aboutsummaryrefslogtreecommitdiff
path: root/gcc/cp/lex.c
blob: 5eb182d3caf21b5d63b63f2f75e3ddfb192df2e2 (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
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
/* Separate lexical analyzer for GNU C++.
   Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
   Free Software Foundation, Inc.
   Hacked by Michael Tiemann (tiemann@cygnus.com)

This file is part of GCC.

GCC 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, or (at your option)
any later version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */


/* This file is the lexical analyzer for GNU C++.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "input.h"
#include "tree.h"
#include "cp-tree.h"
#include "cpplib.h"
#include "flags.h"
#include "c-pragma.h"
#include "toplev.h"
#include "output.h"
#include "tm_p.h"
#include "timevar.h"

static int interface_strcmp (const char *);
static void init_cp_pragma (void);

static tree parse_strconst_pragma (const char *, int);
static void handle_pragma_vtable (cpp_reader *);
static void handle_pragma_unit (cpp_reader *);
static void handle_pragma_interface (cpp_reader *);
static void handle_pragma_implementation (cpp_reader *);
static void handle_pragma_java_exceptions (cpp_reader *);

static void init_operators (void);
static void copy_lang_type (tree);

/* A constraint that can be tested at compile time.  */
#define CONSTRAINT(name, expr) extern int constraint_##name [(expr) ? 1 : -1]

/* Functions and data structures for #pragma interface.

   `#pragma implementation' means that the main file being compiled
   is considered to implement (provide) the classes that appear in
   its main body.  I.e., if this is file "foo.cc", and class `bar'
   is defined in "foo.cc", then we say that "foo.cc implements bar".

   All main input files "implement" themselves automagically.

   `#pragma interface' means that unless this file (of the form "foo.h"
   is not presently being included by file "foo.cc", the
   CLASSTYPE_INTERFACE_ONLY bit gets set.  The effect is that none
   of the vtables nor any of the inline functions defined in foo.h
   will ever be output.

   There are cases when we want to link files such as "defs.h" and
   "main.cc".  In this case, we give "defs.h" a `#pragma interface',
   and "main.cc" has `#pragma implementation "defs.h"'.  */

struct impl_files
{
  const char *filename;
  struct impl_files *next;
};

static struct impl_files *impl_file_chain;

/* True if we saw "#pragma GCC java_exceptions".  */
bool pragma_java_exceptions;

void
cxx_finish (void)
{
  c_common_finish ();
}

/* A mapping from tree codes to operator name information.  */
operator_name_info_t operator_name_info[(int) MAX_TREE_CODES];
/* Similar, but for assignment operators.  */
operator_name_info_t assignment_operator_name_info[(int) MAX_TREE_CODES];

/* Initialize data structures that keep track of operator names.  */

#define DEF_OPERATOR(NAME, C, M, AR, AP) \
 CONSTRAINT (C, sizeof "operator " + sizeof NAME <= 256);
#include "operators.def"
#undef DEF_OPERATOR

static void
init_operators (void)
{
  tree identifier;
  char buffer[256];
  struct operator_name_info_t *oni;

#define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P)		    \
  sprintf (buffer, ISALPHA (NAME[0]) ? "operator %s" : "operator%s", NAME); \
  identifier = get_identifier (buffer);					    \
  IDENTIFIER_OPNAME_P (identifier) = 1;					    \
									    \
  oni = (ASSN_P								    \
	 ? &assignment_operator_name_info[(int) CODE]			    \
	 : &operator_name_info[(int) CODE]);				    \
  oni->identifier = identifier;						    \
  oni->name = NAME;							    \
  oni->mangled_name = MANGLING;						    \
  oni->arity = ARITY;

#include "operators.def"
#undef DEF_OPERATOR

  operator_name_info[(int) ERROR_MARK].identifier
    = get_identifier ("<invalid operator>");

  /* Handle some special cases.  These operators are not defined in
     the language, but can be produced internally.  We may need them
     for error-reporting.  (Eventually, we should ensure that this
     does not happen.  Error messages involving these operators will
     be confusing to users.)  */

  operator_name_info [(int) INIT_EXPR].name
    = operator_name_info [(int) MODIFY_EXPR].name;
  operator_name_info [(int) EXACT_DIV_EXPR].name = "(ceiling /)";
  operator_name_info [(int) CEIL_DIV_EXPR].name = "(ceiling /)";
  operator_name_info [(int) FLOOR_DIV_EXPR].name = "(floor /)";
  operator_name_info [(int) ROUND_DIV_EXPR].name = "(round /)";
  operator_name_info [(int) CEIL_MOD_EXPR].name = "(ceiling %)";
  operator_name_info [(int) FLOOR_MOD_EXPR].name = "(floor %)";
  operator_name_info [(int) ROUND_MOD_EXPR].name = "(round %)";
  operator_name_info [(int) ABS_EXPR].name = "abs";
  operator_name_info [(int) TRUTH_AND_EXPR].name = "strict &&";
  operator_name_info [(int) TRUTH_OR_EXPR].name = "strict ||";
  operator_name_info [(int) RANGE_EXPR].name = "...";
  operator_name_info [(int) UNARY_PLUS_EXPR].name = "+";

  assignment_operator_name_info [(int) EXACT_DIV_EXPR].name
    = "(exact /=)";
  assignment_operator_name_info [(int) CEIL_DIV_EXPR].name
    = "(ceiling /=)";
  assignment_operator_name_info [(int) FLOOR_DIV_EXPR].name
    = "(floor /=)";
  assignment_operator_name_info [(int) ROUND_DIV_EXPR].name
    = "(round /=)";
  assignment_operator_name_info [(int) CEIL_MOD_EXPR].name
    = "(ceiling %=)";
  assignment_operator_name_info [(int) FLOOR_MOD_EXPR].name
    = "(floor %=)";
  assignment_operator_name_info [(int) ROUND_MOD_EXPR].name
    = "(round %=)";
}

/* Initialize the reserved words.  */

void
init_reswords (void)
{
  unsigned int i;
  tree id;
  int mask = 0;

  if (cxx_dialect != cxx0x)
    mask |= D_CXX0X;
  if (flag_no_asm)
    mask |= D_ASM | D_EXT;
  if (flag_no_gnu_keywords)
    mask |= D_EXT;

  /* The Objective-C keywords are all context-dependent.  */
  mask |= D_OBJC;

  ridpointers = GGC_CNEWVEC (tree, (int) RID_MAX);
  for (i = 0; i < num_c_common_reswords; i++)
    {
      if (c_common_reswords[i].disable & D_CONLY)
	continue;
      id = get_identifier (c_common_reswords[i].word);
      C_SET_RID_CODE (id, c_common_reswords[i].rid);
      ridpointers [(int) c_common_reswords[i].rid] = id;
      if (! (c_common_reswords[i].disable & mask))
	C_IS_RESERVED_WORD (id) = 1;
    }
}

static void
init_cp_pragma (void)
{
  c_register_pragma (0, "vtable", handle_pragma_vtable);
  c_register_pragma (0, "unit", handle_pragma_unit);
  c_register_pragma (0, "interface", handle_pragma_interface);
  c_register_pragma (0, "implementation", handle_pragma_implementation);
  c_register_pragma ("GCC", "interface", handle_pragma_interface);
  c_register_pragma ("GCC", "implementation", handle_pragma_implementation);
  c_register_pragma ("GCC", "java_exceptions", handle_pragma_java_exceptions);
}

/* TRUE if a code represents a statement.  */

bool statement_code_p[MAX_TREE_CODES];

/* Initialize the C++ front end.  This function is very sensitive to
   the exact order that things are done here.  It would be nice if the
   initialization done by this routine were moved to its subroutines,
   and the ordering dependencies clarified and reduced.  */
bool
cxx_init (void)
{
  location_t saved_loc;
  unsigned int i;
  static const enum tree_code stmt_codes[] = {
   CTOR_INITIALIZER,	TRY_BLOCK,	HANDLER,
   EH_SPEC_BLOCK,	USING_STMT,	TAG_DEFN,
   IF_STMT,		CLEANUP_STMT,	FOR_STMT,
   WHILE_STMT,		DO_STMT,	BREAK_STMT,
   CONTINUE_STMT,	SWITCH_STMT,	EXPR_STMT
  };

  memset (&statement_code_p, 0, sizeof (statement_code_p));
  for (i = 0; i < ARRAY_SIZE (stmt_codes); i++)
    statement_code_p[stmt_codes[i]] = true;

  saved_loc = input_location;
  input_location = BUILTINS_LOCATION;

  init_reswords ();
  init_tree ();
  init_cp_semantics ();
  init_operators ();
  init_method ();
  init_error ();

  current_function_decl = NULL;

  class_type_node = ridpointers[(int) RID_CLASS];

  cxx_init_decl_processing ();

  if (c_common_init () == false)
    {
      input_location = saved_loc;
      return false;
    }

  init_cp_pragma ();

  init_repo ();

  input_location = saved_loc;
  return true;
}

/* Return nonzero if S is not considered part of an
   INTERFACE/IMPLEMENTATION pair.  Otherwise, return 0.  */

static int
interface_strcmp (const char* s)
{
  /* Set the interface/implementation bits for this scope.  */
  struct impl_files *ifiles;
  const char *s1;

  for (ifiles = impl_file_chain; ifiles; ifiles = ifiles->next)
    {
      const char *t1 = ifiles->filename;
      s1 = s;

      if (*s1 != *t1 || *s1 == 0)
	continue;

      while (*s1 == *t1 && *s1 != 0)
	s1++, t1++;

      /* A match.  */
      if (*s1 == *t1)
	return 0;

      /* Don't get faked out by xxx.yyy.cc vs xxx.zzz.cc.  */
      if (strchr (s1, '.') || strchr (t1, '.'))
	continue;

      if (*s1 == '\0' || s1[-1] != '.' || t1[-1] != '.')
	continue;

      /* A match.  */
      return 0;
    }

  /* No matches.  */
  return 1;
}



/* Parse a #pragma whose sole argument is a string constant.
   If OPT is true, the argument is optional.  */
static tree
parse_strconst_pragma (const char* name, int opt)
{
  tree result, x;
  enum cpp_ttype t;

  t = pragma_lex (&result);
  if (t == CPP_STRING)
    {
      if (pragma_lex (&x) != CPP_EOF)
	warning (0, "junk at end of #pragma %s", name);
      return result;
    }

  if (t == CPP_EOF && opt)
    return NULL_TREE;

  error ("invalid #pragma %s", name);
  return error_mark_node;
}

static void
handle_pragma_vtable (cpp_reader* dfile ATTRIBUTE_UNUSED )
{
  parse_strconst_pragma ("vtable", 0);
  sorry ("#pragma vtable no longer supported");
}

static void
handle_pragma_unit (cpp_reader* dfile ATTRIBUTE_UNUSED )
{
  /* Validate syntax, but don't do anything.  */
  parse_strconst_pragma ("unit", 0);
}

static void
handle_pragma_interface (cpp_reader* dfile ATTRIBUTE_UNUSED )
{
  tree fname = parse_strconst_pragma ("interface", 1);
  struct c_fileinfo *finfo;
  const char *filename;

  if (fname == error_mark_node)
    return;
  else if (fname == 0)
    filename = lbasename (input_filename);
  else
    filename = TREE_STRING_POINTER (fname);

  finfo = get_fileinfo (input_filename);

  if (impl_file_chain == 0)
    {
      /* If this is zero at this point, then we are
	 auto-implementing.  */
      if (main_input_filename == 0)
	main_input_filename = input_filename;
    }

  finfo->interface_only = interface_strcmp (filename);
  /* If MULTIPLE_SYMBOL_SPACES is set, we cannot assume that we can see
     a definition in another file.  */
  if (!MULTIPLE_SYMBOL_SPACES || !finfo->interface_only)
    finfo->interface_unknown = 0;
}

/* Note that we have seen a #pragma implementation for the key MAIN_FILENAME.
   We used to only allow this at toplevel, but that restriction was buggy
   in older compilers and it seems reasonable to allow it in the headers
   themselves, too.  It only needs to precede the matching #p interface.

   We don't touch finfo->interface_only or finfo->interface_unknown;
   the user must specify a matching #p interface for this to have
   any effect.  */

static void
handle_pragma_implementation (cpp_reader* dfile ATTRIBUTE_UNUSED )
{
  tree fname = parse_strconst_pragma ("implementation", 1);
  const char *filename;
  struct impl_files *ifiles = impl_file_chain;

  if (fname == error_mark_node)
    return;

  if (fname == 0)
    {
      if (main_input_filename)
	filename = main_input_filename;
      else
	filename = input_filename;
      filename = lbasename (filename);
    }
  else
    {
      filename = TREE_STRING_POINTER (fname);
      if (cpp_included_before (parse_in, filename, input_location))
	warning (0, "#pragma implementation for %qs appears after "
		 "file is included", filename);
    }

  for (; ifiles; ifiles = ifiles->next)
    {
      if (! strcmp (ifiles->filename, filename))
	break;
    }
  if (ifiles == 0)
    {
      ifiles = XNEW (struct impl_files);
      ifiles->filename = xstrdup (filename);
      ifiles->next = impl_file_chain;
      impl_file_chain = ifiles;
    }
}

/* Indicate that this file uses Java-personality exception handling.  */
static void
handle_pragma_java_exceptions (cpp_reader* dfile ATTRIBUTE_UNUSED)
{
  tree x;
  if (pragma_lex (&x) != CPP_EOF)
    warning (0, "junk at end of #pragma GCC java_exceptions");

  choose_personality_routine (lang_java);
  pragma_java_exceptions = true;
}

/* Issue an error message indicating that the lookup of NAME (an
   IDENTIFIER_NODE) failed.  Returns the ERROR_MARK_NODE.  */

tree
unqualified_name_lookup_error (tree name)
{
  if (IDENTIFIER_OPNAME_P (name))
    {
      if (name != ansi_opname (ERROR_MARK))
	error ("%qD not defined", name);
    }
  else
    {
      error ("%qD was not declared in this scope", name);
      /* Prevent repeated error messages by creating a VAR_DECL with
	 this NAME in the innermost block scope.  */
      if (current_function_decl)
	{
	  tree decl;
	  decl = build_decl (input_location,
			     VAR_DECL, name, error_mark_node);
	  DECL_CONTEXT (decl) = current_function_decl;
	  push_local_binding (name, decl, 0);
	  /* Mark the variable as used so that we do not get warnings
	     about it being unused later.  */
	  TREE_USED (decl) = 1;
	}
    }

  return error_mark_node;
}

/* Like unqualified_name_lookup_error, but NAME is an unqualified-id
   used as a function.  Returns an appropriate expression for
   NAME.  */

tree
unqualified_fn_lookup_error (tree name)
{
  if (processing_template_decl)
    {
      /* In a template, it is invalid to write "f()" or "f(3)" if no
	 declaration of "f" is available.  Historically, G++ and most
	 other compilers accepted that usage since they deferred all name
	 lookup until instantiation time rather than doing unqualified
	 name lookup at template definition time; explain to the user what
	 is going wrong.

	 Note that we have the exact wording of the following message in
	 the manual (trouble.texi, node "Name lookup"), so they need to
	 be kept in synch.  */
      permerror (input_location, "there are no arguments to %qD that depend on a template "
		 "parameter, so a declaration of %qD must be available",
		 name, name);

      if (!flag_permissive)
	{
	  static bool hint;
	  if (!hint)
	    {
	      inform (input_location, "(if you use %<-fpermissive%>, G++ will accept your "
		     "code, but allowing the use of an undeclared name is "
		     "deprecated)");
	      hint = true;
	    }
	}
      return name;
    }

  return unqualified_name_lookup_error (name);
}

tree
build_lang_decl (enum tree_code code, tree name, tree type)
{
  tree t;

  t = build_decl (input_location,
		  code, name, type);
  retrofit_lang_decl (t);

  /* All nesting of C++ functions is lexical; there is never a "static
     chain" in the sense of GNU C nested functions.  */
  if (code == FUNCTION_DECL)
    DECL_NO_STATIC_CHAIN (t) = 1;

  return t;
}

/* Add DECL_LANG_SPECIFIC info to T.  Called from build_lang_decl
   and pushdecl (for functions generated by the back end).  */

void
retrofit_lang_decl (tree t)
{
  struct lang_decl *ld;
  size_t size;
  int sel;

  if (TREE_CODE (t) == FUNCTION_DECL)
    sel = 1, size = sizeof (struct lang_decl_fn);
  else if (TREE_CODE (t) == NAMESPACE_DECL)
    sel = 2, size = sizeof (struct lang_decl_ns);
  else if (TREE_CODE (t) == PARM_DECL)
    sel = 3, size = sizeof (struct lang_decl_parm);
  else if (LANG_DECL_HAS_MIN (t))
    sel = 0, size = sizeof (struct lang_decl_min);
  else
    gcc_unreachable ();

  ld = GGC_CNEWVAR (struct lang_decl, size);

  ld->u.base.selector = sel;

  DECL_LANG_SPECIFIC (t) = ld;
  if (current_lang_name == lang_name_cplusplus
      || decl_linkage (t) == lk_none)
    SET_DECL_LANGUAGE (t, lang_cplusplus);
  else if (current_lang_name == lang_name_c)
    SET_DECL_LANGUAGE (t, lang_c);
  else if (current_lang_name == lang_name_java)
    SET_DECL_LANGUAGE (t, lang_java);
  else
    gcc_unreachable ();

#ifdef GATHER_STATISTICS
  tree_node_counts[(int)lang_decl] += 1;
  tree_node_sizes[(int)lang_decl] += size;
#endif
}

void
cxx_dup_lang_specific_decl (tree node)
{
  int size;
  struct lang_decl *ld;

  if (! DECL_LANG_SPECIFIC (node))
    return;

  if (TREE_CODE (node) == FUNCTION_DECL)
    size = sizeof (struct lang_decl_fn);
  else if (TREE_CODE (node) == NAMESPACE_DECL)
    size = sizeof (struct lang_decl_ns);
  else if (TREE_CODE (node) == PARM_DECL)
    size = sizeof (struct lang_decl_parm);
  else if (LANG_DECL_HAS_MIN (node))
    size = sizeof (struct lang_decl_min);
  else
    gcc_unreachable ();

  ld = GGC_NEWVAR (struct lang_decl, size);
  memcpy (ld, DECL_LANG_SPECIFIC (node), size);
  DECL_LANG_SPECIFIC (node) = ld;

#ifdef GATHER_STATISTICS
  tree_node_counts[(int)lang_decl] += 1;
  tree_node_sizes[(int)lang_decl] += size;
#endif
}

/* Copy DECL, including any language-specific parts.  */

tree
copy_decl (tree decl)
{
  tree copy;

  copy = copy_node (decl);
  cxx_dup_lang_specific_decl (copy);
  return copy;
}

/* Replace the shared language-specific parts of NODE with a new copy.  */

static void
copy_lang_type (tree node)
{
  int size;
  struct lang_type *lt;

  if (! TYPE_LANG_SPECIFIC (node))
    return;

  if (TYPE_LANG_SPECIFIC (node)->u.h.is_lang_type_class)
    size = sizeof (struct lang_type);
  else
    size = sizeof (struct lang_type_ptrmem);
  lt = GGC_NEWVAR (struct lang_type, size);
  memcpy (lt, TYPE_LANG_SPECIFIC (node), size);
  TYPE_LANG_SPECIFIC (node) = lt;

#ifdef GATHER_STATISTICS
  tree_node_counts[(int)lang_type] += 1;
  tree_node_sizes[(int)lang_type] += size;
#endif
}

/* Copy TYPE, including any language-specific parts.  */

tree
copy_type (tree type)
{
  tree copy;

  copy = copy_node (type);
  copy_lang_type (copy);
  return copy;
}

tree
cxx_make_type (enum tree_code code)
{
  tree t = make_node (code);

  /* Create lang_type structure.  */
  if (RECORD_OR_UNION_CODE_P (code)
      || code == BOUND_TEMPLATE_TEMPLATE_PARM)
    {
      struct lang_type *pi = GGC_CNEW (struct lang_type);

      TYPE_LANG_SPECIFIC (t) = pi;
      pi->u.c.h.is_lang_type_class = 1;

#ifdef GATHER_STATISTICS
      tree_node_counts[(int)lang_type] += 1;
      tree_node_sizes[(int)lang_type] += sizeof (struct lang_type);
#endif
    }

  /* Set up some flags that give proper default behavior.  */
  if (RECORD_OR_UNION_CODE_P (code))
    {
      struct c_fileinfo *finfo = get_fileinfo (input_filename);
      SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t, finfo->interface_unknown);
      CLASSTYPE_INTERFACE_ONLY (t) = finfo->interface_only;
    }

  return t;
}

tree
make_class_type (enum tree_code code)
{
  tree t = cxx_make_type (code);
  SET_CLASS_TYPE_P (t, 1);
  return t;
}

/* Returns true if we are currently in the main source file, or in a
   template instantiation started from the main source file.  */

bool
in_main_input_context (void)
{
  struct tinst_level *tl = outermost_tinst_level();

  if (tl)
    return strcmp (main_input_filename,
                  LOCATION_FILE (tl->locus)) == 0;
  else
    return strcmp (main_input_filename, input_filename) == 0;
}