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48 * I think this stuff is largely out of date.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 xmalloc
72 #define obstack_chunk_free 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 */
97 #define know(p) assert(p) /* Verify our assumptions! */
98 #endif /* not yet defined */
100 #define know(p) /* know() checks are no-op.ed */
109 * Supplies sanitised buffers to read.c.
110 * Also understands printing line-number part of error messages.
114 /* subsegs.c Sub-segments. Also, segment(=expression type)s.*/
117 * This table describes the use of segments as EXPRESSION types.
119 * X_seg X_add_symbol X_subtract_symbol X_add_number
120 * SEG_ABSENT no (legal) expression
121 * SEG_PASS1 no (defined) "
122 * SEG_BIG * > 32 bits const.
128 * SEG_DIFFERENCE 0 * 0
131 * The blank fields MUST be 0, and are nugatory.
132 * The '0' fields MAY be 0. The '*' fields MAY NOT be 0.
134 * SEG_BIG: X_add_number is < 0 if the result is in
135 * generic_floating_point_number. The value is -'c' where c is the
136 * character that introduced the constant. e.g. "0f6.9" will have -'f'
137 * as a X_add_number value.
138 * X_add_number > 0 is a count of how many littlenums it took to
139 * represent a bignum.
141 * If segments of both symbols are known, they are the same segment.
142 * X_add_symbol != X_sub_symbol (then we just cancel them, => SEG_ABSOLUTE).
147 #define N_SEGMENTS 10
148 #define SEG_NORMAL(x) ((x) >= SEG_E0 && (x) <= SEG_E9)
149 #define SEG_LIST SEG_E0,SEG_E1,SEG_E2,SEG_E3,SEG_E4,SEG_E5,SEG_E6,SEG_E7,SEG_E8,SEG_E9
150 #define SEG_DATA SEG_E1
151 #define SEG_TEXT SEG_E0
152 #define SEG_BSS SEG_E2
155 #define SEG_NORMAL(x) ((x) == SEG_TEXT || (x) == SEG_DATA || (x) == SEG_BSS)
156 #define SEG_LIST SEG_TEXT,SEG_DATA,SEG_BSS
163 SEG_ABSENT
, /* Mythical Segment (absent): NO expression seen. */
164 SEG_PASS1
, /* Mythical Segment: Need another pass. */
165 SEG_GOOF
, /* Only happens if AS has a logic error. */
166 /* Invented so we don't crash printing */
167 /* error message involving weird segment. */
168 SEG_BIG
, /* Bigger than 32 bits constant. */
169 SEG_DIFFERENCE
, /* Mythical Segment: absolute difference. */
170 SEG_DEBUG
, /* Debug segment */
171 SEG_NTV
, /* Transfert vector preload segment */
172 SEG_PTV
, /* Transfert vector postload segment */
173 SEG_REGISTER
, /* Mythical: a register-valued expression */
176 #define SEG_MAXIMUM_ORDINAL (SEG_REGISTER)
180 COMMON subsegT now_subseg
;
181 /* What subseg we are accreting now? */
185 /* Segment our instructions emit to. */
186 /* Only OK values are SEG_TEXT or SEG_DATA. */
189 extern char *const seg_name
[];
190 extern int section_alignment
[];
195 typedef enum _relax_state
{
196 rs_fill
, /* Variable chars to be repeated fr_offset times. Fr_symbol
197 unused. Used with fr_offset == 0 for a constant length
200 rs_align
, /* Align: Fr_offset: power of 2. 1 variable char: fill
203 rs_org
, /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
206 rs_machine_dependent
,
208 #ifndef WORKING_DOT_WORD
209 rs_broken_word
, /* JF: gunpoint */
213 /* typedef unsigned char relax_substateT; */
214 /* JF this is more likely to leave the end of a struct frag on an align
215 boundry. Be very careful with this. */
216 typedef unsigned long relax_substateT
;
218 typedef unsigned long relax_addressT
;/* Enough bits for address. */
219 /* Still an integer type. */
225 * A code fragment (frag) is some known number of chars, followed by some
226 * unknown number of chars. Typically the unknown number of chars is an
227 * instruction address whose size is yet unknown. We always know the greatest
228 * possible size the unknown number of chars may become, and reserve that
229 * much room at the end of the frag.
230 * Once created, frags do not change address during assembly.
231 * We chain the frags in (a) forward-linked list(s). The object-file address
232 * of the 1st char of a frag is generally not known until after relax().
233 * Many things at assembly time describe an address by {object-file-address
234 * of a particular frag}+offset.
236 BUG: it may be smarter to have a single pointer off to various different
237 notes for different frag kinds. See how code pans
239 struct frag
/* a code fragment */
241 unsigned long fr_address
; /* Object file address. */
242 struct frag
*fr_next
; /* Chain forward; ascending address order. */
243 /* Rooted in frch_root. */
245 long fr_fix
; /* (Fixed) number of chars we know we have. */
247 long fr_var
; /* (Variable) number of chars after above. */
249 struct symbol
*fr_symbol
; /* For variable-length tail. */
250 long fr_offset
; /* For variable-length tail. */
251 char *fr_opcode
; /*->opcode low addr byte,for relax()ation*/
252 relax_stateT fr_type
; /* What state is my tail in? */
253 relax_substateT fr_subtype
;
254 /* These are needed only on the NS32K machines */
255 char fr_pcrel_adjust
;
257 char fr_literal
[1]; /* Chars begin here. */
258 /* One day we will compile fr_literal[0]. */
260 #define SIZEOF_STRUCT_FRAG \
261 ((int)zero_address_frag.fr_literal-(int)&zero_address_frag)
262 /* We want to say fr_literal[0] above. */
264 typedef struct frag fragS
;
266 COMMON fragS
* frag_now
; /* -> current frag we are building. */
267 /* This frag is incomplete. */
268 /* It is, however, included in frchain_now. */
269 /* Frag_now->fr_fix is bogus. Use: */
270 /* Virtual frag_now->fr_fix==obstack_next_free(&frags)-frag_now->fr_literal.*/
272 COMMON fragS zero_address_frag
; /* For foreign-segment symbol fixups. */
273 COMMON fragS bss_address_frag
; /* For local common (N_BSS segment) fixups. */
275 /* main program "as.c" (command arguments etc) */
278 flagseen
[128]; /* ['x'] TRUE if "-x" seen. */
281 out_file_name
; /* name of emitted object file */
283 COMMON
int need_pass_2
; /* TRUE if we need a second pass. */
286 char * poc_name
; /* assembler mnemonic, lower case, no '.' */
287 void (*poc_handler
)(); /* Do the work */
288 int poc_val
; /* Value to pass to handler */
291 #if defined(__STDC__) & !defined(NO_STDARG)
293 int had_errors(void);
294 int had_warnings(void);
295 void as_bad(const char *Format
, ...);
296 void as_fatal(const char *Format
, ...);
297 void as_tsktsk(const char *Format
, ...);
298 void as_warn(const char *Format
, ...);
309 #endif /* __STDC__ & !NO_STDARG */
313 char *app_push(void);
314 char *atof_ieee(char *str
, int what_kind
, LITTLENUM_TYPE
*words
);
315 char *input_scrub_include_file(char *filename
, char *position
);
316 char *input_scrub_new_file(char *filename
);
317 char *input_scrub_next_buffer(char **bufp
);
318 char *strstr(const char *s
, const char *wanted
);
319 char *xmalloc(int size
);
320 char *xrealloc(char *ptr
, long n
);
321 int do_scrub_next_char(int (*get
)(), void (*unget
)());
322 int gen_to_words(LITTLENUM_TYPE
*words
, int precision
, long exponent_bits
);
324 int had_errors(void);
325 int had_warnings(void);
326 int ignore_input(void);
327 int scrub_from_file(void);
328 int scrub_from_file(void);
329 int scrub_from_string(void);
330 int seen_at_least_1_file(void);
331 void app_pop(char *arg
);
332 void as_howmuch(FILE *stream
);
333 void as_perror(char *gripe
, char *filename
);
335 void bump_line_counters(void);
336 void do_scrub_begin(void);
337 void input_scrub_begin(void);
338 void input_scrub_close(void);
339 void input_scrub_end(void);
340 void int_to_gen(long x
);
341 void new_logical_line(char *fname
, int line_number
);
342 void scrub_to_file(int ch
);
343 void scrub_to_string(int ch
);
344 void subseg_change(segT seg
, int subseg
);
345 void subseg_new(segT seg
, subsegT subseg
);
346 void subsegs_begin(void);
352 char *input_scrub_include_file();
353 char *input_scrub_new_file();
354 char *input_scrub_next_buffer();
358 int do_scrub_next_char();
364 int scrub_from_file();
365 int scrub_from_file();
366 int scrub_from_string();
367 int seen_at_least_1_file();
372 void bump_line_counters();
373 void do_scrub_begin();
374 void input_scrub_begin();
375 void input_scrub_close();
376 void input_scrub_end();
378 void new_logical_line();
379 void scrub_to_file();
380 void scrub_to_string();
381 void subseg_change();
383 void subsegs_begin();
385 #endif /* __STDC__ */
387 /* this one starts the chain of target dependant headers */
388 #include "targ-env.h"
390 /* these define types needed by the interfaces */
391 #include "struc-symbol.h"