1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991, 1993 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
22 change this a bit. But then, GNU isn't
23 spozed to run on your machine anyway.
24 (RMS is so shortsighted sometimes.)
27 #define MASK_CHAR ((int)(unsigned char)-1)
31 /* This is the largest known floating point format (for now). It will
32 grow when we do 4361 style flonums. */
34 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
36 /* Routines that read assembler source text to build spagetti in memory.
37 Another group of these functions is in the expr.c module. */
51 #ifndef TC_START_LABEL
52 #define TC_START_LABEL(x,y) (x==':')
55 /* The NOP_OPCODE is for the alignment fill value.
56 * fill it a nop instruction so that the disassembler does not choke
60 #define NOP_OPCODE 0x00
63 char *input_line_pointer; /*->next char of source file to parse. */
65 #if BITS_PER_CHAR != 8
66 /* The following table is indexed by[(char)] and will break if
67 a char does not have exactly 256 states (hopefully 0:255!)! */
72 /* The m88k unfortunately uses @ as a label beginner. */
76 /* used by is_... macros. our ctype[] */
77 const char lex_type[256] =
79 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
80 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
81 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
82 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
83 LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
84 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
85 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
86 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
91 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99 * Out: 1 if this character ends a line.
102 char is_end_of_line[256] =
105 _, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
107 _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
109 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
111 _,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
112 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
114 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
115 _, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
117 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
118 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
119 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
120 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
121 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
122 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
123 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
124 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
125 _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
129 /* Functions private to this file. */
131 static char *buffer; /* 1st char of each buffer of lines is here. */
132 static char *buffer_limit; /*->1 + last char in buffer. */
134 static char *bignum_low; /* Lowest char of bignum. */
135 static char *bignum_limit; /* 1st illegal address of bignum. */
136 static char *bignum_high; /* Highest char of bignum. */
137 /* May point to (bignum_start-1). */
138 /* Never >= bignum_limit. */
140 int target_big_endian;
142 static char *old_buffer; /* JF a hack */
143 static char *old_input;
144 static char *old_limit;
146 /* Variables for handling include file directory list. */
148 char **include_dirs; /* List of pointers to directories to
149 search for .include's */
150 int include_dir_count; /* How many are in the list */
151 int include_dir_maxlen = 1;/* Length of longest in list */
153 #ifndef WORKING_DOT_WORD
154 struct broken_word *broken_words;
155 int new_broken_words;
158 static char *demand_copy_string PARAMS ((int *lenP));
159 int is_it_end_of_statement PARAMS ((void));
160 unsigned int next_char_of_string PARAMS ((void));
161 static segT get_segmented_expression PARAMS ((expressionS *expP));
162 static segT get_known_segmented_expression PARAMS ((expressionS * expP));
163 static void grow_bignum PARAMS ((void));
164 static void pobegin PARAMS ((void));
175 obj_read_begin_hook ();
177 /* Something close -- but not too close -- to a multiple of 1024.
178 The debugging malloc I'm using has 24 bytes of overhead. */
179 obstack_begin (¬es, 5090);
180 obstack_begin (&cond_obstack, 990);
182 #define BIGNUM_BEGIN_SIZE (16)
183 bignum_low = xmalloc ((long) BIGNUM_BEGIN_SIZE);
184 bignum_limit = bignum_low + BIGNUM_BEGIN_SIZE;
186 /* Use machine dependent syntax */
187 for (p = line_separator_chars; *p; p++)
188 is_end_of_line[*p] = 1;
189 /* Use more. FIXME-SOMEDAY. */
192 /* set up pseudo-op tables */
194 struct hash_control *po_hash;
196 static const pseudo_typeS potable[] =
198 {"abort", s_abort, 0},
199 {"align", s_align_ptwo, 0},
200 {"ascii", stringer, 0},
201 {"asciz", stringer, 1},
207 {"double", float_cons, 'd'},
209 {"eject", listing_eject, 0}, /* Formfeed listing */
212 {"endif", s_endif, 0},
217 {"extern", s_ignore, 0}, /* We treat all undef as ext */
218 {"appfile", s_app_file, 1},
219 {"appline", s_app_line, 0},
220 {"file", s_app_file, 0},
222 {"float", float_cons, 'f'},
223 {"global", s_globl, 0},
224 {"globl", s_globl, 0},
227 {"ifdef", s_ifdef, 0},
228 {"ifeqs", s_ifeqs, 0},
229 {"ifndef", s_ifdef, 1},
230 {"ifnes", s_ifeqs, 1},
231 {"ifnotdef", s_ifdef, 1},
232 {"include", s_include, 0},
234 {"lcomm", s_lcomm, 0},
235 {"lflags", listing_flags, 0}, /* Listing flags */
236 {"list", listing_list, 1}, /* Turn listing on */
239 {"nolist", listing_list, 0}, /* Turn listing off */
240 {"octa", big_cons, 16},
242 {"psize", listing_psize, 0}, /* set paper size */
244 {"quad", big_cons, 8},
245 {"sbttl", listing_title, 1}, /* Subtitle of listing */
250 {"single", float_cons, 'f'},
252 {"space", s_space, 0},
255 {"title", listing_title, 0}, /* Listing title */
260 {NULL} /* end sentinel */
266 char *errtxt; /* error text */
267 const pseudo_typeS *pop;
269 po_hash = hash_new ();
271 /* Do the target-specific pseudo ops. */
272 for (pop = md_pseudo_table; pop->poc_name; pop++)
274 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
275 if (errtxt && *errtxt)
277 as_fatal ("error constructing md pseudo-op table");
281 /* Now object specific. Skip any that were in the target table. */
282 for (pop = obj_pseudo_table; pop->poc_name; pop++)
284 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
285 if (errtxt && *errtxt)
287 if (!strcmp (errtxt, "exists"))
289 #ifdef DIE_ON_OVERRIDES
290 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
291 #endif /* DIE_ON_OVERRIDES */
292 continue; /* OK if target table overrides. */
296 as_fatal ("error constructing obj pseudo-op table");
297 } /* if overridden */
301 /* Now portable ones. Skip any that we've seen already. */
302 for (pop = potable; pop->poc_name; pop++)
304 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
305 if (errtxt && *errtxt)
307 if (!strcmp (errtxt, "exists"))
309 #ifdef DIE_ON_OVERRIDES
310 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
311 #endif /* DIE_ON_OVERRIDES */
312 continue; /* OK if target table overrides. */
316 as_fatal ("error constructing obj pseudo-op table");
317 } /* if overridden */
324 #define HANDLE_CONDITIONAL_ASSEMBLY() \
325 if (ignore_input ()) \
327 while (! is_end_of_line[*input_line_pointer++]) \
328 if (input_line_pointer == buffer_limit) \
334 /* read_a_source_file()
336 * We read the file, putting things into a web that
337 * represents what we have been reading.
340 read_a_source_file (name)
344 register char *s; /* string of symbol, '\0' appended */
348 buffer = input_scrub_new_file (name);
351 listing_newline ("");
353 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
354 { /* We have another line to parse. */
355 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
356 contin: /* JF this goto is my fault I admit it.
357 Someone brave please re-write the whole
358 input section here? Pleeze??? */
359 while (input_line_pointer < buffer_limit)
361 /* We have more of this buffer to parse. */
364 * We now have input_line_pointer->1st char of next line.
365 * If input_line_pointer [-1] == '\n' then we just
366 * scanned another line: so bump line counters.
368 if (input_line_pointer[-1] == '\n')
370 bump_line_counters ();
373 /* Text at the start of a line must be a label, we run down and stick a colon in */
374 if (is_name_beginner (*input_line_pointer))
376 char *line_start = input_line_pointer;
377 char c = get_symbol_end ();
379 *input_line_pointer = c;
381 input_line_pointer++;
389 * We are at the begining of a line, or similar place.
390 * We expect a well-formed assembler statement.
391 * A "symbol-name:" is a statement.
393 * Depending on what compiler is used, the order of these tests
394 * may vary to catch most common case 1st.
395 * Each test is independent of all other tests at the (top) level.
396 * PLEASE make a compiler that doesn't use this assembler.
397 * It is crufty to waste a compiler's time encoding things for this
398 * assembler, which then wastes more time decoding it.
399 * (And communicating via (linear) files is silly!
400 * If you must pass stuff, please pass a tree!)
402 if ((c = *input_line_pointer++) == '\t'
407 c = *input_line_pointer++;
409 know (c != ' '); /* No further leading whitespace. */
412 * C is the 1st significant character.
413 * Input_line_pointer points after that character.
415 if (is_name_beginner (c))
416 { /* want user-defined label or pseudo/opcode */
417 HANDLE_CONDITIONAL_ASSEMBLY ();
419 s = --input_line_pointer;
420 c = get_symbol_end (); /* name's delimiter */
422 * C is character after symbol.
423 * That character's place in the input line is now '\0'.
424 * S points to the beginning of the symbol.
425 * [In case of pseudo-op, s->'.'.]
426 * Input_line_pointer->'\0' where c was.
428 if (TC_START_LABEL(c, input_line_pointer))
430 colon (s); /* user-defined label */
431 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
432 /* Input_line_pointer->after ':'. */
437 else if (c == '=' || input_line_pointer[1] == '=')
440 demand_empty_rest_of_line ();
443 { /* expect pseudo-op or machine instruction */
445 if (!done_pseudo (s))
452 /* The m88k uses pseudo-ops without a period. */
453 pop = (pseudo_typeS *) hash_find (po_hash, s);
454 if (pop != NULL && pop->poc_handler == NULL)
458 if (pop != NULL || *s == '.')
463 * WARNING: c has next char, which may be end-of-line.
464 * We lookup the pseudo-op table with s+1 because we
465 * already know that the pseudo-op begins with a '.'.
469 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
471 /* Print the error msg now, while we still can */
474 as_bad ("Unknown pseudo-op: `%s'", s);
475 *input_line_pointer = c;
480 /* Put it back for error messages etc. */
481 *input_line_pointer = c;
482 /* The following skip of whitespace is compulsory.
483 A well shaped space is sometimes all that separates
484 keyword from operands. */
485 if (c == ' ' || c == '\t')
487 input_line_pointer++;
488 } /* Skip seperator after keyword. */
490 * Input_line is restored.
491 * Input_line_pointer->1st non-blank char
492 * after pseudo-operation.
496 ignore_rest_of_line ();
501 (*pop->poc_handler) (pop->poc_val);
502 } /* if we have one */
506 { /* machine instruction */
507 /* WARNING: c has char, which may be end-of-line. */
508 /* Also: input_line_pointer->`\0` where c was. */
509 *input_line_pointer = c;
510 while (!is_end_of_line[*input_line_pointer])
512 input_line_pointer++;
515 c = *input_line_pointer;
516 *input_line_pointer = '\0';
518 md_assemble (s); /* Assemble 1 instruction. */
520 *input_line_pointer++ = c;
522 /* We resume loop AFTER the end-of-line from this instruction */
527 } /* if (is_name_beginner(c) */
530 if (is_end_of_line[c])
533 } /* empty statement */
536 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
538 { /* local label ("4:") */
539 char *backup = input_line_pointer;
541 HANDLE_CONDITIONAL_ASSEMBLY ();
545 while (isdigit (*input_line_pointer))
547 temp = (temp * 10) + *input_line_pointer - '0';
548 ++input_line_pointer;
549 } /* read the whole number */
551 #ifdef LOCAL_LABELS_DOLLAR
552 if (*input_line_pointer == '$'
553 && *(input_line_pointer + 1) == ':')
555 input_line_pointer += 2;
557 if (dollar_label_defined (temp))
559 as_fatal ("label \"%d$\" redefined", temp);
562 define_dollar_label (temp);
563 colon (dollar_label_name (temp, 0));
566 #endif /* LOCAL_LABELS_DOLLAR */
568 #ifdef LOCAL_LABELS_FB
569 if (*input_line_pointer++ == ':')
571 fb_label_instance_inc (temp);
572 colon (fb_label_name (temp, 0));
575 #endif /* LOCAL_LABELS_FB */
577 input_line_pointer = backup;
578 } /* local label ("4:") */
579 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
581 if (c && strchr (line_comment_chars, c))
582 { /* Its a comment. Better say APP or NO_APP */
588 extern char *scrub_string, *scrub_last_string;
590 bump_line_counters ();
591 s = input_line_pointer;
592 if (strncmp (s, "APP\n", 4))
593 continue; /* We ignore it */
596 ends = strstr (s, "#NO_APP\n");
603 /* The end of the #APP wasn't in this buffer. We
604 keep reading in buffers until we find the #NO_APP
605 that goes with this #APP There is one. The specs
607 tmp_len = buffer_limit - s;
608 tmp_buf = xmalloc (tmp_len + 1);
609 memcpy (tmp_buf, s, tmp_len);
612 new_tmp = input_scrub_next_buffer (&buffer);
616 buffer_limit = new_tmp;
617 input_line_pointer = buffer;
618 ends = strstr (buffer, "#NO_APP\n");
622 num = buffer_limit - buffer;
624 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
625 memcpy (tmp_buf, buffer + tmp_len, num);
630 input_line_pointer = ends ? ends + 8 : NULL;
638 input_line_pointer = ends + 8;
640 new_buf = xmalloc (100);
645 scrub_last_string = ends;
650 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
654 if (new_tmp == new_buf + new_length)
656 new_buf = xrealloc (new_buf, new_length + 100);
657 new_tmp = new_buf + new_length;
665 old_input = input_line_pointer;
666 old_limit = buffer_limit;
668 input_line_pointer = new_buf;
669 buffer_limit = new_tmp;
673 HANDLE_CONDITIONAL_ASSEMBLY ();
675 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
676 input_line_pointer--; /* Report unknown char as ignored. */
677 ignore_rest_of_line ();
678 } /* while (input_line_pointer<buffer_limit) */
681 bump_line_counters ();
685 input_line_pointer = old_input;
686 buffer_limit = old_limit;
691 } /* while (more buffers to scan) */
692 input_scrub_close (); /* Close the input file */
694 } /* read_a_source_file() */
699 as_fatal (".abort detected. Abandoning ship.");
702 /* For machines where ".align 4" means align to a 4 byte boundary. */
707 register unsigned int temp;
708 register long temp_fill;
710 unsigned long max_alignment = 1 << 15;
712 if (is_end_of_line[*input_line_pointer])
713 temp = arg; /* Default value from pseudo-op table */
715 temp = get_absolute_expression ();
717 if (temp > max_alignment)
719 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
723 * For the sparc, `.align (1<<n)' actually means `.align n'
724 * so we have to convert it.
728 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
732 as_bad ("Alignment not a power of 2");
735 if (*input_line_pointer == ',')
737 input_line_pointer++;
738 temp_fill = get_absolute_expression ();
740 else if (now_seg != data_section && now_seg != bss_section)
741 temp_fill = NOP_OPCODE;
744 /* Only make a frag if we HAVE to. . . */
745 if (temp && !need_pass_2)
746 frag_align (temp, (int) temp_fill);
748 record_alignment (now_seg, temp);
750 demand_empty_rest_of_line ();
751 } /* s_align_bytes() */
753 /* For machines where ".align 4" means align to 2**4 boundary. */
758 register long temp_fill;
759 long max_alignment = 15;
761 temp = get_absolute_expression ();
762 if (temp > max_alignment)
763 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
766 as_bad ("Alignment negative. 0 assumed.");
769 if (*input_line_pointer == ',')
771 input_line_pointer++;
772 temp_fill = get_absolute_expression ();
774 /* @@ Fix this right for BFD! */
775 else if (now_seg != data_section && now_seg != bss_section)
776 temp_fill = NOP_OPCODE;
779 /* Only make a frag if we HAVE to. . . */
780 if (temp && !need_pass_2)
781 frag_align (temp, (int) temp_fill);
783 record_alignment (now_seg, temp);
785 demand_empty_rest_of_line ();
786 } /* s_align_ptwo() */
795 register symbolS *symbolP;
797 name = input_line_pointer;
798 c = get_symbol_end ();
799 /* just after name is now '\0' */
800 p = input_line_pointer;
803 if (*input_line_pointer != ',')
805 as_bad ("Expected comma after symbol-name: rest of line ignored.");
806 ignore_rest_of_line ();
809 input_line_pointer++; /* skip ',' */
810 if ((temp = get_absolute_expression ()) < 0)
812 as_warn (".COMMon length (%d.) <0! Ignored.", temp);
813 ignore_rest_of_line ();
817 symbolP = symbol_find_or_make (name);
819 if (S_IS_DEFINED (symbolP))
821 as_bad ("Ignoring attempt to re-define symbol");
822 ignore_rest_of_line ();
825 if (S_GET_VALUE (symbolP))
827 if (S_GET_VALUE (symbolP) != temp)
828 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
829 S_GET_NAME (symbolP),
830 S_GET_VALUE (symbolP),
835 S_SET_VALUE (symbolP, temp);
836 S_SET_EXTERNAL (symbolP);
839 if ( (!temp) || !flagseen['1'])
840 S_GET_OTHER(symbolP) = const_flag;
841 #endif /* not OBJ_VMS */
842 know (symbolP->sy_frag == &zero_address_frag);
843 demand_empty_rest_of_line ();
852 temp = get_absolute_expression ();
855 section = text_section;
859 section = data_section;
862 subseg_set (section, (subsegT) temp);
864 subseg_new (section, (subsegT) temp);
870 demand_empty_rest_of_line ();
873 /* Handle the .appfile pseudo-op. This is automatically generated by
874 do_scrub_next_char when a preprocessor # line comment is seen with
875 a file name. This default definition may be overridden by the
876 object or CPU specific pseudo-ops. This function is also the
877 default definition for .file; the APPFILE argument is 1 for
878 .appfile, 0 for .file. */
887 /* Some assemblers tolerate immediately following '"' */
888 if ((s = demand_copy_string (&length)) != 0)
890 /* If this is a fake .appfile, a fake newline was inserted into
891 the buffer. Passing -2 to new_logical_line tells it to
893 new_logical_line (s, appfile ? -2 : -1);
894 demand_empty_rest_of_line ();
897 listing_source_file (s);
901 c_dot_file_symbol (s);
902 #endif /* OBJ_COFF */
908 /* Handle the .appline pseudo-op. This is automatically generated by
909 do_scrub_next_char when a preprocessor # line comment is seen.
910 This default definition may be overridden by the object or CPU
911 specific pseudo-ops. */
918 /* The given number is that of the next line. */
919 l = get_absolute_expression () - 1;
920 new_logical_line ((char *) NULL, l);
923 listing_source_line (l);
925 demand_empty_rest_of_line ();
931 long temp_repeat = 0;
933 register long temp_fill = 0;
937 temp_repeat = get_absolute_expression ();
938 if (*input_line_pointer == ',')
940 input_line_pointer++;
941 temp_size = get_absolute_expression ();
942 if (*input_line_pointer == ',')
944 input_line_pointer++;
945 temp_fill = get_absolute_expression ();
948 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
949 #define BSD_FILL_SIZE_CROCK_8 (8)
950 if (temp_size > BSD_FILL_SIZE_CROCK_8)
952 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
953 temp_size = BSD_FILL_SIZE_CROCK_8;
957 as_warn ("Size negative: .fill ignored.");
960 else if (temp_repeat <= 0)
962 as_warn ("Repeat < 0, .fill ignored");
966 if (temp_size && !need_pass_2)
968 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
969 memset (p, 0, (int) temp_size);
970 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
971 * flavoured AS. The following bizzare behaviour is to be
972 * compatible with above. I guess they tried to take up to 8
973 * bytes from a 4-byte expression and they forgot to sign
974 * extend. Un*x Sux. */
975 #define BSD_FILL_SIZE_CROCK_4 (4)
976 md_number_to_chars (p, temp_fill,
977 (temp_size > BSD_FILL_SIZE_CROCK_4
978 ? BSD_FILL_SIZE_CROCK_4
980 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
981 * but emits no error message because it seems a legal thing to do.
982 * It is a degenerate case of .fill but could be emitted by a compiler.
985 demand_empty_rest_of_line ();
997 name = input_line_pointer;
998 c = get_symbol_end ();
999 symbolP = symbol_find_or_make (name);
1000 *input_line_pointer = c;
1002 S_SET_EXTERNAL (symbolP);
1005 input_line_pointer++;
1007 if (*input_line_pointer == '\n')
1012 demand_empty_rest_of_line ();
1016 s_lcomm (needs_align)
1017 /* 1 if this was a ".bss" directive, which may require a 3rd argument
1018 (alignment); 0 if it was an ".lcomm" (2 args only) */
1021 register char *name;
1025 register symbolS *symbolP;
1026 segT current_seg = now_seg;
1027 subsegT current_subseg = now_subseg;
1028 const int max_alignment = 15;
1030 segT bss_seg = bss_section;
1032 name = input_line_pointer;
1033 c = get_symbol_end ();
1034 p = input_line_pointer;
1037 if (*input_line_pointer != ',')
1039 as_bad ("Expected comma after name");
1040 ignore_rest_of_line ();
1044 ++input_line_pointer;
1046 if (*input_line_pointer == '\n')
1048 as_bad ("Missing size expression");
1052 if ((temp = get_absolute_expression ()) < 0)
1054 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1055 ignore_rest_of_line ();
1061 /* For MIPS ECOFF, small objects are put in .sbss. */
1062 if (temp <= bfd_get_gp_size (stdoutput))
1063 bss_seg = subseg_new (".sbss", 1);
1071 if (*input_line_pointer != ',')
1073 as_bad ("Expected comma after size");
1074 ignore_rest_of_line ();
1077 input_line_pointer++;
1079 if (*input_line_pointer == '\n')
1081 as_bad ("Missing alignment");
1084 align = get_absolute_expression ();
1085 if (align > max_alignment)
1087 align = max_alignment;
1088 as_warn ("Alignment too large: %d. assumed.", align);
1093 as_warn ("Alignment negative. 0 assumed.");
1095 record_alignment (bss_seg, align);
1096 } /* if needs align */
1099 symbolP = symbol_find_or_make (name);
1103 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1104 S_GET_OTHER (symbolP) == 0 &&
1105 S_GET_DESC (symbolP) == 0 &&
1106 #endif /* OBJ_AOUT or OBJ_BOUT */
1107 (S_GET_SEGMENT (symbolP) == bss_seg
1108 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1112 #ifdef BFD_ASSEMBLER
1113 subseg_set (bss_seg, 1);
1115 subseg_new (bss_seg, 1);
1119 frag_align (align, 0);
1120 /* detach from old frag */
1121 if (S_GET_SEGMENT (symbolP) == bss_seg)
1122 symbolP->sy_frag->fr_symbol = NULL;
1124 symbolP->sy_frag = frag_now;
1125 p = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1129 S_SET_SEGMENT (symbolP, bss_seg);
1132 /* The symbol may already have been created with a preceding
1133 ".globl" directive -- be careful not to step on storage class
1134 in that case. Otherwise, set it to static. */
1135 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1137 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1139 #endif /* OBJ_COFF */
1143 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1146 #ifdef BFD_ASSEMBLER
1147 subseg_set (current_seg, current_subseg);
1149 subseg_new (current_seg, current_subseg);
1152 demand_empty_rest_of_line ();
1170 register char *name;
1174 register symbolS *symbolP;
1176 /* we permit ANY defined expression: BSD4.2 demands constants */
1177 name = input_line_pointer;
1178 c = get_symbol_end ();
1179 p = input_line_pointer;
1182 if (*input_line_pointer != ',')
1185 as_bad ("Expected comma after name \"%s\"", name);
1187 ignore_rest_of_line ();
1190 input_line_pointer++;
1192 if (exp.X_op != O_constant
1193 && exp.X_op != O_register)
1195 as_bad ("bad expression");
1196 ignore_rest_of_line ();
1200 symbolP = symbol_find_or_make (name);
1202 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1203 symbolP->sy_desc == 0) out of this test because coff doesn't have
1204 those fields, and I can't see when they'd ever be tripped. I
1205 don't think I understand why they were here so I may have
1206 introduced a bug. As recently as 1.37 didn't have this test
1207 anyway. xoxorich. */
1209 if (S_GET_SEGMENT (symbolP) == undefined_section
1210 && S_GET_VALUE (symbolP) == 0)
1212 /* The name might be an undefined .global symbol; be sure to
1213 keep the "external" bit. */
1214 S_SET_SEGMENT (symbolP,
1215 (exp.X_op == O_constant
1218 S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
1222 as_bad ("Symbol %s already defined", name);
1225 demand_empty_rest_of_line ();
1231 register segT segment;
1233 register long temp_fill;
1235 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1236 thing as a sub-segment-relative origin. Any absolute origin is
1237 given a warning, then assumed to be segment-relative. Any
1238 segmented origin expression ("foo+42") had better be in the right
1239 segment or the .org is ignored.
1241 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1242 we never know sub-segment sizes when we are reading code. BSD
1243 will crash trying to emit negative numbers of filler bytes in
1244 certain .orgs. We don't crash, but see as-write for that code.
1246 Don't make frag if need_pass_2==1. */
1247 segment = get_known_segmented_expression (&exp);
1248 if (*input_line_pointer == ',')
1250 input_line_pointer++;
1251 temp_fill = get_absolute_expression ();
1257 if (segment != now_seg && segment != absolute_section)
1258 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1259 segment_name (segment), segment_name (now_seg));
1260 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1261 exp.X_add_number, (char *) 0);
1263 } /* if (ok to make frag) */
1264 demand_empty_rest_of_line ();
1270 register char *name;
1271 register char delim;
1272 register char *end_name;
1273 register symbolS *symbolP;
1276 * Especial apologies for the random logic:
1277 * this just grew, and could be parsed much more simply!
1280 name = input_line_pointer;
1281 delim = get_symbol_end ();
1282 end_name = input_line_pointer;
1286 if (*input_line_pointer != ',')
1289 as_bad ("Expected comma after name \"%s\"", name);
1291 ignore_rest_of_line ();
1295 input_line_pointer++;
1298 if (name[0] == '.' && name[1] == '\0')
1300 /* Turn '. = mumble' into a .org mumble */
1301 register segT segment;
1305 segment = get_known_segmented_expression (&exp);
1309 if (segment != now_seg && segment != absolute_section)
1310 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1311 segment_name (segment),
1312 segment_name (now_seg));
1313 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1314 exp.X_add_number, (char *) 0);
1316 } /* if (ok to make frag) */
1322 if ((symbolP = symbol_find (name)) == NULL
1323 && (symbolP = md_undefined_symbol (name)) == NULL)
1325 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1327 /* "set" symbols are local unless otherwise specified. */
1328 SF_SET_LOCAL (symbolP);
1329 #endif /* OBJ_COFF */
1331 } /* make a new symbol */
1333 symbol_table_insert (symbolP);
1336 pseudo_set (symbolP);
1337 demand_empty_rest_of_line ();
1345 register long temp_fill;
1348 /* Just like .fill, but temp_size = 1 */
1349 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1351 temp_fill = get_absolute_expression ();
1355 input_line_pointer--; /* Backup over what was not a ','. */
1360 temp_repeat *= mult;
1362 if (temp_repeat <= 0)
1364 as_warn ("Repeat < 0, .space ignored");
1365 ignore_rest_of_line ();
1370 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1371 temp_repeat, (char *) 0);
1374 demand_empty_rest_of_line ();
1382 temp = get_absolute_expression ();
1383 #ifdef BFD_ASSEMBLER
1384 subseg_set (text_section, (subsegT) temp);
1386 subseg_new (text_section, (subsegT) temp);
1388 demand_empty_rest_of_line ();
1393 demand_empty_rest_of_line ()
1396 if (is_end_of_line[*input_line_pointer])
1398 input_line_pointer++;
1402 ignore_rest_of_line ();
1404 /* Return having already swallowed end-of-line. */
1405 } /* Return pointing just after end-of-line. */
1408 ignore_rest_of_line () /* For suspect lines: gives warning. */
1410 if (!is_end_of_line[*input_line_pointer])
1412 if (isprint (*input_line_pointer))
1413 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1414 *input_line_pointer);
1416 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1417 *input_line_pointer);
1418 while (input_line_pointer < buffer_limit
1419 && !is_end_of_line[*input_line_pointer])
1421 input_line_pointer++;
1424 input_line_pointer++; /* Return pointing just after end-of-line. */
1425 know (is_end_of_line[input_line_pointer[-1]]);
1431 * In: Pointer to a symbol.
1432 * Input_line_pointer->expression.
1434 * Out: Input_line_pointer->just after any whitespace after expression.
1435 * Tried to set symbol to value of expression.
1436 * Will change symbols type, value, and frag;
1439 pseudo_set (symbolP)
1443 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1445 #endif /* OBJ_AOUT or OBJ_BOUT */
1447 know (symbolP); /* NULL pointer is logic error. */
1448 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1449 /* @@ Fix this right for BFD. */
1450 ext = S_IS_EXTERNAL (symbolP);
1451 #endif /* OBJ_AOUT or OBJ_BOUT */
1453 (void) expression (&exp);
1455 if (exp.X_op == O_illegal)
1456 as_bad ("illegal expression; zero assumed");
1457 else if (exp.X_op == O_absent)
1458 as_bad ("missing expression; zero assumed");
1459 else if (exp.X_op == O_big)
1460 as_bad ("%s number invalid; zero assumed",
1461 exp.X_add_number > 0 ? "bignum" : "floating point");
1462 else if (exp.X_op == O_subtract
1463 && (S_GET_SEGMENT (exp.X_add_symbol)
1464 == S_GET_SEGMENT (exp.X_op_symbol))
1465 && SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
1466 && exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
1468 exp.X_op = O_constant;
1469 exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
1470 - S_GET_VALUE (exp.X_op_symbol));
1478 exp.X_add_number = 0;
1481 S_SET_SEGMENT (symbolP, absolute_section);
1482 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1483 /* @@ Fix this right for BFD. */
1485 S_SET_EXTERNAL (symbolP);
1487 S_CLEAR_EXTERNAL (symbolP);
1488 #endif /* OBJ_AOUT or OBJ_BOUT */
1489 S_SET_VALUE (symbolP, exp.X_add_number);
1490 symbolP->sy_frag = &zero_address_frag;
1494 S_SET_SEGMENT (symbolP, reg_section);
1495 S_SET_VALUE (symbolP, exp.X_add_number);
1496 symbolP->sy_frag = &zero_address_frag;
1500 if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section)
1501 symbolP->sy_value = exp;
1504 S_SET_SEGMENT (symbolP, S_GET_SEGMENT (exp.X_add_symbol));
1505 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1506 /* @@ Fix this right for BFD! */
1508 S_SET_EXTERNAL (symbolP);
1510 S_CLEAR_EXTERNAL (symbolP);
1511 #endif /* OBJ_AOUT or OBJ_BOUT */
1512 S_SET_VALUE (symbolP,
1513 exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1514 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1519 /* The value is some complex expression.
1520 FIXME: Should we set the segment to anything? */
1521 symbolP->sy_value = exp;
1529 * CONStruct more frag of .bytes, or .words etc.
1530 * Should need_pass_2 be 1 then emit no frag(s).
1531 * This understands EXPRESSIONS, as opposed to big_cons().
1535 * This has a split personality. We use expression() to read the
1536 * value. We can detect if the value won't fit in a byte or word.
1537 * But we can't detect if expression() discarded significant digits
1538 * in the case of a long. Not worth the crocks required to fix it.
1541 /* Select a parser for cons expressions. */
1543 /* Some targets need to parse the expression in various fancy ways.
1544 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1545 (for example, the HPPA does this). Otherwise, you can define
1546 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1547 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1548 are defined, which is the normal case, then only simple expressions
1551 #ifndef TC_PARSE_CONS_EXPRESSION
1552 #ifdef BITFIELD_CONS_EXPRESSIONS
1553 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1555 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1558 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1560 parse_mri_cons PARAMS ((expressionS *exp));
1562 #ifdef REPEAT_CONS_EXPRESSIONS
1563 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1565 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1568 /* If we haven't gotten one yet, just call expression. */
1569 #ifndef TC_PARSE_CONS_EXPRESSION
1570 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1574 /* worker to do .byte etc statements */
1575 /* clobbers input_line_pointer, checks */
1579 register unsigned int nbytes; /* 1=.byte, 2=.word, 4=.long */
1583 if (is_it_end_of_statement ())
1585 demand_empty_rest_of_line ();
1591 TC_PARSE_CONS_EXPRESSION (&exp, nbytes);
1592 emit_expr (&exp, nbytes);
1594 while (*input_line_pointer++ == ',');
1596 input_line_pointer--; /* Put terminator back into stream. */
1597 demand_empty_rest_of_line ();
1600 /* Put the contents of expression EXP into the object file using
1601 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1604 emit_expr (exp, nbytes)
1606 unsigned int nbytes;
1611 /* Don't do anything if we are going to make another pass. */
1617 if (op == O_absent || op == O_illegal)
1619 as_warn ("zero assumed for missing expression");
1620 exp->X_add_number = 0;
1623 else if (op == O_big)
1625 as_bad ("%s number invalid; zero assumed",
1626 exp->X_add_number > 0 ? "bignum" : "floating point");
1627 exp->X_add_number = 0;
1630 else if (op == O_register)
1632 as_warn ("register value used as expression");
1636 p = frag_more (nbytes);
1638 #ifndef WORKING_DOT_WORD
1639 /* If we have the difference of two symbols in a word, save it on
1640 the broken_words list. See the code in write.c. */
1641 if (op == O_subtract && nbytes == 2)
1643 struct broken_word *x;
1645 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1646 x->next_broken_word = broken_words;
1649 x->word_goes_here = p;
1651 x->add = exp->X_add_symbol;
1652 x->sub = exp->X_op_symbol;
1653 x->addnum = exp->X_add_number;
1660 if (op == O_constant)
1665 register long unmask;
1667 /* JF << of >= number of bits in the object is undefined. In
1668 particular SPARC (Sun 4) has problems */
1669 if (nbytes >= sizeof (long))
1672 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1674 unmask = ~mask; /* Do store these bits. */
1677 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1678 mask = ~(unmask >> 1); /* Includes sign bit now. */
1681 get = exp->X_add_number;
1683 if ((get & mask) != 0 && (get & mask) != mask)
1684 { /* Leading bits contain both 0s & 1s. */
1685 as_warn ("Value 0x%x truncated to 0x%x.", get, use);
1687 md_number_to_chars (p, use, nbytes); /* put bytes in right order. */
1691 md_number_to_chars (p, (long) 0, nbytes);
1693 /* Now we need to generate a fixS to record the symbol value.
1694 This is easy for BFD. For other targets it can be more
1695 complex. For very complex cases (currently, the HPPA and
1696 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1697 want. For simpler cases, you can define TC_CONS_RELOC to be
1698 the name of the reloc code that should be stored in the fixS.
1699 If neither is defined, the code uses NO_RELOC if it is
1700 defined, and otherwise uses 0. */
1702 #ifdef BFD_ASSEMBLER
1703 fix_new_exp (frag_now, p - frag_now->fr_literal, nbytes, exp, 0,
1704 /* @@ Should look at CPU word size. */
1705 nbytes == 8 ? BFD_RELOC_64 : BFD_RELOC_32);
1707 #ifdef TC_CONS_FIX_NEW
1708 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1710 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1711 it is defined, otherwise use NO_RELOC if it is defined,
1713 #ifndef TC_CONS_RELOC
1715 #define TC_CONS_RELOC NO_RELOC
1717 #define TC_CONS_RELOC 0
1720 fix_new_exp (frag_now, p - frag_now->fr_literal, nbytes, exp, 0,
1722 #endif /* TC_CONS_FIX_NEW */
1723 #endif /* BFD_ASSEMBLER */
1727 #ifdef BITFIELD_CONS_EXPRESSIONS
1729 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1730 w:x,y:z, where w and y are bitwidths and x and y are values. They
1731 then pack them all together. We do a little better in that we allow
1732 them in words, longs, etc. and we'll pack them in target byte order
1735 The rules are: pack least significat bit first, if a field doesn't
1736 entirely fit, put it in the next unit. Overflowing the bitfield is
1737 explicitly *not* even a warning. The bitwidth should be considered
1740 To use this function the tc-XXX.h file should define
1741 BITFIELD_CONS_EXPRESSIONS. */
1744 parse_bitfield_cons (exp, nbytes)
1746 unsigned int nbytes;
1748 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1749 char *hold = input_line_pointer;
1751 (void) expression (exp);
1753 if (*input_line_pointer == ':')
1759 unsigned long width;
1761 if (*input_line_pointer != ':')
1763 input_line_pointer = hold;
1765 } /* next piece is not a bitfield */
1767 /* In the general case, we can't allow
1768 full expressions with symbol
1769 differences and such. The relocation
1770 entries for symbols not defined in this
1771 assembly would require arbitrary field
1772 widths, positions, and masks which most
1773 of our current object formats don't
1776 In the specific case where a symbol
1777 *is* defined in this assembly, we
1778 *could* build fixups and track it, but
1779 this could lead to confusion for the
1780 backends. I'm lazy. I'll take any
1781 SEG_ABSOLUTE. I think that means that
1782 you can use a previous .set or
1783 .equ type symbol. xoxorich. */
1785 if (exp->X_op == O_absent)
1787 as_warn ("using a bit field width of zero");
1788 exp->X_add_number = 0;
1789 exp->X_op = O_constant;
1790 } /* implied zero width bitfield */
1792 if (exp->X_op != O_constant)
1794 *input_line_pointer = '\0';
1795 as_bad ("field width \"%s\" too complex for a bitfield", hold);
1796 *input_line_pointer = ':';
1797 demand_empty_rest_of_line ();
1801 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1803 as_warn ("field width %d too big to fit in %d bytes: truncated to %d bits",
1804 width, nbytes, (BITS_PER_CHAR * nbytes));
1805 width = BITS_PER_CHAR * nbytes;
1808 if (width > bits_available)
1810 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1811 input_line_pointer = hold;
1812 exp->X_add_number = value;
1816 hold = ++input_line_pointer; /* skip ':' */
1818 (void) expression (exp);
1819 if (exp->X_op != O_constant)
1821 char cache = *input_line_pointer;
1823 *input_line_pointer = '\0';
1824 as_bad ("field value \"%s\" too complex for a bitfield", hold);
1825 *input_line_pointer = cache;
1826 demand_empty_rest_of_line ();
1830 value |= ((~(-1 << width) & exp->X_add_number)
1831 << ((BITS_PER_CHAR * nbytes) - bits_available));
1833 if ((bits_available -= width) == 0
1834 || is_it_end_of_statement ()
1835 || *input_line_pointer != ',')
1838 } /* all the bitfields we're gonna get */
1840 hold = ++input_line_pointer;
1841 (void) expression (exp);
1842 } /* forever loop */
1844 exp->X_add_number = value;
1845 exp->X_op = O_constant;
1846 } /* if looks like a bitfield */
1847 } /* parse_bitfield_cons() */
1849 #endif /* BITFIELD_CONS_EXPRESSIONS */
1854 parse_mri_cons (exp, nbytes)
1856 unsigned int nbytes;
1858 if (*input_line_pointer == '\'')
1860 /* An MRI style string, cut into as many bytes as will fit into
1861 a nbyte chunk, left justify if necessary, and separate with
1862 commas so we can try again later */
1864 unsigned int result = 0;
1865 input_line_pointer++;
1866 for (scan = 0; scan < nbytes; scan++)
1868 if (*input_line_pointer == '\'')
1870 if (input_line_pointer[1] == '\'')
1872 input_line_pointer++;
1877 result = (result << 8) | (*input_line_pointer++);
1881 while (scan < nbytes)
1886 /* Create correct expression */
1887 exp->X_op = O_constant;
1888 exp->X_add_number = result;
1889 /* Fake it so that we can read the next char too */
1890 if (input_line_pointer[0] != '\'' ||
1891 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
1893 input_line_pointer -= 2;
1894 input_line_pointer[0] = ',';
1895 input_line_pointer[1] = '\'';
1898 input_line_pointer++;
1906 #ifdef REPEAT_CONS_EXPRESSIONS
1908 /* Parse a repeat expression for cons. This is used by the MIPS
1909 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1910 object file COUNT times.
1912 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1915 parse_repeat_cons (exp, nbytes)
1917 unsigned int nbytes;
1924 if (*input_line_pointer != ':')
1926 /* No repeat count. */
1930 ++input_line_pointer;
1931 expression (&count);
1932 if (count.X_op != O_constant
1933 || count.X_add_number <= 0)
1935 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1939 /* The cons function is going to output this expression once. So we
1940 output it count - 1 times. */
1941 for (i = count.X_add_number - 1; i > 0; i--)
1942 emit_expr (exp, nbytes);
1945 #endif /* REPEAT_CONS_EXPRESSIONS */
1950 * CONStruct more frag(s) of .quads, or .octa etc.
1951 * Makes 0 or more new frags.
1952 * If need_pass_2 == 1, generate no frag.
1953 * This understands only bignums, not expressions. Cons() understands
1956 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
1958 * This creates objects with struct obstack_control objs, destroying
1959 * any context objs held about a partially completed object. Beware!
1962 * I think it sucks to have 2 different types of integers, with 2
1963 * routines to read them, store them etc.
1964 * It would be nicer to permit bignums in expressions and only
1965 * complain if the result overflowed. However, due to "efficiency"...
1967 /* worker to do .quad etc statements */
1968 /* clobbers input_line_pointer, checks */
1970 /* 8=.quad 16=.octa ... */
1974 register int nbytes;
1976 register char c; /* input_line_pointer->c. */
1978 register long length; /* Number of chars in an object. */
1979 register int digit; /* Value of 1 digit. */
1980 register int carry; /* For multi-precision arithmetic. */
1981 register int work; /* For multi-precision arithmetic. */
1982 register char *p; /* For multi-precision arithmetic. */
1984 extern const char hex_value[]; /* In hex_value.c. */
1987 * The following awkward logic is to parse ZERO or more strings,
1988 * comma seperated. Recall an expression includes its leading &
1989 * trailing blanks. We fake a leading ',' if there is (supposed to
1990 * be) a 1st expression, and keep demanding 1 expression for each ','.
1992 if (is_it_end_of_statement ())
1994 c = 0; /* Skip loop. */
1998 c = ','; /* Do loop. */
1999 --input_line_pointer;
2003 ++input_line_pointer;
2005 c = *input_line_pointer;
2006 /* C contains 1st non-blank character of what we hope is a number. */
2009 c = *++input_line_pointer;
2010 if (c == 'x' || c == 'X')
2012 c = *++input_line_pointer;
2025 * This feature (?) is here to stop people worrying about
2026 * mysterious zero constants: which is what they get when
2027 * they completely omit digits.
2029 if (hex_value[c] >= radix)
2031 as_bad ("Missing digits. 0 assumed.");
2033 bignum_high = bignum_low - 1; /* Start constant with 0 chars. */
2034 for (; (digit = hex_value[c]) < radix; c = *++input_line_pointer)
2036 /* Multiply existing number by radix, then add digit. */
2038 for (p = bignum_low; p <= bignum_high; p++)
2040 work = (*p & MASK_CHAR) * radix + carry;
2041 *p = work & MASK_CHAR;
2042 carry = work >> BITS_PER_CHAR;
2047 *bignum_high = carry & MASK_CHAR;
2048 know ((carry & ~MASK_CHAR) == 0);
2051 length = bignum_high - bignum_low + 1;
2052 if (length > nbytes)
2054 as_warn ("Most significant bits truncated in integer constant.");
2058 register long leading_zeroes;
2060 for (leading_zeroes = nbytes - length;
2070 char *src = bignum_low;
2071 p = frag_more (nbytes);
2072 if (target_big_endian)
2075 for (i = nbytes - 1; i >= 0; i--)
2079 memcpy (p, bignum_low, (int) nbytes);
2081 /* C contains character after number. */
2083 c = *input_line_pointer;
2084 /* C contains 1st non-blank character after number. */
2086 demand_empty_rest_of_line ();
2089 /* Extend bignum by 1 char. */
2093 register long length;
2096 if (bignum_high >= bignum_limit)
2098 length = bignum_limit - bignum_low;
2099 bignum_low = xrealloc (bignum_low, length + length);
2100 bignum_high = bignum_low + length;
2101 bignum_limit = bignum_low + length + length;
2103 } /* grow_bignum(); */
2108 * CONStruct some more frag chars of .floats .ffloats etc.
2109 * Makes 0 or more new frags.
2110 * If need_pass_2 == 1, no frags are emitted.
2111 * This understands only floating literals, not expressions. Sorry.
2113 * A floating constant is defined by atof_generic(), except it is preceded
2114 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2115 * reading, I decided to be incompatible. This always tries to give you
2116 * rounded bits to the precision of the pseudo-op. Former AS did premature
2117 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2118 * a choice of 2 flavours of noise according to which of 2 floating-point
2119 * scanners you directed AS to use.
2121 * In: input_line_pointer->whitespace before, or '0' of flonum.
2125 void /* JF was static, but can't be if VAX.C is goning to use it */
2126 float_cons (float_type) /* Worker to do .float etc statements. */
2127 /* Clobbers input_line-pointer, checks end-of-line. */
2128 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2131 int length; /* Number of chars in an object. */
2132 register char *err; /* Error from scanning floating literal. */
2133 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2135 if (is_it_end_of_statement ())
2137 demand_empty_rest_of_line ();
2143 /* input_line_pointer->1st char of a flonum (we hope!). */
2146 /* Skip any 0{letter} that may be present. Don't even check if the
2147 * letter is legal. Someone may invent a "z" format and this routine
2148 * has no use for such information. Lusers beware: you get
2149 * diagnostics if your input is ill-conditioned.
2151 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2152 input_line_pointer += 2;
2154 err = md_atof (float_type, temp, &length);
2155 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2159 as_bad ("Bad floating literal: %s", err);
2160 ignore_rest_of_line ();
2170 #ifdef REPEAT_CONS_EXPRESSIONS
2171 if (*input_line_pointer == ':')
2173 expressionS count_exp;
2175 ++input_line_pointer;
2176 expression (&count_exp);
2177 if (count_exp.X_op != O_constant
2178 || count_exp.X_add_number <= 0)
2180 as_warn ("unresolvable or nonpositive repeat count; using 1");
2183 count = count_exp.X_add_number;
2187 while (--count >= 0)
2189 p = frag_more (length);
2190 memcpy (p, temp, length);
2195 while (*input_line_pointer++ == ',');
2197 --input_line_pointer; /* Put terminator back into stream. */
2198 demand_empty_rest_of_line ();
2199 } /* float_cons() */
2204 * We read 0 or more ',' seperated, double-quoted strings.
2206 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2211 stringer (append_zero) /* Worker to do .ascii etc statements. */
2212 /* Checks end-of-line. */
2213 register int append_zero; /* 0: don't append '\0', else 1 */
2215 register unsigned int c;
2218 * The following awkward logic is to parse ZERO or more strings,
2219 * comma seperated. Recall a string expression includes spaces
2220 * before the opening '\"' and spaces after the closing '\"'.
2221 * We fake a leading ',' if there is (supposed to be)
2222 * a 1st, expression. We keep demanding expressions for each
2225 if (is_it_end_of_statement ())
2227 c = 0; /* Skip loop. */
2228 ++input_line_pointer; /* Compensate for end of loop. */
2232 c = ','; /* Do loop. */
2234 while (c == ',' || c == '<' || c == '"')
2237 switch (*input_line_pointer)
2240 ++input_line_pointer; /*->1st char of string. */
2241 while (is_a_char (c = next_char_of_string ()))
2243 FRAG_APPEND_1_CHAR (c);
2247 FRAG_APPEND_1_CHAR (0);
2249 know (input_line_pointer[-1] == '\"');
2252 input_line_pointer++;
2253 c = get_single_number ();
2254 FRAG_APPEND_1_CHAR (c);
2255 if (*input_line_pointer != '>')
2257 as_bad ("Expected <nn>");
2259 input_line_pointer++;
2262 input_line_pointer++;
2266 c = *input_line_pointer;
2269 demand_empty_rest_of_line ();
2272 /* FIXME-SOMEDAY: I had trouble here on characters with the
2273 high bits set. We'll probably also have trouble with
2274 multibyte chars, wide chars, etc. Also be careful about
2275 returning values bigger than 1 byte. xoxorich. */
2278 next_char_of_string ()
2280 register unsigned int c;
2282 c = *input_line_pointer++ & CHAR_MASK;
2290 switch (c = *input_line_pointer++)
2320 break; /* As itself. */
2335 for (number = 0; isdigit (c); c = *input_line_pointer++)
2337 number = number * 8 + c - '0';
2341 --input_line_pointer;
2345 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2346 as_warn ("Unterminated string: Newline inserted.");
2352 #ifdef ONLY_STANDARD_ESCAPES
2353 as_bad ("Bad escaped character in string, '?' assumed");
2355 #endif /* ONLY_STANDARD_ESCAPES */
2358 } /* switch on escaped char */
2363 } /* switch on char */
2365 } /* next_char_of_string() */
2368 get_segmented_expression (expP)
2369 register expressionS *expP;
2371 register segT retval;
2373 retval = expression (expP);
2374 if (expP->X_op == O_illegal
2375 || expP->X_op == O_absent
2376 || expP->X_op == O_big)
2378 as_bad ("expected address expression; zero assumed");
2379 expP->X_op = O_constant;
2380 expP->X_add_number = 0;
2381 retval = absolute_section;
2387 get_known_segmented_expression (expP)
2388 register expressionS *expP;
2390 register segT retval;
2392 if ((retval = get_segmented_expression (expP)) == undefined_section)
2394 /* There is no easy way to extract the undefined symbol from the
2396 if (expP->X_add_symbol != NULL
2397 && S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
2398 as_warn ("symbol \"%s\" undefined; zero assumed",
2399 S_GET_NAME (expP->X_add_symbol));
2401 as_warn ("some symbol undefined; zero assumed");
2402 retval = absolute_section;
2403 expP->X_op = O_constant;
2404 expP->X_add_number = 0;
2406 know (retval == absolute_section || SEG_NORMAL (retval));
2408 } /* get_known_segmented_expression() */
2410 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2411 get_absolute_expression ()
2416 if (exp.X_op != O_constant)
2418 if (exp.X_op != O_absent)
2419 as_bad ("bad absolute expression; zero assumed");
2420 exp.X_add_number = 0;
2422 return exp.X_add_number;
2425 char /* return terminator */
2426 get_absolute_expression_and_terminator (val_pointer)
2427 long *val_pointer; /* return value of expression */
2429 *val_pointer = get_absolute_expression ();
2430 return (*input_line_pointer++);
2434 * demand_copy_C_string()
2436 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2437 * Give a warning if that happens.
2440 demand_copy_C_string (len_pointer)
2445 if ((s = demand_copy_string (len_pointer)) != 0)
2449 for (len = *len_pointer;
2458 as_bad ("This string may not contain \'\\0\'");
2466 * demand_copy_string()
2468 * Demand string, but return a safe (=private) copy of the string.
2469 * Return NULL if we can't read a string here.
2472 demand_copy_string (lenP)
2475 register unsigned int c;
2481 if (*input_line_pointer == '\"')
2483 input_line_pointer++; /* Skip opening quote. */
2485 while (is_a_char (c = next_char_of_string ()))
2487 obstack_1grow (¬es, c);
2490 /* JF this next line is so demand_copy_C_string will return a null
2491 termanated string. */
2492 obstack_1grow (¬es, '\0');
2493 retval = obstack_finish (¬es);
2497 as_warn ("Missing string");
2499 ignore_rest_of_line ();
2503 } /* demand_copy_string() */
2506 * is_it_end_of_statement()
2508 * In: Input_line_pointer->next character.
2510 * Do: Skip input_line_pointer over all whitespace.
2512 * Out: 1 if input_line_pointer->end-of-line.
2515 is_it_end_of_statement ()
2518 return (is_end_of_line[*input_line_pointer]);
2519 } /* is_it_end_of_statement() */
2525 register symbolS *symbolP; /* symbol we are working with */
2527 input_line_pointer++;
2528 if (*input_line_pointer == '=')
2529 input_line_pointer++;
2531 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2532 input_line_pointer++;
2534 if (sym_name[0] == '.' && sym_name[1] == '\0')
2536 /* Turn '. = mumble' into a .org mumble */
2537 register segT segment;
2541 segment = get_known_segmented_expression (&exp);
2544 if (segment != now_seg && segment != absolute_section)
2545 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2546 segment_name (segment),
2547 segment_name (now_seg));
2548 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2549 exp.X_add_number, (char *) 0);
2551 } /* if (ok to make frag) */
2555 symbolP = symbol_find_or_make (sym_name);
2556 pseudo_set (symbolP);
2560 /* .include -- include a file at this point. */
2573 filename = demand_copy_string (&i);
2574 demand_empty_rest_of_line ();
2575 path = xmalloc (i + include_dir_maxlen + 5 /* slop */ );
2576 for (i = 0; i < include_dir_count; i++)
2578 strcpy (path, include_dirs[i]);
2580 strcat (path, filename);
2581 if (0 != (try = fopen (path, "r")))
2590 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2591 newbuf = input_scrub_include_file (path, input_line_pointer);
2592 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2596 add_include_dir (path)
2601 if (include_dir_count == 0)
2603 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2604 include_dirs[0] = "."; /* Current dir */
2605 include_dir_count = 2;
2609 include_dir_count++;
2610 include_dirs = (char **) realloc (include_dirs,
2611 include_dir_count * sizeof (*include_dirs));
2614 include_dirs[include_dir_count - 1] = path; /* New one */
2617 if (i > include_dir_maxlen)
2618 include_dir_maxlen = i;
2619 } /* add_include_dir() */
2625 while (!is_end_of_line[*input_line_pointer])
2627 ++input_line_pointer;
2629 ++input_line_pointer;