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 1, 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48 * I think this stuff is largely out of date.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 */
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[];
183 rs_fill, /* Variable chars to be repeated fr_offset */
184 /* times. Fr_symbol unused. */
185 /* Used with fr_offset == 0 for a constant */
188 rs_align, /* Align: Fr_offset: power of 2. */
189 /* 1 variable char: fill character. */
190 rs_org, /* Org: Fr_offset, fr_symbol: address. */
191 /* 1 variable char: fill character. */
193 rs_machine_dependent,
194 #ifndef WORKING_DOT_WORD
195 rs_broken_word, /* JF: gunpoint */
200 /* typedef unsigned char relax_substateT; */
201 /* JF this is more likely to leave the end of a struct frag on an align
202 boundry. Be very careful with this. */
203 typedef unsigned long relax_substateT;
205 typedef unsigned long relax_addressT;/* Enough bits for address. */
206 /* Still an integer type. */
212 * A code fragment (frag) is some known number of chars, followed by some
213 * unknown number of chars. Typically the unknown number of chars is an
214 * instruction address whose size is yet unknown. We always know the greatest
215 * possible size the unknown number of chars may become, and reserve that
216 * much room at the end of the frag.
217 * Once created, frags do not change address during assembly.
218 * We chain the frags in (a) forward-linked list(s). The object-file address
219 * of the 1st char of a frag is generally not known until after relax().
220 * Many things at assembly time describe an address by {object-file-address
221 * of a particular frag}+offset.
223 BUG: it may be smarter to have a single pointer off to various different
224 notes for different frag kinds. See how code pans
226 struct frag /* a code fragment */
228 unsigned long fr_address; /* Object file address. */
229 struct frag *fr_next; /* Chain forward; ascending address order. */
230 /* Rooted in frch_root. */
232 long fr_fix; /* (Fixed) number of chars we know we have. */
234 long fr_var; /* (Variable) number of chars after above. */
236 struct symbol *fr_symbol; /* For variable-length tail. */
237 long fr_offset; /* For variable-length tail. */
238 char *fr_opcode; /*->opcode low addr byte,for relax()ation*/
239 relax_stateT fr_type; /* What state is my tail in? */
240 relax_substateT fr_subtype;
241 /* These are needed only on the NS32K machines */
242 char fr_pcrel_adjust;
244 char fr_literal [1]; /* Chars begin here. */
245 /* One day we will compile fr_literal[0]. */
247 #define SIZEOF_STRUCT_FRAG \
248 ((int)zero_address_frag.fr_literal-(int)&zero_address_frag)
249 /* We want to say fr_literal[0] above. */
251 typedef struct frag fragS;
253 COMMON fragS * frag_now; /* -> current frag we are building. */
254 /* This frag is incomplete. */
255 /* It is, however, included in frchain_now. */
256 /* Frag_now->fr_fix is bogus. Use: */
257 /* Virtual frag_now->fr_fix==obstack_next_free(&frags)-frag_now->fr_literal.*/
259 COMMON fragS zero_address_frag; /* For foreign-segment symbol fixups. */
260 COMMON fragS bss_address_frag; /* For local common (N_BSS segment) fixups. */
262 /* main program "as.c" (command arguments etc) */
265 flagseen[128]; /* ['x'] TRUE if "-x" seen. */
268 out_file_name; /* name of emitted object file */
270 COMMON int need_pass_2; /* TRUE if we need a second pass. */
273 char * poc_name; /* assembler mnemonic, lower case, no '.' */
274 void (*poc_handler)(); /* Do the work */
275 int poc_val; /* Value to pass to handler */
278 #if defined(__STDC__) & !defined(NO_STDARG)
280 int had_errors(void);
281 int had_warnings(void);
282 void as_bad(const char *Format, ...);
283 void as_fatal(const char *Format, ...);
284 void as_tsktsk(const char *Format, ...);
285 void as_warn(const char *Format, ...);
296 #endif /* __STDC__ & !NO_STDARG */
300 char *app_push(void);
301 char *atof_ieee(char *str, int what_kind, LITTLENUM_TYPE *words);
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 *input_scrub_include_file();
340 char *input_scrub_new_file();
341 char *input_scrub_next_buffer();
345 int do_scrub_next_char();
351 int scrub_from_file();
352 int scrub_from_file();
353 int scrub_from_string();
354 int seen_at_least_1_file();
359 void bump_line_counters();
360 void do_scrub_begin();
361 void input_scrub_begin();
362 void input_scrub_close();
363 void input_scrub_end();
365 void new_logical_line();
366 void scrub_to_file();
367 void scrub_to_string();
368 void subseg_change();
370 void subsegs_begin();
372 #endif /* __STDC__ */
374 /* this one starts the chain of target dependant headers */
375 #include "targ-env.h"
377 /* these define types needed by the interfaces */
378 #include "struc-symbol.h"