gdb/language.h

   1 /* Source-language-related definitions for GDB.
   2    Copyright 1991, 1992 Free Software Foundation, Inc.
   3    Contributed by the Department of Computer Science at the State University
   4    of New York at Buffalo.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (LANGUAGE_H)
  24 #define LANGUAGE_H 1
  25
  26 #ifdef __STDC__                 /* Forward decls for prototypes */
  27 struct value;
  28 struct objfile;
  29 struct expression;
  30 /* enum exp_opcode;     ANSI's `wisdom' didn't include forward enum decls. */
  31 #endif
  32
  33 /* This used to be included to configure GDB for one or more specific
  34    languages.  Now it is shortcutted to configure for all of them.  FIXME.  */
  35 /* #include "lang_def.h" */
  36 #define _LANG_c
  37 #define _LANG_m2
  38 #define _LANG_chill
  39 #define _LANG_fortran
  40
  41 #define MAX_FORTRAN_DIMS  7     /* Maximum number of F77 array dims */
  42
  43 /* range_mode ==
  44    range_mode_auto:   range_check set automatically to default of language.
  45    range_mode_manual: range_check set manually by user.  */
  46
  47 extern enum range_mode
  48   {
  49     range_mode_auto, range_mode_manual
  50   }
  51 range_mode;
  52
  53 /* range_check ==
  54    range_check_on:    Ranges are checked in GDB expressions, producing errors.
  55    range_check_warn:  Ranges are checked, producing warnings.
  56    range_check_off:   Ranges are not checked in GDB expressions.  */
  57
  58 extern enum range_check
  59   {
  60     range_check_off, range_check_warn, range_check_on
  61   }
  62 range_check;
  63
  64 /* type_mode ==
  65    type_mode_auto:   type_check set automatically to default of language
  66    type_mode_manual: type_check set manually by user. */
  67
  68 extern enum type_mode
  69   {
  70     type_mode_auto, type_mode_manual
  71   }
  72 type_mode;
  73
  74 /* type_check ==
  75    type_check_on:    Types are checked in GDB expressions, producing errors.
  76    type_check_warn:  Types are checked, producing warnings.
  77    type_check_off:   Types are not checked in GDB expressions.  */
  78
  79 extern enum type_check
  80   {
  81     type_check_off, type_check_warn, type_check_on
  82   }
  83 type_check;
  84 \f
  85 /* Information for doing language dependent formatting of printed values. */
  86
  87 struct language_format_info
  88   {
  89     /* The format that can be passed directly to standard C printf functions
  90        to generate a completely formatted value in the format appropriate for
  91        the language. */
  92
  93     char *la_format;
  94
  95     /* The prefix to be used when directly printing a value, or constructing
  96        a standard C printf format.  This generally is everything up to the
  97        conversion specification (the part introduced by the '%' character
  98        and terminated by the conversion specifier character). */
  99
 100     char *la_format_prefix;
 101
 102     /* The conversion specifier.  This is generally everything after the
 103        field width and precision, typically only a single character such
 104        as 'o' for octal format or 'x' for hexadecimal format. */
 105
 106     char *la_format_specifier;
 107
 108     /* The suffix to be used when directly printing a value, or constructing
 109        a standard C printf format.  This generally is everything after the
 110        conversion specification (the part introduced by the '%' character
 111        and terminated by the conversion specifier character). */
 112
 113     char *la_format_suffix;     /* Suffix for custom format string */
 114   };
 115
 116 /* Structure tying together assorted information about a language.  */
 117
 118 struct language_defn
 119   {
 120     /* Name of the language */
 121
 122     char *la_name;
 123
 124     /* its symtab language-enum (defs.h) */
 125
 126     enum language la_language;
 127
 128     /* Its builtin types.  This is a vector ended by a NULL pointer.  These
 129        types can be specified by name in parsing types in expressions,
 130        regardless of whether the program being debugged actually defines
 131        such a type.  */
 132
 133     struct type **const *la_builtin_type_vector;
 134
 135     /* Default range checking */
 136
 137     enum range_check la_range_check;
 138
 139     /* Default type checking */
 140
 141     enum type_check la_type_check;
 142
 143     /* Parser function. */
 144
 145     int (*la_parser) PARAMS ((void));
 146
 147     /* Parser error function */
 148
 149     void (*la_error) PARAMS ((char *));
 150
 151     /* Evaluate an expression. */
 152     struct value *(*evaluate_exp) PARAMS ((struct type *, struct expression *,
 153                                            int *, enum noside));
 154
 155     void (*la_printchar) PARAMS ((int ch, GDB_FILE * stream));
 156
 157     void (*la_printstr) PARAMS ((GDB_FILE * stream, char *string,
 158                                  unsigned int length, int width,
 159                                  int force_ellipses));
 160
 161     void (*la_emitchar) PARAMS ((int ch, GDB_FILE * stream, int quoter));
 162
 163     struct type *(*la_fund_type) PARAMS ((struct objfile *, int));
 164
 165     /* Print a type using syntax appropriate for this language. */
 166
 167     void (*la_print_type) PARAMS ((struct type *, char *, GDB_FILE *, int, int));
 168
 169     /* Print a value using syntax appropriate for this language. */
 170
 171     int (*la_val_print) PARAMS ((struct type *, char *, int, CORE_ADDR, GDB_FILE *,
 172                                  int, int, int, enum val_prettyprint));
 173
 174     /* Print a top-level value using syntax appropriate for this language. */
 175
 176     int (*la_value_print) PARAMS ((struct value *, GDB_FILE *,
 177                                    int, enum val_prettyprint));
 178
 179     /* Base 2 (binary) formats. */
 180
 181     struct language_format_info la_binary_format;
 182
 183     /* Base 8 (octal) formats. */
 184
 185     struct language_format_info la_octal_format;
 186
 187     /* Base 10 (decimal) formats */
 188
 189     struct language_format_info la_decimal_format;
 190
 191     /* Base 16 (hexadecimal) formats */
 192
 193     struct language_format_info la_hex_format;
 194
 195     /* Table for printing expressions */
 196
 197     const struct op_print *la_op_print_tab;
 198
 199     /* Zero if the language has first-class arrays.  True if there are no
 200        array values, and array objects decay to pointers, as in C. */
 201
 202     char c_style_arrays;
 203
 204     /* Index to use for extracting the first element of a string. */
 205     char string_lower_bound;
 206
 207     /* Type of elements of strings. */
 208     struct type **string_char_type;
 209
 210     /* Add fields above this point, so the magic number is always last. */
 211     /* Magic number for compat checking */
 212
 213     long la_magic;
 214
 215   };
 216
 217 #define LANG_MAGIC      910823L
 218
 219 /* Pointer to the language_defn for our current language.  This pointer
 220    always points to *some* valid struct; it can be used without checking
 221    it for validity.
 222
 223    The current language affects expression parsing and evaluation
 224    (FIXME: it might be cleaner to make the evaluation-related stuff
 225    separate exp_opcodes for each different set of semantics.  We
 226    should at least think this through more clearly with respect to
 227    what happens if the language is changed between parsing and
 228    evaluation) and printing of things like types and arrays.  It does
 229    *not* affect symbol-reading-- each source file in a symbol-file has
 230    its own language and we should keep track of that regardless of the
 231    language when symbols are read.  If we want some manual setting for
 232    the language of symbol files (e.g. detecting when ".c" files are
 233    C++), it should be a seprate setting from the current_language.  */
 234
 235 extern const struct language_defn *current_language;
 236
 237 /* Pointer to the language_defn expected by the user, e.g. the language
 238    of main(), or the language we last mentioned in a message, or C.  */
 239
 240 extern const struct language_defn *expected_language;
 241
 242 /* language_mode ==
 243    language_mode_auto:   current_language automatically set upon selection
 244    of scope (e.g. stack frame)
 245    language_mode_manual: current_language set only by user.  */
 246
 247 extern enum language_mode
 248   {
 249     language_mode_auto, language_mode_manual
 250   }
 251 language_mode;
 252 \f
 253 /* These macros define the behaviour of the expression
 254    evaluator.  */
 255
 256 /* Should we strictly type check expressions? */
 257 #define STRICT_TYPE (type_check != type_check_off)
 258
 259 /* Should we range check values against the domain of their type? */
 260 #define RANGE_CHECK (range_check != range_check_off)
 261
 262 /* "cast" really means conversion */
 263 /* FIXME -- should be a setting in language_defn */
 264 #define CAST_IS_CONVERSION (current_language->la_language == language_c  || \
 265                             current_language->la_language == language_cplus)
 266
 267 extern void
 268 language_info PARAMS ((int));
 269
 270 extern enum language
 271 set_language PARAMS ((enum language));
 272 \f
 273
 274 /* This page contains functions that return things that are
 275    specific to languages.  Each of these functions is based on
 276    the current setting of working_lang, which the user sets
 277    with the "set language" command. */
 278
 279 #define create_fundamental_type(objfile,typeid) \
 280   (current_language->la_fund_type(objfile, typeid))
 281
 282 #define LA_PRINT_TYPE(type,varstring,stream,show,level) \
 283   (current_language->la_print_type(type,varstring,stream,show,level))
 284
 285 #define LA_VAL_PRINT(type,valaddr,offset,addr,stream,fmt,deref,recurse,pretty) \
 286   (current_language->la_val_print(type,valaddr,offset,addr,stream,fmt,deref, \
 287                                   recurse,pretty))
 288 #define LA_VALUE_PRINT(val,stream,fmt,pretty) \
 289   (current_language->la_value_print(val,stream,fmt,pretty))
 290
 291 /* Return a format string for printf that will print a number in one of
 292    the local (language-specific) formats.  Result is static and is
 293    overwritten by the next call.  Takes printf options like "08" or "l"
 294    (to produce e.g. %08x or %lx).  */
 295
 296 #define local_binary_format() \
 297   (current_language->la_binary_format.la_format)
 298 #define local_binary_format_prefix() \
 299   (current_language->la_binary_format.la_format_prefix)
 300 #define local_binary_format_specifier() \
 301   (current_language->la_binary_format.la_format_specifier)
 302 #define local_binary_format_suffix() \
 303   (current_language->la_binary_format.la_format_suffix)
 304
 305 #define local_octal_format() \
 306   (current_language->la_octal_format.la_format)
 307 #define local_octal_format_prefix() \
 308   (current_language->la_octal_format.la_format_prefix)
 309 #define local_octal_format_specifier() \
 310   (current_language->la_octal_format.la_format_specifier)
 311 #define local_octal_format_suffix() \
 312   (current_language->la_octal_format.la_format_suffix)
 313
 314 #define local_decimal_format() \
 315   (current_language->la_decimal_format.la_format)
 316 #define local_decimal_format_prefix() \
 317   (current_language->la_decimal_format.la_format_prefix)
 318 #define local_decimal_format_specifier() \
 319   (current_language->la_decimal_format.la_format_specifier)
 320 #define local_decimal_format_suffix() \
 321   (current_language->la_decimal_format.la_format_suffix)
 322
 323 #define local_hex_format() \
 324   (current_language->la_hex_format.la_format)
 325 #define local_hex_format_prefix() \
 326   (current_language->la_hex_format.la_format_prefix)
 327 #define local_hex_format_specifier() \
 328   (current_language->la_hex_format.la_format_specifier)
 329 #define local_hex_format_suffix() \
 330   (current_language->la_hex_format.la_format_suffix)
 331
 332 #define LA_PRINT_CHAR(ch, stream) \
 333   (current_language->la_printchar(ch, stream))
 334 #define LA_PRINT_STRING(stream, string, length, width, force_ellipses) \
 335   (current_language->la_printstr(stream, string, length, width, force_ellipses))
 336 #define LA_EMIT_CHAR(ch, stream, quoter) \
 337   (current_language->la_emitchar(ch, stream, quoter))
 338
 339 /* Test a character to decide whether it can be printed in literal form
 340    or needs to be printed in another representation.  For example,
 341    in C the literal form of the character with octal value 141 is 'a'
 342    and the "other representation" is '\141'.  The "other representation"
 343    is program language dependent. */
 344
 345 #define PRINT_LITERAL_FORM(c)           \
 346   ((c) >= 0x20                          \
 347    && ((c) < 0x7F || (c) >= 0xA0)       \
 348    && (!sevenbit_strings || (c) < 0x80))
 349
 350 /* Return a format string for printf that will print a number in one of
 351    the local (language-specific) formats.  Result is static and is
 352    overwritten by the next call.  Takes printf options like "08" or "l"
 353    (to produce e.g. %08x or %lx).  */
 354
 355 extern char *
 356   local_decimal_format_custom PARAMS ((char *));        /* language.c */
 357
 358 extern char *
 359   local_octal_format_custom PARAMS ((char *));  /* language.c */
 360
 361 extern char *
 362   local_hex_format_custom PARAMS ((char *));    /* language.c */
 363
 364 /* Return a string that contains a number formatted in one of the local
 365    (language-specific) formats.  Result is static and is overwritten by
 366    the next call.  Takes printf options like "08" or "l".  */
 367
 368 extern char *
 369   local_hex_string PARAMS ((unsigned long));    /* language.c */
 370
 371 extern char *
 372   local_hex_string_custom PARAMS ((unsigned long, char *));     /* language.c */
 373
 374 /* Type predicates */
 375
 376 extern int
 377 simple_type PARAMS ((struct type *));
 378
 379 extern int
 380 ordered_type PARAMS ((struct type *));
 381
 382 extern int
 383 same_type PARAMS ((struct type *, struct type *));
 384
 385 extern int
 386 integral_type PARAMS ((struct type *));
 387
 388 extern int
 389 numeric_type PARAMS ((struct type *));
 390
 391 extern int
 392 character_type PARAMS ((struct type *));
 393
 394 extern int
 395 boolean_type PARAMS ((struct type *));
 396
 397 extern int
 398 float_type PARAMS ((struct type *));
 399
 400 extern int
 401 pointer_type PARAMS ((struct type *));
 402
 403 extern int
 404 structured_type PARAMS ((struct type *));
 405
 406 /* Checks Binary and Unary operations for semantic type correctness */
 407 /* FIXME:  Does not appear to be used */
 408 #define unop_type_check(v,o) binop_type_check((v),NULL,(o))
 409
 410 extern void
 411 binop_type_check PARAMS ((struct value *, struct value *, int));
 412
 413 /* Error messages */
 414
 415 extern void
 416 op_error PARAMS ((char *fmt, enum exp_opcode, int));
 417
 418 #define type_op_error(f,o) \
 419    op_error((f),(o),type_check==type_check_on ? 1 : 0)
 420 #define range_op_error(f,o) \
 421    op_error((f),(o),range_check==range_check_on ? 1 : 0)
 422
 423 extern void
 424   type_error
 425 PARAMS ((char *,...))
 426 ATTR_FORMAT (printf, 1, 2);
 427
 428      void
 429      range_error PARAMS ((char *,...))
 430   ATTR_FORMAT (printf, 1, 2);
 431
 432 /* Data:  Does this value represent "truth" to the current language?  */
 433
 434      extern int
 435      value_true PARAMS ((struct value *));
 436
 437      extern struct type *lang_bool_type PARAMS ((void));
 438
 439 /* The type used for Boolean values in the current language. */
 440 #define LA_BOOL_TYPE lang_bool_type ()
 441
 442 /* Misc:  The string representing a particular enum language.  */
 443
 444      extern enum language language_enum PARAMS ((char *str));
 445
 446      extern const struct language_defn *language_def PARAMS ((enum language));
 447
 448      extern char *language_str PARAMS ((enum language));
 449
 450 /* Add a language to the set known by GDB (at initialization time).  */
 451
 452      extern void
 453      add_language PARAMS ((const struct language_defn *));
 454
 455      extern enum language
 456      get_frame_language PARAMS ((void));        /* In stack.c */
 457
 458 #endif /* defined (LANGUAGE_H) */