gdb/extension.h

   1 /* Interface between gdb and its extension languages.
   2
   3    Copyright (C) 2014 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 EXTENSION_H
  21 #define EXTENSION_H
  22
  23 #include "mi/mi-cmds.h" /* For PRINT_NO_VALUES, etc.  */
  24
  25 struct breakpoint;
  26 struct command_line;
  27 struct frame_info;
  28 struct language_defn;
  29 struct objfile;
  30 struct extension_language_defn;
  31 struct type;
  32 struct ui_file;
  33 struct ui_out;
  34 struct value;
  35 struct value_print_options;
  36
  37 /* A function to load and process a script file.
  38    The file has been opened and is ready to be read from the beginning.
  39    Any exceptions are not caught, and are passed to the caller.  */
  40 typedef void script_sourcer_func (const struct extension_language_defn *,
  41                                   FILE *stream, const char *filename);
  42
  43 /* A function to load and process a script for an objfile.
  44    The file has been opened and is ready to be read from the beginning.
  45    Any exceptions are not caught, and are passed to the caller.  */
  46 typedef void objfile_script_sourcer_func
  47   (const struct extension_language_defn *,
  48    struct objfile *, FILE *stream, const char *filename);
  49
  50 /* Enum of each extension(/scripting) language.  */
  51
  52 enum extension_language
  53   {
  54     EXT_LANG_NONE,
  55     EXT_LANG_GDB,
  56     EXT_LANG_PYTHON,
  57     EXT_LANG_GUILE
  58   };
  59
  60 /* Extension language frame-filter status return values.  */
  61
  62 enum ext_lang_bt_status
  63   {
  64     /* Return when an error has occurred in processing frame filters,
  65        or when printing the stack.  */
  66     EXT_LANG_BT_ERROR = -1,
  67
  68     /* Return from internal routines to indicate that the function
  69        succeeded.  */
  70     EXT_LANG_BT_OK = 1,
  71
  72     /* Return when the frame filter process is complete, and all
  73        operations have succeeded.  */
  74     EXT_LANG_BT_COMPLETED = 2,
  75
  76     /* Return when the frame filter process is complete, but there
  77        were no filter registered and enabled to process.  */
  78     EXT_LANG_BT_NO_FILTERS = 3
  79   };
  80
  81 /* Flags to pass to apply_extlang_frame_filter.  */
  82
  83 enum frame_filter_flags
  84   {
  85     /* Set this flag if frame level is to be printed.  */
  86     PRINT_LEVEL = 1,
  87
  88     /* Set this flag if frame information is to be printed.  */
  89     PRINT_FRAME_INFO = 2,
  90
  91     /* Set this flag if frame arguments are to be printed.  */
  92     PRINT_ARGS = 4,
  93
  94     /* Set this flag if frame locals are to be printed.  */
  95     PRINT_LOCALS = 8,
  96   };
  97
  98 /* A choice of the different frame argument printing strategies that
  99    can occur in different cases of frame filter instantiation.  */
 100
 101 enum ext_lang_frame_args
 102   {
 103     /* Print no values for arguments when invoked from the MI. */
 104     NO_VALUES = PRINT_NO_VALUES,
 105
 106     MI_PRINT_ALL_VALUES = PRINT_ALL_VALUES,
 107
 108     /* Print only simple values (what MI defines as "simple") for
 109        arguments when invoked from the MI. */
 110     MI_PRINT_SIMPLE_VALUES = PRINT_SIMPLE_VALUES,
 111
 112     /* Print only scalar values for arguments when invoked from the CLI. */
 113     CLI_SCALAR_VALUES,
 114
 115     /* Print all values for arguments when invoked from the CLI. */
 116     CLI_ALL_VALUES
 117   };
 118
 119 /* The possible results of
 120    extension_language_ops.breakpoint_cond_says_stop.  */
 121
 122 enum ext_lang_bp_stop
 123   {
 124     /* No "stop" condition is set.  */
 125     EXT_LANG_BP_STOP_UNSET,
 126
 127     /* A "stop" condition is set, and it says "don't stop".  */
 128     EXT_LANG_BP_STOP_NO,
 129
 130     /* A "stop" condition is set, and it says "stop".  */
 131     EXT_LANG_BP_STOP_YES
 132   };
 133
 134 /* Table of type printers associated with the global typedef table.  */
 135
 136 struct ext_lang_type_printers
 137 {
 138   /* Type-printers from Python.  */
 139   void *py_type_printers;
 140 };
 141 \f
 142 /* The interface for gdb's own extension(/scripting) language.  */
 143 extern const struct extension_language_defn extension_language_gdb;
 144
 145 extern const struct extension_language_defn *get_ext_lang_defn
 146   (enum extension_language lang);
 147
 148 extern const struct extension_language_defn *get_ext_lang_of_file
 149   (const char *file);
 150
 151 extern int ext_lang_present_p (const struct extension_language_defn *);
 152
 153 extern int ext_lang_initialized_p (const struct extension_language_defn *);
 154
 155 extern void throw_ext_lang_unsupported
 156   (const struct extension_language_defn *);
 157
 158 /* Accessors for "public" attributes of the extension language definition.  */
 159
 160 extern enum extension_language ext_lang_kind
 161   (const struct extension_language_defn *);
 162
 163 extern const char *ext_lang_name (const struct extension_language_defn *);
 164
 165 extern const char *ext_lang_capitalized_name
 166   (const struct extension_language_defn *);
 167
 168 extern const char *ext_lang_suffix (const struct extension_language_defn *);
 169
 170 extern const char *ext_lang_auto_load_suffix
 171   (const struct extension_language_defn *);
 172
 173 extern script_sourcer_func *ext_lang_script_sourcer
 174   (const struct extension_language_defn *);
 175
 176 extern objfile_script_sourcer_func *ext_lang_objfile_script_sourcer
 177   (const struct extension_language_defn *);
 178
 179 extern int ext_lang_auto_load_enabled (const struct extension_language_defn *);
 180
 181 /* Wrappers for each extension language API function that iterate over all
 182    extension languages.  */
 183
 184 extern void finish_ext_lang_initialization (void);
 185
 186 extern void eval_ext_lang_from_control_command (struct command_line *cmd);
 187
 188 extern void auto_load_ext_lang_scripts_for_objfile (struct objfile *);
 189
 190 extern struct ext_lang_type_printers *start_ext_lang_type_printers (void);
 191
 192 extern char *apply_ext_lang_type_printers (struct ext_lang_type_printers *,
 193                                            struct type *);
 194
 195 extern void free_ext_lang_type_printers (struct ext_lang_type_printers *);
 196
 197 extern int apply_ext_lang_val_pretty_printer
 198   (struct type *type, const gdb_byte *valaddr,
 199    int embedded_offset, CORE_ADDR address,
 200    struct ui_file *stream, int recurse,
 201    const struct value *val, const struct value_print_options *options,
 202    const struct language_defn *language);
 203
 204 extern enum ext_lang_bt_status apply_ext_lang_frame_filter
 205   (struct frame_info *frame, int flags, enum ext_lang_frame_args args_type,
 206    struct ui_out *out, int frame_low, int frame_high);
 207
 208 extern void preserve_ext_lang_values (struct objfile *, htab_t copied_types);
 209
 210 extern const struct extension_language_defn *get_breakpoint_cond_ext_lang
 211   (struct breakpoint *b, enum extension_language skip_lang);
 212
 213 extern int breakpoint_ext_lang_cond_says_stop (struct breakpoint *);
 214
 215 #endif /* EXTENSION_H */