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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [m2-lang.c] - Blame information for rev 297

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1 24 jeremybenn
/* Modula 2 language support routines for GDB, the GNU debugger.
2
 
3
   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2002, 2003, 2004,
4
   2005, 2007, 2008 Free Software Foundation, Inc.
5
 
6
   This file is part of GDB.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
 
21
#include "defs.h"
22
#include "symtab.h"
23
#include "gdbtypes.h"
24
#include "expression.h"
25
#include "parser-defs.h"
26
#include "language.h"
27
#include "m2-lang.h"
28
#include "c-lang.h"
29
#include "valprint.h"
30
 
31
extern void _initialize_m2_language (void);
32
static void m2_printchar (int, struct ui_file *);
33
static void m2_emit_char (int, struct ui_file *, int);
34
 
35
/* Print the character C on STREAM as part of the contents of a literal
36
   string whose delimiter is QUOTER.  Note that that format for printing
37
   characters and strings is language specific.
38
   FIXME:  This is a copy of the same function from c-exp.y.  It should
39
   be replaced with a true Modula version.  */
40
 
41
static void
42
m2_emit_char (int c, struct ui_file *stream, int quoter)
43
{
44
 
45
  c &= 0xFF;                    /* Avoid sign bit follies */
46
 
47
  if (PRINT_LITERAL_FORM (c))
48
    {
49
      if (c == '\\' || c == quoter)
50
        {
51
          fputs_filtered ("\\", stream);
52
        }
53
      fprintf_filtered (stream, "%c", c);
54
    }
55
  else
56
    {
57
      switch (c)
58
        {
59
        case '\n':
60
          fputs_filtered ("\\n", stream);
61
          break;
62
        case '\b':
63
          fputs_filtered ("\\b", stream);
64
          break;
65
        case '\t':
66
          fputs_filtered ("\\t", stream);
67
          break;
68
        case '\f':
69
          fputs_filtered ("\\f", stream);
70
          break;
71
        case '\r':
72
          fputs_filtered ("\\r", stream);
73
          break;
74
        case '\033':
75
          fputs_filtered ("\\e", stream);
76
          break;
77
        case '\007':
78
          fputs_filtered ("\\a", stream);
79
          break;
80
        default:
81
          fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
82
          break;
83
        }
84
    }
85
}
86
 
87
/* FIXME:  This is a copy of the same function from c-exp.y.  It should
88
   be replaced with a true Modula version.  */
89
 
90
static void
91
m2_printchar (int c, struct ui_file *stream)
92
{
93
  fputs_filtered ("'", stream);
94
  LA_EMIT_CHAR (c, stream, '\'');
95
  fputs_filtered ("'", stream);
96
}
97
 
98
/* Print the character string STRING, printing at most LENGTH characters.
99
   Printing stops early if the number hits print_max; repeat counts
100
   are printed as appropriate.  Print ellipses at the end if we
101
   had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
102
   FIXME:  This is a copy of the same function from c-exp.y.  It should
103
   be replaced with a true Modula version.  */
104
 
105
static void
106
m2_printstr (struct ui_file *stream, const gdb_byte *string,
107
             unsigned int length, int width, int force_ellipses)
108
{
109
  unsigned int i;
110
  unsigned int things_printed = 0;
111
  int in_quotes = 0;
112
  int need_comma = 0;
113
 
114
  if (length == 0)
115
    {
116
      fputs_filtered ("\"\"", gdb_stdout);
117
      return;
118
    }
119
 
120
  for (i = 0; i < length && things_printed < print_max; ++i)
121
    {
122
      /* Position of the character we are examining
123
         to see whether it is repeated.  */
124
      unsigned int rep1;
125
      /* Number of repetitions we have detected so far.  */
126
      unsigned int reps;
127
 
128
      QUIT;
129
 
130
      if (need_comma)
131
        {
132
          fputs_filtered (", ", stream);
133
          need_comma = 0;
134
        }
135
 
136
      rep1 = i + 1;
137
      reps = 1;
138
      while (rep1 < length && string[rep1] == string[i])
139
        {
140
          ++rep1;
141
          ++reps;
142
        }
143
 
144
      if (reps > repeat_count_threshold)
145
        {
146
          if (in_quotes)
147
            {
148
              if (inspect_it)
149
                fputs_filtered ("\\\", ", stream);
150
              else
151
                fputs_filtered ("\", ", stream);
152
              in_quotes = 0;
153
            }
154
          m2_printchar (string[i], stream);
155
          fprintf_filtered (stream, " <repeats %u times>", reps);
156
          i = rep1 - 1;
157
          things_printed += repeat_count_threshold;
158
          need_comma = 1;
159
        }
160
      else
161
        {
162
          if (!in_quotes)
163
            {
164
              if (inspect_it)
165
                fputs_filtered ("\\\"", stream);
166
              else
167
                fputs_filtered ("\"", stream);
168
              in_quotes = 1;
169
            }
170
          LA_EMIT_CHAR (string[i], stream, '"');
171
          ++things_printed;
172
        }
173
    }
174
 
175
  /* Terminate the quotes if necessary.  */
176
  if (in_quotes)
177
    {
178
      if (inspect_it)
179
        fputs_filtered ("\\\"", stream);
180
      else
181
        fputs_filtered ("\"", stream);
182
    }
183
 
184
  if (force_ellipses || i < length)
185
    fputs_filtered ("...", stream);
186
}
187
 
188
static struct value *
189
evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
190
                         int *pos, enum noside noside)
191
{
192
  enum exp_opcode op = exp->elts[*pos].opcode;
193
  struct value *arg1;
194
  struct value *arg2;
195
  struct type *type;
196
  switch (op)
197
    {
198
    case UNOP_HIGH:
199
      (*pos)++;
200
      arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
201
 
202
      if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
203
        return arg1;
204
      else
205
        {
206
          arg1 = coerce_ref (arg1);
207
          type = check_typedef (value_type (arg1));
208
 
209
          if (m2_is_unbounded_array (type))
210
            {
211
              struct value *temp = arg1;
212
              type = TYPE_FIELD_TYPE (type, 1);
213
              /* i18n: Do not translate the "_m2_high" part!  */
214
              arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
215
                                       _("unbounded structure "
216
                                         "missing _m2_high field"));
217
 
218
              if (value_type (arg1) != type)
219
                arg1 = value_cast (type, arg1);
220
            }
221
        }
222
      return arg1;
223
 
224
    case BINOP_SUBSCRIPT:
225
      (*pos)++;
226
      arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
227
      arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
228
      if (noside == EVAL_SKIP)
229
        goto nosideret;
230
      /* If the user attempts to subscript something that is not an
231
         array or pointer type (like a plain int variable for example),
232
         then report this as an error.  */
233
 
234
      arg1 = coerce_ref (arg1);
235
      type = check_typedef (value_type (arg1));
236
 
237
      if (m2_is_unbounded_array (type))
238
        {
239
          struct value *temp = arg1;
240
          type = TYPE_FIELD_TYPE (type, 0);
241
          if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR)) {
242
            warning (_("internal error: unbounded array structure is unknown"));
243
            return evaluate_subexp_standard (expect_type, exp, pos, noside);
244
          }
245
          /* i18n: Do not translate the "_m2_contents" part!  */
246
          arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
247
                                   _("unbounded structure "
248
                                     "missing _m2_contents field"));
249
 
250
          if (value_type (arg1) != type)
251
            arg1 = value_cast (type, arg1);
252
 
253
          type = check_typedef (value_type (arg1));
254
          return value_ind (value_add (arg1, arg2));
255
        }
256
      else
257
        if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
258
          {
259
            if (TYPE_NAME (type))
260
              error (_("cannot subscript something of type `%s'"),
261
                     TYPE_NAME (type));
262
            else
263
              error (_("cannot subscript requested type"));
264
          }
265
 
266
      if (noside == EVAL_AVOID_SIDE_EFFECTS)
267
        return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
268
      else
269
        return value_subscript (arg1, arg2);
270
 
271
    default:
272
      return evaluate_subexp_standard (expect_type, exp, pos, noside);
273
    }
274
 
275
 nosideret:
276
  return value_from_longest (builtin_type_long, (LONGEST) 1);
277
}
278
 
279
 
280
/* Table of operators and their precedences for printing expressions.  */
281
 
282
static const struct op_print m2_op_print_tab[] =
283
{
284
  {"+", BINOP_ADD, PREC_ADD, 0},
285
  {"+", UNOP_PLUS, PREC_PREFIX, 0},
286
  {"-", BINOP_SUB, PREC_ADD, 0},
287
  {"-", UNOP_NEG, PREC_PREFIX, 0},
288
  {"*", BINOP_MUL, PREC_MUL, 0},
289
  {"/", BINOP_DIV, PREC_MUL, 0},
290
  {"DIV", BINOP_INTDIV, PREC_MUL, 0},
291
  {"MOD", BINOP_REM, PREC_MUL, 0},
292
  {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
293
  {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
294
  {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
295
  {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
296
  {"=", BINOP_EQUAL, PREC_EQUAL, 0},
297
  {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
298
  {"<=", BINOP_LEQ, PREC_ORDER, 0},
299
  {">=", BINOP_GEQ, PREC_ORDER, 0},
300
  {">", BINOP_GTR, PREC_ORDER, 0},
301
  {"<", BINOP_LESS, PREC_ORDER, 0},
302
  {"^", UNOP_IND, PREC_PREFIX, 0},
303
  {"@", BINOP_REPEAT, PREC_REPEAT, 0},
304
  {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
305
  {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
306
  {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
307
  {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
308
  {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
309
  {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
310
  {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
311
  {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
312
  {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
313
  {NULL, 0, 0, 0}
314
};
315
 
316
/* The built-in types of Modula-2.  */
317
 
318
enum m2_primitive_types {
319
  m2_primitive_type_char,
320
  m2_primitive_type_int,
321
  m2_primitive_type_card,
322
  m2_primitive_type_real,
323
  m2_primitive_type_bool,
324
  nr_m2_primitive_types
325
};
326
 
327
static void
328
m2_language_arch_info (struct gdbarch *gdbarch,
329
                       struct language_arch_info *lai)
330
{
331
  const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
332
 
333
  lai->string_char_type = builtin->builtin_char;
334
  lai->primitive_type_vector
335
    = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
336
                              struct type *);
337
 
338
  lai->primitive_type_vector [m2_primitive_type_char]
339
    = builtin->builtin_char;
340
  lai->primitive_type_vector [m2_primitive_type_int]
341
    = builtin->builtin_int;
342
  lai->primitive_type_vector [m2_primitive_type_card]
343
    = builtin->builtin_card;
344
  lai->primitive_type_vector [m2_primitive_type_real]
345
    = builtin->builtin_real;
346
  lai->primitive_type_vector [m2_primitive_type_bool]
347
    = builtin->builtin_bool;
348
}
349
 
350
const struct exp_descriptor exp_descriptor_modula2 =
351
{
352
  print_subexp_standard,
353
  operator_length_standard,
354
  op_name_standard,
355
  dump_subexp_body_standard,
356
  evaluate_subexp_modula2
357
};
358
 
359
const struct language_defn m2_language_defn =
360
{
361
  "modula-2",
362
  language_m2,
363
  range_check_on,
364
  type_check_on,
365
  case_sensitive_on,
366
  array_row_major,
367
  &exp_descriptor_modula2,
368
  m2_parse,                     /* parser */
369
  m2_error,                     /* parser error function */
370
  null_post_parser,
371
  m2_printchar,                 /* Print character constant */
372
  m2_printstr,                  /* function to print string constant */
373
  m2_emit_char,                 /* Function to print a single character */
374
  m2_print_type,                /* Print a type using appropriate syntax */
375
  m2_val_print,                 /* Print a value using appropriate syntax */
376
  c_value_print,                /* Print a top-level value */
377
  NULL,                         /* Language specific skip_trampoline */
378
  value_of_this,                /* value_of_this */
379
  basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
380
  basic_lookup_transparent_type,/* lookup_transparent_type */
381
  NULL,                         /* Language specific symbol demangler */
382
  NULL,                         /* Language specific class_name_from_physname */
383
  m2_op_print_tab,              /* expression operators for printing */
384
  0,                             /* arrays are first-class (not c-style) */
385
  0,                             /* String lower bound */
386
  default_word_break_characters,
387
  default_make_symbol_completion_list,
388
  m2_language_arch_info,
389
  default_print_array_index,
390
  default_pass_by_reference,
391
  LANG_MAGIC
392
};
393
 
394
static void *
395
build_m2_types (struct gdbarch *gdbarch)
396
{
397
  struct builtin_m2_type *builtin_m2_type
398
    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type);
399
 
400
  /* Modula-2 "pervasive" types.  NOTE:  these can be redefined!!! */
401
  builtin_m2_type->builtin_int =
402
    init_type (TYPE_CODE_INT,
403
               gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT,
404
               0, "INTEGER", (struct objfile *) NULL);
405
  builtin_m2_type->builtin_card =
406
    init_type (TYPE_CODE_INT,
407
               gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT,
408
               TYPE_FLAG_UNSIGNED,
409
               "CARDINAL", (struct objfile *) NULL);
410
  builtin_m2_type->builtin_real =
411
    init_type (TYPE_CODE_FLT,
412
               gdbarch_float_bit (gdbarch) / TARGET_CHAR_BIT,
413
               0,
414
               "REAL", (struct objfile *) NULL);
415
  builtin_m2_type->builtin_char =
416
    init_type (TYPE_CODE_CHAR, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
417
               TYPE_FLAG_UNSIGNED,
418
               "CHAR", (struct objfile *) NULL);
419
  builtin_m2_type->builtin_bool =
420
    init_type (TYPE_CODE_BOOL,
421
               gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT,
422
               TYPE_FLAG_UNSIGNED,
423
               "BOOLEAN", (struct objfile *) NULL);
424
 
425
  return builtin_m2_type;
426
}
427
 
428
static struct gdbarch_data *m2_type_data;
429
 
430
const struct builtin_m2_type *
431
builtin_m2_type (struct gdbarch *gdbarch)
432
{
433
  return gdbarch_data (gdbarch, m2_type_data);
434
}
435
 
436
 
437
/* Initialization for Modula-2 */
438
 
439
void
440
_initialize_m2_language (void)
441
{
442
  m2_type_data = gdbarch_data_register_post_init (build_m2_types);
443
 
444
  add_language (&m2_language_defn);
445
}

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