1 /* read.c - read a source file -
2 Copyright (C) 1986, 1987, 1990, 1991 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
22 change this a bit. But then, GNU isn't
23 spozed to run on your machine anyway.
24 (RMS is so shortsighted sometimes.)
27 #define MASK_CHAR ((int)(unsigned char)-1)
31 /* This is the largest known floating point format (for now). It will
32 grow when we do 4361 style flonums. */
34 #define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
36 /* Routines that read assembler source text to build spagetti in memory.
37 Another group of these functions is in the expr.c module. */
51 #ifndef TC_START_LABEL
52 #define TC_START_LABEL(x,y) (x==':')
55 /* The NOP_OPCODE is for the alignment fill value.
56 * fill it a nop instruction so that the disassembler does not choke
60 #define NOP_OPCODE 0x00
63 char *input_line_pointer; /*->next char of source file to parse. */
65 #if BITS_PER_CHAR != 8
66 /* The following table is indexed by[(char)] and will break if
67 a char does not have exactly 256 states (hopefully 0:255!)! */
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_known_segmented_expression PARAMS ((expressionS * expP));
162 static void grow_bignum PARAMS ((void));
163 static void pobegin PARAMS ((void));
174 obj_read_begin_hook ();
176 obstack_begin (¬es, 5000);
177 obstack_begin (&cond_obstack, 960);
179 #define BIGNUM_BEGIN_SIZE (16)
180 bignum_low = xmalloc ((long) BIGNUM_BEGIN_SIZE);
181 bignum_limit = bignum_low + BIGNUM_BEGIN_SIZE;
183 /* Use machine dependent syntax */
184 for (p = line_separator_chars; *p; p++)
185 is_end_of_line[*p] = 1;
186 /* Use more. FIXME-SOMEDAY. */
189 /* set up pseudo-op tables */
191 struct hash_control *po_hash;
193 static const pseudo_typeS potable[] =
195 {"abort", s_abort, 0},
196 {"align", s_align_ptwo, 0},
197 {"ascii", stringer, 0},
198 {"asciz", stringer, 1},
204 {"double", float_cons, 'd'},
206 {"eject", listing_eject, 0}, /* Formfeed listing */
209 {"endif", s_endif, 0},
214 {"extern", s_ignore, 0}, /* We treat all undef as ext */
215 {"appfile", s_app_file, 1},
216 {"appline", s_app_line, 0},
217 {"file", s_app_file, 0},
219 {"float", float_cons, 'f'},
220 {"global", s_globl, 0},
221 {"globl", s_globl, 0},
224 {"ifdef", s_ifdef, 0},
225 {"ifeqs", s_ifeqs, 0},
226 {"ifndef", s_ifdef, 1},
227 {"ifnes", s_ifeqs, 1},
228 {"ifnotdef", s_ifdef, 1},
229 {"include", s_include, 0},
231 {"lcomm", s_lcomm, 0},
232 {"lflags", listing_flags, 0}, /* Listing flags */
233 {"list", listing_list, 1}, /* Turn listing on */
236 {"nolist", listing_list, 0}, /* Turn listing off */
237 {"octa", big_cons, 16},
239 {"psize", listing_psize, 0}, /* set paper size */
241 {"quad", big_cons, 8},
242 {"sbttl", listing_title, 1}, /* Subtitle of listing */
247 {"single", float_cons, 'f'},
249 {"space", s_space, 0},
252 {"title", listing_title, 0}, /* Listing title */
257 {NULL} /* end sentinel */
263 char *errtxt; /* error text */
264 const pseudo_typeS *pop;
266 po_hash = hash_new ();
268 /* Do the target-specific pseudo ops. */
269 for (pop = md_pseudo_table; pop->poc_name; pop++)
271 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
272 if (errtxt && *errtxt)
274 as_fatal ("error constructing md pseudo-op table");
278 /* Now object specific. Skip any that were in the target table. */
279 for (pop = obj_pseudo_table; pop->poc_name; pop++)
281 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
282 if (errtxt && *errtxt)
284 if (!strcmp (errtxt, "exists"))
286 #ifdef DIE_ON_OVERRIDES
287 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
288 #endif /* DIE_ON_OVERRIDES */
289 continue; /* OK if target table overrides. */
293 as_fatal ("error constructing obj pseudo-op table");
294 } /* if overridden */
298 /* Now portable ones. Skip any that we've seen already. */
299 for (pop = potable; pop->poc_name; pop++)
301 errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
302 if (errtxt && *errtxt)
304 if (!strcmp (errtxt, "exists"))
306 #ifdef DIE_ON_OVERRIDES
307 as_fatal ("pseudo op \".%s\" overridden.\n", pop->poc_name);
308 #endif /* DIE_ON_OVERRIDES */
309 continue; /* OK if target table overrides. */
313 as_fatal ("error constructing obj pseudo-op table");
314 } /* if overridden */
321 #define HANDLE_CONDITIONAL_ASSEMBLY() \
322 if (ignore_input ()) \
324 while (! is_end_of_line[*input_line_pointer++]) \
325 if (input_line_pointer == buffer_limit) \
331 /* read_a_source_file()
333 * We read the file, putting things into a web that
334 * represents what we have been reading.
337 read_a_source_file (name)
341 register char *s; /* string of symbol, '\0' appended */
345 buffer = input_scrub_new_file (name);
348 listing_newline ("");
350 while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
351 { /* We have another line to parse. */
352 know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
353 contin: /* JF this goto is my fault I admit it.
354 Someone brave please re-write the whole
355 input section here? Pleeze??? */
356 while (input_line_pointer < buffer_limit)
358 /* We have more of this buffer to parse. */
361 * We now have input_line_pointer->1st char of next line.
362 * If input_line_pointer [-1] == '\n' then we just
363 * scanned another line: so bump line counters.
365 if (input_line_pointer[-1] == '\n')
367 bump_line_counters ();
370 /* Text at the start of a line must be a label, we run down and stick a colon in */
371 if (is_name_beginner (*input_line_pointer))
373 char *line_start = input_line_pointer;
374 char c = get_symbol_end ();
376 *input_line_pointer = c;
378 input_line_pointer++;
386 * We are at the begining of a line, or similar place.
387 * We expect a well-formed assembler statement.
388 * A "symbol-name:" is a statement.
390 * Depending on what compiler is used, the order of these tests
391 * may vary to catch most common case 1st.
392 * Each test is independent of all other tests at the (top) level.
393 * PLEASE make a compiler that doesn't use this assembler.
394 * It is crufty to waste a compiler's time encoding things for this
395 * assembler, which then wastes more time decoding it.
396 * (And communicating via (linear) files is silly!
397 * If you must pass stuff, please pass a tree!)
399 if ((c = *input_line_pointer++) == '\t'
404 c = *input_line_pointer++;
406 know (c != ' '); /* No further leading whitespace. */
409 * C is the 1st significant character.
410 * Input_line_pointer points after that character.
412 if (is_name_beginner (c))
413 { /* want user-defined label or pseudo/opcode */
414 HANDLE_CONDITIONAL_ASSEMBLY ();
416 s = --input_line_pointer;
417 c = get_symbol_end (); /* name's delimiter */
419 * C is character after symbol.
420 * That character's place in the input line is now '\0'.
421 * S points to the beginning of the symbol.
422 * [In case of pseudo-op, s->'.'.]
423 * Input_line_pointer->'\0' where c was.
425 if (TC_START_LABEL(c, input_line_pointer))
427 colon (s); /* user-defined label */
428 *input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
429 /* Input_line_pointer->after ':'. */
434 else if (c == '=' || input_line_pointer[1] == '=')
437 demand_empty_rest_of_line ();
440 { /* expect pseudo-op or machine instruction */
442 if (!done_pseudo (s))
450 * WARNING: c has next char, which may be end-of-line.
451 * We lookup the pseudo-op table with s+1 because we
452 * already know that the pseudo-op begins with a '.'.
455 pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
457 /* Print the error msg now, while we still can */
460 as_bad ("Unknown pseudo-op: `%s'", s);
461 *input_line_pointer = c;
466 /* Put it back for error messages etc. */
467 *input_line_pointer = c;
468 /* The following skip of whitespace is compulsory.
469 A well shaped space is sometimes all that separates
470 keyword from operands. */
471 if (c == ' ' || c == '\t')
473 input_line_pointer++;
474 } /* Skip seperator after keyword. */
476 * Input_line is restored.
477 * Input_line_pointer->1st non-blank char
478 * after pseudo-operation.
482 ignore_rest_of_line ();
487 (*pop->poc_handler) (pop->poc_val);
488 } /* if we have one */
492 { /* machine instruction */
493 /* WARNING: c has char, which may be end-of-line. */
494 /* Also: input_line_pointer->`\0` where c was. */
495 *input_line_pointer = c;
496 while (!is_end_of_line[*input_line_pointer])
498 input_line_pointer++;
501 c = *input_line_pointer;
502 *input_line_pointer = '\0';
504 md_assemble (s); /* Assemble 1 instruction. */
506 *input_line_pointer++ = c;
508 /* We resume loop AFTER the end-of-line from this instruction */
513 } /* if (is_name_beginner(c) */
516 if (is_end_of_line[c])
519 } /* empty statement */
522 #if defined(LOCAL_LABELS_DOLLAR) || defined(LOCAL_LABELS_FB)
524 { /* local label ("4:") */
525 char *backup = input_line_pointer;
527 HANDLE_CONDITIONAL_ASSEMBLY ();
531 while (isdigit (*input_line_pointer))
533 temp = (temp * 10) + *input_line_pointer - '0';
534 ++input_line_pointer;
535 } /* read the whole number */
537 #ifdef LOCAL_LABELS_DOLLAR
538 if (*input_line_pointer == '$'
539 && *(input_line_pointer + 1) == ':')
541 input_line_pointer += 2;
543 if (dollar_label_defined (temp))
545 as_fatal ("label \"%d$\" redefined", temp);
548 define_dollar_label (temp);
549 colon (dollar_label_name (temp, 0));
552 #endif /* LOCAL_LABELS_DOLLAR */
554 #ifdef LOCAL_LABELS_FB
555 if (*input_line_pointer++ == ':')
557 fb_label_instance_inc (temp);
558 colon (fb_label_name (temp, 0));
561 #endif /* LOCAL_LABELS_FB */
563 input_line_pointer = backup;
564 } /* local label ("4:") */
565 #endif /* LOCAL_LABELS_DOLLAR or LOCAL_LABELS_FB */
567 if (c && strchr (line_comment_chars, c))
568 { /* Its a comment. Better say APP or NO_APP */
574 extern char *scrub_string, *scrub_last_string;
576 bump_line_counters ();
577 s = input_line_pointer;
578 if (strncmp (s, "APP\n", 4))
579 continue; /* We ignore it */
582 ends = strstr (s, "#NO_APP\n");
589 /* The end of the #APP wasn't in this buffer. We
590 keep reading in buffers until we find the #NO_APP
591 that goes with this #APP There is one. The specs
593 tmp_len = buffer_limit - s;
594 tmp_buf = xmalloc (tmp_len + 1);
595 bcopy (s, tmp_buf, tmp_len);
598 new_tmp = input_scrub_next_buffer (&buffer);
602 buffer_limit = new_tmp;
603 input_line_pointer = buffer;
604 ends = strstr (buffer, "#NO_APP\n");
608 num = buffer_limit - buffer;
610 tmp_buf = xrealloc (tmp_buf, tmp_len + num);
611 bcopy (buffer, tmp_buf + tmp_len, num);
616 input_line_pointer = ends ? ends + 8 : NULL;
624 input_line_pointer = ends + 8;
626 new_buf = xmalloc (100);
631 scrub_last_string = ends;
636 ch = do_scrub_next_char (scrub_from_string, scrub_to_string);
640 if (new_tmp == new_buf + new_length)
642 new_buf = xrealloc (new_buf, new_length + 100);
643 new_tmp = new_buf + new_length;
651 old_input = input_line_pointer;
652 old_limit = buffer_limit;
654 input_line_pointer = new_buf;
655 buffer_limit = new_tmp;
659 HANDLE_CONDITIONAL_ASSEMBLY ();
661 /* as_warn("Junk character %d.",c); Now done by ignore_rest */
662 input_line_pointer--; /* Report unknown char as ignored. */
663 ignore_rest_of_line ();
664 } /* while (input_line_pointer<buffer_limit) */
667 bump_line_counters ();
671 input_line_pointer = old_input;
672 buffer_limit = old_limit;
677 } /* while (more buffers to scan) */
678 input_scrub_close (); /* Close the input file */
680 } /* read_a_source_file() */
685 as_fatal (".abort detected. Abandoning ship.");
688 /* For machines where ".align 4" means align to a 4 byte boundary. */
693 register unsigned int temp;
694 register long temp_fill;
696 unsigned long max_alignment = 1 << 15;
698 if (is_end_of_line[*input_line_pointer])
699 temp = arg; /* Default value from pseudo-op table */
701 temp = get_absolute_expression ();
703 if (temp > max_alignment)
705 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
709 * For the sparc, `.align (1<<n)' actually means `.align n'
710 * so we have to convert it.
714 for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
718 as_bad ("Alignment not a power of 2");
721 if (*input_line_pointer == ',')
723 input_line_pointer++;
724 temp_fill = get_absolute_expression ();
726 else if (now_seg != data_section && now_seg != bss_section)
727 temp_fill = NOP_OPCODE;
730 /* Only make a frag if we HAVE to. . . */
731 if (temp && !need_pass_2)
732 frag_align (temp, (int) temp_fill);
734 record_alignment (now_seg, temp);
736 demand_empty_rest_of_line ();
737 } /* s_align_bytes() */
739 /* For machines where ".align 4" means align to 2**4 boundary. */
744 register long temp_fill;
745 long max_alignment = 15;
747 temp = get_absolute_expression ();
748 if (temp > max_alignment)
749 as_bad ("Alignment too large: %d. assumed.", temp = max_alignment);
752 as_bad ("Alignment negative. 0 assumed.");
755 if (*input_line_pointer == ',')
757 input_line_pointer++;
758 temp_fill = get_absolute_expression ();
760 /* @@ Fix this right for BFD! */
761 else if (now_seg != data_section && now_seg != bss_section)
762 temp_fill = NOP_OPCODE;
765 /* Only make a frag if we HAVE to. . . */
766 if (temp && !need_pass_2)
767 frag_align (temp, (int) temp_fill);
769 record_alignment (now_seg, temp);
771 demand_empty_rest_of_line ();
772 } /* s_align_ptwo() */
781 register symbolS *symbolP;
783 name = input_line_pointer;
784 c = get_symbol_end ();
785 /* just after name is now '\0' */
786 p = input_line_pointer;
789 if (*input_line_pointer != ',')
791 as_bad ("Expected comma after symbol-name: rest of line ignored.");
792 ignore_rest_of_line ();
795 input_line_pointer++; /* skip ',' */
796 if ((temp = get_absolute_expression ()) < 0)
798 as_warn (".COMMon length (%d.) <0! Ignored.", temp);
799 ignore_rest_of_line ();
803 symbolP = symbol_find_or_make (name);
805 if (S_IS_DEFINED (symbolP))
807 as_bad ("Ignoring attempt to re-define symbol");
808 ignore_rest_of_line ();
811 if (S_GET_VALUE (symbolP))
813 if (S_GET_VALUE (symbolP) != temp)
814 as_bad ("Length of .comm \"%s\" is already %d. Not changed to %d.",
815 S_GET_NAME (symbolP),
816 S_GET_VALUE (symbolP),
821 S_SET_VALUE (symbolP, temp);
822 S_SET_EXTERNAL (symbolP);
825 if ( (!temp) || !flagseen['1'])
826 S_GET_OTHER(symbolP) = const_flag;
827 #endif /* not OBJ_VMS */
828 know (symbolP->sy_frag == &zero_address_frag);
829 demand_empty_rest_of_line ();
837 temp = get_absolute_expression ();
839 subseg_set (data_section, (subsegT) temp);
841 subseg_new (data_section, (subsegT) temp);
847 demand_empty_rest_of_line ();
850 /* Handle the .appfile pseudo-op. This is automatically generated by
851 do_scrub_next_char when a preprocessor # line comment is seen with
852 a file name. This default definition may be overridden by the
853 object or CPU specific pseudo-ops. This function is also the
854 default definition for .file; the APPFILE argument is 1 for
855 .appfile, 0 for .file. */
864 /* Some assemblers tolerate immediately following '"' */
865 if ((s = demand_copy_string (&length)) != 0)
867 /* If this is a fake .appfile, a fake newline was inserted into
868 the buffer. Passing -2 to new_logical_line tells it to
870 new_logical_line (s, appfile ? -2 : -1);
871 demand_empty_rest_of_line ();
874 listing_source_file (s);
878 c_dot_file_symbol (s);
879 #endif /* OBJ_COFF */
885 /* Handle the .appline pseudo-op. This is automatically generated by
886 do_scrub_next_char when a preprocessor # line comment is seen.
887 This default definition may be overridden by the object or CPU
888 specific pseudo-ops. */
895 /* The given number is that of the next line. */
896 l = get_absolute_expression () - 1;
897 new_logical_line ((char *) NULL, l);
900 listing_source_line (l);
902 demand_empty_rest_of_line ();
908 long temp_repeat = 0;
910 register long temp_fill = 0;
914 temp_repeat = get_absolute_expression ();
915 if (*input_line_pointer == ',')
917 input_line_pointer++;
918 temp_size = get_absolute_expression ();
919 if (*input_line_pointer == ',')
921 input_line_pointer++;
922 temp_fill = get_absolute_expression ();
925 /* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
926 #define BSD_FILL_SIZE_CROCK_8 (8)
927 if (temp_size > BSD_FILL_SIZE_CROCK_8)
929 as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
930 temp_size = BSD_FILL_SIZE_CROCK_8;
934 as_warn ("Size negative: .fill ignored.");
937 else if (temp_repeat <= 0)
939 as_warn ("Repeat < 0, .fill ignored");
943 if (temp_size && !need_pass_2)
945 p = frag_var (rs_fill, (int) temp_size, (int) temp_size, (relax_substateT) 0, (symbolS *) 0, temp_repeat, (char *) 0);
946 memset (p, 0, (int) temp_size);
947 /* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
948 * flavoured AS. The following bizzare behaviour is to be
949 * compatible with above. I guess they tried to take up to 8
950 * bytes from a 4-byte expression and they forgot to sign
951 * extend. Un*x Sux. */
952 #define BSD_FILL_SIZE_CROCK_4 (4)
953 md_number_to_chars (p, temp_fill,
954 (temp_size > BSD_FILL_SIZE_CROCK_4
955 ? BSD_FILL_SIZE_CROCK_4
957 /* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
958 * but emits no error message because it seems a legal thing to do.
959 * It is a degenerate case of .fill but could be emitted by a compiler.
962 demand_empty_rest_of_line ();
974 name = input_line_pointer;
975 c = get_symbol_end ();
976 symbolP = symbol_find_or_make (name);
977 *input_line_pointer = c;
979 S_SET_EXTERNAL (symbolP);
982 input_line_pointer++;
984 if (*input_line_pointer == '\n')
989 demand_empty_rest_of_line ();
993 s_lcomm (needs_align)
994 /* 1 if this was a ".bss" directive, which may require a 3rd argument
995 (alignment); 0 if it was an ".lcomm" (2 args only) */
1002 register symbolS *symbolP;
1003 segT current_seg = now_seg;
1004 subsegT current_subseg = now_subseg;
1005 const int max_alignment = 15;
1007 segT bss_seg = bss_section;
1009 name = input_line_pointer;
1010 c = get_symbol_end ();
1011 p = input_line_pointer;
1014 if (*input_line_pointer != ',')
1016 as_bad ("Expected comma after name");
1017 ignore_rest_of_line ();
1021 ++input_line_pointer;
1023 if (*input_line_pointer == '\n')
1025 as_bad ("Missing size expression");
1029 if ((temp = get_absolute_expression ()) < 0)
1031 as_warn ("BSS length (%d.) <0! Ignored.", temp);
1032 ignore_rest_of_line ();
1038 /* For MIPS ECOFF, small objects are put in .sbss. */
1039 if (temp <= bfd_get_gp_size (stdoutput))
1040 bss_seg = subseg_new (".sbss", 1);
1048 if (*input_line_pointer != ',')
1050 as_bad ("Expected comma after size");
1051 ignore_rest_of_line ();
1054 input_line_pointer++;
1056 if (*input_line_pointer == '\n')
1058 as_bad ("Missing alignment");
1061 align = get_absolute_expression ();
1062 if (align > max_alignment)
1064 align = max_alignment;
1065 as_warn ("Alignment too large: %d. assumed.", align);
1070 as_warn ("Alignment negative. 0 assumed.");
1072 record_alignment (bss_seg, align);
1073 } /* if needs align */
1076 symbolP = symbol_find_or_make (name);
1080 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1081 S_GET_OTHER (symbolP) == 0 &&
1082 S_GET_DESC (symbolP) == 0 &&
1083 #endif /* OBJ_AOUT or OBJ_BOUT */
1084 (S_GET_SEGMENT (symbolP) == bss_seg
1085 || (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
1089 #ifdef BFD_ASSEMBLER
1090 subseg_set (bss_seg, 1);
1092 subseg_new (bss_seg, 1);
1096 frag_align (align, 0);
1097 /* detach from old frag */
1098 if (S_GET_SEGMENT (symbolP) == bss_seg)
1099 symbolP->sy_frag->fr_symbol = NULL;
1101 symbolP->sy_frag = frag_now;
1102 p = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
1106 S_SET_SEGMENT (symbolP, bss_seg);
1109 /* The symbol may already have been created with a preceding
1110 ".globl" directive -- be careful not to step on storage class
1111 in that case. Otherwise, set it to static. */
1112 if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
1114 S_SET_STORAGE_CLASS (symbolP, C_STAT);
1116 #endif /* OBJ_COFF */
1120 as_bad ("Ignoring attempt to re-define symbol %s.", name);
1123 #ifdef BFD_ASSEMBLER
1124 subseg_set (current_seg, current_subseg);
1126 subseg_new (current_seg, current_subseg);
1129 demand_empty_rest_of_line ();
1147 register char *name;
1150 register segT segment;
1152 register symbolS *symbolP;
1154 /* we permit ANY defined expression: BSD4.2 demands constants */
1155 name = input_line_pointer;
1156 c = get_symbol_end ();
1157 p = input_line_pointer;
1160 if (*input_line_pointer != ',')
1163 as_bad ("Expected comma after name \"%s\"", name);
1165 ignore_rest_of_line ();
1168 input_line_pointer++;
1169 segment = expression (&exp);
1170 if (segment != absolute_section
1171 && segment != reg_section
1172 && ! SEG_NORMAL (segment))
1174 as_bad ("Bad expression: %s", segment_name (segment));
1175 ignore_rest_of_line ();
1179 symbolP = symbol_find_or_make (name);
1181 /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
1182 symbolP->sy_desc == 0) out of this test because coff doesn't have
1183 those fields, and I can't see when they'd ever be tripped. I
1184 don't think I understand why they were here so I may have
1185 introduced a bug. As recently as 1.37 didn't have this test
1186 anyway. xoxorich. */
1188 if (S_GET_SEGMENT (symbolP) == undefined_section
1189 && S_GET_VALUE (symbolP) == 0)
1191 /* The name might be an undefined .global symbol; be sure to
1192 keep the "external" bit. */
1193 S_SET_SEGMENT (symbolP, segment);
1194 S_SET_VALUE (symbolP, (valueT) (exp.X_add_number));
1198 as_bad ("Symbol %s already defined", name);
1201 demand_empty_rest_of_line ();
1207 register segT segment;
1209 register long temp_fill;
1211 /* Don't believe the documentation of BSD 4.2 AS. There is no such
1212 thing as a sub-segment-relative origin. Any absolute origin is
1213 given a warning, then assumed to be segment-relative. Any
1214 segmented origin expression ("foo+42") had better be in the right
1215 segment or the .org is ignored.
1217 BSD 4.2 AS warns if you try to .org backwards. We cannot because
1218 we never know sub-segment sizes when we are reading code. BSD
1219 will crash trying to emit negative numbers of filler bytes in
1220 certain .orgs. We don't crash, but see as-write for that code.
1222 Don't make frag if need_pass_2==1. */
1223 segment = get_known_segmented_expression (&exp);
1224 if (*input_line_pointer == ',')
1226 input_line_pointer++;
1227 temp_fill = get_absolute_expression ();
1233 if (segment != now_seg && segment != absolute_section)
1234 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1235 segment_name (segment), segment_name (now_seg));
1236 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1237 exp.X_add_number, (char *) 0);
1239 } /* if (ok to make frag) */
1240 demand_empty_rest_of_line ();
1246 register char *name;
1247 register char delim;
1248 register char *end_name;
1249 register symbolS *symbolP;
1252 * Especial apologies for the random logic:
1253 * this just grew, and could be parsed much more simply!
1256 name = input_line_pointer;
1257 delim = get_symbol_end ();
1258 end_name = input_line_pointer;
1262 if (*input_line_pointer != ',')
1265 as_bad ("Expected comma after name \"%s\"", name);
1267 ignore_rest_of_line ();
1271 input_line_pointer++;
1274 if (name[0] == '.' && name[1] == '\0')
1276 /* Turn '. = mumble' into a .org mumble */
1277 register segT segment;
1281 segment = get_known_segmented_expression (&exp);
1285 if (segment != now_seg && segment != absolute_section)
1286 as_bad ("Invalid segment \"%s\". Segment \"%s\" assumed.",
1287 segment_name (segment),
1288 segment_name (now_seg));
1289 ptr = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
1290 exp.X_add_number, (char *) 0);
1292 } /* if (ok to make frag) */
1298 if ((symbolP = symbol_find (name)) == NULL
1299 && (symbolP = md_undefined_symbol (name)) == NULL)
1301 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1303 /* "set" symbols are local unless otherwise specified. */
1304 SF_SET_LOCAL (symbolP);
1305 #endif /* OBJ_COFF */
1307 } /* make a new symbol */
1309 symbol_table_insert (symbolP);
1312 pseudo_set (symbolP);
1313 demand_empty_rest_of_line ();
1321 register long temp_fill;
1324 /* Just like .fill, but temp_size = 1 */
1325 if (get_absolute_expression_and_terminator (&temp_repeat) == ',')
1327 temp_fill = get_absolute_expression ();
1331 input_line_pointer--; /* Backup over what was not a ','. */
1336 temp_repeat *= mult;
1338 if (temp_repeat <= 0)
1340 as_warn ("Repeat < 0, .space ignored");
1341 ignore_rest_of_line ();
1346 p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
1347 temp_repeat, (char *) 0);
1350 demand_empty_rest_of_line ();
1358 temp = get_absolute_expression ();
1359 #ifdef BFD_ASSEMBLER
1360 subseg_set (text_section, (subsegT) temp);
1362 subseg_new (text_section, (subsegT) temp);
1364 demand_empty_rest_of_line ();
1369 demand_empty_rest_of_line ()
1372 if (is_end_of_line[*input_line_pointer])
1374 input_line_pointer++;
1378 ignore_rest_of_line ();
1380 /* Return having already swallowed end-of-line. */
1381 } /* Return pointing just after end-of-line. */
1384 ignore_rest_of_line () /* For suspect lines: gives warning. */
1386 if (!is_end_of_line[*input_line_pointer])
1388 if (isprint (*input_line_pointer))
1389 as_bad ("Rest of line ignored. First ignored character is `%c'.",
1390 *input_line_pointer);
1392 as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
1393 *input_line_pointer);
1394 while (input_line_pointer < buffer_limit
1395 && !is_end_of_line[*input_line_pointer])
1397 input_line_pointer++;
1400 input_line_pointer++; /* Return pointing just after end-of-line. */
1401 know (is_end_of_line[input_line_pointer[-1]]);
1407 * In: Pointer to a symbol.
1408 * Input_line_pointer->expression.
1410 * Out: Input_line_pointer->just after any whitespace after expression.
1411 * Tried to set symbol to value of expression.
1412 * Will change symbols type, value, and frag;
1413 * May set need_pass_2 == 1.
1416 pseudo_set (symbolP)
1420 register segT segment;
1421 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1423 #endif /* OBJ_AOUT or OBJ_BOUT */
1425 know (symbolP); /* NULL pointer is logic error. */
1426 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1427 /* @@ Fix this right for BFD. */
1428 ext = S_IS_EXTERNAL (symbolP);
1429 #endif /* OBJ_AOUT or OBJ_BOUT */
1431 if ((segment = expression (&exp)) == absent_section)
1433 as_bad ("Missing expression: absolute 0 assumed");
1434 exp.X_seg = absolute_section;
1435 exp.X_add_number = 0;
1438 if (segment == reg_section)
1440 S_SET_SEGMENT (symbolP, reg_section);
1441 S_SET_VALUE (symbolP, exp.X_add_number);
1442 symbolP->sy_frag = &zero_address_frag;
1444 else if (segment == big_section)
1446 as_bad ("%s number invalid. Absolute 0 assumed.",
1447 exp.X_add_number > 0 ? "Bignum" : "Floating-Point");
1448 S_SET_SEGMENT (symbolP, absolute_section);
1449 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1450 /* @@ Fix this right for BFD. */
1451 ext ? S_SET_EXTERNAL (symbolP) :
1452 S_CLEAR_EXTERNAL (symbolP);
1453 #endif /* OBJ_AOUT or OBJ_BOUT */
1454 S_SET_VALUE (symbolP, 0);
1455 symbolP->sy_frag = &zero_address_frag;
1457 else if (segment == absent_section)
1459 as_warn ("No expression: Using absolute 0");
1460 S_SET_SEGMENT (symbolP, absolute_section);
1461 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1462 /* @@ Fix this right for BFD. */
1463 ext ? S_SET_EXTERNAL (symbolP) :
1464 S_CLEAR_EXTERNAL (symbolP);
1465 #endif /* OBJ_AOUT or OBJ_BOUT */
1466 S_SET_VALUE (symbolP, 0);
1467 symbolP->sy_frag = &zero_address_frag;
1469 else if (segment == diff_section)
1471 if (exp.X_add_symbol && exp.X_subtract_symbol
1472 && (S_GET_SEGMENT (exp.X_add_symbol) ==
1473 S_GET_SEGMENT (exp.X_subtract_symbol)))
1475 if (exp.X_add_symbol->sy_frag == exp.X_subtract_symbol->sy_frag)
1477 exp.X_add_number += S_GET_VALUE (exp.X_add_symbol) -
1478 S_GET_VALUE (exp.X_subtract_symbol);
1481 symbolP->sy_value = exp;
1485 as_bad ("Complex expression. Absolute segment assumed.");
1489 else if (segment == absolute_section)
1492 S_SET_SEGMENT (symbolP, absolute_section);
1493 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1494 /* @@ Fix this right for BFD. */
1495 ext ? S_SET_EXTERNAL (symbolP) :
1496 S_CLEAR_EXTERNAL (symbolP);
1497 #endif /* OBJ_AOUT or OBJ_BOUT */
1498 S_SET_VALUE (symbolP, exp.X_add_number);
1499 symbolP->sy_frag = &zero_address_frag;
1501 else if (segment == pass1_section)
1503 symbolP->sy_value.X_add_symbol = exp.X_add_symbol;
1504 symbolP->sy_value.X_subtract_symbol = NULL;
1505 symbolP->sy_value.X_add_number = 0;
1506 symbolP->sy_value.X_seg = undefined_section;
1507 as_bad ("Unknown expression");
1508 know (need_pass_2 == 1);
1510 else if (segment == undefined_section)
1512 symbolP->sy_value.X_add_symbol = exp.X_add_symbol;
1513 symbolP->sy_value.X_subtract_symbol = NULL;
1514 symbolP->sy_value.X_add_number = 0;
1515 symbolP->sy_value.X_seg = undefined_section;
1519 #ifndef BFD_ASSEMBLER
1520 #ifndef MANY_SEGMENTS
1529 as_fatal ("failed sanity check.");
1530 } /* switch on segment */
1533 S_SET_SEGMENT (symbolP, segment);
1534 #if defined(OBJ_AOUT) | defined(OBJ_BOUT)
1535 /* @@ Fix this right for BFD! */
1538 S_SET_EXTERNAL (symbolP);
1542 S_CLEAR_EXTERNAL (symbolP);
1544 #endif /* OBJ_AOUT or OBJ_BOUT */
1546 S_SET_VALUE (symbolP, exp.X_add_number + S_GET_VALUE (exp.X_add_symbol));
1547 symbolP->sy_frag = exp.X_add_symbol->sy_frag;
1554 * CONStruct more frag of .bytes, or .words etc.
1555 * Should need_pass_2 be 1 then emit no frag(s).
1556 * This understands EXPRESSIONS, as opposed to big_cons().
1560 * This has a split personality. We use expression() to read the
1561 * value. We can detect if the value won't fit in a byte or word.
1562 * But we can't detect if expression() discarded significant digits
1563 * in the case of a long. Not worth the crocks required to fix it.
1566 /* Select a parser for cons expressions. */
1568 /* Some targets need to parse the expression in various fancy ways.
1569 You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
1570 (for example, the HPPA does this). Otherwise, you can define
1571 BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
1572 REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
1573 are defined, which is the normal case, then only simple expressions
1576 #ifndef TC_PARSE_CONS_EXPRESSION
1577 #ifdef BITFIELD_CONS_EXPRESSIONS
1578 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
1580 parse_bitfield_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1583 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_mri_cons (EXP)
1585 parse_mri_cons PARAMS ((expressionS *exp));
1587 #ifdef REPEAT_CONS_EXPRESSIONS
1588 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
1590 parse_repeat_cons PARAMS ((expressionS *exp, unsigned int nbytes));
1593 /* If we haven't gotten one yet, just call expression. */
1594 #ifndef TC_PARSE_CONS_EXPRESSION
1595 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
1599 /* worker to do .byte etc statements */
1600 /* clobbers input_line_pointer, checks */
1604 register unsigned int nbytes; /* 1=.byte, 2=.word, 4=.long */
1608 if (is_it_end_of_statement ())
1610 demand_empty_rest_of_line ();
1616 TC_PARSE_CONS_EXPRESSION (&exp, nbytes);
1617 emit_expr (&exp, nbytes);
1619 while (*input_line_pointer++ == ',');
1621 input_line_pointer--; /* Put terminator back into stream. */
1622 demand_empty_rest_of_line ();
1625 /* Put the contents of expression EXP into the object file using
1626 NBYTES bytes. If need_pass_2 is 1, this does nothing. */
1629 emit_expr (exp, nbytes)
1631 unsigned int nbytes;
1636 /* Don't do anything if we are going to make another pass. */
1640 segment = exp->X_seg;
1642 /* Don't call this if we are going to junk this pass anyway! */
1643 know (segment != pass1_section);
1645 if (segment == diff_section && exp->X_add_symbol == NULL)
1647 as_bad ("Subtracting symbol \"%s\" (segment \"%s\") is too hard. Absolute segment assumed.",
1648 S_GET_NAME (exp->X_subtract_symbol),
1649 segment_name (S_GET_SEGMENT (exp->X_subtract_symbol)));
1650 segment = absolute_section;
1651 /* Leave exp->X_add_number alone. */
1653 else if (segment == absent_section)
1655 as_warn ("0 assumed for missing expression");
1656 exp->X_add_number = 0;
1657 know (exp->X_add_symbol == NULL);
1658 segment = absolute_section;
1660 else if (segment == big_section)
1662 as_bad ("%s number invalid. Absolute 0 assumed.",
1663 exp->X_add_number > 0 ? "Bignum" : "Floating-Point");
1664 exp->X_add_number = 0;
1665 segment = absolute_section;
1668 p = frag_more (nbytes);
1670 #ifndef WORKING_DOT_WORD
1671 /* If we have the difference of two symbols in a word, save it on
1672 the broken_words list. See the code in write.c. */
1673 if (segment == diff_section && nbytes == 2)
1675 struct broken_word *x;
1677 x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
1678 x->next_broken_word = broken_words;
1681 x->word_goes_here = p;
1683 x->add = exp->X_add_symbol;
1684 x->sub = exp->X_subtract_symbol;
1685 x->addnum = exp->X_add_number;
1692 if (segment == absolute_section)
1697 register long unmask;
1699 /* JF << of >= number of bits in the object is undefined. In
1700 particular SPARC (Sun 4) has problems */
1701 if (nbytes >= sizeof (long))
1704 mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
1706 unmask = ~mask; /* Do store these bits. */
1709 "Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
1710 mask = ~(unmask >> 1); /* Includes sign bit now. */
1713 get = exp->X_add_number;
1715 if ((get & mask) != 0 && (get & mask) != mask)
1716 { /* Leading bits contain both 0s & 1s. */
1717 as_warn ("Value 0x%x truncated to 0x%x.", get, use);
1719 md_number_to_chars (p, use, nbytes); /* put bytes in right order. */
1723 md_number_to_chars (p, (long) 0, nbytes);
1725 /* Now we need to generate a fixS to record the symbol value.
1726 This is easy for BFD. For other targets it can be more
1727 complex. For very complex cases (currently, the HPPA and
1728 NS32K), you can define TC_CONS_FIX_NEW to do whatever you
1729 want. For simpler cases, you can define TC_CONS_RELOC to be
1730 the name of the reloc code that should be stored in the fixS.
1731 If neither is defined, the code uses NO_RELOC if it is
1732 defined, and otherwise uses 0. */
1734 #ifdef BFD_ASSEMBLER
1735 fix_new (frag_now, p - frag_now->fr_literal, nbytes,
1736 exp->X_add_symbol, exp->X_subtract_symbol,
1737 exp->X_add_number, 0,
1738 /* @@ Should look at CPU word size. */
1741 #ifdef TC_CONS_FIX_NEW
1742 TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
1744 /* Figure out which reloc number to use. Use TC_CONS_RELOC if
1745 it is defined, otherwise use NO_RELOC if it is defined,
1747 #ifndef TC_CONS_RELOC
1749 #define TC_CONS_RELOC NO_RELOC
1751 #define TC_CONS_RELOC 0
1754 fix_new (frag_now, p - frag_now->fr_literal, nbytes,
1755 exp->X_add_symbol, exp->X_subtract_symbol,
1756 exp->X_add_number, 0, TC_CONS_RELOC);
1757 #endif /* TC_CONS_FIX_NEW */
1758 #endif /* BFD_ASSEMBLER */
1762 #ifdef BITFIELD_CONS_EXPRESSIONS
1764 /* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
1765 w:x,y:z, where w and y are bitwidths and x and y are values. They
1766 then pack them all together. We do a little better in that we allow
1767 them in words, longs, etc. and we'll pack them in target byte order
1770 The rules are: pack least significat bit first, if a field doesn't
1771 entirely fit, put it in the next unit. Overflowing the bitfield is
1772 explicitly *not* even a warning. The bitwidth should be considered
1775 To use this function the tc-XXX.h file should define
1776 BITFIELD_CONS_EXPRESSIONS. */
1779 parse_bitfield_cons (exp, nbytes)
1781 unsigned int nbytes;
1783 unsigned int bits_available = BITS_PER_CHAR * nbytes;
1784 char *hold = input_line_pointer;
1787 segment = expression (exp);
1789 if (*input_line_pointer == ':')
1795 unsigned long width;
1797 if (*input_line_pointer != ':')
1799 input_line_pointer = hold;
1801 } /* next piece is not a bitfield */
1803 /* In the general case, we can't allow
1804 full expressions with symbol
1805 differences and such. The relocation
1806 entries for symbols not defined in this
1807 assembly would require arbitrary field
1808 widths, positions, and masks which most
1809 of our current object formats don't
1812 In the specific case where a symbol
1813 *is* defined in this assembly, we
1814 *could* build fixups and track it, but
1815 this could lead to confusion for the
1816 backends. I'm lazy. I'll take any
1817 SEG_ABSOLUTE. I think that means that
1818 you can use a previous .set or
1819 .equ type symbol. xoxorich. */
1821 if (segment == absent_section)
1823 as_warn ("Using a bit field width of zero.");
1824 exp->X_add_number = 0;
1825 segment = absolute_section;
1826 } /* implied zero width bitfield */
1828 if (segment != absolute_section)
1830 *input_line_pointer = '\0';
1831 as_bad ("Field width \"%s\" too complex for a bitfield.\n", hold);
1832 *input_line_pointer = ':';
1833 demand_empty_rest_of_line ();
1837 if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
1839 as_warn ("Field width %d too big to fit in %d bytes: truncated to %d bits.",
1840 width, nbytes, (BITS_PER_CHAR * nbytes));
1841 width = BITS_PER_CHAR * nbytes;
1844 if (width > bits_available)
1846 /* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
1847 input_line_pointer = hold;
1848 exp->X_add_number = value;
1852 hold = ++input_line_pointer; /* skip ':' */
1854 if ((segment = expression (exp)) != absolute_section)
1856 char cache = *input_line_pointer;
1858 *input_line_pointer = '\0';
1859 as_bad ("Field value \"%s\" too complex for a bitfield.\n", hold);
1860 *input_line_pointer = cache;
1861 demand_empty_rest_of_line ();
1865 value |= (~(-1 << width) & exp->X_add_number)
1866 << ((BITS_PER_CHAR * nbytes) - bits_available);
1868 if ((bits_available -= width) == 0
1869 || is_it_end_of_statement ()
1870 || *input_line_pointer != ',')
1873 } /* all the bitfields we're gonna get */
1875 hold = ++input_line_pointer;
1876 segment = expression (exp);
1877 } /* forever loop */
1879 exp->X_add_number = value;
1880 exp->X_seg = absolute_section;
1881 } /* if looks like a bitfield */
1882 } /* parse_bitfield_cons() */
1884 #endif /* BITFIELD_CONS_EXPRESSIONS */
1889 parse_mri_cons (exp, nbytes)
1891 unsigned int nbytes;
1893 if (*input_line_pointer == '\'')
1895 /* An MRI style string, cut into as many bytes as will fit into
1896 a nbyte chunk, left justify if necessary, and separate with
1897 commas so we can try again later */
1899 unsigned int result = 0;
1900 input_line_pointer++;
1901 for (scan = 0; scan < nbytes; scan++)
1903 if (*input_line_pointer == '\'')
1905 if (input_line_pointer[1] == '\'')
1907 input_line_pointer++;
1912 result = (result << 8) | (*input_line_pointer++);
1916 while (scan < nbytes)
1921 /* Create correct expression */
1922 exp->X_add_symbol = 0;
1923 exp->X_add_number = result;
1924 exp->X_seg = absolute_section;
1925 /* Fake it so that we can read the next char too */
1926 if (input_line_pointer[0] != '\'' ||
1927 (input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
1929 input_line_pointer -= 2;
1930 input_line_pointer[0] = ',';
1931 input_line_pointer[1] = '\'';
1934 input_line_pointer++;
1942 #ifdef REPEAT_CONS_EXPRESSIONS
1944 /* Parse a repeat expression for cons. This is used by the MIPS
1945 assembler. The format is NUMBER:COUNT; NUMBER appears in the
1946 object file COUNT times.
1948 To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
1951 parse_repeat_cons (exp, nbytes)
1953 unsigned int nbytes;
1961 if (*input_line_pointer != ':')
1963 /* No repeat count. */
1967 ++input_line_pointer;
1968 segment = expression (&count);
1969 if (segment != absolute_section
1970 || count.X_add_number <= 0)
1972 as_warn ("Unresolvable or nonpositive repeat count; using 1");
1976 /* The cons function is going to output this expression once. So we
1977 output it count - 1 times. */
1978 for (i = count.X_add_number - 1; i > 0; i--)
1979 emit_expr (exp, nbytes);
1982 #endif /* REPEAT_CONS_EXPRESSIONS */
1987 * CONStruct more frag(s) of .quads, or .octa etc.
1988 * Makes 0 or more new frags.
1989 * If need_pass_2 == 1, generate no frag.
1990 * This understands only bignums, not expressions. Cons() understands
1993 * Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
1995 * This creates objects with struct obstack_control objs, destroying
1996 * any context objs held about a partially completed object. Beware!
1999 * I think it sucks to have 2 different types of integers, with 2
2000 * routines to read them, store them etc.
2001 * It would be nicer to permit bignums in expressions and only
2002 * complain if the result overflowed. However, due to "efficiency"...
2004 /* worker to do .quad etc statements */
2005 /* clobbers input_line_pointer, checks */
2007 /* 8=.quad 16=.octa ... */
2011 register int nbytes;
2013 register char c; /* input_line_pointer->c. */
2015 register long length; /* Number of chars in an object. */
2016 register int digit; /* Value of 1 digit. */
2017 register int carry; /* For multi-precision arithmetic. */
2018 register int work; /* For multi-precision arithmetic. */
2019 register char *p; /* For multi-precision arithmetic. */
2021 extern const char hex_value[]; /* In hex_value.c. */
2024 * The following awkward logic is to parse ZERO or more strings,
2025 * comma seperated. Recall an expression includes its leading &
2026 * trailing blanks. We fake a leading ',' if there is (supposed to
2027 * be) a 1st expression, and keep demanding 1 expression for each ','.
2029 if (is_it_end_of_statement ())
2031 c = 0; /* Skip loop. */
2035 c = ','; /* Do loop. */
2036 --input_line_pointer;
2040 ++input_line_pointer;
2042 c = *input_line_pointer;
2043 /* C contains 1st non-blank character of what we hope is a number. */
2046 c = *++input_line_pointer;
2047 if (c == 'x' || c == 'X')
2049 c = *++input_line_pointer;
2062 * This feature (?) is here to stop people worrying about
2063 * mysterious zero constants: which is what they get when
2064 * they completely omit digits.
2066 if (hex_value[c] >= radix)
2068 as_bad ("Missing digits. 0 assumed.");
2070 bignum_high = bignum_low - 1; /* Start constant with 0 chars. */
2071 for (; (digit = hex_value[c]) < radix; c = *++input_line_pointer)
2073 /* Multiply existing number by radix, then add digit. */
2075 for (p = bignum_low; p <= bignum_high; p++)
2077 work = (*p & MASK_CHAR) * radix + carry;
2078 *p = work & MASK_CHAR;
2079 carry = work >> BITS_PER_CHAR;
2084 *bignum_high = carry & MASK_CHAR;
2085 know ((carry & ~MASK_CHAR) == 0);
2088 length = bignum_high - bignum_low + 1;
2089 if (length > nbytes)
2091 as_warn ("Most significant bits truncated in integer constant.");
2095 register long leading_zeroes;
2097 for (leading_zeroes = nbytes - length;
2107 char *src = bignum_low;
2108 p = frag_more (nbytes);
2109 if (target_big_endian)
2112 for (i = nbytes - 1; i >= 0; i--)
2116 bcopy (bignum_low, p, (int) nbytes);
2118 /* C contains character after number. */
2120 c = *input_line_pointer;
2121 /* C contains 1st non-blank character after number. */
2123 demand_empty_rest_of_line ();
2126 /* Extend bignum by 1 char. */
2130 register long length;
2133 if (bignum_high >= bignum_limit)
2135 length = bignum_limit - bignum_low;
2136 bignum_low = xrealloc (bignum_low, length + length);
2137 bignum_high = bignum_low + length;
2138 bignum_limit = bignum_low + length + length;
2140 } /* grow_bignum(); */
2145 * CONStruct some more frag chars of .floats .ffloats etc.
2146 * Makes 0 or more new frags.
2147 * If need_pass_2 == 1, no frags are emitted.
2148 * This understands only floating literals, not expressions. Sorry.
2150 * A floating constant is defined by atof_generic(), except it is preceded
2151 * by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
2152 * reading, I decided to be incompatible. This always tries to give you
2153 * rounded bits to the precision of the pseudo-op. Former AS did premature
2154 * truncatation, restored noisy bits instead of trailing 0s AND gave you
2155 * a choice of 2 flavours of noise according to which of 2 floating-point
2156 * scanners you directed AS to use.
2158 * In: input_line_pointer->whitespace before, or '0' of flonum.
2162 void /* JF was static, but can't be if VAX.C is goning to use it */
2163 float_cons (float_type) /* Worker to do .float etc statements. */
2164 /* Clobbers input_line-pointer, checks end-of-line. */
2165 register int float_type; /* 'f':.ffloat ... 'F':.float ... */
2168 int length; /* Number of chars in an object. */
2169 register char *err; /* Error from scanning floating literal. */
2170 char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
2172 if (is_it_end_of_statement ())
2174 demand_empty_rest_of_line ();
2180 /* input_line_pointer->1st char of a flonum (we hope!). */
2183 /* Skip any 0{letter} that may be present. Don't even check if the
2184 * letter is legal. Someone may invent a "z" format and this routine
2185 * has no use for such information. Lusers beware: you get
2186 * diagnostics if your input is ill-conditioned.
2188 if (input_line_pointer[0] == '0' && isalpha (input_line_pointer[1]))
2189 input_line_pointer += 2;
2191 err = md_atof (float_type, temp, &length);
2192 know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
2196 as_bad ("Bad floating literal: %s", err);
2197 ignore_rest_of_line ();
2207 #ifdef REPEAT_CONS_EXPRESSIONS
2208 if (*input_line_pointer == ':')
2211 expressionS count_exp;
2213 ++input_line_pointer;
2214 segment = expression (&count_exp);
2215 if (segment != absolute_section
2216 || count_exp.X_add_number <= 0)
2218 as_warn ("Unresolvable or nonpositive repeat count; using 1");
2221 count = count_exp.X_add_number;
2225 while (--count >= 0)
2227 p = frag_more (length);
2228 bcopy (temp, p, length);
2233 while (*input_line_pointer++ == ',');
2235 --input_line_pointer; /* Put terminator back into stream. */
2236 demand_empty_rest_of_line ();
2237 } /* float_cons() */
2242 * We read 0 or more ',' seperated, double-quoted strings.
2244 * Caller should have checked need_pass_2 is FALSE because we don't check it.
2249 stringer (append_zero) /* Worker to do .ascii etc statements. */
2250 /* Checks end-of-line. */
2251 register int append_zero; /* 0: don't append '\0', else 1 */
2253 register unsigned int c;
2256 * The following awkward logic is to parse ZERO or more strings,
2257 * comma seperated. Recall a string expression includes spaces
2258 * before the opening '\"' and spaces after the closing '\"'.
2259 * We fake a leading ',' if there is (supposed to be)
2260 * a 1st, expression. We keep demanding expressions for each
2263 if (is_it_end_of_statement ())
2265 c = 0; /* Skip loop. */
2266 ++input_line_pointer; /* Compensate for end of loop. */
2270 c = ','; /* Do loop. */
2272 while (c == ',' || c == '<' || c == '"')
2275 switch (*input_line_pointer)
2278 ++input_line_pointer; /*->1st char of string. */
2279 while (is_a_char (c = next_char_of_string ()))
2281 FRAG_APPEND_1_CHAR (c);
2285 FRAG_APPEND_1_CHAR (0);
2287 know (input_line_pointer[-1] == '\"');
2290 input_line_pointer++;
2291 c = get_single_number ();
2292 FRAG_APPEND_1_CHAR (c);
2293 if (*input_line_pointer != '>')
2295 as_bad ("Expected <nn>");
2297 input_line_pointer++;
2300 input_line_pointer++;
2304 c = *input_line_pointer;
2307 demand_empty_rest_of_line ();
2310 /* FIXME-SOMEDAY: I had trouble here on characters with the
2311 high bits set. We'll probably also have trouble with
2312 multibyte chars, wide chars, etc. Also be careful about
2313 returning values bigger than 1 byte. xoxorich. */
2316 next_char_of_string ()
2318 register unsigned int c;
2320 c = *input_line_pointer++ & CHAR_MASK;
2328 switch (c = *input_line_pointer++)
2358 break; /* As itself. */
2373 for (number = 0; isdigit (c); c = *input_line_pointer++)
2375 number = number * 8 + c - '0';
2379 --input_line_pointer;
2383 /* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
2384 as_warn ("Unterminated string: Newline inserted.");
2390 #ifdef ONLY_STANDARD_ESCAPES
2391 as_bad ("Bad escaped character in string, '?' assumed");
2393 #endif /* ONLY_STANDARD_ESCAPES */
2396 } /* switch on escaped char */
2401 } /* switch on char */
2403 } /* next_char_of_string() */
2406 get_segmented_expression (expP)
2407 register expressionS *expP;
2409 register segT retval;
2411 retval = expression (expP);
2412 if (retval == pass1_section
2413 || retval == absent_section
2414 || retval == big_section)
2416 as_bad ("Expected address expression: absolute 0 assumed");
2417 retval = expP->X_seg = absolute_section;
2418 expP->X_add_number = 0;
2419 expP->X_add_symbol = expP->X_subtract_symbol = 0;
2421 return (retval); /* SEG_ ABSOLUTE,UNKNOWN,DATA,TEXT,BSS */
2425 get_known_segmented_expression (expP)
2426 register expressionS *expP;
2428 register segT retval;
2429 register CONST char *name1;
2430 register CONST char *name2;
2432 if ((retval = get_segmented_expression (expP)) == undefined_section)
2434 name1 = expP->X_add_symbol ? S_GET_NAME (expP->X_add_symbol) : "";
2435 name2 = expP->X_subtract_symbol ?
2436 S_GET_NAME (expP->X_subtract_symbol) :
2440 as_warn ("Symbols \"%s\" \"%s\" are undefined: absolute 0 assumed.",
2445 as_warn ("Symbol \"%s\" undefined: absolute 0 assumed.",
2446 name1 ? name1 : name2);
2448 retval = expP->X_seg = absolute_section;
2449 expP->X_add_number = 0;
2450 expP->X_add_symbol = expP->X_subtract_symbol = NULL;
2452 know (retval == absolute_section
2453 || retval == diff_section
2454 || SEG_NORMAL (retval));
2457 } /* get_known_segmented_expression() */
2461 /* static */ long /* JF was static, but can't be if the MD pseudos are to use it */
2462 get_absolute_expression ()
2467 if ((s = expression (&exp)) != absolute_section)
2469 if (s != absent_section)
2471 as_bad ("Bad Absolute Expression, absolute 0 assumed.");
2473 exp.X_add_number = 0;
2475 return (exp.X_add_number);
2478 char /* return terminator */
2479 get_absolute_expression_and_terminator (val_pointer)
2480 long *val_pointer; /* return value of expression */
2482 *val_pointer = get_absolute_expression ();
2483 return (*input_line_pointer++);
2487 * demand_copy_C_string()
2489 * Like demand_copy_string, but return NULL if the string contains any '\0's.
2490 * Give a warning if that happens.
2493 demand_copy_C_string (len_pointer)
2498 if ((s = demand_copy_string (len_pointer)) != 0)
2502 for (len = *len_pointer;
2511 as_bad ("This string may not contain \'\\0\'");
2519 * demand_copy_string()
2521 * Demand string, but return a safe (=private) copy of the string.
2522 * Return NULL if we can't read a string here.
2525 demand_copy_string (lenP)
2528 register unsigned int c;
2534 if (*input_line_pointer == '\"')
2536 input_line_pointer++; /* Skip opening quote. */
2538 while (is_a_char (c = next_char_of_string ()))
2540 obstack_1grow (¬es, c);
2543 /* JF this next line is so demand_copy_C_string will return a null
2544 termanated string. */
2545 obstack_1grow (¬es, '\0');
2546 retval = obstack_finish (¬es);
2550 as_warn ("Missing string");
2552 ignore_rest_of_line ();
2556 } /* demand_copy_string() */
2559 * is_it_end_of_statement()
2561 * In: Input_line_pointer->next character.
2563 * Do: Skip input_line_pointer over all whitespace.
2565 * Out: 1 if input_line_pointer->end-of-line.
2568 is_it_end_of_statement ()
2571 return (is_end_of_line[*input_line_pointer]);
2572 } /* is_it_end_of_statement() */
2578 register symbolS *symbolP; /* symbol we are working with */
2580 input_line_pointer++;
2581 if (*input_line_pointer == '=')
2582 input_line_pointer++;
2584 while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
2585 input_line_pointer++;
2587 if (sym_name[0] == '.' && sym_name[1] == '\0')
2589 /* Turn '. = mumble' into a .org mumble */
2590 register segT segment;
2594 segment = get_known_segmented_expression (&exp);
2597 if (segment != now_seg && segment != absolute_section)
2598 as_warn ("Illegal segment \"%s\". Segment \"%s\" assumed.",
2599 segment_name (segment),
2600 segment_name (now_seg));
2601 p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp.X_add_symbol,
2602 exp.X_add_number, (char *) 0);
2604 } /* if (ok to make frag) */
2608 symbolP = symbol_find_or_make (sym_name);
2609 pseudo_set (symbolP);
2613 /* .include -- include a file at this point. */
2626 filename = demand_copy_string (&i);
2627 demand_empty_rest_of_line ();
2628 path = xmalloc (i + include_dir_maxlen + 5 /* slop */ );
2629 for (i = 0; i < include_dir_count; i++)
2631 strcpy (path, include_dirs[i]);
2633 strcat (path, filename);
2634 if (0 != (try = fopen (path, "r")))
2643 /* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
2644 newbuf = input_scrub_include_file (path, input_line_pointer);
2645 buffer_limit = input_scrub_next_buffer (&input_line_pointer);
2649 add_include_dir (path)
2654 if (include_dir_count == 0)
2656 include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
2657 include_dirs[0] = "."; /* Current dir */
2658 include_dir_count = 2;
2662 include_dir_count++;
2663 include_dirs = (char **) realloc (include_dirs,
2664 include_dir_count * sizeof (*include_dirs));
2667 include_dirs[include_dir_count - 1] = path; /* New one */
2670 if (i > include_dir_maxlen)
2671 include_dir_maxlen = i;
2672 } /* add_include_dir() */
2678 while (!is_end_of_line[*input_line_pointer])
2680 ++input_line_pointer;
2682 ++input_line_pointer;