gdb/jit.h

   1 /* JIT declarations for GDB, the GNU Debugger.
   2
   3    Copyright (C) 2009-2019 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 #ifndef JIT_H
  21 #define JIT_H
  22
  23 /* When the JIT breakpoint fires, the inferior wants us to take one of
  24    these actions.  These values are used by the inferior, so the
  25    values of these enums cannot be changed.  */
  26
  27 typedef enum
  28 {
  29   JIT_NOACTION = 0,
  30   JIT_REGISTER,
  31   JIT_UNREGISTER
  32 } jit_actions_t;
  33
  34 /* This struct describes a single symbol file in a linked list of
  35    symbol files describing generated code.  As the inferior generates
  36    code, it adds these entries to the list, and when we attach to the
  37    inferior, we read them all.  For the first element prev_entry
  38    should be NULL, and for the last element next_entry should be
  39    NULL.  */
  40
  41 struct jit_code_entry
  42 {
  43   CORE_ADDR next_entry;
  44   CORE_ADDR prev_entry;
  45   CORE_ADDR symfile_addr;
  46   ULONGEST symfile_size;
  47 };
  48
  49 /* This is the global descriptor that the inferior uses to communicate
  50    information to the debugger.  To alert the debugger to take an
  51    action, the inferior sets the action_flag to the appropriate enum
  52    value, updates relevant_entry to point to the relevant code entry,
  53    and calls the function at the well-known symbol with our
  54    breakpoint.  We then read this descriptor from another global
  55    well-known symbol.  */
  56
  57 struct jit_descriptor
  58 {
  59   uint32_t version;
  60   /* This should be jit_actions_t, but we want to be specific about the
  61      bit-width.  */
  62   uint32_t action_flag;
  63   CORE_ADDR relevant_entry;
  64   CORE_ADDR first_entry;
  65 };
  66
  67 /* Looks for the descriptor and registration symbols and breakpoints
  68    the registration function.  If it finds both, it registers all the
  69    already JITed code.  If it has already found the symbols, then it
  70    doesn't try again.  */
  71
  72 extern void jit_inferior_created_hook (void);
  73
  74 /* Re-establish the jit breakpoint(s).  */
  75
  76 extern void jit_breakpoint_re_set (void);
  77
  78 /* This function is called by handle_inferior_event when it decides
  79    that the JIT event breakpoint has fired.  */
  80
  81 extern void jit_event_handler (struct gdbarch *gdbarch);
  82
  83 #endif /* JIT_H */