1 /* as.h - global header file
2 Copyright (C) 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. */
20 /* static const char rcsid[] = "$Id$"; */
35 #define alloca __builtin_alloca
40 #define __LINE__ "unknown"
44 #define __FILE__ "unknown"
48 * I think this stuff is largely out of date. xoxorich.
50 * CAPITALISED names are #defined.
51 * "lowercaseH" is #defined if "lowercase.h" has been #include-d.
52 * "lowercaseT" is a typedef of "lowercase" objects.
53 * "lowercaseP" is type "pointer to object of type 'lowercase'".
54 * "lowercaseS" is typedef struct ... lowercaseS.
56 * #define DEBUG to enable all the "know" assertion tests.
57 * #define SUSPECT when debugging.
58 * #define COMMON as "extern" for all modules except one, where you #define
60 * If TEST is #defined, then we are testing a module: #define COMMON as "".
63 /* These #defines are for parameters of entire assembler. */
65 /* #define SUSPECT JF remove for speed testing */
66 /* These #includes are for type definitions etc. */
71 #define obstack_chunk_alloc ((void *(*) ()) xmalloc)
72 #define obstack_chunk_free ((void (*) ()) xfree)
74 #define BAD_CASE(value) \
76 as_fatal("Case value %d unexpected at line %d of file \"%s\"\n", \
77 value, __LINE__, __FILE__); \
81 /* These are assembler-wide concepts */
86 #define COMMON /* declare our COMMONs storage here. */
88 #define COMMON extern /* our commons live elswhere */
91 /* COMMON now defined */
92 #define DEBUG /* temporary */
96 #define know(p) assert(p) /* Verify our assumptions! */
98 #define know(p) /* know() checks are no-op.ed */
107 * Supplies sanitised buffers to read.c.
108 * Also understands printing line-number part of error messages.
112 /* subsegs.c Sub-segments. Also, segment(=expression type)s.*/
115 * This table describes the use of segments as EXPRESSION types.
117 * X_seg X_add_symbol X_subtract_symbol X_add_number
118 * SEG_ABSENT no (legal) expression
119 * SEG_PASS1 no (defined) "
120 * SEG_BIG * > 32 bits const.
126 * SEG_DIFFERENCE 0 * 0
129 * The blank fields MUST be 0, and are nugatory.
130 * The '0' fields MAY be 0. The '*' fields MAY NOT be 0.
132 * SEG_BIG: X_add_number is < 0 if the result is in
133 * generic_floating_point_number. The value is -'c' where c is the
134 * character that introduced the constant. e.g. "0f6.9" will have -'f'
135 * as a X_add_number value.
136 * X_add_number > 0 is a count of how many littlenums it took to
137 * represent a bignum.
139 * If segments of both symbols are known, they are the same segment.
140 * X_add_symbol != X_sub_symbol (then we just cancel them, => SEG_ABSOLUTE).
149 SEG_ABSENT
, /* Mythical Segment (absent): NO expression seen. */
150 SEG_PASS1
, /* Mythical Segment: Need another pass. */
151 SEG_GOOF
, /* Only happens if AS has a logic error. */
152 /* Invented so we don't crash printing */
153 /* error message involving weird segment. */
154 SEG_BIG
, /* Bigger than 32 bits constant. */
155 SEG_DIFFERENCE
, /* Mythical Segment: absolute difference. */
156 SEG_DEBUG
, /* Debug segment */
157 SEG_NTV
, /* Transfert vector preload segment */
158 SEG_PTV
, /* Transfert vector postload segment */
159 SEG_REGISTER
, /* Mythical: a register-valued expression */
162 #define SEG_MAXIMUM_ORDINAL (SEG_REGISTER)
166 COMMON subsegT now_subseg
;
167 /* What subseg we are accreting now? */
171 /* Segment our instructions emit to. */
172 /* Only OK values are SEG_TEXT or SEG_DATA. */
175 extern char *const seg_name
[];
176 extern int section_alignment
[];
181 typedef enum _relax_state
{
182 rs_fill
, /* Variable chars to be repeated fr_offset times. Fr_symbol
183 unused. Used with fr_offset == 0 for a constant length
186 rs_align
, /* Align: Fr_offset: power of 2. 1 variable char: fill
189 rs_org
, /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
192 rs_machine_dependent
,
194 #ifndef WORKING_DOT_WORD
195 rs_broken_word
, /* JF: gunpoint */
199 /* typedef unsigned char relax_substateT; */
200 /* JF this is more likely to leave the end of a struct frag on an align
201 boundry. Be very careful with this. */
202 typedef unsigned long relax_substateT
;
204 typedef unsigned long relax_addressT
;/* Enough bits for address. */
205 /* Still an integer type. */
211 * A code fragment (frag) is some known number of chars, followed by some
212 * unknown number of chars. Typically the unknown number of chars is an
213 * instruction address whose size is yet unknown. We always know the greatest
214 * possible size the unknown number of chars may become, and reserve that
215 * much room at the end of the frag.
216 * Once created, frags do not change address during assembly.
217 * We chain the frags in (a) forward-linked list(s). The object-file address
218 * of the 1st char of a frag is generally not known until after relax().
219 * Many things at assembly time describe an address by {object-file-address
220 * of a particular frag}+offset.
222 BUG: it may be smarter to have a single pointer off to various different
223 notes for different frag kinds. See how code pans
225 struct frag
/* a code fragment */
227 unsigned long fr_address
; /* Object file address. */
228 struct frag
*fr_next
; /* Chain forward; ascending address order. */
229 /* Rooted in frch_root. */
231 long fr_fix
; /* (Fixed) number of chars we know we have. */
233 long fr_var
; /* (Variable) number of chars after above. */
235 struct symbol
*fr_symbol
; /* For variable-length tail. */
236 long fr_offset
; /* For variable-length tail. */
237 char *fr_opcode
; /*->opcode low addr byte,for relax()ation*/
238 relax_stateT fr_type
; /* What state is my tail in? */
239 relax_substateT fr_subtype
;
240 /* These are needed only on the NS32K machines */
241 char fr_pcrel_adjust
;
243 char fr_literal
[1]; /* Chars begin here. */
244 /* One day we will compile fr_literal[0]. */
246 #define SIZEOF_STRUCT_FRAG \
247 ((int)zero_address_frag.fr_literal-(int)&zero_address_frag)
248 /* We want to say fr_literal[0] above. */
250 typedef struct frag fragS
;
252 COMMON fragS
* frag_now
; /* -> current frag we are building. */
253 /* This frag is incomplete. */
254 /* It is, however, included in frchain_now. */
255 /* Frag_now->fr_fix is bogus. Use: */
256 /* Virtual frag_now->fr_fix==obstack_next_free(&frags)-frag_now->fr_literal.*/
258 COMMON fragS zero_address_frag
; /* For foreign-segment symbol fixups. */
259 COMMON fragS bss_address_frag
; /* For local common (N_BSS segment) fixups. */
261 /* main program "as.c" (command arguments etc) */
264 flagseen
[128]; /* ['x'] TRUE if "-x" seen. */
267 out_file_name
; /* name of emitted object file */
269 COMMON
int need_pass_2
; /* TRUE if we need a second pass. */
272 char * poc_name
; /* assembler mnemonic, lower case, no '.' */
273 void (*poc_handler
)(); /* Do the work */
274 int poc_val
; /* Value to pass to handler */
277 #if defined(__STDC__) & !defined(NO_STDARG)
279 int had_errors(void);
280 int had_warnings(void);
281 void as_bad(const char *Format
, ...);
282 void as_fatal(const char *Format
, ...);
283 void as_tsktsk(const char *Format
, ...);
284 void as_warn(const char *Format
, ...);
295 #endif /* __STDC__ & !NO_STDARG */
299 char *app_push(void);
300 char *atof_ieee(char *str
, int what_kind
, LITTLENUM_TYPE
*words
);
301 char *decode_local_label_name(char *s
);
302 char *input_scrub_include_file(char *filename
, char *position
);
303 char *input_scrub_new_file(char *filename
);
304 char *input_scrub_next_buffer(char **bufp
);
305 char *strstr(const char *s
, const char *wanted
);
306 char *xmalloc(int size
);
307 char *xrealloc(char *ptr
, long n
);
308 int do_scrub_next_char(int (*get
)(), void (*unget
)());
309 int gen_to_words(LITTLENUM_TYPE
*words
, int precision
, long exponent_bits
);
311 int had_errors(void);
312 int had_warnings(void);
313 int ignore_input(void);
314 int scrub_from_file(void);
315 int scrub_from_file(void);
316 int scrub_from_string(void);
317 int seen_at_least_1_file(void);
318 void app_pop(char *arg
);
319 void as_howmuch(FILE *stream
);
320 void as_perror(char *gripe
, char *filename
);
322 void bump_line_counters(void);
323 void do_scrub_begin(void);
324 void input_scrub_begin(void);
325 void input_scrub_close(void);
326 void input_scrub_end(void);
327 void int_to_gen(long x
);
328 void new_logical_line(char *fname
, int line_number
);
329 void scrub_to_file(int ch
);
330 void scrub_to_string(int ch
);
331 void subseg_change(segT seg
, int subseg
);
332 void subseg_new(segT seg
, subsegT subseg
);
333 void subsegs_begin(void);
339 char *decode_local_label_name()
340 char *input_scrub_include_file();
341 char *input_scrub_new_file();
342 char *input_scrub_next_buffer();
346 int do_scrub_next_char();
352 int scrub_from_file();
353 int scrub_from_file();
354 int scrub_from_string();
355 int seen_at_least_1_file();
360 void bump_line_counters();
361 void do_scrub_begin();
362 void input_scrub_begin();
363 void input_scrub_close();
364 void input_scrub_end();
366 void new_logical_line();
367 void scrub_to_file();
368 void scrub_to_string();
369 void subseg_change();
371 void subsegs_begin();
373 #endif /* __STDC__ */
375 /* this one starts the chain of target dependant headers */
376 #include "targ-env.h"
378 /* these define types needed by the interfaces */
379 #include "struc-symbol.h"