1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991 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!)! */
71 /* used by is_... macros. our ctype[] */
72 const char lex_type[256] =
74 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
75 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
76 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
77 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
78 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
79 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
80 0, 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, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
82 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
83 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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,
94 * Out: 1 if this character ends a line.
97 char is_end_of_line[256] =
100 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
102 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
104 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
106 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
107 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
109 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
110 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
112 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
113 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
114 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
115 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
116 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
117 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
118 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
124 /* Functions private to this file. */
126 static char *buffer; /* 1st char of each buffer of lines is here. */
127 static char *buffer_limit; /*->1 + last char in buffer. */
129 static char *bignum_low; /* Lowest char of bignum. */
130 static char *bignum_limit; /* 1st illegal address of bignum. */
131 static char *bignum_high; /* Highest char of bignum. */
132 /* May point to (bignum_start-1). */
133 /* Never >= bignum_limit. */
135 int target_big_endian;
137 static char *old_buffer; /* JF a hack */
138 static char *old_input;
139 static char *old_limit;
141 /* Variables for handling include file directory list. */
143 char **include_dirs; /* List of pointers to directories to
144 search for .include's */
145 int include_dir_count; /* How many are in the list */
146 int include_dir_maxlen = 1;/* Length of longest in list */
148 #ifndef WORKING_DOT_WORD
149 struct broken_word *broken_words;
150 int new_broken_words;
153 static char *demand_copy_string PARAMS ((int *lenP));
154 int is_it_end_of_statement PARAMS ((void));
155 unsigned int next_char_of_string PARAMS ((void));
156 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
157 static void grow_bignum PARAMS ((void));
158 static void pobegin PARAMS ((void));
169 obj_read_begin_hook ();
171 obstack_begin (¬es, 5000);
172 obstack_begin (&cond_obstack, 960);
174 #define BIGNUM_BEGIN_SIZE (16)
175 bignum_low = xmalloc ((long) BIGNUM_BEGIN_SIZE);
176 bignum_limit = bignum_low + BIGNUM_BEGIN_SIZE;
178 /* Use machine dependent syntax */
179 for (p = line_separator_chars; *p; p++)
180 is_end_of_line[*p] = 1;
181 /* Use more. FIXME-SOMEDAY. */
184 /* set up pseudo-op tables */
186 struct hash_control *po_hash;
188 static const pseudo_typeS potable[] =
190 {"abort", s_abort, 0},
191 {"align", s_align_ptwo, 0},
192 {"ascii", stringer, 0},
193 {"asciz", stringer, 1},
199 {"double", float_cons, 'd'},
201 {"eject", listing_eject, 0}, /* Formfeed listing */
204 {"endif", s_endif, 0},
209 {"extern", s_ignore, 0}, /* We treat all undef as ext */
210 {"appfile", s_app_file, 1},
211 {"appline", s_app_line, 0},
212 {"file", s_app_file, 0},
214 {"float", float_cons, 'f'},
215 {"global", s_globl, 0},
216 {"globl", s_globl, 0},
219 {"ifdef", s_ifdef, 0},
220 {"ifeqs", s_ifeqs, 0},
221 {"ifndef", s_ifdef, 1},
222 {"ifnes", s_ifeqs, 1},
223 {"ifnotdef", s_ifdef, 1},
224 {"include", s_include, 0},
226 {"lcomm", s_lcomm, 0},
227 {"lflags", listing_flags, 0}, /* Listing flags */
228 {"list", listing_list, 1}, /* Turn listing on */
231 {"nolist", listing_list, 0}, /* Turn listing off */
232 {"octa", big_cons, 16},
234 {"psize", listing_psize, 0}, /* set paper size */
236 {"quad", big_cons, 8},
237 {"sbttl", listing_title, 1}, /* Subtitle of listing */
242 {"single", float_cons, 'f'},
244 {"space", s_space, 0},
247 {"title", listing_title, 0}, /* Listing title */
252 {NULL} /* end sentinel */
258 char *errtxt; /* error text */
259 const pseudo_typeS *pop;
261 po_hash = hash_new ();
263 /* Do the target-specific pseudo ops. */
264 for (pop = md_pseudo_table; pop->poc_name; pop++)
266 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
267 if (errtxt && *errtxt)
269 as_fatal ("error constructing md pseudo-op table");
273 /* Now object specific. Skip any that were in the target table. */
274 for (pop = obj_pseudo_table; pop->poc_name; pop++)
276 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
277 if (errtxt && *errtxt)
279 if (!strcmp (errtxt, "exists"))
281 #ifdef DIE_ON_OVERRIDES
282 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
283 #endif /* DIE_ON_OVERRIDES */
284 continue; /* OK if target table overrides. */
288 as_fatal ("error constructing obj pseudo-op table");
289 } /* if overridden */
293 /* Now portable ones. Skip any that we've seen already. */
294 for (pop = potable; pop->poc_name; pop++)
296 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
297 if (errtxt && *errtxt)
299 if (!strcmp (errtxt, "exists"))
301 #ifdef DIE_ON_OVERRIDES
302 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
303 #endif /* DIE_ON_OVERRIDES */
304 continue; /* OK if target table overrides. */
308 as_fatal ("error constructing obj pseudo-op table");
309 } /* if overridden */
316 #define HANDLE_CONDITIONAL_ASSEMBLY() \
317 if (ignore_input ()) \
319 while (! is_end_of_line[*input_line_pointer++]) \
320 if (input_line_pointer == buffer_limit) \
326 /* read_a_source_file()
328 * We read the file, putting things into a web that
329 * represents what we have been reading.
332 read_a_source_file (name)
336 register char *s; /* string of symbol, '\0' appended */
340 buffer = input_scrub_new_file (name);
343 listing_newline ("");
345 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
346 { /* We have another line to parse. */
347 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
348 contin: /* JF this goto is my fault I admit it.
349 Someone brave please re-write the whole
350 input section here? Pleeze??? */
351 while (input_line_pointer < buffer_limit)
353 /* We have more of this buffer to parse. */
356 * We now have input_line_pointer->1st char of next line.
357 * If input_line_pointer [-1] == '\n' then we just
358 * scanned another line: so bump line counters.
360 if (input_line_pointer[-1] == '\n')
362 bump_line_counters ();
365 /* Text at the start of a line must be a label, we run down and stick a colon in */
366 if (is_name_beginner (*input_line_pointer))
368 char *line_start = input_line_pointer;
369 char c = get_symbol_end ();
371 *input_line_pointer = c;
373 input_line_pointer++;
381 * We are at the begining of a line, or similar place.
382 * We expect a well-formed assembler statement.
383 * A "symbol-name:" is a statement.
385 * Depending on what compiler is used, the order of these tests
386 * may vary to catch most common case 1st.
387 * Each test is independent of all other tests at the (top) level.
388 * PLEASE make a compiler that doesn't use this assembler.
389 * It is crufty to waste a compiler's time encoding things for this
390 * assembler, which then wastes more time decoding it.
391 * (And communicating via (linear) files is silly!
392 * If you must pass stuff, please pass a tree!)
394 if ((c = *input_line_pointer++) == '\t'
399 c = *input_line_pointer++;
401 know (c != ' '); /* No further leading whitespace. */
404 * C is the 1st significant character.
405 * Input_line_pointer points after that character.
407 if (is_name_beginner (c))
408 { /* want user-defined label or pseudo/opcode */
409 HANDLE_CONDITIONAL_ASSEMBLY ();
411 s = --input_line_pointer;
412 c = get_symbol_end (); /* name's delimiter */
414 * C is character after symbol.
415 * That character's place in the input line is now '\0'.
416 * S points to the beginning of the symbol.
417 * [In case of pseudo-op, s->'.'.]
418 * Input_line_pointer->'\0' where c was.
420 if (TC_START_LABEL(c, input_line_pointer))
422 colon (s); /* user-defined label */
423 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
424 /* Input_line_pointer->after ':'. */
429 else if (c == '=' || input_line_pointer[1] == '=')
432 demand_empty_rest_of_line ();
435 { /* expect pseudo-op or machine instruction */
437 if (!done_pseudo (s))
445 * WARNING: c has next char, which may be end-of-line.
446 * We lookup the pseudo-op table with s+1 because we
447 * already know that the pseudo-op begins with a '.'.
450 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
452 /* Print the error msg now, while we still can */
455 as_bad ("Unknown pseudo-op: `%s'", s);
456 *input_line_pointer = c;
461 /* Put it back for error messages etc. */
462 *input_line_pointer = c;
463 /* The following skip of whitespace is compulsory.
464 A well shaped space is sometimes all that separates
465 keyword from operands. */
466 if (c == ' ' || c == '\t')
468 input_line_pointer++;
469 } /* Skip seperator after keyword. */
471 * Input_line is restored.
472 * Input_line_pointer->1st non-blank char
473 * after pseudo-operation.
477 ignore_rest_of_line ();
482 (*pop->poc_handler) (pop->poc_val);
483 } /* if we have one */
487 { /* machine instruction */
488 /* WARNING: c has char, which may be end-of-line. */
489 /* Also: input_line_pointer->`\0` where c was. */
490 *input_line_pointer = c;
491 while (!is_end_of_line[*input_line_pointer])
493 input_line_pointer++;
496 c = *input_line_pointer;
497 *input_line_pointer = '\0';
499 md_assemble (s); /* Assemble 1 instruction. */
501 *input_line_pointer++ = c;
503 /* We resume loop AFTER the end-of-line from this instruction */
508 } /* if (is_name_beginner(c) */
511 if (is_end_of_line[c])
514 } /* empty statement */
517 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
519 { /* local label ("4:") */
520 char *backup = input_line_pointer;
522 HANDLE_CONDITIONAL_ASSEMBLY ();
526 while (isdigit (*input_line_pointer))
528 temp = (temp * 10) + *input_line_pointer - '0';
529 ++input_line_pointer;
530 } /* read the whole number */
532 #ifdef LOCAL_LABELS_DOLLAR
533 if (*input_line_pointer == '$'
534 && *(input_line_pointer + 1) == ':')
536 input_line_pointer += 2;
538 if (dollar_label_defined (temp))
540 as_fatal ("label \"%d$\" redefined", temp);
543 define_dollar_label (temp);
544 colon (dollar_label_name (temp, 0));
547 #endif /* LOCAL_LABELS_DOLLAR */
549 #ifdef LOCAL_LABELS_FB
550 if (*input_line_pointer++ == ':')
552 fb_label_instance_inc (temp);
553 colon (fb_label_name (temp, 0));
556 #endif /* LOCAL_LABELS_FB */
558 input_line_pointer = backup;
559 } /* local label ("4:") */
560 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
562 if (c && strchr (line_comment_chars, c))
563 { /* Its a comment. Better say APP or NO_APP */
569 extern char *scrub_string, *scrub_last_string;
571 bump_line_counters ();
572 s = input_line_pointer;
573 if (strncmp (s, "APP\n", 4))
574 continue; /* We ignore it */
577 ends = strstr (s, "#NO_APP\n");
584 /* The end of the #APP wasn't in this buffer. We
585 keep reading in buffers until we find the #NO_APP
586 that goes with this #APP There is one. The specs
588 tmp_len = buffer_limit - s;
589 tmp_buf = xmalloc (tmp_len + 1);
590 bcopy (s, tmp_buf, tmp_len);
593 new_tmp = input_scrub_next_buffer (&buffer);
597 buffer_limit = new_tmp;
598 input_line_pointer = buffer;
599 ends = strstr (buffer, "#NO_APP\n");
603 num = buffer_limit - buffer;
605 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
606 bcopy (buffer, tmp_buf + tmp_len, num);
611 input_line_pointer = ends ? ends + 8 : NULL;
619 input_line_pointer = ends + 8;
621 new_buf = xmalloc (100);
626 scrub_last_string = ends;
631 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
635 if (new_tmp == new_buf + new_length)
637 new_buf = xrealloc (new_buf, new_length + 100);
638 new_tmp = new_buf + new_length;
646 old_input = input_line_pointer;
647 old_limit = buffer_limit;
649 input_line_pointer = new_buf;
650 buffer_limit = new_tmp;
654 HANDLE_CONDITIONAL_ASSEMBLY ();
656 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
657 input_line_pointer--; /* Report unknown char as ignored. */
658 ignore_rest_of_line ();
659 } /* while (input_line_pointer<buffer_limit) */
662 bump_line_counters ();
666 input_line_pointer = old_input;
667 buffer_limit = old_limit;
672 } /* while (more buffers to scan) */
673 input_scrub_close (); /* Close the input file */
675 } /* read_a_source_file() */
680 as_fatal (".abort detected. Abandoning ship.");
683 /* For machines where ".align 4" means align to a 4 byte boundary. */
688 register unsigned int temp;
689 register long temp_fill;
691 unsigned long max_alignment = 1 << 15;
693 if (is_end_of_line[*input_line_pointer])
694 temp = arg; /* Default value from pseudo-op table */
696 temp = get_absolute_expression ();
698 if (temp > max_alignment)
700 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
704 * For the sparc, `.align (1<<n)' actually means `.align n'
705 * so we have to convert it.
709 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
713 as_bad ("Alignment not a power of 2");
716 if (*input_line_pointer == ',')
718 input_line_pointer++;
719 temp_fill = get_absolute_expression ();
721 else if (now_seg != data_section && now_seg != bss_section)
722 temp_fill = NOP_OPCODE;
725 /* Only make a frag if we HAVE to. . . */
726 if (temp && !need_pass_2)
727 frag_align (temp, (int) temp_fill);
729 record_alignment (now_seg, temp);
731 demand_empty_rest_of_line ();
732 } /* s_align_bytes() */
734 /* For machines where ".align 4" means align to 2**4 boundary. */
739 register long temp_fill;
740 long max_alignment = 15;
742 temp = get_absolute_expression ();
743 if (temp > max_alignment)
744 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
747 as_bad ("Alignment negative. 0 assumed.");
750 if (*input_line_pointer == ',')
752 input_line_pointer++;
753 temp_fill = get_absolute_expression ();
755 /* @@ Fix this right for BFD! */
756 else if (now_seg != data_section && now_seg != bss_section)
757 temp_fill = NOP_OPCODE;
760 /* Only make a frag if we HAVE to. . . */
761 if (temp && !need_pass_2)
762 frag_align (temp, (int) temp_fill);
764 record_alignment (now_seg, temp);
766 demand_empty_rest_of_line ();
767 } /* s_align_ptwo() */
776 register symbolS *symbolP;
778 name = input_line_pointer;
779 c = get_symbol_end ();
780 /* just after name is now '\0' */
781 p = input_line_pointer;
784 if (*input_line_pointer != ',')
786 as_bad ("Expected comma after symbol-name: rest of line ignored.");
787 ignore_rest_of_line ();
790 input_line_pointer++; /* skip ',' */
791 if ((temp = get_absolute_expression ()) < 0)
793 as_warn (".COMMon length (%d.) <0! Ignored.", temp);
794 ignore_rest_of_line ();
798 symbolP = symbol_find_or_make (name);
800 if (S_IS_DEFINED (symbolP))
802 as_bad ("Ignoring attempt to re-define symbol");
803 ignore_rest_of_line ();
806 if (S_GET_VALUE (symbolP))
808 if (S_GET_VALUE (symbolP) != temp)
809 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
810 S_GET_NAME (symbolP),
811 S_GET_VALUE (symbolP),
816 S_SET_VALUE (symbolP, temp);
817 S_SET_EXTERNAL (symbolP);
820 if ( (!temp) || !flagseen['1'])
821 S_GET_OTHER(symbolP) = const_flag;
822 #endif /* not OBJ_VMS */
823 know (symbolP->sy_frag == &zero_address_frag);
824 demand_empty_rest_of_line ();
832 temp = get_absolute_expression ();
834 subseg_set (data_section, (subsegT) temp);
836 subseg_new (data_section, (subsegT) temp);
842 demand_empty_rest_of_line ();
845 /* Handle the .appfile pseudo-op. This is automatically generated by
846 do_scrub_next_char when a preprocessor # line comment is seen with
847 a file name. This default definition may be overridden by the
848 object or CPU specific pseudo-ops. This function is also the
849 default definition for .file; the APPFILE argument is 1 for
850 .appfile, 0 for .file. */
859 /* Some assemblers tolerate immediately following '"' */
860 if ((s = demand_copy_string (&length)) != 0)
862 /* If this is a fake .appfile, a fake newline was inserted into
863 the buffer. Passing -2 to new_logical_line tells it to
865 new_logical_line (s, appfile ? -2 : -1);
866 demand_empty_rest_of_line ();
869 listing_source_file (s);
873 c_dot_file_symbol (s);
874 #endif /* OBJ_COFF */
880 /* Handle the .appline pseudo-op. This is automatically generated by
881 do_scrub_next_char when a preprocessor # line comment is seen.
882 This default definition may be overridden by the object or CPU
883 specific pseudo-ops. */
890 /* The given number is that of the next line. */
891 l = get_absolute_expression () - 1;
892 new_logical_line ((char *) NULL, l);
895 listing_source_line (l);
897 demand_empty_rest_of_line ();
903 long temp_repeat = 0;
905 register long temp_fill = 0;
909 temp_repeat = get_absolute_expression ();
910 if (*input_line_pointer == ',')
912 input_line_pointer++;
913 temp_size = get_absolute_expression ();
914 if (*input_line_pointer == ',')
916 input_line_pointer++;
917 temp_fill = get_absolute_expression ();
920 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
921 #define BSD_FILL_SIZE_CROCK_8 (8)
922 if (temp_size > BSD_FILL_SIZE_CROCK_8)
924 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
925 temp_size = BSD_FILL_SIZE_CROCK_8;
929 as_warn ("Size negative: .fill ignored.");
932 else if (temp_repeat <= 0)
934 as_warn ("Repeat < 0, .fill ignored");
938 if (temp_size && !need_pass_2)
940 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
941 memset (p, 0, (int) temp_size);
942 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
943 * flavoured AS. The following bizzare behaviour is to be
944 * compatible with above. I guess they tried to take up to 8
945 * bytes from a 4-byte expression and they forgot to sign
946 * extend. Un*x Sux. */
947 #define BSD_FILL_SIZE_CROCK_4 (4)
948 md_number_to_chars (p, temp_fill,
949 (temp_size > BSD_FILL_SIZE_CROCK_4
950 ? BSD_FILL_SIZE_CROCK_4
952 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
953 * but emits no error message because it seems a legal thing to do.
954 * It is a degenerate case of .fill but could be emitted by a compiler.
957 demand_empty_rest_of_line ();
969 name = input_line_pointer;
970 c = get_symbol_end ();
971 symbolP = symbol_find_or_make (name);
972 *input_line_pointer = c;
974 S_SET_EXTERNAL (symbolP);
977 input_line_pointer++;
979 if (*input_line_pointer == '\n')
984 demand_empty_rest_of_line ();
988 s_lcomm (needs_align)
989 /* 1 if this was a ".bss" directive, which may require a 3rd argument
990 (alignment); 0 if it was an ".lcomm" (2 args only) */
997 register symbolS *symbolP;
998 segT current_seg = now_seg;
999 subsegT current_subseg = now_subseg;
1000 const int max_alignment = 15;
1002 segT bss_seg = bss_section;
1004 name = input_line_pointer;
1005 c = get_symbol_end ();
1006 p = input_line_pointer;
1009 if (*input_line_pointer != ',')
1011 as_bad ("Expected comma after name");
1012 ignore_rest_of_line ();
1016 ++input_line_pointer;
1018 if (*input_line_pointer == '\n')
1020 as_bad ("Missing size expression");
1024 if ((temp = get_absolute_expression ()) < 0)
1026 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1027 ignore_rest_of_line ();
1033 /* For MIPS ECOFF, small objects are put in .sbss. */
1034 if (temp <= bfd_get_gp_size (stdoutput))
1035 bss_seg = subseg_new (".sbss", 1);
1043 if (*input_line_pointer != ',')
1045 as_bad ("Expected comma after size");
1046 ignore_rest_of_line ();
1049 input_line_pointer++;
1051 if (*input_line_pointer == '\n')
1053 as_bad ("Missing alignment");
1056 align = get_absolute_expression ();
1057 if (align > max_alignment)
1059 align = max_alignment;
1060 as_warn ("Alignment too large: %d. assumed.", align);
1065 as_warn ("Alignment negative. 0 assumed.");
1067 record_alignment (bss_seg, align);
1068 } /* if needs align */
1071 symbolP = symbol_find_or_make (name);
1075 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1076 S_GET_OTHER (symbolP) == 0 &&
1077 S_GET_DESC (symbolP) == 0 &&
1078 #endif /* OBJ_AOUT or OBJ_BOUT */
1079 (S_GET_SEGMENT (symbolP) == bss_seg
1080 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1084 #ifdef BFD_ASSEMBLER
1085 subseg_set (bss_seg, 1);
1087 subseg_new (bss_seg, 1);
1091 frag_align (align, 0);
1092 /* detach from old frag */
1093 if (S_GET_SEGMENT (symbolP) == bss_seg)
1094 symbolP->sy_frag->fr_symbol = NULL;
1096 symbolP->sy_frag = frag_now;
1097 p = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1101 S_SET_SEGMENT (symbolP, bss_seg);
1104 /* The symbol may already have been created with a preceding
1105 ".globl" directive -- be careful not to step on storage class
1106 in that case. Otherwise, set it to static. */
1107 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1109 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1111 #endif /* OBJ_COFF */
1115 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1118 #ifdef BFD_ASSEMBLER
1119 subseg_set (current_seg, current_subseg);
1121 subseg_new (current_seg, current_subseg);
1124 demand_empty_rest_of_line ();
1142 register char *name;
1145 register segT segment;
1147 register symbolS *symbolP;
1149 /* we permit ANY defined expression: BSD4.2 demands constants */
1150 name = input_line_pointer;
1151 c = get_symbol_end ();
1152 p = input_line_pointer;
1155 if (*input_line_pointer != ',')
1158 as_bad ("Expected comma after name \"%s\"", name);
1160 ignore_rest_of_line ();
1163 input_line_pointer++;
1164 segment = expression (&exp);
1165 if (segment != absolute_section
1166 && segment != reg_section
1167 && ! SEG_NORMAL (segment))
1169 as_bad ("Bad expression: %s", segment_name (segment));
1170 ignore_rest_of_line ();
1174 symbolP = symbol_find_or_make (name);
1176 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1177 symbolP->sy_desc == 0) out of this test because coff doesn't have
1178 those fields, and I can't see when they'd ever be tripped. I
1179 don't think I understand why they were here so I may have
1180 introduced a bug. As recently as 1.37 didn't have this test
1181 anyway. xoxorich. */
1183 if (S_GET_SEGMENT (symbolP) == undefined_section
1184 && S_GET_VALUE (symbolP) == 0)
1186 /* The name might be an undefined .global symbol; be sure to
1187 keep the "external" bit. */
1188 S_SET_SEGMENT (symbolP, segment);
1189 S_SET_VALUE (symbolP, (valueT) (exp.X_add_number));
1193 as_bad ("Symbol %s already defined", name);
1196 demand_empty_rest_of_line ();
1202 register segT segment;
1204 register long temp_fill;
1206 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1207 thing as a sub-segment-relative origin. Any absolute origin is
1208 given a warning, then assumed to be segment-relative. Any
1209 segmented origin expression ("foo+42") had better be in the right
1210 segment or the .org is ignored.
1212 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1213 we never know sub-segment sizes when we are reading code. BSD
1214 will crash trying to emit negative numbers of filler bytes in
1215 certain .orgs. We don't crash, but see as-write for that code.
1217 Don't make frag if need_pass_2==1. */
1218 segment = get_known_segmented_expression (&exp);
1219 if (*input_line_pointer == ',')
1221 input_line_pointer++;
1222 temp_fill = get_absolute_expression ();
1228 if (segment != now_seg && segment != absolute_section)
1229 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1230 segment_name (segment), segment_name (now_seg));
1231 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1232 exp.X_add_number, (char *) 0);
1234 } /* if (ok to make frag) */
1235 demand_empty_rest_of_line ();
1241 register char *name;
1242 register char delim;
1243 register char *end_name;
1244 register symbolS *symbolP;
1247 * Especial apologies for the random logic:
1248 * this just grew, and could be parsed much more simply!
1251 name = input_line_pointer;
1252 delim = get_symbol_end ();
1253 end_name = input_line_pointer;
1257 if (*input_line_pointer != ',')
1260 as_bad ("Expected comma after name \"%s\"", name);
1262 ignore_rest_of_line ();
1266 input_line_pointer++;
1269 if (name[0] == '.' && name[1] == '\0')
1271 /* Turn '. = mumble' into a .org mumble */
1272 register segT segment;
1276 segment = get_known_segmented_expression (&exp);
1280 if (segment != now_seg && segment != absolute_section)
1281 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1282 segment_name (segment),
1283 segment_name (now_seg));
1284 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1285 exp.X_add_number, (char *) 0);
1287 } /* if (ok to make frag) */
1293 if ((symbolP = symbol_find (name)) == NULL
1294 && (symbolP = md_undefined_symbol (name)) == NULL)
1296 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1298 /* "set" symbols are local unless otherwise specified. */
1299 SF_SET_LOCAL (symbolP);
1300 #endif /* OBJ_COFF */
1302 } /* make a new symbol */
1304 symbol_table_insert (symbolP);
1307 pseudo_set (symbolP);
1308 demand_empty_rest_of_line ();
1316 register long temp_fill;
1319 /* Just like .fill, but temp_size = 1 */
1320 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1322 temp_fill = get_absolute_expression ();
1326 input_line_pointer--; /* Backup over what was not a ','. */
1331 temp_repeat *= mult;
1333 if (temp_repeat <= 0)
1335 as_warn ("Repeat < 0, .space ignored");
1336 ignore_rest_of_line ();
1341 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1342 temp_repeat, (char *) 0);
1345 demand_empty_rest_of_line ();
1353 temp = get_absolute_expression ();
1354 #ifdef BFD_ASSEMBLER
1355 subseg_set (text_section, (subsegT) temp);
1357 subseg_new (text_section, (subsegT) temp);
1359 demand_empty_rest_of_line ();
1364 demand_empty_rest_of_line ()
1367 if (is_end_of_line[*input_line_pointer])
1369 input_line_pointer++;
1373 ignore_rest_of_line ();
1375 /* Return having already swallowed end-of-line. */
1376 } /* Return pointing just after end-of-line. */
1379 ignore_rest_of_line () /* For suspect lines: gives warning. */
1381 if (!is_end_of_line[*input_line_pointer])
1383 if (isprint (*input_line_pointer))
1384 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1385 *input_line_pointer);
1387 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1388 *input_line_pointer);
1389 while (input_line_pointer < buffer_limit
1390 && !is_end_of_line[*input_line_pointer])
1392 input_line_pointer++;
1395 input_line_pointer++; /* Return pointing just after end-of-line. */
1396 know (is_end_of_line[input_line_pointer[-1]]);
1402 * In: Pointer to a symbol.
1403 * Input_line_pointer->expression.
1405 * Out: Input_line_pointer->just after any whitespace after expression.
1406 * Tried to set symbol to value of expression.
1407 * Will change symbols type, value, and frag;
1408 * May set need_pass_2 == 1.
1411 pseudo_set (symbolP)
1415 register segT segment;
1416 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1418 #endif /* OBJ_AOUT or OBJ_BOUT */
1420 know (symbolP); /* NULL pointer is logic error. */
1421 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1422 /* @@ Fix this right for BFD. */
1423 ext = S_IS_EXTERNAL (symbolP);
1424 #endif /* OBJ_AOUT or OBJ_BOUT */
1426 if ((segment = expression (&exp)) == absent_section)
1428 as_bad ("Missing expression: absolute 0 assumed");
1429 exp.X_seg = absolute_section;
1430 exp.X_add_number = 0;
1433 if (segment == reg_section)
1435 S_SET_SEGMENT (symbolP, reg_section);
1436 S_SET_VALUE (symbolP, exp.X_add_number);
1437 symbolP->sy_frag = &zero_address_frag;
1439 else if (segment == big_section)
1441 as_bad ("%s number invalid. Absolute 0 assumed.",
1442 exp.X_add_number > 0 ? "Bignum" : "Floating-Point");
1443 S_SET_SEGMENT (symbolP, absolute_section);
1444 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1445 /* @@ Fix this right for BFD. */
1446 ext ? S_SET_EXTERNAL (symbolP) :
1447 S_CLEAR_EXTERNAL (symbolP);
1448 #endif /* OBJ_AOUT or OBJ_BOUT */
1449 S_SET_VALUE (symbolP, 0);
1450 symbolP->sy_frag = &zero_address_frag;
1452 else if (segment == absent_section)
1454 as_warn ("No expression: Using absolute 0");
1455 S_SET_SEGMENT (symbolP, absolute_section);
1456 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1457 /* @@ Fix this right for BFD. */
1458 ext ? S_SET_EXTERNAL (symbolP) :
1459 S_CLEAR_EXTERNAL (symbolP);
1460 #endif /* OBJ_AOUT or OBJ_BOUT */
1461 S_SET_VALUE (symbolP, 0);
1462 symbolP->sy_frag = &zero_address_frag;
1464 else if (segment == diff_section)
1466 if (exp.X_add_symbol && exp.X_subtract_symbol
1467 && (S_GET_SEGMENT (exp.X_add_symbol) ==
1468 S_GET_SEGMENT (exp.X_subtract_symbol)))
1470 if (exp.X_add_symbol->sy_frag == exp.X_subtract_symbol->sy_frag)
1472 exp.X_add_number += S_GET_VALUE (exp.X_add_symbol) -
1473 S_GET_VALUE (exp.X_subtract_symbol);
1476 as_bad ("Invalid expression: separation between symbols `%s'",
1477 S_GET_NAME (exp.X_add_symbol));
1478 as_bad (" and `%s' may not be constant",
1479 S_GET_NAME (exp.X_subtract_symbol));
1484 as_bad ("Complex expression. Absolute segment assumed.");
1488 else if (segment == absolute_section)
1491 S_SET_SEGMENT (symbolP, absolute_section);
1492 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1493 /* @@ Fix this right for BFD. */
1494 ext ? S_SET_EXTERNAL (symbolP) :
1495 S_CLEAR_EXTERNAL (symbolP);
1496 #endif /* OBJ_AOUT or OBJ_BOUT */
1497 S_SET_VALUE (symbolP, exp.X_add_number);
1498 symbolP->sy_frag = &zero_address_frag;
1500 else if (segment == pass1_section)
1502 symbolP->sy_value.X_add_symbol = exp.X_add_symbol;
1503 symbolP->sy_value.X_subtract_symbol = NULL;
1504 symbolP->sy_value.X_add_number = 0;
1505 symbolP->sy_value.X_seg = undefined_section;
1506 as_bad ("Unknown expression");
1507 know (need_pass_2 == 1);
1509 else if (segment == undefined_section)
1511 symbolP->sy_value.X_add_symbol = exp.X_add_symbol;
1512 symbolP->sy_value.X_subtract_symbol = NULL;
1513 symbolP->sy_value.X_add_number = 0;
1514 symbolP->sy_value.X_seg = undefined_section;
1518 #ifndef BFD_ASSEMBLER
1519 #ifndef MANY_SEGMENTS
1528 as_fatal ("failed sanity check.");
1529 } /* switch on segment */
1532 S_SET_SEGMENT (symbolP, segment);
1533 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1534 /* @@ Fix this right for BFD! */
1537 S_SET_EXTERNAL (symbolP);
1541 S_CLEAR_EXTERNAL (symbolP);
1543 #endif /* OBJ_AOUT or OBJ_BOUT */
1545 S_SET_VALUE (symbolP, exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1546 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1553 * CONStruct more frag of .bytes, or .words etc.
1554 * Should need_pass_2 be 1 then emit no frag(s).
1555 * This understands EXPRESSIONS, as opposed to big_cons().
1559 * This has a split personality. We use expression() to read the
1560 * value. We can detect if the value won't fit in a byte or word.
1561 * But we can't detect if expression() discarded significant digits
1562 * in the case of a long. Not worth the crocks required to fix it.
1565 /* Select a parser for cons expressions. */
1567 /* Some targets need to parse the expression in various fancy ways.
1568 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1569 (for example, the HPPA does this). Otherwise, you can define
1570 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1571 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1572 are defined, which is the normal case, then only simple expressions
1575 #ifndef TC_PARSE_CONS_EXPRESSION
1576 #ifdef BITFIELD_CONS_EXPRESSIONS
1577 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1579 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1582 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1584 parse_mri_cons PARAMS ((expressionS *exp));
1586 #ifdef REPEAT_CONS_EXPRESSIONS
1587 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1589 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1592 /* If we haven't gotten one yet, just call expression. */
1593 #ifndef TC_PARSE_CONS_EXPRESSION
1594 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1598 /* worker to do .byte etc statements */
1599 /* clobbers input_line_pointer, checks */
1603 register unsigned int nbytes; /* 1=.byte, 2=.word, 4=.long */
1607 if (is_it_end_of_statement ())
1609 demand_empty_rest_of_line ();
1615 TC_PARSE_CONS_EXPRESSION (&exp, nbytes);
1616 emit_expr (&exp, nbytes);
1618 while (*input_line_pointer++ == ',');
1620 input_line_pointer--; /* Put terminator back into stream. */
1621 demand_empty_rest_of_line ();
1624 /* Put the contents of expression EXP into the object file using
1625 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1628 emit_expr (exp, nbytes)
1630 unsigned int nbytes;
1635 /* Don't do anything if we are going to make another pass. */
1639 segment = exp->X_seg;
1641 /* Don't call this if we are going to junk this pass anyway! */
1642 know (segment != pass1_section);
1644 if (segment == diff_section && exp->X_add_symbol == NULL)
1646 as_bad ("Subtracting symbol \"%s\" (segment \"%s\") is too hard. Absolute segment assumed.",
1647 S_GET_NAME (exp->X_subtract_symbol),
1648 segment_name (S_GET_SEGMENT (exp->X_subtract_symbol)));
1649 segment = absolute_section;
1650 /* Leave exp->X_add_number alone. */
1652 else if (segment == absent_section)
1654 as_warn ("0 assumed for missing expression");
1655 exp->X_add_number = 0;
1656 know (exp->X_add_symbol == NULL);
1657 segment = absolute_section;
1659 else if (segment == big_section)
1661 as_bad ("%s number invalid. Absolute 0 assumed.",
1662 exp->X_add_number > 0 ? "Bignum" : "Floating-Point");
1663 exp->X_add_number = 0;
1664 segment = absolute_section;
1667 p = frag_more (nbytes);
1669 #ifndef WORKING_DOT_WORD
1670 /* If we have the difference of two symbols in a word, save it on
1671 the broken_words list. See the code in write.c. */
1672 if (segment == diff_section && nbytes == 2)
1674 struct broken_word *x;
1676 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1677 x->next_broken_word = broken_words;
1680 x->word_goes_here = p;
1682 x->add = exp->X_add_symbol;
1683 x->sub = exp->X_subtract_symbol;
1684 x->addnum = exp->X_add_number;
1691 if (segment == absolute_section)
1696 register long unmask;
1698 /* JF << of >= number of bits in the object is undefined. In
1699 particular SPARC (Sun 4) has problems */
1700 if (nbytes >= sizeof (long))
1703 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1705 unmask = ~mask; /* Do store these bits. */
1708 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1709 mask = ~(unmask >> 1); /* Includes sign bit now. */
1712 get = exp->X_add_number;
1714 if ((get & mask) != 0 && (get & mask) != mask)
1715 { /* Leading bits contain both 0s & 1s. */
1716 as_warn ("Value 0x%x truncated to 0x%x.", get, use);
1718 md_number_to_chars (p, use, nbytes); /* put bytes in right order. */
1722 md_number_to_chars (p, (long) 0, nbytes);
1724 /* Now we need to generate a fixS to record the symbol value.
1725 This is easy for BFD. For other targets it can be more
1726 complex. For very complex cases (currently, the HPPA and
1727 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1728 want. For simpler cases, you can define TC_CONS_RELOC to be
1729 the name of the reloc code that should be stored in the fixS.
1730 If neither is defined, the code uses NO_RELOC if it is
1731 defined, and otherwise uses 0. */
1733 #ifdef BFD_ASSEMBLER
1734 fix_new (frag_now, p - frag_now->fr_literal, nbytes,
1735 exp->X_add_symbol, exp->X_subtract_symbol,
1736 exp->X_add_number, 0,
1737 /* @@ Should look at CPU word size. */
1740 #ifdef TC_CONS_FIX_NEW
1741 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1743 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1744 it is defined, otherwise use NO_RELOC if it is defined,
1746 #ifndef TC_CONS_RELOC
1748 #define TC_CONS_RELOC NO_RELOC
1750 #define TC_CONS_RELOC 0
1753 fix_new (frag_now, p - frag_now->fr_literal, nbytes,
1754 exp->X_add_symbol, exp->X_subtract_symbol,
1755 exp->X_add_number, 0, TC_CONS_RELOC);
1756 #endif /* TC_CONS_FIX_NEW */
1757 #endif /* BFD_ASSEMBLER */
1761 #ifdef BITFIELD_CONS_EXPRESSIONS
1763 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1764 w:x,y:z, where w and y are bitwidths and x and y are values. They
1765 then pack them all together. We do a little better in that we allow
1766 them in words, longs, etc. and we'll pack them in target byte order
1769 The rules are: pack least significat bit first, if a field doesn't
1770 entirely fit, put it in the next unit. Overflowing the bitfield is
1771 explicitly *not* even a warning. The bitwidth should be considered
1774 To use this function the tc-XXX.h file should define
1775 BITFIELD_CONS_EXPRESSIONS. */
1778 parse_bitfield_cons (exp, nbytes)
1780 unsigned int nbytes;
1782 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1783 char *hold = input_line_pointer;
1786 segment = expression (exp);
1788 if (*input_line_pointer == ':')
1794 unsigned long width;
1796 if (*input_line_pointer != ':')
1798 input_line_pointer = hold;
1800 } /* next piece is not a bitfield */
1802 /* In the general case, we can't allow
1803 full expressions with symbol
1804 differences and such. The relocation
1805 entries for symbols not defined in this
1806 assembly would require arbitrary field
1807 widths, positions, and masks which most
1808 of our current object formats don't
1811 In the specific case where a symbol
1812 *is* defined in this assembly, we
1813 *could* build fixups and track it, but
1814 this could lead to confusion for the
1815 backends. I'm lazy. I'll take any
1816 SEG_ABSOLUTE. I think that means that
1817 you can use a previous .set or
1818 .equ type symbol. xoxorich. */
1820 if (segment == absent_section)
1822 as_warn ("Using a bit field width of zero.");
1823 exp->X_add_number = 0;
1824 segment = absolute_section;
1825 } /* implied zero width bitfield */
1827 if (segment != absolute_section)
1829 *input_line_pointer = '\0';
1830 as_bad ("Field width \"%s\" too complex for a bitfield.\n", hold);
1831 *input_line_pointer = ':';
1832 demand_empty_rest_of_line ();
1836 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1838 as_warn ("Field width %d too big to fit in %d bytes: truncated to %d bits.",
1839 width, nbytes, (BITS_PER_CHAR * nbytes));
1840 width = BITS_PER_CHAR * nbytes;
1843 if (width > bits_available)
1845 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1846 input_line_pointer = hold;
1847 exp->X_add_number = value;
1851 hold = ++input_line_pointer; /* skip ':' */
1853 if ((segment = expression (exp)) != absolute_section)
1855 char cache = *input_line_pointer;
1857 *input_line_pointer = '\0';
1858 as_bad ("Field value \"%s\" too complex for a bitfield.\n", hold);
1859 *input_line_pointer = cache;
1860 demand_empty_rest_of_line ();
1864 value |= (~(-1 << width) & exp->X_add_number)
1865 << ((BITS_PER_CHAR * nbytes) - bits_available);
1867 if ((bits_available -= width) == 0
1868 || is_it_end_of_statement ()
1869 || *input_line_pointer != ',')
1872 } /* all the bitfields we're gonna get */
1874 hold = ++input_line_pointer;
1875 segment = expression (exp);
1876 } /* forever loop */
1878 exp->X_add_number = value;
1879 exp->X_seg = absolute_section;
1880 } /* if looks like a bitfield */
1881 } /* parse_bitfield_cons() */
1883 #endif /* BITFIELD_CONS_EXPRESSIONS */
1888 parse_mri_cons (exp, nbytes)
1890 unsigned int nbytes;
1892 if (*input_line_pointer == '\'')
1894 /* An MRI style string, cut into as many bytes as will fit into
1895 a nbyte chunk, left justify if necessary, and separate with
1896 commas so we can try again later */
1898 unsigned int result = 0;
1899 input_line_pointer++;
1900 for (scan = 0; scan < nbytes; scan++)
1902 if (*input_line_pointer == '\'')
1904 if (input_line_pointer[1] == '\'')
1906 input_line_pointer++;
1911 result = (result << 8) | (*input_line_pointer++);
1915 while (scan < nbytes)
1920 /* Create correct expression */
1921 exp->X_add_symbol = 0;
1922 exp->X_add_number = result;
1923 exp->X_seg = absolute_section;
1924 /* Fake it so that we can read the next char too */
1925 if (input_line_pointer[0] != '\'' ||
1926 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
1928 input_line_pointer -= 2;
1929 input_line_pointer[0] = ',';
1930 input_line_pointer[1] = '\'';
1933 input_line_pointer++;
1941 #ifdef REPEAT_CONS_EXPRESSIONS
1943 /* Parse a repeat expression for cons. This is used by the MIPS
1944 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1945 object file COUNT times.
1947 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1950 parse_repeat_cons (exp, nbytes)
1952 unsigned int nbytes;
1960 if (*input_line_pointer != ':')
1962 /* No repeat count. */
1966 ++input_line_pointer;
1967 segment = expression (&count);
1968 if (segment != absolute_section
1969 || count.X_add_number <= 0)
1971 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1975 /* The cons function is going to output this expression once. So we
1976 output it count - 1 times. */
1977 for (i = count.X_add_number - 1; i > 0; i--)
1978 emit_expr (exp, nbytes);
1981 #endif /* REPEAT_CONS_EXPRESSIONS */
1986 * CONStruct more frag(s) of .quads, or .octa etc.
1987 * Makes 0 or more new frags.
1988 * If need_pass_2 == 1, generate no frag.
1989 * This understands only bignums, not expressions. Cons() understands
1992 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
1994 * This creates objects with struct obstack_control objs, destroying
1995 * any context objs held about a partially completed object. Beware!
1998 * I think it sucks to have 2 different types of integers, with 2
1999 * routines to read them, store them etc.
2000 * It would be nicer to permit bignums in expressions and only
2001 * complain if the result overflowed. However, due to "efficiency"...
2003 /* worker to do .quad etc statements */
2004 /* clobbers input_line_pointer, checks */
2006 /* 8=.quad 16=.octa ... */
2010 register int nbytes;
2012 register char c; /* input_line_pointer->c. */
2014 register long length; /* Number of chars in an object. */
2015 register int digit; /* Value of 1 digit. */
2016 register int carry; /* For multi-precision arithmetic. */
2017 register int work; /* For multi-precision arithmetic. */
2018 register char *p; /* For multi-precision arithmetic. */
2020 extern const char hex_value[]; /* In hex_value.c. */
2023 * The following awkward logic is to parse ZERO or more strings,
2024 * comma seperated. Recall an expression includes its leading &
2025 * trailing blanks. We fake a leading ',' if there is (supposed to
2026 * be) a 1st expression, and keep demanding 1 expression for each ','.
2028 if (is_it_end_of_statement ())
2030 c = 0; /* Skip loop. */
2034 c = ','; /* Do loop. */
2035 --input_line_pointer;
2039 ++input_line_pointer;
2041 c = *input_line_pointer;
2042 /* C contains 1st non-blank character of what we hope is a number. */
2045 c = *++input_line_pointer;
2046 if (c == 'x' || c == 'X')
2048 c = *++input_line_pointer;
2061 * This feature (?) is here to stop people worrying about
2062 * mysterious zero constants: which is what they get when
2063 * they completely omit digits.
2065 if (hex_value[c] >= radix)
2067 as_bad ("Missing digits. 0 assumed.");
2069 bignum_high = bignum_low - 1; /* Start constant with 0 chars. */
2070 for (; (digit = hex_value[c]) < radix; c = *++input_line_pointer)
2072 /* Multiply existing number by radix, then add digit. */
2074 for (p = bignum_low; p <= bignum_high; p++)
2076 work = (*p & MASK_CHAR) * radix + carry;
2077 *p = work & MASK_CHAR;
2078 carry = work >> BITS_PER_CHAR;
2083 *bignum_high = carry & MASK_CHAR;
2084 know ((carry & ~MASK_CHAR) == 0);
2087 length = bignum_high - bignum_low + 1;
2088 if (length > nbytes)
2090 as_warn ("Most significant bits truncated in integer constant.");
2094 register long leading_zeroes;
2096 for (leading_zeroes = nbytes - length;
2106 char *src = bignum_low;
2107 p = frag_more (nbytes);
2108 if (target_big_endian)
2111 for (i = nbytes - 1; i >= 0; i--)
2115 bcopy (bignum_low, p, (int) nbytes);
2117 /* C contains character after number. */
2119 c = *input_line_pointer;
2120 /* C contains 1st non-blank character after number. */
2122 demand_empty_rest_of_line ();
2125 /* Extend bignum by 1 char. */
2129 register long length;
2132 if (bignum_high >= bignum_limit)
2134 length = bignum_limit - bignum_low;
2135 bignum_low = xrealloc (bignum_low, length + length);
2136 bignum_high = bignum_low + length;
2137 bignum_limit = bignum_low + length + length;
2139 } /* grow_bignum(); */
2144 * CONStruct some more frag chars of .floats .ffloats etc.
2145 * Makes 0 or more new frags.
2146 * If need_pass_2 == 1, no frags are emitted.
2147 * This understands only floating literals, not expressions. Sorry.
2149 * A floating constant is defined by atof_generic(), except it is preceded
2150 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2151 * reading, I decided to be incompatible. This always tries to give you
2152 * rounded bits to the precision of the pseudo-op. Former AS did premature
2153 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2154 * a choice of 2 flavours of noise according to which of 2 floating-point
2155 * scanners you directed AS to use.
2157 * In: input_line_pointer->whitespace before, or '0' of flonum.
2161 void /* JF was static, but can't be if VAX.C is goning to use it */
2162 float_cons (float_type) /* Worker to do .float etc statements. */
2163 /* Clobbers input_line-pointer, checks end-of-line. */
2164 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2168 int length; /* Number of chars in an object. */
2169 register char *err; /* Error from scanning floating literal. */
2170 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2173 * The following awkward logic is to parse ZERO or more strings,
2174 * comma seperated. Recall an expression includes its leading &
2175 * trailing blanks. We fake a leading ',' if there is (supposed to
2176 * be) a 1st expression, and keep demanding 1 expression for each ','.
2178 if (is_it_end_of_statement ())
2180 c = 0; /* Skip loop. */
2181 ++input_line_pointer; /*->past termintor. */
2185 c = ','; /* Do loop. */
2189 /* input_line_pointer->1st char of a flonum (we hope!). */
2191 /* Skip any 0{letter} that may be present. Don't even check if the
2192 * letter is legal. Someone may invent a "z" format and this routine
2193 * has no use for such information. Lusers beware: you get
2194 * diagnostics if your input is ill-conditioned.
2197 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2198 input_line_pointer += 2;
2200 err = md_atof (float_type, temp, &length);
2201 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2205 as_bad ("Bad floating literal: %s", err);
2206 ignore_rest_of_line ();
2207 /* Input_line_pointer->just after end-of-line. */
2208 c = 0; /* Break out of loop. */
2214 p = frag_more (length);
2215 bcopy (temp, p, length);
2218 c = *input_line_pointer++;
2219 /* C contains 1st non-white character after number. */
2220 /* input_line_pointer->just after terminator (c). */
2223 --input_line_pointer; /*->terminator (is not ','). */
2224 demand_empty_rest_of_line ();
2225 } /* float_cons() */
2230 * We read 0 or more ',' seperated, double-quoted strings.
2232 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2237 stringer (append_zero) /* Worker to do .ascii etc statements. */
2238 /* Checks end-of-line. */
2239 register int append_zero; /* 0: don't append '\0', else 1 */
2241 register unsigned int c;
2244 * The following awkward logic is to parse ZERO or more strings,
2245 * comma seperated. Recall a string expression includes spaces
2246 * before the opening '\"' and spaces after the closing '\"'.
2247 * We fake a leading ',' if there is (supposed to be)
2248 * a 1st, expression. We keep demanding expressions for each
2251 if (is_it_end_of_statement ())
2253 c = 0; /* Skip loop. */
2254 ++input_line_pointer; /* Compensate for end of loop. */
2258 c = ','; /* Do loop. */
2260 while (c == ',' || c == '<' || c == '"')
2263 switch (*input_line_pointer)
2266 ++input_line_pointer; /*->1st char of string. */
2267 while (is_a_char (c = next_char_of_string ()))
2269 FRAG_APPEND_1_CHAR (c);
2273 FRAG_APPEND_1_CHAR (0);
2275 know (input_line_pointer[-1] == '\"');
2278 input_line_pointer++;
2279 c = get_single_number ();
2280 FRAG_APPEND_1_CHAR (c);
2281 if (*input_line_pointer != '>')
2283 as_bad ("Expected <nn>");
2285 input_line_pointer++;
2288 input_line_pointer++;
2292 c = *input_line_pointer;
2295 demand_empty_rest_of_line ();
2298 /* FIXME-SOMEDAY: I had trouble here on characters with the
2299 high bits set. We'll probably also have trouble with
2300 multibyte chars, wide chars, etc. Also be careful about
2301 returning values bigger than 1 byte. xoxorich. */
2304 next_char_of_string ()
2306 register unsigned int c;
2308 c = *input_line_pointer++ & CHAR_MASK;
2316 switch (c = *input_line_pointer++)
2346 break; /* As itself. */
2361 for (number = 0; isdigit (c); c = *input_line_pointer++)
2363 number = number * 8 + c - '0';
2367 --input_line_pointer;
2371 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2372 as_warn ("Unterminated string: Newline inserted.");
2378 #ifdef ONLY_STANDARD_ESCAPES
2379 as_bad ("Bad escaped character in string, '?' assumed");
2381 #endif /* ONLY_STANDARD_ESCAPES */
2384 } /* switch on escaped char */
2389 } /* switch on char */
2391 } /* next_char_of_string() */
2394 get_segmented_expression (expP)
2395 register expressionS *expP;
2397 register segT retval;
2399 retval = expression (expP);
2400 if (retval == pass1_section
2401 || retval == absent_section
2402 || retval == big_section)
2404 as_bad ("Expected address expression: absolute 0 assumed");
2405 retval = expP->X_seg = absolute_section;
2406 expP->X_add_number = 0;
2407 expP->X_add_symbol = expP->X_subtract_symbol = 0;
2409 return (retval); /* SEG_ ABSOLUTE,UNKNOWN,DATA,TEXT,BSS */
2413 get_known_segmented_expression (expP)
2414 register expressionS *expP;
2416 register segT retval;
2417 register CONST char *name1;
2418 register CONST char *name2;
2420 if ((retval = get_segmented_expression (expP)) == undefined_section)
2422 name1 = expP->X_add_symbol ? S_GET_NAME (expP->X_add_symbol) : "";
2423 name2 = expP->X_subtract_symbol ?
2424 S_GET_NAME (expP->X_subtract_symbol) :
2428 as_warn ("Symbols \"%s\" \"%s\" are undefined: absolute 0 assumed.",
2433 as_warn ("Symbol \"%s\" undefined: absolute 0 assumed.",
2434 name1 ? name1 : name2);
2436 retval = expP->X_seg = absolute_section;
2437 expP->X_add_number = 0;
2438 expP->X_add_symbol = expP->X_subtract_symbol = NULL;
2440 know (retval == absolute_section
2441 || retval == diff_section
2442 || SEG_NORMAL (retval));
2445 } /* get_known_segmented_expression() */
2449 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2450 get_absolute_expression ()
2455 if ((s = expression (&exp)) != absolute_section)
2457 if (s != absent_section)
2459 as_bad ("Bad Absolute Expression, absolute 0 assumed.");
2461 exp.X_add_number = 0;
2463 return (exp.X_add_number);
2466 char /* return terminator */
2467 get_absolute_expression_and_terminator (val_pointer)
2468 long *val_pointer; /* return value of expression */
2470 *val_pointer = get_absolute_expression ();
2471 return (*input_line_pointer++);
2475 * demand_copy_C_string()
2477 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2478 * Give a warning if that happens.
2481 demand_copy_C_string (len_pointer)
2486 if ((s = demand_copy_string (len_pointer)) != 0)
2490 for (len = *len_pointer;
2499 as_bad ("This string may not contain \'\\0\'");
2507 * demand_copy_string()
2509 * Demand string, but return a safe (=private) copy of the string.
2510 * Return NULL if we can't read a string here.
2513 demand_copy_string (lenP)
2516 register unsigned int c;
2522 if (*input_line_pointer == '\"')
2524 input_line_pointer++; /* Skip opening quote. */
2526 while (is_a_char (c = next_char_of_string ()))
2528 obstack_1grow (¬es, c);
2531 /* JF this next line is so demand_copy_C_string will return a null
2532 termanated string. */
2533 obstack_1grow (¬es, '\0');
2534 retval = obstack_finish (¬es);
2538 as_warn ("Missing string");
2540 ignore_rest_of_line ();
2544 } /* demand_copy_string() */
2547 * is_it_end_of_statement()
2549 * In: Input_line_pointer->next character.
2551 * Do: Skip input_line_pointer over all whitespace.
2553 * Out: 1 if input_line_pointer->end-of-line.
2556 is_it_end_of_statement ()
2559 return (is_end_of_line[*input_line_pointer]);
2560 } /* is_it_end_of_statement() */
2566 register symbolS *symbolP; /* symbol we are working with */
2568 input_line_pointer++;
2569 if (*input_line_pointer == '=')
2570 input_line_pointer++;
2572 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2573 input_line_pointer++;
2575 if (sym_name[0] == '.' && sym_name[1] == '\0')
2577 /* Turn '. = mumble' into a .org mumble */
2578 register segT segment;
2582 segment = get_known_segmented_expression (&exp);
2585 if (segment != now_seg && segment != absolute_section)
2586 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2587 segment_name (segment),
2588 segment_name (now_seg));
2589 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2590 exp.X_add_number, (char *) 0);
2592 } /* if (ok to make frag) */
2596 symbolP = symbol_find_or_make (sym_name);
2597 pseudo_set (symbolP);
2601 /* .include -- include a file at this point. */
2614 filename = demand_copy_string (&i);
2615 demand_empty_rest_of_line ();
2616 path = xmalloc (i + include_dir_maxlen + 5 /* slop */ );
2617 for (i = 0; i < include_dir_count; i++)
2619 strcpy (path, include_dirs[i]);
2621 strcat (path, filename);
2622 if (0 != (try = fopen (path, "r")))
2631 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2632 newbuf = input_scrub_include_file (path, input_line_pointer);
2633 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2637 add_include_dir (path)
2642 if (include_dir_count == 0)
2644 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2645 include_dirs[0] = "."; /* Current dir */
2646 include_dir_count = 2;
2650 include_dir_count++;
2651 include_dirs = (char **) realloc (include_dirs,
2652 include_dir_count * sizeof (*include_dirs));
2655 include_dirs[include_dir_count - 1] = path; /* New one */
2658 if (i > include_dir_maxlen)
2659 include_dir_maxlen = i;
2660 } /* add_include_dir() */
2666 while (!is_end_of_line[*input_line_pointer])
2668 ++input_line_pointer;
2670 ++input_line_pointer;