gas/as.h

   1 /* as.h - global header file
   2    Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GAS, the GNU Assembler.
   5
   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)
   9 any later version.
  10
  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.
  15
  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.  */
  19
  20 /* static const char rcsid[] = "$Id$"; */
  21
  22 #define GAS 1
  23
  24 #include "host.h"
  25 #include "flonum.h"
  26
  27 #ifndef __STDC__
  28 #define volatile        /**/
  29 #ifndef const
  30 #define const           /**/
  31 #endif /* const */
  32 #endif /* __STDC__ */
  33
  34 #ifdef __GNUC__
  35 #define alloca __builtin_alloca
  36 #define register
  37 #endif /* __GNUC__ */
  38
  39 #ifndef __LINE__
  40 #define __LINE__ "unknown"
  41 #endif /* __LINE__ */
  42
  43 #ifndef __FILE__
  44 #define __FILE__ "unknown"
  45 #endif /* __FILE__ */
  46
  47 /*
  48  * I think this stuff is largely out of date.  xoxorich.
  49  *
  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.
  55  *
  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
  59  *      COMMON as "".
  60  * If TEST is #defined, then we are testing a module: #define COMMON as "".
  61  */
  62
  63 /* These #defines are for parameters of entire assembler. */
  64
  65 /* #define SUSPECT JF remove for speed testing */
  66 /* These #includes are for type definitions etc. */
  67
  68 #include <stdio.h>
  69 #include <assert.h>
  70
  71 #define obstack_chunk_alloc     xmalloc
  72 #define obstack_chunk_free      xfree
  73
  74 #define BAD_CASE(value)                                                 \
  75 {                                                                       \
  76   as_fatal("Case value %d unexpected at line %d of file \"%s\"\n",      \
  77            value, __LINE__, __FILE__);                                  \
  78 }
  79
  80 \f
  81 /* These are assembler-wide concepts */
  82
  83
  84 #ifndef COMMON
  85 #ifdef TEST
  86 #define COMMON                  /* declare our COMMONs storage here. */
  87 #else
  88 #define COMMON extern           /* our commons live elswhere */
  89 #endif
  90 #endif
  91                                 /* COMMON now defined */
  92 #define DEBUG /* temporary */
  93
  94 #ifdef DEBUG
  95 #undef NDEBUG
  96 #define know(p) assert(p)       /* Verify our assumptions! */
  97 #else
  98 #define know(p)                 /* know() checks are no-op.ed */
  99 #endif
 100
 101
 102 #define xfree free
 103 \f
 104 /* input_scrub.c */
 105
 106 /*
 107  * Supplies sanitised buffers to read.c.
 108  * Also understands printing line-number part of error messages.
 109  */
 110
 111 \f
 112 /* subsegs.c     Sub-segments. Also, segment(=expression type)s.*/
 113
 114 /*
 115  * This table describes the use of segments as EXPRESSION types.
 116  *
 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.
 121  * SEG_ABSOLUTE                                 0
 122  * SEG_DATA             *                       0
 123  * SEG_TEXT             *                       0
 124  * SEG_BSS              *                       0
 125  * SEG_UNKNOWN          *                       0
 126  * SEG_DIFFERENCE       0               *       0
 127  * SEG_REGISTER                                 *
 128  *
 129  * The blank fields MUST be 0, and are nugatory.
 130  * The '0' fields MAY be 0. The '*' fields MAY NOT be 0.
 131  *
 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.
 138  * SEG_DIFFERENCE:
 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).
 141  */
 142
 143 typedef enum {
 144         SEG_ABSOLUTE = 0,
 145         SEG_TEXT,
 146         SEG_DATA,
 147         SEG_BSS,
 148         SEG_UNKNOWN,
 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 */
 160 } segT;
 161
 162 #define SEG_MAXIMUM_ORDINAL (SEG_REGISTER)
 163
 164 typedef int subsegT;
 165
 166 COMMON subsegT                  now_subseg;
 167                                 /* What subseg we are accreting now? */
 168
 169
 170 COMMON segT                     now_seg;
 171                                 /* Segment our instructions emit to. */
 172                                 /* Only OK values are SEG_TEXT or SEG_DATA. */
 173
 174
 175 extern char *const seg_name[];
 176 extern int section_alignment[];
 177
 178
 179 /* relax() */
 180
 181 typedef enum
 182 {
 183         rs_fill,                /* Variable chars to be repeated fr_offset */
 184                                 /* times. Fr_symbol unused. */
 185                                 /* Used with fr_offset == 0 for a constant */
 186                                 /* length frag. */
 187
 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. */
 192
 193         rs_machine_dependent,
 194 #ifndef WORKING_DOT_WORD
 195         rs_broken_word,         /* JF: gunpoint */
 196 #endif
 197 }
 198 relax_stateT;
 199
 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;
 204
 205 typedef unsigned long relax_addressT;/* Enough bits for address. */
 206                                 /* Still an integer type. */
 207
 208 \f
 209 /* frags.c */
 210
 211 /*
 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.
 222
 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
 225  */
 226 struct frag                     /* a code fragment */
 227 {
 228         unsigned long fr_address; /* Object file address. */
 229         struct frag *fr_next;   /* Chain forward; ascending address order. */
 230                                 /* Rooted in frch_root. */
 231
 232         long fr_fix;    /* (Fixed) number of chars we know we have. */
 233                                 /* May be 0. */
 234         long fr_var;    /* (Variable) number of chars after above. */
 235                                 /* May be 0. */
 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;
 243         char    fr_bsr;
 244         char    fr_literal [1]; /* Chars begin here. */
 245                                 /* One day we will compile fr_literal[0]. */
 246 };
 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. */
 250
 251 typedef struct frag fragS;
 252
 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.*/
 258
 259 COMMON fragS zero_address_frag; /* For foreign-segment symbol fixups. */
 260 COMMON fragS  bss_address_frag; /* For local common (N_BSS segment) fixups. */
 261
 262 /* main program "as.c" (command arguments etc) */
 263
 264 COMMON char
 265 flagseen[128];                  /* ['x'] TRUE if "-x" seen. */
 266
 267 COMMON char *
 268 out_file_name;                  /* name of emitted object file */
 269
 270 COMMON int      need_pass_2;    /* TRUE if we need a second pass. */
 271
 272 typedef struct {
 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 */
 276 } pseudo_typeS;
 277
 278 #if defined(__STDC__) & !defined(NO_STDARG)
 279
 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, ...);
 286
 287 #else
 288
 289 int had_errors();
 290 int had_warnings();
 291 void as_bad();
 292 void as_fatal();
 293 void as_tsktsk();
 294 void as_warn();
 295
 296 #endif /* __STDC__ & !NO_STDARG */
 297
 298 #ifdef __STDC__
 299
 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);
 310 int had_err(void);
 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);
 321 void as_where(void);
 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);
 334
 335 #else /* __STDC__ */
 336
 337 char *app_push();
 338 char *atof_ieee();
 339 char *input_scrub_include_file();
 340 char *input_scrub_new_file();
 341 char *input_scrub_next_buffer();
 342 char *strstr();
 343 char *xmalloc();
 344 char *xrealloc();
 345 int do_scrub_next_char();
 346 int gen_to_words();
 347 int had_err();
 348 int had_errors();
 349 int had_warnings();
 350 int ignore_input();
 351 int scrub_from_file();
 352 int scrub_from_file();
 353 int scrub_from_string();
 354 int seen_at_least_1_file();
 355 void app_pop();
 356 void as_howmuch();
 357 void as_perror();
 358 void as_where();
 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();
 364 void int_to_gen();
 365 void new_logical_line();
 366 void scrub_to_file();
 367 void scrub_to_string();
 368 void subseg_change();
 369 void subseg_new();
 370 void subsegs_begin();
 371
 372 #endif /* __STDC__ */
 373
 374  /* this one starts the chain of target dependant headers */
 375 #include "targ-env.h"
 376
 377  /* these define types needed by the interfaces */
 378 #include "struc-symbol.h"
 379 #include "reloc.h"
 380 #include "write.h"
 381 #include "expr.h"
 382 #include "frags.h"
 383 #include "hash.h"
 384 #include "read.h"
 385 #include "symbols.h"
 386
 387 #include "tc.h"
 388 #include "obj.h"
 389
 390 /*
 391  * Local Variables:
 392  * comment-column: 0
 393  * fill-column: 131
 394  * End:
 395  */
 396
 397 /* end: as.h */