summaryrefslogtreecommitdiff
path: root/gdb/p-lang.c
blob: e83320ff4d38c6877b3f9035ca157ba14f96dbe6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
/* Pascal language support routines for GDB, the GNU debugger.

   Copyright (C) 2000-2013 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This file is derived from c-lang.c */

#include "defs.h"
#include <string.h>
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "varobj.h"
#include "p-lang.h"
#include "valprint.h"
#include "value.h"
#include <ctype.h>

extern void _initialize_pascal_language (void);


/* All GPC versions until now (2007-09-27) also define a symbol called
   '_p_initialize'.  Check for the presence of this symbol first.  */
static const char GPC_P_INITIALIZE[] = "_p_initialize";

/* The name of the symbol that GPC uses as the name of the main
   procedure (since version 20050212).  */
static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";

/* Older versions of GPC (versions older than 20050212) were using
   a different name for the main procedure.  */
static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";

/* Function returning the special symbol name used
   by GPC for the main procedure in the main program
   if it is found in minimal symbol list.
   This function tries to find minimal symbols generated by GPC
   so that it finds the even if the program was compiled
   without debugging information.
   According to information supplied by Waldeck Hebisch,
   this should work for all versions posterior to June 2000.  */

const char *
pascal_main_name (void)
{
  struct minimal_symbol *msym;

  msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);

  /*  If '_p_initialize' was not found, the main program is likely not
     written in Pascal.  */
  if (msym == NULL)
    return NULL;

  msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
  if (msym != NULL)
    {
      return GPC_MAIN_PROGRAM_NAME_1;
    }

  msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
  if (msym != NULL)
    {
      return GPC_MAIN_PROGRAM_NAME_2;
    }

  /*  No known entry procedure found, the main program is probably
      not compiled with GPC.  */
  return NULL;
}

/* Determines if type TYPE is a pascal string type.
   Returns a positive value if the type is a known pascal string type.
   This function is used by p-valprint.c code to allow better string display.
   If it is a pascal string type, then it also sets info needed
   to get the length and the data of the string
   length_pos, length_size and string_pos are given in bytes.
   char_size gives the element size in bytes.
   FIXME: if the position or the size of these fields
   are not multiple of TARGET_CHAR_BIT then the results are wrong
   but this does not happen for Free Pascal nor for GPC.  */
int
is_pascal_string_type (struct type *type,int *length_pos,
                       int *length_size, int *string_pos,
		       struct type **char_type,
		       const char **arrayname)
{
  if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT)
    {
      /* Old Borland type pascal strings from Free Pascal Compiler.  */
      /* Two fields: length and st.  */
      if (TYPE_NFIELDS (type) == 2
	  && TYPE_FIELD_NAME (type, 0)
	  && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
	  && TYPE_FIELD_NAME (type, 1)
	  && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0)
        {
          if (length_pos)
	    *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
          if (length_size)
	    *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));
          if (string_pos)
	    *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
          if (char_type)
	    *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1));
 	  if (arrayname)
	    *arrayname = TYPE_FIELD_NAME (type, 1);
         return 2;
        };
      /* GNU pascal strings.  */
      /* Three fields: Capacity, length and schema$ or _p_schema.  */
      if (TYPE_NFIELDS (type) == 3
	  && TYPE_FIELD_NAME (type, 0)
	  && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0
	  && TYPE_FIELD_NAME (type, 1)
	  && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0)
        {
	  if (length_pos)
	    *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
	  if (length_size)
	    *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
	  if (string_pos)
	    *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
          /* FIXME: how can I detect wide chars in GPC ??  */
          if (char_type)
	    {
	      *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2));

	      if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY)
		*char_type = TYPE_TARGET_TYPE (*char_type);
	    }
 	  if (arrayname)
	    *arrayname = TYPE_FIELD_NAME (type, 2);
         return 3;
        };
    }
  return 0;
}

static void pascal_one_char (int, struct ui_file *, int *);

/* Print the character C on STREAM as part of the contents of a literal
   string.
   In_quotes is reset to 0 if a char is written with #4 notation.  */

static void
pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
{
  if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
    {
      if (!(*in_quotes))
	fputs_filtered ("'", stream);
      *in_quotes = 1;
      if (c == '\'')
	{
	  fputs_filtered ("''", stream);
	}
      else
	fprintf_filtered (stream, "%c", c);
    }
  else
    {
      if (*in_quotes)
	fputs_filtered ("'", stream);
      *in_quotes = 0;
      fprintf_filtered (stream, "#%d", (unsigned int) c);
    }
}

static void pascal_emit_char (int c, struct type *type,
			      struct ui_file *stream, int quoter);

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  Note that that format for printing
   characters and strings is language specific.  */

static void
pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
{
  int in_quotes = 0;

  pascal_one_char (c, stream, &in_quotes);
  if (in_quotes)
    fputs_filtered ("'", stream);
}

void
pascal_printchar (int c, struct type *type, struct ui_file *stream)
{
  int in_quotes = 0;

  pascal_one_char (c, stream, &in_quotes);
  if (in_quotes)
    fputs_filtered ("'", stream);
}

/* Print the character string STRING, printing at most LENGTH characters.
   Printing stops early if the number hits print_max; repeat counts
   are printed as appropriate.  Print ellipses at the end if we
   had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.  */

void
pascal_printstr (struct ui_file *stream, struct type *type,
		 const gdb_byte *string, unsigned int length,
		 const char *encoding, int force_ellipses,
		 const struct value_print_options *options)
{
  enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
  unsigned int i;
  unsigned int things_printed = 0;
  int in_quotes = 0;
  int need_comma = 0;
  int width;

  /* Preserve TYPE's original type, just set its LENGTH.  */
  check_typedef (type);
  width = TYPE_LENGTH (type);

  /* If the string was not truncated due to `set print elements', and
     the last byte of it is a null, we don't print that, in traditional C
     style.  */
  if ((!force_ellipses) && length > 0
	&& extract_unsigned_integer (string + (length - 1) * width, width,
				     byte_order) == 0)
    length--;

  if (length == 0)
    {
      fputs_filtered ("''", stream);
      return;
    }

  for (i = 0; i < length && things_printed < options->print_max; ++i)
    {
      /* Position of the character we are examining
         to see whether it is repeated.  */
      unsigned int rep1;
      /* Number of repetitions we have detected so far.  */
      unsigned int reps;
      unsigned long int current_char;

      QUIT;

      if (need_comma)
	{
	  fputs_filtered (", ", stream);
	  need_comma = 0;
	}

      current_char = extract_unsigned_integer (string + i * width, width,
					       byte_order);

      rep1 = i + 1;
      reps = 1;
      while (rep1 < length
	     && extract_unsigned_integer (string + rep1 * width, width,
					  byte_order) == current_char)
	{
	  ++rep1;
	  ++reps;
	}

      if (reps > options->repeat_count_threshold)
	{
	  if (in_quotes)
	    {
	      fputs_filtered ("', ", stream);
	      in_quotes = 0;
	    }
	  pascal_printchar (current_char, type, stream);
	  fprintf_filtered (stream, " <repeats %u times>", reps);
	  i = rep1 - 1;
	  things_printed += options->repeat_count_threshold;
	  need_comma = 1;
	}
      else
	{
	  if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
	    {
	      fputs_filtered ("'", stream);
	      in_quotes = 1;
	    }
	  pascal_one_char (current_char, stream, &in_quotes);
	  ++things_printed;
	}
    }

  /* Terminate the quotes if necessary.  */
  if (in_quotes)
    fputs_filtered ("'", stream);

  if (force_ellipses || i < length)
    fputs_filtered ("...", stream);
}


/* Table mapping opcodes into strings for printing operators
   and precedences of the operators.  */

const struct op_print pascal_op_print_tab[] =
{
  {",", BINOP_COMMA, PREC_COMMA, 0},
  {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
  {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
  {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
  {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
  {"=", BINOP_EQUAL, PREC_EQUAL, 0},
  {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  {"<=", BINOP_LEQ, PREC_ORDER, 0},
  {">=", BINOP_GEQ, PREC_ORDER, 0},
  {">", BINOP_GTR, PREC_ORDER, 0},
  {"<", BINOP_LESS, PREC_ORDER, 0},
  {"shr", BINOP_RSH, PREC_SHIFT, 0},
  {"shl", BINOP_LSH, PREC_SHIFT, 0},
  {"+", BINOP_ADD, PREC_ADD, 0},
  {"-", BINOP_SUB, PREC_ADD, 0},
  {"*", BINOP_MUL, PREC_MUL, 0},
  {"/", BINOP_DIV, PREC_MUL, 0},
  {"div", BINOP_INTDIV, PREC_MUL, 0},
  {"mod", BINOP_REM, PREC_MUL, 0},
  {"@", BINOP_REPEAT, PREC_REPEAT, 0},
  {"-", UNOP_NEG, PREC_PREFIX, 0},
  {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
  {"^", UNOP_IND, PREC_SUFFIX, 1},
  {"@", UNOP_ADDR, PREC_PREFIX, 0},
  {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
  {NULL, 0, 0, 0}
};

enum pascal_primitive_types {
  pascal_primitive_type_int,
  pascal_primitive_type_long,
  pascal_primitive_type_short,
  pascal_primitive_type_char,
  pascal_primitive_type_float,
  pascal_primitive_type_double,
  pascal_primitive_type_void,
  pascal_primitive_type_long_long,
  pascal_primitive_type_signed_char,
  pascal_primitive_type_unsigned_char,
  pascal_primitive_type_unsigned_short,
  pascal_primitive_type_unsigned_int,
  pascal_primitive_type_unsigned_long,
  pascal_primitive_type_unsigned_long_long,
  pascal_primitive_type_long_double,
  pascal_primitive_type_complex,
  pascal_primitive_type_double_complex,
  nr_pascal_primitive_types
};

static void
pascal_language_arch_info (struct gdbarch *gdbarch,
			   struct language_arch_info *lai)
{
  const struct builtin_type *builtin = builtin_type (gdbarch);

  lai->string_char_type = builtin->builtin_char;
  lai->primitive_type_vector
    = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
                              struct type *);
  lai->primitive_type_vector [pascal_primitive_type_int]
    = builtin->builtin_int;
  lai->primitive_type_vector [pascal_primitive_type_long]
    = builtin->builtin_long;
  lai->primitive_type_vector [pascal_primitive_type_short]
    = builtin->builtin_short;
  lai->primitive_type_vector [pascal_primitive_type_char]
    = builtin->builtin_char;
  lai->primitive_type_vector [pascal_primitive_type_float]
    = builtin->builtin_float;
  lai->primitive_type_vector [pascal_primitive_type_double]
    = builtin->builtin_double;
  lai->primitive_type_vector [pascal_primitive_type_void]
    = builtin->builtin_void;
  lai->primitive_type_vector [pascal_primitive_type_long_long]
    = builtin->builtin_long_long;
  lai->primitive_type_vector [pascal_primitive_type_signed_char]
    = builtin->builtin_signed_char;
  lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
    = builtin->builtin_unsigned_char;
  lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
    = builtin->builtin_unsigned_short;
  lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
    = builtin->builtin_unsigned_int;
  lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
    = builtin->builtin_unsigned_long;
  lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
    = builtin->builtin_unsigned_long_long;
  lai->primitive_type_vector [pascal_primitive_type_long_double]
    = builtin->builtin_long_double;
  lai->primitive_type_vector [pascal_primitive_type_complex]
    = builtin->builtin_complex;
  lai->primitive_type_vector [pascal_primitive_type_double_complex]
    = builtin->builtin_double_complex;

  lai->bool_type_symbol = "boolean";
  lai->bool_type_default = builtin->builtin_bool;
}

const struct language_defn pascal_language_defn =
{
  "pascal",			/* Language name */
  "Pascal",
  language_pascal,
  range_check_on,
  case_sensitive_on,
  array_row_major,
  macro_expansion_no,
  &exp_descriptor_standard,
  pascal_parse,
  pascal_error,
  null_post_parser,
  pascal_printchar,		/* Print a character constant */
  pascal_printstr,		/* Function to print string constant */
  pascal_emit_char,		/* Print a single char */
  pascal_print_type,		/* Print a type using appropriate syntax */
  pascal_print_typedef,		/* Print a typedef using appropriate syntax */
  pascal_val_print,		/* Print a value using appropriate syntax */
  pascal_value_print,		/* Print a top-level value */
  default_read_var_value,	/* la_read_var_value */
  NULL,				/* Language specific skip_trampoline */
  "this",		        /* name_of_this */
  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  NULL,				/* Language specific symbol demangler */
  NULL,				/* Language specific class_name_from_physname */
  pascal_op_print_tab,		/* expression operators for printing */
  1,				/* c-style arrays */
  0,				/* String lower bound */
  default_word_break_characters,
  default_make_symbol_completion_list,
  pascal_language_arch_info,
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  NULL,				/* la_get_symbol_name_cmp */
  iterate_over_symbols,
  &default_varobj_ops,
  LANG_MAGIC
};

void
_initialize_pascal_language (void)
{
  add_language (&pascal_language_defn);
}