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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [p-lang.c] - Blame information for rev 258

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1 24 jeremybenn
/* Pascal language support routines for GDB, the GNU debugger.
2
 
3
   Copyright (C) 2000, 2002, 2003, 2004, 2005, 2007, 2008
4
   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
/* This file is derived from c-lang.c */
22
 
23
#include "defs.h"
24
#include "gdb_string.h"
25
#include "symtab.h"
26
#include "gdbtypes.h"
27
#include "expression.h"
28
#include "parser-defs.h"
29
#include "language.h"
30
#include "p-lang.h"
31
#include "valprint.h"
32
#include "value.h"
33
#include <ctype.h>
34
 
35
extern void _initialize_pascal_language (void);
36
 
37
 
38
/* All GPC versions until now (2007-09-27) also define a symbol called
39
   '_p_initialize'. Check for the presence of this symbol first.  */
40
static const char GPC_P_INITIALIZE[] = "_p_initialize";
41
 
42
/* The name of the symbol that GPC uses as the name of the main
43
   procedure (since version 20050212).  */
44
static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
45
 
46
/* Older versions of GPC (versions older than 20050212) were using
47
   a different name for the main procedure.  */
48
static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
49
 
50
/* Function returning the special symbol name used
51
   by GPC for the main procedure in the main program
52
   if it is found in minimal symbol list.
53
   This function tries to find minimal symbols generated by GPC
54
   so that it finds the even if the program was compiled
55
   without debugging information.
56
   According to information supplied by Waldeck Hebisch,
57
   this should work for all versions posterior to June 2000. */
58
 
59
const char *
60
pascal_main_name (void)
61
{
62
  struct minimal_symbol *msym;
63
 
64
  msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
65
 
66
  /*  If '_p_initialize' was not found, the main program is likely not
67
     written in Pascal.  */
68
  if (msym == NULL)
69
    return NULL;
70
 
71
  msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
72
  if (msym != NULL)
73
    {
74
      return GPC_MAIN_PROGRAM_NAME_1;
75
    }
76
 
77
  msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
78
  if (msym != NULL)
79
    {
80
      return GPC_MAIN_PROGRAM_NAME_2;
81
    }
82
 
83
  /*  No known entry procedure found, the main program is probably
84
      not compiled with GPC.  */
85
  return NULL;
86
}
87
 
88
/* Determines if type TYPE is a pascal string type.
89
   Returns 1 if the type is a known pascal type
90
   This function is used by p-valprint.c code to allow better string display.
91
   If it is a pascal string type, then it also sets info needed
92
   to get the length and the data of the string
93
   length_pos, length_size and string_pos are given in bytes.
94
   char_size gives the element size in bytes.
95
   FIXME: if the position or the size of these fields
96
   are not multiple of TARGET_CHAR_BIT then the results are wrong
97
   but this does not happen for Free Pascal nor for GPC.  */
98
int
99
is_pascal_string_type (struct type *type,int *length_pos,
100
                       int *length_size, int *string_pos, int *char_size,
101
                       char **arrayname)
102
{
103
  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
104
    {
105
      /* Old Borland type pascal strings from Free Pascal Compiler.  */
106
      /* Two fields: length and st.  */
107
      if (TYPE_NFIELDS (type) == 2
108
          && strcmp (TYPE_FIELDS (type)[0].name, "length") == 0
109
          && strcmp (TYPE_FIELDS (type)[1].name, "st") == 0)
110
        {
111
          if (length_pos)
112
            *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
113
          if (length_size)
114
            *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));
115
          if (string_pos)
116
            *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
117
          if (char_size)
118
            *char_size = 1;
119
          if (arrayname)
120
            *arrayname = TYPE_FIELDS (type)[1].name;
121
         return 2;
122
        };
123
      /* GNU pascal strings.  */
124
      /* Three fields: Capacity, length and schema$ or _p_schema.  */
125
      if (TYPE_NFIELDS (type) == 3
126
          && strcmp (TYPE_FIELDS (type)[0].name, "Capacity") == 0
127
          && strcmp (TYPE_FIELDS (type)[1].name, "length") == 0)
128
        {
129
          if (length_pos)
130
            *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
131
          if (length_size)
132
            *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
133
          if (string_pos)
134
            *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
135
          /* FIXME: how can I detect wide chars in GPC ?? */
136
          if (char_size)
137
            *char_size = 1;
138
          if (arrayname)
139
            *arrayname = TYPE_FIELDS (type)[2].name;
140
         return 3;
141
        };
142
    }
143
  return 0;
144
}
145
 
146
static void pascal_one_char (int, struct ui_file *, int *);
147
 
148
/* Print the character C on STREAM as part of the contents of a literal
149
   string.
150
   In_quotes is reset to 0 if a char is written with #4 notation */
151
 
152
static void
153
pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
154
{
155
 
156
  c &= 0xFF;                    /* Avoid sign bit follies */
157
 
158
  if ((c == '\'') || (PRINT_LITERAL_FORM (c)))
159
    {
160
      if (!(*in_quotes))
161
        fputs_filtered ("'", stream);
162
      *in_quotes = 1;
163
      if (c == '\'')
164
        {
165
          fputs_filtered ("''", stream);
166
        }
167
      else
168
        fprintf_filtered (stream, "%c", c);
169
    }
170
  else
171
    {
172
      if (*in_quotes)
173
        fputs_filtered ("'", stream);
174
      *in_quotes = 0;
175
      fprintf_filtered (stream, "#%d", (unsigned int) c);
176
    }
177
}
178
 
179
static void pascal_emit_char (int c, struct ui_file *stream, int quoter);
180
 
181
/* Print the character C on STREAM as part of the contents of a literal
182
   string whose delimiter is QUOTER.  Note that that format for printing
183
   characters and strings is language specific. */
184
 
185
static void
186
pascal_emit_char (int c, struct ui_file *stream, int quoter)
187
{
188
  int in_quotes = 0;
189
  pascal_one_char (c, stream, &in_quotes);
190
  if (in_quotes)
191
    fputs_filtered ("'", stream);
192
}
193
 
194
void
195
pascal_printchar (int c, struct ui_file *stream)
196
{
197
  int in_quotes = 0;
198
  pascal_one_char (c, stream, &in_quotes);
199
  if (in_quotes)
200
    fputs_filtered ("'", stream);
201
}
202
 
203
/* Print the character string STRING, printing at most LENGTH characters.
204
   Printing stops early if the number hits print_max; repeat counts
205
   are printed as appropriate.  Print ellipses at the end if we
206
   had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.  */
207
 
208
void
209
pascal_printstr (struct ui_file *stream, const gdb_byte *string,
210
                 unsigned int length, int width, int force_ellipses)
211
{
212
  unsigned int i;
213
  unsigned int things_printed = 0;
214
  int in_quotes = 0;
215
  int need_comma = 0;
216
 
217
  /* If the string was not truncated due to `set print elements', and
218
     the last byte of it is a null, we don't print that, in traditional C
219
     style.  */
220
  if ((!force_ellipses) && length > 0 && string[length - 1] == '\0')
221
    length--;
222
 
223
  if (length == 0)
224
    {
225
      fputs_filtered ("''", stream);
226
      return;
227
    }
228
 
229
  for (i = 0; i < length && things_printed < print_max; ++i)
230
    {
231
      /* Position of the character we are examining
232
         to see whether it is repeated.  */
233
      unsigned int rep1;
234
      /* Number of repetitions we have detected so far.  */
235
      unsigned int reps;
236
 
237
      QUIT;
238
 
239
      if (need_comma)
240
        {
241
          fputs_filtered (", ", stream);
242
          need_comma = 0;
243
        }
244
 
245
      rep1 = i + 1;
246
      reps = 1;
247
      while (rep1 < length && string[rep1] == string[i])
248
        {
249
          ++rep1;
250
          ++reps;
251
        }
252
 
253
      if (reps > repeat_count_threshold)
254
        {
255
          if (in_quotes)
256
            {
257
              if (inspect_it)
258
                fputs_filtered ("\\', ", stream);
259
              else
260
                fputs_filtered ("', ", stream);
261
              in_quotes = 0;
262
            }
263
          pascal_printchar (string[i], stream);
264
          fprintf_filtered (stream, " <repeats %u times>", reps);
265
          i = rep1 - 1;
266
          things_printed += repeat_count_threshold;
267
          need_comma = 1;
268
        }
269
      else
270
        {
271
          int c = string[i];
272
          if ((!in_quotes) && (PRINT_LITERAL_FORM (c)))
273
            {
274
              if (inspect_it)
275
                fputs_filtered ("\\'", stream);
276
              else
277
                fputs_filtered ("'", stream);
278
              in_quotes = 1;
279
            }
280
          pascal_one_char (c, stream, &in_quotes);
281
          ++things_printed;
282
        }
283
    }
284
 
285
  /* Terminate the quotes if necessary.  */
286
  if (in_quotes)
287
    {
288
      if (inspect_it)
289
        fputs_filtered ("\\'", stream);
290
      else
291
        fputs_filtered ("'", stream);
292
    }
293
 
294
  if (force_ellipses || i < length)
295
    fputs_filtered ("...", stream);
296
}
297
 
298
 
299
/* Table mapping opcodes into strings for printing operators
300
   and precedences of the operators.  */
301
 
302
const struct op_print pascal_op_print_tab[] =
303
{
304
  {",", BINOP_COMMA, PREC_COMMA, 0},
305
  {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
306
  {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
307
  {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
308
  {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
309
  {"=", BINOP_EQUAL, PREC_EQUAL, 0},
310
  {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
311
  {"<=", BINOP_LEQ, PREC_ORDER, 0},
312
  {">=", BINOP_GEQ, PREC_ORDER, 0},
313
  {">", BINOP_GTR, PREC_ORDER, 0},
314
  {"<", BINOP_LESS, PREC_ORDER, 0},
315
  {"shr", BINOP_RSH, PREC_SHIFT, 0},
316
  {"shl", BINOP_LSH, PREC_SHIFT, 0},
317
  {"+", BINOP_ADD, PREC_ADD, 0},
318
  {"-", BINOP_SUB, PREC_ADD, 0},
319
  {"*", BINOP_MUL, PREC_MUL, 0},
320
  {"/", BINOP_DIV, PREC_MUL, 0},
321
  {"div", BINOP_INTDIV, PREC_MUL, 0},
322
  {"mod", BINOP_REM, PREC_MUL, 0},
323
  {"@", BINOP_REPEAT, PREC_REPEAT, 0},
324
  {"-", UNOP_NEG, PREC_PREFIX, 0},
325
  {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
326
  {"^", UNOP_IND, PREC_SUFFIX, 1},
327
  {"@", UNOP_ADDR, PREC_PREFIX, 0},
328
  {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
329
  {NULL, 0, 0, 0}
330
};
331
 
332
enum pascal_primitive_types {
333
  pascal_primitive_type_int,
334
  pascal_primitive_type_long,
335
  pascal_primitive_type_short,
336
  pascal_primitive_type_char,
337
  pascal_primitive_type_float,
338
  pascal_primitive_type_double,
339
  pascal_primitive_type_void,
340
  pascal_primitive_type_long_long,
341
  pascal_primitive_type_signed_char,
342
  pascal_primitive_type_unsigned_char,
343
  pascal_primitive_type_unsigned_short,
344
  pascal_primitive_type_unsigned_int,
345
  pascal_primitive_type_unsigned_long,
346
  pascal_primitive_type_unsigned_long_long,
347
  pascal_primitive_type_long_double,
348
  pascal_primitive_type_complex,
349
  pascal_primitive_type_double_complex,
350
  nr_pascal_primitive_types
351
};
352
 
353
static void
354
pascal_language_arch_info (struct gdbarch *gdbarch,
355
                           struct language_arch_info *lai)
356
{
357
  const struct builtin_type *builtin = builtin_type (gdbarch);
358
  lai->string_char_type = builtin->builtin_char;
359
  lai->primitive_type_vector
360
    = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
361
                              struct type *);
362
  lai->primitive_type_vector [pascal_primitive_type_int]
363
    = builtin->builtin_int;
364
  lai->primitive_type_vector [pascal_primitive_type_long]
365
    = builtin->builtin_long;
366
  lai->primitive_type_vector [pascal_primitive_type_short]
367
    = builtin->builtin_short;
368
  lai->primitive_type_vector [pascal_primitive_type_char]
369
    = builtin->builtin_char;
370
  lai->primitive_type_vector [pascal_primitive_type_float]
371
    = builtin->builtin_float;
372
  lai->primitive_type_vector [pascal_primitive_type_double]
373
    = builtin->builtin_double;
374
  lai->primitive_type_vector [pascal_primitive_type_void]
375
    = builtin->builtin_void;
376
  lai->primitive_type_vector [pascal_primitive_type_long_long]
377
    = builtin->builtin_long_long;
378
  lai->primitive_type_vector [pascal_primitive_type_signed_char]
379
    = builtin->builtin_signed_char;
380
  lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
381
    = builtin->builtin_unsigned_char;
382
  lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
383
    = builtin->builtin_unsigned_short;
384
  lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
385
    = builtin->builtin_unsigned_int;
386
  lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
387
    = builtin->builtin_unsigned_long;
388
  lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
389
    = builtin->builtin_unsigned_long_long;
390
  lai->primitive_type_vector [pascal_primitive_type_long_double]
391
    = builtin->builtin_long_double;
392
  lai->primitive_type_vector [pascal_primitive_type_complex]
393
    = builtin->builtin_complex;
394
  lai->primitive_type_vector [pascal_primitive_type_double_complex]
395
    = builtin->builtin_double_complex;
396
}
397
 
398
const struct language_defn pascal_language_defn =
399
{
400
  "pascal",                     /* Language name */
401
  language_pascal,
402
  range_check_on,
403
  type_check_on,
404
  case_sensitive_on,
405
  array_row_major,
406
  &exp_descriptor_standard,
407
  pascal_parse,
408
  pascal_error,
409
  null_post_parser,
410
  pascal_printchar,             /* Print a character constant */
411
  pascal_printstr,              /* Function to print string constant */
412
  pascal_emit_char,             /* Print a single char */
413
  pascal_print_type,            /* Print a type using appropriate syntax */
414
  pascal_val_print,             /* Print a value using appropriate syntax */
415
  pascal_value_print,           /* Print a top-level value */
416
  NULL,                         /* Language specific skip_trampoline */
417
  value_of_this,                /* value_of_this */
418
  basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
419
  basic_lookup_transparent_type,/* lookup_transparent_type */
420
  NULL,                         /* Language specific symbol demangler */
421
  NULL,                         /* Language specific class_name_from_physname */
422
  pascal_op_print_tab,          /* expression operators for printing */
423
  1,                            /* c-style arrays */
424
  0,                             /* String lower bound */
425
  default_word_break_characters,
426
  default_make_symbol_completion_list,
427
  pascal_language_arch_info,
428
  default_print_array_index,
429
  default_pass_by_reference,
430
  LANG_MAGIC
431
};
432
 
433
void
434
_initialize_pascal_language (void)
435
{
436
  add_language (&pascal_language_defn);
437
}

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