gdb/extension.h

   1 /* Interface between gdb and its extension languages.
   2
   3    Copyright (C) 2014-2016 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 #include "common/vec.h"
  25
  26 struct breakpoint;
  27 struct command_line;
  28 struct frame_info;
  29 struct language_defn;
  30 struct objfile;
  31 struct extension_language_defn;
  32 struct type;
  33 struct ui_file;
  34 struct ui_out;
  35 struct value;
  36 struct value_print_options;
  37
  38 /* A function to load and process a script file.
  39    The file has been opened and is ready to be read from the beginning.
  40    Any exceptions are not caught, and are passed to the caller.  */
  41 typedef void script_sourcer_func (const struct extension_language_defn *,
  42                                   FILE *stream, const char *filename);
  43
  44 /* A function to load and process a script for an objfile.
  45    The file has been opened and is ready to be read from the beginning.
  46    Any exceptions are not caught, and are passed to the caller.  */
  47 typedef void objfile_script_sourcer_func
  48   (const struct extension_language_defn *,
  49    struct objfile *, FILE *stream, const char *filename);
  50
  51 /* A function to execute a script for an objfile.
  52    Any exceptions are not caught, and are passed to the caller.  */
  53 typedef void objfile_script_executor_func
  54   (const struct extension_language_defn *,
  55    struct objfile *, const char *name, const char *script);
  56
  57 /* Enum of each extension(/scripting) language.  */
  58
  59 enum extension_language
  60   {
  61     EXT_LANG_NONE,
  62     EXT_LANG_GDB,
  63     EXT_LANG_PYTHON,
  64     EXT_LANG_GUILE
  65   };
  66
  67 /* Extension language frame-filter status return values.  */
  68
  69 enum ext_lang_bt_status
  70   {
  71     /* Return when an error has occurred in processing frame filters,
  72        or when printing the stack.  */
  73     EXT_LANG_BT_ERROR = -1,
  74
  75     /* Return from internal routines to indicate that the function
  76        succeeded.  */
  77     EXT_LANG_BT_OK = 1,
  78
  79     /* Return when the frame filter process is complete, and all
  80        operations have succeeded.  */
  81     EXT_LANG_BT_COMPLETED = 2,
  82
  83     /* Return when the frame filter process is complete, but there
  84        were no filter registered and enabled to process.  */
  85     EXT_LANG_BT_NO_FILTERS = 3
  86   };
  87
  88 /* Flags to pass to apply_extlang_frame_filter.  */
  89
  90 enum frame_filter_flags
  91   {
  92     /* Set this flag if frame level is to be printed.  */
  93     PRINT_LEVEL = 1,
  94
  95     /* Set this flag if frame information is to be printed.  */
  96     PRINT_FRAME_INFO = 2,
  97
  98     /* Set this flag if frame arguments are to be printed.  */
  99     PRINT_ARGS = 4,
 100
 101     /* Set this flag if frame locals are to be printed.  */
 102     PRINT_LOCALS = 8,
 103   };
 104
 105 /* A choice of the different frame argument printing strategies that
 106    can occur in different cases of frame filter instantiation.  */
 107
 108 enum ext_lang_frame_args
 109   {
 110     /* Print no values for arguments when invoked from the MI. */
 111     NO_VALUES = PRINT_NO_VALUES,
 112
 113     MI_PRINT_ALL_VALUES = PRINT_ALL_VALUES,
 114
 115     /* Print only simple values (what MI defines as "simple") for
 116        arguments when invoked from the MI. */
 117     MI_PRINT_SIMPLE_VALUES = PRINT_SIMPLE_VALUES,
 118
 119     /* Print only scalar values for arguments when invoked from the CLI. */
 120     CLI_SCALAR_VALUES,
 121
 122     /* Print all values for arguments when invoked from the CLI. */
 123     CLI_ALL_VALUES
 124   };
 125
 126 /* The possible results of
 127    extension_language_ops.breakpoint_cond_says_stop.  */
 128
 129 enum ext_lang_bp_stop
 130   {
 131     /* No "stop" condition is set.  */
 132     EXT_LANG_BP_STOP_UNSET,
 133
 134     /* A "stop" condition is set, and it says "don't stop".  */
 135     EXT_LANG_BP_STOP_NO,
 136
 137     /* A "stop" condition is set, and it says "stop".  */
 138     EXT_LANG_BP_STOP_YES
 139   };
 140
 141 /* Table of type printers associated with the global typedef table.  */
 142
 143 struct ext_lang_type_printers
 144 {
 145   /* Type-printers from Python.  */
 146   void *py_type_printers;
 147 };
 148
 149 /* A type which holds its extension language specific xmethod worker data.  */
 150
 151 struct xmethod_worker
 152 {
 153   /* The language the xmethod worker is implemented in.  */
 154   const struct extension_language_defn *extlang;
 155
 156   /* The extension language specific data for this xmethod worker.  */
 157   void *data;
 158
 159   /* The TYPE_CODE_XMETHOD value corresponding to this worker.
 160      Always use value_of_xmethod to access it.  */
 161   struct value *value;
 162 };
 163
 164 typedef struct xmethod_worker *xmethod_worker_ptr;
 165 DEF_VEC_P (xmethod_worker_ptr);
 166 typedef VEC (xmethod_worker_ptr) xmethod_worker_vec;
 167
 168 \f
 169 /* The interface for gdb's own extension(/scripting) language.  */
 170 extern const struct extension_language_defn extension_language_gdb;
 171
 172 extern const struct extension_language_defn *get_ext_lang_defn
 173   (enum extension_language lang);
 174
 175 extern const struct extension_language_defn *get_ext_lang_of_file
 176   (const char *file);
 177
 178 extern int ext_lang_present_p (const struct extension_language_defn *);
 179
 180 extern int ext_lang_initialized_p (const struct extension_language_defn *);
 181
 182 extern void throw_ext_lang_unsupported
 183   (const struct extension_language_defn *);
 184
 185 /* Accessors for "public" attributes of the extension language definition.  */
 186
 187 extern enum extension_language ext_lang_kind
 188   (const struct extension_language_defn *);
 189
 190 extern const char *ext_lang_name (const struct extension_language_defn *);
 191
 192 extern const char *ext_lang_capitalized_name
 193   (const struct extension_language_defn *);
 194
 195 extern const char *ext_lang_suffix (const struct extension_language_defn *);
 196
 197 extern const char *ext_lang_auto_load_suffix
 198   (const struct extension_language_defn *);
 199
 200 extern script_sourcer_func *ext_lang_script_sourcer
 201   (const struct extension_language_defn *);
 202
 203 extern objfile_script_sourcer_func *ext_lang_objfile_script_sourcer
 204   (const struct extension_language_defn *);
 205
 206 extern objfile_script_executor_func *ext_lang_objfile_script_executor
 207   (const struct extension_language_defn *);
 208
 209 extern int ext_lang_auto_load_enabled (const struct extension_language_defn *);
 210
 211 /* Wrappers for each extension language API function that iterate over all
 212    extension languages.  */
 213
 214 extern void finish_ext_lang_initialization (void);
 215
 216 extern void eval_ext_lang_from_control_command (struct command_line *cmd);
 217
 218 extern void auto_load_ext_lang_scripts_for_objfile (struct objfile *);
 219
 220 extern struct ext_lang_type_printers *start_ext_lang_type_printers (void);
 221
 222 extern char *apply_ext_lang_type_printers (struct ext_lang_type_printers *,
 223                                            struct type *);
 224
 225 extern void free_ext_lang_type_printers (struct ext_lang_type_printers *);
 226
 227 extern int apply_ext_lang_val_pretty_printer
 228   (struct type *type,
 229    LONGEST embedded_offset, CORE_ADDR address,
 230    struct ui_file *stream, int recurse,
 231    struct value *val, const struct value_print_options *options,
 232    const struct language_defn *language);
 233
 234 extern enum ext_lang_bt_status apply_ext_lang_frame_filter
 235   (struct frame_info *frame, int flags, enum ext_lang_frame_args args_type,
 236    struct ui_out *out, int frame_low, int frame_high);
 237
 238 extern void preserve_ext_lang_values (struct objfile *, htab_t copied_types);
 239
 240 extern const struct extension_language_defn *get_breakpoint_cond_ext_lang
 241   (struct breakpoint *b, enum extension_language skip_lang);
 242
 243 extern int breakpoint_ext_lang_cond_says_stop (struct breakpoint *);
 244
 245 extern struct value *invoke_xmethod (struct xmethod_worker *,
 246                                      struct value *,
 247                                      struct value **, int nargs);
 248
 249 extern struct xmethod_worker *clone_xmethod_worker (struct xmethod_worker *);
 250
 251 extern struct xmethod_worker *new_xmethod_worker
 252   (const struct extension_language_defn *extlang, void *data);
 253
 254 extern void free_xmethod_worker (struct xmethod_worker *);
 255
 256 extern void free_xmethod_worker_vec (void *vec);
 257
 258 extern xmethod_worker_vec *get_matching_xmethod_workers
 259   (struct type *, const char *);
 260
 261 extern struct type **get_xmethod_arg_types (struct xmethod_worker *, int *);
 262
 263 extern struct type *get_xmethod_result_type (struct xmethod_worker *,
 264                                              struct value *object,
 265                                              struct value **args, int nargs);
 266
 267 #endif /* EXTENSION_H */