gdb/language.h

   1 /* Source-language-related definitions for GDB.
   2
   3    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2003, 2004,
   4    2007, 2008 Free Software Foundation, Inc.
   5
   6    Contributed by the Department of Computer Science at the State University
   7    of New York at Buffalo.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  23
  24 #if !defined (LANGUAGE_H)
  25 #define LANGUAGE_H 1
  26
  27 /* Forward decls for prototypes */
  28 struct value;
  29 struct objfile;
  30 struct frame_info;
  31 struct expression;
  32 struct ui_file;
  33
  34 #define MAX_FORTRAN_DIMS  7     /* Maximum number of F77 array dims */
  35
  36 /* range_mode ==
  37    range_mode_auto:   range_check set automatically to default of language.
  38    range_mode_manual: range_check set manually by user.  */
  39
  40 extern enum range_mode
  41   {
  42     range_mode_auto, range_mode_manual
  43   }
  44 range_mode;
  45
  46 /* range_check ==
  47    range_check_on:    Ranges are checked in GDB expressions, producing errors.
  48    range_check_warn:  Ranges are checked, producing warnings.
  49    range_check_off:   Ranges are not checked in GDB expressions.  */
  50
  51 extern enum range_check
  52   {
  53     range_check_off, range_check_warn, range_check_on
  54   }
  55 range_check;
  56
  57 /* type_mode ==
  58    type_mode_auto:   type_check set automatically to default of language
  59    type_mode_manual: type_check set manually by user. */
  60
  61 extern enum type_mode
  62   {
  63     type_mode_auto, type_mode_manual
  64   }
  65 type_mode;
  66
  67 /* type_check ==
  68    type_check_on:    Types are checked in GDB expressions, producing errors.
  69    type_check_warn:  Types are checked, producing warnings.
  70    type_check_off:   Types are not checked in GDB expressions.  */
  71
  72 extern enum type_check
  73   {
  74     type_check_off, type_check_warn, type_check_on
  75   }
  76 type_check;
  77
  78 /* case_mode ==
  79    case_mode_auto:   case_sensitivity set upon selection of scope
  80    case_mode_manual: case_sensitivity set only by user.  */
  81
  82 extern enum case_mode
  83   {
  84     case_mode_auto, case_mode_manual
  85   }
  86 case_mode;
  87
  88 /* array_ordering ==
  89    array_row_major:     Arrays are in row major order
  90    array_column_major:  Arrays are in column major order.*/
  91
  92 extern enum array_ordering
  93   {
  94     array_row_major, array_column_major
  95   }
  96 array_ordering;
  97
  98
  99 /* case_sensitivity ==
 100    case_sensitive_on:   Case sensitivity in name matching is used
 101    case_sensitive_off:  Case sensitivity in name matching is not used  */
 102
 103 extern enum case_sensitivity
 104   {
 105     case_sensitive_on, case_sensitive_off
 106   }
 107 case_sensitivity;
 108
 109
 110 /* macro_expansion ==
 111    macro_expansion_no:  No macro expansion is available
 112    macro_expansion_c:   C-like macro expansion is available  */
 113
 114 enum macro_expansion
 115   {
 116     macro_expansion_no, macro_expansion_c
 117   };
 118
 119 \f
 120 /* Per architecture (OS/ABI) language information.  */
 121
 122 struct language_arch_info
 123 {
 124   /* Its primitive types.  This is a vector ended by a NULL pointer.
 125      These types can be specified by name in parsing types in
 126      expressions, regardless of whether the program being debugged
 127      actually defines such a type.  */
 128   struct type **primitive_type_vector;
 129   /* Type of elements of strings. */
 130   struct type *string_char_type;
 131
 132   /* Symbol name of type to use as boolean type, if defined.  */
 133   const char *bool_type_symbol;
 134   /* Otherwise, this is the default boolean builtin type.  */
 135   struct type *bool_type_default;
 136 };
 137
 138 /* Structure tying together assorted information about a language.  */
 139
 140 struct language_defn
 141   {
 142     /* Name of the language */
 143
 144     char *la_name;
 145
 146     /* its symtab language-enum (defs.h) */
 147
 148     enum language la_language;
 149
 150     /* Default range checking */
 151
 152     enum range_check la_range_check;
 153
 154     /* Default type checking */
 155
 156     enum type_check la_type_check;
 157
 158     /* Default case sensitivity */
 159     enum case_sensitivity la_case_sensitivity;
 160
 161     /* Multi-dimensional array ordering */
 162     enum array_ordering la_array_ordering;
 163
 164     /* Style of macro expansion, if any, supported by this language.  */
 165     enum macro_expansion la_macro_expansion;
 166
 167     /* Definitions related to expression printing, prefixifying, and
 168        dumping */
 169
 170     const struct exp_descriptor *la_exp_desc;
 171
 172     /* Parser function. */
 173
 174     int (*la_parser) (void);
 175
 176     /* Parser error function */
 177
 178     void (*la_error) (char *);
 179
 180     /* Given an expression *EXPP created by prefixifying the result of
 181        la_parser, perform any remaining processing necessary to complete
 182        its translation.  *EXPP may change; la_post_parser is responsible
 183        for releasing its previous contents, if necessary.  If
 184        VOID_CONTEXT_P, then no value is expected from the expression.  */
 185
 186     void (*la_post_parser) (struct expression ** expp, int void_context_p);
 187
 188     void (*la_printchar) (int ch, struct ui_file * stream);
 189
 190     void (*la_printstr) (struct ui_file * stream, const gdb_byte *string,
 191                          unsigned int length, int width,
 192                          int force_ellipses);
 193
 194     void (*la_emitchar) (int ch, struct ui_file * stream, int quoter);
 195
 196     /* Print a type using syntax appropriate for this language. */
 197
 198     void (*la_print_type) (struct type *, char *, struct ui_file *, int,
 199                            int);
 200
 201     /* Print a typedef using syntax appropriate for this language.
 202        TYPE is the underlying type.  NEW_SYMBOL is the symbol naming
 203        the type.  STREAM is the output stream on which to print.  */
 204
 205     void (*la_print_typedef) (struct type *type, struct symbol *new_symbol,
 206                               struct ui_file *stream);
 207
 208     /* Print a value using syntax appropriate for this language. */
 209
 210     int (*la_val_print) (struct type *, const gdb_byte *, int, CORE_ADDR,
 211                          struct ui_file *, int, int, int,
 212                          enum val_prettyprint);
 213
 214     /* Print a top-level value using syntax appropriate for this language. */
 215
 216     int (*la_value_print) (struct value *, struct ui_file *,
 217                            int, enum val_prettyprint);
 218
 219     /* PC is possibly an unknown languages trampoline.
 220        If that PC falls in a trampoline belonging to this language,
 221        return the address of the first pc in the real function, or 0
 222        if it isn't a language tramp for this language.  */
 223     CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR);
 224
 225     /* Now come some hooks for lookup_symbol.  */
 226
 227     /* If this is non-NULL, specifies the name that of the implicit
 228        local variable that refers to the current object instance.  */
 229
 230     char *la_name_of_this;
 231
 232     /* This is a function that lookup_symbol will call when it gets to
 233        the part of symbol lookup where C looks up static and global
 234        variables.  */
 235
 236     struct symbol *(*la_lookup_symbol_nonlocal) (const char *,
 237                                                  const char *,
 238                                                  const struct block *,
 239                                                  const domain_enum);
 240
 241     /* Find the definition of the type with the given name.  */
 242     struct type *(*la_lookup_transparent_type) (const char *);
 243
 244     /* Return demangled language symbol, or NULL.  */
 245     char *(*la_demangle) (const char *mangled, int options);
 246
 247     /* Return class name of a mangled method name or NULL.  */
 248     char *(*la_class_name_from_physname) (const char *physname);
 249
 250     /* Table for printing expressions */
 251
 252     const struct op_print *la_op_print_tab;
 253
 254     /* Zero if the language has first-class arrays.  True if there are no
 255        array values, and array objects decay to pointers, as in C. */
 256
 257     char c_style_arrays;
 258
 259     /* Index to use for extracting the first element of a string. */
 260     char string_lower_bound;
 261
 262     /* The list of characters forming word boundaries.  */
 263     char *(*la_word_break_characters) (void);
 264
 265     /* Should return a NULL terminated array of all symbols which
 266        are possible completions for TEXT.  WORD is the entire command
 267        on which the completion is being made.  */
 268     char **(*la_make_symbol_completion_list) (char *text, char *word);
 269
 270     /* The per-architecture (OS/ABI) language information.  */
 271     void (*la_language_arch_info) (struct gdbarch *,
 272                                    struct language_arch_info *);
 273
 274     /* Print the index of an element of an array.  */
 275     void (*la_print_array_index) (struct value *index_value,
 276                                   struct ui_file *stream,
 277                                   int format,
 278                                   enum val_prettyprint pretty);
 279
 280     /* Return non-zero if TYPE should be passed (and returned) by
 281        reference at the language level.  */
 282     int (*la_pass_by_reference) (struct type *type);
 283
 284     /* Add fields above this point, so the magic number is always last. */
 285     /* Magic number for compat checking */
 286
 287     long la_magic;
 288
 289   };
 290
 291 #define LANG_MAGIC      910823L
 292
 293 /* Pointer to the language_defn for our current language.  This pointer
 294    always points to *some* valid struct; it can be used without checking
 295    it for validity.
 296
 297    The current language affects expression parsing and evaluation
 298    (FIXME: it might be cleaner to make the evaluation-related stuff
 299    separate exp_opcodes for each different set of semantics.  We
 300    should at least think this through more clearly with respect to
 301    what happens if the language is changed between parsing and
 302    evaluation) and printing of things like types and arrays.  It does
 303    *not* affect symbol-reading-- each source file in a symbol-file has
 304    its own language and we should keep track of that regardless of the
 305    language when symbols are read.  If we want some manual setting for
 306    the language of symbol files (e.g. detecting when ".c" files are
 307    C++), it should be a separate setting from the current_language.  */
 308
 309 extern const struct language_defn *current_language;
 310
 311 /* Pointer to the language_defn expected by the user, e.g. the language
 312    of main(), or the language we last mentioned in a message, or C.  */
 313
 314 extern const struct language_defn *expected_language;
 315
 316 /* language_mode ==
 317    language_mode_auto:   current_language automatically set upon selection
 318    of scope (e.g. stack frame)
 319    language_mode_manual: current_language set only by user.  */
 320
 321 extern enum language_mode
 322   {
 323     language_mode_auto, language_mode_manual
 324   }
 325 language_mode;
 326
 327 struct type *language_bool_type (const struct language_defn *l,
 328                                  struct gdbarch *gdbarch);
 329
 330 struct type *language_string_char_type (const struct language_defn *l,
 331                                         struct gdbarch *gdbarch);
 332
 333 struct type *language_lookup_primitive_type_by_name (const struct language_defn *l,
 334                                                      struct gdbarch *gdbarch,
 335                                                      const char *name);
 336
 337 \f
 338 /* These macros define the behaviour of the expression
 339    evaluator.  */
 340
 341 /* Should we strictly type check expressions? */
 342 #define STRICT_TYPE (type_check != type_check_off)
 343
 344 /* Should we range check values against the domain of their type? */
 345 #define RANGE_CHECK (range_check != range_check_off)
 346
 347 /* "cast" really means conversion */
 348 /* FIXME -- should be a setting in language_defn */
 349 #define CAST_IS_CONVERSION (current_language->la_language == language_c  || \
 350                             current_language->la_language == language_cplus || \
 351                             current_language->la_language == language_objc)
 352
 353 extern void language_info (int);
 354
 355 extern enum language set_language (enum language);
 356 \f
 357
 358 /* This page contains functions that return things that are
 359    specific to languages.  Each of these functions is based on
 360    the current setting of working_lang, which the user sets
 361    with the "set language" command. */
 362
 363 #define LA_PRINT_TYPE(type,varstring,stream,show,level) \
 364   (current_language->la_print_type(type,varstring,stream,show,level))
 365
 366 #define LA_PRINT_TYPEDEF(type,new_symbol,stream) \
 367   (current_language->la_print_typedef(type,new_symbol,stream))
 368
 369 #define LA_VAL_PRINT(type,valaddr,offset,addr,stream,fmt,deref,recurse,pretty) \
 370   (current_language->la_val_print(type,valaddr,offset,addr,stream,fmt,deref, \
 371                                   recurse,pretty))
 372 #define LA_VALUE_PRINT(val,stream,fmt,pretty) \
 373   (current_language->la_value_print(val,stream,fmt,pretty))
 374
 375 #define LA_PRINT_CHAR(ch, stream) \
 376   (current_language->la_printchar(ch, stream))
 377 #define LA_PRINT_STRING(stream, string, length, width, force_ellipses) \
 378   (current_language->la_printstr(stream, string, length, width, force_ellipses))
 379 #define LA_EMIT_CHAR(ch, stream, quoter) \
 380   (current_language->la_emitchar(ch, stream, quoter))
 381
 382 #define LA_PRINT_ARRAY_INDEX(index_value, stream, format, pretty) \
 383   (current_language->la_print_array_index(index_value, stream, format, pretty))
 384
 385 /* Test a character to decide whether it can be printed in literal form
 386    or needs to be printed in another representation.  For example,
 387    in C the literal form of the character with octal value 141 is 'a'
 388    and the "other representation" is '\141'.  The "other representation"
 389    is program language dependent. */
 390
 391 #define PRINT_LITERAL_FORM(c)           \
 392   ((c) >= 0x20                          \
 393    && ((c) < 0x7F || (c) >= 0xA0)       \
 394    && (!sevenbit_strings || (c) < 0x80))
 395
 396 #if 0
 397 /* FIXME: cagney/2000-03-04: This function does not appear to be used.
 398    It can be deleted once 5.0 has been released. */
 399 /* Return a string that contains the hex digits of the number.  No preceeding
 400    "0x" */
 401
 402 extern char *longest_raw_hex_string (LONGEST);
 403 #endif
 404
 405 /* Type predicates */
 406
 407 extern int simple_type (struct type *);
 408
 409 extern int ordered_type (struct type *);
 410
 411 extern int same_type (struct type *, struct type *);
 412
 413 extern int integral_type (struct type *);
 414
 415 extern int numeric_type (struct type *);
 416
 417 extern int character_type (struct type *);
 418
 419 extern int boolean_type (struct type *);
 420
 421 extern int float_type (struct type *);
 422
 423 extern int pointer_type (struct type *);
 424
 425 extern int structured_type (struct type *);
 426
 427 /* Checks Binary and Unary operations for semantic type correctness */
 428 /* FIXME:  Does not appear to be used */
 429 #define unop_type_check(v,o) binop_type_check((v),NULL,(o))
 430
 431 extern void binop_type_check (struct value *, struct value *, int);
 432
 433 /* Error messages */
 434
 435 extern void type_error (const char *, ...) ATTR_FORMAT (printf, 1, 2);
 436
 437 extern void range_error (const char *, ...) ATTR_FORMAT (printf, 1, 2);
 438
 439 /* Data:  Does this value represent "truth" to the current language?  */
 440
 441 extern int value_true (struct value *);
 442
 443 /* Misc:  The string representing a particular enum language.  */
 444
 445 extern enum language language_enum (char *str);
 446
 447 extern const struct language_defn *language_def (enum language);
 448
 449 extern char *language_str (enum language);
 450
 451 /* Add a language to the set known by GDB (at initialization time).  */
 452
 453 extern void add_language (const struct language_defn *);
 454
 455 extern enum language get_frame_language (void); /* In stack.c */
 456
 457 /* Check for a language-specific trampoline. */
 458
 459 extern CORE_ADDR skip_language_trampoline (struct frame_info *, CORE_ADDR pc);
 460
 461 /* Return demangled language symbol, or NULL.  */
 462 extern char *language_demangle (const struct language_defn *current_language,
 463                                 const char *mangled, int options);
 464
 465 /* Return class name from physname, or NULL.  */
 466 extern char *language_class_name_from_physname (const struct language_defn *,
 467                                                 const char *physname);
 468
 469 /* Splitting strings into words.  */
 470 extern char *default_word_break_characters (void);
 471
 472 /* Print the index of an array element using the C99 syntax.  */
 473 extern void default_print_array_index (struct value *index_value,
 474                                        struct ui_file *stream,
 475                                        int format,
 476                                        enum val_prettyprint pretty);
 477
 478 /* Return non-zero if TYPE should be passed (and returned) by
 479    reference at the language level.  */
 480 int language_pass_by_reference (struct type *type);
 481
 482 /* Return zero; by default, types are passed by value at the language
 483    level.  The target ABI may pass or return some structs by reference
 484    independent of this.  */
 485 int default_pass_by_reference (struct type *type);
 486
 487 /* The default implementation of la_print_typedef.  */
 488 void default_print_typedef (struct type *type, struct symbol *new_symbol,
 489                             struct ui_file *stream);
 490
 491 #endif /* defined (LANGUAGE_H) */