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. */
48 #ifndef TC_START_LABEL
49 #define TC_START_LABEL(x,y) (x==':')
52 /* The NOP_OPCODE is for the alignment fill value.
53 * fill it a nop instruction so that the disassembler does not choke
57 #define NOP_OPCODE 0x00
60 char *input_line_pointer; /*->next char of source file to parse. */
62 #if BITS_PER_CHAR != 8
63 /* The following table is indexed by[(char)] and will break if
64 a char does not have exactly 256 states (hopefully 0:255!)! */
69 /* The m88k unfortunately uses @ as a label beginner. */
73 /* used by is_... macros. our ctype[] */
74 const char lex_type[256] =
76 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
77 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
78 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
79 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
80 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
81 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
82 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
83 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
84 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
85 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
86 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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,
96 * Out: 1 if this character ends a line.
99 char is_end_of_line[256] =
102 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
104 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
106 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
108 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
109 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
111 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
112 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
114 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
115 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
116 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
117 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
118 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
121 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
122 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
126 /* Functions private to this file. */
128 static char *buffer; /* 1st char of each buffer of lines is here. */
129 static char *buffer_limit; /*->1 + last char in buffer. */
131 int target_big_endian;
133 static char *old_buffer; /* JF a hack */
134 static char *old_input;
135 static char *old_limit;
137 /* Variables for handling include file directory list. */
139 char **include_dirs; /* List of pointers to directories to
140 search for .include's */
141 int include_dir_count; /* How many are in the list */
142 int include_dir_maxlen = 1;/* Length of longest in list */
144 #ifndef WORKING_DOT_WORD
145 struct broken_word *broken_words;
146 int new_broken_words;
149 static char *demand_copy_string PARAMS ((int *lenP));
150 int is_it_end_of_statement PARAMS ((void));
151 static segT get_segmented_expression PARAMS ((expressionS *expP));
152 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
153 static void pobegin PARAMS ((void));
162 obj_read_begin_hook ();
164 /* Something close -- but not too close -- to a multiple of 1024.
165 The debugging malloc I'm using has 24 bytes of overhead. */
166 obstack_begin (¬es, 5090);
167 obstack_begin (&cond_obstack, 990);
169 /* Use machine dependent syntax */
170 for (p = line_separator_chars; *p; p++)
171 is_end_of_line[(unsigned char) *p] = 1;
172 /* Use more. FIXME-SOMEDAY. */
175 /* set up pseudo-op tables */
177 struct hash_control *po_hash;
179 static const pseudo_typeS potable[] =
181 {"abort", s_abort, 0},
182 {"align", s_align_ptwo, 0},
183 {"ascii", stringer, 0},
184 {"asciz", stringer, 1},
193 {"double", float_cons, 'd'},
195 {"eject", listing_eject, 0}, /* Formfeed listing */
198 {"endif", s_endif, 0},
203 {"extern", s_ignore, 0}, /* We treat all undef as ext */
204 {"appfile", s_app_file, 1},
205 {"appline", s_app_line, 0},
206 {"file", s_app_file, 0},
208 {"float", float_cons, 'f'},
209 {"global", s_globl, 0},
210 {"globl", s_globl, 0},
213 {"ifdef", s_ifdef, 0},
214 {"ifeqs", s_ifeqs, 0},
215 {"ifndef", s_ifdef, 1},
216 {"ifnes", s_ifeqs, 1},
217 {"ifnotdef", s_ifdef, 1},
218 {"include", s_include, 0},
220 {"lcomm", s_lcomm, 0},
221 {"lflags", listing_flags, 0}, /* Listing flags */
222 {"list", listing_list, 1}, /* Turn listing on */
225 {"nolist", listing_list, 0}, /* Turn listing off */
228 {"psize", listing_psize, 0}, /* set paper size */
231 {"sbttl", listing_title, 1}, /* Subtitle of listing */
236 {"single", float_cons, 'f'},
238 {"space", s_space, 0},
239 {"stabd", s_stab, 'd'},
240 {"stabn", s_stab, 'n'},
241 {"stabs", s_stab, 's'},
242 {"string", stringer, 1},
245 {"title", listing_title, 0}, /* Listing title */
249 {"xstabs", s_xstab, 's'},
251 {NULL} /* end sentinel */
257 const char *errtxt; /* error text */
258 const pseudo_typeS *pop;
260 po_hash = hash_new ();
262 /* Do the target-specific pseudo ops. */
263 for (pop = md_pseudo_table; pop->poc_name; pop++)
265 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
268 as_fatal ("error constructing md pseudo-op table");
272 /* Now object specific. Skip any that were in the target table. */
273 for (pop = obj_pseudo_table; pop->poc_name; pop++)
275 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
278 if (!strcmp (errtxt, "exists"))
280 #ifdef DIE_ON_OVERRIDES
281 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
282 #endif /* DIE_ON_OVERRIDES */
283 continue; /* OK if target table overrides. */
287 as_fatal ("error constructing obj pseudo-op table");
288 } /* if overridden */
292 /* Now portable ones. Skip any that we've seen already. */
293 for (pop = potable; pop->poc_name; pop++)
295 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
298 if (!strcmp (errtxt, "exists"))
300 #ifdef DIE_ON_OVERRIDES
301 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
302 #endif /* DIE_ON_OVERRIDES */
303 continue; /* OK if target table overrides. */
307 as_fatal ("error constructing obj pseudo-op table");
308 } /* if overridden */
315 #define HANDLE_CONDITIONAL_ASSEMBLY() \
316 if (ignore_input ()) \
318 while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
319 if (input_line_pointer == buffer_limit) \
325 /* read_a_source_file()
327 * We read the file, putting things into a web that
328 * represents what we have been reading.
331 read_a_source_file (name)
335 register char *s; /* string of symbol, '\0' appended */
339 buffer = input_scrub_new_file (name);
342 listing_newline ("");
344 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
345 { /* We have another line to parse. */
346 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
347 contin: /* JF this goto is my fault I admit it.
348 Someone brave please re-write the whole
349 input section here? Pleeze??? */
350 while (input_line_pointer < buffer_limit)
352 /* We have more of this buffer to parse. */
355 * We now have input_line_pointer->1st char of next line.
356 * If input_line_pointer [-1] == '\n' then we just
357 * scanned another line: so bump line counters.
359 if (is_end_of_line[(unsigned char) input_line_pointer[-1]])
361 if (input_line_pointer[-1] == '\n')
362 bump_line_counters ();
364 #if defined (MRI) || defined (LABELS_WITHOUT_COLONS)
365 /* Text at the start of a line must be a label, we run down
366 and stick a colon in. */
367 if (is_name_beginner (*input_line_pointer))
369 char *line_start = input_line_pointer;
370 char c = get_symbol_end ();
372 *input_line_pointer = c;
374 input_line_pointer++;
382 * We are at the begining of a line, or similar place.
383 * We expect a well-formed assembler statement.
384 * A "symbol-name:" is a statement.
386 * Depending on what compiler is used, the order of these tests
387 * may vary to catch most common case 1st.
388 * Each test is independent of all other tests at the (top) level.
389 * PLEASE make a compiler that doesn't use this assembler.
390 * It is crufty to waste a compiler's time encoding things for this
391 * assembler, which then wastes more time decoding it.
392 * (And communicating via (linear) files is silly!
393 * If you must pass stuff, please pass a tree!)
395 if ((c = *input_line_pointer++) == '\t'
400 c = *input_line_pointer++;
402 know (c != ' '); /* No further leading whitespace. */
405 * C is the 1st significant character.
406 * Input_line_pointer points after that character.
408 if (is_name_beginner (c))
409 { /* want user-defined label or pseudo/opcode */
410 HANDLE_CONDITIONAL_ASSEMBLY ();
412 s = --input_line_pointer;
413 c = get_symbol_end (); /* name's delimiter */
415 * C is character after symbol.
416 * That character's place in the input line is now '\0'.
417 * S points to the beginning of the symbol.
418 * [In case of pseudo-op, s->'.'.]
419 * Input_line_pointer->'\0' where c was.
421 if (TC_START_LABEL(c, input_line_pointer))
423 colon (s); /* user-defined label */
424 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
425 /* Input_line_pointer->after ':'. */
431 || (input_line_pointer[1] == '='
432 #ifdef TC_EQUAL_IN_INSN
433 && ! TC_EQUAL_IN_INSN (c, input_line_pointer)
438 demand_empty_rest_of_line ();
441 { /* expect pseudo-op or machine instruction */
443 if (!done_pseudo (s))
449 #define IGNORE_OPCODE_CASE
450 #ifdef IGNORE_OPCODE_CASE
463 /* The m88k uses pseudo-ops without a period. */
464 pop = (pseudo_typeS *) hash_find (po_hash, s);
465 if (pop != NULL && pop->poc_handler == NULL)
469 if (pop != NULL || *s == '.')
474 * WARNING: c has next char, which may be end-of-line.
475 * We lookup the pseudo-op table with s+1 because we
476 * already know that the pseudo-op begins with a '.'.
480 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
482 /* Print the error msg now, while we still can */
485 as_bad ("Unknown pseudo-op: `%s'", s);
486 *input_line_pointer = c;
491 /* Put it back for error messages etc. */
492 *input_line_pointer = c;
493 /* The following skip of whitespace is compulsory.
494 A well shaped space is sometimes all that separates
495 keyword from operands. */
496 if (c == ' ' || c == '\t')
497 input_line_pointer++;
499 * Input_line is restored.
500 * Input_line_pointer->1st non-blank char
501 * after pseudo-operation.
503 (*pop->poc_handler) (pop->poc_val);
507 { /* machine instruction */
508 /* WARNING: c has char, which may be end-of-line. */
509 /* Also: input_line_pointer->`\0` where c was. */
510 *input_line_pointer = c;
511 while (!is_end_of_line[(unsigned char) *input_line_pointer]
512 #ifdef TC_EOL_IN_INSN
513 || TC_EOL_IN_INSN (input_line_pointer)
517 input_line_pointer++;
520 c = *input_line_pointer;
521 *input_line_pointer = '\0';
523 md_assemble (s); /* Assemble 1 instruction. */
525 *input_line_pointer++ = c;
527 /* We resume loop AFTER the end-of-line from
532 } /* if (is_name_beginner(c) */
535 /* Empty statement? */
536 if (is_end_of_line[(unsigned char) c])
539 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
542 /* local label ("4:") */
543 char *backup = input_line_pointer;
545 HANDLE_CONDITIONAL_ASSEMBLY ();
549 while (isdigit (*input_line_pointer))
551 temp = (temp * 10) + *input_line_pointer - '0';
552 ++input_line_pointer;
553 } /* read the whole number */
555 #ifdef LOCAL_LABELS_DOLLAR
556 if (*input_line_pointer == '$'
557 && *(input_line_pointer + 1) == ':')
559 input_line_pointer += 2;
561 if (dollar_label_defined (temp))
563 as_fatal ("label \"%d$\" redefined", temp);
566 define_dollar_label (temp);
567 colon (dollar_label_name (temp, 0));
570 #endif /* LOCAL_LABELS_DOLLAR */
572 #ifdef LOCAL_LABELS_FB
573 if (*input_line_pointer++ == ':')
575 fb_label_instance_inc (temp);
576 colon (fb_label_name (temp, 0));
579 #endif /* LOCAL_LABELS_FB */
581 input_line_pointer = backup;
582 } /* local label ("4:") */
583 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
585 if (c && strchr (line_comment_chars, c))
586 { /* Its a comment. Better say APP or NO_APP */
590 unsigned int new_length;
592 extern char *scrub_string, *scrub_last_string;
594 bump_line_counters ();
595 s = input_line_pointer;
596 if (strncmp (s, "APP\n", 4))
597 continue; /* We ignore it */
600 ends = strstr (s, "#NO_APP\n");
604 unsigned int tmp_len;
607 /* The end of the #APP wasn't in this buffer. We
608 keep reading in buffers until we find the #NO_APP
609 that goes with this #APP There is one. The specs
611 tmp_len = buffer_limit - s;
612 tmp_buf = xmalloc (tmp_len + 1);
613 memcpy (tmp_buf, s, tmp_len);
616 new_tmp = input_scrub_next_buffer (&buffer);
620 buffer_limit = new_tmp;
621 input_line_pointer = buffer;
622 ends = strstr (buffer, "#NO_APP\n");
626 num = buffer_limit - buffer;
628 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
629 memcpy (tmp_buf, buffer + tmp_len, num);
634 input_line_pointer = ends ? ends + 8 : NULL;
642 input_line_pointer = ends + 8;
644 new_buf = xmalloc (100);
649 scrub_last_string = ends;
654 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
658 if (new_tmp == new_buf + new_length)
660 new_buf = xrealloc (new_buf, new_length + 100);
661 new_tmp = new_buf + new_length;
669 old_input = input_line_pointer;
670 old_limit = buffer_limit;
672 input_line_pointer = new_buf;
673 buffer_limit = new_tmp;
677 HANDLE_CONDITIONAL_ASSEMBLY ();
679 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
680 input_line_pointer--; /* Report unknown char as ignored. */
681 ignore_rest_of_line ();
682 } /* while (input_line_pointer<buffer_limit) */
685 bump_line_counters ();
689 input_line_pointer = old_input;
690 buffer_limit = old_limit;
695 } /* while (more buffers to scan) */
696 input_scrub_close (); /* Close the input file */
704 as_fatal (".abort detected. Abandoning ship.");
707 /* Guts of .align directive. */
714 md_do_align (n, fill, just_record_alignment);
718 /* @@ Fix this right for BFD! */
720 static char nop_opcode = NOP_OPCODE;
722 if (now_seg != data_section && now_seg != bss_section)
731 /* Only make a frag if we HAVE to. . . */
732 if (n && !need_pass_2)
733 frag_align (n, *fill);
735 just_record_alignment:
736 record_alignment (now_seg, n);
739 /* For machines where ".align 4" means align to a 4 byte boundary. */
744 register unsigned int temp;
747 unsigned long max_alignment = 1 << 15;
749 if (is_end_of_line[(unsigned char) *input_line_pointer])
750 temp = arg; /* Default value from pseudo-op table */
752 temp = get_absolute_expression ();
754 if (temp > max_alignment)
756 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
759 /* For the sparc, `.align (1<<n)' actually means `.align n' so we
760 have to convert it. */
763 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
767 as_bad ("Alignment not a power of 2");
770 if (*input_line_pointer == ',')
772 input_line_pointer++;
773 temp_fill = get_absolute_expression ();
774 do_align (temp, &temp_fill);
777 do_align (temp, (char *) 0);
779 demand_empty_rest_of_line ();
782 /* For machines where ".align 4" means align to 2**4 boundary. */
784 s_align_ptwo (ignore)
789 long max_alignment = 15;
791 temp = get_absolute_expression ();
792 if (temp > max_alignment)
793 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
796 as_bad ("Alignment negative. 0 assumed.");
799 if (*input_line_pointer == ',')
801 input_line_pointer++;
802 temp_fill = get_absolute_expression ();
803 do_align (temp, &temp_fill);
806 do_align (temp, (char *) 0);
808 demand_empty_rest_of_line ();
819 register symbolS *symbolP;
821 name = input_line_pointer;
822 c = get_symbol_end ();
823 /* just after name is now '\0' */
824 p = input_line_pointer;
827 if (*input_line_pointer != ',')
829 as_bad ("Expected comma after symbol-name: rest of line ignored.");
830 ignore_rest_of_line ();
833 input_line_pointer++; /* skip ',' */
834 if ((temp = get_absolute_expression ()) < 0)
836 as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
837 ignore_rest_of_line ();
841 symbolP = symbol_find_or_make (name);
843 if (S_IS_DEFINED (symbolP))
845 as_bad ("Ignoring attempt to re-define symbol");
846 ignore_rest_of_line ();
849 if (S_GET_VALUE (symbolP))
851 if (S_GET_VALUE (symbolP) != (valueT) temp)
852 as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
853 S_GET_NAME (symbolP),
854 (long) S_GET_VALUE (symbolP),
859 S_SET_VALUE (symbolP, (valueT) temp);
860 S_SET_EXTERNAL (symbolP);
863 if ( (!temp) || !flagseen['1'])
864 S_GET_OTHER(symbolP) = const_flag;
865 #endif /* not OBJ_VMS */
866 know (symbolP->sy_frag == &zero_address_frag);
867 demand_empty_rest_of_line ();
877 temp = get_absolute_expression ();
880 section = text_section;
884 section = data_section;
886 subseg_set (section, (subsegT) temp);
891 demand_empty_rest_of_line ();
894 /* Handle the .appfile pseudo-op. This is automatically generated by
895 do_scrub_next_char when a preprocessor # line comment is seen with
896 a file name. This default definition may be overridden by the
897 object or CPU specific pseudo-ops. This function is also the
898 default definition for .file; the APPFILE argument is 1 for
899 .appfile, 0 for .file. */
908 /* Some assemblers tolerate immediately following '"' */
909 if ((s = demand_copy_string (&length)) != 0)
911 /* If this is a fake .appfile, a fake newline was inserted into
912 the buffer. Passing -2 to new_logical_line tells it to
914 new_logical_line (s, appfile ? -2 : -1);
915 demand_empty_rest_of_line ();
918 listing_source_file (s);
922 c_dot_file_symbol (s);
923 #endif /* OBJ_COFF */
929 /* Handle the .appline pseudo-op. This is automatically generated by
930 do_scrub_next_char when a preprocessor # line comment is seen.
931 This default definition may be overridden by the object or CPU
932 specific pseudo-ops. */
940 /* The given number is that of the next line. */
941 l = get_absolute_expression () - 1;
942 new_logical_line ((char *) NULL, l);
945 listing_source_line (l);
947 demand_empty_rest_of_line ();
954 long temp_repeat = 0;
956 register long temp_fill = 0;
960 temp_repeat = get_absolute_expression ();
961 if (*input_line_pointer == ',')
963 input_line_pointer++;
964 temp_size = get_absolute_expression ();
965 if (*input_line_pointer == ',')
967 input_line_pointer++;
968 temp_fill = get_absolute_expression ();
971 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
972 #define BSD_FILL_SIZE_CROCK_8 (8)
973 if (temp_size > BSD_FILL_SIZE_CROCK_8)
975 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
976 temp_size = BSD_FILL_SIZE_CROCK_8;
980 as_warn ("Size negative: .fill ignored.");
983 else if (temp_repeat <= 0)
985 as_warn ("Repeat < 0, .fill ignored");
989 if (temp_size && !need_pass_2)
991 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
992 memset (p, 0, (unsigned int) temp_size);
993 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
994 * flavoured AS. The following bizzare behaviour is to be
995 * compatible with above. I guess they tried to take up to 8
996 * bytes from a 4-byte expression and they forgot to sign
997 * extend. Un*x Sux. */
998 #define BSD_FILL_SIZE_CROCK_4 (4)
999 md_number_to_chars (p, (valueT) temp_fill,
1000 (temp_size > BSD_FILL_SIZE_CROCK_4
1001 ? BSD_FILL_SIZE_CROCK_4
1002 : (int) temp_size));
1003 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
1004 * but emits no error message because it seems a legal thing to do.
1005 * It is a degenerate case of .fill but could be emitted by a compiler.
1008 demand_empty_rest_of_line ();
1021 name = input_line_pointer;
1022 c = get_symbol_end ();
1023 symbolP = symbol_find_or_make (name);
1024 *input_line_pointer = c;
1026 S_SET_EXTERNAL (symbolP);
1029 input_line_pointer++;
1031 if (*input_line_pointer == '\n')
1036 demand_empty_rest_of_line ();
1040 s_lcomm (needs_align)
1041 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1042 (alignment); 0 if it was an ".lcomm" (2 args only) */
1045 register char *name;
1049 register symbolS *symbolP;
1050 segT current_seg = now_seg;
1051 subsegT current_subseg = now_subseg;
1052 const int max_alignment = 15;
1054 segT bss_seg = bss_section;
1056 name = input_line_pointer;
1057 c = get_symbol_end ();
1058 p = input_line_pointer;
1062 /* Accept an optional comma after the name. The comma used to be
1063 required, but Irix 5 cc does not generate it. */
1064 if (*input_line_pointer == ',')
1066 ++input_line_pointer;
1070 if (*input_line_pointer == '\n')
1072 as_bad ("Missing size expression");
1076 if ((temp = get_absolute_expression ()) < 0)
1078 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1079 ignore_rest_of_line ();
1083 #if defined (TC_MIPS) || defined (TC_ALPHA)
1084 #if defined (OBJ_ECOFF) || defined (OBJ_ELF)
1085 /* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
1086 if (temp <= bfd_get_gp_size (stdoutput))
1088 bss_seg = subseg_new (".sbss", 1);
1089 seg_info (bss_seg)->bss = 1;
1095 /* FIXME. This needs to be machine independent. */
1103 record_alignment(bss_seg, align);
1110 if (*input_line_pointer != ',')
1112 as_bad ("Expected comma after size");
1113 ignore_rest_of_line ();
1116 input_line_pointer++;
1118 if (*input_line_pointer == '\n')
1120 as_bad ("Missing alignment");
1123 align = get_absolute_expression ();
1124 if (align > max_alignment)
1126 align = max_alignment;
1127 as_warn ("Alignment too large: %d. assumed.", align);
1132 as_warn ("Alignment negative. 0 assumed.");
1134 record_alignment (bss_seg, align);
1135 } /* if needs align */
1138 /* Assume some objects may require alignment on some systems. */
1142 align = ffs (temp) - 1;
1143 if (temp % (1 << align))
1150 symbolP = symbol_find_or_make (name);
1154 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1155 S_GET_OTHER (symbolP) == 0 &&
1156 S_GET_DESC (symbolP) == 0 &&
1157 #endif /* OBJ_AOUT or OBJ_BOUT */
1158 (S_GET_SEGMENT (symbolP) == bss_seg
1159 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1163 subseg_set (bss_seg, 1);
1166 frag_align (align, 0);
1167 /* detach from old frag */
1168 if (S_GET_SEGMENT (symbolP) == bss_seg)
1169 symbolP->sy_frag->fr_symbol = NULL;
1171 symbolP->sy_frag = frag_now;
1172 pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1176 S_SET_SEGMENT (symbolP, bss_seg);
1179 /* The symbol may already have been created with a preceding
1180 ".globl" directive -- be careful not to step on storage class
1181 in that case. Otherwise, set it to static. */
1182 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1184 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1186 #endif /* OBJ_COFF */
1190 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1193 subseg_set (current_seg, current_subseg);
1195 demand_empty_rest_of_line ();
1202 register char *name;
1206 register symbolS *symbolP;
1208 /* we permit ANY defined expression: BSD4.2 demands constants */
1209 name = input_line_pointer;
1210 c = get_symbol_end ();
1211 p = input_line_pointer;
1214 if (*input_line_pointer != ',')
1217 as_bad ("Expected comma after name \"%s\"", name);
1219 ignore_rest_of_line ();
1222 input_line_pointer++;
1224 if (exp.X_op != O_constant
1225 && exp.X_op != O_register)
1227 as_bad ("bad expression");
1228 ignore_rest_of_line ();
1232 symbolP = symbol_find_or_make (name);
1234 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1235 symbolP->sy_desc == 0) out of this test because coff doesn't have
1236 those fields, and I can't see when they'd ever be tripped. I
1237 don't think I understand why they were here so I may have
1238 introduced a bug. As recently as 1.37 didn't have this test
1239 anyway. xoxorich. */
1241 if (S_GET_SEGMENT (symbolP) == undefined_section
1242 && S_GET_VALUE (symbolP) == 0)
1244 /* The name might be an undefined .global symbol; be sure to
1245 keep the "external" bit. */
1246 S_SET_SEGMENT (symbolP,
1247 (exp.X_op == O_constant
1250 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1254 as_bad ("Symbol %s already defined", name);
1257 demand_empty_rest_of_line ();
1264 register segT segment;
1266 register long temp_fill;
1268 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1269 thing as a sub-segment-relative origin. Any absolute origin is
1270 given a warning, then assumed to be segment-relative. Any
1271 segmented origin expression ("foo+42") had better be in the right
1272 segment or the .org is ignored.
1274 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1275 we never know sub-segment sizes when we are reading code. BSD
1276 will crash trying to emit negative numbers of filler bytes in
1277 certain .orgs. We don't crash, but see as-write for that code.
1279 Don't make frag if need_pass_2==1. */
1280 segment = get_known_segmented_expression (&exp);
1281 if (*input_line_pointer == ',')
1283 input_line_pointer++;
1284 temp_fill = get_absolute_expression ();
1290 if (segment != now_seg && segment != absolute_section)
1291 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1292 segment_name (segment), segment_name (now_seg));
1293 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1294 exp.X_add_number, (char *) 0);
1296 } /* if (ok to make frag) */
1297 demand_empty_rest_of_line ();
1304 register char *name;
1305 register char delim;
1306 register char *end_name;
1307 register symbolS *symbolP;
1310 * Especial apologies for the random logic:
1311 * this just grew, and could be parsed much more simply!
1314 name = input_line_pointer;
1315 delim = get_symbol_end ();
1316 end_name = input_line_pointer;
1320 if (*input_line_pointer != ',')
1323 as_bad ("Expected comma after name \"%s\"", name);
1325 ignore_rest_of_line ();
1329 input_line_pointer++;
1332 if (name[0] == '.' && name[1] == '\0')
1334 /* Turn '. = mumble' into a .org mumble */
1335 register segT segment;
1339 segment = get_known_segmented_expression (&exp);
1343 if (segment != now_seg && segment != absolute_section)
1344 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1345 segment_name (segment),
1346 segment_name (now_seg));
1347 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1348 exp.X_add_number, (char *) 0);
1350 } /* if (ok to make frag) */
1356 if ((symbolP = symbol_find (name)) == NULL
1357 && (symbolP = md_undefined_symbol (name)) == NULL)
1359 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1361 /* "set" symbols are local unless otherwise specified. */
1362 SF_SET_LOCAL (symbolP);
1363 #endif /* OBJ_COFF */
1365 } /* make a new symbol */
1367 symbol_table_insert (symbolP);
1370 pseudo_set (symbolP);
1371 demand_empty_rest_of_line ();
1379 register long temp_fill;
1382 /* Just like .fill, but temp_size = 1 */
1383 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1385 temp_fill = get_absolute_expression ();
1389 input_line_pointer--; /* Backup over what was not a ','. */
1394 temp_repeat *= mult;
1396 if (temp_repeat <= 0)
1398 as_warn ("Repeat < 0, .space ignored");
1399 ignore_rest_of_line ();
1404 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1405 temp_repeat, (char *) 0);
1408 demand_empty_rest_of_line ();
1417 temp = get_absolute_expression ();
1418 subseg_set (text_section, (subsegT) temp);
1419 demand_empty_rest_of_line ();
1424 demand_empty_rest_of_line ()
1427 if (is_end_of_line[(unsigned char) *input_line_pointer])
1429 input_line_pointer++;
1433 ignore_rest_of_line ();
1435 /* Return having already swallowed end-of-line. */
1436 } /* Return pointing just after end-of-line. */
1439 ignore_rest_of_line () /* For suspect lines: gives warning. */
1441 if (!is_end_of_line[(unsigned char) *input_line_pointer])
1443 if (isprint (*input_line_pointer))
1444 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1445 *input_line_pointer);
1447 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1448 *input_line_pointer);
1449 while (input_line_pointer < buffer_limit
1450 && !is_end_of_line[(unsigned char) *input_line_pointer])
1452 input_line_pointer++;
1455 input_line_pointer++; /* Return pointing just after end-of-line. */
1456 know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
1462 * In: Pointer to a symbol.
1463 * Input_line_pointer->expression.
1465 * Out: Input_line_pointer->just after any whitespace after expression.
1466 * Tried to set symbol to value of expression.
1467 * Will change symbols type, value, and frag;
1470 pseudo_set (symbolP)
1474 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1476 #endif /* OBJ_AOUT or OBJ_BOUT */
1478 know (symbolP); /* NULL pointer is logic error. */
1479 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1480 /* @@ Fix this right for BFD. */
1481 ext = S_IS_EXTERNAL (symbolP);
1482 #endif /* OBJ_AOUT or OBJ_BOUT */
1484 (void) expression (&exp);
1486 if (exp.X_op == O_illegal)
1487 as_bad ("illegal expression; zero assumed");
1488 else if (exp.X_op == O_absent)
1489 as_bad ("missing expression; zero assumed");
1490 else if (exp.X_op == O_big)
1491 as_bad ("%s number invalid; zero assumed",
1492 exp.X_add_number > 0 ? "bignum" : "floating point");
1493 else if (exp.X_op == O_subtract
1494 && (S_GET_SEGMENT (exp.X_add_symbol)
1495 == S_GET_SEGMENT (exp.X_op_symbol))
1496 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1497 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1499 exp.X_op = O_constant;
1500 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1501 - S_GET_VALUE (exp.X_op_symbol));
1509 exp.X_add_number = 0;
1512 S_SET_SEGMENT (symbolP, absolute_section);
1513 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1514 /* @@ Fix this right for BFD. */
1516 S_SET_EXTERNAL (symbolP);
1518 S_CLEAR_EXTERNAL (symbolP);
1519 #endif /* OBJ_AOUT or OBJ_BOUT */
1520 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1521 symbolP->sy_frag = &zero_address_frag;
1525 S_SET_SEGMENT (symbolP, reg_section);
1526 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1527 symbolP->sy_frag = &zero_address_frag;
1531 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1532 symbolP->sy_value = exp;
1535 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1536 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1537 /* @@ Fix this right for BFD! */
1539 S_SET_EXTERNAL (symbolP);
1541 S_CLEAR_EXTERNAL (symbolP);
1542 #endif /* OBJ_AOUT or OBJ_BOUT */
1543 S_SET_VALUE (symbolP,
1544 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1545 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1550 /* The value is some complex expression.
1551 FIXME: Should we set the segment to anything? */
1552 symbolP->sy_value = exp;
1560 * CONStruct more frag of .bytes, or .words etc.
1561 * Should need_pass_2 be 1 then emit no frag(s).
1562 * This understands EXPRESSIONS.
1566 * This has a split personality. We use expression() to read the
1567 * value. We can detect if the value won't fit in a byte or word.
1568 * But we can't detect if expression() discarded significant digits
1569 * in the case of a long. Not worth the crocks required to fix it.
1572 /* Select a parser for cons expressions. */
1574 /* Some targets need to parse the expression in various fancy ways.
1575 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1576 (for example, the HPPA does this). Otherwise, you can define
1577 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1578 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1579 are defined, which is the normal case, then only simple expressions
1582 #ifndef TC_PARSE_CONS_EXPRESSION
1583 #ifdef BITFIELD_CONS_EXPRESSIONS
1584 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1586 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1589 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1591 parse_mri_cons PARAMS ((expressionS *exp));
1593 #ifdef REPEAT_CONS_EXPRESSIONS
1594 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1596 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1599 /* If we haven't gotten one yet, just call expression. */
1600 #ifndef TC_PARSE_CONS_EXPRESSION
1601 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1605 /* worker to do .byte etc statements */
1606 /* clobbers input_line_pointer, checks */
1610 register int nbytes; /* 1=.byte, 2=.word, 4=.long */
1614 if (is_it_end_of_statement ())
1616 demand_empty_rest_of_line ();
1622 TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
1623 emit_expr (&exp, (unsigned int) nbytes);
1625 while (*input_line_pointer++ == ',');
1627 input_line_pointer--; /* Put terminator back into stream. */
1628 demand_empty_rest_of_line ();
1631 /* Put the contents of expression EXP into the object file using
1632 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1635 emit_expr (exp, nbytes)
1637 unsigned int nbytes;
1641 valueT extra_digit = 0;
1643 /* Don't do anything if we are going to make another pass. */
1649 /* Handle a negative bignum. */
1651 && exp->X_add_number == 0
1652 && exp->X_add_symbol->sy_value.X_op == O_big
1653 && exp->X_add_symbol->sy_value.X_add_number > 0)
1656 unsigned long carry;
1658 exp = &exp->X_add_symbol->sy_value;
1660 /* Negate the bignum: one's complement each digit and add 1. */
1662 for (i = 0; i < exp->X_add_number; i++)
1666 next = (((~ (generic_bignum[i] & LITTLENUM_MASK))
1669 generic_bignum[i] = next & LITTLENUM_MASK;
1670 carry = next >> LITTLENUM_NUMBER_OF_BITS;
1673 /* We can ignore any carry out, because it will be handled by
1674 extra_digit if it is needed. */
1676 extra_digit = (valueT) -1;
1680 if (op == O_absent || op == O_illegal)
1682 as_warn ("zero assumed for missing expression");
1683 exp->X_add_number = 0;
1686 else if (op == O_big && exp->X_add_number <= 0)
1688 as_bad ("floating point number invalid; zero assumed");
1689 exp->X_add_number = 0;
1692 else if (op == O_register)
1694 as_warn ("register value used as expression");
1698 p = frag_more ((int) nbytes);
1700 #ifndef WORKING_DOT_WORD
1701 /* If we have the difference of two symbols in a word, save it on
1702 the broken_words list. See the code in write.c. */
1703 if (op == O_subtract && nbytes == 2)
1705 struct broken_word *x;
1707 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1708 x->next_broken_word = broken_words;
1711 x->word_goes_here = p;
1713 x->add = exp->X_add_symbol;
1714 x->sub = exp->X_op_symbol;
1715 x->addnum = exp->X_add_number;
1722 /* If we have an integer, but the number of bytes is too large to
1723 pass to md_number_to_chars, handle it as a bignum. */
1724 if (op == O_constant && nbytes > sizeof (valueT))
1729 if (! exp->X_unsigned && exp->X_add_number < 0)
1730 extra_digit = (valueT) -1;
1731 val = (valueT) exp->X_add_number;
1735 generic_bignum[gencnt] = val & LITTLENUM_MASK;
1736 val >>= LITTLENUM_NUMBER_OF_BITS;
1740 op = exp->X_op = O_big;
1741 exp->X_add_number = gencnt;
1744 if (op == O_constant)
1746 register valueT get;
1747 register valueT use;
1748 register valueT mask;
1749 register valueT unmask;
1751 /* JF << of >= number of bits in the object is undefined. In
1752 particular SPARC (Sun 4) has problems */
1753 if (nbytes >= sizeof (valueT))
1756 mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1758 unmask = ~mask; /* Do store these bits. */
1761 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1762 mask = ~(unmask >> 1); /* Includes sign bit now. */
1765 get = exp->X_add_number;
1767 if ((get & mask) != 0 && (get & mask) != mask)
1768 { /* Leading bits contain both 0s & 1s. */
1769 as_warn ("Value 0x%lx truncated to 0x%lx.", get, use);
1771 /* put bytes in right order. */
1772 md_number_to_chars (p, use, (int) nbytes);
1774 else if (op == O_big)
1777 LITTLENUM_TYPE *nums;
1779 know (nbytes % CHARS_PER_LITTLENUM == 0);
1781 size = exp->X_add_number * CHARS_PER_LITTLENUM;
1784 as_warn ("Bignum truncated to %d bytes", nbytes);
1788 if (target_big_endian)
1790 while (nbytes > size)
1792 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1793 nbytes -= CHARS_PER_LITTLENUM;
1794 p += CHARS_PER_LITTLENUM;
1797 nums = generic_bignum + size / CHARS_PER_LITTLENUM;
1801 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1802 size -= CHARS_PER_LITTLENUM;
1803 p += CHARS_PER_LITTLENUM;
1808 nums = generic_bignum;
1811 md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
1813 size -= CHARS_PER_LITTLENUM;
1814 p += CHARS_PER_LITTLENUM;
1815 nbytes -= CHARS_PER_LITTLENUM;
1820 md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
1821 nbytes -= CHARS_PER_LITTLENUM;
1822 p += CHARS_PER_LITTLENUM;
1828 md_number_to_chars (p, (valueT) 0, (int) nbytes);
1830 /* Now we need to generate a fixS to record the symbol value.
1831 This is easy for BFD. For other targets it can be more
1832 complex. For very complex cases (currently, the HPPA and
1833 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1834 want. For simpler cases, you can define TC_CONS_RELOC to be
1835 the name of the reloc code that should be stored in the fixS.
1836 If neither is defined, the code uses NO_RELOC if it is
1837 defined, and otherwise uses 0. */
1839 #ifdef BFD_ASSEMBLER
1840 #ifdef TC_CONS_FIX_NEW
1841 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1843 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1844 /* @@ Should look at CPU word size. */
1845 nbytes == 2 ? BFD_RELOC_16
1846 : nbytes == 8 ? BFD_RELOC_64
1850 #ifdef TC_CONS_FIX_NEW
1851 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1853 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1854 it is defined, otherwise use NO_RELOC if it is defined,
1856 #ifndef TC_CONS_RELOC
1858 #define TC_CONS_RELOC NO_RELOC
1860 #define TC_CONS_RELOC 0
1863 fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
1865 #endif /* TC_CONS_FIX_NEW */
1866 #endif /* BFD_ASSEMBLER */
1870 #ifdef BITFIELD_CONS_EXPRESSIONS
1872 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1873 w:x,y:z, where w and y are bitwidths and x and y are values. They
1874 then pack them all together. We do a little better in that we allow
1875 them in words, longs, etc. and we'll pack them in target byte order
1878 The rules are: pack least significat bit first, if a field doesn't
1879 entirely fit, put it in the next unit. Overflowing the bitfield is
1880 explicitly *not* even a warning. The bitwidth should be considered
1883 To use this function the tc-XXX.h file should define
1884 BITFIELD_CONS_EXPRESSIONS. */
1887 parse_bitfield_cons (exp, nbytes)
1889 unsigned int nbytes;
1891 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1892 char *hold = input_line_pointer;
1894 (void) expression (exp);
1896 if (*input_line_pointer == ':')
1902 unsigned long width;
1904 if (*input_line_pointer != ':')
1906 input_line_pointer = hold;
1908 } /* next piece is not a bitfield */
1910 /* In the general case, we can't allow
1911 full expressions with symbol
1912 differences and such. The relocation
1913 entries for symbols not defined in this
1914 assembly would require arbitrary field
1915 widths, positions, and masks which most
1916 of our current object formats don't
1919 In the specific case where a symbol
1920 *is* defined in this assembly, we
1921 *could* build fixups and track it, but
1922 this could lead to confusion for the
1923 backends. I'm lazy. I'll take any
1924 SEG_ABSOLUTE. I think that means that
1925 you can use a previous .set or
1926 .equ type symbol. xoxorich. */
1928 if (exp->X_op == O_absent)
1930 as_warn ("using a bit field width of zero");
1931 exp->X_add_number = 0;
1932 exp->X_op = O_constant;
1933 } /* implied zero width bitfield */
1935 if (exp->X_op != O_constant)
1937 *input_line_pointer = '\0';
1938 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1939 *input_line_pointer = ':';
1940 demand_empty_rest_of_line ();
1944 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1946 as_warn ("field width %lu too big to fit in %d bytes: truncated to %d bits",
1947 width, nbytes, (BITS_PER_CHAR * nbytes));
1948 width = BITS_PER_CHAR * nbytes;
1951 if (width > bits_available)
1953 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1954 input_line_pointer = hold;
1955 exp->X_add_number = value;
1959 hold = ++input_line_pointer; /* skip ':' */
1961 (void) expression (exp);
1962 if (exp->X_op != O_constant)
1964 char cache = *input_line_pointer;
1966 *input_line_pointer = '\0';
1967 as_bad ("field value \"%s\" too complex for a bitfield", hold);
1968 *input_line_pointer = cache;
1969 demand_empty_rest_of_line ();
1973 value |= ((~(-1 << width) & exp->X_add_number)
1974 << ((BITS_PER_CHAR * nbytes) - bits_available));
1976 if ((bits_available -= width) == 0
1977 || is_it_end_of_statement ()
1978 || *input_line_pointer != ',')
1981 } /* all the bitfields we're gonna get */
1983 hold = ++input_line_pointer;
1984 (void) expression (exp);
1985 } /* forever loop */
1987 exp->X_add_number = value;
1988 exp->X_op = O_constant;
1989 exp->X_unsigned = 1;
1990 } /* if looks like a bitfield */
1991 } /* parse_bitfield_cons() */
1993 #endif /* BITFIELD_CONS_EXPRESSIONS */
1998 parse_mri_cons (exp, nbytes)
2000 unsigned int nbytes;
2002 if (*input_line_pointer == '\'')
2004 /* An MRI style string, cut into as many bytes as will fit into
2005 a nbyte chunk, left justify if necessary, and separate with
2006 commas so we can try again later */
2008 unsigned int result = 0;
2009 input_line_pointer++;
2010 for (scan = 0; scan < nbytes; scan++)
2012 if (*input_line_pointer == '\'')
2014 if (input_line_pointer[1] == '\'')
2016 input_line_pointer++;
2021 result = (result << 8) | (*input_line_pointer++);
2025 while (scan < nbytes)
2030 /* Create correct expression */
2031 exp->X_op = O_constant;
2032 exp->X_add_number = result;
2033 /* Fake it so that we can read the next char too */
2034 if (input_line_pointer[0] != '\'' ||
2035 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
2037 input_line_pointer -= 2;
2038 input_line_pointer[0] = ',';
2039 input_line_pointer[1] = '\'';
2042 input_line_pointer++;
2050 #ifdef REPEAT_CONS_EXPRESSIONS
2052 /* Parse a repeat expression for cons. This is used by the MIPS
2053 assembler. The format is NUMBER:COUNT; NUMBER appears in the
2054 object file COUNT times.
2056 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
2059 parse_repeat_cons (exp, nbytes)
2061 unsigned int nbytes;
2068 if (*input_line_pointer != ':')
2070 /* No repeat count. */
2074 ++input_line_pointer;
2075 expression (&count);
2076 if (count.X_op != O_constant
2077 || count.X_add_number <= 0)
2079 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2083 /* The cons function is going to output this expression once. So we
2084 output it count - 1 times. */
2085 for (i = count.X_add_number - 1; i > 0; i--)
2086 emit_expr (exp, nbytes);
2089 #endif /* REPEAT_CONS_EXPRESSIONS */
2094 * CONStruct some more frag chars of .floats .ffloats etc.
2095 * Makes 0 or more new frags.
2096 * If need_pass_2 == 1, no frags are emitted.
2097 * This understands only floating literals, not expressions. Sorry.
2099 * A floating constant is defined by atof_generic(), except it is preceded
2100 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2101 * reading, I decided to be incompatible. This always tries to give you
2102 * rounded bits to the precision of the pseudo-op. Former AS did premature
2103 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2104 * a choice of 2 flavours of noise according to which of 2 floating-point
2105 * scanners you directed AS to use.
2107 * In: input_line_pointer->whitespace before, or '0' of flonum.
2112 float_cons (float_type)
2113 /* Clobbers input_line-pointer, checks end-of-line. */
2114 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2117 int length; /* Number of chars in an object. */
2118 register char *err; /* Error from scanning floating literal. */
2119 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2121 if (is_it_end_of_statement ())
2123 demand_empty_rest_of_line ();
2129 /* input_line_pointer->1st char of a flonum (we hope!). */
2132 /* Skip any 0{letter} that may be present. Don't even check if the
2133 * letter is legal. Someone may invent a "z" format and this routine
2134 * has no use for such information. Lusers beware: you get
2135 * diagnostics if your input is ill-conditioned.
2137 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2138 input_line_pointer += 2;
2140 err = md_atof (float_type, temp, &length);
2141 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2145 as_bad ("Bad floating literal: %s", err);
2146 ignore_rest_of_line ();
2156 #ifdef REPEAT_CONS_EXPRESSIONS
2157 if (*input_line_pointer == ':')
2159 expressionS count_exp;
2161 ++input_line_pointer;
2162 expression (&count_exp);
2163 if (count_exp.X_op != O_constant
2164 || count_exp.X_add_number <= 0)
2166 as_warn ("unresolvable or nonpositive repeat count; using 1");
2169 count = count_exp.X_add_number;
2173 while (--count >= 0)
2175 p = frag_more (length);
2176 memcpy (p, temp, (unsigned int) length);
2181 while (*input_line_pointer++ == ',');
2183 --input_line_pointer; /* Put terminator back into stream. */
2184 demand_empty_rest_of_line ();
2185 } /* float_cons() */
2190 * We read 0 or more ',' seperated, double-quoted strings.
2192 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2197 stringer (append_zero) /* Worker to do .ascii etc statements. */
2198 /* Checks end-of-line. */
2199 register int append_zero; /* 0: don't append '\0', else 1 */
2201 register unsigned int c;
2204 * The following awkward logic is to parse ZERO or more strings,
2205 * comma seperated. Recall a string expression includes spaces
2206 * before the opening '\"' and spaces after the closing '\"'.
2207 * We fake a leading ',' if there is (supposed to be)
2208 * a 1st, expression. We keep demanding expressions for each
2211 if (is_it_end_of_statement ())
2213 c = 0; /* Skip loop. */
2214 ++input_line_pointer; /* Compensate for end of loop. */
2218 c = ','; /* Do loop. */
2220 while (c == ',' || c == '<' || c == '"')
2223 switch (*input_line_pointer)
2226 ++input_line_pointer; /*->1st char of string. */
2227 while (is_a_char (c = next_char_of_string ()))
2229 FRAG_APPEND_1_CHAR (c);
2233 FRAG_APPEND_1_CHAR (0);
2235 know (input_line_pointer[-1] == '\"');
2238 input_line_pointer++;
2239 c = get_single_number ();
2240 FRAG_APPEND_1_CHAR (c);
2241 if (*input_line_pointer != '>')
2243 as_bad ("Expected <nn>");
2245 input_line_pointer++;
2248 input_line_pointer++;
2252 c = *input_line_pointer;
2255 demand_empty_rest_of_line ();
2258 /* FIXME-SOMEDAY: I had trouble here on characters with the
2259 high bits set. We'll probably also have trouble with
2260 multibyte chars, wide chars, etc. Also be careful about
2261 returning values bigger than 1 byte. xoxorich. */
2264 next_char_of_string ()
2266 register unsigned int c;
2268 c = *input_line_pointer++ & CHAR_MASK;
2276 switch (c = *input_line_pointer++)
2306 break; /* As itself. */
2322 for (i = 0, number = 0; isdigit (c) && i < 3; c = *input_line_pointer++, i++)
2324 number = number * 8 + c - '0';
2328 --input_line_pointer;
2337 c = *input_line_pointer++;
2338 while (isxdigit (c))
2341 number = number * 16 + c - '0';
2342 else if (isupper (c))
2343 number = number * 16 + c - 'A' + 10;
2345 number = number * 16 + c - 'a' + 10;
2346 c = *input_line_pointer++;
2349 --input_line_pointer;
2354 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2355 as_warn ("Unterminated string: Newline inserted.");
2361 #ifdef ONLY_STANDARD_ESCAPES
2362 as_bad ("Bad escaped character in string, '?' assumed");
2364 #endif /* ONLY_STANDARD_ESCAPES */
2367 } /* switch on escaped char */
2372 } /* switch on char */
2374 } /* next_char_of_string() */
2377 get_segmented_expression (expP)
2378 register expressionS *expP;
2380 register segT retval;
2382 retval = expression (expP);
2383 if (expP->X_op == O_illegal
2384 || expP->X_op == O_absent
2385 || expP->X_op == O_big)
2387 as_bad ("expected address expression; zero assumed");
2388 expP->X_op = O_constant;
2389 expP->X_add_number = 0;
2390 retval = absolute_section;
2396 get_known_segmented_expression (expP)
2397 register expressionS *expP;
2399 register segT retval;
2401 if ((retval = get_segmented_expression (expP)) == undefined_section)
2403 /* There is no easy way to extract the undefined symbol from the
2405 if (expP->X_add_symbol != NULL
2406 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2407 as_warn ("symbol \"%s\" undefined; zero assumed",
2408 S_GET_NAME (expP->X_add_symbol));
2410 as_warn ("some symbol undefined; zero assumed");
2411 retval = absolute_section;
2412 expP->X_op = O_constant;
2413 expP->X_add_number = 0;
2415 know (retval == absolute_section || SEG_NORMAL (retval));
2417 } /* get_known_segmented_expression() */
2420 get_absolute_expression ()
2425 if (exp.X_op != O_constant)
2427 if (exp.X_op != O_absent)
2428 as_bad ("bad absolute expression; zero assumed");
2429 exp.X_add_number = 0;
2431 return exp.X_add_number;
2434 char /* return terminator */
2435 get_absolute_expression_and_terminator (val_pointer)
2436 long *val_pointer; /* return value of expression */
2438 /* FIXME: val_pointer should probably be offsetT *. */
2439 *val_pointer = (long) get_absolute_expression ();
2440 return (*input_line_pointer++);
2444 * demand_copy_C_string()
2446 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2447 * Give a warning if that happens.
2450 demand_copy_C_string (len_pointer)
2455 if ((s = demand_copy_string (len_pointer)) != 0)
2459 for (len = *len_pointer;
2468 as_bad ("This string may not contain \'\\0\'");
2476 * demand_copy_string()
2478 * Demand string, but return a safe (=private) copy of the string.
2479 * Return NULL if we can't read a string here.
2482 demand_copy_string (lenP)
2485 register unsigned int c;
2491 if (*input_line_pointer == '\"')
2493 input_line_pointer++; /* Skip opening quote. */
2495 while (is_a_char (c = next_char_of_string ()))
2497 obstack_1grow (¬es, c);
2500 /* JF this next line is so demand_copy_C_string will return a null
2501 termanated string. */
2502 obstack_1grow (¬es, '\0');
2503 retval = obstack_finish (¬es);
2507 as_warn ("Missing string");
2509 ignore_rest_of_line ();
2513 } /* demand_copy_string() */
2516 * is_it_end_of_statement()
2518 * In: Input_line_pointer->next character.
2520 * Do: Skip input_line_pointer over all whitespace.
2522 * Out: 1 if input_line_pointer->end-of-line.
2525 is_it_end_of_statement ()
2528 return (is_end_of_line[(unsigned char) *input_line_pointer]);
2529 } /* is_it_end_of_statement() */
2535 register symbolS *symbolP; /* symbol we are working with */
2537 input_line_pointer++;
2538 if (*input_line_pointer == '=')
2539 input_line_pointer++;
2541 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2542 input_line_pointer++;
2544 if (sym_name[0] == '.' && sym_name[1] == '\0')
2546 /* Turn '. = mumble' into a .org mumble */
2547 register segT segment;
2551 segment = get_known_segmented_expression (&exp);
2554 if (segment != now_seg && segment != absolute_section)
2555 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2556 segment_name (segment),
2557 segment_name (now_seg));
2558 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2559 exp.X_add_number, (char *) 0);
2561 } /* if (ok to make frag) */
2565 symbolP = symbol_find_or_make (sym_name);
2566 pseudo_set (symbolP);
2570 /* .include -- include a file at this point. */
2583 filename = demand_copy_string (&i);
2584 demand_empty_rest_of_line ();
2585 path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
2586 for (i = 0; i < include_dir_count; i++)
2588 strcpy (path, include_dirs[i]);
2590 strcat (path, filename);
2591 if (0 != (try = fopen (path, FOPEN_RT)))
2600 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2601 newbuf = input_scrub_include_file (path, input_line_pointer);
2602 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2606 add_include_dir (path)
2611 if (include_dir_count == 0)
2613 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2614 include_dirs[0] = "."; /* Current dir */
2615 include_dir_count = 2;
2619 include_dir_count++;
2620 include_dirs = (char **) realloc (include_dirs,
2621 include_dir_count * sizeof (*include_dirs));
2624 include_dirs[include_dir_count - 1] = path; /* New one */
2627 if (i > include_dir_maxlen)
2628 include_dir_maxlen = i;
2629 } /* add_include_dir() */
2635 while (!is_end_of_line[(unsigned char) *input_line_pointer])
2637 ++input_line_pointer;
2639 ++input_line_pointer;