gdb/language.h

   1 /* Source-language-related definitions for GDB.
   2    Copyright 1991, 1992, 2000 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 /* 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
  32 /* This used to be included to configure GDB for one or more specific
  33    languages.  Now it is shortcutted to configure for all of them.  FIXME.  */
  34 /* #include "lang_def.h" */
  35 #define _LANG_c
  36 #define _LANG_m2
  37 #define _LANG_chill
  38 #define _LANG_fortran
  39
  40 #define MAX_FORTRAN_DIMS  7     /* Maximum number of F77 array dims */
  41
  42 /* range_mode ==
  43    range_mode_auto:   range_check set automatically to default of language.
  44    range_mode_manual: range_check set manually by user.  */
  45
  46 extern enum range_mode
  47   {
  48     range_mode_auto, range_mode_manual
  49   }
  50 range_mode;
  51
  52 /* range_check ==
  53    range_check_on:    Ranges are checked in GDB expressions, producing errors.
  54    range_check_warn:  Ranges are checked, producing warnings.
  55    range_check_off:   Ranges are not checked in GDB expressions.  */
  56
  57 extern enum range_check
  58   {
  59     range_check_off, range_check_warn, range_check_on
  60   }
  61 range_check;
  62
  63 /* type_mode ==
  64    type_mode_auto:   type_check set automatically to default of language
  65    type_mode_manual: type_check set manually by user. */
  66
  67 extern enum type_mode
  68   {
  69     type_mode_auto, type_mode_manual
  70   }
  71 type_mode;
  72
  73 /* type_check ==
  74    type_check_on:    Types are checked in GDB expressions, producing errors.
  75    type_check_warn:  Types are checked, producing warnings.
  76    type_check_off:   Types are not checked in GDB expressions.  */
  77
  78 extern enum type_check
  79   {
  80     type_check_off, type_check_warn, type_check_on
  81   }
  82 type_check;
  83 \f
  84 /* Information for doing language dependent formatting of printed values. */
  85
  86 struct language_format_info
  87   {
  88     /* The format that can be passed directly to standard C printf functions
  89        to generate a completely formatted value in the format appropriate for
  90        the language. */
  91
  92     char *la_format;
  93
  94     /* The prefix to be used when directly printing a value, or constructing
  95        a standard C printf format.  This generally is everything up to the
  96        conversion specification (the part introduced by the '%' character
  97        and terminated by the conversion specifier character). */
  98
  99     char *la_format_prefix;
 100
 101     /* The conversion specifier.  This is generally everything after the
 102        field width and precision, typically only a single character such
 103        as 'o' for octal format or 'x' for hexadecimal format. */
 104
 105     char *la_format_specifier;
 106
 107     /* The suffix to be used when directly printing a value, or constructing
 108        a standard C printf format.  This generally is everything after the
 109        conversion specification (the part introduced by the '%' character
 110        and terminated by the conversion specifier character). */
 111
 112     char *la_format_suffix;     /* Suffix for custom format string */
 113   };
 114
 115 /* Structure tying together assorted information about a language.  */
 116
 117 struct language_defn
 118   {
 119     /* Name of the language */
 120
 121     char *la_name;
 122
 123     /* its symtab language-enum (defs.h) */
 124
 125     enum language la_language;
 126
 127     /* Its builtin types.  This is a vector ended by a NULL pointer.  These
 128        types can be specified by name in parsing types in expressions,
 129        regardless of whether the program being debugged actually defines
 130        such a type.  */
 131
 132     struct type **const *la_builtin_type_vector;
 133
 134     /* Default range checking */
 135
 136     enum range_check la_range_check;
 137
 138     /* Default type checking */
 139
 140     enum type_check la_type_check;
 141
 142     /* Parser function. */
 143
 144     int (*la_parser) PARAMS ((void));
 145
 146     /* Parser error function */
 147
 148     void (*la_error) PARAMS ((char *));
 149
 150     /* Evaluate an expression. */
 151     struct value *(*evaluate_exp) PARAMS ((struct type *, struct expression *,
 152                                            int *, enum noside));
 153
 154     void (*la_printchar) (int ch, struct ui_file * stream);
 155
 156     void (*la_printstr) (struct ui_file * stream, char *string,
 157                          unsigned int length, int width,
 158                          int force_ellipses);
 159
 160     void (*la_emitchar) (int ch, struct ui_file * stream, int quoter);
 161
 162     struct type *(*la_fund_type) PARAMS ((struct objfile *, int));
 163
 164     /* Print a type using syntax appropriate for this language. */
 165
 166     void (*la_print_type) (struct type *, char *, struct ui_file *, int,
 167                            int);
 168
 169     /* Print a value using syntax appropriate for this language. */
 170
 171     int (*la_val_print) (struct type *, char *, int, CORE_ADDR,
 172                          struct ui_file *, int, int, int,
 173                          enum val_prettyprint);
 174
 175     /* Print a top-level value using syntax appropriate for this language. */
 176
 177     int (*la_value_print) (struct value *, struct ui_file *,
 178                            int, enum val_prettyprint);
 179
 180     /* Base 2 (binary) formats. */
 181
 182     struct language_format_info la_binary_format;
 183
 184     /* Base 8 (octal) formats. */
 185
 186     struct language_format_info la_octal_format;
 187
 188     /* Base 10 (decimal) formats */
 189
 190     struct language_format_info la_decimal_format;
 191
 192     /* Base 16 (hexadecimal) formats */
 193
 194     struct language_format_info la_hex_format;
 195
 196     /* Table for printing expressions */
 197
 198     const struct op_print *la_op_print_tab;
 199
 200     /* Zero if the language has first-class arrays.  True if there are no
 201        array values, and array objects decay to pointers, as in C. */
 202
 203     char c_style_arrays;
 204
 205     /* Index to use for extracting the first element of a string. */
 206     char string_lower_bound;
 207
 208     /* Type of elements of strings. */
 209     struct type **string_char_type;
 210
 211     /* Add fields above this point, so the magic number is always last. */
 212     /* Magic number for compat checking */
 213
 214     long la_magic;
 215
 216   };
 217
 218 #define LANG_MAGIC      910823L
 219
 220 /* Pointer to the language_defn for our current language.  This pointer
 221    always points to *some* valid struct; it can be used without checking
 222    it for validity.
 223
 224    The current language affects expression parsing and evaluation
 225    (FIXME: it might be cleaner to make the evaluation-related stuff
 226    separate exp_opcodes for each different set of semantics.  We
 227    should at least think this through more clearly with respect to
 228    what happens if the language is changed between parsing and
 229    evaluation) and printing of things like types and arrays.  It does
 230    *not* affect symbol-reading-- each source file in a symbol-file has
 231    its own language and we should keep track of that regardless of the
 232    language when symbols are read.  If we want some manual setting for
 233    the language of symbol files (e.g. detecting when ".c" files are
 234    C++), it should be a seprate setting from the current_language.  */
 235
 236 extern const struct language_defn *current_language;
 237
 238 /* Pointer to the language_defn expected by the user, e.g. the language
 239    of main(), or the language we last mentioned in a message, or C.  */
 240
 241 extern const struct language_defn *expected_language;
 242
 243 /* language_mode ==
 244    language_mode_auto:   current_language automatically set upon selection
 245    of scope (e.g. stack frame)
 246    language_mode_manual: current_language set only by user.  */
 247
 248 extern enum language_mode
 249   {
 250     language_mode_auto, language_mode_manual
 251   }
 252 language_mode;
 253 \f
 254 /* These macros define the behaviour of the expression
 255    evaluator.  */
 256
 257 /* Should we strictly type check expressions? */
 258 #define STRICT_TYPE (type_check != type_check_off)
 259
 260 /* Should we range check values against the domain of their type? */
 261 #define RANGE_CHECK (range_check != range_check_off)
 262
 263 /* "cast" really means conversion */
 264 /* FIXME -- should be a setting in language_defn */
 265 #define CAST_IS_CONVERSION (current_language->la_language == language_c  || \
 266                             current_language->la_language == language_cplus)
 267
 268 extern void language_info (int);
 269
 270 extern enum language set_language (enum language);
 271 \f
 272
 273 /* This page contains functions that return things that are
 274    specific to languages.  Each of these functions is based on
 275    the current setting of working_lang, which the user sets
 276    with the "set language" command. */
 277
 278 #define create_fundamental_type(objfile,typeid) \
 279   (current_language->la_fund_type(objfile, typeid))
 280
 281 #define LA_PRINT_TYPE(type,varstring,stream,show,level) \
 282   (current_language->la_print_type(type,varstring,stream,show,level))
 283
 284 #define LA_VAL_PRINT(type,valaddr,offset,addr,stream,fmt,deref,recurse,pretty) \
 285   (current_language->la_val_print(type,valaddr,offset,addr,stream,fmt,deref, \
 286                                   recurse,pretty))
 287 #define LA_VALUE_PRINT(val,stream,fmt,pretty) \
 288   (current_language->la_value_print(val,stream,fmt,pretty))
 289
 290 /* Return a format string for printf that will print a number in one of
 291    the local (language-specific) formats.  Result is static and is
 292    overwritten by the next call.  Takes printf options like "08" or "l"
 293    (to produce e.g. %08x or %lx).  */
 294
 295 #define local_binary_format() \
 296   (current_language->la_binary_format.la_format)
 297 #define local_binary_format_prefix() \
 298   (current_language->la_binary_format.la_format_prefix)
 299 #define local_binary_format_specifier() \
 300   (current_language->la_binary_format.la_format_specifier)
 301 #define local_binary_format_suffix() \
 302   (current_language->la_binary_format.la_format_suffix)
 303
 304 #define local_octal_format() \
 305   (current_language->la_octal_format.la_format)
 306 #define local_octal_format_prefix() \
 307   (current_language->la_octal_format.la_format_prefix)
 308 #define local_octal_format_specifier() \
 309   (current_language->la_octal_format.la_format_specifier)
 310 #define local_octal_format_suffix() \
 311   (current_language->la_octal_format.la_format_suffix)
 312
 313 #define local_decimal_format() \
 314   (current_language->la_decimal_format.la_format)
 315 #define local_decimal_format_prefix() \
 316   (current_language->la_decimal_format.la_format_prefix)
 317 #define local_decimal_format_specifier() \
 318   (current_language->la_decimal_format.la_format_specifier)
 319 #define local_decimal_format_suffix() \
 320   (current_language->la_decimal_format.la_format_suffix)
 321
 322 #define local_hex_format() \
 323   (current_language->la_hex_format.la_format)
 324 #define local_hex_format_prefix() \
 325   (current_language->la_hex_format.la_format_prefix)
 326 #define local_hex_format_specifier() \
 327   (current_language->la_hex_format.la_format_specifier)
 328 #define local_hex_format_suffix() \
 329   (current_language->la_hex_format.la_format_suffix)
 330
 331 #define LA_PRINT_CHAR(ch, stream) \
 332   (current_language->la_printchar(ch, stream))
 333 #define LA_PRINT_STRING(stream, string, length, width, force_ellipses) \
 334   (current_language->la_printstr(stream, string, length, width, force_ellipses))
 335 #define LA_EMIT_CHAR(ch, stream, quoter) \
 336   (current_language->la_emitchar(ch, stream, quoter))
 337
 338 /* Test a character to decide whether it can be printed in literal form
 339    or needs to be printed in another representation.  For example,
 340    in C the literal form of the character with octal value 141 is 'a'
 341    and the "other representation" is '\141'.  The "other representation"
 342    is program language dependent. */
 343
 344 #define PRINT_LITERAL_FORM(c)           \
 345   ((c) >= 0x20                          \
 346    && ((c) < 0x7F || (c) >= 0xA0)       \
 347    && (!sevenbit_strings || (c) < 0x80))
 348
 349 /* Return a format string for printf that will print a number in one of
 350    the local (language-specific) formats.  Result is static and is
 351    overwritten by the next call.  Takes printf options like "08" or "l"
 352    (to produce e.g. %08x or %lx).  */
 353
 354 extern char *local_decimal_format_custom (char *);      /* language.c */
 355
 356 extern char *local_octal_format_custom (char *);        /* language.c */
 357
 358 extern char *local_hex_format_custom (char *);  /* language.c */
 359
 360 #if 0
 361 /* FIXME: cagney/2000-03-04: This function does not appear to be used.
 362    It can be deleted once 5.0 has been released. */
 363 /* Return a string that contains the hex digits of the number.  No preceeding
 364    "0x" */
 365
 366 extern char *longest_raw_hex_string (LONGEST);
 367 #endif
 368
 369 /* Return a string that contains a number formatted in one of the local
 370    (language-specific) formats.  Result is static and is overwritten by
 371    the next call.  Takes printf options like "08l" or "l".  */
 372
 373 extern char *local_hex_string (unsigned long);  /* language.c */
 374
 375 extern char *longest_local_hex_string (LONGEST);        /* language.c */
 376
 377 extern char *local_hex_string_custom (unsigned long, char *);   /* language.c */
 378
 379 extern char *longest_local_hex_string_custom (LONGEST, char *); /* language.c */
 380
 381 /* Type predicates */
 382
 383 extern int simple_type (struct type *);
 384
 385 extern int ordered_type (struct type *);
 386
 387 extern int same_type (struct type *, struct type *);
 388
 389 extern int integral_type (struct type *);
 390
 391 extern int numeric_type (struct type *);
 392
 393 extern int character_type (struct type *);
 394
 395 extern int boolean_type (struct type *);
 396
 397 extern int float_type (struct type *);
 398
 399 extern int pointer_type (struct type *);
 400
 401 extern int structured_type (struct type *);
 402
 403 /* Checks Binary and Unary operations for semantic type correctness */
 404 /* FIXME:  Does not appear to be used */
 405 #define unop_type_check(v,o) binop_type_check((v),NULL,(o))
 406
 407 extern void binop_type_check (struct value *, struct value *, int);
 408
 409 /* Error messages */
 410
 411 extern void op_error (char *fmt, enum exp_opcode, int);
 412
 413 #define type_op_error(f,o) \
 414    op_error((f),(o),type_check==type_check_on ? 1 : 0)
 415 #define range_op_error(f,o) \
 416    op_error((f),(o),range_check==range_check_on ? 1 : 0)
 417
 418 extern void type_error (char *, ...) ATTR_FORMAT (printf, 1, 2);
 419
 420 void
 421 range_error (char *, ...)
 422 ATTR_FORMAT (printf, 1, 2);
 423
 424 /* Data:  Does this value represent "truth" to the current language?  */
 425
 426 extern int value_true (struct value *);
 427
 428 extern struct type *lang_bool_type (void);
 429
 430 /* The type used for Boolean values in the current language. */
 431 #define LA_BOOL_TYPE lang_bool_type ()
 432
 433 /* Misc:  The string representing a particular enum language.  */
 434
 435 extern enum language language_enum (char *str);
 436
 437 extern const struct language_defn *language_def (enum language);
 438
 439 extern char *language_str (enum language);
 440
 441 /* Add a language to the set known by GDB (at initialization time).  */
 442
 443 extern void add_language (const struct language_defn *);
 444
 445 extern enum language get_frame_language (void); /* In stack.c */
 446
 447 #endif /* defined (LANGUAGE_H) */