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 (nullptr, 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 (nullptr, 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 (nullptr, 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 (nullptr, 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 (nullptr, 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 (nullptr, 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 /* Expression processing for Fortran.  */
 475 static const struct exp_descriptor exp_descriptor_f =
 476 {
 477   print_subexp_f,
 478   operator_length_f,
 479   operator_check_f,
 480   op_name_f,
 481   dump_subexp_body_f,
 482   evaluate_subexp_f
 483 };
 484
 485 /* Class representing the Fortran language.  */
 486
 487 class f_language : public language_defn
 488 {
 489 public:
 490   f_language ()
 491     : language_defn (language_fortran)
 492   { /* Nothing.  */ }
 493
 494   /* See language.h.  */
 495
 496   const char *name () const override
 497   { return "fortran"; }
 498
 499   /* See language.h.  */
 500
 501   const char *natural_name () const override
 502   { return "Fortran"; }
 503
 504   /* See language.h.  */
 505
 506   const std::vector<const char *> &filename_extensions () const override
 507   {
 508     static const std::vector<const char *> extensions = {
 509       ".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
 510       ".f90", ".F90", ".f95", ".F95", ".f03", ".F03", ".f08", ".F08"
 511     };
 512     return extensions;
 513   }
 514
 515   /* See language.h.  */
 516   void language_arch_info (struct gdbarch *gdbarch,
 517                            struct language_arch_info *lai) const override
 518   {
 519     const struct builtin_f_type *builtin = builtin_f_type (gdbarch);
 520
 521     lai->string_char_type = builtin->builtin_character;
 522     lai->primitive_type_vector
 523       = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_f_primitive_types + 1,
 524                                 struct type *);
 525
 526     lai->primitive_type_vector [f_primitive_type_character]
 527       = builtin->builtin_character;
 528     lai->primitive_type_vector [f_primitive_type_logical]
 529       = builtin->builtin_logical;
 530     lai->primitive_type_vector [f_primitive_type_logical_s1]
 531       = builtin->builtin_logical_s1;
 532     lai->primitive_type_vector [f_primitive_type_logical_s2]
 533       = builtin->builtin_logical_s2;
 534     lai->primitive_type_vector [f_primitive_type_logical_s8]
 535       = builtin->builtin_logical_s8;
 536     lai->primitive_type_vector [f_primitive_type_real]
 537       = builtin->builtin_real;
 538     lai->primitive_type_vector [f_primitive_type_real_s8]
 539       = builtin->builtin_real_s8;
 540     lai->primitive_type_vector [f_primitive_type_real_s16]
 541       = builtin->builtin_real_s16;
 542     lai->primitive_type_vector [f_primitive_type_complex_s8]
 543       = builtin->builtin_complex_s8;
 544     lai->primitive_type_vector [f_primitive_type_complex_s16]
 545       = builtin->builtin_complex_s16;
 546     lai->primitive_type_vector [f_primitive_type_void]
 547       = builtin->builtin_void;
 548
 549     lai->bool_type_symbol = "logical";
 550     lai->bool_type_default = builtin->builtin_logical_s2;
 551   }
 552
 553   /* See language.h.  */
 554   unsigned int search_name_hash (const char *name) const override
 555   {
 556     return cp_search_name_hash (name);
 557   }
 558
 559   /* See language.h.  */
 560
 561   char *demangle (const char *mangled, int options) const override
 562   {
 563       /* We could support demangling here to provide module namespaces
 564          also for inferiors with only minimal symbol table (ELF symbols).
 565          Just the mangling standard is not standardized across compilers
 566          and there is no DW_AT_producer available for inferiors with only
 567          the ELF symbols to check the mangling kind.  */
 568     return nullptr;
 569   }
 570
 571   /* See language.h.  */
 572
 573   void print_type (struct type *type, const char *varstring,
 574                    struct ui_file *stream, int show, int level,
 575                    const struct type_print_options *flags) const override
 576   {
 577     f_print_type (type, varstring, stream, show, level, flags);
 578   }
 579
 580   /* See language.h.  This just returns default set of word break
 581      characters but with the modules separator `::' removed.  */
 582
 583   const char *word_break_characters (void) const override
 584   {
 585     static char *retval;
 586
 587     if (!retval)
 588       {
 589         char *s;
 590
 591         retval = xstrdup (language_defn::word_break_characters ());
 592         s = strchr (retval, ':');
 593         if (s)
 594           {
 595             char *last_char = &s[strlen (s) - 1];
 596
 597             *s = *last_char;
 598             *last_char = 0;
 599           }
 600       }
 601     return retval;
 602   }
 603
 604
 605   /* See language.h.  */
 606
 607   void collect_symbol_completion_matches (completion_tracker &tracker,
 608                                           complete_symbol_mode mode,
 609                                           symbol_name_match_type name_match_type,
 610                                           const char *text, const char *word,
 611                                           enum type_code code) const override
 612   {
 613     /* Consider the modules separator :: as a valid symbol name character
 614        class.  */
 615     default_collect_symbol_completion_matches_break_on (tracker, mode,
 616                                                         name_match_type,
 617                                                         text, word, ":",
 618                                                         code);
 619   }
 620
 621   /* See language.h.  */
 622
 623   void value_print_inner
 624         (struct value *val, struct ui_file *stream, int recurse,
 625          const struct value_print_options *options) const override
 626   {
 627     return f_value_print_inner (val, stream, recurse, options);
 628   }
 629
 630   /* See language.h.  */
 631
 632   struct block_symbol lookup_symbol_nonlocal
 633         (const char *name, const struct block *block,
 634          const domain_enum domain) const override
 635   {
 636     return cp_lookup_symbol_nonlocal (this, name, block, domain);
 637   }
 638
 639   /* See language.h.  */
 640
 641   int parser (struct parser_state *ps) const override
 642   {
 643     return f_parse (ps);
 644   }
 645
 646   /* See language.h.  */
 647
 648   void emitchar (int ch, struct type *chtype,
 649                  struct ui_file *stream, int quoter) const override
 650   {
 651     const char *encoding = f_get_encoding (chtype);
 652     generic_emit_char (ch, chtype, stream, quoter, encoding);
 653   }
 654
 655   /* See language.h.  */
 656
 657   void printchar (int ch, struct type *chtype,
 658                   struct ui_file *stream) const override
 659   {
 660     fputs_filtered ("'", stream);
 661     LA_EMIT_CHAR (ch, chtype, stream, '\'');
 662     fputs_filtered ("'", stream);
 663   }
 664
 665   /* See language.h.  */
 666
 667   void printstr (struct ui_file *stream, struct type *elttype,
 668                  const gdb_byte *string, unsigned int length,
 669                  const char *encoding, int force_ellipses,
 670                  const struct value_print_options *options) const override
 671   {
 672     const char *type_encoding = f_get_encoding (elttype);
 673
 674     if (TYPE_LENGTH (elttype) == 4)
 675       fputs_filtered ("4_", stream);
 676
 677     if (!encoding || !*encoding)
 678       encoding = type_encoding;
 679
 680     generic_printstr (stream, elttype, string, length, encoding,
 681                       force_ellipses, '\'', 0, options);
 682   }
 683
 684   /* See language.h.  */
 685
 686   void print_typedef (struct type *type, struct symbol *new_symbol,
 687                       struct ui_file *stream) const override
 688   {
 689     f_print_typedef (type, new_symbol, stream);
 690   }
 691
 692   /* See language.h.  */
 693
 694   bool is_string_type_p (struct type *type) const override
 695   {
 696     type = check_typedef (type);
 697     return (type->code () == TYPE_CODE_STRING
 698             || (type->code () == TYPE_CODE_ARRAY
 699                 && TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_CHAR));
 700   }
 701
 702   /* See language.h.  */
 703
 704   const char *struct_too_deep_ellipsis () const override
 705   { return "(...)"; }
 706
 707   /* See language.h.  */
 708
 709   bool c_style_arrays_p () const override
 710   { return false; }
 711
 712   /* See language.h.  */
 713
 714   bool range_checking_on_by_default () const override
 715   { return true; }
 716
 717   /* See language.h.  */
 718
 719   enum case_sensitivity case_sensitivity () const override
 720   { return case_sensitive_off; }
 721
 722   /* See language.h.  */
 723
 724   enum array_ordering array_ordering () const override
 725   { return array_column_major; }
 726
 727   /* See language.h.  */
 728
 729   const struct exp_descriptor *expression_ops () const override
 730   { return &exp_descriptor_f; }
 731
 732   /* See language.h.  */
 733
 734   const struct op_print *opcode_print_table () const override
 735   { return f_op_print_tab; }
 736
 737 protected:
 738
 739   /* See language.h.  */
 740
 741   symbol_name_matcher_ftype *get_symbol_name_matcher_inner
 742         (const lookup_name_info &lookup_name) const override
 743   {
 744     return cp_get_symbol_name_matcher (lookup_name);
 745   }
 746 };
 747
 748 /* Single instance of the Fortran language class.  */
 749
 750 static f_language f_language_defn;
 751
 752 static void *
 753 build_fortran_types (struct gdbarch *gdbarch)
 754 {
 755   struct builtin_f_type *builtin_f_type
 756     = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_f_type);
 757
 758   builtin_f_type->builtin_void
 759     = arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT, "void");
 760
 761   builtin_f_type->builtin_character
 762     = arch_type (gdbarch, TYPE_CODE_CHAR, TARGET_CHAR_BIT, "character");
 763
 764   builtin_f_type->builtin_logical_s1
 765     = arch_boolean_type (gdbarch, TARGET_CHAR_BIT, 1, "logical*1");
 766
 767   builtin_f_type->builtin_integer_s2
 768     = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), 0,
 769                          "integer*2");
 770
 771   builtin_f_type->builtin_integer_s8
 772     = arch_integer_type (gdbarch, gdbarch_long_long_bit (gdbarch), 0,
 773                          "integer*8");
 774
 775   builtin_f_type->builtin_logical_s2
 776     = arch_boolean_type (gdbarch, gdbarch_short_bit (gdbarch), 1,
 777                          "logical*2");
 778
 779   builtin_f_type->builtin_logical_s8
 780     = arch_boolean_type (gdbarch, gdbarch_long_long_bit (gdbarch), 1,
 781                          "logical*8");
 782
 783   builtin_f_type->builtin_integer
 784     = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0,
 785                          "integer");
 786
 787   builtin_f_type->builtin_logical
 788     = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1,
 789                          "logical*4");
 790
 791   builtin_f_type->builtin_real
 792     = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch),
 793                        "real", gdbarch_float_format (gdbarch));
 794   builtin_f_type->builtin_real_s8
 795     = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch),
 796                        "real*8", gdbarch_double_format (gdbarch));
 797   auto fmt = gdbarch_floatformat_for_type (gdbarch, "real(kind=16)", 128);
 798   if (fmt != nullptr)
 799     builtin_f_type->builtin_real_s16
 800       = arch_float_type (gdbarch, 128, "real*16", fmt);
 801   else if (gdbarch_long_double_bit (gdbarch) == 128)
 802     builtin_f_type->builtin_real_s16
 803       = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
 804                          "real*16", gdbarch_long_double_format (gdbarch));
 805   else
 806     builtin_f_type->builtin_real_s16
 807       = arch_type (gdbarch, TYPE_CODE_ERROR, 128, "real*16");
 808
 809   builtin_f_type->builtin_complex_s8
 810     = init_complex_type ("complex*8", builtin_f_type->builtin_real);
 811   builtin_f_type->builtin_complex_s16
 812     = init_complex_type ("complex*16", builtin_f_type->builtin_real_s8);
 813
 814   if (builtin_f_type->builtin_real_s16->code () == TYPE_CODE_ERROR)
 815     builtin_f_type->builtin_complex_s32
 816       = arch_type (gdbarch, TYPE_CODE_ERROR, 256, "complex*32");
 817   else
 818     builtin_f_type->builtin_complex_s32
 819       = init_complex_type ("complex*32", builtin_f_type->builtin_real_s16);
 820
 821   return builtin_f_type;
 822 }
 823
 824 static struct gdbarch_data *f_type_data;
 825
 826 const struct builtin_f_type *
 827 builtin_f_type (struct gdbarch *gdbarch)
 828 {
 829   return (const struct builtin_f_type *) gdbarch_data (gdbarch, f_type_data);
 830 }
 831
 832 void _initialize_f_language ();
 833 void
 834 _initialize_f_language ()
 835 {
 836   f_type_data = gdbarch_data_register_post_init (build_fortran_types);
 837 }
 838
 839 /* See f-lang.h.  */
 840
 841 struct value *
 842 fortran_argument_convert (struct value *value, bool is_artificial)
 843 {
 844   if (!is_artificial)
 845     {
 846       /* If the value is not in the inferior e.g. registers values,
 847          convenience variables and user input.  */
 848       if (VALUE_LVAL (value) != lval_memory)
 849         {
 850           struct type *type = value_type (value);
 851           const int length = TYPE_LENGTH (type);
 852           const CORE_ADDR addr
 853             = value_as_long (value_allocate_space_in_inferior (length));
 854           write_memory (addr, value_contents (value), length);
 855           struct value *val
 856             = value_from_contents_and_address (type, value_contents (value),
 857                                                addr);
 858           return value_addr (val);
 859         }
 860       else
 861         return value_addr (value); /* Program variables, e.g. arrays.  */
 862     }
 863     return value;
 864 }
 865
 866 /* See f-lang.h.  */
 867
 868 struct type *
 869 fortran_preserve_arg_pointer (struct value *arg, struct type *type)
 870 {
 871   if (value_type (arg)->code () == TYPE_CODE_PTR)
 872     return value_type (arg);
 873   return type;
 874 }