gdb/f-lang.c

   1 /* Fortran language support routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1993-2020 Free Software Foundation, Inc.
   4
   5    Contributed by Motorola.  Adapted from the C parser 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 #include "defs.h"
  24 #include "symtab.h"
  25 #include "gdbtypes.h"
  26 #include "expression.h"
  27 #include "parser-defs.h"
  28 #include "language.h"
  29 #include "varobj.h"
  30 #include "gdbcore.h"
  31 #include "f-lang.h"
  32 #include "valprint.h"
  33 #include "value.h"
  34 #include "cp-support.h"
  35 #include "charset.h"
  36 #include "c-lang.h"
  37 #include "target-float.h"
  38 #include "gdbarch.h"
  39
  40 #include <math.h>
  41
  42 /* Local functions */
  43
  44 /* Return the encoding that should be used for the character type
  45    TYPE.  */
  46
  47 static const char *
  48 f_get_encoding (struct type *type)
  49 {
  50   const char *encoding;
  51
  52   switch (TYPE_LENGTH (type))
  53     {
  54     case 1:
  55       encoding = target_charset (get_type_arch (type));
  56       break;
  57     case 4:
  58       if (type_byte_order (type) == BFD_ENDIAN_BIG)
  59         encoding = "UTF-32BE";
  60       else
  61         encoding = "UTF-32LE";
  62       break;
  63
  64     default:
  65       error (_("unrecognized character type"));
  66     }
  67
  68   return encoding;
  69 }
  70
  71 \f
  72
  73 /* Table of operators and their precedences for printing expressions.  */
  74
  75 static const struct op_print f_op_print_tab[] =
  76 {
  77   {"+", BINOP_ADD, PREC_ADD, 0},
  78   {"+", UNOP_PLUS, PREC_PREFIX, 0},
  79   {"-", BINOP_SUB, PREC_ADD, 0},
  80   {"-", UNOP_NEG, PREC_PREFIX, 0},
  81   {"*", BINOP_MUL, PREC_MUL, 0},
  82   {"/", BINOP_DIV, PREC_MUL, 0},
  83   {"DIV", BINOP_INTDIV, PREC_MUL, 0},
  84   {"MOD", BINOP_REM, PREC_MUL, 0},
  85   {"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
  86   {".OR.", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
  87   {".AND.", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
  88   {".NOT.", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
  89   {".EQ.", BINOP_EQUAL, PREC_EQUAL, 0},
  90   {".NE.", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  91   {".LE.", BINOP_LEQ, PREC_ORDER, 0},
  92   {".GE.", BINOP_GEQ, PREC_ORDER, 0},
  93   {".GT.", BINOP_GTR, PREC_ORDER, 0},
  94   {".LT.", BINOP_LESS, PREC_ORDER, 0},
  95   {"**", UNOP_IND, PREC_PREFIX, 0},
  96   {"@", BINOP_REPEAT, PREC_REPEAT, 0},
  97   {NULL, OP_NULL, PREC_REPEAT, 0}
  98 };
  99 \f
 100 enum f_primitive_types {
 101   f_primitive_type_character,
 102   f_primitive_type_logical,
 103   f_primitive_type_logical_s1,
 104   f_primitive_type_logical_s2,
 105   f_primitive_type_logical_s8,
 106   f_primitive_type_integer,
 107   f_primitive_type_integer_s2,
 108   f_primitive_type_real,
 109   f_primitive_type_real_s8,
 110   f_primitive_type_real_s16,
 111   f_primitive_type_complex_s8,
 112   f_primitive_type_complex_s16,
 113   f_primitive_type_void,
 114   nr_f_primitive_types
 115 };
 116
 117 /* Special expression evaluation cases for Fortran.  */
 118
 119 static struct value *
 120 evaluate_subexp_f (struct type *expect_type, struct expression *exp,
 121                    int *pos, enum noside noside)
 122 {
 123   struct value *arg1 = NULL, *arg2 = NULL;
 124   enum exp_opcode op;
 125   int pc;
 126   struct type *type;
 127
 128   pc = *pos;
 129   *pos += 1;
 130   op = exp->elts[pc].opcode;
 131
 132   switch (op)
 133     {
 134     default:
 135       *pos -= 1;
 136       return evaluate_subexp_standard (expect_type, exp, pos, noside);
 137
 138     case UNOP_ABS:
 139       arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
 140       if (noside == EVAL_SKIP)
 141         return eval_skip_value (exp);
 142       type = value_type (arg1);
 143       switch (type->code ())
 144         {
 145         case TYPE_CODE_FLT:
 146           {
 147             double d
 148               = fabs (target_float_to_host_double (value_contents (arg1),
 149                                                    value_type (arg1)));
 150             return value_from_host_double (type, d);
 151           }
 152         case TYPE_CODE_INT:
 153           {
 154             LONGEST l = value_as_long (arg1);
 155             l = llabs (l);
 156             return value_from_longest (type, l);
 157           }
 158         }
 159       error (_("ABS of type %s not supported"), TYPE_SAFE_NAME (type));
 160
 161     case BINOP_MOD:
 162       arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
 163       arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
 164       if (noside == EVAL_SKIP)
 165         return eval_skip_value (exp);
 166       type = value_type (arg1);
 167       if (type->code () != value_type (arg2)->code ())
 168         error (_("non-matching types for parameters to MOD ()"));
 169       switch (type->code ())
 170         {
 171         case TYPE_CODE_FLT:
 172           {
 173             double d1
 174               = target_float_to_host_double (value_contents (arg1),
 175                                              value_type (arg1));
 176             double d2
 177               = target_float_to_host_double (value_contents (arg2),
 178                                              value_type (arg2));
 179             double d3 = fmod (d1, d2);
 180             return value_from_host_double (type, d3);
 181           }
 182         case TYPE_CODE_INT:
 183           {
 184             LONGEST v1 = value_as_long (arg1);
 185             LONGEST v2 = value_as_long (arg2);
 186             if (v2 == 0)
 187               error (_("calling MOD (N, 0) is undefined"));
 188             LONGEST v3 = v1 - (v1 / v2) * v2;
 189             return value_from_longest (value_type (arg1), v3);
 190           }
 191         }
 192       error (_("MOD of type %s not supported"), TYPE_SAFE_NAME (type));
 193
 194     case UNOP_FORTRAN_CEILING:
 195       {
 196         arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
 197         if (noside == EVAL_SKIP)
 198           return eval_skip_value (exp);
 199         type = value_type (arg1);
 200         if (type->code () != TYPE_CODE_FLT)
 201           error (_("argument to CEILING must be of type float"));
 202         double val
 203           = target_float_to_host_double (value_contents (arg1),
 204                                          value_type (arg1));
 205         val = ceil (val);
 206         return value_from_host_double (type, val);
 207       }
 208
 209     case UNOP_FORTRAN_FLOOR:
 210       {
 211         arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
 212         if (noside == EVAL_SKIP)
 213           return eval_skip_value (exp);
 214         type = value_type (arg1);
 215         if (type->code () != TYPE_CODE_FLT)
 216           error (_("argument to FLOOR must be of type float"));
 217         double val
 218           = target_float_to_host_double (value_contents (arg1),
 219                                          value_type (arg1));
 220         val = floor (val);
 221         return value_from_host_double (type, val);
 222       }
 223
 224     case BINOP_FORTRAN_MODULO:
 225       {
 226         arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
 227         arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
 228         if (noside == EVAL_SKIP)
 229           return eval_skip_value (exp);
 230         type = value_type (arg1);
 231         if (type->code () != value_type (arg2)->code ())
 232           error (_("non-matching types for parameters to MODULO ()"));
 233         /* MODULO(A, P) = A - FLOOR (A / P) * P */
 234         switch (type->code ())
 235           {
 236           case TYPE_CODE_INT:
 237             {
 238               LONGEST a = value_as_long (arg1);
 239               LONGEST p = value_as_long (arg2);
 240               LONGEST result = a - (a / p) * p;
 241               if (result != 0 && (a < 0) != (p < 0))
 242                 result += p;
 243               return value_from_longest (value_type (arg1), result);
 244             }
 245           case TYPE_CODE_FLT:
 246             {
 247               double a
 248                 = target_float_to_host_double (value_contents (arg1),
 249                                                value_type (arg1));
 250               double p
 251                 = target_float_to_host_double (value_contents (arg2),
 252                                                value_type (arg2));
 253               double result = fmod (a, p);
 254               if (result != 0 && (a < 0.0) != (p < 0.0))
 255                 result += p;
 256               return value_from_host_double (type, result);
 257             }
 258           }
 259         error (_("MODULO of type %s not supported"), TYPE_SAFE_NAME (type));
 260       }
 261
 262     case BINOP_FORTRAN_CMPLX:
 263       arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
 264       arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
 265       if (noside == EVAL_SKIP)
 266         return eval_skip_value (exp);
 267       type = builtin_f_type(exp->gdbarch)->builtin_complex_s16;
 268       return value_literal_complex (arg1, arg2, type);
 269
 270     case UNOP_FORTRAN_KIND:
 271       arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
 272       type = value_type (arg1);
 273
 274       switch (type->code ())
 275         {
 276           case TYPE_CODE_STRUCT:
 277           case TYPE_CODE_UNION:
 278           case TYPE_CODE_MODULE:
 279           case TYPE_CODE_FUNC:
 280             error (_("argument to kind must be an intrinsic type"));
 281         }
 282
 283       if (!TYPE_TARGET_TYPE (type))
 284         return value_from_longest (builtin_type (exp->gdbarch)->builtin_int,
 285                                    TYPE_LENGTH (type));
 286       return value_from_longest (builtin_type (exp->gdbarch)->builtin_int,
 287                                  TYPE_LENGTH (TYPE_TARGET_TYPE (type)));
 288     }
 289
 290   /* Should be unreachable.  */
 291   return nullptr;
 292 }
 293
 294 /* Special expression lengths for Fortran.  */
 295
 296 static void
 297 operator_length_f (const struct expression *exp, int pc, int *oplenp,
 298                    int *argsp)
 299 {
 300   int oplen = 1;
 301   int args = 0;
 302
 303   switch (exp->elts[pc - 1].opcode)
 304     {
 305     default:
 306       operator_length_standard (exp, pc, oplenp, argsp);
 307       return;
 308
 309     case UNOP_FORTRAN_KIND:
 310     case UNOP_FORTRAN_FLOOR:
 311     case UNOP_FORTRAN_CEILING:
 312       oplen = 1;
 313       args = 1;
 314       break;
 315
 316     case BINOP_FORTRAN_CMPLX:
 317     case BINOP_FORTRAN_MODULO:
 318       oplen = 1;
 319       args = 2;
 320       break;
 321     }
 322
 323   *oplenp = oplen;
 324   *argsp = args;
 325 }
 326
 327 /* Helper for PRINT_SUBEXP_F.  Arguments are as for PRINT_SUBEXP_F, except
 328    the extra argument NAME which is the text that should be printed as the
 329    name of this operation.  */
 330
 331 static void
 332 print_unop_subexp_f (struct expression *exp, int *pos,
 333                      struct ui_file *stream, enum precedence prec,
 334                      const char *name)
 335 {
 336   (*pos)++;
 337   fprintf_filtered (stream, "%s(", name);
 338   print_subexp (exp, pos, stream, PREC_SUFFIX);
 339   fputs_filtered (")", stream);
 340 }
 341
 342 /* Helper for PRINT_SUBEXP_F.  Arguments are as for PRINT_SUBEXP_F, except
 343    the extra argument NAME which is the text that should be printed as the
 344    name of this operation.  */
 345
 346 static void
 347 print_binop_subexp_f (struct expression *exp, int *pos,
 348                       struct ui_file *stream, enum precedence prec,
 349                       const char *name)
 350 {
 351   (*pos)++;
 352   fprintf_filtered (stream, "%s(", name);
 353   print_subexp (exp, pos, stream, PREC_SUFFIX);
 354   fputs_filtered (",", stream);
 355   print_subexp (exp, pos, stream, PREC_SUFFIX);
 356   fputs_filtered (")", stream);
 357 }
 358
 359 /* Special expression printing for Fortran.  */
 360
 361 static void
 362 print_subexp_f (struct expression *exp, int *pos,
 363                 struct ui_file *stream, enum precedence prec)
 364 {
 365   int pc = *pos;
 366   enum exp_opcode op = exp->elts[pc].opcode;
 367
 368   switch (op)
 369     {
 370     default:
 371       print_subexp_standard (exp, pos, stream, prec);
 372       return;
 373
 374     case UNOP_FORTRAN_KIND:
 375       print_unop_subexp_f (exp, pos, stream, prec, "KIND");
 376       return;
 377
 378     case UNOP_FORTRAN_FLOOR:
 379       print_unop_subexp_f (exp, pos, stream, prec, "FLOOR");
 380       return;
 381
 382     case UNOP_FORTRAN_CEILING:
 383       print_unop_subexp_f (exp, pos, stream, prec, "CEILING");
 384       return;
 385
 386     case BINOP_FORTRAN_CMPLX:
 387       print_binop_subexp_f (exp, pos, stream, prec, "CMPLX");
 388       return;
 389
 390     case BINOP_FORTRAN_MODULO:
 391       print_binop_subexp_f (exp, pos, stream, prec, "MODULO");
 392       return;
 393     }
 394 }
 395
 396 /* Special expression names for Fortran.  */
 397
 398 static const char *
 399 op_name_f (enum exp_opcode opcode)
 400 {
 401   switch (opcode)
 402     {
 403     default:
 404       return op_name_standard (opcode);
 405
 406 #define OP(name)        \
 407     case name:          \
 408       return #name ;
 409 #include "fortran-operator.def"
 410 #undef OP
 411     }
 412 }
 413
 414 /* Special expression dumping for Fortran.  */
 415
 416 static int
 417 dump_subexp_body_f (struct expression *exp,
 418                     struct ui_file *stream, int elt)
 419 {
 420   int opcode = exp->elts[elt].opcode;
 421   int oplen, nargs, i;
 422
 423   switch (opcode)
 424     {
 425     default:
 426       return dump_subexp_body_standard (exp, stream, elt);
 427
 428     case UNOP_FORTRAN_KIND:
 429     case UNOP_FORTRAN_FLOOR:
 430     case UNOP_FORTRAN_CEILING:
 431     case BINOP_FORTRAN_CMPLX:
 432     case BINOP_FORTRAN_MODULO:
 433       operator_length_f (exp, (elt + 1), &oplen, &nargs);
 434       break;
 435     }
 436
 437   elt += oplen;
 438   for (i = 0; i < nargs; i += 1)
 439     elt = dump_subexp (exp, stream, elt);
 440
 441   return elt;
 442 }
 443
 444 /* Special expression checking for Fortran.  */
 445
 446 static int
 447 operator_check_f (struct expression *exp, int pos,
 448                   int (*objfile_func) (struct objfile *objfile,
 449                                        void *data),
 450                   void *data)
 451 {
 452   const union exp_element *const elts = exp->elts;
 453
 454   switch (elts[pos].opcode)
 455     {
 456     case UNOP_FORTRAN_KIND:
 457     case UNOP_FORTRAN_FLOOR:
 458     case UNOP_FORTRAN_CEILING:
 459     case BINOP_FORTRAN_CMPLX:
 460     case BINOP_FORTRAN_MODULO:
 461       /* Any references to objfiles are held in the arguments to this
 462          expression, not within the expression itself, so no additional
 463          checking is required here, the outer expression iteration code
 464          will take care of checking each argument.  */
 465       break;
 466
 467     default:
 468       return operator_check_standard (exp, pos, objfile_func, data);
 469     }
 470
 471   return 0;
 472 }
 473
 474 static const char *f_extensions[] =
 475 {
 476   ".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
 477   ".f90", ".F90", ".f95", ".F95", ".f03", ".F03", ".f08", ".F08",
 478   NULL
 479 };
 480
 481 /* Expression processing for Fortran.  */
 482 static const struct exp_descriptor exp_descriptor_f =
 483 {
 484   print_subexp_f,
 485   operator_length_f,
 486   operator_check_f,
 487   op_name_f,
 488   dump_subexp_body_f,
 489   evaluate_subexp_f
 490 };
 491
 492 /* Constant data that describes the Fortran language.  */
 493
 494 extern const struct language_data f_language_data =
 495 {
 496   "fortran",
 497   "Fortran",
 498   language_fortran,
 499   range_check_on,
 500   case_sensitive_off,
 501   array_column_major,
 502   macro_expansion_no,
 503   f_extensions,
 504   &exp_descriptor_f,
 505   NULL,                         /* name_of_this */
 506   false,                        /* la_store_sym_names_in_linkage_form_p */
 507   f_op_print_tab,               /* expression operators for printing */
 508   0,                            /* arrays are first-class (not c-style) */
 509   1,                            /* String lower bound */
 510   &default_varobj_ops,
 511   "(...)"                       /* la_struct_too_deep_ellipsis */
 512 };
 513
 514 /* Class representing the Fortran language.  */
 515
 516 class f_language : public language_defn
 517 {
 518 public:
 519   f_language ()
 520     : language_defn (language_fortran, f_language_data)
 521   { /* Nothing.  */ }
 522
 523   /* See language.h.  */
 524   void language_arch_info (struct gdbarch *gdbarch,
 525                            struct language_arch_info *lai) const override
 526   {
 527     const struct builtin_f_type *builtin = builtin_f_type (gdbarch);
 528
 529     lai->string_char_type = builtin->builtin_character;
 530     lai->primitive_type_vector
 531       = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_f_primitive_types + 1,
 532                                 struct type *);
 533
 534     lai->primitive_type_vector [f_primitive_type_character]
 535       = builtin->builtin_character;
 536     lai->primitive_type_vector [f_primitive_type_logical]
 537       = builtin->builtin_logical;
 538     lai->primitive_type_vector [f_primitive_type_logical_s1]
 539       = builtin->builtin_logical_s1;
 540     lai->primitive_type_vector [f_primitive_type_logical_s2]
 541       = builtin->builtin_logical_s2;
 542     lai->primitive_type_vector [f_primitive_type_logical_s8]
 543       = builtin->builtin_logical_s8;
 544     lai->primitive_type_vector [f_primitive_type_real]
 545       = builtin->builtin_real;
 546     lai->primitive_type_vector [f_primitive_type_real_s8]
 547       = builtin->builtin_real_s8;
 548     lai->primitive_type_vector [f_primitive_type_real_s16]
 549       = builtin->builtin_real_s16;
 550     lai->primitive_type_vector [f_primitive_type_complex_s8]
 551       = builtin->builtin_complex_s8;
 552     lai->primitive_type_vector [f_primitive_type_complex_s16]
 553       = builtin->builtin_complex_s16;
 554     lai->primitive_type_vector [f_primitive_type_void]
 555       = builtin->builtin_void;
 556
 557     lai->bool_type_symbol = "logical";
 558     lai->bool_type_default = builtin->builtin_logical_s2;
 559   }
 560
 561   /* See language.h.  */
 562   unsigned int search_name_hash (const char *name) const override
 563   {
 564     return cp_search_name_hash (name);
 565   }
 566
 567   /* See language.h.  */
 568
 569   char *demangle (const char *mangled, int options) const override
 570   {
 571       /* We could support demangling here to provide module namespaces
 572          also for inferiors with only minimal symbol table (ELF symbols).
 573          Just the mangling standard is not standardized across compilers
 574          and there is no DW_AT_producer available for inferiors with only
 575          the ELF symbols to check the mangling kind.  */
 576     return nullptr;
 577   }
 578
 579   /* See language.h.  */
 580
 581   void print_type (struct type *type, const char *varstring,
 582                    struct ui_file *stream, int show, int level,
 583                    const struct type_print_options *flags) const override
 584   {
 585     f_print_type (type, varstring, stream, show, level, flags);
 586   }
 587
 588   /* See language.h.  This just returns default set of word break
 589      characters but with the modules separator `::' removed.  */
 590
 591   const char *word_break_characters (void) const override
 592   {
 593     static char *retval;
 594
 595     if (!retval)
 596       {
 597         char *s;
 598
 599         retval = xstrdup (language_defn::word_break_characters ());
 600         s = strchr (retval, ':');
 601         if (s)
 602           {
 603             char *last_char = &s[strlen (s) - 1];
 604
 605             *s = *last_char;
 606             *last_char = 0;
 607           }
 608       }
 609     return retval;
 610   }
 611
 612
 613   /* See language.h.  */
 614
 615   void collect_symbol_completion_matches (completion_tracker &tracker,
 616                                           complete_symbol_mode mode,
 617                                           symbol_name_match_type name_match_type,
 618                                           const char *text, const char *word,
 619                                           enum type_code code) const override
 620   {
 621     /* Consider the modules separator :: as a valid symbol name character
 622        class.  */
 623     default_collect_symbol_completion_matches_break_on (tracker, mode,
 624                                                         name_match_type,
 625                                                         text, word, ":",
 626                                                         code);
 627   }
 628
 629   /* See language.h.  */
 630
 631   void value_print_inner
 632         (struct value *val, struct ui_file *stream, int recurse,
 633          const struct value_print_options *options) const override
 634   {
 635     return f_value_print_inner (val, stream, recurse, options);
 636   }
 637
 638   /* See language.h.  */
 639
 640   struct block_symbol lookup_symbol_nonlocal
 641         (const char *name, const struct block *block,
 642          const domain_enum domain) const override
 643   {
 644     return cp_lookup_symbol_nonlocal (this, name, block, domain);
 645   }
 646
 647   /* See language.h.  */
 648
 649   int parser (struct parser_state *ps) const override
 650   {
 651     return f_parse (ps);
 652   }
 653
 654   /* See language.h.  */
 655
 656   void emitchar (int ch, struct type *chtype,
 657                  struct ui_file *stream, int quoter) const override
 658   {
 659     const char *encoding = f_get_encoding (chtype);
 660     generic_emit_char (ch, chtype, stream, quoter, encoding);
 661   }
 662
 663   /* See language.h.  */
 664
 665   void printchar (int ch, struct type *chtype,
 666                   struct ui_file *stream) const override
 667   {
 668     fputs_filtered ("'", stream);
 669     LA_EMIT_CHAR (ch, chtype, stream, '\'');
 670     fputs_filtered ("'", stream);
 671   }
 672
 673   /* See language.h.  */
 674
 675   void printstr (struct ui_file *stream, struct type *elttype,
 676                  const gdb_byte *string, unsigned int length,
 677                  const char *encoding, int force_ellipses,
 678                  const struct value_print_options *options) const override
 679   {
 680     const char *type_encoding = f_get_encoding (elttype);
 681
 682     if (TYPE_LENGTH (elttype) == 4)
 683       fputs_filtered ("4_", stream);
 684
 685     if (!encoding || !*encoding)
 686       encoding = type_encoding;
 687
 688     generic_printstr (stream, elttype, string, length, encoding,
 689                       force_ellipses, '\'', 0, options);
 690   }
 691
 692   /* See language.h.  */
 693
 694   void print_typedef (struct type *type, struct symbol *new_symbol,
 695                       struct ui_file *stream) const override
 696   {
 697     f_print_typedef (type, new_symbol, stream);
 698   }
 699
 700   /* See language.h.  */
 701
 702   bool is_string_type_p (struct type *type) const override
 703   {
 704     type = check_typedef (type);
 705     return (type->code () == TYPE_CODE_STRING
 706             || (type->code () == TYPE_CODE_ARRAY
 707                 && TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_CHAR));
 708   }
 709
 710 protected:
 711
 712   /* See language.h.  */
 713
 714   symbol_name_matcher_ftype *get_symbol_name_matcher_inner
 715         (const lookup_name_info &lookup_name) const override
 716   {
 717     return cp_get_symbol_name_matcher (lookup_name);
 718   }
 719 };
 720
 721 /* Single instance of the Fortran language class.  */
 722
 723 static f_language f_language_defn;
 724
 725 static void *
 726 build_fortran_types (struct gdbarch *gdbarch)
 727 {
 728   struct builtin_f_type *builtin_f_type
 729     = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_f_type);
 730
 731   builtin_f_type->builtin_void
 732     = arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT, "void");
 733
 734   builtin_f_type->builtin_character
 735     = arch_type (gdbarch, TYPE_CODE_CHAR, TARGET_CHAR_BIT, "character");
 736
 737   builtin_f_type->builtin_logical_s1
 738     = arch_boolean_type (gdbarch, TARGET_CHAR_BIT, 1, "logical*1");
 739
 740   builtin_f_type->builtin_integer_s2
 741     = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), 0,
 742                          "integer*2");
 743
 744   builtin_f_type->builtin_integer_s8
 745     = arch_integer_type (gdbarch, gdbarch_long_long_bit (gdbarch), 0,
 746                          "integer*8");
 747
 748   builtin_f_type->builtin_logical_s2
 749     = arch_boolean_type (gdbarch, gdbarch_short_bit (gdbarch), 1,
 750                          "logical*2");
 751
 752   builtin_f_type->builtin_logical_s8
 753     = arch_boolean_type (gdbarch, gdbarch_long_long_bit (gdbarch), 1,
 754                          "logical*8");
 755
 756   builtin_f_type->builtin_integer
 757     = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0,
 758                          "integer");
 759
 760   builtin_f_type->builtin_logical
 761     = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1,
 762                          "logical*4");
 763
 764   builtin_f_type->builtin_real
 765     = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch),
 766                        "real", gdbarch_float_format (gdbarch));
 767   builtin_f_type->builtin_real_s8
 768     = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch),
 769                        "real*8", gdbarch_double_format (gdbarch));
 770   auto fmt = gdbarch_floatformat_for_type (gdbarch, "real(kind=16)", 128);
 771   if (fmt != nullptr)
 772     builtin_f_type->builtin_real_s16
 773       = arch_float_type (gdbarch, 128, "real*16", fmt);
 774   else if (gdbarch_long_double_bit (gdbarch) == 128)
 775     builtin_f_type->builtin_real_s16
 776       = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
 777                          "real*16", gdbarch_long_double_format (gdbarch));
 778   else
 779     builtin_f_type->builtin_real_s16
 780       = arch_type (gdbarch, TYPE_CODE_ERROR, 128, "real*16");
 781
 782   builtin_f_type->builtin_complex_s8
 783     = init_complex_type ("complex*8", builtin_f_type->builtin_real);
 784   builtin_f_type->builtin_complex_s16
 785     = init_complex_type ("complex*16", builtin_f_type->builtin_real_s8);
 786
 787   if (builtin_f_type->builtin_real_s16->code () == TYPE_CODE_ERROR)
 788     builtin_f_type->builtin_complex_s32
 789       = arch_type (gdbarch, TYPE_CODE_ERROR, 256, "complex*32");
 790   else
 791     builtin_f_type->builtin_complex_s32
 792       = init_complex_type ("complex*32", builtin_f_type->builtin_real_s16);
 793
 794   return builtin_f_type;
 795 }
 796
 797 static struct gdbarch_data *f_type_data;
 798
 799 const struct builtin_f_type *
 800 builtin_f_type (struct gdbarch *gdbarch)
 801 {
 802   return (const struct builtin_f_type *) gdbarch_data (gdbarch, f_type_data);
 803 }
 804
 805 void _initialize_f_language ();
 806 void
 807 _initialize_f_language ()
 808 {
 809   f_type_data = gdbarch_data_register_post_init (build_fortran_types);
 810 }
 811
 812 /* See f-lang.h.  */
 813
 814 struct value *
 815 fortran_argument_convert (struct value *value, bool is_artificial)
 816 {
 817   if (!is_artificial)
 818     {
 819       /* If the value is not in the inferior e.g. registers values,
 820          convenience variables and user input.  */
 821       if (VALUE_LVAL (value) != lval_memory)
 822         {
 823           struct type *type = value_type (value);
 824           const int length = TYPE_LENGTH (type);
 825           const CORE_ADDR addr
 826             = value_as_long (value_allocate_space_in_inferior (length));
 827           write_memory (addr, value_contents (value), length);
 828           struct value *val
 829             = value_from_contents_and_address (type, value_contents (value),
 830                                                addr);
 831           return value_addr (val);
 832         }
 833       else
 834         return value_addr (value); /* Program variables, e.g. arrays.  */
 835     }
 836     return value;
 837 }
 838
 839 /* See f-lang.h.  */
 840
 841 struct type *
 842 fortran_preserve_arg_pointer (struct value *arg, struct type *type)
 843 {
 844   if (value_type (arg)->code () == TYPE_CODE_PTR)
 845     return value_type (arg);
 846   return type;
 847 }