mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
fa61a48db2
Result of:
...
$ search="GDB_PY_SET_HANDLE_EXCEPTION ("
$ replace="return gdbpy_handle_gdb_exception (-1, "
$ sed -i \
"s/$search/$replace/" \
gdb/python/*.c
...
Also remove the now unused GDB_PY_SET_HANDLE_EXCEPTION.
No functional changes.
Tested on x86_64-linux.
Approved-By: Tom Tromey <tom@tromey.com>
505 lines
14 KiB
C
505 lines
14 KiB
C
/* Python interface to finish breakpoints
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Copyright (C) 2011-2024 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 "top.h"
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#include "python-internal.h"
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#include "breakpoint.h"
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#include "frame.h"
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#include "gdbthread.h"
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#include "arch-utils.h"
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#include "language.h"
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#include "observable.h"
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#include "inferior.h"
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#include "block.h"
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#include "location.h"
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/* Function that is called when a Python finish bp is found out of scope. */
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static const char outofscope_func[] = "out_of_scope";
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/* struct implementing the gdb.FinishBreakpoint object by extending
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the gdb.Breakpoint class. */
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struct finish_breakpoint_object
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{
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/* gdb.Breakpoint base class. */
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gdbpy_breakpoint_object py_bp;
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/* gdb.Symbol object of the function finished by this breakpoint.
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nullptr if no debug information was available or return type was VOID. */
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PyObject *func_symbol;
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/* gdb.Value object of the function finished by this breakpoint.
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nullptr if no debug information was available or return type was VOID. */
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PyObject *function_value;
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/* When stopped at this FinishBreakpoint, gdb.Value object returned by
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the function; Py_None if the value is not computable; NULL if GDB is
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not stopped at a FinishBreakpoint. */
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PyObject *return_value;
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/* The initiating frame for this operation, used to decide when we have
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left this frame. */
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struct frame_id initiating_frame;
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};
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extern PyTypeObject finish_breakpoint_object_type
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CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("finish_breakpoint_object");
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/* Python function to get the 'return_value' attribute of
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FinishBreakpoint. */
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static PyObject *
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bpfinishpy_get_returnvalue (PyObject *self, void *closure)
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{
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struct finish_breakpoint_object *self_finishbp =
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(struct finish_breakpoint_object *) self;
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if (!self_finishbp->return_value)
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Py_RETURN_NONE;
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Py_INCREF (self_finishbp->return_value);
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return self_finishbp->return_value;
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}
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/* Deallocate FinishBreakpoint object. */
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static void
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bpfinishpy_dealloc (PyObject *self)
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{
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struct finish_breakpoint_object *self_bpfinish =
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(struct finish_breakpoint_object *) self;
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Py_XDECREF (self_bpfinish->func_symbol);
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Py_XDECREF (self_bpfinish->function_value);
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Py_XDECREF (self_bpfinish->return_value);
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Py_TYPE (self)->tp_free (self);
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}
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/* Triggered when gdbpy_breakpoint_cond_says_stop is about to execute the `stop'
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callback of the gdb.FinishBreakpoint object BP_OBJ. Will compute and cache
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the `return_value', if possible. */
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void
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bpfinishpy_pre_stop_hook (struct gdbpy_breakpoint_object *bp_obj)
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{
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struct finish_breakpoint_object *self_finishbp =
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(struct finish_breakpoint_object *) bp_obj;
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/* Can compute return_value only once. */
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gdb_assert (!self_finishbp->return_value);
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if (self_finishbp->func_symbol == nullptr)
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return;
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try
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{
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scoped_value_mark free_values;
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struct symbol *func_symbol =
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symbol_object_to_symbol (self_finishbp->func_symbol);
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struct value *function =
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value_object_to_value (self_finishbp->function_value);
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struct value *ret =
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get_return_value (func_symbol, function);
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if (ret)
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{
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self_finishbp->return_value = value_to_value_object (ret);
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if (!self_finishbp->return_value)
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gdbpy_print_stack ();
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}
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else
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{
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Py_INCREF (Py_None);
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self_finishbp->return_value = Py_None;
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}
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}
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catch (const gdb_exception &except)
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{
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gdbpy_convert_exception (except);
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gdbpy_print_stack ();
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}
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}
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/* Triggered when gdbpy_breakpoint_cond_says_stop has triggered the `stop'
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callback of the gdb.FinishBreakpoint object BP_OBJ. */
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void
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bpfinishpy_post_stop_hook (struct gdbpy_breakpoint_object *bp_obj)
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{
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try
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{
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/* Can't delete it here, but it will be removed at the next stop. */
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disable_breakpoint (bp_obj->bp);
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bp_obj->bp->disposition = disp_del_at_next_stop;
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}
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catch (const gdb_exception &except)
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{
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gdbpy_convert_exception (except);
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gdbpy_print_stack ();
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}
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}
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/* Python function to create a new breakpoint. */
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static int
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bpfinishpy_init (PyObject *self, PyObject *args, PyObject *kwargs)
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{
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static const char *keywords[] = { "frame", "internal", NULL };
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struct finish_breakpoint_object *self_bpfinish =
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(struct finish_breakpoint_object *) self;
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PyObject *frame_obj = NULL;
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int thread;
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frame_info_ptr frame = NULL; /* init for gcc -Wall */
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frame_info_ptr prev_frame = NULL;
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struct frame_id frame_id;
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PyObject *internal = NULL;
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int internal_bp = 0;
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CORE_ADDR pc;
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if (!gdb_PyArg_ParseTupleAndKeywords (args, kwargs, "|OO", keywords,
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&frame_obj, &internal))
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return -1;
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try
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{
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/* Default frame to newest frame if necessary. */
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if (frame_obj == NULL)
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frame = get_current_frame ();
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else
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frame = frame_object_to_frame_info (frame_obj);
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if (frame == NULL)
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{
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PyErr_SetString (PyExc_ValueError,
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_("Invalid ID for the `frame' object."));
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}
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else
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{
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prev_frame = get_prev_frame (frame);
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if (prev_frame == 0)
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{
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PyErr_SetString (PyExc_ValueError,
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_("\"FinishBreakpoint\" not "
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"meaningful in the outermost "
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"frame."));
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}
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else if (get_frame_type (prev_frame) == DUMMY_FRAME)
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{
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PyErr_SetString (PyExc_ValueError,
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_("\"FinishBreakpoint\" cannot "
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"be set on a dummy frame."));
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}
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else
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/* Get the real calling frame ID, ignoring inline frames. */
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frame_id = frame_unwind_caller_id (frame);
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}
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}
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catch (const gdb_exception &except)
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{
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return gdbpy_handle_gdb_exception (-1, except);
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}
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if (PyErr_Occurred ())
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return -1;
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if (inferior_ptid == null_ptid)
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{
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PyErr_SetString (PyExc_ValueError,
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_("No thread currently selected."));
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return -1;
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}
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thread = inferior_thread ()->global_num;
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if (internal)
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{
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internal_bp = PyObject_IsTrue (internal);
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if (internal_bp == -1)
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{
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PyErr_SetString (PyExc_ValueError,
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_("The value of `internal' must be a boolean."));
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return -1;
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}
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}
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/* Find the function we will return from. */
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self_bpfinish->func_symbol = nullptr;
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self_bpfinish->function_value = nullptr;
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try
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{
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if (get_frame_pc_if_available (frame, &pc))
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{
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struct symbol *function = find_pc_function (pc);
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if (function != nullptr)
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{
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struct type *ret_type =
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check_typedef (function->type ()->target_type ());
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/* Remember only non-void return types. */
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if (ret_type->code () != TYPE_CODE_VOID)
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{
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scoped_value_mark free_values;
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/* Ignore Python errors at this stage. */
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value *func_value = read_var_value (function, NULL, frame);
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self_bpfinish->function_value
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= value_to_value_object (func_value);
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PyErr_Clear ();
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self_bpfinish->func_symbol
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= symbol_to_symbol_object (function);
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PyErr_Clear ();
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}
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}
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}
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}
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catch (const gdb_exception_forced_quit &except)
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{
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quit_force (NULL, 0);
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}
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catch (const gdb_exception &except)
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{
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/* Just swallow. Either the return type or the function value
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remain NULL. */
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}
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if (self_bpfinish->func_symbol == nullptr
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|| self_bpfinish->function_value == nullptr)
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{
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/* Won't be able to compute return value. */
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Py_XDECREF (self_bpfinish->func_symbol);
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Py_XDECREF (self_bpfinish->function_value);
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self_bpfinish->func_symbol = nullptr;
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self_bpfinish->function_value = nullptr;
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}
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bppy_pending_object = &self_bpfinish->py_bp;
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bppy_pending_object->number = -1;
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bppy_pending_object->bp = NULL;
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try
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{
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/* Set a breakpoint on the return address. */
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location_spec_up locspec
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= new_address_location_spec (get_frame_pc (prev_frame), NULL, 0);
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create_breakpoint (gdbpy_enter::get_gdbarch (),
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locspec.get (), NULL, thread, -1, NULL, false,
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0,
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1 /*temp_flag*/,
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bp_breakpoint,
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0,
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AUTO_BOOLEAN_TRUE,
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&code_breakpoint_ops,
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0, 1, internal_bp, 0);
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}
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catch (const gdb_exception &except)
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{
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return gdbpy_handle_gdb_exception (-1, except);
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}
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self_bpfinish->py_bp.bp->frame_id = frame_id;
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self_bpfinish->py_bp.is_finish_bp = 1;
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self_bpfinish->initiating_frame = get_frame_id (frame);
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/* Bind the breakpoint with the current program space. */
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self_bpfinish->py_bp.bp->pspace = current_program_space;
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return 0;
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}
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/* Called when GDB notices that the finish breakpoint BP_OBJ is out of
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the current callstack. Triggers the method OUT_OF_SCOPE if implemented,
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then delete the breakpoint. */
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static void
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bpfinishpy_out_of_scope (struct finish_breakpoint_object *bpfinish_obj)
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{
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gdbpy_breakpoint_object *bp_obj = (gdbpy_breakpoint_object *) bpfinish_obj;
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PyObject *py_obj = (PyObject *) bp_obj;
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if (bpfinish_obj->py_bp.bp->enable_state == bp_enabled
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&& PyObject_HasAttrString (py_obj, outofscope_func))
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{
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gdbpy_ref<> meth_result = gdbpy_call_method (py_obj, outofscope_func);
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if (meth_result == NULL)
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gdbpy_print_stack ();
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}
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}
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/* Callback for `bpfinishpy_detect_out_scope'. Triggers Python's
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`B->out_of_scope' function if B is a FinishBreakpoint out of its scope.
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When DELETE_BP is true then breakpoint B will be deleted if B is a
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FinishBreakpoint and it is out of scope, otherwise B will not be
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deleted. */
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static void
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bpfinishpy_detect_out_scope_cb (struct breakpoint *b,
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struct breakpoint *bp_stopped,
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bool delete_bp)
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{
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PyObject *py_bp = (PyObject *) b->py_bp_object;
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/* Trigger out_of_scope if this is a FinishBreakpoint and its frame is
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not anymore in the current callstack. */
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if (py_bp != NULL && b->py_bp_object->is_finish_bp)
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{
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struct finish_breakpoint_object *finish_bp =
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(struct finish_breakpoint_object *) py_bp;
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/* Check scope if not currently stopped at the FinishBreakpoint. */
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if (b != bp_stopped)
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{
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try
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{
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struct frame_id initiating_frame = finish_bp->initiating_frame;
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if (b->pspace == current_inferior ()->pspace
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&& (!target_has_registers ()
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|| frame_find_by_id (initiating_frame) == NULL))
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{
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bpfinishpy_out_of_scope (finish_bp);
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if (delete_bp)
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delete_breakpoint (finish_bp->py_bp.bp);
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}
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}
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catch (const gdb_exception &except)
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{
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gdbpy_convert_exception (except);
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gdbpy_print_stack ();
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}
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}
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}
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}
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/* Called when gdbpy_breakpoint_deleted is about to delete a breakpoint. A
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chance to trigger the out_of_scope callback (if appropriate) for the
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associated Python object. */
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void
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bpfinishpy_pre_delete_hook (struct gdbpy_breakpoint_object *bp_obj)
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{
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breakpoint *bp = bp_obj->bp;
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bpfinishpy_detect_out_scope_cb (bp, nullptr, false);
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}
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/* Attached to `stop' notifications, check if the execution has run
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out of the scope of any FinishBreakpoint before it has been hit. */
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static void
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bpfinishpy_handle_stop (struct bpstat *bs, int print_frame)
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{
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gdbpy_enter enter_py;
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for (breakpoint &bp : all_breakpoints_safe ())
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bpfinishpy_detect_out_scope_cb
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(&bp, bs == NULL ? NULL : bs->breakpoint_at, true);
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}
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/* Attached to `exit' notifications, triggers all the necessary out of
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scope notifications. */
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static void
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bpfinishpy_handle_exit (struct inferior *inf)
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{
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gdbpy_enter enter_py (current_inferior ()->arch ());
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for (breakpoint &bp : all_breakpoints_safe ())
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bpfinishpy_detect_out_scope_cb (&bp, nullptr, true);
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}
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/* Initialize the Python finish breakpoint code. */
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static int CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION
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gdbpy_initialize_finishbreakpoints (void)
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{
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if (!gdbpy_breakpoint_init_breakpoint_type ())
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return -1;
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if (gdbpy_type_ready (&finish_breakpoint_object_type) < 0)
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return -1;
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gdb::observers::normal_stop.attach (bpfinishpy_handle_stop,
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"py-finishbreakpoint");
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gdb::observers::inferior_exit.attach (bpfinishpy_handle_exit,
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"py-finishbreakpoint");
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return 0;
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}
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GDBPY_INITIALIZE_FILE (gdbpy_initialize_finishbreakpoints);
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static gdb_PyGetSetDef finish_breakpoint_object_getset[] = {
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{ "return_value", bpfinishpy_get_returnvalue, NULL,
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"gdb.Value object representing the return value, if any. \
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None otherwise.", NULL },
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{ NULL } /* Sentinel. */
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};
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PyTypeObject finish_breakpoint_object_type =
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{
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PyVarObject_HEAD_INIT (NULL, 0)
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"gdb.FinishBreakpoint", /*tp_name*/
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sizeof (struct finish_breakpoint_object), /*tp_basicsize*/
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0, /*tp_itemsize*/
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bpfinishpy_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash */
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro */
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
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"GDB finish breakpoint object", /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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finish_breakpoint_object_getset,/* tp_getset */
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&breakpoint_object_type, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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bpfinishpy_init, /* tp_init */
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0, /* tp_alloc */
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0 /* tp_new */
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};
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