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- /* Python interface to stack frames
- Copyright (C) 2008-2022 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 "symtab.h"
- #include "stack.h"
- #include "value.h"
- #include "python-internal.h"
- #include "symfile.h"
- #include "objfiles.h"
- struct frame_object {
- 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;
- };
- /* 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)
- /* 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. */
- struct frame_info *
- frame_object_to_frame_info (PyObject *obj)
- {
- frame_object *frame_obj = (frame_object *) 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)
- {
- const frame_id &fid = ((frame_object *) self)->frame_id;
- return PyUnicode_FromString (fid.to_string ().c_str ());
- }
- /* 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 = NULL;
- try
- {
- frame = frame_object_to_frame_info (self);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- 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;
- gdb::unique_xmalloc_ptr<char> name;
- enum language lang;
- PyObject *result;
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- name = find_frame_funname (frame, &lang, NULL);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- if (name)
- {
- result = PyUnicode_Decode (name.get (), strlen (name.get ()),
- 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. */
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- type = get_frame_type (frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return gdb_py_object_from_longest (type).release ();
- }
- /* Implementation of gdb.Frame.architecture (self) -> gdb.Architecture.
- Returns the frame's architecture as a gdb.Architecture object. */
- static PyObject *
- frapy_arch (PyObject *self, PyObject *args)
- {
- struct frame_info *frame = NULL; /* Initialize to appease gcc warning. */
- frame_object *obj = (frame_object *) self;
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return gdbarch_to_arch_object (obj->gdbarch);
- }
- /* 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. */
- enum unwind_stop_reason stop_reason;
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- stop_reason = get_frame_unwind_stop_reason (frame);
- return gdb_py_object_from_longest (stop_reason).release ();
- }
- /* 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;
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- pc = get_frame_pc (frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return gdb_py_object_from_ulongest (pc).release ();
- }
- /* Implementation of gdb.Frame.read_register (self, register) -> gdb.Value.
- Returns the value of a register in this frame. */
- static PyObject *
- frapy_read_register (PyObject *self, PyObject *args)
- {
- PyObject *pyo_reg_id;
- struct value *val = NULL;
- if (!PyArg_UnpackTuple (args, "read_register", 1, 1, &pyo_reg_id))
- return NULL;
- try
- {
- struct frame_info *frame;
- int regnum;
- FRAPY_REQUIRE_VALID (self, frame);
- if (!gdbpy_parse_register_id (get_frame_arch (frame), pyo_reg_id,
- ®num))
- {
- PyErr_SetString (PyExc_ValueError, "Bad register");
- return NULL;
- }
- gdb_assert (regnum >= 0);
- val = value_of_register (regnum, frame);
- if (val == NULL)
- PyErr_SetString (PyExc_ValueError, _("Can't read register."));
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return val == NULL ? NULL : value_to_value_object (val);
- }
- /* Implementation of gdb.Frame.block (self) -> gdb.Block.
- Returns the frame's code block. */
- static PyObject *
- frapy_block (PyObject *self, PyObject *args)
- {
- struct frame_info *frame;
- const struct block *block = NULL, *fn_block;
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- block = get_frame_block (frame, NULL);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- for (fn_block = block;
- fn_block != NULL && BLOCK_FUNCTION (fn_block) == NULL;
- fn_block = BLOCK_SUPERBLOCK (fn_block))
- ;
- if (block == NULL || fn_block == NULL || BLOCK_FUNCTION (fn_block) == NULL)
- {
- PyErr_SetString (PyExc_RuntimeError,
- _("Cannot locate block for frame."));
- return NULL;
- }
- if (block)
- {
- return block_to_block_object
- (block, symbol_objfile (BLOCK_FUNCTION (fn_block)));
- }
- Py_RETURN_NONE;
- }
- /* Implementation of gdb.Frame.function (self) -> gdb.Symbol.
- Returns the symbol for the function corresponding to this frame. */
- static PyObject *
- frapy_function (PyObject *self, PyObject *args)
- {
- struct symbol *sym = NULL;
- struct frame_info *frame;
- try
- {
- enum language funlang;
- FRAPY_REQUIRE_VALID (self, frame);
- gdb::unique_xmalloc_ptr<char> funname
- = find_frame_funname (frame, &funlang, &sym);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- if (sym)
- return symbol_to_symbol_object (sym);
- Py_RETURN_NONE;
- }
- /* Convert a frame_info struct to a Python Frame object.
- Sets a Python exception and returns NULL on error. */
- PyObject *
- frame_info_to_frame_object (struct frame_info *frame)
- {
- gdbpy_ref<frame_object> frame_obj (PyObject_New (frame_object,
- &frame_object_type));
- if (frame_obj == NULL)
- return NULL;
- try
- {
- /* 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);
- }
- catch (const gdb_exception &except)
- {
- gdbpy_convert_exception (except);
- return NULL;
- }
- return (PyObject *) frame_obj.release ();
- }
- /* 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 = NULL;
- PyObject *prev_obj = NULL; /* Initialize to appease gcc warning. */
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- prev = get_prev_frame (frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- if (prev)
- prev_obj = frame_info_to_frame_object (prev);
- else
- {
- Py_INCREF (Py_None);
- prev_obj = Py_None;
- }
- 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 = NULL;
- PyObject *next_obj = NULL; /* Initialize to appease gcc warning. */
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- next = get_next_frame (frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- if (next)
- next_obj = frame_info_to_frame_object (next);
- else
- {
- Py_INCREF (Py_None);
- next_obj = Py_None;
- }
- return next_obj;
- }
- /* Implementation of gdb.Frame.find_sal (self) -> gdb.Symtab_and_line.
- Returns the frame's symtab and line. */
- static PyObject *
- frapy_find_sal (PyObject *self, PyObject *args)
- {
- struct frame_info *frame;
- PyObject *sal_obj = NULL; /* Initialize to appease gcc warning. */
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- symtab_and_line sal = find_frame_sal (frame);
- sal_obj = symtab_and_line_to_sal_object (sal);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return sal_obj;
- }
- /* Implementation of gdb.Frame.read_var_value (self, variable,
- [block]) -> gdb.Value. If the optional block argument is provided
- start the search from that block, otherwise search from the frame's
- current block (determined by examining the resume address of the
- frame). The variable argument must be a string or an instance of a
- gdb.Symbol. The block argument must be an instance of gdb.Block. Returns
- NULL on error, with a python exception set. */
- static PyObject *
- frapy_read_var (PyObject *self, PyObject *args)
- {
- struct frame_info *frame;
- PyObject *sym_obj, *block_obj = NULL;
- struct symbol *var = NULL; /* gcc-4.3.2 false warning. */
- const struct block *block = NULL;
- struct value *val = NULL;
- if (!PyArg_ParseTuple (args, "O|O", &sym_obj, &block_obj))
- return NULL;
- if (PyObject_TypeCheck (sym_obj, &symbol_object_type))
- var = symbol_object_to_symbol (sym_obj);
- else if (gdbpy_is_string (sym_obj))
- {
- gdb::unique_xmalloc_ptr<char>
- var_name (python_string_to_target_string (sym_obj));
- if (!var_name)
- return NULL;
- if (block_obj)
- {
- block = block_object_to_block (block_obj);
- if (!block)
- {
- PyErr_SetString (PyExc_RuntimeError,
- _("Second argument must be block."));
- return NULL;
- }
- }
- try
- {
- struct block_symbol lookup_sym;
- FRAPY_REQUIRE_VALID (self, frame);
- if (!block)
- block = get_frame_block (frame, NULL);
- lookup_sym = lookup_symbol (var_name.get (), block, VAR_DOMAIN, NULL);
- var = lookup_sym.symbol;
- block = lookup_sym.block;
- }
- catch (const gdb_exception &except)
- {
- gdbpy_convert_exception (except);
- return NULL;
- }
- if (!var)
- {
- PyErr_Format (PyExc_ValueError,
- _("Variable '%s' not found."), var_name.get ());
- return NULL;
- }
- }
- else
- {
- PyErr_SetString (PyExc_TypeError,
- _("Argument must be a symbol or string."));
- return NULL;
- }
- try
- {
- FRAPY_REQUIRE_VALID (self, frame);
- val = read_var_value (var, block, frame);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return value_to_value_object (val);
- }
- /* Select this frame. */
- static PyObject *
- frapy_select (PyObject *self, PyObject *args)
- {
- struct frame_info *fi;
- try
- {
- FRAPY_REQUIRE_VALID (self, fi);
- select_frame (fi);
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- Py_RETURN_NONE;
- }
- /* The stack frame level for this frame. */
- static PyObject *
- frapy_level (PyObject *self, PyObject *args)
- {
- struct frame_info *fi;
- try
- {
- FRAPY_REQUIRE_VALID (self, fi);
- return gdb_py_object_from_longest (frame_relative_level (fi)).release ();
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- Py_RETURN_NONE;
- }
- /* Implementation of gdb.newest_frame () -> gdb.Frame.
- Returns the newest frame object. */
- PyObject *
- gdbpy_newest_frame (PyObject *self, PyObject *args)
- {
- struct frame_info *frame = NULL;
- try
- {
- frame = get_current_frame ();
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return frame_info_to_frame_object (frame);
- }
- /* Implementation of gdb.selected_frame () -> gdb.Frame.
- Returns the selected frame object. */
- PyObject *
- gdbpy_selected_frame (PyObject *self, PyObject *args)
- {
- struct frame_info *frame = NULL;
- try
- {
- frame = get_selected_frame ("No frame is currently selected.");
- }
- catch (const gdb_exception &except)
- {
- GDB_PY_HANDLE_EXCEPTION (except);
- }
- return frame_info_to_frame_object (frame);
- }
- /* 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 < UNWIND_FIRST || reason > UNWIND_LAST)
- {
- PyErr_SetString (PyExc_ValueError,
- _("Invalid frame stop reason."));
- return NULL;
- }
- str = unwind_stop_reason_to_string ((enum unwind_stop_reason) 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;
- }
- frame_object *self_frame = (frame_object *) self;
- frame_object *other_frame = (frame_object *) other;
- if (self_frame->frame_id_is_next == other_frame->frame_id_is_next
- && frame_id_eq (self_frame->frame_id, other_frame->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. */
- int
- gdbpy_initialize_frames (void)
- {
- frame_object_type.tp_new = PyType_GenericNew;
- if (PyType_Ready (&frame_object_type) < 0)
- return -1;
- /* 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. */
- if (PyModule_AddIntConstant (gdb_module, "NORMAL_FRAME", NORMAL_FRAME) < 0
- || PyModule_AddIntConstant (gdb_module, "DUMMY_FRAME", DUMMY_FRAME) < 0
- || PyModule_AddIntConstant (gdb_module, "INLINE_FRAME", INLINE_FRAME) < 0
- || PyModule_AddIntConstant (gdb_module, "TAILCALL_FRAME",
- TAILCALL_FRAME) < 0
- || PyModule_AddIntConstant (gdb_module, "SIGTRAMP_FRAME",
- SIGTRAMP_FRAME) < 0
- || PyModule_AddIntConstant (gdb_module, "ARCH_FRAME", ARCH_FRAME) < 0
- || PyModule_AddIntConstant (gdb_module, "SENTINEL_FRAME",
- SENTINEL_FRAME) < 0)
- return -1;
- #define SET(name, description) \
- if (PyModule_AddIntConstant (gdb_module, "FRAME_"#name, name) < 0) \
- return -1;
- #include "unwind_stop_reasons.def"
- #undef SET
- return gdb_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." },
- { "architecture", frapy_arch, METH_NOARGS,
- "architecture () -> gdb.Architecture.\n\
- Return the architecture 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." },
- { "read_register", frapy_read_register, METH_VARARGS,
- "read_register (register_name) -> gdb.Value\n\
- Return the value of the register in the frame." },
- { "block", frapy_block, METH_NOARGS,
- "block () -> gdb.Block.\n\
- Return the frame's code block." },
- { "function", frapy_function, METH_NOARGS,
- "function () -> gdb.Symbol.\n\
- Returns the symbol for the function corresponding to this frame." },
- { "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." },
- { "find_sal", frapy_find_sal, METH_NOARGS,
- "find_sal () -> gdb.Symtab_and_line.\n\
- Return the frame's symtab and line." },
- { "read_var", frapy_read_var, METH_VARARGS,
- "read_var (variable) -> gdb.Value.\n\
- Return the value of the variable in this frame." },
- { "select", frapy_select, METH_NOARGS,
- "Select this frame as the user's current frame." },
- { "level", frapy_level, METH_NOARGS,
- "The stack level of this frame." },
- {NULL} /* Sentinel */
- };
- PyTypeObject frame_object_type = {
- PyVarObject_HEAD_INIT (NULL, 0)
- "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 */
- };
|