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