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48 * I think this stuff is largely out of date.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
152 #define SEG_NORMAL(x) ((x) == SEG_TEXT || (x) == SEG_DATA || (x) == SEG_BSS)
153 #define SEG_LIST SEG_TEXT,SEG_DATA,SEG_BSS
160 SEG_ABSENT, /* Mythical Segment (absent): NO expression seen. */
161 SEG_PASS1, /* Mythical Segment: Need another pass. */
162 SEG_GOOF, /* Only happens if AS has a logic error. */
163 /* Invented so we don't crash printing */
164 /* error message involving weird segment. */
165 SEG_BIG, /* Bigger than 32 bits constant. */
166 SEG_DIFFERENCE, /* Mythical Segment: absolute difference. */
167 SEG_DEBUG, /* Debug segment */
168 SEG_NTV, /* Transfert vector preload segment */
169 SEG_PTV, /* Transfert vector postload segment */
170 SEG_REGISTER, /* Mythical: a register-valued expression */
173 #define SEG_MAXIMUM_ORDINAL (SEG_REGISTER)
177 COMMON subsegT now_subseg;
178 /* What subseg we are accreting now? */
182 /* Segment our instructions emit to. */
183 /* Only OK values are SEG_TEXT or SEG_DATA. */
186 extern char *const seg_name[];
187 extern int section_alignment[];
192 typedef enum _relax_state {
193 rs_fill, /* Variable chars to be repeated fr_offset times. Fr_symbol
194 unused. Used with fr_offset == 0 for a constant length
197 rs_align, /* Align: Fr_offset: power of 2. 1 variable char: fill
200 rs_org, /* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
203 rs_machine_dependent,
205 #ifndef WORKING_DOT_WORD
206 rs_broken_word, /* JF: gunpoint */
210 /* typedef unsigned char relax_substateT; */
211 /* JF this is more likely to leave the end of a struct frag on an align
212 boundry. Be very careful with this. */
213 typedef unsigned long relax_substateT;
215 typedef unsigned long relax_addressT;/* Enough bits for address. */
216 /* Still an integer type. */
222 * A code fragment (frag) is some known number of chars, followed by some
223 * unknown number of chars. Typically the unknown number of chars is an
224 * instruction address whose size is yet unknown. We always know the greatest
225 * possible size the unknown number of chars may become, and reserve that
226 * much room at the end of the frag.
227 * Once created, frags do not change address during assembly.
228 * We chain the frags in (a) forward-linked list(s). The object-file address
229 * of the 1st char of a frag is generally not known until after relax().
230 * Many things at assembly time describe an address by {object-file-address
231 * of a particular frag}+offset.
233 BUG: it may be smarter to have a single pointer off to various different
234 notes for different frag kinds. See how code pans
236 struct frag /* a code fragment */
238 unsigned long fr_address; /* Object file address. */
239 struct frag *fr_next; /* Chain forward; ascending address order. */
240 /* Rooted in frch_root. */
242 long fr_fix; /* (Fixed) number of chars we know we have. */
244 long fr_var; /* (Variable) number of chars after above. */
246 struct symbol *fr_symbol; /* For variable-length tail. */
247 long fr_offset; /* For variable-length tail. */
248 char *fr_opcode; /*->opcode low addr byte,for relax()ation*/
249 relax_stateT fr_type; /* What state is my tail in? */
250 relax_substateT fr_subtype;
251 /* These are needed only on the NS32K machines */
252 char fr_pcrel_adjust;
254 char fr_literal [1]; /* Chars begin here. */
255 /* One day we will compile fr_literal[0]. */
257 #define SIZEOF_STRUCT_FRAG \
258 ((int)zero_address_frag.fr_literal-(int)&zero_address_frag)
259 /* We want to say fr_literal[0] above. */
261 typedef struct frag fragS;
263 COMMON fragS * frag_now; /* -> current frag we are building. */
264 /* This frag is incomplete. */
265 /* It is, however, included in frchain_now. */
266 /* Frag_now->fr_fix is bogus. Use: */
267 /* Virtual frag_now->fr_fix==obstack_next_free(&frags)-frag_now->fr_literal.*/
269 COMMON fragS zero_address_frag; /* For foreign-segment symbol fixups. */
270 COMMON fragS bss_address_frag; /* For local common (N_BSS segment) fixups. */
272 /* main program "as.c" (command arguments etc) */
275 flagseen[128]; /* ['x'] TRUE if "-x" seen. */
278 out_file_name; /* name of emitted object file */
280 COMMON int need_pass_2; /* TRUE if we need a second pass. */
283 char * poc_name; /* assembler mnemonic, lower case, no '.' */
284 void (*poc_handler)(); /* Do the work */
285 int poc_val; /* Value to pass to handler */
288 #if defined(__STDC__) & !defined(NO_STDARG)
290 int had_errors(void);
291 int had_warnings(void);
292 void as_bad(const char *Format, ...);
293 void as_fatal(const char *Format, ...);
294 void as_tsktsk(const char *Format, ...);
295 void as_warn(const char *Format, ...);
306 #endif /* __STDC__ & !NO_STDARG */
310 char *app_push(void);
311 char *atof_ieee(char *str, int what_kind, LITTLENUM_TYPE *words);
312 char *input_scrub_include_file(char *filename, char *position);
313 char *input_scrub_new_file(char *filename);
314 char *input_scrub_next_buffer(char **bufp);
315 char *strstr(const char *s, const char *wanted);
316 char *xmalloc(int size);
317 char *xrealloc(char *ptr, long n);
318 int do_scrub_next_char(int (*get)(), void (*unget)());
319 int gen_to_words(LITTLENUM_TYPE *words, int precision, long exponent_bits);
321 int had_errors(void);
322 int had_warnings(void);
323 int ignore_input(void);
324 int scrub_from_file(void);
325 int scrub_from_file(void);
326 int scrub_from_string(void);
327 int seen_at_least_1_file(void);
328 void app_pop(char *arg);
329 void as_howmuch(FILE *stream);
330 void as_perror(char *gripe, char *filename);
332 void bump_line_counters(void);
333 void do_scrub_begin(void);
334 void input_scrub_begin(void);
335 void input_scrub_close(void);
336 void input_scrub_end(void);
337 void int_to_gen(long x);
338 void new_logical_line(char *fname, int line_number);
339 void scrub_to_file(int ch);
340 void scrub_to_string(int ch);
341 void subseg_change(segT seg, int subseg);
342 void subseg_new(segT seg, subsegT subseg);
343 void subsegs_begin(void);
349 char *input_scrub_include_file();
350 char *input_scrub_new_file();
351 char *input_scrub_next_buffer();
355 int do_scrub_next_char();
361 int scrub_from_file();
362 int scrub_from_file();
363 int scrub_from_string();
364 int seen_at_least_1_file();
369 void bump_line_counters();
370 void do_scrub_begin();
371 void input_scrub_begin();
372 void input_scrub_close();
373 void input_scrub_end();
375 void new_logical_line();
376 void scrub_to_file();
377 void scrub_to_string();
378 void subseg_change();
380 void subsegs_begin();
382 #endif /* __STDC__ */
384 /* this one starts the chain of target dependant headers */
385 #include "targ-env.h"
387 /* these define types needed by the interfaces */
388 #include "struc-symbol.h"