb_inplace_xor */
1845 NULL, /* nb_inplace_or */
1846 NULL, /* nb_floor_divide */
1847 valpy_divide, /* nb_true_divide */
1848 NULL, /* nb_inplace_floor_divide */
1849 NULL, /* nb_inplace_true_divide */
1850 #ifndef HAVE_LIBPYTHON2_4
1851 /* This was added in Python 2.5. */
1852 valpy_long, /* nb_index */
1853 #endif /* HAVE_LIBPYTHON2_4 */
1856 static PyMappingMethods value_object_as_mapping = {
1862 PyTypeObject value_object_type = {
1863 PyVarObject_HEAD_INIT (NULL, 0)
1864 "gdb.Value", /*tp_name*/
1865 sizeof (value_object), /*tp_basicsize*/
1867 valpy_dealloc, /*tp_dealloc*/
1873 &value_object_as_number, /*tp_as_number*/
1874 0, /*tp_as_sequence*/
1875 &value_object_as_mapping, /*tp_as_mapping*/
1876 valpy_hash, /*tp_hash*/
1877 valpy_call, /*tp_call*/
1878 valpy_str, /*tp_str*/
1882 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES
1883 | Py_TPFLAGS_BASETYPE, /*tp_flags*/
1884 "GDB value object", /* tp_doc */
1885 0, /* tp_traverse */
1887 valpy_richcompare, /* tp_richcompare */
1888 0, /* tp_weaklistoffset */
1890 0, /* tp_iternext */
1891 value_object_methods, /* tp_methods */
1893 value_object_getset, /* tp_getset */
1896 0, /* tp_descr_get */
1897 0, /* tp_descr_set */
1898 0, /* tp_dictoffset */
1901 valpy_new /* tp_new */