1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991, 1993 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
22 change this a bit. But then, GNU isn't
23 spozed to run on your machine anyway.
24 (RMS is so shortsighted sometimes.)
27 #define MASK_CHAR ((int)(unsigned char)-1)
31 /* This is the largest known floating point format (for now). It will
32 grow when we do 4361 style flonums. */
34 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
36 /* Routines that read assembler source text to build spagetti in memory.
37 Another group of these functions is in the expr.c module. */
51 #ifndef TC_START_LABEL
52 #define TC_START_LABEL(x,y) (x==':')
55 /* The NOP_OPCODE is for the alignment fill value.
56 * fill it a nop instruction so that the disassembler does not choke
60 #define NOP_OPCODE 0x00
63 char *input_line_pointer
; /*->next char of source file to parse. */
65 #if BITS_PER_CHAR != 8
66 /* The following table is indexed by[(char)] and will break if
67 a char does not have exactly 256 states (hopefully 0:255!)! */
72 /* The m88k unfortunately uses @ as a label beginner. */
76 /* used by is_... macros. our ctype[] */
77 const char lex_type
[256] =
79 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
80 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
81 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
82 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
83 LEX_AT
, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
84 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
85 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
86 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
91 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99 * Out: 1 if this character ends a line.
102 char is_end_of_line
[256] =
105 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, 99, _
, _
, 99, _
, _
, /* @abcdefghijklmno */
107 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, 99, _
, _
, _
, _
, _
, /* @abcdefghijklmno */
109 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
111 _
,99, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* _!"#$%&'()*+,-./ */
112 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* 0123456789:;<=>? */
114 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
115 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, 99, _
, _
, _
, _
, /* 0123456789:;<=>? */
117 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
118 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
119 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
120 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
121 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
122 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
123 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
124 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
125 _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, _
, /* */
129 /* Functions private to this file. */
131 static char *buffer
; /* 1st char of each buffer of lines is here. */
132 static char *buffer_limit
; /*->1 + last char in buffer. */
134 static char *bignum_low
; /* Lowest char of bignum. */
135 static char *bignum_limit
; /* 1st illegal address of bignum. */
136 static char *bignum_high
; /* Highest char of bignum. */
137 /* May point to (bignum_start-1). */
138 /* Never >= bignum_limit. */
140 int target_big_endian
;
142 static char *old_buffer
; /* JF a hack */
143 static char *old_input
;
144 static char *old_limit
;
146 /* Variables for handling include file directory list. */
148 char **include_dirs
; /* List of pointers to directories to
149 search for .include's */
150 int include_dir_count
; /* How many are in the list */
151 int include_dir_maxlen
= 1;/* Length of longest in list */
153 #ifndef WORKING_DOT_WORD
154 struct broken_word
*broken_words
;
155 int new_broken_words
;
158 static char *demand_copy_string
PARAMS ((int *lenP
));
159 int is_it_end_of_statement
PARAMS ((void));
160 unsigned int next_char_of_string
PARAMS ((void));
161 static segT get_segmented_expression
PARAMS ((expressionS
*expP
));
162 static segT get_known_segmented_expression
PARAMS ((expressionS
* expP
));
163 static void grow_bignum
PARAMS ((void));
164 static void pobegin
PARAMS ((void));
175 obj_read_begin_hook ();
177 /* Something close -- but not too close -- to a multiple of 1024.
178 The debugging malloc I'm using has 24 bytes of overhead. */
179 obstack_begin (¬es
, 5090);
180 obstack_begin (&cond_obstack
, 990);
182 #define BIGNUM_BEGIN_SIZE (16)
183 bignum_low
= xmalloc ((long) BIGNUM_BEGIN_SIZE
);
184 bignum_limit
= bignum_low
+ BIGNUM_BEGIN_SIZE
;
186 /* Use machine dependent syntax */
187 for (p
= line_separator_chars
; *p
; p
++)
188 is_end_of_line
[*p
] = 1;
189 /* Use more. FIXME-SOMEDAY. */
192 /* set up pseudo-op tables */
194 struct hash_control
*po_hash
;
196 static const pseudo_typeS potable
[] =
198 {"abort", s_abort
, 0},
199 {"align", s_align_ptwo
, 0},
200 {"ascii", stringer
, 0},
201 {"asciz", stringer
, 1},
207 {"double", float_cons
, 'd'},
209 {"eject", listing_eject
, 0}, /* Formfeed listing */
212 {"endif", s_endif
, 0},
217 {"extern", s_ignore
, 0}, /* We treat all undef as ext */
218 {"appfile", s_app_file
, 1},
219 {"appline", s_app_line
, 0},
220 {"file", s_app_file
, 0},
222 {"float", float_cons
, 'f'},
223 {"global", s_globl
, 0},
224 {"globl", s_globl
, 0},
227 {"ifdef", s_ifdef
, 0},
228 {"ifeqs", s_ifeqs
, 0},
229 {"ifndef", s_ifdef
, 1},
230 {"ifnes", s_ifeqs
, 1},
231 {"ifnotdef", s_ifdef
, 1},
232 {"include", s_include
, 0},
234 {"lcomm", s_lcomm
, 0},
235 {"lflags", listing_flags
, 0}, /* Listing flags */
236 {"list", listing_list
, 1}, /* Turn listing on */
239 {"nolist", listing_list
, 0}, /* Turn listing off */
240 {"octa", big_cons
, 16},
242 {"psize", listing_psize
, 0}, /* set paper size */
244 {"quad", big_cons
, 8},
245 {"sbttl", listing_title
, 1}, /* Subtitle of listing */
250 {"single", float_cons
, 'f'},
252 {"space", s_space
, 0},
255 {"title", listing_title
, 0}, /* Listing title */
260 {NULL
} /* end sentinel */
266 char *errtxt
; /* error text */
267 const pseudo_typeS
*pop
;
269 po_hash
= hash_new ();
271 /* Do the target-specific pseudo ops. */
272 for (pop
= md_pseudo_table
; pop
->poc_name
; pop
++)
274 errtxt
= hash_insert (po_hash
, pop
->poc_name
, (char *) pop
);
275 if (errtxt
&& *errtxt
)
277 as_fatal ("error constructing md pseudo-op table");
281 /* Now object specific. Skip any that were in the target table. */
282 for (pop
= obj_pseudo_table
; pop
->poc_name
; pop
++)
284 errtxt
= hash_insert (po_hash
, pop
->poc_name
, (char *) pop
);
285 if (errtxt
&& *errtxt
)
287 if (!strcmp (errtxt
, "exists"))
289 #ifdef DIE_ON_OVERRIDES
290 as_fatal ("pseudo op \".%s\" overridden.\n", pop
->poc_name
);
291 #endif /* DIE_ON_OVERRIDES */
292 continue; /* OK if target table overrides. */
296 as_fatal ("error constructing obj pseudo-op table");
297 } /* if overridden */
301 /* Now portable ones. Skip any that we've seen already. */
302 for (pop
= potable
; pop
->poc_name
; pop
++)
304 errtxt
= hash_insert (po_hash
, pop
->poc_name
, (char *) pop
);
305 if (errtxt
&& *errtxt
)
307 if (!strcmp (errtxt
, "exists"))
309 #ifdef DIE_ON_OVERRIDES
310 as_fatal ("pseudo op \".%s\" overridden.\n", pop
->poc_name
);
311 #endif /* DIE_ON_OVERRIDES */
312 continue; /* OK if target table overrides. */
316 as_fatal ("error constructing obj pseudo-op table");
317 } /* if overridden */
324 #define HANDLE_CONDITIONAL_ASSEMBLY() \
325 if (ignore_input ()) \
327 while (! is_end_of_line[*input_line_pointer++]) \
328 if (input_line_pointer == buffer_limit) \
334 /* read_a_source_file()
336 * We read the file, putting things into a web that
337 * represents what we have been reading.
340 read_a_source_file (name
)
344 register char *s
; /* string of symbol, '\0' appended */
348 buffer
= input_scrub_new_file (name
);
351 listing_newline ("");
353 while ((buffer_limit
= input_scrub_next_buffer (&input_line_pointer
)) != 0)
354 { /* We have another line to parse. */
355 know (buffer_limit
[-1] == '\n'); /* Must have a sentinel. */
356 contin
: /* JF this goto is my fault I admit it.
357 Someone brave please re-write the whole
358 input section here? Pleeze??? */
359 while (input_line_pointer
< buffer_limit
)
361 /* We have more of this buffer to parse. */
364 * We now have input_line_pointer->1st char of next line.
365 * If input_line_pointer [-1] == '\n' then we just
366 * scanned another line: so bump line counters.
368 if (input_line_pointer
[-1] == '\n')
370 bump_line_counters ();
373 /* Text at the start of a line must be a label, we run down and stick a colon in */
374 if (is_name_beginner (*input_line_pointer
))
376 char *line_start
= input_line_pointer
;
377 char c
= get_symbol_end ();
379 *input_line_pointer
= c
;
381 input_line_pointer
++;
389 * We are at the begining of a line, or similar place.
390 * We expect a well-formed assembler statement.
391 * A "symbol-name:" is a statement.
393 * Depending on what compiler is used, the order of these tests
394 * may vary to catch most common case 1st.
395 * Each test is independent of all other tests at the (top) level.
396 * PLEASE make a compiler that doesn't use this assembler.
397 * It is crufty to waste a compiler's time encoding things for this
398 * assembler, which then wastes more time decoding it.
399 * (And communicating via (linear) files is silly!
400 * If you must pass stuff, please pass a tree!)
402 if ((c
= *input_line_pointer
++) == '\t'
407 c
= *input_line_pointer
++;
409 know (c
!= ' '); /* No further leading whitespace. */
412 * C is the 1st significant character.
413 * Input_line_pointer points after that character.
415 if (is_name_beginner (c
))
416 { /* want user-defined label or pseudo/opcode */
417 HANDLE_CONDITIONAL_ASSEMBLY ();
419 s
= --input_line_pointer
;
420 c
= get_symbol_end (); /* name's delimiter */
422 * C is character after symbol.
423 * That character's place in the input line is now '\0'.
424 * S points to the beginning of the symbol.
425 * [In case of pseudo-op, s->'.'.]
426 * Input_line_pointer->'\0' where c was.
428 if (TC_START_LABEL(c
, input_line_pointer
))
430 colon (s
); /* user-defined label */
431 *input_line_pointer
++ = ':'; /* Put ':' back for error messages' sake. */
432 /* Input_line_pointer->after ':'. */
437 else if (c
== '=' || input_line_pointer
[1] == '=')
440 demand_empty_rest_of_line ();
443 { /* expect pseudo-op or machine instruction */
445 if (!done_pseudo (s
))
452 /* The m88k uses pseudo-ops without a period. */
453 pop
= (pseudo_typeS
*) hash_find (po_hash
, s
);
454 if (pop
!= NULL
&& pop
->poc_handler
== NULL
)
458 if (pop
!= NULL
|| *s
== '.')
463 * WARNING: c has next char, which may be end-of-line.
464 * We lookup the pseudo-op table with s+1 because we
465 * already know that the pseudo-op begins with a '.'.
469 pop
= (pseudo_typeS
*) hash_find (po_hash
, s
+ 1);
471 /* Print the error msg now, while we still can */
474 as_bad ("Unknown pseudo-op: `%s'", s
);
475 *input_line_pointer
= c
;
480 /* Put it back for error messages etc. */
481 *input_line_pointer
= c
;
482 /* The following skip of whitespace is compulsory.
483 A well shaped space is sometimes all that separates
484 keyword from operands. */
485 if (c
== ' ' || c
== '\t')
487 input_line_pointer
++;
488 } /* Skip seperator after keyword. */
490 * Input_line is restored.
491 * Input_line_pointer->1st non-blank char
492 * after pseudo-operation.
496 ignore_rest_of_line ();
501 (*pop
->poc_handler
) (pop
->poc_val
);
502 } /* if we have one */
506 { /* machine instruction */
507 /* WARNING: c has char, which may be end-of-line. */
508 /* Also: input_line_pointer->`\0` where c was. */
509 *input_line_pointer
= c
;
510 while (!is_end_of_line
[*input_line_pointer
])
512 input_line_pointer
++;
515 c
= *input_line_pointer
;
516 *input_line_pointer
= '\0';
518 md_assemble (s
); /* Assemble 1 instruction. */
520 *input_line_pointer
++ = c
;
522 /* We resume loop AFTER the end-of-line from this instruction */
527 } /* if (is_name_beginner(c) */
530 if (is_end_of_line
[c
])
533 } /* empty statement */
536 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
538 { /* local label ("4:") */
539 char *backup
= input_line_pointer
;
541 HANDLE_CONDITIONAL_ASSEMBLY ();
545 while (isdigit (*input_line_pointer
))
547 temp
= (temp
* 10) + *input_line_pointer
- '0';
548 ++input_line_pointer
;
549 } /* read the whole number */
551 #ifdef LOCAL_LABELS_DOLLAR
552 if (*input_line_pointer
== '$'
553 && *(input_line_pointer
+ 1) == ':')
555 input_line_pointer
+= 2;
557 if (dollar_label_defined (temp
))
559 as_fatal ("label \"%d$\" redefined", temp
);
562 define_dollar_label (temp
);
563 colon (dollar_label_name (temp
, 0));
566 #endif /* LOCAL_LABELS_DOLLAR */
568 #ifdef LOCAL_LABELS_FB
569 if (*input_line_pointer
++ == ':')
571 fb_label_instance_inc (temp
);
572 colon (fb_label_name (temp
, 0));
575 #endif /* LOCAL_LABELS_FB */
577 input_line_pointer
= backup
;
578 } /* local label ("4:") */
579 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
581 if (c
&& strchr (line_comment_chars
, c
))
582 { /* Its a comment. Better say APP or NO_APP */
588 extern char *scrub_string
, *scrub_last_string
;
590 bump_line_counters ();
591 s
= input_line_pointer
;
592 if (strncmp (s
, "APP\n", 4))
593 continue; /* We ignore it */
596 ends
= strstr (s
, "#NO_APP\n");
603 /* The end of the #APP wasn't in this buffer. We
604 keep reading in buffers until we find the #NO_APP
605 that goes with this #APP There is one. The specs
607 tmp_len
= buffer_limit
- s
;
608 tmp_buf
= xmalloc (tmp_len
+ 1);
609 memcpy (tmp_buf
, s
, tmp_len
);
612 new_tmp
= input_scrub_next_buffer (&buffer
);
616 buffer_limit
= new_tmp
;
617 input_line_pointer
= buffer
;
618 ends
= strstr (buffer
, "#NO_APP\n");
622 num
= buffer_limit
- buffer
;
624 tmp_buf
= xrealloc (tmp_buf
, tmp_len
+ num
);
625 memcpy (tmp_buf
, buffer
+ tmp_len
, num
);
630 input_line_pointer
= ends
? ends
+ 8 : NULL
;
638 input_line_pointer
= ends
+ 8;
640 new_buf
= xmalloc (100);
645 scrub_last_string
= ends
;
650 ch
= do_scrub_next_char (scrub_from_string
, scrub_to_string
);
654 if (new_tmp
== new_buf
+ new_length
)
656 new_buf
= xrealloc (new_buf
, new_length
+ 100);
657 new_tmp
= new_buf
+ new_length
;
665 old_input
= input_line_pointer
;
666 old_limit
= buffer_limit
;
668 input_line_pointer
= new_buf
;
669 buffer_limit
= new_tmp
;
673 HANDLE_CONDITIONAL_ASSEMBLY ();
675 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
676 input_line_pointer
--; /* Report unknown char as ignored. */
677 ignore_rest_of_line ();
678 } /* while (input_line_pointer<buffer_limit) */
681 bump_line_counters ();
685 input_line_pointer
= old_input
;
686 buffer_limit
= old_limit
;
691 } /* while (more buffers to scan) */
692 input_scrub_close (); /* Close the input file */
694 } /* read_a_source_file() */
699 as_fatal (".abort detected. Abandoning ship.");
702 /* For machines where ".align 4" means align to a 4 byte boundary. */
707 register unsigned int temp
;
708 register long temp_fill
;
710 unsigned long max_alignment
= 1 << 15;
712 if (is_end_of_line
[*input_line_pointer
])
713 temp
= arg
; /* Default value from pseudo-op table */
715 temp
= get_absolute_expression ();
717 if (temp
> max_alignment
)
719 as_bad ("Alignment too large: %d. assumed.", temp
= max_alignment
);
723 * For the sparc, `.align (1<<n)' actually means `.align n'
724 * so we have to convert it.
728 for (i
= 0; (temp
& 1) == 0; temp
>>= 1, ++i
)
732 as_bad ("Alignment not a power of 2");
735 if (*input_line_pointer
== ',')
737 input_line_pointer
++;
738 temp_fill
= get_absolute_expression ();
740 else if (now_seg
!= data_section
&& now_seg
!= bss_section
)
741 temp_fill
= NOP_OPCODE
;
744 /* Only make a frag if we HAVE to. . . */
745 if (temp
&& !need_pass_2
)
746 frag_align (temp
, (int) temp_fill
);
748 record_alignment (now_seg
, temp
);
750 demand_empty_rest_of_line ();
751 } /* s_align_bytes() */
753 /* For machines where ".align 4" means align to 2**4 boundary. */
758 register long temp_fill
;
759 long max_alignment
= 15;
761 temp
= get_absolute_expression ();
762 if (temp
> max_alignment
)
763 as_bad ("Alignment too large: %d. assumed.", temp
= max_alignment
);
766 as_bad ("Alignment negative. 0 assumed.");
769 if (*input_line_pointer
== ',')
771 input_line_pointer
++;
772 temp_fill
= get_absolute_expression ();
774 /* @@ Fix this right for BFD! */
775 else if (now_seg
!= data_section
&& now_seg
!= bss_section
)
776 temp_fill
= NOP_OPCODE
;
779 /* Only make a frag if we HAVE to. . . */
780 if (temp
&& !need_pass_2
)
781 frag_align (temp
, (int) temp_fill
);
783 record_alignment (now_seg
, temp
);
785 demand_empty_rest_of_line ();
786 } /* s_align_ptwo() */
795 register symbolS
*symbolP
;
797 name
= input_line_pointer
;
798 c
= get_symbol_end ();
799 /* just after name is now '\0' */
800 p
= input_line_pointer
;
803 if (*input_line_pointer
!= ',')
805 as_bad ("Expected comma after symbol-name: rest of line ignored.");
806 ignore_rest_of_line ();
809 input_line_pointer
++; /* skip ',' */
810 if ((temp
= get_absolute_expression ()) < 0)
812 as_warn (".COMMon length (%d.) <0! Ignored.", temp
);
813 ignore_rest_of_line ();
817 symbolP
= symbol_find_or_make (name
);
819 if (S_IS_DEFINED (symbolP
))
821 as_bad ("Ignoring attempt to re-define symbol");
822 ignore_rest_of_line ();
825 if (S_GET_VALUE (symbolP
))
827 if (S_GET_VALUE (symbolP
) != temp
)
828 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
829 S_GET_NAME (symbolP
),
830 S_GET_VALUE (symbolP
),
835 S_SET_VALUE (symbolP
, temp
);
836 S_SET_EXTERNAL (symbolP
);
839 if ( (!temp
) || !flagseen
['1'])
840 S_GET_OTHER(symbolP
) = const_flag
;
841 #endif /* not OBJ_VMS */
842 know (symbolP
->sy_frag
== &zero_address_frag
);
843 demand_empty_rest_of_line ();
852 temp
= get_absolute_expression ();
855 section
= text_section
;
859 section
= data_section
;
862 subseg_set (section
, (subsegT
) temp
);
864 subseg_new (section
, (subsegT
) temp
);
870 demand_empty_rest_of_line ();
873 /* Handle the .appfile pseudo-op. This is automatically generated by
874 do_scrub_next_char when a preprocessor # line comment is seen with
875 a file name. This default definition may be overridden by the
876 object or CPU specific pseudo-ops. This function is also the
877 default definition for .file; the APPFILE argument is 1 for
878 .appfile, 0 for .file. */
887 /* Some assemblers tolerate immediately following '"' */
888 if ((s
= demand_copy_string (&length
)) != 0)
890 /* If this is a fake .appfile, a fake newline was inserted into
891 the buffer. Passing -2 to new_logical_line tells it to
893 new_logical_line (s
, appfile
? -2 : -1);
894 demand_empty_rest_of_line ();
897 listing_source_file (s
);
901 c_dot_file_symbol (s
);
902 #endif /* OBJ_COFF */
908 /* Handle the .appline pseudo-op. This is automatically generated by
909 do_scrub_next_char when a preprocessor # line comment is seen.
910 This default definition may be overridden by the object or CPU
911 specific pseudo-ops. */
918 /* The given number is that of the next line. */
919 l
= get_absolute_expression () - 1;
920 new_logical_line ((char *) NULL
, l
);
923 listing_source_line (l
);
925 demand_empty_rest_of_line ();
931 long temp_repeat
= 0;
933 register long temp_fill
= 0;
937 temp_repeat
= get_absolute_expression ();
938 if (*input_line_pointer
== ',')
940 input_line_pointer
++;
941 temp_size
= get_absolute_expression ();
942 if (*input_line_pointer
== ',')
944 input_line_pointer
++;
945 temp_fill
= get_absolute_expression ();
948 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
949 #define BSD_FILL_SIZE_CROCK_8 (8)
950 if (temp_size
> BSD_FILL_SIZE_CROCK_8
)
952 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8
);
953 temp_size
= BSD_FILL_SIZE_CROCK_8
;
957 as_warn ("Size negative: .fill ignored.");
960 else if (temp_repeat
<= 0)
962 as_warn ("Repeat < 0, .fill ignored");
966 if (temp_size
&& !need_pass_2
)
968 p
= frag_var (rs_fill
, (int) temp_size
, (int) temp_size
, (relax_substateT
) 0, (symbolS
*) 0, temp_repeat
, (char *) 0);
969 memset (p
, 0, (int) temp_size
);
970 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
971 * flavoured AS. The following bizzare behaviour is to be
972 * compatible with above. I guess they tried to take up to 8
973 * bytes from a 4-byte expression and they forgot to sign
974 * extend. Un*x Sux. */
975 #define BSD_FILL_SIZE_CROCK_4 (4)
976 md_number_to_chars (p
, temp_fill
,
977 (temp_size
> BSD_FILL_SIZE_CROCK_4
978 ? BSD_FILL_SIZE_CROCK_4
980 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
981 * but emits no error message because it seems a legal thing to do.
982 * It is a degenerate case of .fill but could be emitted by a compiler.
985 demand_empty_rest_of_line ();
997 name
= input_line_pointer
;
998 c
= get_symbol_end ();
999 symbolP
= symbol_find_or_make (name
);
1000 *input_line_pointer
= c
;
1002 S_SET_EXTERNAL (symbolP
);
1005 input_line_pointer
++;
1007 if (*input_line_pointer
== '\n')
1012 demand_empty_rest_of_line ();
1016 s_lcomm (needs_align
)
1017 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1018 (alignment); 0 if it was an ".lcomm" (2 args only) */
1021 register char *name
;
1025 register symbolS
*symbolP
;
1026 segT current_seg
= now_seg
;
1027 subsegT current_subseg
= now_subseg
;
1028 const int max_alignment
= 15;
1030 segT bss_seg
= bss_section
;
1032 name
= input_line_pointer
;
1033 c
= get_symbol_end ();
1034 p
= input_line_pointer
;
1037 if (*input_line_pointer
!= ',')
1039 as_bad ("Expected comma after name");
1040 ignore_rest_of_line ();
1044 ++input_line_pointer
;
1046 if (*input_line_pointer
== '\n')
1048 as_bad ("Missing size expression");
1052 if ((temp
= get_absolute_expression ()) < 0)
1054 as_warn ("BSS length (%d.) <0! Ignored.", temp
);
1055 ignore_rest_of_line ();
1061 /* For MIPS ECOFF, small objects are put in .sbss. */
1062 if (temp
<= bfd_get_gp_size (stdoutput
))
1063 bss_seg
= subseg_new (".sbss", 1);
1071 if (*input_line_pointer
!= ',')
1073 as_bad ("Expected comma after size");
1074 ignore_rest_of_line ();
1077 input_line_pointer
++;
1079 if (*input_line_pointer
== '\n')
1081 as_bad ("Missing alignment");
1084 align
= get_absolute_expression ();
1085 if (align
> max_alignment
)
1087 align
= max_alignment
;
1088 as_warn ("Alignment too large: %d. assumed.", align
);
1093 as_warn ("Alignment negative. 0 assumed.");
1095 record_alignment (bss_seg
, align
);
1096 } /* if needs align */
1099 symbolP
= symbol_find_or_make (name
);
1103 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1104 S_GET_OTHER (symbolP
) == 0 &&
1105 S_GET_DESC (symbolP
) == 0 &&
1106 #endif /* OBJ_AOUT or OBJ_BOUT */
1107 (S_GET_SEGMENT (symbolP
) == bss_seg
1108 || (!S_IS_DEFINED (symbolP
) && S_GET_VALUE (symbolP
) == 0)))
1112 #ifdef BFD_ASSEMBLER
1113 subseg_set (bss_seg
, 1);
1115 subseg_new (bss_seg
, 1);
1119 frag_align (align
, 0);
1120 /* detach from old frag */
1121 if (S_GET_SEGMENT (symbolP
) == bss_seg
)
1122 symbolP
->sy_frag
->fr_symbol
= NULL
;
1124 symbolP
->sy_frag
= frag_now
;
1125 p
= frag_var (rs_org
, 1, 1, (relax_substateT
)0, symbolP
,
1129 S_SET_SEGMENT (symbolP
, bss_seg
);
1132 /* The symbol may already have been created with a preceding
1133 ".globl" directive -- be careful not to step on storage class
1134 in that case. Otherwise, set it to static. */
1135 if (S_GET_STORAGE_CLASS (symbolP
) != C_EXT
)
1137 S_SET_STORAGE_CLASS (symbolP
, C_STAT
);
1139 #endif /* OBJ_COFF */
1143 as_bad ("Ignoring attempt to re-define symbol %s.", name
);
1146 #ifdef BFD_ASSEMBLER
1147 subseg_set (current_seg
, current_subseg
);
1149 subseg_new (current_seg
, current_subseg
);
1152 demand_empty_rest_of_line ();
1170 register char *name
;
1173 register segT segment
;
1175 register symbolS
*symbolP
;
1178 /* we permit ANY defined expression: BSD4.2 demands constants */
1179 name
= input_line_pointer
;
1180 c
= get_symbol_end ();
1181 p
= input_line_pointer
;
1184 if (*input_line_pointer
!= ',')
1187 as_bad ("Expected comma after name \"%s\"", name
);
1189 ignore_rest_of_line ();
1192 input_line_pointer
++;
1193 val
= get_absolute_expression ();
1195 symbolP
= symbol_find_or_make (name
);
1197 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1198 symbolP->sy_desc == 0) out of this test because coff doesn't have
1199 those fields, and I can't see when they'd ever be tripped. I
1200 don't think I understand why they were here so I may have
1201 introduced a bug. As recently as 1.37 didn't have this test
1202 anyway. xoxorich. */
1204 if (S_GET_SEGMENT (symbolP
) == undefined_section
1205 && S_GET_VALUE (symbolP
) == 0)
1207 /* The name might be an undefined .global symbol; be sure to
1208 keep the "external" bit. */
1209 S_SET_SEGMENT (symbolP
, segment
);
1210 S_SET_VALUE (symbolP
, val
);
1214 as_bad ("Symbol %s already defined", name
);
1217 demand_empty_rest_of_line ();
1223 register segT segment
;
1225 register long temp_fill
;
1227 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1228 thing as a sub-segment-relative origin. Any absolute origin is
1229 given a warning, then assumed to be segment-relative. Any
1230 segmented origin expression ("foo+42") had better be in the right
1231 segment or the .org is ignored.
1233 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1234 we never know sub-segment sizes when we are reading code. BSD
1235 will crash trying to emit negative numbers of filler bytes in
1236 certain .orgs. We don't crash, but see as-write for that code.
1238 Don't make frag if need_pass_2==1. */
1239 segment
= get_known_segmented_expression (&exp
);
1240 if (*input_line_pointer
== ',')
1242 input_line_pointer
++;
1243 temp_fill
= get_absolute_expression ();
1249 if (segment
!= now_seg
&& segment
!= absolute_section
)
1250 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1251 segment_name (segment
), segment_name (now_seg
));
1252 p
= frag_var (rs_org
, 1, 1, (relax_substateT
) 0, exp
.X_add_symbol
,
1253 exp
.X_add_number
, (char *) 0);
1255 } /* if (ok to make frag) */
1256 demand_empty_rest_of_line ();
1262 register char *name
;
1263 register char delim
;
1264 register char *end_name
;
1265 register symbolS
*symbolP
;
1268 * Especial apologies for the random logic:
1269 * this just grew, and could be parsed much more simply!
1272 name
= input_line_pointer
;
1273 delim
= get_symbol_end ();
1274 end_name
= input_line_pointer
;
1278 if (*input_line_pointer
!= ',')
1281 as_bad ("Expected comma after name \"%s\"", name
);
1283 ignore_rest_of_line ();
1287 input_line_pointer
++;
1290 if (name
[0] == '.' && name
[1] == '\0')
1292 /* Turn '. = mumble' into a .org mumble */
1293 register segT segment
;
1297 segment
= get_known_segmented_expression (&exp
);
1301 if (segment
!= now_seg
&& segment
!= absolute_section
)
1302 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1303 segment_name (segment
),
1304 segment_name (now_seg
));
1305 ptr
= frag_var (rs_org
, 1, 1, (relax_substateT
) 0, exp
.X_add_symbol
,
1306 exp
.X_add_number
, (char *) 0);
1308 } /* if (ok to make frag) */
1314 if ((symbolP
= symbol_find (name
)) == NULL
1315 && (symbolP
= md_undefined_symbol (name
)) == NULL
)
1317 symbolP
= symbol_new (name
, undefined_section
, 0, &zero_address_frag
);
1319 /* "set" symbols are local unless otherwise specified. */
1320 SF_SET_LOCAL (symbolP
);
1321 #endif /* OBJ_COFF */
1323 } /* make a new symbol */
1325 symbol_table_insert (symbolP
);
1328 pseudo_set (symbolP
);
1329 demand_empty_rest_of_line ();
1337 register long temp_fill
;
1340 /* Just like .fill, but temp_size = 1 */
1341 if (get_absolute_expression_and_terminator (&temp_repeat
) == ',')
1343 temp_fill
= get_absolute_expression ();
1347 input_line_pointer
--; /* Backup over what was not a ','. */
1352 temp_repeat
*= mult
;
1354 if (temp_repeat
<= 0)
1356 as_warn ("Repeat < 0, .space ignored");
1357 ignore_rest_of_line ();
1362 p
= frag_var (rs_fill
, 1, 1, (relax_substateT
) 0, (symbolS
*) 0,
1363 temp_repeat
, (char *) 0);
1366 demand_empty_rest_of_line ();
1374 temp
= get_absolute_expression ();
1375 #ifdef BFD_ASSEMBLER
1376 subseg_set (text_section
, (subsegT
) temp
);
1378 subseg_new (text_section
, (subsegT
) temp
);
1380 demand_empty_rest_of_line ();
1385 demand_empty_rest_of_line ()
1388 if (is_end_of_line
[*input_line_pointer
])
1390 input_line_pointer
++;
1394 ignore_rest_of_line ();
1396 /* Return having already swallowed end-of-line. */
1397 } /* Return pointing just after end-of-line. */
1400 ignore_rest_of_line () /* For suspect lines: gives warning. */
1402 if (!is_end_of_line
[*input_line_pointer
])
1404 if (isprint (*input_line_pointer
))
1405 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1406 *input_line_pointer
);
1408 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1409 *input_line_pointer
);
1410 while (input_line_pointer
< buffer_limit
1411 && !is_end_of_line
[*input_line_pointer
])
1413 input_line_pointer
++;
1416 input_line_pointer
++; /* Return pointing just after end-of-line. */
1417 know (is_end_of_line
[input_line_pointer
[-1]]);
1423 * In: Pointer to a symbol.
1424 * Input_line_pointer->expression.
1426 * Out: Input_line_pointer->just after any whitespace after expression.
1427 * Tried to set symbol to value of expression.
1428 * Will change symbols type, value, and frag;
1431 pseudo_set (symbolP
)
1435 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1437 #endif /* OBJ_AOUT or OBJ_BOUT */
1439 know (symbolP
); /* NULL pointer is logic error. */
1440 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1441 /* @@ Fix this right for BFD. */
1442 ext
= S_IS_EXTERNAL (symbolP
);
1443 #endif /* OBJ_AOUT or OBJ_BOUT */
1445 (void) expression (&exp
);
1447 if (exp
.X_op
== O_illegal
)
1448 as_bad ("illegal expression; zero assumed");
1449 else if (exp
.X_op
== O_absent
)
1450 as_bad ("missing expression; zero assumed");
1451 else if (exp
.X_op
== O_big
)
1452 as_bad ("%s number invalid; zero assumed",
1453 exp
.X_add_number
> 0 ? "bignum" : "floating point");
1454 else if (exp
.X_op
== O_subtract
1455 && (S_GET_SEGMENT (exp
.X_add_symbol
)
1456 == S_GET_SEGMENT (exp
.X_op_symbol
))
1457 && SEG_NORMAL (S_GET_SEGMENT (exp
.X_add_symbol
))
1458 && exp
.X_add_symbol
->sy_frag
== exp
.X_op_symbol
->sy_frag
)
1460 exp
.X_op
= O_constant
;
1461 exp
.X_add_number
= (S_GET_VALUE (exp
.X_add_symbol
)
1462 - S_GET_VALUE (exp
.X_op_symbol
));
1470 exp
.X_add_number
= 0;
1473 S_SET_SEGMENT (symbolP
, absolute_section
);
1474 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1475 /* @@ Fix this right for BFD. */
1477 S_SET_EXTERNAL (symbolP
);
1479 S_CLEAR_EXTERNAL (symbolP
);
1480 #endif /* OBJ_AOUT or OBJ_BOUT */
1481 S_SET_VALUE (symbolP
, exp
.X_add_number
);
1482 symbolP
->sy_frag
= &zero_address_frag
;
1486 S_SET_SEGMENT (symbolP
, reg_section
);
1487 S_SET_VALUE (symbolP
, exp
.X_add_number
);
1488 symbolP
->sy_frag
= &zero_address_frag
;
1492 if (S_GET_SEGMENT (exp
.X_add_symbol
) == undefined_section
)
1493 symbolP
->sy_value
= exp
;
1496 S_SET_SEGMENT (symbolP
, S_GET_SEGMENT (exp
.X_add_symbol
));
1497 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1498 /* @@ Fix this right for BFD! */
1500 S_SET_EXTERNAL (symbolP
);
1502 S_CLEAR_EXTERNAL (symbolP
);
1503 #endif /* OBJ_AOUT or OBJ_BOUT */
1504 S_SET_VALUE (symbolP
,
1505 exp
.X_add_number
+ S_GET_VALUE (exp
.X_add_symbol
));
1506 symbolP
->sy_frag
= exp
.X_add_symbol
->sy_frag
;
1511 /* The value is some complex expression.
1512 FIXME: Should we set the segment to anything? */
1513 symbolP
->sy_value
= exp
;
1521 * CONStruct more frag of .bytes, or .words etc.
1522 * Should need_pass_2 be 1 then emit no frag(s).
1523 * This understands EXPRESSIONS, as opposed to big_cons().
1527 * This has a split personality. We use expression() to read the
1528 * value. We can detect if the value won't fit in a byte or word.
1529 * But we can't detect if expression() discarded significant digits
1530 * in the case of a long. Not worth the crocks required to fix it.
1533 /* Select a parser for cons expressions. */
1535 /* Some targets need to parse the expression in various fancy ways.
1536 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1537 (for example, the HPPA does this). Otherwise, you can define
1538 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1539 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1540 are defined, which is the normal case, then only simple expressions
1543 #ifndef TC_PARSE_CONS_EXPRESSION
1544 #ifdef BITFIELD_CONS_EXPRESSIONS
1545 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1547 parse_bitfield_cons
PARAMS ((expressionS
*exp
, unsigned int nbytes
));
1550 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1552 parse_mri_cons
PARAMS ((expressionS
*exp
));
1554 #ifdef REPEAT_CONS_EXPRESSIONS
1555 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1557 parse_repeat_cons
PARAMS ((expressionS
*exp
, unsigned int nbytes
));
1560 /* If we haven't gotten one yet, just call expression. */
1561 #ifndef TC_PARSE_CONS_EXPRESSION
1562 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1566 /* worker to do .byte etc statements */
1567 /* clobbers input_line_pointer, checks */
1571 register unsigned int nbytes
; /* 1=.byte, 2=.word, 4=.long */
1575 if (is_it_end_of_statement ())
1577 demand_empty_rest_of_line ();
1583 TC_PARSE_CONS_EXPRESSION (&exp
, nbytes
);
1584 emit_expr (&exp
, nbytes
);
1586 while (*input_line_pointer
++ == ',');
1588 input_line_pointer
--; /* Put terminator back into stream. */
1589 demand_empty_rest_of_line ();
1592 /* Put the contents of expression EXP into the object file using
1593 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1596 emit_expr (exp
, nbytes
)
1598 unsigned int nbytes
;
1603 /* Don't do anything if we are going to make another pass. */
1609 if (op
== O_absent
|| op
== O_illegal
)
1611 as_warn ("zero assumed for missing expression");
1612 exp
->X_add_number
= 0;
1615 else if (op
== O_big
)
1617 as_bad ("%s number invalid; zero assumed",
1618 exp
->X_add_number
> 0 ? "bignum" : "floating point");
1619 exp
->X_add_number
= 0;
1622 else if (op
== O_register
)
1624 as_warn ("register value used as expression");
1628 p
= frag_more (nbytes
);
1630 #ifndef WORKING_DOT_WORD
1631 /* If we have the difference of two symbols in a word, save it on
1632 the broken_words list. See the code in write.c. */
1633 if (op
== O_subtract
&& nbytes
== 2)
1635 struct broken_word
*x
;
1637 x
= (struct broken_word
*) xmalloc (sizeof (struct broken_word
));
1638 x
->next_broken_word
= broken_words
;
1641 x
->word_goes_here
= p
;
1643 x
->add
= exp
->X_add_symbol
;
1644 x
->sub
= exp
->X_op_symbol
;
1645 x
->addnum
= exp
->X_add_number
;
1652 if (op
== O_constant
)
1657 register long unmask
;
1659 /* JF << of >= number of bits in the object is undefined. In
1660 particular SPARC (Sun 4) has problems */
1661 if (nbytes
>= sizeof (long))
1664 mask
= ~0 << (BITS_PER_CHAR
* nbytes
); /* Don't store these bits. */
1666 unmask
= ~mask
; /* Do store these bits. */
1669 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1670 mask
= ~(unmask
>> 1); /* Includes sign bit now. */
1673 get
= exp
->X_add_number
;
1675 if ((get
& mask
) != 0 && (get
& mask
) != mask
)
1676 { /* Leading bits contain both 0s & 1s. */
1677 as_warn ("Value 0x%x truncated to 0x%x.", get
, use
);
1679 md_number_to_chars (p
, use
, nbytes
); /* put bytes in right order. */
1683 md_number_to_chars (p
, (long) 0, nbytes
);
1685 /* Now we need to generate a fixS to record the symbol value.
1686 This is easy for BFD. For other targets it can be more
1687 complex. For very complex cases (currently, the HPPA and
1688 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1689 want. For simpler cases, you can define TC_CONS_RELOC to be
1690 the name of the reloc code that should be stored in the fixS.
1691 If neither is defined, the code uses NO_RELOC if it is
1692 defined, and otherwise uses 0. */
1694 #ifdef BFD_ASSEMBLER
1695 fix_new_exp (frag_now
, p
- frag_now
->fr_literal
, nbytes
, exp
, 0,
1696 /* @@ Should look at CPU word size. */
1699 #ifdef TC_CONS_FIX_NEW
1700 TC_CONS_FIX_NEW (frag_now
, p
- frag_now
->fr_literal
, nbytes
, exp
);
1702 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1703 it is defined, otherwise use NO_RELOC if it is defined,
1705 #ifndef TC_CONS_RELOC
1707 #define TC_CONS_RELOC NO_RELOC
1709 #define TC_CONS_RELOC 0
1712 fix_new_exp (frag_now
, p
- frag_now
->fr_literal
, nbytes
, exp
, 0,
1714 #endif /* TC_CONS_FIX_NEW */
1715 #endif /* BFD_ASSEMBLER */
1719 #ifdef BITFIELD_CONS_EXPRESSIONS
1721 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1722 w:x,y:z, where w and y are bitwidths and x and y are values. They
1723 then pack them all together. We do a little better in that we allow
1724 them in words, longs, etc. and we'll pack them in target byte order
1727 The rules are: pack least significat bit first, if a field doesn't
1728 entirely fit, put it in the next unit. Overflowing the bitfield is
1729 explicitly *not* even a warning. The bitwidth should be considered
1732 To use this function the tc-XXX.h file should define
1733 BITFIELD_CONS_EXPRESSIONS. */
1736 parse_bitfield_cons (exp
, nbytes
)
1738 unsigned int nbytes
;
1740 unsigned int bits_available
= BITS_PER_CHAR
* nbytes
;
1741 char *hold
= input_line_pointer
;
1743 (void) expression (exp
);
1745 if (*input_line_pointer
== ':')
1751 unsigned long width
;
1753 if (*input_line_pointer
!= ':')
1755 input_line_pointer
= hold
;
1757 } /* next piece is not a bitfield */
1759 /* In the general case, we can't allow
1760 full expressions with symbol
1761 differences and such. The relocation
1762 entries for symbols not defined in this
1763 assembly would require arbitrary field
1764 widths, positions, and masks which most
1765 of our current object formats don't
1768 In the specific case where a symbol
1769 *is* defined in this assembly, we
1770 *could* build fixups and track it, but
1771 this could lead to confusion for the
1772 backends. I'm lazy. I'll take any
1773 SEG_ABSOLUTE. I think that means that
1774 you can use a previous .set or
1775 .equ type symbol. xoxorich. */
1777 if (exp
->X_op
== O_absent
)
1779 as_warn ("using a bit field width of zero");
1780 exp
->X_add_number
= 0;
1781 exp
->X_op
= O_constant
;
1782 } /* implied zero width bitfield */
1784 if (exp
->X_op
!= O_constant
)
1786 *input_line_pointer
= '\0';
1787 as_bad ("field width \"%s\" too complex for a bitfield", hold
);
1788 *input_line_pointer
= ':';
1789 demand_empty_rest_of_line ();
1793 if ((width
= exp
->X_add_number
) > (BITS_PER_CHAR
* nbytes
))
1795 as_warn ("field width %d too big to fit in %d bytes: truncated to %d bits",
1796 width
, nbytes
, (BITS_PER_CHAR
* nbytes
));
1797 width
= BITS_PER_CHAR
* nbytes
;
1800 if (width
> bits_available
)
1802 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1803 input_line_pointer
= hold
;
1804 exp
->X_add_number
= value
;
1808 hold
= ++input_line_pointer
; /* skip ':' */
1810 (void) expression (exp
);
1811 if (exp
->X_op
!= O_constant
)
1813 char cache
= *input_line_pointer
;
1815 *input_line_pointer
= '\0';
1816 as_bad ("field value \"%s\" too complex for a bitfield", hold
);
1817 *input_line_pointer
= cache
;
1818 demand_empty_rest_of_line ();
1822 value
|= ((~(-1 << width
) & exp
->X_add_number
)
1823 << ((BITS_PER_CHAR
* nbytes
) - bits_available
));
1825 if ((bits_available
-= width
) == 0
1826 || is_it_end_of_statement ()
1827 || *input_line_pointer
!= ',')
1830 } /* all the bitfields we're gonna get */
1832 hold
= ++input_line_pointer
;
1833 (void) expression (exp
);
1834 } /* forever loop */
1836 exp
->X_add_number
= value
;
1837 exp
->X_op
= O_constant
;
1838 } /* if looks like a bitfield */
1839 } /* parse_bitfield_cons() */
1841 #endif /* BITFIELD_CONS_EXPRESSIONS */
1846 parse_mri_cons (exp
, nbytes
)
1848 unsigned int nbytes
;
1850 if (*input_line_pointer
== '\'')
1852 /* An MRI style string, cut into as many bytes as will fit into
1853 a nbyte chunk, left justify if necessary, and separate with
1854 commas so we can try again later */
1856 unsigned int result
= 0;
1857 input_line_pointer
++;
1858 for (scan
= 0; scan
< nbytes
; scan
++)
1860 if (*input_line_pointer
== '\'')
1862 if (input_line_pointer
[1] == '\'')
1864 input_line_pointer
++;
1869 result
= (result
<< 8) | (*input_line_pointer
++);
1873 while (scan
< nbytes
)
1878 /* Create correct expression */
1879 exp
->X_op
= O_constant
;
1880 exp
->X_add_number
= result
;
1881 /* Fake it so that we can read the next char too */
1882 if (input_line_pointer
[0] != '\'' ||
1883 (input_line_pointer
[0] == '\'' && input_line_pointer
[1] == '\''))
1885 input_line_pointer
-= 2;
1886 input_line_pointer
[0] = ',';
1887 input_line_pointer
[1] = '\'';
1890 input_line_pointer
++;
1898 #ifdef REPEAT_CONS_EXPRESSIONS
1900 /* Parse a repeat expression for cons. This is used by the MIPS
1901 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1902 object file COUNT times.
1904 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1907 parse_repeat_cons (exp
, nbytes
)
1909 unsigned int nbytes
;
1916 if (*input_line_pointer
!= ':')
1918 /* No repeat count. */
1922 ++input_line_pointer
;
1923 expression (&count
);
1924 if (count
.X_op
!= O_constant
1925 || count
.X_add_number
<= 0)
1927 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1931 /* The cons function is going to output this expression once. So we
1932 output it count - 1 times. */
1933 for (i
= count
.X_add_number
- 1; i
> 0; i
--)
1934 emit_expr (exp
, nbytes
);
1937 #endif /* REPEAT_CONS_EXPRESSIONS */
1942 * CONStruct more frag(s) of .quads, or .octa etc.
1943 * Makes 0 or more new frags.
1944 * If need_pass_2 == 1, generate no frag.
1945 * This understands only bignums, not expressions. Cons() understands
1948 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
1950 * This creates objects with struct obstack_control objs, destroying
1951 * any context objs held about a partially completed object. Beware!
1954 * I think it sucks to have 2 different types of integers, with 2
1955 * routines to read them, store them etc.
1956 * It would be nicer to permit bignums in expressions and only
1957 * complain if the result overflowed. However, due to "efficiency"...
1959 /* worker to do .quad etc statements */
1960 /* clobbers input_line_pointer, checks */
1962 /* 8=.quad 16=.octa ... */
1966 register int nbytes
;
1968 register char c
; /* input_line_pointer->c. */
1970 register long length
; /* Number of chars in an object. */
1971 register int digit
; /* Value of 1 digit. */
1972 register int carry
; /* For multi-precision arithmetic. */
1973 register int work
; /* For multi-precision arithmetic. */
1974 register char *p
; /* For multi-precision arithmetic. */
1976 extern const char hex_value
[]; /* In hex_value.c. */
1979 * The following awkward logic is to parse ZERO or more strings,
1980 * comma seperated. Recall an expression includes its leading &
1981 * trailing blanks. We fake a leading ',' if there is (supposed to
1982 * be) a 1st expression, and keep demanding 1 expression for each ','.
1984 if (is_it_end_of_statement ())
1986 c
= 0; /* Skip loop. */
1990 c
= ','; /* Do loop. */
1991 --input_line_pointer
;
1995 ++input_line_pointer
;
1997 c
= *input_line_pointer
;
1998 /* C contains 1st non-blank character of what we hope is a number. */
2001 c
= *++input_line_pointer
;
2002 if (c
== 'x' || c
== 'X')
2004 c
= *++input_line_pointer
;
2017 * This feature (?) is here to stop people worrying about
2018 * mysterious zero constants: which is what they get when
2019 * they completely omit digits.
2021 if (hex_value
[c
] >= radix
)
2023 as_bad ("Missing digits. 0 assumed.");
2025 bignum_high
= bignum_low
- 1; /* Start constant with 0 chars. */
2026 for (; (digit
= hex_value
[c
]) < radix
; c
= *++input_line_pointer
)
2028 /* Multiply existing number by radix, then add digit. */
2030 for (p
= bignum_low
; p
<= bignum_high
; p
++)
2032 work
= (*p
& MASK_CHAR
) * radix
+ carry
;
2033 *p
= work
& MASK_CHAR
;
2034 carry
= work
>> BITS_PER_CHAR
;
2039 *bignum_high
= carry
& MASK_CHAR
;
2040 know ((carry
& ~MASK_CHAR
) == 0);
2043 length
= bignum_high
- bignum_low
+ 1;
2044 if (length
> nbytes
)
2046 as_warn ("Most significant bits truncated in integer constant.");
2050 register long leading_zeroes
;
2052 for (leading_zeroes
= nbytes
- length
;
2062 char *src
= bignum_low
;
2063 p
= frag_more (nbytes
);
2064 if (target_big_endian
)
2067 for (i
= nbytes
- 1; i
>= 0; i
--)
2071 memcpy (p
, bignum_low
, (int) nbytes
);
2073 /* C contains character after number. */
2075 c
= *input_line_pointer
;
2076 /* C contains 1st non-blank character after number. */
2078 demand_empty_rest_of_line ();
2081 /* Extend bignum by 1 char. */
2085 register long length
;
2088 if (bignum_high
>= bignum_limit
)
2090 length
= bignum_limit
- bignum_low
;
2091 bignum_low
= xrealloc (bignum_low
, length
+ length
);
2092 bignum_high
= bignum_low
+ length
;
2093 bignum_limit
= bignum_low
+ length
+ length
;
2095 } /* grow_bignum(); */
2100 * CONStruct some more frag chars of .floats .ffloats etc.
2101 * Makes 0 or more new frags.
2102 * If need_pass_2 == 1, no frags are emitted.
2103 * This understands only floating literals, not expressions. Sorry.
2105 * A floating constant is defined by atof_generic(), except it is preceded
2106 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2107 * reading, I decided to be incompatible. This always tries to give you
2108 * rounded bits to the precision of the pseudo-op. Former AS did premature
2109 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2110 * a choice of 2 flavours of noise according to which of 2 floating-point
2111 * scanners you directed AS to use.
2113 * In: input_line_pointer->whitespace before, or '0' of flonum.
2117 void /* JF was static, but can't be if VAX.C is goning to use it */
2118 float_cons (float_type
) /* Worker to do .float etc statements. */
2119 /* Clobbers input_line-pointer, checks end-of-line. */
2120 register int float_type
; /* 'f':.ffloat ... 'F':.float ... */
2123 int length
; /* Number of chars in an object. */
2124 register char *err
; /* Error from scanning floating literal. */
2125 char temp
[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT
];
2127 if (is_it_end_of_statement ())
2129 demand_empty_rest_of_line ();
2135 /* input_line_pointer->1st char of a flonum (we hope!). */
2138 /* Skip any 0{letter} that may be present. Don't even check if the
2139 * letter is legal. Someone may invent a "z" format and this routine
2140 * has no use for such information. Lusers beware: you get
2141 * diagnostics if your input is ill-conditioned.
2143 if (input_line_pointer
[0] == '0' && isalpha (input_line_pointer
[1]))
2144 input_line_pointer
+= 2;
2146 err
= md_atof (float_type
, temp
, &length
);
2147 know (length
<= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT
);
2151 as_bad ("Bad floating literal: %s", err
);
2152 ignore_rest_of_line ();
2162 #ifdef REPEAT_CONS_EXPRESSIONS
2163 if (*input_line_pointer
== ':')
2165 expressionS count_exp
;
2167 ++input_line_pointer
;
2168 expression (&count_exp
);
2169 if (count_exp
.X_op
!= O_constant
2170 || count_exp
.X_add_number
<= 0)
2172 as_warn ("unresolvable or nonpositive repeat count; using 1");
2175 count
= count_exp
.X_add_number
;
2179 while (--count
>= 0)
2181 p
= frag_more (length
);
2182 memcpy (p
, temp
, length
);
2187 while (*input_line_pointer
++ == ',');
2189 --input_line_pointer
; /* Put terminator back into stream. */
2190 demand_empty_rest_of_line ();
2191 } /* float_cons() */
2196 * We read 0 or more ',' seperated, double-quoted strings.
2198 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2203 stringer (append_zero
) /* Worker to do .ascii etc statements. */
2204 /* Checks end-of-line. */
2205 register int append_zero
; /* 0: don't append '\0', else 1 */
2207 register unsigned int c
;
2210 * The following awkward logic is to parse ZERO or more strings,
2211 * comma seperated. Recall a string expression includes spaces
2212 * before the opening '\"' and spaces after the closing '\"'.
2213 * We fake a leading ',' if there is (supposed to be)
2214 * a 1st, expression. We keep demanding expressions for each
2217 if (is_it_end_of_statement ())
2219 c
= 0; /* Skip loop. */
2220 ++input_line_pointer
; /* Compensate for end of loop. */
2224 c
= ','; /* Do loop. */
2226 while (c
== ',' || c
== '<' || c
== '"')
2229 switch (*input_line_pointer
)
2232 ++input_line_pointer
; /*->1st char of string. */
2233 while (is_a_char (c
= next_char_of_string ()))
2235 FRAG_APPEND_1_CHAR (c
);
2239 FRAG_APPEND_1_CHAR (0);
2241 know (input_line_pointer
[-1] == '\"');
2244 input_line_pointer
++;
2245 c
= get_single_number ();
2246 FRAG_APPEND_1_CHAR (c
);
2247 if (*input_line_pointer
!= '>')
2249 as_bad ("Expected <nn>");
2251 input_line_pointer
++;
2254 input_line_pointer
++;
2258 c
= *input_line_pointer
;
2261 demand_empty_rest_of_line ();
2264 /* FIXME-SOMEDAY: I had trouble here on characters with the
2265 high bits set. We'll probably also have trouble with
2266 multibyte chars, wide chars, etc. Also be careful about
2267 returning values bigger than 1 byte. xoxorich. */
2270 next_char_of_string ()
2272 register unsigned int c
;
2274 c
= *input_line_pointer
++ & CHAR_MASK
;
2282 switch (c
= *input_line_pointer
++)
2312 break; /* As itself. */
2327 for (number
= 0; isdigit (c
); c
= *input_line_pointer
++)
2329 number
= number
* 8 + c
- '0';
2333 --input_line_pointer
;
2337 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2338 as_warn ("Unterminated string: Newline inserted.");
2344 #ifdef ONLY_STANDARD_ESCAPES
2345 as_bad ("Bad escaped character in string, '?' assumed");
2347 #endif /* ONLY_STANDARD_ESCAPES */
2350 } /* switch on escaped char */
2355 } /* switch on char */
2357 } /* next_char_of_string() */
2360 get_segmented_expression (expP
)
2361 register expressionS
*expP
;
2363 register segT retval
;
2365 retval
= expression (expP
);
2366 if (expP
->X_op
== O_illegal
2367 || expP
->X_op
== O_absent
2368 || expP
->X_op
== O_big
)
2370 as_bad ("expected address expression; zero assumed");
2371 expP
->X_op
= O_constant
;
2372 expP
->X_add_number
= 0;
2373 retval
= absolute_section
;
2379 get_known_segmented_expression (expP
)
2380 register expressionS
*expP
;
2382 register segT retval
;
2384 if ((retval
= get_segmented_expression (expP
)) == undefined_section
)
2386 /* There is no easy way to extract the undefined symbol from the
2388 if (expP
->X_add_symbol
!= NULL
2389 && S_GET_SEGMENT (expP
->X_add_symbol
) != expr_section
)
2390 as_warn ("symbol \"%s\" undefined; zero assumed",
2391 S_GET_NAME (expP
->X_add_symbol
));
2393 as_warn ("some symbol undefined; zero assumed");
2394 retval
= absolute_section
;
2395 expP
->X_op
= O_constant
;
2396 expP
->X_add_number
= 0;
2398 know (retval
== absolute_section
|| SEG_NORMAL (retval
));
2400 } /* get_known_segmented_expression() */
2402 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2403 get_absolute_expression ()
2408 if (exp
.X_op
!= O_constant
)
2410 if (exp
.X_op
!= O_absent
)
2411 as_bad ("bad absolute expression; zero assumed");
2412 exp
.X_add_number
= 0;
2414 return exp
.X_add_number
;
2417 char /* return terminator */
2418 get_absolute_expression_and_terminator (val_pointer
)
2419 long *val_pointer
; /* return value of expression */
2421 *val_pointer
= get_absolute_expression ();
2422 return (*input_line_pointer
++);
2426 * demand_copy_C_string()
2428 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2429 * Give a warning if that happens.
2432 demand_copy_C_string (len_pointer
)
2437 if ((s
= demand_copy_string (len_pointer
)) != 0)
2441 for (len
= *len_pointer
;
2450 as_bad ("This string may not contain \'\\0\'");
2458 * demand_copy_string()
2460 * Demand string, but return a safe (=private) copy of the string.
2461 * Return NULL if we can't read a string here.
2464 demand_copy_string (lenP
)
2467 register unsigned int c
;
2473 if (*input_line_pointer
== '\"')
2475 input_line_pointer
++; /* Skip opening quote. */
2477 while (is_a_char (c
= next_char_of_string ()))
2479 obstack_1grow (¬es
, c
);
2482 /* JF this next line is so demand_copy_C_string will return a null
2483 termanated string. */
2484 obstack_1grow (¬es
, '\0');
2485 retval
= obstack_finish (¬es
);
2489 as_warn ("Missing string");
2491 ignore_rest_of_line ();
2495 } /* demand_copy_string() */
2498 * is_it_end_of_statement()
2500 * In: Input_line_pointer->next character.
2502 * Do: Skip input_line_pointer over all whitespace.
2504 * Out: 1 if input_line_pointer->end-of-line.
2507 is_it_end_of_statement ()
2510 return (is_end_of_line
[*input_line_pointer
]);
2511 } /* is_it_end_of_statement() */
2517 register symbolS
*symbolP
; /* symbol we are working with */
2519 input_line_pointer
++;
2520 if (*input_line_pointer
== '=')
2521 input_line_pointer
++;
2523 while (*input_line_pointer
== ' ' || *input_line_pointer
== '\t')
2524 input_line_pointer
++;
2526 if (sym_name
[0] == '.' && sym_name
[1] == '\0')
2528 /* Turn '. = mumble' into a .org mumble */
2529 register segT segment
;
2533 segment
= get_known_segmented_expression (&exp
);
2536 if (segment
!= now_seg
&& segment
!= absolute_section
)
2537 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2538 segment_name (segment
),
2539 segment_name (now_seg
));
2540 p
= frag_var (rs_org
, 1, 1, (relax_substateT
) 0, exp
.X_add_symbol
,
2541 exp
.X_add_number
, (char *) 0);
2543 } /* if (ok to make frag) */
2547 symbolP
= symbol_find_or_make (sym_name
);
2548 pseudo_set (symbolP
);
2552 /* .include -- include a file at this point. */
2565 filename
= demand_copy_string (&i
);
2566 demand_empty_rest_of_line ();
2567 path
= xmalloc (i
+ include_dir_maxlen
+ 5 /* slop */ );
2568 for (i
= 0; i
< include_dir_count
; i
++)
2570 strcpy (path
, include_dirs
[i
]);
2572 strcat (path
, filename
);
2573 if (0 != (try = fopen (path
, "r")))
2582 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2583 newbuf
= input_scrub_include_file (path
, input_line_pointer
);
2584 buffer_limit
= input_scrub_next_buffer (&input_line_pointer
);
2588 add_include_dir (path
)
2593 if (include_dir_count
== 0)
2595 include_dirs
= (char **) xmalloc (2 * sizeof (*include_dirs
));
2596 include_dirs
[0] = "."; /* Current dir */
2597 include_dir_count
= 2;
2601 include_dir_count
++;
2602 include_dirs
= (char **) realloc (include_dirs
,
2603 include_dir_count
* sizeof (*include_dirs
));
2606 include_dirs
[include_dir_count
- 1] = path
; /* New one */
2609 if (i
> include_dir_maxlen
)
2610 include_dir_maxlen
= i
;
2611 } /* add_include_dir() */
2617 while (!is_end_of_line
[*input_line_pointer
])
2619 ++input_line_pointer
;
2621 ++input_line_pointer
;