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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [python/] [py-frame.c] - Rev 602
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/* Python interface to stack frames Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "charset.h" #include "block.h" #include "frame.h" #include "exceptions.h" #include "symtab.h" #include "stack.h" #include "value.h" #include "python-internal.h" typedef struct { PyObject_HEAD struct frame_id frame_id; struct gdbarch *gdbarch; /* Marks that the FRAME_ID member actually holds the ID of the frame next to this, and not this frames' ID itself. This is a hack to permit Python frame objects which represent invalid frames (i.e., the last frame_info in a corrupt stack). The problem arises from the fact that this code relies on FRAME_ID to uniquely identify a frame, which is not always true for the last "frame" in a corrupt stack (it can have a null ID, or the same ID as the previous frame). Whenever get_prev_frame returns NULL, we record the frame_id of the next frame and set FRAME_ID_IS_NEXT to 1. */ int frame_id_is_next; } frame_object; /* Require a valid frame. This must be called inside a TRY_CATCH, or another context in which a gdb exception is allowed. */ #define FRAPY_REQUIRE_VALID(frame_obj, frame) \ do { \ frame = frame_object_to_frame_info (frame_obj); \ if (frame == NULL) \ error ("Frame is invalid."); \ } while (0) static PyTypeObject frame_object_type; /* Returns the frame_info object corresponding to the given Python Frame object. If the frame doesn't exist anymore (the frame id doesn't correspond to any frame in the inferior), returns NULL. */ static struct frame_info * frame_object_to_frame_info (frame_object *frame_obj) { struct frame_info *frame; frame = frame_find_by_id (frame_obj->frame_id); if (frame == NULL) return NULL; if (frame_obj->frame_id_is_next) frame = get_prev_frame (frame); return frame; } /* Called by the Python interpreter to obtain string representation of the object. */ static PyObject * frapy_str (PyObject *self) { char *s; PyObject *result; struct ui_file *strfile; strfile = mem_fileopen (); fprint_frame_id (strfile, ((frame_object *) self)->frame_id); s = ui_file_xstrdup (strfile, NULL); result = PyString_FromString (s); xfree (s); return result; } /* Implementation of gdb.Frame.is_valid (self) -> Boolean. Returns True if the frame corresponding to the frame_id of this object still exists in the inferior. */ static PyObject * frapy_is_valid (PyObject *self, PyObject *args) { struct frame_info *frame; frame = frame_object_to_frame_info ((frame_object *) self); if (frame == NULL) Py_RETURN_FALSE; Py_RETURN_TRUE; } /* Implementation of gdb.Frame.name (self) -> String. Returns the name of the function corresponding to this frame. */ static PyObject * frapy_name (PyObject *self, PyObject *args) { struct frame_info *frame; char *name; enum language lang; PyObject *result; volatile struct gdb_exception except; TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); find_frame_funname (frame, &name, &lang); } GDB_PY_HANDLE_EXCEPTION (except); if (name) result = PyUnicode_Decode (name, strlen (name), host_charset (), NULL); else { result = Py_None; Py_INCREF (Py_None); } return result; } /* Implementation of gdb.Frame.type (self) -> Integer. Returns the frame type, namely one of the gdb.*_FRAME constants. */ static PyObject * frapy_type (PyObject *self, PyObject *args) { struct frame_info *frame; enum frame_type type = NORMAL_FRAME;/* Initialize to appease gcc warning. */ volatile struct gdb_exception except; TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); type = get_frame_type (frame); } GDB_PY_HANDLE_EXCEPTION (except); return PyInt_FromLong (type); } /* Implementation of gdb.Frame.unwind_stop_reason (self) -> Integer. Returns one of the gdb.FRAME_UNWIND_* constants. */ static PyObject * frapy_unwind_stop_reason (PyObject *self, PyObject *args) { struct frame_info *frame = NULL; /* Initialize to appease gcc warning. */ volatile struct gdb_exception except; enum unwind_stop_reason stop_reason; TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); } GDB_PY_HANDLE_EXCEPTION (except); stop_reason = get_frame_unwind_stop_reason (frame); return PyInt_FromLong (stop_reason); } /* Implementation of gdb.Frame.pc (self) -> Long. Returns the frame's resume address. */ static PyObject * frapy_pc (PyObject *self, PyObject *args) { CORE_ADDR pc = 0; /* Initialize to appease gcc warning. */ struct frame_info *frame; volatile struct gdb_exception except; TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); pc = get_frame_pc (frame); } GDB_PY_HANDLE_EXCEPTION (except); return PyLong_FromUnsignedLongLong (pc); } /* Convert a frame_info struct to a Python Frame object. Sets a Python exception and returns NULL on error. */ static frame_object * frame_info_to_frame_object (struct frame_info *frame) { frame_object *frame_obj; frame_obj = PyObject_New (frame_object, &frame_object_type); if (frame_obj == NULL) { PyErr_SetString (PyExc_MemoryError, "Could not allocate frame object."); return NULL; } /* Try to get the previous frame, to determine if this is the last frame in a corrupt stack. If so, we need to store the frame_id of the next frame and not of this one (which is possibly invalid). */ if (get_prev_frame (frame) == NULL && get_frame_unwind_stop_reason (frame) != UNWIND_NO_REASON && get_next_frame (frame) != NULL) { frame_obj->frame_id = get_frame_id (get_next_frame (frame)); frame_obj->frame_id_is_next = 1; } else { frame_obj->frame_id = get_frame_id (frame); frame_obj->frame_id_is_next = 0; } frame_obj->gdbarch = get_frame_arch (frame); return frame_obj; } /* Implementation of gdb.Frame.older (self) -> gdb.Frame. Returns the frame immediately older (outer) to this frame, or None if there isn't one. */ static PyObject * frapy_older (PyObject *self, PyObject *args) { struct frame_info *frame, *prev; volatile struct gdb_exception except; PyObject *prev_obj = NULL; /* Initialize to appease gcc warning. */ TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); prev = get_prev_frame (frame); if (prev) prev_obj = (PyObject *) frame_info_to_frame_object (prev); else { Py_INCREF (Py_None); prev_obj = Py_None; } } GDB_PY_HANDLE_EXCEPTION (except); return prev_obj; } /* Implementation of gdb.Frame.newer (self) -> gdb.Frame. Returns the frame immediately newer (inner) to this frame, or None if there isn't one. */ static PyObject * frapy_newer (PyObject *self, PyObject *args) { struct frame_info *frame, *next; volatile struct gdb_exception except; PyObject *next_obj = NULL; /* Initialize to appease gcc warning. */ TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); next = get_next_frame (frame); if (next) next_obj = (PyObject *) frame_info_to_frame_object (next); else { Py_INCREF (Py_None); next_obj = Py_None; } } GDB_PY_HANDLE_EXCEPTION (except); return next_obj; } /* Implementation of gdb.Frame.read_var_value (self, variable) -> gdb.Value. Returns the value of the given variable in this frame. The argument must be a string. Returns None if GDB can't find the specified variable. */ static PyObject * frapy_read_var (PyObject *self, PyObject *args) { struct frame_info *frame; PyObject *sym_obj; struct symbol *var = NULL; /* gcc-4.3.2 false warning. */ struct value *val = NULL; volatile struct gdb_exception except; if (!PyArg_ParseTuple (args, "O", &sym_obj)) return NULL; if (gdbpy_is_string (sym_obj)) { char *var_name; struct block *block = NULL; struct cleanup *cleanup; volatile struct gdb_exception except; var_name = python_string_to_target_string (sym_obj); if (!var_name) return NULL; cleanup = make_cleanup (xfree, var_name); TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); block = block_for_pc (get_frame_address_in_block (frame)); var = lookup_symbol (var_name, block, VAR_DOMAIN, NULL); } GDB_PY_HANDLE_EXCEPTION (except); if (!var) { PyErr_Format (PyExc_ValueError, _("variable '%s' not found"), var_name); do_cleanups (cleanup); return NULL; } do_cleanups (cleanup); } else { PyErr_SetString (PyExc_TypeError, _("argument must be a symbol or string")); return NULL; } TRY_CATCH (except, RETURN_MASK_ALL) { FRAPY_REQUIRE_VALID ((frame_object *) self, frame); val = read_var_value (var, frame); } GDB_PY_HANDLE_EXCEPTION (except); if (val) return value_to_value_object (val); Py_RETURN_NONE; } /* Implementation of gdb.selected_frame () -> gdb.Frame. Returns the selected frame object. */ PyObject * gdbpy_selected_frame (PyObject *self, PyObject *args) { struct frame_info *frame; frame_object *frame_obj = NULL; /* Initialize to appease gcc warning. */ volatile struct gdb_exception except; TRY_CATCH (except, RETURN_MASK_ALL) { frame = get_selected_frame ("No frame is currently selected."); frame_obj = frame_info_to_frame_object (frame); } GDB_PY_HANDLE_EXCEPTION (except); return (PyObject *) frame_obj; } /* Implementation of gdb.stop_reason_string (Integer) -> String. Return a string explaining the unwind stop reason. */ PyObject * gdbpy_frame_stop_reason_string (PyObject *self, PyObject *args) { int reason; const char *str; if (!PyArg_ParseTuple (args, "i", &reason)) return NULL; if (reason < 0 || reason > UNWIND_NO_SAVED_PC) { PyErr_SetString (PyExc_ValueError, "Invalid frame stop reason."); return NULL; } str = frame_stop_reason_string (reason); return PyUnicode_Decode (str, strlen (str), host_charset (), NULL); } /* Implements the equality comparison for Frame objects. All other comparison operators will throw a TypeError Python exception, as they aren't valid for frames. */ static PyObject * frapy_richcompare (PyObject *self, PyObject *other, int op) { int result; if (!PyObject_TypeCheck (other, &frame_object_type) || (op != Py_EQ && op != Py_NE)) { Py_INCREF (Py_NotImplemented); return Py_NotImplemented; } if (frame_id_eq (((frame_object *) self)->frame_id, ((frame_object *) other)->frame_id)) result = Py_EQ; else result = Py_NE; if (op == result) Py_RETURN_TRUE; Py_RETURN_FALSE; } /* Sets up the Frame API in the gdb module. */ void gdbpy_initialize_frames (void) { if (PyType_Ready (&frame_object_type) < 0) return; /* Note: These would probably be best exposed as class attributes of Frame, but I don't know how to do it except by messing with the type's dictionary. That seems too messy. */ PyModule_AddIntConstant (gdb_module, "NORMAL_FRAME", NORMAL_FRAME); PyModule_AddIntConstant (gdb_module, "DUMMY_FRAME", DUMMY_FRAME); PyModule_AddIntConstant (gdb_module, "SIGTRAMP_FRAME", SIGTRAMP_FRAME); PyModule_AddIntConstant (gdb_module, "SENTINEL_FRAME", SENTINEL_FRAME); PyModule_AddIntConstant (gdb_module, "FRAME_UNWIND_NO_REASON", UNWIND_NO_REASON); PyModule_AddIntConstant (gdb_module, "FRAME_UNWIND_NULL_ID", UNWIND_NULL_ID); PyModule_AddIntConstant (gdb_module, "FRAME_UNWIND_FIRST_ERROR", UNWIND_FIRST_ERROR); PyModule_AddIntConstant (gdb_module, "FRAME_UNWIND_INNER_ID", UNWIND_INNER_ID); PyModule_AddIntConstant (gdb_module, "FRAME_UNWIND_SAME_ID", UNWIND_SAME_ID); PyModule_AddIntConstant (gdb_module, "FRAME_UNWIND_NO_SAVED_PC", UNWIND_NO_SAVED_PC); Py_INCREF (&frame_object_type); PyModule_AddObject (gdb_module, "Frame", (PyObject *) &frame_object_type); } static PyMethodDef frame_object_methods[] = { { "is_valid", frapy_is_valid, METH_NOARGS, "is_valid () -> Boolean.\n\ Return true if this frame is valid, false if not." }, { "name", frapy_name, METH_NOARGS, "name () -> String.\n\ Return the function name of the frame, or None if it can't be determined." }, { "type", frapy_type, METH_NOARGS, "type () -> Integer.\n\ Return the type of the frame." }, { "unwind_stop_reason", frapy_unwind_stop_reason, METH_NOARGS, "unwind_stop_reason () -> Integer.\n\ Return the reason why it's not possible to find frames older than this." }, { "pc", frapy_pc, METH_NOARGS, "pc () -> Long.\n\ Return the frame's resume address." }, { "older", frapy_older, METH_NOARGS, "older () -> gdb.Frame.\n\ Return the frame that called this frame." }, { "newer", frapy_newer, METH_NOARGS, "newer () -> gdb.Frame.\n\ Return the frame called by this frame." }, { "read_var", frapy_read_var, METH_VARARGS, "read_var (variable) -> gdb.Value.\n\ Return the value of the variable in this frame." }, {NULL} /* Sentinel */ }; static PyTypeObject frame_object_type = { PyObject_HEAD_INIT (NULL) 0, /* ob_size */ "gdb.Frame", /* tp_name */ sizeof (frame_object), /* tp_basicsize */ 0, /* tp_itemsize */ 0, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_compare */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ frapy_str, /* tp_str */ 0, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT, /* tp_flags */ "GDB frame object", /* tp_doc */ 0, /* tp_traverse */ 0, /* tp_clear */ frapy_richcompare, /* tp_richcompare */ 0, /* tp_weaklistoffset */ 0, /* tp_iter */ 0, /* tp_iternext */ frame_object_methods, /* tp_methods */ 0, /* tp_members */ 0, /* 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 */ PyType_GenericNew /* tp_new */ };
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