gdb/p-lang.c

   1 /* Pascal language support routines for GDB, the GNU debugger.
   2    Copyright 2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* This file is derived from c-lang.c */
  21
  22 #include "defs.h"
  23 #include "symtab.h"
  24 #include "gdbtypes.h"
  25 #include "expression.h"
  26 #include "parser-defs.h"
  27 #include "language.h"
  28 #include "p-lang.h"
  29 #include "valprint.h"
  30 #include <ctype.h>
  31
  32 extern void _initialize_pascal_language (void);
  33
  34
  35 /* Determines if type TYPE is a pascal string type.
  36    Returns 1 if the type is a known pascal type
  37    This function is used by p-valprint.c code to allow better string display.
  38    If it is a pascal string type, then it also sets info needed
  39    to get the length and the data of the string
  40    length_pos, length_size and string_pos are given in bytes.
  41    char_size gives the element size in bytes.
  42    FIXME: if the position or the size of these fields
  43    are not multiple of TARGET_CHAR_BIT then the results are wrong
  44    but this does not happen for Free Pascal nor for GPC.  */
  45 int
  46 is_pascal_string_type (struct type *type,int *length_pos,
  47                        int * length_size, int *string_pos, int *char_size)
  48 {
  49   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
  50     {
  51       /* Old Borland type pascal strings from Free Pascal Compiler.  */
  52       /* Two fields: length and st.  */
  53       if (TYPE_NFIELDS (type) == 2
  54           && strcmp (TYPE_FIELDS (type)[0].name, "length") == 0
  55           && strcmp (TYPE_FIELDS (type)[1].name, "st") == 0)
  56         {
  57           *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
  58           *length_size = TYPE_FIELD_TYPE (type, 0)->length;
  59           *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
  60           *char_size = 1;
  61           return 1;
  62         };
  63       /* GNU pascal strings.  */
  64       /* Three fields: Capacity, length and schema$ or _p_schema.  */
  65       if (TYPE_NFIELDS (type) == 3
  66           && strcmp (TYPE_FIELDS (type)[0].name, "Capacity") == 0
  67           && strcmp (TYPE_FIELDS (type)[1].name, "length") == 0)
  68         {
  69           *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
  70           *length_size = TYPE_FIELD_TYPE (type, 1)->length;
  71           *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
  72           /* FIXME: how can I detect wide chars in GPC ?? */
  73           *char_size = 1;
  74           return 1;
  75         };
  76     }
  77   return 0;
  78 }
  79
  80 static void pascal_one_char (int, struct ui_file *, int *);
  81
  82 /* Print the character C on STREAM as part of the contents of a literal
  83    string.
  84    In_quotes is reset to 0 if a char is written with #4 notation */
  85
  86 static void
  87 pascal_one_char (register int c, struct ui_file *stream, int *in_quotes)
  88 {
  89
  90   c &= 0xFF;                    /* Avoid sign bit follies */
  91
  92   if ((c == '\'') || (PRINT_LITERAL_FORM (c)))
  93     {
  94       if (!(*in_quotes))
  95         fputs_filtered ("'", stream);
  96       *in_quotes = 1;
  97       if (c == '\'')
  98         {
  99           fputs_filtered ("''", stream);
 100         }
 101       else
 102         fprintf_filtered (stream, "%c", c);
 103     }
 104   else
 105     {
 106       if (*in_quotes)
 107         fputs_filtered ("'", stream);
 108       *in_quotes = 0;
 109       fprintf_filtered (stream, "#%d", (unsigned int) c);
 110     }
 111 }
 112
 113 static void pascal_emit_char (int c, struct ui_file *stream, int quoter);
 114
 115 /* Print the character C on STREAM as part of the contents of a literal
 116    string whose delimiter is QUOTER.  Note that that format for printing
 117    characters and strings is language specific. */
 118
 119 static void
 120 pascal_emit_char (register int c, struct ui_file *stream, int quoter)
 121 {
 122   int in_quotes = 0;
 123   pascal_one_char (c, stream, &in_quotes);
 124   if (in_quotes)
 125     fputs_filtered ("'", stream);
 126 }
 127
 128 void
 129 pascal_printchar (int c, struct ui_file *stream)
 130 {
 131   int in_quotes = 0;
 132   pascal_one_char (c, stream, &in_quotes);
 133   if (in_quotes)
 134     fputs_filtered ("'", stream);
 135 }
 136
 137 /* Print the character string STRING, printing at most LENGTH characters.
 138    Printing stops early if the number hits print_max; repeat counts
 139    are printed as appropriate.  Print ellipses at the end if we
 140    had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.  */
 141
 142 void
 143 pascal_printstr (struct ui_file *stream, char *string, unsigned int length,
 144                  int width, int force_ellipses)
 145 {
 146   register unsigned int i;
 147   unsigned int things_printed = 0;
 148   int in_quotes = 0;
 149   int need_comma = 0;
 150   extern int inspect_it;
 151
 152   /* If the string was not truncated due to `set print elements', and
 153      the last byte of it is a null, we don't print that, in traditional C
 154      style.  */
 155   if ((!force_ellipses) && length > 0 && string[length - 1] == '\0')
 156     length--;
 157
 158   if (length == 0)
 159     {
 160       fputs_filtered ("''", stream);
 161       return;
 162     }
 163
 164   for (i = 0; i < length && things_printed < print_max; ++i)
 165     {
 166       /* Position of the character we are examining
 167          to see whether it is repeated.  */
 168       unsigned int rep1;
 169       /* Number of repetitions we have detected so far.  */
 170       unsigned int reps;
 171
 172       QUIT;
 173
 174       if (need_comma)
 175         {
 176           fputs_filtered (", ", stream);
 177           need_comma = 0;
 178         }
 179
 180       rep1 = i + 1;
 181       reps = 1;
 182       while (rep1 < length && string[rep1] == string[i])
 183         {
 184           ++rep1;
 185           ++reps;
 186         }
 187
 188       if (reps > repeat_count_threshold)
 189         {
 190           if (in_quotes)
 191             {
 192               if (inspect_it)
 193                 fputs_filtered ("\\', ", stream);
 194               else
 195                 fputs_filtered ("', ", stream);
 196               in_quotes = 0;
 197             }
 198           pascal_printchar (string[i], stream);
 199           fprintf_filtered (stream, " <repeats %u times>", reps);
 200           i = rep1 - 1;
 201           things_printed += repeat_count_threshold;
 202           need_comma = 1;
 203         }
 204       else
 205         {
 206           int c = string[i];
 207           if ((!in_quotes) && (PRINT_LITERAL_FORM (c)))
 208             {
 209               if (inspect_it)
 210                 fputs_filtered ("\\'", stream);
 211               else
 212                 fputs_filtered ("'", stream);
 213               in_quotes = 1;
 214             }
 215           pascal_one_char (c, stream, &in_quotes);
 216           ++things_printed;
 217         }
 218     }
 219
 220   /* Terminate the quotes if necessary.  */
 221   if (in_quotes)
 222     {
 223       if (inspect_it)
 224         fputs_filtered ("\\'", stream);
 225       else
 226         fputs_filtered ("'", stream);
 227     }
 228
 229   if (force_ellipses || i < length)
 230     fputs_filtered ("...", stream);
 231 }
 232
 233 /* Create a fundamental Pascal type using default reasonable for the current
 234    target machine.
 235
 236    Some object/debugging file formats (DWARF version 1, COFF, etc) do not
 237    define fundamental types such as "int" or "double".  Others (stabs or
 238    DWARF version 2, etc) do define fundamental types.  For the formats which
 239    don't provide fundamental types, gdb can create such types using this
 240    function.
 241
 242    FIXME:  Some compilers distinguish explicitly signed integral types
 243    (signed short, signed int, signed long) from "regular" integral types
 244    (short, int, long) in the debugging information.  There is some dis-
 245    agreement as to how useful this feature is.  In particular, gcc does
 246    not support this.  Also, only some debugging formats allow the
 247    distinction to be passed on to a debugger.  For now, we always just
 248    use "short", "int", or "long" as the type name, for both the implicit
 249    and explicitly signed types.  This also makes life easier for the
 250    gdb test suite since we don't have to account for the differences
 251    in output depending upon what the compiler and debugging format
 252    support.  We will probably have to re-examine the issue when gdb
 253    starts taking it's fundamental type information directly from the
 254    debugging information supplied by the compiler.  fnf@cygnus.com */
 255
 256 /* Note there might be some discussion about the choosen correspondance
 257    because it mainly reflects Free Pascal Compiler setup for now PM */
 258
 259
 260 struct type *
 261 pascal_create_fundamental_type (struct objfile *objfile, int typeid)
 262 {
 263   register struct type *type = NULL;
 264
 265   switch (typeid)
 266     {
 267     default:
 268       /* FIXME:  For now, if we are asked to produce a type not in this
 269          language, create the equivalent of a C integer type with the
 270          name "<?type?>".  When all the dust settles from the type
 271          reconstruction work, this should probably become an error. */
 272       type = init_type (TYPE_CODE_INT,
 273                         TARGET_INT_BIT / TARGET_CHAR_BIT,
 274                         0, "<?type?>", objfile);
 275       warning ("internal error: no Pascal fundamental type %d", typeid);
 276       break;
 277     case FT_VOID:
 278       type = init_type (TYPE_CODE_VOID,
 279                         TARGET_CHAR_BIT / TARGET_CHAR_BIT,
 280                         0, "void", objfile);
 281       break;
 282     case FT_CHAR:
 283       type = init_type (TYPE_CODE_INT,
 284                         TARGET_CHAR_BIT / TARGET_CHAR_BIT,
 285                         0, "char", objfile);
 286       break;
 287     case FT_SIGNED_CHAR:
 288       type = init_type (TYPE_CODE_INT,
 289                         TARGET_CHAR_BIT / TARGET_CHAR_BIT,
 290                         0, "shortint", objfile);
 291       break;
 292     case FT_UNSIGNED_CHAR:
 293       type = init_type (TYPE_CODE_INT,
 294                         TARGET_CHAR_BIT / TARGET_CHAR_BIT,
 295                         TYPE_FLAG_UNSIGNED, "byte", objfile);
 296       break;
 297     case FT_SHORT:
 298       type = init_type (TYPE_CODE_INT,
 299                         TARGET_SHORT_BIT / TARGET_CHAR_BIT,
 300                         0, "integer", objfile);
 301       break;
 302     case FT_SIGNED_SHORT:
 303       type = init_type (TYPE_CODE_INT,
 304                         TARGET_SHORT_BIT / TARGET_CHAR_BIT,
 305                         0, "integer", objfile);         /* FIXME-fnf */
 306       break;
 307     case FT_UNSIGNED_SHORT:
 308       type = init_type (TYPE_CODE_INT,
 309                         TARGET_SHORT_BIT / TARGET_CHAR_BIT,
 310                         TYPE_FLAG_UNSIGNED, "word", objfile);
 311       break;
 312     case FT_INTEGER:
 313       type = init_type (TYPE_CODE_INT,
 314                         TARGET_INT_BIT / TARGET_CHAR_BIT,
 315                         0, "longint", objfile);
 316       break;
 317     case FT_SIGNED_INTEGER:
 318       type = init_type (TYPE_CODE_INT,
 319                         TARGET_INT_BIT / TARGET_CHAR_BIT,
 320                         0, "longint", objfile);         /* FIXME -fnf */
 321       break;
 322     case FT_UNSIGNED_INTEGER:
 323       type = init_type (TYPE_CODE_INT,
 324                         TARGET_INT_BIT / TARGET_CHAR_BIT,
 325                         TYPE_FLAG_UNSIGNED, "cardinal", objfile);
 326       break;
 327     case FT_LONG:
 328       type = init_type (TYPE_CODE_INT,
 329                         TARGET_LONG_BIT / TARGET_CHAR_BIT,
 330                         0, "long", objfile);
 331       break;
 332     case FT_SIGNED_LONG:
 333       type = init_type (TYPE_CODE_INT,
 334                         TARGET_LONG_BIT / TARGET_CHAR_BIT,
 335                         0, "long", objfile);    /* FIXME -fnf */
 336       break;
 337     case FT_UNSIGNED_LONG:
 338       type = init_type (TYPE_CODE_INT,
 339                         TARGET_LONG_BIT / TARGET_CHAR_BIT,
 340                         TYPE_FLAG_UNSIGNED, "unsigned long", objfile);
 341       break;
 342     case FT_LONG_LONG:
 343       type = init_type (TYPE_CODE_INT,
 344                         TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
 345                         0, "long long", objfile);
 346       break;
 347     case FT_SIGNED_LONG_LONG:
 348       type = init_type (TYPE_CODE_INT,
 349                         TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
 350                         0, "signed long long", objfile);
 351       break;
 352     case FT_UNSIGNED_LONG_LONG:
 353       type = init_type (TYPE_CODE_INT,
 354                         TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
 355                         TYPE_FLAG_UNSIGNED, "unsigned long long", objfile);
 356       break;
 357     case FT_FLOAT:
 358       type = init_type (TYPE_CODE_FLT,
 359                         TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
 360                         0, "float", objfile);
 361       break;
 362     case FT_DBL_PREC_FLOAT:
 363       type = init_type (TYPE_CODE_FLT,
 364                         TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
 365                         0, "double", objfile);
 366       break;
 367     case FT_EXT_PREC_FLOAT:
 368       type = init_type (TYPE_CODE_FLT,
 369                         TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
 370                         0, "extended", objfile);
 371       break;
 372     }
 373   return (type);
 374 }
 375 \f
 376
 377 /* Table mapping opcodes into strings for printing operators
 378    and precedences of the operators.  */
 379
 380 const struct op_print pascal_op_print_tab[] =
 381 {
 382   {",", BINOP_COMMA, PREC_COMMA, 0},
 383   {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
 384   {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
 385   {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
 386   {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
 387   {"=", BINOP_EQUAL, PREC_EQUAL, 0},
 388   {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
 389   {"<=", BINOP_LEQ, PREC_ORDER, 0},
 390   {">=", BINOP_GEQ, PREC_ORDER, 0},
 391   {">", BINOP_GTR, PREC_ORDER, 0},
 392   {"<", BINOP_LESS, PREC_ORDER, 0},
 393   {"shr", BINOP_RSH, PREC_SHIFT, 0},
 394   {"shl", BINOP_LSH, PREC_SHIFT, 0},
 395   {"+", BINOP_ADD, PREC_ADD, 0},
 396   {"-", BINOP_SUB, PREC_ADD, 0},
 397   {"*", BINOP_MUL, PREC_MUL, 0},
 398   {"/", BINOP_DIV, PREC_MUL, 0},
 399   {"div", BINOP_INTDIV, PREC_MUL, 0},
 400   {"mod", BINOP_REM, PREC_MUL, 0},
 401   {"@", BINOP_REPEAT, PREC_REPEAT, 0},
 402   {"-", UNOP_NEG, PREC_PREFIX, 0},
 403   {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
 404   {"^", UNOP_IND, PREC_SUFFIX, 1},
 405   {"@", UNOP_ADDR, PREC_PREFIX, 0},
 406   {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
 407   {NULL, 0, 0, 0}
 408 };
 409 \f
 410 struct type **const /* CONST_PTR v 4.17 */ (pascal_builtin_types[]) =
 411 {
 412   &builtin_type_int,
 413     &builtin_type_long,
 414     &builtin_type_short,
 415     &builtin_type_char,
 416     &builtin_type_float,
 417     &builtin_type_double,
 418     &builtin_type_void,
 419     &builtin_type_long_long,
 420     &builtin_type_signed_char,
 421     &builtin_type_unsigned_char,
 422     &builtin_type_unsigned_short,
 423     &builtin_type_unsigned_int,
 424     &builtin_type_unsigned_long,
 425     &builtin_type_unsigned_long_long,
 426     &builtin_type_long_double,
 427     &builtin_type_complex,
 428     &builtin_type_double_complex,
 429     0
 430 };
 431
 432 const struct language_defn pascal_language_defn =
 433 {
 434   "pascal",                     /* Language name */
 435   language_pascal,
 436   pascal_builtin_types,
 437   range_check_on,
 438   type_check_on,
 439   case_sensitive_on,
 440   pascal_parse,
 441   pascal_error,
 442   evaluate_subexp_standard,
 443   pascal_printchar,             /* Print a character constant */
 444   pascal_printstr,              /* Function to print string constant */
 445   pascal_emit_char,             /* Print a single char */
 446   pascal_create_fundamental_type,       /* Create fundamental type in this language */
 447   pascal_print_type,            /* Print a type using appropriate syntax */
 448   pascal_val_print,             /* Print a value using appropriate syntax */
 449   pascal_value_print,           /* Print a top-level value */
 450   {"", "%", "b", ""},           /* Binary format info */
 451   {"0%lo", "0", "o", ""},       /* Octal format info */
 452   {"%ld", "", "d", ""},         /* Decimal format info */
 453   {"$%lx", "$", "x", ""},       /* Hex format info */
 454   pascal_op_print_tab,          /* expression operators for printing */
 455   1,                            /* c-style arrays */
 456   0,                            /* String lower bound */
 457   &builtin_type_char,           /* Type of string elements */
 458   LANG_MAGIC
 459 };
 460
 461 void
 462 _initialize_pascal_language (void)
 463 {
 464   add_language (&pascal_language_defn);
 465 }