1 /* cond.c - conditional assembly pseudo-ops, and .include
2 Copyright 1990, 1991, 1992, 1993, 1995, 1997, 1998, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 /* This is allocated to grow and shrink as .ifdef/.endif pairs are
29 struct obstack cond_obstack
;
36 /* We push one of these structures for each .if, and pop it at the
39 struct conditional_frame
{
40 /* The source file & line number of the "if". */
41 struct file_line if_file_line
;
42 /* The source file & line of the "else". */
43 struct file_line else_file_line
;
44 /* The previous conditional. */
45 struct conditional_frame
*previous_cframe
;
46 /* Have we seen an else yet? */
48 /* Whether we are currently ignoring input. */
50 /* Whether a conditional at a higher level is ignoring input.
51 Set also when a branch of an "if .. elseif .." tree has matched
52 to prevent further matches. */
54 /* Macro nesting level at which this conditional was created. */
58 static void initialize_cframe (struct conditional_frame
*cframe
);
59 static char *get_mri_string (int, int *);
61 static struct conditional_frame
*current_cframe
= NULL
;
63 /* Performs the .ifdef (test_defined == 1) and
64 the .ifndef (test_defined == 0) pseudo op. */
67 s_ifdef (int test_defined
)
69 /* Points to name of symbol. */
71 /* Points to symbol. */
73 struct conditional_frame cframe
;
76 /* Leading whitespace is part of operand. */
78 name
= input_line_pointer
;
80 if (!is_name_beginner (*name
))
82 as_bad (_("invalid identifier for \".ifdef\""));
83 obstack_1grow (&cond_obstack
, 0);
84 ignore_rest_of_line ();
88 c
= get_symbol_end ();
89 symbolP
= symbol_find (name
);
90 *input_line_pointer
= c
;
92 initialize_cframe (&cframe
);
100 /* Use the same definition of 'defined' as .equiv so that a symbol
101 which has been referenced but not yet given a value/address is
102 considered to be undefined. */
105 && S_IS_DEFINED (symbolP
)
106 && S_GET_SEGMENT (symbolP
) != reg_section
;
108 cframe
.ignoring
= ! (test_defined
^ is_defined
);
111 current_cframe
= ((struct conditional_frame
*)
112 obstack_copy (&cond_obstack
, &cframe
,
115 if (LISTING_SKIP_COND ()
117 && (cframe
.previous_cframe
== NULL
118 || ! cframe
.previous_cframe
->ignoring
))
121 demand_empty_rest_of_line ();
128 struct conditional_frame cframe
;
134 stop
= mri_comment_field (&stopc
);
136 /* Leading whitespace is part of operand. */
139 if (current_cframe
!= NULL
&& current_cframe
->ignoring
)
141 operand
.X_add_number
= 0;
142 while (! is_end_of_line
[(unsigned char) *input_line_pointer
])
143 ++input_line_pointer
;
147 expression (&operand
);
148 if (operand
.X_op
!= O_constant
)
149 as_bad (_("non-constant expression in \".if\" statement"));
152 switch ((operatorT
) arg
)
154 case O_eq
: t
= operand
.X_add_number
== 0; break;
155 case O_ne
: t
= operand
.X_add_number
!= 0; break;
156 case O_lt
: t
= operand
.X_add_number
< 0; break;
157 case O_le
: t
= operand
.X_add_number
<= 0; break;
158 case O_ge
: t
= operand
.X_add_number
>= 0; break;
159 case O_gt
: t
= operand
.X_add_number
> 0; break;
165 /* If the above error is signaled, this will dispatch
166 using an undefined result. No big deal. */
167 initialize_cframe (&cframe
);
168 cframe
.ignoring
= cframe
.dead_tree
|| ! t
;
169 current_cframe
= ((struct conditional_frame
*)
170 obstack_copy (&cond_obstack
, &cframe
, sizeof (cframe
)));
172 if (LISTING_SKIP_COND ()
174 && (cframe
.previous_cframe
== NULL
175 || ! cframe
.previous_cframe
->ignoring
))
179 mri_comment_end (stop
, stopc
);
181 demand_empty_rest_of_line ();
184 /* Get a string for the MRI IFC or IFNC pseudo-ops. */
187 get_mri_string (int terminator
, int *len
)
193 s
= ret
= input_line_pointer
;
194 if (*input_line_pointer
== '\'')
197 ++input_line_pointer
;
198 while (! is_end_of_line
[(unsigned char) *input_line_pointer
])
200 *s
++ = *input_line_pointer
++;
203 if (*input_line_pointer
!= '\'')
205 ++input_line_pointer
;
212 while (*input_line_pointer
!= terminator
213 && ! is_end_of_line
[(unsigned char) *input_line_pointer
])
214 ++input_line_pointer
;
215 s
= input_line_pointer
;
216 while (s
> ret
&& (s
[-1] == ' ' || s
[-1] == '\t'))
224 /* The MRI IFC and IFNC pseudo-ops. */
234 struct conditional_frame cframe
;
237 stop
= mri_comment_field (&stopc
);
239 s1
= get_mri_string (',', &len1
);
241 if (*input_line_pointer
!= ',')
242 as_bad (_("bad format for ifc or ifnc"));
244 ++input_line_pointer
;
246 s2
= get_mri_string (';', &len2
);
248 res
= len1
== len2
&& strncmp (s1
, s2
, len1
) == 0;
250 initialize_cframe (&cframe
);
251 cframe
.ignoring
= cframe
.dead_tree
|| ! (res
^ arg
);
252 current_cframe
= ((struct conditional_frame
*)
253 obstack_copy (&cond_obstack
, &cframe
, sizeof (cframe
)));
255 if (LISTING_SKIP_COND ()
257 && (cframe
.previous_cframe
== NULL
258 || ! cframe
.previous_cframe
->ignoring
))
262 mri_comment_end (stop
, stopc
);
264 demand_empty_rest_of_line ();
270 if (current_cframe
== NULL
)
272 as_bad (_("\".elseif\" without matching \".if\""));
274 else if (current_cframe
->else_seen
)
276 as_bad (_("\".elseif\" after \".else\""));
277 as_bad_where (current_cframe
->else_file_line
.file
,
278 current_cframe
->else_file_line
.line
,
279 _("here is the previous \"else\""));
280 as_bad_where (current_cframe
->if_file_line
.file
,
281 current_cframe
->if_file_line
.line
,
282 _("here is the previous \"if\""));
286 as_where (¤t_cframe
->else_file_line
.file
,
287 ¤t_cframe
->else_file_line
.line
);
289 current_cframe
->dead_tree
|= !current_cframe
->ignoring
;
290 current_cframe
->ignoring
= current_cframe
->dead_tree
;
293 if (current_cframe
== NULL
|| current_cframe
->ignoring
)
295 while (! is_end_of_line
[(unsigned char) *input_line_pointer
])
296 ++input_line_pointer
;
298 if (current_cframe
== NULL
)
306 /* Leading whitespace is part of operand. */
309 expression (&operand
);
310 if (operand
.X_op
!= O_constant
)
311 as_bad (_("non-constant expression in \".elseif\" statement"));
313 switch ((operatorT
) arg
)
315 case O_eq
: t
= operand
.X_add_number
== 0; break;
316 case O_ne
: t
= operand
.X_add_number
!= 0; break;
317 case O_lt
: t
= operand
.X_add_number
< 0; break;
318 case O_le
: t
= operand
.X_add_number
<= 0; break;
319 case O_ge
: t
= operand
.X_add_number
>= 0; break;
320 case O_gt
: t
= operand
.X_add_number
> 0; break;
326 current_cframe
->ignoring
= current_cframe
->dead_tree
|| ! t
;
329 if (LISTING_SKIP_COND ()
330 && (current_cframe
->previous_cframe
== NULL
331 || ! current_cframe
->previous_cframe
->ignoring
))
333 if (! current_cframe
->ignoring
)
339 demand_empty_rest_of_line ();
343 s_endif (int arg ATTRIBUTE_UNUSED
)
345 struct conditional_frame
*hold
;
347 if (current_cframe
== NULL
)
349 as_bad (_("\".endif\" without \".if\""));
353 if (LISTING_SKIP_COND ()
354 && current_cframe
->ignoring
355 && (current_cframe
->previous_cframe
== NULL
356 || ! current_cframe
->previous_cframe
->ignoring
))
359 hold
= current_cframe
;
360 current_cframe
= current_cframe
->previous_cframe
;
361 obstack_free (&cond_obstack
, hold
);
362 } /* if one pop too many */
366 while (! is_end_of_line
[(unsigned char) *input_line_pointer
])
367 ++input_line_pointer
;
370 demand_empty_rest_of_line ();
374 s_else (int arg ATTRIBUTE_UNUSED
)
376 if (current_cframe
== NULL
)
378 as_bad (_("\".else\" without matching \".if\""));
380 else if (current_cframe
->else_seen
)
382 as_bad (_("duplicate \"else\""));
383 as_bad_where (current_cframe
->else_file_line
.file
,
384 current_cframe
->else_file_line
.line
,
385 _("here is the previous \"else\""));
386 as_bad_where (current_cframe
->if_file_line
.file
,
387 current_cframe
->if_file_line
.line
,
388 _("here is the previous \"if\""));
392 as_where (¤t_cframe
->else_file_line
.file
,
393 ¤t_cframe
->else_file_line
.line
);
395 current_cframe
->ignoring
=
396 current_cframe
->dead_tree
| !current_cframe
->ignoring
;
398 if (LISTING_SKIP_COND ()
399 && (current_cframe
->previous_cframe
== NULL
400 || ! current_cframe
->previous_cframe
->ignoring
))
402 if (! current_cframe
->ignoring
)
408 current_cframe
->else_seen
= 1;
413 while (! is_end_of_line
[(unsigned char) *input_line_pointer
])
414 ++input_line_pointer
;
417 demand_empty_rest_of_line ();
426 struct conditional_frame cframe
;
428 s1
= demand_copy_C_string (&len1
);
431 if (*input_line_pointer
!= ',')
433 as_bad (_(".ifeqs syntax error"));
434 ignore_rest_of_line ();
438 ++input_line_pointer
;
440 s2
= demand_copy_C_string (&len2
);
442 res
= len1
== len2
&& strncmp (s1
, s2
, len1
) == 0;
444 initialize_cframe (&cframe
);
445 cframe
.ignoring
= cframe
.dead_tree
|| ! (res
^ arg
);
446 current_cframe
= ((struct conditional_frame
*)
447 obstack_copy (&cond_obstack
, &cframe
, sizeof (cframe
)));
449 if (LISTING_SKIP_COND ()
451 && (cframe
.previous_cframe
== NULL
452 || ! cframe
.previous_cframe
->ignoring
))
455 demand_empty_rest_of_line ();
463 s
= input_line_pointer
;
465 if (NO_PSEUDO_DOT
|| flag_m68k_mri
)
473 return (current_cframe
!= NULL
) && (current_cframe
->ignoring
);
476 /* We cannot ignore certain pseudo ops. */
479 && (!strncasecmp (s
, "if", 2)
480 || !strncasecmp (s
, "ifdef", 5)
481 || !strncasecmp (s
, "ifndef", 6)))
484 && (!strncasecmp (s
, "else", 4)
485 || !strncasecmp (s
, "endif", 5)
486 || !strncasecmp (s
, "endc", 4))))
489 return (current_cframe
!= NULL
) && (current_cframe
->ignoring
);
493 initialize_cframe (struct conditional_frame
*cframe
)
495 memset (cframe
, 0, sizeof (*cframe
));
496 as_where (&cframe
->if_file_line
.file
,
497 &cframe
->if_file_line
.line
);
498 cframe
->previous_cframe
= current_cframe
;
499 cframe
->dead_tree
= current_cframe
!= NULL
&& current_cframe
->ignoring
;
500 cframe
->macro_nest
= macro_nest
;
503 /* Give an error if a conditional is unterminated inside a macro or
504 the assembly as a whole. If NEST is non negative, we are being
505 called because of the end of a macro expansion. If NEST is
506 negative, we are being called at the of the input files. */
509 cond_finish_check (int nest
)
511 if (current_cframe
!= NULL
&& current_cframe
->macro_nest
>= nest
)
514 as_bad (_("end of macro inside conditional"));
516 as_bad (_("end of file inside conditional"));
517 as_bad_where (current_cframe
->if_file_line
.file
,
518 current_cframe
->if_file_line
.line
,
519 _("here is the start of the unterminated conditional"));
520 if (current_cframe
->else_seen
)
521 as_bad_where (current_cframe
->else_file_line
.file
,
522 current_cframe
->else_file_line
.line
,
523 _("here is the \"else\" of the unterminated conditional"));
527 /* This function is called when we exit out of a macro. We assume
528 that any conditionals which began within the macro are correctly
529 nested, and just pop them off the stack. */
532 cond_exit_macro (int nest
)
534 while (current_cframe
!= NULL
&& current_cframe
->macro_nest
>= nest
)
536 struct conditional_frame
*hold
;
538 hold
= current_cframe
;
539 current_cframe
= current_cframe
->previous_cframe
;
540 obstack_free (&cond_obstack
, hold
);
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