gdb/f-lang.c

   1 /* Fortran language support routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1993-2017 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 "f-lang.h"
  31 #include "valprint.h"
  32 #include "value.h"
  33 #include "cp-support.h"
  34 #include "charset.h"
  35 #include "c-lang.h"
  36
  37
  38 /* Local functions */
  39
  40 extern void _initialize_f_language (void);
  41
  42 static void f_printchar (int c, struct type *type, struct ui_file * stream);
  43 static void f_emit_char (int c, struct type *type,
  44                          struct ui_file * stream, int quoter);
  45
  46 /* Return the encoding that should be used for the character type
  47    TYPE.  */
  48
  49 static const char *
  50 f_get_encoding (struct type *type)
  51 {
  52   const char *encoding;
  53
  54   switch (TYPE_LENGTH (type))
  55     {
  56     case 1:
  57       encoding = target_charset (get_type_arch (type));
  58       break;
  59     case 4:
  60       if (gdbarch_byte_order (get_type_arch (type)) == BFD_ENDIAN_BIG)
  61         encoding = "UTF-32BE";
  62       else
  63         encoding = "UTF-32LE";
  64       break;
  65
  66     default:
  67       error (_("unrecognized character type"));
  68     }
  69
  70   return encoding;
  71 }
  72
  73 /* Print the character C on STREAM as part of the contents of a literal
  74    string whose delimiter is QUOTER.  Note that that format for printing
  75    characters and strings is language specific.
  76    FIXME:  This is a copy of the same function from c-exp.y.  It should
  77    be replaced with a true F77 version.  */
  78
  79 static void
  80 f_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
  81 {
  82   const char *encoding = f_get_encoding (type);
  83
  84   generic_emit_char (c, type, stream, quoter, encoding);
  85 }
  86
  87 /* Implementation of la_printchar.  */
  88
  89 static void
  90 f_printchar (int c, struct type *type, struct ui_file *stream)
  91 {
  92   fputs_filtered ("'", stream);
  93   LA_EMIT_CHAR (c, type, stream, '\'');
  94   fputs_filtered ("'", stream);
  95 }
  96
  97 /* Print the character string STRING, printing at most LENGTH characters.
  98    Printing stops early if the number hits print_max; repeat counts
  99    are printed as appropriate.  Print ellipses at the end if we
 100    had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
 101    FIXME:  This is a copy of the same function from c-exp.y.  It should
 102    be replaced with a true F77 version.  */
 103
 104 static void
 105 f_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
 106             unsigned int length, const char *encoding, int force_ellipses,
 107             const struct value_print_options *options)
 108 {
 109   const char *type_encoding = f_get_encoding (type);
 110
 111   if (TYPE_LENGTH (type) == 4)
 112     fputs_filtered ("4_", stream);
 113
 114   if (!encoding || !*encoding)
 115     encoding = type_encoding;
 116
 117   generic_printstr (stream, type, string, length, encoding,
 118                     force_ellipses, '\'', 0, options);
 119 }
 120 \f
 121
 122 /* Table of operators and their precedences for printing expressions.  */
 123
 124 static const struct op_print f_op_print_tab[] =
 125 {
 126   {"+", BINOP_ADD, PREC_ADD, 0},
 127   {"+", UNOP_PLUS, PREC_PREFIX, 0},
 128   {"-", BINOP_SUB, PREC_ADD, 0},
 129   {"-", UNOP_NEG, PREC_PREFIX, 0},
 130   {"*", BINOP_MUL, PREC_MUL, 0},
 131   {"/", BINOP_DIV, PREC_MUL, 0},
 132   {"DIV", BINOP_INTDIV, PREC_MUL, 0},
 133   {"MOD", BINOP_REM, PREC_MUL, 0},
 134   {"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
 135   {".OR.", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
 136   {".AND.", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
 137   {".NOT.", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
 138   {".EQ.", BINOP_EQUAL, PREC_EQUAL, 0},
 139   {".NE.", BINOP_NOTEQUAL, PREC_EQUAL, 0},
 140   {".LE.", BINOP_LEQ, PREC_ORDER, 0},
 141   {".GE.", BINOP_GEQ, PREC_ORDER, 0},
 142   {".GT.", BINOP_GTR, PREC_ORDER, 0},
 143   {".LT.", BINOP_LESS, PREC_ORDER, 0},
 144   {"**", UNOP_IND, PREC_PREFIX, 0},
 145   {"@", BINOP_REPEAT, PREC_REPEAT, 0},
 146   {NULL, OP_NULL, PREC_REPEAT, 0}
 147 };
 148 \f
 149 enum f_primitive_types {
 150   f_primitive_type_character,
 151   f_primitive_type_logical,
 152   f_primitive_type_logical_s1,
 153   f_primitive_type_logical_s2,
 154   f_primitive_type_logical_s8,
 155   f_primitive_type_integer,
 156   f_primitive_type_integer_s2,
 157   f_primitive_type_real,
 158   f_primitive_type_real_s8,
 159   f_primitive_type_real_s16,
 160   f_primitive_type_complex_s8,
 161   f_primitive_type_complex_s16,
 162   f_primitive_type_void,
 163   nr_f_primitive_types
 164 };
 165
 166 static void
 167 f_language_arch_info (struct gdbarch *gdbarch,
 168                       struct language_arch_info *lai)
 169 {
 170   const struct builtin_f_type *builtin = builtin_f_type (gdbarch);
 171
 172   lai->string_char_type = builtin->builtin_character;
 173   lai->primitive_type_vector
 174     = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_f_primitive_types + 1,
 175                               struct type *);
 176
 177   lai->primitive_type_vector [f_primitive_type_character]
 178     = builtin->builtin_character;
 179   lai->primitive_type_vector [f_primitive_type_logical]
 180     = builtin->builtin_logical;
 181   lai->primitive_type_vector [f_primitive_type_logical_s1]
 182     = builtin->builtin_logical_s1;
 183   lai->primitive_type_vector [f_primitive_type_logical_s2]
 184     = builtin->builtin_logical_s2;
 185   lai->primitive_type_vector [f_primitive_type_logical_s8]
 186     = builtin->builtin_logical_s8;
 187   lai->primitive_type_vector [f_primitive_type_real]
 188     = builtin->builtin_real;
 189   lai->primitive_type_vector [f_primitive_type_real_s8]
 190     = builtin->builtin_real_s8;
 191   lai->primitive_type_vector [f_primitive_type_real_s16]
 192     = builtin->builtin_real_s16;
 193   lai->primitive_type_vector [f_primitive_type_complex_s8]
 194     = builtin->builtin_complex_s8;
 195   lai->primitive_type_vector [f_primitive_type_complex_s16]
 196     = builtin->builtin_complex_s16;
 197   lai->primitive_type_vector [f_primitive_type_void]
 198     = builtin->builtin_void;
 199
 200   lai->bool_type_symbol = "logical";
 201   lai->bool_type_default = builtin->builtin_logical_s2;
 202 }
 203
 204 /* Remove the modules separator :: from the default break list.  */
 205
 206 static const char *
 207 f_word_break_characters (void)
 208 {
 209   static char *retval;
 210
 211   if (!retval)
 212     {
 213       char *s;
 214
 215       retval = xstrdup (default_word_break_characters ());
 216       s = strchr (retval, ':');
 217       if (s)
 218         {
 219           char *last_char = &s[strlen (s) - 1];
 220
 221           *s = *last_char;
 222           *last_char = 0;
 223         }
 224     }
 225   return retval;
 226 }
 227
 228 /* Consider the modules separator :: as a valid symbol name character
 229    class.  */
 230
 231 static void
 232 f_collect_symbol_completion_matches (completion_tracker &tracker,
 233                                      complete_symbol_mode mode,
 234                                      const char *text, const char *word,
 235                                      enum type_code code)
 236 {
 237   default_collect_symbol_completion_matches_break_on (tracker, mode,
 238                                                       text, word, ":", code);
 239 }
 240
 241 static const char *f_extensions[] =
 242 {
 243   ".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
 244   ".f90", ".F90", ".f95", ".F95", ".f03", ".F03", ".f08", ".F08",
 245   NULL
 246 };
 247
 248 extern const struct language_defn f_language_defn =
 249 {
 250   "fortran",
 251   "Fortran",
 252   language_fortran,
 253   range_check_on,
 254   case_sensitive_off,
 255   array_column_major,
 256   macro_expansion_no,
 257   f_extensions,
 258   &exp_descriptor_standard,
 259   f_parse,                      /* parser */
 260   f_yyerror,                    /* parser error function */
 261   null_post_parser,
 262   f_printchar,                  /* Print character constant */
 263   f_printstr,                   /* function to print string constant */
 264   f_emit_char,                  /* Function to print a single character */
 265   f_print_type,                 /* Print a type using appropriate syntax */
 266   default_print_typedef,        /* Print a typedef using appropriate syntax */
 267   f_val_print,                  /* Print a value using appropriate syntax */
 268   c_value_print,                /* FIXME */
 269   default_read_var_value,       /* la_read_var_value */
 270   NULL,                         /* Language specific skip_trampoline */
 271   NULL,                         /* name_of_this */
 272   cp_lookup_symbol_nonlocal,    /* lookup_symbol_nonlocal */
 273   basic_lookup_transparent_type,/* lookup_transparent_type */
 274
 275   /* We could support demangling here to provide module namespaces
 276      also for inferiors with only minimal symbol table (ELF symbols).
 277      Just the mangling standard is not standardized across compilers
 278      and there is no DW_AT_producer available for inferiors with only
 279      the ELF symbols to check the mangling kind.  */
 280   NULL,                         /* Language specific symbol demangler */
 281   NULL,
 282   NULL,                         /* Language specific
 283                                    class_name_from_physname */
 284   f_op_print_tab,               /* expression operators for printing */
 285   0,                            /* arrays are first-class (not c-style) */
 286   1,                            /* String lower bound */
 287   f_word_break_characters,
 288   f_collect_symbol_completion_matches,
 289   f_language_arch_info,
 290   default_print_array_index,
 291   default_pass_by_reference,
 292   default_get_string,
 293   c_watch_location_expression,
 294   NULL,                         /* la_get_symbol_name_cmp */
 295   iterate_over_symbols,
 296   &default_varobj_ops,
 297   NULL,
 298   NULL,
 299   LANG_MAGIC
 300 };
 301
 302 static void *
 303 build_fortran_types (struct gdbarch *gdbarch)
 304 {
 305   struct builtin_f_type *builtin_f_type
 306     = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_f_type);
 307
 308   builtin_f_type->builtin_void
 309     = arch_type (gdbarch, TYPE_CODE_VOID, 1, "VOID");
 310
 311   builtin_f_type->builtin_character
 312     = arch_integer_type (gdbarch, TARGET_CHAR_BIT, 0, "character");
 313
 314   builtin_f_type->builtin_logical_s1
 315     = arch_boolean_type (gdbarch, TARGET_CHAR_BIT, 1, "logical*1");
 316
 317   builtin_f_type->builtin_integer_s2
 318     = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), 0,
 319                          "integer*2");
 320
 321   builtin_f_type->builtin_logical_s2
 322     = arch_boolean_type (gdbarch, gdbarch_short_bit (gdbarch), 1,
 323                          "logical*2");
 324
 325   builtin_f_type->builtin_logical_s8
 326     = arch_boolean_type (gdbarch, gdbarch_long_long_bit (gdbarch), 1,
 327                          "logical*8");
 328
 329   builtin_f_type->builtin_integer
 330     = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0,
 331                          "integer");
 332
 333   builtin_f_type->builtin_logical
 334     = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1,
 335                          "logical*4");
 336
 337   builtin_f_type->builtin_real
 338     = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch),
 339                        "real", gdbarch_float_format (gdbarch));
 340   builtin_f_type->builtin_real_s8
 341     = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch),
 342                        "real*8", gdbarch_double_format (gdbarch));
 343   builtin_f_type->builtin_real_s16
 344     = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
 345                        "real*16", gdbarch_long_double_format (gdbarch));
 346
 347   builtin_f_type->builtin_complex_s8
 348     = arch_complex_type (gdbarch, "complex*8",
 349                          builtin_f_type->builtin_real);
 350   builtin_f_type->builtin_complex_s16
 351     = arch_complex_type (gdbarch, "complex*16",
 352                          builtin_f_type->builtin_real_s8);
 353   builtin_f_type->builtin_complex_s32
 354     = arch_complex_type (gdbarch, "complex*32",
 355                          builtin_f_type->builtin_real_s16);
 356
 357   return builtin_f_type;
 358 }
 359
 360 static struct gdbarch_data *f_type_data;
 361
 362 const struct builtin_f_type *
 363 builtin_f_type (struct gdbarch *gdbarch)
 364 {
 365   return (const struct builtin_f_type *) gdbarch_data (gdbarch, f_type_data);
 366 }
 367
 368 void
 369 _initialize_f_language (void)
 370 {
 371   f_type_data = gdbarch_data_register_post_init (build_fortran_types);
 372 }