gdb/f-lang.h

   1 /* Fortran language support definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 1992-2023 Free Software Foundation, Inc.
   4
   5    Contributed by Motorola.  Adapted from the C definitions by Farooq Butt
   6    (fmbutt@engage.sps.mot.com).
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef F_LANG_H
  24 #define F_LANG_H
  25
  26 #include "language.h"
  27 #include "valprint.h"
  28
  29 struct type_print_options;
  30 struct parser_state;
  31
  32 /* Class representing the Fortran language.  */
  33
  34 class f_language : public language_defn
  35 {
  36 public:
  37   f_language ()
  38     : language_defn (language_fortran)
  39   { /* Nothing.  */ }
  40
  41   /* See language.h.  */
  42
  43   const char *name () const override
  44   { return "fortran"; }
  45
  46   /* See language.h.  */
  47
  48   const char *natural_name () const override
  49   { return "Fortran"; }
  50
  51   /* See language.h.  */
  52
  53   const std::vector<const char *> &filename_extensions () const override
  54   {
  55     static const std::vector<const char *> extensions = {
  56       ".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
  57       ".f90", ".F90", ".f95", ".F95", ".f03", ".F03", ".f08", ".F08"
  58     };
  59     return extensions;
  60   }
  61
  62   /* See language.h.  */
  63   void print_array_index (struct type *index_type,
  64                           LONGEST index,
  65                           struct ui_file *stream,
  66                           const value_print_options *options) const override;
  67
  68   /* See language.h.  */
  69   void language_arch_info (struct gdbarch *gdbarch,
  70                            struct language_arch_info *lai) const override;
  71
  72   /* See language.h.  */
  73   unsigned int search_name_hash (const char *name) const override;
  74
  75   /* See language.h.  */
  76
  77   gdb::unique_xmalloc_ptr<char> demangle_symbol (const char *mangled,
  78                                                  int options) const override
  79   {
  80       /* We could support demangling here to provide module namespaces
  81          also for inferiors with only minimal symbol table (ELF symbols).
  82          Just the mangling standard is not standardized across compilers
  83          and there is no DW_AT_producer available for inferiors with only
  84          the ELF symbols to check the mangling kind.  */
  85     return nullptr;
  86   }
  87
  88   /* See language.h.  */
  89
  90   void print_type (struct type *type, const char *varstring,
  91                    struct ui_file *stream, int show, int level,
  92                    const struct type_print_options *flags) const override;
  93
  94   /* See language.h.  This just returns default set of word break
  95      characters but with the modules separator `::' removed.  */
  96
  97   const char *word_break_characters (void) const override
  98   {
  99     static char *retval;
 100
 101     if (!retval)
 102       {
 103         char *s;
 104
 105         retval = xstrdup (language_defn::word_break_characters ());
 106         s = strchr (retval, ':');
 107         if (s)
 108           {
 109             char *last_char = &s[strlen (s) - 1];
 110
 111             *s = *last_char;
 112             *last_char = 0;
 113           }
 114       }
 115     return retval;
 116   }
 117
 118
 119   /* See language.h.  */
 120
 121   void collect_symbol_completion_matches (completion_tracker &tracker,
 122                                           complete_symbol_mode mode,
 123                                           symbol_name_match_type name_match_type,
 124                                           const char *text, const char *word,
 125                                           enum type_code code) const override
 126   {
 127     /* Consider the modules separator :: as a valid symbol name character
 128        class.  */
 129     default_collect_symbol_completion_matches_break_on (tracker, mode,
 130                                                         name_match_type,
 131                                                         text, word, ":",
 132                                                         code);
 133   }
 134
 135   /* See language.h.  */
 136
 137   void value_print_inner
 138         (struct value *val, struct ui_file *stream, int recurse,
 139          const struct value_print_options *options) const override;
 140
 141   /* See language.h.  */
 142
 143   struct block_symbol lookup_symbol_nonlocal
 144         (const char *name, const struct block *block,
 145          const domain_enum domain) const override;
 146
 147   /* See language.h.  */
 148
 149   int parser (struct parser_state *ps) const override;
 150
 151   /* See language.h.  */
 152
 153   void emitchar (int ch, struct type *chtype,
 154                  struct ui_file *stream, int quoter) const override
 155   {
 156     const char *encoding = get_encoding (chtype);
 157     generic_emit_char (ch, chtype, stream, quoter, encoding);
 158   }
 159
 160   /* See language.h.  */
 161
 162   void printchar (int ch, struct type *chtype,
 163                   struct ui_file *stream) const override
 164   {
 165     gdb_puts ("'", stream);
 166     emitchar (ch, chtype, stream, '\'');
 167     gdb_puts ("'", stream);
 168   }
 169
 170   /* See language.h.  */
 171
 172   void printstr (struct ui_file *stream, struct type *elttype,
 173                  const gdb_byte *string, unsigned int length,
 174                  const char *encoding, int force_ellipses,
 175                  const struct value_print_options *options) const override
 176   {
 177     const char *type_encoding = get_encoding (elttype);
 178
 179     if (elttype->length () == 4)
 180       gdb_puts ("4_", stream);
 181
 182     if (!encoding || !*encoding)
 183       encoding = type_encoding;
 184
 185     generic_printstr (stream, elttype, string, length, encoding,
 186                       force_ellipses, '\'', 0, options);
 187   }
 188
 189   /* See language.h.  */
 190
 191   void print_typedef (struct type *type, struct symbol *new_symbol,
 192                       struct ui_file *stream) const override;
 193
 194   /* See language.h.  */
 195
 196   bool is_string_type_p (struct type *type) const override
 197   {
 198     type = check_typedef (type);
 199     return (type->code () == TYPE_CODE_STRING
 200             || (type->code () == TYPE_CODE_ARRAY
 201                 && type->target_type ()->code () == TYPE_CODE_CHAR));
 202   }
 203
 204   /* See language.h.  */
 205
 206   struct value *value_string (struct gdbarch *gdbarch,
 207                               const char *ptr, ssize_t len) const override;
 208
 209   /* See language.h.  */
 210
 211   const char *struct_too_deep_ellipsis () const override
 212   { return "(...)"; }
 213
 214   /* See language.h.  */
 215
 216   bool c_style_arrays_p () const override
 217   { return false; }
 218
 219   /* See language.h.  */
 220
 221   bool range_checking_on_by_default () const override
 222   { return true; }
 223
 224   /* See language.h.  */
 225
 226   enum case_sensitivity case_sensitivity () const override
 227   { return case_sensitive_off; }
 228
 229   /* See language.h.  */
 230
 231   enum array_ordering array_ordering () const override
 232   { return array_column_major; }
 233
 234 protected:
 235
 236   /* See language.h.  */
 237
 238   symbol_name_matcher_ftype *get_symbol_name_matcher_inner
 239         (const lookup_name_info &lookup_name) const override;
 240
 241 private:
 242   /* Return the encoding that should be used for the character type
 243      TYPE.  */
 244
 245   static const char *get_encoding (struct type *type);
 246
 247   /* Print any asterisks or open-parentheses needed before the variable
 248      name (to describe its type).
 249
 250      On outermost call, pass 0 for PASSED_A_PTR.
 251      On outermost call, SHOW > 0 means should ignore
 252      any typename for TYPE and show its details.
 253      SHOW is always zero on recursive calls.  */
 254
 255   void f_type_print_varspec_prefix (struct type *type,
 256                                     struct ui_file * stream,
 257                                     int show, int passed_a_ptr) const;
 258
 259   /* Print any array sizes, function arguments or close parentheses needed
 260      after the variable name (to describe its type).  Args work like
 261      c_type_print_varspec_prefix.
 262
 263      PRINT_RANK_ONLY is true when TYPE is an array which should be printed
 264      without the upper and lower bounds being specified, this will occur
 265      when the array is not allocated or not associated and so there are no
 266      known upper or lower bounds.  */
 267
 268   void f_type_print_varspec_suffix (struct type *type,
 269                                     struct ui_file *stream,
 270                                     int show, int passed_a_ptr,
 271                                     int demangled_args,
 272                                     int arrayprint_recurse_level,
 273                                     bool print_rank_only) const;
 274
 275   /* If TYPE is an extended type, then print out derivation information.
 276
 277      A typical output could look like this:
 278      "Type, extends(point) :: waypoint"
 279      "    Type point :: point"
 280      "    real(kind=4) :: angle"
 281      "End Type waypoint".  */
 282
 283   void f_type_print_derivation_info (struct type *type,
 284                                      struct ui_file *stream) const;
 285
 286   /* Print the name of the type (or the ultimate pointer target, function
 287      value or array element), or the description of a structure or union.
 288
 289      SHOW nonzero means don't print this type as just its name;
 290      show its real definition even if it has a name.
 291      SHOW zero means print just typename or struct tag if there is one
 292      SHOW negative means abbreviate structure elements.
 293      SHOW is decremented for printing of structure elements.
 294
 295      LEVEL is the depth to indent by.  We increase it for some recursive
 296      calls.  */
 297
 298   void f_type_print_base (struct type *type, struct ui_file *stream, int show,
 299                           int level) const;
 300 };
 301
 302 /* Language-specific data structures */
 303
 304 /* A common block.  */
 305
 306 struct common_block
 307 {
 308   /* The number of entries in the block.  */
 309   size_t n_entries;
 310
 311   /* The contents of the block, allocated using the struct hack.  All
 312      pointers in the array are non-NULL.  */
 313   struct symbol *contents[1];
 314 };
 315
 316 extern LONGEST f77_get_upperbound (struct type *);
 317
 318 extern LONGEST f77_get_lowerbound (struct type *);
 319
 320 extern int calc_f77_array_dims (struct type *);
 321
 322 /* Fortran (F77) types */
 323
 324 struct builtin_f_type
 325 {
 326   struct type *builtin_character = nullptr;
 327   struct type *builtin_integer_s1 = nullptr;
 328   struct type *builtin_integer_s2 = nullptr;
 329   struct type *builtin_integer = nullptr;
 330   struct type *builtin_integer_s8 = nullptr;
 331   struct type *builtin_logical_s1 = nullptr;
 332   struct type *builtin_logical_s2 = nullptr;
 333   struct type *builtin_logical = nullptr;
 334   struct type *builtin_logical_s8 = nullptr;
 335   struct type *builtin_real = nullptr;
 336   struct type *builtin_real_s8 = nullptr;
 337   struct type *builtin_real_s16 = nullptr;
 338   struct type *builtin_complex = nullptr;
 339   struct type *builtin_complex_s8 = nullptr;
 340   struct type *builtin_complex_s16 = nullptr;
 341   struct type *builtin_void = nullptr;
 342 };
 343
 344 /* Return the Fortran type table for the specified architecture.  */
 345 extern const struct builtin_f_type *builtin_f_type (struct gdbarch *gdbarch);
 346
 347 /* Ensures that function argument TYPE is appropriate to inform the debugger
 348    that ARG should be passed as a pointer.  Returns the potentially updated
 349    argument type.
 350
 351    If ARG is of type pointer then the type of ARG is returned, otherwise
 352    TYPE is returned untouched.
 353
 354    This function exists to augment the types of Fortran function call
 355    parameters to be pointers to the reported value, when the corresponding ARG
 356    has also been wrapped in a pointer (by fortran_argument_convert).  This
 357    informs the debugger that these arguments should be passed as a pointer
 358    rather than as the pointed to type.  */
 359
 360 extern struct type *fortran_preserve_arg_pointer (struct value *arg,
 361                                                   struct type *type);
 362
 363 /* Fortran arrays can have a negative stride.  When this happens it is
 364    often the case that the base address for an object is not the lowest
 365    address occupied by that object.  For example, an array slice (10:1:-1)
 366    will be encoded with lower bound 1, upper bound 10, a stride of
 367    -ELEMENT_SIZE, and have a base address pointer that points at the
 368    element with the highest address in memory.
 369
 370    This really doesn't play well with our current model of value contents,
 371    but could easily require a significant update in order to be supported
 372    "correctly".
 373
 374    For now, we manually force the base address to be the lowest addressed
 375    element here.  Yes, this will break some things, but it fixes other
 376    things.  The hope is that it fixes more than it breaks.  */
 377
 378 extern CORE_ADDR fortran_adjust_dynamic_array_base_address_hack
 379         (struct type *type, CORE_ADDR address);
 380
 381 #endif /* F_LANG_H */