1 /* Python interface to symbols.
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/>. */
24 #include "python-internal.h"
27 typedef struct sympy_symbol_object
{
29 /* The GDB symbol structure this object is wrapping. */
30 struct symbol
*symbol
;
31 /* A symbol object is associated with an objfile, so keep track with
32 doubly-linked list, rooted in the objfile. This lets us
33 invalidate the underlying struct symbol when the objfile is
35 struct sympy_symbol_object
*prev
;
36 struct sympy_symbol_object
*next
;
39 /* Require a valid symbol. All access to symbol_object->symbol should be
40 gated by this call. */
41 #define SYMPY_REQUIRE_VALID(symbol_obj, symbol) \
43 symbol = symbol_object_to_symbol (symbol_obj); \
46 PyErr_SetString (PyExc_RuntimeError, \
47 _("Symbol is invalid.")); \
52 static const struct objfile_data
*sympy_objfile_data_key
;
55 sympy_str (PyObject
*self
)
58 struct symbol
*symbol
= NULL
;
60 SYMPY_REQUIRE_VALID (self
, symbol
);
62 result
= PyString_FromString (SYMBOL_PRINT_NAME (symbol
));
68 sympy_get_type (PyObject
*self
, void *closure
)
70 struct symbol
*symbol
= NULL
;
72 SYMPY_REQUIRE_VALID (self
, symbol
);
74 if (SYMBOL_TYPE (symbol
) == NULL
)
80 return type_to_type_object (SYMBOL_TYPE (symbol
));
84 sympy_get_symtab (PyObject
*self
, void *closure
)
86 struct symbol
*symbol
= NULL
;
88 SYMPY_REQUIRE_VALID (self
, symbol
);
90 if (!SYMBOL_OBJFILE_OWNED (symbol
))
93 return symtab_to_symtab_object (symbol_symtab (symbol
));
97 sympy_get_name (PyObject
*self
, void *closure
)
99 struct symbol
*symbol
= NULL
;
101 SYMPY_REQUIRE_VALID (self
, symbol
);
103 return PyString_FromString (SYMBOL_NATURAL_NAME (symbol
));
107 sympy_get_linkage_name (PyObject
*self
, void *closure
)
109 struct symbol
*symbol
= NULL
;
111 SYMPY_REQUIRE_VALID (self
, symbol
);
113 return PyString_FromString (SYMBOL_LINKAGE_NAME (symbol
));
117 sympy_get_print_name (PyObject
*self
, void *closure
)
119 struct symbol
*symbol
= NULL
;
121 SYMPY_REQUIRE_VALID (self
, symbol
);
123 return sympy_str (self
);
127 sympy_get_addr_class (PyObject
*self
, void *closure
)
129 struct symbol
*symbol
= NULL
;
131 SYMPY_REQUIRE_VALID (self
, symbol
);
133 return PyInt_FromLong (SYMBOL_CLASS (symbol
));
137 sympy_is_argument (PyObject
*self
, void *closure
)
139 struct symbol
*symbol
= NULL
;
141 SYMPY_REQUIRE_VALID (self
, symbol
);
143 return PyBool_FromLong (SYMBOL_IS_ARGUMENT (symbol
));
147 sympy_is_constant (PyObject
*self
, void *closure
)
149 struct symbol
*symbol
= NULL
;
150 enum address_class theclass
;
152 SYMPY_REQUIRE_VALID (self
, symbol
);
154 theclass
= SYMBOL_CLASS (symbol
);
156 return PyBool_FromLong (theclass
== LOC_CONST
|| theclass
== LOC_CONST_BYTES
);
160 sympy_is_function (PyObject
*self
, void *closure
)
162 struct symbol
*symbol
= NULL
;
163 enum address_class theclass
;
165 SYMPY_REQUIRE_VALID (self
, symbol
);
167 theclass
= SYMBOL_CLASS (symbol
);
169 return PyBool_FromLong (theclass
== LOC_BLOCK
);
173 sympy_is_variable (PyObject
*self
, void *closure
)
175 struct symbol
*symbol
= NULL
;
176 enum address_class theclass
;
178 SYMPY_REQUIRE_VALID (self
, symbol
);
180 theclass
= SYMBOL_CLASS (symbol
);
182 return PyBool_FromLong (!SYMBOL_IS_ARGUMENT (symbol
)
183 && (theclass
== LOC_LOCAL
|| theclass
== LOC_REGISTER
184 || theclass
== LOC_STATIC
|| theclass
== LOC_COMPUTED
185 || theclass
== LOC_OPTIMIZED_OUT
));
188 /* Implementation of gdb.Symbol.needs_frame -> Boolean.
189 Returns true iff the symbol needs a frame for evaluation. */
192 sympy_needs_frame (PyObject
*self
, void *closure
)
194 struct symbol
*symbol
= NULL
;
197 SYMPY_REQUIRE_VALID (self
, symbol
);
201 result
= symbol_read_needs_frame (symbol
);
203 CATCH (except
, RETURN_MASK_ALL
)
205 GDB_PY_HANDLE_EXCEPTION (except
);
214 /* Implementation of gdb.Symbol.line -> int.
215 Returns the line number at which the symbol was defined. */
218 sympy_line (PyObject
*self
, void *closure
)
220 struct symbol
*symbol
= NULL
;
222 SYMPY_REQUIRE_VALID (self
, symbol
);
224 return PyInt_FromLong (SYMBOL_LINE (symbol
));
227 /* Implementation of gdb.Symbol.is_valid (self) -> Boolean.
228 Returns True if this Symbol still exists in GDB. */
231 sympy_is_valid (PyObject
*self
, PyObject
*args
)
233 struct symbol
*symbol
= NULL
;
235 symbol
= symbol_object_to_symbol (self
);
242 /* Implementation of gdb.Symbol.value (self[, frame]) -> gdb.Value. Returns
243 the value of the symbol, or an error in various circumstances. */
246 sympy_value (PyObject
*self
, PyObject
*args
)
248 struct symbol
*symbol
= NULL
;
249 struct frame_info
*frame_info
= NULL
;
250 PyObject
*frame_obj
= NULL
;
251 struct value
*value
= NULL
;
253 if (!PyArg_ParseTuple (args
, "|O", &frame_obj
))
256 if (frame_obj
!= NULL
&& !PyObject_TypeCheck (frame_obj
, &frame_object_type
))
258 PyErr_SetString (PyExc_TypeError
, "argument is not a frame");
262 SYMPY_REQUIRE_VALID (self
, symbol
);
263 if (SYMBOL_CLASS (symbol
) == LOC_TYPEDEF
)
265 PyErr_SetString (PyExc_TypeError
, "cannot get the value of a typedef");
271 if (frame_obj
!= NULL
)
273 frame_info
= frame_object_to_frame_info (frame_obj
);
274 if (frame_info
== NULL
)
275 error (_("invalid frame"));
278 if (symbol_read_needs_frame (symbol
) && frame_info
== NULL
)
279 error (_("symbol requires a frame to compute its value"));
281 /* TODO: currently, we have no way to recover the block in which SYMBOL
282 was found, so we have no block to pass to read_var_value. This will
283 yield an incorrect value when symbol is not local to FRAME_INFO (this
284 can happen with nested functions). */
285 value
= read_var_value (symbol
, NULL
, frame_info
);
287 CATCH (except
, RETURN_MASK_ALL
)
289 GDB_PY_HANDLE_EXCEPTION (except
);
293 return value_to_value_object (value
);
296 /* Given a symbol, and a symbol_object that has previously been
297 allocated and initialized, populate the symbol_object with the
298 struct symbol data. Also, register the symbol_object life-cycle
299 with the life-cycle of the object file associated with this
300 symbol, if needed. */
302 set_symbol (symbol_object
*obj
, struct symbol
*symbol
)
304 obj
->symbol
= symbol
;
306 if (SYMBOL_OBJFILE_OWNED (symbol
)
307 && symbol_symtab (symbol
) != NULL
)
309 struct objfile
*objfile
= symbol_objfile (symbol
);
311 obj
->next
= ((struct sympy_symbol_object
*)
312 objfile_data (objfile
, sympy_objfile_data_key
));
314 obj
->next
->prev
= obj
;
315 set_objfile_data (objfile
, sympy_objfile_data_key
, obj
);
321 /* Create a new symbol object (gdb.Symbol) that encapsulates the struct
322 symbol object from GDB. */
324 symbol_to_symbol_object (struct symbol
*sym
)
326 symbol_object
*sym_obj
;
328 sym_obj
= PyObject_New (symbol_object
, &symbol_object_type
);
330 set_symbol (sym_obj
, sym
);
332 return (PyObject
*) sym_obj
;
335 /* Return the symbol that is wrapped by this symbol object. */
337 symbol_object_to_symbol (PyObject
*obj
)
339 if (! PyObject_TypeCheck (obj
, &symbol_object_type
))
341 return ((symbol_object
*) obj
)->symbol
;
345 sympy_dealloc (PyObject
*obj
)
347 symbol_object
*sym_obj
= (symbol_object
*) obj
;
350 sym_obj
->prev
->next
= sym_obj
->next
;
351 else if (sym_obj
->symbol
!= NULL
352 && SYMBOL_OBJFILE_OWNED (sym_obj
->symbol
)
353 && symbol_symtab (sym_obj
->symbol
) != NULL
)
355 set_objfile_data (symbol_objfile (sym_obj
->symbol
),
356 sympy_objfile_data_key
, sym_obj
->next
);
359 sym_obj
->next
->prev
= sym_obj
->prev
;
360 sym_obj
->symbol
= NULL
;
364 gdb.lookup_symbol (name [, block] [, domain]) -> (symbol, is_field_of_this)
365 A tuple with 2 elements is always returned. The first is the symbol
366 object or None, the second is a boolean with the value of
367 is_a_field_of_this (see comment in lookup_symbol_in_language). */
370 gdbpy_lookup_symbol (PyObject
*self
, PyObject
*args
, PyObject
*kw
)
372 int domain
= VAR_DOMAIN
;
373 struct field_of_this_result is_a_field_of_this
;
375 static char *keywords
[] = { "name", "block", "domain", NULL
};
376 struct symbol
*symbol
= NULL
;
377 PyObject
*block_obj
= NULL
, *ret_tuple
, *sym_obj
, *bool_obj
;
378 const struct block
*block
= NULL
;
380 if (! PyArg_ParseTupleAndKeywords (args
, kw
, "s|O!i", keywords
, &name
,
381 &block_object_type
, &block_obj
, &domain
))
385 block
= block_object_to_block (block_obj
);
388 struct frame_info
*selected_frame
;
392 selected_frame
= get_selected_frame (_("No frame selected."));
393 block
= get_frame_block (selected_frame
, NULL
);
395 CATCH (except
, RETURN_MASK_ALL
)
397 GDB_PY_HANDLE_EXCEPTION (except
);
404 symbol
= lookup_symbol (name
, block
, (domain_enum
) domain
,
405 &is_a_field_of_this
).symbol
;
407 CATCH (except
, RETURN_MASK_ALL
)
409 GDB_PY_HANDLE_EXCEPTION (except
);
413 ret_tuple
= PyTuple_New (2);
419 sym_obj
= symbol_to_symbol_object (symbol
);
422 Py_DECREF (ret_tuple
);
431 PyTuple_SET_ITEM (ret_tuple
, 0, sym_obj
);
433 bool_obj
= (is_a_field_of_this
.type
!= NULL
) ? Py_True
: Py_False
;
434 Py_INCREF (bool_obj
);
435 PyTuple_SET_ITEM (ret_tuple
, 1, bool_obj
);
441 gdb.lookup_global_symbol (name [, domain]) -> symbol or None. */
444 gdbpy_lookup_global_symbol (PyObject
*self
, PyObject
*args
, PyObject
*kw
)
446 int domain
= VAR_DOMAIN
;
448 static char *keywords
[] = { "name", "domain", NULL
};
449 struct symbol
*symbol
= NULL
;
452 if (! PyArg_ParseTupleAndKeywords (args
, kw
, "s|i", keywords
, &name
,
458 symbol
= lookup_global_symbol (name
, NULL
, (domain_enum
) domain
).symbol
;
460 CATCH (except
, RETURN_MASK_ALL
)
462 GDB_PY_HANDLE_EXCEPTION (except
);
468 sym_obj
= symbol_to_symbol_object (symbol
);
481 /* This function is called when an objfile is about to be freed.
482 Invalidate the symbol as further actions on the symbol would result
483 in bad data. All access to obj->symbol should be gated by
484 SYMPY_REQUIRE_VALID which will raise an exception on invalid
487 del_objfile_symbols (struct objfile
*objfile
, void *datum
)
489 symbol_object
*obj
= (symbol_object
*) datum
;
492 symbol_object
*next
= obj
->next
;
503 gdbpy_initialize_symbols (void)
505 if (PyType_Ready (&symbol_object_type
) < 0)
508 /* Register an objfile "free" callback so we can properly
509 invalidate symbol when an object file that is about to be
511 sympy_objfile_data_key
512 = register_objfile_data_with_cleanup (NULL
, del_objfile_symbols
);
514 if (PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_UNDEF", LOC_UNDEF
) < 0
515 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_CONST",
517 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_STATIC",
519 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_REGISTER",
521 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_ARG",
523 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_REF_ARG",
525 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_LOCAL",
527 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_TYPEDEF",
529 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_LABEL",
531 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_BLOCK",
533 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_CONST_BYTES",
535 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_UNRESOLVED",
537 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_OPTIMIZED_OUT",
538 LOC_OPTIMIZED_OUT
) < 0
539 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_COMPUTED",
541 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LOC_REGPARM_ADDR",
542 LOC_REGPARM_ADDR
) < 0
543 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_UNDEF_DOMAIN",
545 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_VAR_DOMAIN",
547 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_STRUCT_DOMAIN",
549 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_LABEL_DOMAIN",
551 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_VARIABLES_DOMAIN",
552 VARIABLES_DOMAIN
) < 0
553 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_FUNCTIONS_DOMAIN",
554 FUNCTIONS_DOMAIN
) < 0
555 || PyModule_AddIntConstant (gdb_module
, "SYMBOL_TYPES_DOMAIN",
559 return gdb_pymodule_addobject (gdb_module
, "Symbol",
560 (PyObject
*) &symbol_object_type
);
565 static PyGetSetDef symbol_object_getset
[] = {
566 { "type", sympy_get_type
, NULL
,
567 "Type of the symbol.", NULL
},
568 { "symtab", sympy_get_symtab
, NULL
,
569 "Symbol table in which the symbol appears.", NULL
},
570 { "name", sympy_get_name
, NULL
,
571 "Name of the symbol, as it appears in the source code.", NULL
},
572 { "linkage_name", sympy_get_linkage_name
, NULL
,
573 "Name of the symbol, as used by the linker (i.e., may be mangled).",
575 { "print_name", sympy_get_print_name
, NULL
,
576 "Name of the symbol in a form suitable for output.\n\
577 This is either name or linkage_name, depending on whether the user asked GDB\n\
578 to display demangled or mangled names.", NULL
},
579 { "addr_class", sympy_get_addr_class
, NULL
, "Address class of the symbol." },
580 { "is_argument", sympy_is_argument
, NULL
,
581 "True if the symbol is an argument of a function." },
582 { "is_constant", sympy_is_constant
, NULL
,
583 "True if the symbol is a constant." },
584 { "is_function", sympy_is_function
, NULL
,
585 "True if the symbol is a function or method." },
586 { "is_variable", sympy_is_variable
, NULL
,
587 "True if the symbol is a variable." },
588 { "needs_frame", sympy_needs_frame
, NULL
,
589 "True if the symbol requires a frame for evaluation." },
590 { "line", sympy_line
, NULL
,
591 "The source line number at which the symbol was defined." },
592 { NULL
} /* Sentinel */
595 static PyMethodDef symbol_object_methods
[] = {
596 { "is_valid", sympy_is_valid
, METH_NOARGS
,
597 "is_valid () -> Boolean.\n\
598 Return true if this symbol is valid, false if not." },
599 { "value", sympy_value
, METH_VARARGS
,
600 "value ([frame]) -> gdb.Value\n\
601 Return the value of the symbol." },
602 {NULL
} /* Sentinel */
605 PyTypeObject symbol_object_type
= {
606 PyVarObject_HEAD_INIT (NULL
, 0)
607 "gdb.Symbol", /*tp_name*/
608 sizeof (symbol_object
), /*tp_basicsize*/
610 sympy_dealloc
, /*tp_dealloc*/
617 0, /*tp_as_sequence*/
621 sympy_str
, /*tp_str*/
625 Py_TPFLAGS_DEFAULT
, /*tp_flags*/
626 "GDB symbol object", /*tp_doc */
629 0, /*tp_richcompare */
630 0, /*tp_weaklistoffset */
633 symbol_object_methods
, /*tp_methods */
635 symbol_object_getset
/*tp_getset */