gdb/python/py-infevents.c

   1 /* Python interface to inferior function events.
   2
   3    Copyright (C) 2013-2018 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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.
  11
  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.
  16
  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/>.  */
  19
  20 #include "defs.h"
  21 #include "py-event.h"
  22 #include "py-ref.h"
  23
  24 /* Construct either a gdb.InferiorCallPreEvent or a
  25    gdb.InferiorCallPostEvent. */
  26
  27 static gdbpy_ref<>
  28 create_inferior_call_event_object (inferior_call_kind flag, ptid_t ptid,
  29                                    CORE_ADDR addr)
  30 {
  31   gdbpy_ref<> event;
  32
  33   switch (flag)
  34     {
  35     case INFERIOR_CALL_PRE:
  36       event = create_event_object (&inferior_call_pre_event_object_type);
  37       break;
  38     case INFERIOR_CALL_POST:
  39       event = create_event_object (&inferior_call_post_event_object_type);
  40       break;
  41     default:
  42       gdb_assert_not_reached ("invalid inferior_call_kind");
  43     }
  44
  45   gdbpy_ref<> ptid_obj (gdbpy_create_ptid_object (ptid));
  46   if (ptid_obj == NULL)
  47     return NULL;
  48
  49   if (evpy_add_attribute (event.get (), "ptid", ptid_obj.get ()) < 0)
  50     return NULL;
  51
  52   gdbpy_ref<> addr_obj (PyLong_FromLongLong (addr));
  53   if (addr_obj == NULL)
  54     return NULL;
  55
  56   if (evpy_add_attribute (event.get (), "address", addr_obj.get ()) < 0)
  57     return NULL;
  58
  59   return event;
  60 }
  61
  62 /* Construct a gdb.RegisterChangedEvent containing the affected
  63    register number. */
  64
  65 static gdbpy_ref<>
  66 create_register_changed_event_object (struct frame_info *frame,
  67                                       int regnum)
  68 {
  69   gdbpy_ref<> event = create_event_object (&register_changed_event_object_type);
  70   if (event == NULL)
  71     return NULL;
  72
  73   gdbpy_ref<> frame_obj (frame_info_to_frame_object (frame));
  74   if (frame_obj == NULL)
  75     return NULL;
  76
  77   if (evpy_add_attribute (event.get (), "frame", frame_obj.get ()) < 0)
  78     return NULL;
  79
  80   gdbpy_ref<> regnum_obj (PyLong_FromLongLong (regnum));
  81   if (regnum_obj == NULL)
  82     return NULL;
  83
  84   if (evpy_add_attribute (event.get (), "regnum", regnum_obj.get ()) < 0)
  85     return NULL;
  86
  87   return event;
  88 }
  89
  90 /* Construct a gdb.MemoryChangedEvent describing the extent of the
  91    affected memory. */
  92
  93 static gdbpy_ref<>
  94 create_memory_changed_event_object (CORE_ADDR addr, ssize_t len)
  95 {
  96   gdbpy_ref<> event = create_event_object (&memory_changed_event_object_type);
  97
  98   if (event == NULL)
  99     return NULL;
 100
 101   gdbpy_ref<> addr_obj (PyLong_FromLongLong (addr));
 102   if (addr_obj == NULL)
 103     return NULL;
 104
 105   if (evpy_add_attribute (event.get (), "address", addr_obj.get ()) < 0)
 106     return NULL;
 107
 108   gdbpy_ref<> len_obj (PyLong_FromLong (len));
 109   if (len_obj == NULL)
 110     return NULL;
 111
 112   if (evpy_add_attribute (event.get (), "length", len_obj.get ()) < 0)
 113     return NULL;
 114
 115   return event;
 116 }
 117
 118 /* Callback function which notifies observers when an event occurs which
 119    calls a function in the inferior.
 120    This function will create a new Python inferior-call event object.
 121    Return -1 if emit fails.  */
 122
 123 int
 124 emit_inferior_call_event (inferior_call_kind flag, ptid_t thread,
 125                           CORE_ADDR addr)
 126 {
 127   if (evregpy_no_listeners_p (gdb_py_events.inferior_call))
 128     return 0;
 129
 130   gdbpy_ref<> event = create_inferior_call_event_object (flag, thread, addr);
 131   if (event != NULL)
 132     return evpy_emit_event (event.get (), gdb_py_events.inferior_call);
 133   return -1;
 134 }
 135
 136 /* Callback when memory is modified by the user.  This function will
 137    create a new Python memory changed event object. */
 138
 139 int
 140 emit_memory_changed_event (CORE_ADDR addr, ssize_t len)
 141 {
 142   if (evregpy_no_listeners_p (gdb_py_events.memory_changed))
 143     return 0;
 144
 145   gdbpy_ref<> event = create_memory_changed_event_object (addr, len);
 146   if (event != NULL)
 147     return evpy_emit_event (event.get (), gdb_py_events.memory_changed);
 148   return -1;
 149 }
 150
 151 /* Callback when a register is modified by the user.  This function
 152    will create a new Python register changed event object. */
 153
 154 int
 155 emit_register_changed_event (struct frame_info* frame, int regnum)
 156 {
 157   if (evregpy_no_listeners_p (gdb_py_events.register_changed))
 158     return 0;
 159
 160   gdbpy_ref<> event = create_register_changed_event_object (frame, regnum);
 161   if (event != NULL)
 162     return evpy_emit_event (event.get (), gdb_py_events.register_changed);
 163   return -1;
 164 }