gdb/interps.h

   1 /* Manages interpreters for GDB, the GNU debugger.
   2
   3    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   4
   5    Written by Jim Ingham <jingham@apple.com> of Apple Computer, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef INTERPS_H
  23 #define INTERPS_H
  24
  25 struct ui_out;
  26 struct interp;
  27 struct ui;
  28
  29 typedef struct interp *(*interp_factory_func) (const char *name);
  30
  31 /* Each interpreter kind (CLI, MI, etc.) registers itself with a call
  32    to this function, passing along its name, and a pointer to a
  33    function that creates a new instance of an interpreter with that
  34    name.  */
  35 extern void interp_factory_register (const char *name,
  36                                      interp_factory_func func);
  37
  38 extern int interp_resume (struct interp *interp);
  39 extern int interp_suspend (struct interp *interp);
  40 extern struct gdb_exception interp_exec (struct interp *interp,
  41                                          const char *command);
  42 extern int interp_quiet_p (struct interp *interp);
  43
  44 class interp
  45 {
  46 public:
  47   explicit interp (const char *name);
  48   virtual ~interp () = 0;
  49
  50   virtual void init (bool top_level)
  51   {}
  52
  53   virtual void resume () = 0;
  54   virtual void suspend () = 0;
  55
  56   virtual gdb_exception exec (const char *command) = 0;
  57
  58   /* Returns the ui_out currently used to collect results for this
  59      interpreter.  It can be a formatter for stdout, as is the case
  60      for the console & mi outputs, or it might be a result
  61      formatter.  */
  62   virtual ui_out *interp_ui_out () = 0;
  63
  64   /* Provides a hook for interpreters to do any additional
  65      setup/cleanup that they might need when logging is enabled or
  66      disabled.  */
  67   virtual void set_logging (ui_file_up logfile, bool logging_redirect) = 0;
  68
  69   /* Called before starting an event loop, to give the interpreter a
  70      chance to e.g., print a prompt.  */
  71   virtual void pre_command_loop ()
  72   {}
  73
  74   /* Returns true if this interpreter supports using the readline
  75      library; false if it uses GDB's own simplified readline
  76      emulation.  */
  77   virtual bool supports_command_editing ()
  78   { return false; }
  79
  80   /* This is the name in "-i=" and "set interpreter".  */
  81   const char *name;
  82
  83   /* Interpreters are stored in a linked list, this is the next
  84      one...  */
  85   struct interp *next;
  86
  87   /* Has the init method been run?  */
  88   bool inited;
  89
  90   bool quiet_p;
  91 };
  92
  93 extern void interp_add (struct ui *ui, struct interp *interp);
  94 extern void interp_set (struct interp *interp, bool top_level);
  95
  96 /* Look up the interpreter for NAME, creating one if none exists yet.
  97    If NAME is not a interpreter type previously registered with
  98    interp_factory_register, return NULL; otherwise return a pointer to
  99    the interpreter.  */
 100 extern struct interp *interp_lookup (struct ui *ui, const char *name);
 101
 102 /* Set the current UI's top level interpreter to the interpreter named
 103    NAME.  Throws an error if NAME is not a known interpreter or the
 104    interpreter fails to initialize.  */
 105 extern void set_top_level_interpreter (const char *name);
 106
 107 extern struct ui_out *interp_ui_out (struct interp *interp);
 108 extern const char *interp_name (struct interp *interp);
 109 extern struct interp *interp_set_temp (const char *name);
 110
 111 extern int current_interp_named_p (const char *name);
 112
 113 /* Call this function to give the current interpreter an opportunity
 114    to do any special handling of streams when logging is enabled or
 115    disabled.  LOGFILE is the stream for the log file when logging is
 116    starting and is NULL when logging is ending.  LOGGING_REDIRECT is
 117    the value of the "set logging redirect" setting.  If true, the
 118    interpreter should configure the output streams to send output only
 119    to the logfile.  If false, the interpreter should configure the
 120    output streams to send output to both the current output stream
 121    (i.e., the terminal) and the log file.  */
 122 extern void current_interp_set_logging (ui_file_up logfile,
 123                                         bool logging_redirect);
 124
 125 /* Returns the top-level interpreter.  */
 126 extern struct interp *top_level_interpreter (void);
 127
 128 /* Return the current UI's current interpreter.  */
 129 extern struct interp *current_interpreter (void);
 130
 131 extern struct interp *command_interp (void);
 132
 133 extern void clear_interpreter_hooks (void);
 134
 135 /* Returns true if INTERP supports using the readline library; false
 136    if it uses GDB's own simplified form of readline.  */
 137 extern int interp_supports_command_editing (struct interp *interp);
 138
 139 /* Called before starting an event loop, to give the interpreter a
 140    chance to e.g., print a prompt.  */
 141 extern void interp_pre_command_loop (struct interp *interp);
 142
 143 /* List the possible interpreters which could complete the given
 144    text.  */
 145 extern VEC (char_ptr) *interpreter_completer (struct cmd_list_element *ignore,
 146                                               const char *text,
 147                                               const char *word);
 148
 149 /* well-known interpreters */
 150 #define INTERP_CONSOLE          "console"
 151 #define INTERP_MI1             "mi1"
 152 #define INTERP_MI2             "mi2"
 153 #define INTERP_MI3             "mi3"
 154 #define INTERP_MI               "mi"
 155 #define INTERP_TUI              "tui"
 156 #define INTERP_INSIGHT          "insight"
 157
 158 #endif