1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991, 1993 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
22 change this a bit. But then, GNU isn't
23 spozed to run on your machine anyway.
24 (RMS is so shortsighted sometimes.)
27 #define MASK_CHAR ((int)(unsigned char)-1)
31 /* This is the largest known floating point format (for now). It will
32 grow when we do 4361 style flonums. */
34 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
36 /* Routines that read assembler source text to build spagetti in memory.
37 Another group of these functions is in the expr.c module. */
51 #ifndef TC_START_LABEL
52 #define TC_START_LABEL(x,y) (x==':')
55 /* The NOP_OPCODE is for the alignment fill value.
56 * fill it a nop instruction so that the disassembler does not choke
60 #define NOP_OPCODE 0x00
63 char *input_line_pointer; /*->next char of source file to parse. */
65 #if BITS_PER_CHAR != 8
66 /* The following table is indexed by[(char)] and will break if
67 a char does not have exactly 256 states (hopefully 0:255!)! */
72 /* The m88k unfortunately uses @ as a label beginner. */
76 /* used by is_... macros. our ctype[] */
77 const char lex_type[256] =
79 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
80 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
81 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
82 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
83 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
84 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
85 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
86 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
91 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99 * Out: 1 if this character ends a line.
102 char is_end_of_line[256] =
105 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
107 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
109 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
111 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
112 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
114 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
115 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
117 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
118 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
121 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
122 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
123 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
124 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
125 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
129 /* Functions private to this file. */
131 static char *buffer; /* 1st char of each buffer of lines is here. */
132 static char *buffer_limit; /*->1 + last char in buffer. */
134 static char *bignum_low; /* Lowest char of bignum. */
135 static char *bignum_limit; /* 1st illegal address of bignum. */
136 static char *bignum_high; /* Highest char of bignum. */
137 /* May point to (bignum_start-1). */
138 /* Never >= bignum_limit. */
140 int target_big_endian;
142 static char *old_buffer; /* JF a hack */
143 static char *old_input;
144 static char *old_limit;
146 /* Variables for handling include file directory list. */
148 char **include_dirs; /* List of pointers to directories to
149 search for .include's */
150 int include_dir_count; /* How many are in the list */
151 int include_dir_maxlen = 1;/* Length of longest in list */
153 #ifndef WORKING_DOT_WORD
154 struct broken_word *broken_words;
155 int new_broken_words;
158 static char *demand_copy_string PARAMS ((int *lenP));
159 int is_it_end_of_statement PARAMS ((void));
160 unsigned int next_char_of_string PARAMS ((void));
161 static segT get_segmented_expression PARAMS ((expressionS *expP));
162 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
163 static void grow_bignum PARAMS ((void));
164 static void pobegin PARAMS ((void));
175 obj_read_begin_hook ();
177 /* Something close -- but not too close -- to a multiple of 1024.
178 The debugging malloc I'm using has 24 bytes of overhead. */
179 obstack_begin (¬es, 5090);
180 obstack_begin (&cond_obstack, 990);
182 #define BIGNUM_BEGIN_SIZE (16)
183 bignum_low = xmalloc ((long) BIGNUM_BEGIN_SIZE);
184 bignum_limit = bignum_low + BIGNUM_BEGIN_SIZE;
186 /* Use machine dependent syntax */
187 for (p = line_separator_chars; *p; p++)
188 is_end_of_line[*p] = 1;
189 /* Use more. FIXME-SOMEDAY. */
192 /* set up pseudo-op tables */
194 struct hash_control *po_hash;
196 static const pseudo_typeS potable[] =
198 {"abort", s_abort, 0},
199 {"align", s_align_ptwo, 0},
200 {"ascii", stringer, 0},
201 {"asciz", stringer, 1},
207 {"double", float_cons, 'd'},
209 {"eject", listing_eject, 0}, /* Formfeed listing */
212 {"endif", s_endif, 0},
217 {"extern", s_ignore, 0}, /* We treat all undef as ext */
218 {"appfile", s_app_file, 1},
219 {"appline", s_app_line, 0},
220 {"file", s_app_file, 0},
222 {"float", float_cons, 'f'},
223 {"global", s_globl, 0},
224 {"globl", s_globl, 0},
227 {"ifdef", s_ifdef, 0},
228 {"ifeqs", s_ifeqs, 0},
229 {"ifndef", s_ifdef, 1},
230 {"ifnes", s_ifeqs, 1},
231 {"ifnotdef", s_ifdef, 1},
232 {"include", s_include, 0},
234 {"lcomm", s_lcomm, 0},
235 {"lflags", listing_flags, 0}, /* Listing flags */
236 {"list", listing_list, 1}, /* Turn listing on */
239 {"nolist", listing_list, 0}, /* Turn listing off */
240 {"octa", big_cons, 16},
242 {"psize", listing_psize, 0}, /* set paper size */
244 {"quad", big_cons, 8},
245 {"sbttl", listing_title, 1}, /* Subtitle of listing */
250 {"single", float_cons, 'f'},
252 {"space", s_space, 0},
253 {"string", stringer, 1},
256 {"title", listing_title, 0}, /* Listing title */
261 {NULL} /* end sentinel */
267 char *errtxt; /* error text */
268 const pseudo_typeS *pop;
270 po_hash = hash_new ();
272 /* Do the target-specific pseudo ops. */
273 for (pop = md_pseudo_table; pop->poc_name; pop++)
275 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
276 if (errtxt && *errtxt)
278 as_fatal ("error constructing md pseudo-op table");
282 /* Now object specific. Skip any that were in the target table. */
283 for (pop = obj_pseudo_table; pop->poc_name; pop++)
285 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
286 if (errtxt && *errtxt)
288 if (!strcmp (errtxt, "exists"))
290 #ifdef DIE_ON_OVERRIDES
291 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
292 #endif /* DIE_ON_OVERRIDES */
293 continue; /* OK if target table overrides. */
297 as_fatal ("error constructing obj pseudo-op table");
298 } /* if overridden */
302 /* Now portable ones. Skip any that we've seen already. */
303 for (pop = potable; pop->poc_name; pop++)
305 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
306 if (errtxt && *errtxt)
308 if (!strcmp (errtxt, "exists"))
310 #ifdef DIE_ON_OVERRIDES
311 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
312 #endif /* DIE_ON_OVERRIDES */
313 continue; /* OK if target table overrides. */
317 as_fatal ("error constructing obj pseudo-op table");
318 } /* if overridden */
325 #define HANDLE_CONDITIONAL_ASSEMBLY() \
326 if (ignore_input ()) \
328 while (! is_end_of_line[*input_line_pointer++]) \
329 if (input_line_pointer == buffer_limit) \
335 /* read_a_source_file()
337 * We read the file, putting things into a web that
338 * represents what we have been reading.
341 read_a_source_file (name)
345 register char *s; /* string of symbol, '\0' appended */
349 buffer = input_scrub_new_file (name);
352 listing_newline ("");
354 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
355 { /* We have another line to parse. */
356 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
357 contin: /* JF this goto is my fault I admit it.
358 Someone brave please re-write the whole
359 input section here? Pleeze??? */
360 while (input_line_pointer < buffer_limit)
362 /* We have more of this buffer to parse. */
365 * We now have input_line_pointer->1st char of next line.
366 * If input_line_pointer [-1] == '\n' then we just
367 * scanned another line: so bump line counters.
369 if (input_line_pointer[-1] == '\n')
371 bump_line_counters ();
374 /* Text at the start of a line must be a label, we run down and stick a colon in */
375 if (is_name_beginner (*input_line_pointer))
377 char *line_start = input_line_pointer;
378 char c = get_symbol_end ();
380 *input_line_pointer = c;
382 input_line_pointer++;
390 * We are at the begining of a line, or similar place.
391 * We expect a well-formed assembler statement.
392 * A "symbol-name:" is a statement.
394 * Depending on what compiler is used, the order of these tests
395 * may vary to catch most common case 1st.
396 * Each test is independent of all other tests at the (top) level.
397 * PLEASE make a compiler that doesn't use this assembler.
398 * It is crufty to waste a compiler's time encoding things for this
399 * assembler, which then wastes more time decoding it.
400 * (And communicating via (linear) files is silly!
401 * If you must pass stuff, please pass a tree!)
403 if ((c = *input_line_pointer++) == '\t'
408 c = *input_line_pointer++;
410 know (c != ' '); /* No further leading whitespace. */
413 * C is the 1st significant character.
414 * Input_line_pointer points after that character.
416 if (is_name_beginner (c))
417 { /* want user-defined label or pseudo/opcode */
418 HANDLE_CONDITIONAL_ASSEMBLY ();
420 s = --input_line_pointer;
421 c = get_symbol_end (); /* name's delimiter */
423 * C is character after symbol.
424 * That character's place in the input line is now '\0'.
425 * S points to the beginning of the symbol.
426 * [In case of pseudo-op, s->'.'.]
427 * Input_line_pointer->'\0' where c was.
429 if (TC_START_LABEL(c, input_line_pointer))
431 colon (s); /* user-defined label */
432 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
433 /* Input_line_pointer->after ':'. */
438 else if (c == '=' || input_line_pointer[1] == '=')
441 demand_empty_rest_of_line ();
444 { /* expect pseudo-op or machine instruction */
446 if (!done_pseudo (s))
453 /* The m88k uses pseudo-ops without a period. */
454 pop = (pseudo_typeS *) hash_find (po_hash, s);
455 if (pop != NULL && pop->poc_handler == NULL)
459 if (pop != NULL || *s == '.')
464 * WARNING: c has next char, which may be end-of-line.
465 * We lookup the pseudo-op table with s+1 because we
466 * already know that the pseudo-op begins with a '.'.
470 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
472 /* Print the error msg now, while we still can */
475 as_bad ("Unknown pseudo-op: `%s'", s);
476 *input_line_pointer = c;
481 /* Put it back for error messages etc. */
482 *input_line_pointer = c;
483 /* The following skip of whitespace is compulsory.
484 A well shaped space is sometimes all that separates
485 keyword from operands. */
486 if (c == ' ' || c == '\t')
488 input_line_pointer++;
489 } /* Skip seperator after keyword. */
491 * Input_line is restored.
492 * Input_line_pointer->1st non-blank char
493 * after pseudo-operation.
497 ignore_rest_of_line ();
502 (*pop->poc_handler) (pop->poc_val);
503 } /* if we have one */
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[*input_line_pointer])
513 input_line_pointer++;
516 c = *input_line_pointer;
517 *input_line_pointer = '\0';
519 md_assemble (s); /* Assemble 1 instruction. */
521 *input_line_pointer++ = c;
523 /* We resume loop AFTER the end-of-line from this instruction */
528 } /* if (is_name_beginner(c) */
531 if (is_end_of_line[c])
534 } /* empty statement */
537 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
539 { /* local label ("4:") */
540 char *backup = input_line_pointer;
542 HANDLE_CONDITIONAL_ASSEMBLY ();
546 while (isdigit (*input_line_pointer))
548 temp = (temp * 10) + *input_line_pointer - '0';
549 ++input_line_pointer;
550 } /* read the whole number */
552 #ifdef LOCAL_LABELS_DOLLAR
553 if (*input_line_pointer == '$'
554 && *(input_line_pointer + 1) == ':')
556 input_line_pointer += 2;
558 if (dollar_label_defined (temp))
560 as_fatal ("label \"%d$\" redefined", temp);
563 define_dollar_label (temp);
564 colon (dollar_label_name (temp, 0));
567 #endif /* LOCAL_LABELS_DOLLAR */
569 #ifdef LOCAL_LABELS_FB
570 if (*input_line_pointer++ == ':')
572 fb_label_instance_inc (temp);
573 colon (fb_label_name (temp, 0));
576 #endif /* LOCAL_LABELS_FB */
578 input_line_pointer = backup;
579 } /* local label ("4:") */
580 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
582 if (c && strchr (line_comment_chars, c))
583 { /* Its a comment. Better say APP or NO_APP */
589 extern char *scrub_string, *scrub_last_string;
591 bump_line_counters ();
592 s = input_line_pointer;
593 if (strncmp (s, "APP\n", 4))
594 continue; /* We ignore it */
597 ends = strstr (s, "#NO_APP\n");
604 /* The end of the #APP wasn't in this buffer. We
605 keep reading in buffers until we find the #NO_APP
606 that goes with this #APP There is one. The specs
608 tmp_len = buffer_limit - s;
609 tmp_buf = xmalloc (tmp_len + 1);
610 memcpy (tmp_buf, s, tmp_len);
613 new_tmp = input_scrub_next_buffer (&buffer);
617 buffer_limit = new_tmp;
618 input_line_pointer = buffer;
619 ends = strstr (buffer, "#NO_APP\n");
623 num = buffer_limit - buffer;
625 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
626 memcpy (tmp_buf, buffer + tmp_len, num);
631 input_line_pointer = ends ? ends + 8 : NULL;
639 input_line_pointer = ends + 8;
641 new_buf = xmalloc (100);
646 scrub_last_string = ends;
651 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
655 if (new_tmp == new_buf + new_length)
657 new_buf = xrealloc (new_buf, new_length + 100);
658 new_tmp = new_buf + new_length;
666 old_input = input_line_pointer;
667 old_limit = buffer_limit;
669 input_line_pointer = new_buf;
670 buffer_limit = new_tmp;
674 HANDLE_CONDITIONAL_ASSEMBLY ();
676 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
677 input_line_pointer--; /* Report unknown char as ignored. */
678 ignore_rest_of_line ();
679 } /* while (input_line_pointer<buffer_limit) */
682 bump_line_counters ();
686 input_line_pointer = old_input;
687 buffer_limit = old_limit;
692 } /* while (more buffers to scan) */
693 input_scrub_close (); /* Close the input file */
695 } /* read_a_source_file() */
700 as_fatal (".abort detected. Abandoning ship.");
703 /* For machines where ".align 4" means align to a 4 byte boundary. */
708 register unsigned int temp;
709 register long temp_fill;
711 unsigned long max_alignment = 1 << 15;
713 if (is_end_of_line[*input_line_pointer])
714 temp = arg; /* Default value from pseudo-op table */
716 temp = get_absolute_expression ();
718 if (temp > max_alignment)
720 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
724 * For the sparc, `.align (1<<n)' actually means `.align n'
725 * so we have to convert it.
729 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
733 as_bad ("Alignment not a power of 2");
736 if (*input_line_pointer == ',')
738 input_line_pointer++;
739 temp_fill = get_absolute_expression ();
741 else if (now_seg != data_section && now_seg != bss_section)
742 temp_fill = NOP_OPCODE;
745 /* Only make a frag if we HAVE to. . . */
746 if (temp && !need_pass_2)
747 frag_align (temp, (int) temp_fill);
749 record_alignment (now_seg, temp);
751 demand_empty_rest_of_line ();
752 } /* s_align_bytes() */
754 /* For machines where ".align 4" means align to 2**4 boundary. */
759 register long temp_fill;
760 long max_alignment = 15;
762 temp = get_absolute_expression ();
763 if (temp > max_alignment)
764 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
767 as_bad ("Alignment negative. 0 assumed.");
770 if (*input_line_pointer == ',')
772 input_line_pointer++;
773 temp_fill = get_absolute_expression ();
775 /* @@ Fix this right for BFD! */
776 else if (now_seg != data_section && now_seg != bss_section)
777 temp_fill = NOP_OPCODE;
780 /* Only make a frag if we HAVE to. . . */
781 if (temp && !need_pass_2)
782 frag_align (temp, (int) temp_fill);
784 record_alignment (now_seg, temp);
786 demand_empty_rest_of_line ();
787 } /* s_align_ptwo() */
796 register symbolS *symbolP;
798 name = input_line_pointer;
799 c = get_symbol_end ();
800 /* just after name is now '\0' */
801 p = input_line_pointer;
804 if (*input_line_pointer != ',')
806 as_bad ("Expected comma after symbol-name: rest of line ignored.");
807 ignore_rest_of_line ();
810 input_line_pointer++; /* skip ',' */
811 if ((temp = get_absolute_expression ()) < 0)
813 as_warn (".COMMon length (%d.) <0! Ignored.", temp);
814 ignore_rest_of_line ();
818 symbolP = symbol_find_or_make (name);
820 if (S_IS_DEFINED (symbolP))
822 as_bad ("Ignoring attempt to re-define symbol");
823 ignore_rest_of_line ();
826 if (S_GET_VALUE (symbolP))
828 if (S_GET_VALUE (symbolP) != temp)
829 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
830 S_GET_NAME (symbolP),
831 S_GET_VALUE (symbolP),
836 S_SET_VALUE (symbolP, temp);
837 S_SET_EXTERNAL (symbolP);
840 if ( (!temp) || !flagseen['1'])
841 S_GET_OTHER(symbolP) = const_flag;
842 #endif /* not OBJ_VMS */
843 know (symbolP->sy_frag == &zero_address_frag);
844 demand_empty_rest_of_line ();
853 temp = get_absolute_expression ();
856 section = text_section;
860 section = data_section;
863 subseg_set (section, (subsegT) temp);
865 subseg_new (section, (subsegT) temp);
871 demand_empty_rest_of_line ();
874 /* Handle the .appfile pseudo-op. This is automatically generated by
875 do_scrub_next_char when a preprocessor # line comment is seen with
876 a file name. This default definition may be overridden by the
877 object or CPU specific pseudo-ops. This function is also the
878 default definition for .file; the APPFILE argument is 1 for
879 .appfile, 0 for .file. */
888 /* Some assemblers tolerate immediately following '"' */
889 if ((s = demand_copy_string (&length)) != 0)
891 /* If this is a fake .appfile, a fake newline was inserted into
892 the buffer. Passing -2 to new_logical_line tells it to
894 new_logical_line (s, appfile ? -2 : -1);
895 demand_empty_rest_of_line ();
898 listing_source_file (s);
902 c_dot_file_symbol (s);
903 #endif /* OBJ_COFF */
909 /* Handle the .appline pseudo-op. This is automatically generated by
910 do_scrub_next_char when a preprocessor # line comment is seen.
911 This default definition may be overridden by the object or CPU
912 specific pseudo-ops. */
919 /* The given number is that of the next line. */
920 l = get_absolute_expression () - 1;
921 new_logical_line ((char *) NULL, l);
924 listing_source_line (l);
926 demand_empty_rest_of_line ();
932 long temp_repeat = 0;
934 register long temp_fill = 0;
938 temp_repeat = get_absolute_expression ();
939 if (*input_line_pointer == ',')
941 input_line_pointer++;
942 temp_size = get_absolute_expression ();
943 if (*input_line_pointer == ',')
945 input_line_pointer++;
946 temp_fill = get_absolute_expression ();
949 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
950 #define BSD_FILL_SIZE_CROCK_8 (8)
951 if (temp_size > BSD_FILL_SIZE_CROCK_8)
953 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
954 temp_size = BSD_FILL_SIZE_CROCK_8;
958 as_warn ("Size negative: .fill ignored.");
961 else if (temp_repeat <= 0)
963 as_warn ("Repeat < 0, .fill ignored");
967 if (temp_size && !need_pass_2)
969 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
970 memset (p, 0, (int) temp_size);
971 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
972 * flavoured AS. The following bizzare behaviour is to be
973 * compatible with above. I guess they tried to take up to 8
974 * bytes from a 4-byte expression and they forgot to sign
975 * extend. Un*x Sux. */
976 #define BSD_FILL_SIZE_CROCK_4 (4)
977 md_number_to_chars (p, temp_fill,
978 (temp_size > BSD_FILL_SIZE_CROCK_4
979 ? BSD_FILL_SIZE_CROCK_4
981 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
982 * but emits no error message because it seems a legal thing to do.
983 * It is a degenerate case of .fill but could be emitted by a compiler.
986 demand_empty_rest_of_line ();
998 name = input_line_pointer;
999 c = get_symbol_end ();
1000 symbolP = symbol_find_or_make (name);
1001 *input_line_pointer = c;
1003 S_SET_EXTERNAL (symbolP);
1006 input_line_pointer++;
1008 if (*input_line_pointer == '\n')
1013 demand_empty_rest_of_line ();
1017 s_lcomm (needs_align)
1018 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1019 (alignment); 0 if it was an ".lcomm" (2 args only) */
1022 register char *name;
1026 register symbolS *symbolP;
1027 segT current_seg = now_seg;
1028 subsegT current_subseg = now_subseg;
1029 const int max_alignment = 15;
1031 segT bss_seg = bss_section;
1033 name = input_line_pointer;
1034 c = get_symbol_end ();
1035 p = input_line_pointer;
1038 if (*input_line_pointer != ',')
1040 as_bad ("Expected comma after name");
1041 ignore_rest_of_line ();
1045 ++input_line_pointer;
1047 if (*input_line_pointer == '\n')
1049 as_bad ("Missing size expression");
1053 if ((temp = get_absolute_expression ()) < 0)
1055 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1056 ignore_rest_of_line ();
1062 /* For MIPS ECOFF, small objects are put in .sbss. */
1063 if (temp <= bfd_get_gp_size (stdoutput))
1064 bss_seg = subseg_new (".sbss", 1);
1072 if (*input_line_pointer != ',')
1074 as_bad ("Expected comma after size");
1075 ignore_rest_of_line ();
1078 input_line_pointer++;
1080 if (*input_line_pointer == '\n')
1082 as_bad ("Missing alignment");
1085 align = get_absolute_expression ();
1086 if (align > max_alignment)
1088 align = max_alignment;
1089 as_warn ("Alignment too large: %d. assumed.", align);
1094 as_warn ("Alignment negative. 0 assumed.");
1096 record_alignment (bss_seg, align);
1097 } /* if needs align */
1100 symbolP = symbol_find_or_make (name);
1104 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1105 S_GET_OTHER (symbolP) == 0 &&
1106 S_GET_DESC (symbolP) == 0 &&
1107 #endif /* OBJ_AOUT or OBJ_BOUT */
1108 (S_GET_SEGMENT (symbolP) == bss_seg
1109 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1113 #ifdef BFD_ASSEMBLER
1114 subseg_set (bss_seg, 1);
1116 subseg_new (bss_seg, 1);
1120 frag_align (align, 0);
1121 /* detach from old frag */
1122 if (S_GET_SEGMENT (symbolP) == bss_seg)
1123 symbolP->sy_frag->fr_symbol = NULL;
1125 symbolP->sy_frag = frag_now;
1126 p = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1130 S_SET_SEGMENT (symbolP, bss_seg);
1133 /* The symbol may already have been created with a preceding
1134 ".globl" directive -- be careful not to step on storage class
1135 in that case. Otherwise, set it to static. */
1136 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1138 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1140 #endif /* OBJ_COFF */
1144 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1147 #ifdef BFD_ASSEMBLER
1148 subseg_set (current_seg, current_subseg);
1150 subseg_new (current_seg, current_subseg);
1153 demand_empty_rest_of_line ();
1171 register char *name;
1175 register symbolS *symbolP;
1177 /* we permit ANY defined expression: BSD4.2 demands constants */
1178 name = input_line_pointer;
1179 c = get_symbol_end ();
1180 p = input_line_pointer;
1183 if (*input_line_pointer != ',')
1186 as_bad ("Expected comma after name \"%s\"", name);
1188 ignore_rest_of_line ();
1191 input_line_pointer++;
1193 if (exp.X_op != O_constant
1194 && exp.X_op != O_register)
1196 as_bad ("bad expression");
1197 ignore_rest_of_line ();
1201 symbolP = symbol_find_or_make (name);
1203 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1204 symbolP->sy_desc == 0) out of this test because coff doesn't have
1205 those fields, and I can't see when they'd ever be tripped. I
1206 don't think I understand why they were here so I may have
1207 introduced a bug. As recently as 1.37 didn't have this test
1208 anyway. xoxorich. */
1210 if (S_GET_SEGMENT (symbolP) == undefined_section
1211 && S_GET_VALUE (symbolP) == 0)
1213 /* The name might be an undefined .global symbol; be sure to
1214 keep the "external" bit. */
1215 S_SET_SEGMENT (symbolP,
1216 (exp.X_op == O_constant
1219 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1223 as_bad ("Symbol %s already defined", name);
1226 demand_empty_rest_of_line ();
1232 register segT segment;
1234 register long temp_fill;
1236 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1237 thing as a sub-segment-relative origin. Any absolute origin is
1238 given a warning, then assumed to be segment-relative. Any
1239 segmented origin expression ("foo+42") had better be in the right
1240 segment or the .org is ignored.
1242 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1243 we never know sub-segment sizes when we are reading code. BSD
1244 will crash trying to emit negative numbers of filler bytes in
1245 certain .orgs. We don't crash, but see as-write for that code.
1247 Don't make frag if need_pass_2==1. */
1248 segment = get_known_segmented_expression (&exp);
1249 if (*input_line_pointer == ',')
1251 input_line_pointer++;
1252 temp_fill = get_absolute_expression ();
1258 if (segment != now_seg && segment != absolute_section)
1259 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1260 segment_name (segment), segment_name (now_seg));
1261 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1262 exp.X_add_number, (char *) 0);
1264 } /* if (ok to make frag) */
1265 demand_empty_rest_of_line ();
1271 register char *name;
1272 register char delim;
1273 register char *end_name;
1274 register symbolS *symbolP;
1277 * Especial apologies for the random logic:
1278 * this just grew, and could be parsed much more simply!
1281 name = input_line_pointer;
1282 delim = get_symbol_end ();
1283 end_name = input_line_pointer;
1287 if (*input_line_pointer != ',')
1290 as_bad ("Expected comma after name \"%s\"", name);
1292 ignore_rest_of_line ();
1296 input_line_pointer++;
1299 if (name[0] == '.' && name[1] == '\0')
1301 /* Turn '. = mumble' into a .org mumble */
1302 register segT segment;
1306 segment = get_known_segmented_expression (&exp);
1310 if (segment != now_seg && segment != absolute_section)
1311 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1312 segment_name (segment),
1313 segment_name (now_seg));
1314 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1315 exp.X_add_number, (char *) 0);
1317 } /* if (ok to make frag) */
1323 if ((symbolP = symbol_find (name)) == NULL
1324 && (symbolP = md_undefined_symbol (name)) == NULL)
1326 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1328 /* "set" symbols are local unless otherwise specified. */
1329 SF_SET_LOCAL (symbolP);
1330 #endif /* OBJ_COFF */
1332 } /* make a new symbol */
1334 symbol_table_insert (symbolP);
1337 pseudo_set (symbolP);
1338 demand_empty_rest_of_line ();
1346 register long temp_fill;
1349 /* Just like .fill, but temp_size = 1 */
1350 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1352 temp_fill = get_absolute_expression ();
1356 input_line_pointer--; /* Backup over what was not a ','. */
1361 temp_repeat *= mult;
1363 if (temp_repeat <= 0)
1365 as_warn ("Repeat < 0, .space ignored");
1366 ignore_rest_of_line ();
1371 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1372 temp_repeat, (char *) 0);
1375 demand_empty_rest_of_line ();
1383 temp = get_absolute_expression ();
1384 #ifdef BFD_ASSEMBLER
1385 subseg_set (text_section, (subsegT) temp);
1387 subseg_new (text_section, (subsegT) temp);
1389 demand_empty_rest_of_line ();
1394 demand_empty_rest_of_line ()
1397 if (is_end_of_line[*input_line_pointer])
1399 input_line_pointer++;
1403 ignore_rest_of_line ();
1405 /* Return having already swallowed end-of-line. */
1406 } /* Return pointing just after end-of-line. */
1409 ignore_rest_of_line () /* For suspect lines: gives warning. */
1411 if (!is_end_of_line[*input_line_pointer])
1413 if (isprint (*input_line_pointer))
1414 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1415 *input_line_pointer);
1417 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1418 *input_line_pointer);
1419 while (input_line_pointer < buffer_limit
1420 && !is_end_of_line[*input_line_pointer])
1422 input_line_pointer++;
1425 input_line_pointer++; /* Return pointing just after end-of-line. */
1426 know (is_end_of_line[input_line_pointer[-1]]);
1432 * In: Pointer to a symbol.
1433 * Input_line_pointer->expression.
1435 * Out: Input_line_pointer->just after any whitespace after expression.
1436 * Tried to set symbol to value of expression.
1437 * Will change symbols type, value, and frag;
1440 pseudo_set (symbolP)
1444 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1446 #endif /* OBJ_AOUT or OBJ_BOUT */
1448 know (symbolP); /* NULL pointer is logic error. */
1449 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1450 /* @@ Fix this right for BFD. */
1451 ext = S_IS_EXTERNAL (symbolP);
1452 #endif /* OBJ_AOUT or OBJ_BOUT */
1454 (void) expression (&exp);
1456 if (exp.X_op == O_illegal)
1457 as_bad ("illegal expression; zero assumed");
1458 else if (exp.X_op == O_absent)
1459 as_bad ("missing expression; zero assumed");
1460 else if (exp.X_op == O_big)
1461 as_bad ("%s number invalid; zero assumed",
1462 exp.X_add_number > 0 ? "bignum" : "floating point");
1463 else if (exp.X_op == O_subtract
1464 && (S_GET_SEGMENT (exp.X_add_symbol)
1465 == S_GET_SEGMENT (exp.X_op_symbol))
1466 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1467 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1469 exp.X_op = O_constant;
1470 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1471 - S_GET_VALUE (exp.X_op_symbol));
1479 exp.X_add_number = 0;
1482 S_SET_SEGMENT (symbolP, absolute_section);
1483 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1484 /* @@ Fix this right for BFD. */
1486 S_SET_EXTERNAL (symbolP);
1488 S_CLEAR_EXTERNAL (symbolP);
1489 #endif /* OBJ_AOUT or OBJ_BOUT */
1490 S_SET_VALUE (symbolP, exp.X_add_number);
1491 symbolP->sy_frag = &zero_address_frag;
1495 S_SET_SEGMENT (symbolP, reg_section);
1496 S_SET_VALUE (symbolP, exp.X_add_number);
1497 symbolP->sy_frag = &zero_address_frag;
1501 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1502 symbolP->sy_value = exp;
1505 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1506 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1507 /* @@ Fix this right for BFD! */
1509 S_SET_EXTERNAL (symbolP);
1511 S_CLEAR_EXTERNAL (symbolP);
1512 #endif /* OBJ_AOUT or OBJ_BOUT */
1513 S_SET_VALUE (symbolP,
1514 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1515 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1520 /* The value is some complex expression.
1521 FIXME: Should we set the segment to anything? */
1522 symbolP->sy_value = exp;
1530 * CONStruct more frag of .bytes, or .words etc.
1531 * Should need_pass_2 be 1 then emit no frag(s).
1532 * This understands EXPRESSIONS, as opposed to big_cons().
1536 * This has a split personality. We use expression() to read the
1537 * value. We can detect if the value won't fit in a byte or word.
1538 * But we can't detect if expression() discarded significant digits
1539 * in the case of a long. Not worth the crocks required to fix it.
1542 /* Select a parser for cons expressions. */
1544 /* Some targets need to parse the expression in various fancy ways.
1545 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1546 (for example, the HPPA does this). Otherwise, you can define
1547 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1548 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1549 are defined, which is the normal case, then only simple expressions
1552 #ifndef TC_PARSE_CONS_EXPRESSION
1553 #ifdef BITFIELD_CONS_EXPRESSIONS
1554 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1556 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1559 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1561 parse_mri_cons PARAMS ((expressionS *exp));
1563 #ifdef REPEAT_CONS_EXPRESSIONS
1564 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1566 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1569 /* If we haven't gotten one yet, just call expression. */
1570 #ifndef TC_PARSE_CONS_EXPRESSION
1571 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1575 /* worker to do .byte etc statements */
1576 /* clobbers input_line_pointer, checks */
1580 register unsigned int nbytes; /* 1=.byte, 2=.word, 4=.long */
1584 if (is_it_end_of_statement ())
1586 demand_empty_rest_of_line ();
1592 TC_PARSE_CONS_EXPRESSION (&exp, nbytes);
1593 emit_expr (&exp, nbytes);
1595 while (*input_line_pointer++ == ',');
1597 input_line_pointer--; /* Put terminator back into stream. */
1598 demand_empty_rest_of_line ();
1601 /* Put the contents of expression EXP into the object file using
1602 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1605 emit_expr (exp, nbytes)
1607 unsigned int nbytes;
1612 /* Don't do anything if we are going to make another pass. */
1618 if (op == O_absent || op == O_illegal)
1620 as_warn ("zero assumed for missing expression");
1621 exp->X_add_number = 0;
1624 else if (op == O_big)
1626 as_bad ("%s number invalid; zero assumed",
1627 exp->X_add_number > 0 ? "bignum" : "floating point");
1628 exp->X_add_number = 0;
1631 else if (op == O_register)
1633 as_warn ("register value used as expression");
1637 p = frag_more (nbytes);
1639 #ifndef WORKING_DOT_WORD
1640 /* If we have the difference of two symbols in a word, save it on
1641 the broken_words list. See the code in write.c. */
1642 if (op == O_subtract && nbytes == 2)
1644 struct broken_word *x;
1646 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1647 x->next_broken_word = broken_words;
1650 x->word_goes_here = p;
1652 x->add = exp->X_add_symbol;
1653 x->sub = exp->X_op_symbol;
1654 x->addnum = exp->X_add_number;
1661 if (op == O_constant)
1666 register long unmask;
1668 /* JF << of >= number of bits in the object is undefined. In
1669 particular SPARC (Sun 4) has problems */
1670 if (nbytes >= sizeof (long))
1673 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1675 unmask = ~mask; /* Do store these bits. */
1678 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1679 mask = ~(unmask >> 1); /* Includes sign bit now. */
1682 get = exp->X_add_number;
1684 if ((get & mask) != 0 && (get & mask) != mask)
1685 { /* Leading bits contain both 0s & 1s. */
1686 as_warn ("Value 0x%x truncated to 0x%x.", get, use);
1688 md_number_to_chars (p, use, nbytes); /* put bytes in right order. */
1692 md_number_to_chars (p, (long) 0, nbytes);
1694 /* Now we need to generate a fixS to record the symbol value.
1695 This is easy for BFD. For other targets it can be more
1696 complex. For very complex cases (currently, the HPPA and
1697 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1698 want. For simpler cases, you can define TC_CONS_RELOC to be
1699 the name of the reloc code that should be stored in the fixS.
1700 If neither is defined, the code uses NO_RELOC if it is
1701 defined, and otherwise uses 0. */
1703 #ifdef BFD_ASSEMBLER
1704 fix_new_exp (frag_now, p - frag_now->fr_literal, nbytes, exp, 0,
1705 /* @@ Should look at CPU word size. */
1706 nbytes == 2 ? BFD_RELOC_16
1707 : nbytes == 8 ? BFD_RELOC_64
1710 #ifdef TC_CONS_FIX_NEW
1711 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1713 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1714 it is defined, otherwise use NO_RELOC if it is defined,
1716 #ifndef TC_CONS_RELOC
1718 #define TC_CONS_RELOC NO_RELOC
1720 #define TC_CONS_RELOC 0
1723 fix_new_exp (frag_now, p - frag_now->fr_literal, nbytes, exp, 0,
1725 #endif /* TC_CONS_FIX_NEW */
1726 #endif /* BFD_ASSEMBLER */
1730 #ifdef BITFIELD_CONS_EXPRESSIONS
1732 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1733 w:x,y:z, where w and y are bitwidths and x and y are values. They
1734 then pack them all together. We do a little better in that we allow
1735 them in words, longs, etc. and we'll pack them in target byte order
1738 The rules are: pack least significat bit first, if a field doesn't
1739 entirely fit, put it in the next unit. Overflowing the bitfield is
1740 explicitly *not* even a warning. The bitwidth should be considered
1743 To use this function the tc-XXX.h file should define
1744 BITFIELD_CONS_EXPRESSIONS. */
1747 parse_bitfield_cons (exp, nbytes)
1749 unsigned int nbytes;
1751 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1752 char *hold = input_line_pointer;
1754 (void) expression (exp);
1756 if (*input_line_pointer == ':')
1762 unsigned long width;
1764 if (*input_line_pointer != ':')
1766 input_line_pointer = hold;
1768 } /* next piece is not a bitfield */
1770 /* In the general case, we can't allow
1771 full expressions with symbol
1772 differences and such. The relocation
1773 entries for symbols not defined in this
1774 assembly would require arbitrary field
1775 widths, positions, and masks which most
1776 of our current object formats don't
1779 In the specific case where a symbol
1780 *is* defined in this assembly, we
1781 *could* build fixups and track it, but
1782 this could lead to confusion for the
1783 backends. I'm lazy. I'll take any
1784 SEG_ABSOLUTE. I think that means that
1785 you can use a previous .set or
1786 .equ type symbol. xoxorich. */
1788 if (exp->X_op == O_absent)
1790 as_warn ("using a bit field width of zero");
1791 exp->X_add_number = 0;
1792 exp->X_op = O_constant;
1793 } /* implied zero width bitfield */
1795 if (exp->X_op != O_constant)
1797 *input_line_pointer = '\0';
1798 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1799 *input_line_pointer = ':';
1800 demand_empty_rest_of_line ();
1804 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1806 as_warn ("field width %d too big to fit in %d bytes: truncated to %d bits",
1807 width, nbytes, (BITS_PER_CHAR * nbytes));
1808 width = BITS_PER_CHAR * nbytes;
1811 if (width > bits_available)
1813 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1814 input_line_pointer = hold;
1815 exp->X_add_number = value;
1819 hold = ++input_line_pointer; /* skip ':' */
1821 (void) expression (exp);
1822 if (exp->X_op != O_constant)
1824 char cache = *input_line_pointer;
1826 *input_line_pointer = '\0';
1827 as_bad ("field value \"%s\" too complex for a bitfield", hold);
1828 *input_line_pointer = cache;
1829 demand_empty_rest_of_line ();
1833 value |= ((~(-1 << width) & exp->X_add_number)
1834 << ((BITS_PER_CHAR * nbytes) - bits_available));
1836 if ((bits_available -= width) == 0
1837 || is_it_end_of_statement ()
1838 || *input_line_pointer != ',')
1841 } /* all the bitfields we're gonna get */
1843 hold = ++input_line_pointer;
1844 (void) expression (exp);
1845 } /* forever loop */
1847 exp->X_add_number = value;
1848 exp->X_op = O_constant;
1849 } /* if looks like a bitfield */
1850 } /* parse_bitfield_cons() */
1852 #endif /* BITFIELD_CONS_EXPRESSIONS */
1857 parse_mri_cons (exp, nbytes)
1859 unsigned int nbytes;
1861 if (*input_line_pointer == '\'')
1863 /* An MRI style string, cut into as many bytes as will fit into
1864 a nbyte chunk, left justify if necessary, and separate with
1865 commas so we can try again later */
1867 unsigned int result = 0;
1868 input_line_pointer++;
1869 for (scan = 0; scan < nbytes; scan++)
1871 if (*input_line_pointer == '\'')
1873 if (input_line_pointer[1] == '\'')
1875 input_line_pointer++;
1880 result = (result << 8) | (*input_line_pointer++);
1884 while (scan < nbytes)
1889 /* Create correct expression */
1890 exp->X_op = O_constant;
1891 exp->X_add_number = result;
1892 /* Fake it so that we can read the next char too */
1893 if (input_line_pointer[0] != '\'' ||
1894 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
1896 input_line_pointer -= 2;
1897 input_line_pointer[0] = ',';
1898 input_line_pointer[1] = '\'';
1901 input_line_pointer++;
1909 #ifdef REPEAT_CONS_EXPRESSIONS
1911 /* Parse a repeat expression for cons. This is used by the MIPS
1912 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1913 object file COUNT times.
1915 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1918 parse_repeat_cons (exp, nbytes)
1920 unsigned int nbytes;
1927 if (*input_line_pointer != ':')
1929 /* No repeat count. */
1933 ++input_line_pointer;
1934 expression (&count);
1935 if (count.X_op != O_constant
1936 || count.X_add_number <= 0)
1938 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1942 /* The cons function is going to output this expression once. So we
1943 output it count - 1 times. */
1944 for (i = count.X_add_number - 1; i > 0; i--)
1945 emit_expr (exp, nbytes);
1948 #endif /* REPEAT_CONS_EXPRESSIONS */
1953 * CONStruct more frag(s) of .quads, or .octa etc.
1954 * Makes 0 or more new frags.
1955 * If need_pass_2 == 1, generate no frag.
1956 * This understands only bignums, not expressions. Cons() understands
1959 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
1961 * This creates objects with struct obstack_control objs, destroying
1962 * any context objs held about a partially completed object. Beware!
1965 * I think it sucks to have 2 different types of integers, with 2
1966 * routines to read them, store them etc.
1967 * It would be nicer to permit bignums in expressions and only
1968 * complain if the result overflowed. However, due to "efficiency"...
1970 /* Worker to do .quad etc statements. Clobbers input_line_pointer, checks
1971 end-of-line. 8=.quad 16=.octa ... */
1975 register int nbytes;
1977 register char c; /* input_line_pointer->c. */
1979 register long length; /* Number of chars in an object. */
1980 register int digit; /* Value of 1 digit. */
1981 register int carry; /* For multi-precision arithmetic. */
1982 register int work; /* For multi-precision arithmetic. */
1983 register char *p; /* For multi-precision arithmetic. */
1985 extern const char hex_value[]; /* In hex_value.c. */
1988 * The following awkward logic is to parse ZERO or more strings,
1989 * comma seperated. Recall an expression includes its leading &
1990 * trailing blanks. We fake a leading ',' if there is (supposed to
1991 * be) a 1st expression, and keep demanding 1 expression for each ','.
1993 if (is_it_end_of_statement ())
1995 c = 0; /* Skip loop. */
1999 c = ','; /* Do loop. */
2000 --input_line_pointer;
2004 ++input_line_pointer;
2006 c = *input_line_pointer;
2007 /* C contains 1st non-blank character of what we hope is a number. */
2010 c = *++input_line_pointer;
2011 if (c == 'x' || c == 'X')
2013 c = *++input_line_pointer;
2026 * This feature (?) is here to stop people worrying about
2027 * mysterious zero constants: which is what they get when
2028 * they completely omit digits.
2030 if (hex_value[c] >= radix)
2032 as_bad ("Missing digits. 0 assumed.");
2034 bignum_high = bignum_low - 1; /* Start constant with 0 chars. */
2035 for (; (digit = hex_value[c]) < radix; c = *++input_line_pointer)
2037 /* Multiply existing number by radix, then add digit. */
2039 for (p = bignum_low; p <= bignum_high; p++)
2041 work = (*p & MASK_CHAR) * radix + carry;
2042 *p = work & MASK_CHAR;
2043 carry = work >> BITS_PER_CHAR;
2048 *bignum_high = carry & MASK_CHAR;
2049 know ((carry & ~MASK_CHAR) == 0);
2052 length = bignum_high - bignum_low + 1;
2053 if (length > nbytes)
2055 as_warn ("Most significant bits truncated in integer constant.");
2059 register long leading_zeroes;
2061 for (leading_zeroes = nbytes - length;
2071 char *src = bignum_low;
2072 p = frag_more (nbytes);
2073 if (target_big_endian)
2076 for (i = nbytes - 1; i >= 0; i--)
2080 memcpy (p, bignum_low, (int) nbytes);
2082 /* C contains character after number. */
2084 c = *input_line_pointer;
2085 /* C contains 1st non-blank character after number. */
2087 demand_empty_rest_of_line ();
2090 /* Extend bignum by 1 char. */
2094 register long length;
2097 if (bignum_high >= bignum_limit)
2099 length = bignum_limit - bignum_low;
2100 bignum_low = xrealloc (bignum_low, length + length);
2101 bignum_high = bignum_low + length;
2102 bignum_limit = bignum_low + length + length;
2104 } /* grow_bignum(); */
2109 * CONStruct some more frag chars of .floats .ffloats etc.
2110 * Makes 0 or more new frags.
2111 * If need_pass_2 == 1, no frags are emitted.
2112 * This understands only floating literals, not expressions. Sorry.
2114 * A floating constant is defined by atof_generic(), except it is preceded
2115 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2116 * reading, I decided to be incompatible. This always tries to give you
2117 * rounded bits to the precision of the pseudo-op. Former AS did premature
2118 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2119 * a choice of 2 flavours of noise according to which of 2 floating-point
2120 * scanners you directed AS to use.
2122 * In: input_line_pointer->whitespace before, or '0' of flonum.
2127 float_cons (float_type)
2128 /* Clobbers input_line-pointer, checks end-of-line. */
2129 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2132 int length; /* Number of chars in an object. */
2133 register char *err; /* Error from scanning floating literal. */
2134 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2136 if (is_it_end_of_statement ())
2138 demand_empty_rest_of_line ();
2144 /* input_line_pointer->1st char of a flonum (we hope!). */
2147 /* Skip any 0{letter} that may be present. Don't even check if the
2148 * letter is legal. Someone may invent a "z" format and this routine
2149 * has no use for such information. Lusers beware: you get
2150 * diagnostics if your input is ill-conditioned.
2152 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2153 input_line_pointer += 2;
2155 err = md_atof (float_type, temp, &length);
2156 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2160 as_bad ("Bad floating literal: %s", err);
2161 ignore_rest_of_line ();
2171 #ifdef REPEAT_CONS_EXPRESSIONS
2172 if (*input_line_pointer == ':')
2174 expressionS count_exp;
2176 ++input_line_pointer;
2177 expression (&count_exp);
2178 if (count_exp.X_op != O_constant
2179 || count_exp.X_add_number <= 0)
2181 as_warn ("unresolvable or nonpositive repeat count; using 1");
2184 count = count_exp.X_add_number;
2188 while (--count >= 0)
2190 p = frag_more (length);
2191 memcpy (p, temp, length);
2196 while (*input_line_pointer++ == ',');
2198 --input_line_pointer; /* Put terminator back into stream. */
2199 demand_empty_rest_of_line ();
2200 } /* float_cons() */
2205 * We read 0 or more ',' seperated, double-quoted strings.
2207 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2212 stringer (append_zero) /* Worker to do .ascii etc statements. */
2213 /* Checks end-of-line. */
2214 register int append_zero; /* 0: don't append '\0', else 1 */
2216 register unsigned int c;
2219 * The following awkward logic is to parse ZERO or more strings,
2220 * comma seperated. Recall a string expression includes spaces
2221 * before the opening '\"' and spaces after the closing '\"'.
2222 * We fake a leading ',' if there is (supposed to be)
2223 * a 1st, expression. We keep demanding expressions for each
2226 if (is_it_end_of_statement ())
2228 c = 0; /* Skip loop. */
2229 ++input_line_pointer; /* Compensate for end of loop. */
2233 c = ','; /* Do loop. */
2235 while (c == ',' || c == '<' || c == '"')
2238 switch (*input_line_pointer)
2241 ++input_line_pointer; /*->1st char of string. */
2242 while (is_a_char (c = next_char_of_string ()))
2244 FRAG_APPEND_1_CHAR (c);
2248 FRAG_APPEND_1_CHAR (0);
2250 know (input_line_pointer[-1] == '\"');
2253 input_line_pointer++;
2254 c = get_single_number ();
2255 FRAG_APPEND_1_CHAR (c);
2256 if (*input_line_pointer != '>')
2258 as_bad ("Expected <nn>");
2260 input_line_pointer++;
2263 input_line_pointer++;
2267 c = *input_line_pointer;
2270 demand_empty_rest_of_line ();
2273 /* FIXME-SOMEDAY: I had trouble here on characters with the
2274 high bits set. We'll probably also have trouble with
2275 multibyte chars, wide chars, etc. Also be careful about
2276 returning values bigger than 1 byte. xoxorich. */
2279 next_char_of_string ()
2281 register unsigned int c;
2283 c = *input_line_pointer++ & CHAR_MASK;
2291 switch (c = *input_line_pointer++)
2321 break; /* As itself. */
2336 for (number = 0; isdigit (c); c = *input_line_pointer++)
2338 number = number * 8 + c - '0';
2342 --input_line_pointer;
2346 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2347 as_warn ("Unterminated string: Newline inserted.");
2353 #ifdef ONLY_STANDARD_ESCAPES
2354 as_bad ("Bad escaped character in string, '?' assumed");
2356 #endif /* ONLY_STANDARD_ESCAPES */
2359 } /* switch on escaped char */
2364 } /* switch on char */
2366 } /* next_char_of_string() */
2369 get_segmented_expression (expP)
2370 register expressionS *expP;
2372 register segT retval;
2374 retval = expression (expP);
2375 if (expP->X_op == O_illegal
2376 || expP->X_op == O_absent
2377 || expP->X_op == O_big)
2379 as_bad ("expected address expression; zero assumed");
2380 expP->X_op = O_constant;
2381 expP->X_add_number = 0;
2382 retval = absolute_section;
2388 get_known_segmented_expression (expP)
2389 register expressionS *expP;
2391 register segT retval;
2393 if ((retval = get_segmented_expression (expP)) == undefined_section)
2395 /* There is no easy way to extract the undefined symbol from the
2397 if (expP->X_add_symbol != NULL
2398 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2399 as_warn ("symbol \"%s\" undefined; zero assumed",
2400 S_GET_NAME (expP->X_add_symbol));
2402 as_warn ("some symbol undefined; zero assumed");
2403 retval = absolute_section;
2404 expP->X_op = O_constant;
2405 expP->X_add_number = 0;
2407 know (retval == absolute_section || SEG_NORMAL (retval));
2409 } /* get_known_segmented_expression() */
2411 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2412 get_absolute_expression ()
2417 if (exp.X_op != O_constant)
2419 if (exp.X_op != O_absent)
2420 as_bad ("bad absolute expression; zero assumed");
2421 exp.X_add_number = 0;
2423 return exp.X_add_number;
2426 char /* return terminator */
2427 get_absolute_expression_and_terminator (val_pointer)
2428 long *val_pointer; /* return value of expression */
2430 *val_pointer = get_absolute_expression ();
2431 return (*input_line_pointer++);
2435 * demand_copy_C_string()
2437 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2438 * Give a warning if that happens.
2441 demand_copy_C_string (len_pointer)
2446 if ((s = demand_copy_string (len_pointer)) != 0)
2450 for (len = *len_pointer;
2459 as_bad ("This string may not contain \'\\0\'");
2467 * demand_copy_string()
2469 * Demand string, but return a safe (=private) copy of the string.
2470 * Return NULL if we can't read a string here.
2473 demand_copy_string (lenP)
2476 register unsigned int c;
2482 if (*input_line_pointer == '\"')
2484 input_line_pointer++; /* Skip opening quote. */
2486 while (is_a_char (c = next_char_of_string ()))
2488 obstack_1grow (¬es, c);
2491 /* JF this next line is so demand_copy_C_string will return a null
2492 termanated string. */
2493 obstack_1grow (¬es, '\0');
2494 retval = obstack_finish (¬es);
2498 as_warn ("Missing string");
2500 ignore_rest_of_line ();
2504 } /* demand_copy_string() */
2507 * is_it_end_of_statement()
2509 * In: Input_line_pointer->next character.
2511 * Do: Skip input_line_pointer over all whitespace.
2513 * Out: 1 if input_line_pointer->end-of-line.
2516 is_it_end_of_statement ()
2519 return (is_end_of_line[*input_line_pointer]);
2520 } /* is_it_end_of_statement() */
2526 register symbolS *symbolP; /* symbol we are working with */
2528 input_line_pointer++;
2529 if (*input_line_pointer == '=')
2530 input_line_pointer++;
2532 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2533 input_line_pointer++;
2535 if (sym_name[0] == '.' && sym_name[1] == '\0')
2537 /* Turn '. = mumble' into a .org mumble */
2538 register segT segment;
2542 segment = get_known_segmented_expression (&exp);
2545 if (segment != now_seg && segment != absolute_section)
2546 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2547 segment_name (segment),
2548 segment_name (now_seg));
2549 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2550 exp.X_add_number, (char *) 0);
2552 } /* if (ok to make frag) */
2556 symbolP = symbol_find_or_make (sym_name);
2557 pseudo_set (symbolP);
2561 /* .include -- include a file at this point. */
2574 filename = demand_copy_string (&i);
2575 demand_empty_rest_of_line ();
2576 path = xmalloc (i + include_dir_maxlen + 5 /* slop */ );
2577 for (i = 0; i < include_dir_count; i++)
2579 strcpy (path, include_dirs[i]);
2581 strcat (path, filename);
2582 if (0 != (try = fopen (path, "r")))
2591 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2592 newbuf = input_scrub_include_file (path, input_line_pointer);
2593 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2597 add_include_dir (path)
2602 if (include_dir_count == 0)
2604 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2605 include_dirs[0] = "."; /* Current dir */
2606 include_dir_count = 2;
2610 include_dir_count++;
2611 include_dirs = (char **) realloc (include_dirs,
2612 include_dir_count * sizeof (*include_dirs));
2615 include_dirs[include_dir_count - 1] = path; /* New one */
2618 if (i > include_dir_maxlen)
2619 include_dir_maxlen = i;
2620 } /* add_include_dir() */
2626 while (!is_end_of_line[*input_line_pointer])
2628 ++input_line_pointer;
2630 ++input_line_pointer;