aboutsummaryrefslogtreecommitdiff
path: root/gdb/language.h
blob: 9484e0be9de2b74831e8722d6fb767a1aebb25b2 (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
/* Source-language-related definitions for GDB.
   Copyright 1991, 1992 Free Software Foundation, Inc.
   Contributed by the Department of Computer Science at the State University
   of New York at Buffalo.

   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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#if !defined (LANGUAGE_H)
#define LANGUAGE_H 1

/* Forward decls for prototypes */
struct value;
struct objfile;
struct expression;
/* enum exp_opcode;     ANSI's `wisdom' didn't include forward enum decls. */

/* This used to be included to configure GDB for one or more specific
   languages.  Now it is shortcutted to configure for all of them.  FIXME.  */
/* #include "lang_def.h" */
#define	_LANG_c
#define	_LANG_m2
#define	_LANG_chill
#define _LANG_fortran

#define MAX_FORTRAN_DIMS  7	/* Maximum number of F77 array dims */

/* range_mode ==
   range_mode_auto:   range_check set automatically to default of language.
   range_mode_manual: range_check set manually by user.  */

extern enum range_mode
  {
    range_mode_auto, range_mode_manual
  }
range_mode;

/* range_check ==
   range_check_on:    Ranges are checked in GDB expressions, producing errors.
   range_check_warn:  Ranges are checked, producing warnings.
   range_check_off:   Ranges are not checked in GDB expressions.  */

extern enum range_check
  {
    range_check_off, range_check_warn, range_check_on
  }
range_check;

/* type_mode ==
   type_mode_auto:   type_check set automatically to default of language
   type_mode_manual: type_check set manually by user. */

extern enum type_mode
  {
    type_mode_auto, type_mode_manual
  }
type_mode;

/* type_check ==
   type_check_on:    Types are checked in GDB expressions, producing errors.
   type_check_warn:  Types are checked, producing warnings.
   type_check_off:   Types are not checked in GDB expressions.  */

extern enum type_check
  {
    type_check_off, type_check_warn, type_check_on
  }
type_check;

/* Information for doing language dependent formatting of printed values. */

struct language_format_info
  {
    /* The format that can be passed directly to standard C printf functions
       to generate a completely formatted value in the format appropriate for
       the language. */

    char *la_format;

    /* The prefix to be used when directly printing a value, or constructing
       a standard C printf format.  This generally is everything up to the
       conversion specification (the part introduced by the '%' character
       and terminated by the conversion specifier character). */

    char *la_format_prefix;

    /* The conversion specifier.  This is generally everything after the
       field width and precision, typically only a single character such
       as 'o' for octal format or 'x' for hexadecimal format. */

    char *la_format_specifier;

    /* The suffix to be used when directly printing a value, or constructing
       a standard C printf format.  This generally is everything after the
       conversion specification (the part introduced by the '%' character
       and terminated by the conversion specifier character). */

    char *la_format_suffix;	/* Suffix for custom format string */
  };

/* Structure tying together assorted information about a language.  */

struct language_defn
  {
    /* Name of the language */

    char *la_name;

    /* its symtab language-enum (defs.h) */

    enum language la_language;

    /* Its builtin types.  This is a vector ended by a NULL pointer.  These
       types can be specified by name in parsing types in expressions,
       regardless of whether the program being debugged actually defines
       such a type.  */

    struct type **const *la_builtin_type_vector;

    /* Default range checking */

    enum range_check la_range_check;

    /* Default type checking */

    enum type_check la_type_check;

    /* Parser function. */

    int (*la_parser) PARAMS ((void));

    /* Parser error function */

    void (*la_error) PARAMS ((char *));

    /* Evaluate an expression. */
    struct value *(*evaluate_exp) PARAMS ((struct type *, struct expression *,
					   int *, enum noside));

    void (*la_printchar) PARAMS ((int ch, GDB_FILE * stream));

    void (*la_printstr) PARAMS ((GDB_FILE * stream, char *string,
				 unsigned int length, int width,
				 int force_ellipses));

    void (*la_emitchar) PARAMS ((int ch, GDB_FILE * stream, int quoter));

    struct type *(*la_fund_type) PARAMS ((struct objfile *, int));

    /* Print a type using syntax appropriate for this language. */

    void (*la_print_type) PARAMS ((struct type *, char *, GDB_FILE *, int, int));

    /* Print a value using syntax appropriate for this language. */

    int (*la_val_print) PARAMS ((struct type *, char *, int, CORE_ADDR, GDB_FILE *,
				 int, int, int, enum val_prettyprint));

    /* Print a top-level value using syntax appropriate for this language. */

    int (*la_value_print) PARAMS ((struct value *, GDB_FILE *,
				   int, enum val_prettyprint));

    /* Base 2 (binary) formats. */

    struct language_format_info la_binary_format;

    /* Base 8 (octal) formats. */

    struct language_format_info la_octal_format;

    /* Base 10 (decimal) formats */

    struct language_format_info la_decimal_format;

    /* Base 16 (hexadecimal) formats */

    struct language_format_info la_hex_format;

    /* Table for printing expressions */

    const struct op_print *la_op_print_tab;

    /* Zero if the language has first-class arrays.  True if there are no
       array values, and array objects decay to pointers, as in C. */

    char c_style_arrays;

    /* Index to use for extracting the first element of a string. */
    char string_lower_bound;

    /* Type of elements of strings. */
    struct type **string_char_type;

    /* Add fields above this point, so the magic number is always last. */
    /* Magic number for compat checking */

    long la_magic;

  };

#define LANG_MAGIC	910823L

/* Pointer to the language_defn for our current language.  This pointer
   always points to *some* valid struct; it can be used without checking
   it for validity.

   The current language affects expression parsing and evaluation
   (FIXME: it might be cleaner to make the evaluation-related stuff
   separate exp_opcodes for each different set of semantics.  We
   should at least think this through more clearly with respect to
   what happens if the language is changed between parsing and
   evaluation) and printing of things like types and arrays.  It does
   *not* affect symbol-reading-- each source file in a symbol-file has
   its own language and we should keep track of that regardless of the
   language when symbols are read.  If we want some manual setting for
   the language of symbol files (e.g. detecting when ".c" files are
   C++), it should be a seprate setting from the current_language.  */

extern const struct language_defn *current_language;

/* Pointer to the language_defn expected by the user, e.g. the language
   of main(), or the language we last mentioned in a message, or C.  */

extern const struct language_defn *expected_language;

/* language_mode == 
   language_mode_auto:   current_language automatically set upon selection
   of scope (e.g. stack frame)
   language_mode_manual: current_language set only by user.  */

extern enum language_mode
  {
    language_mode_auto, language_mode_manual
  }
language_mode;

/* These macros define the behaviour of the expression 
   evaluator.  */

/* Should we strictly type check expressions? */
#define STRICT_TYPE (type_check != type_check_off)

/* Should we range check values against the domain of their type? */
#define RANGE_CHECK (range_check != range_check_off)

/* "cast" really means conversion */
/* FIXME -- should be a setting in language_defn */
#define CAST_IS_CONVERSION (current_language->la_language == language_c  || \
			    current_language->la_language == language_cplus)

extern void
language_info PARAMS ((int));

extern enum language
set_language PARAMS ((enum language));


/* This page contains functions that return things that are
   specific to languages.  Each of these functions is based on
   the current setting of working_lang, which the user sets
   with the "set language" command. */

#define create_fundamental_type(objfile,typeid) \
  (current_language->la_fund_type(objfile, typeid))

#define LA_PRINT_TYPE(type,varstring,stream,show,level) \
  (current_language->la_print_type(type,varstring,stream,show,level))

#define LA_VAL_PRINT(type,valaddr,offset,addr,stream,fmt,deref,recurse,pretty) \
  (current_language->la_val_print(type,valaddr,offset,addr,stream,fmt,deref, \
				  recurse,pretty))
#define LA_VALUE_PRINT(val,stream,fmt,pretty) \
  (current_language->la_value_print(val,stream,fmt,pretty))

/* Return a format string for printf that will print a number in one of
   the local (language-specific) formats.  Result is static and is
   overwritten by the next call.  Takes printf options like "08" or "l"
   (to produce e.g. %08x or %lx).  */

#define local_binary_format() \
  (current_language->la_binary_format.la_format)
#define local_binary_format_prefix() \
  (current_language->la_binary_format.la_format_prefix)
#define local_binary_format_specifier() \
  (current_language->la_binary_format.la_format_specifier)
#define local_binary_format_suffix() \
  (current_language->la_binary_format.la_format_suffix)

#define local_octal_format() \
  (current_language->la_octal_format.la_format)
#define local_octal_format_prefix() \
  (current_language->la_octal_format.la_format_prefix)
#define local_octal_format_specifier() \
  (current_language->la_octal_format.la_format_specifier)
#define local_octal_format_suffix() \
  (current_language->la_octal_format.la_format_suffix)

#define local_decimal_format() \
  (current_language->la_decimal_format.la_format)
#define local_decimal_format_prefix() \
  (current_language->la_decimal_format.la_format_prefix)
#define local_decimal_format_specifier() \
  (current_language->la_decimal_format.la_format_specifier)
#define local_decimal_format_suffix() \
  (current_language->la_decimal_format.la_format_suffix)

#define local_hex_format() \
  (current_language->la_hex_format.la_format)
#define local_hex_format_prefix() \
  (current_language->la_hex_format.la_format_prefix)
#define local_hex_format_specifier() \
  (current_language->la_hex_format.la_format_specifier)
#define local_hex_format_suffix() \
  (current_language->la_hex_format.la_format_suffix)

#define LA_PRINT_CHAR(ch, stream) \
  (current_language->la_printchar(ch, stream))
#define LA_PRINT_STRING(stream, string, length, width, force_ellipses) \
  (current_language->la_printstr(stream, string, length, width, force_ellipses))
#define LA_EMIT_CHAR(ch, stream, quoter) \
  (current_language->la_emitchar(ch, stream, quoter))

/* Test a character to decide whether it can be printed in literal form
   or needs to be printed in another representation.  For example,
   in C the literal form of the character with octal value 141 is 'a'
   and the "other representation" is '\141'.  The "other representation"
   is program language dependent. */

#define PRINT_LITERAL_FORM(c)		\
  ((c) >= 0x20				\
   && ((c) < 0x7F || (c) >= 0xA0)	\
   && (!sevenbit_strings || (c) < 0x80))

/* Return a format string for printf that will print a number in one of
   the local (language-specific) formats.  Result is static and is
   overwritten by the next call.  Takes printf options like "08" or "l"
   (to produce e.g. %08x or %lx).  */

extern char *
  local_decimal_format_custom PARAMS ((char *));	/* language.c */

extern char *
  local_octal_format_custom PARAMS ((char *));	/* language.c */

extern char *
  local_hex_format_custom PARAMS ((char *));	/* language.c */

/* Return a string that contains a number formatted in one of the local
   (language-specific) formats.  Result is static and is overwritten by
   the next call.  Takes printf options like "08" or "l".  */

extern char *
  local_hex_string PARAMS ((unsigned long));	/* language.c */

extern char *
  local_hex_string_custom PARAMS ((unsigned long, char *));	/* language.c */

/* Type predicates */

extern int
simple_type PARAMS ((struct type *));

extern int
ordered_type PARAMS ((struct type *));

extern int
same_type PARAMS ((struct type *, struct type *));

extern int
integral_type PARAMS ((struct type *));

extern int
numeric_type PARAMS ((struct type *));

extern int
character_type PARAMS ((struct type *));

extern int
boolean_type PARAMS ((struct type *));

extern int
float_type PARAMS ((struct type *));

extern int
pointer_type PARAMS ((struct type *));

extern int
structured_type PARAMS ((struct type *));

/* Checks Binary and Unary operations for semantic type correctness */
/* FIXME:  Does not appear to be used */
#define unop_type_check(v,o) binop_type_check((v),NULL,(o))

extern void
binop_type_check PARAMS ((struct value *, struct value *, int));

/* Error messages */

extern void
op_error PARAMS ((char *fmt, enum exp_opcode, int));

#define type_op_error(f,o) \
   op_error((f),(o),type_check==type_check_on ? 1 : 0)
#define range_op_error(f,o) \
   op_error((f),(o),range_check==range_check_on ? 1 : 0)

extern void
  type_error
PARAMS ((char *,...))
ATTR_FORMAT (printf, 1, 2);

     void
     range_error PARAMS ((char *,...))
  ATTR_FORMAT (printf, 1, 2);

/* Data:  Does this value represent "truth" to the current language?  */

     extern int
     value_true PARAMS ((struct value *));

     extern struct type *lang_bool_type PARAMS ((void));

/* The type used for Boolean values in the current language. */
#define LA_BOOL_TYPE lang_bool_type ()

/* Misc:  The string representing a particular enum language.  */

     extern enum language language_enum PARAMS ((char *str));

     extern const struct language_defn *language_def PARAMS ((enum language));

     extern char *language_str PARAMS ((enum language));

/* Add a language to the set known by GDB (at initialization time).  */

     extern void
     add_language PARAMS ((const struct language_defn *));

     extern enum language
     get_frame_language PARAMS ((void));	/* In stack.c */

#endif /* defined (LANGUAGE_H) */