nasmlib.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2016 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * nasmlib.h    header file for nasmlib.c
  36  */
  37
  38 #ifndef NASM_NASMLIB_H
  39 #define NASM_NASMLIB_H
  40
  41 #include "compiler.h"
  42
  43 #include <inttypes.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46 #ifdef HAVE_STRINGS_H
  47 #include <strings.h>
  48 #endif
  49
  50 /*
  51  * tolower table -- avoids a function call on some platforms.
  52  * NOTE: unlike the tolower() function in ctype, EOF is *NOT*
  53  * a permitted value, for obvious reasons.
  54  */
  55 void tolower_init(void);
  56 extern unsigned char nasm_tolower_tab[256];
  57 #define nasm_tolower(x) nasm_tolower_tab[(unsigned char)(x)]
  58
  59 /* Wrappers around <ctype.h> functions */
  60 /* These are only valid for values that cannot include EOF */
  61 #define nasm_isspace(x)  isspace((unsigned char)(x))
  62 #define nasm_isalpha(x)  isalpha((unsigned char)(x))
  63 #define nasm_isdigit(x)  isdigit((unsigned char)(x))
  64 #define nasm_isalnum(x)  isalnum((unsigned char)(x))
  65 #define nasm_isxdigit(x) isxdigit((unsigned char)(x))
  66
  67 /*
  68  * -------------------------
  69  * Error reporting functions
  70  * -------------------------
  71  */
  72
  73 /*
  74  * An error reporting function should look like this.
  75  */
  76 typedef void (*efunc) (int severity, const char *fmt, ...);
  77 typedef void (*vefunc) (int severity, const char *fmt, va_list ap);
  78 void printf_func(2, 3) nasm_error(int severity, const char *fmt, ...);
  79 void nasm_set_verror(vefunc);
  80 no_return printf_func(2, 3) nasm_panic(int flags, const char *fmt, ...);
  81 no_return nasm_panic_from_macro(const char *file, int line);
  82 #define panic() nasm_panic_from_macro(__FILE__, __LINE__);
  83
  84 /*
  85  * These are the error severity codes which get passed as the first
  86  * argument to an efunc.
  87  */
  88
  89 #define ERR_DEBUG       0x00000008      /* put out debugging message */
  90 #define ERR_WARNING     0x00000000      /* warn only: no further action */
  91 #define ERR_NONFATAL    0x00000001      /* terminate assembly after phase */
  92 #define ERR_FATAL       0x00000002      /* instantly fatal: exit with error */
  93 #define ERR_PANIC       0x00000003      /* internal error: panic instantly
  94                                          * and dump core for reference */
  95 #define ERR_MASK        0x0000000F      /* mask off the above codes */
  96 #define ERR_NOFILE      0x00000010      /* don't give source file name/line */
  97 #define ERR_USAGE       0x00000020      /* print a usage message */
  98 #define ERR_PASS1       0x00000040      /* only print this error on pass one */
  99 #define ERR_PASS2       0x00000080
 100 #define ERR_NO_SEVERITY 0x00000100      /* suppress printing severity */
 101
 102 /*
 103  * These codes define specific types of suppressible warning.
 104  */
 105
 106 #define ERR_WARN_MASK   0xFFFFF000      /* the mask for this feature */
 107 #define ERR_WARN_SHR    12              /* how far to shift right */
 108
 109 #define WARN(x)         ((x) << ERR_WARN_SHR)
 110 #define WARN_IDX(x)     (((x) & ERR_WARN_MASK) >> ERR_WARN_SHR)
 111
 112 #define ERR_WARN_TERM           WARN( 0) /* treat warnings as errors */
 113 #define ERR_WARN_MNP            WARN( 1) /* macro-num-parameters warning */
 114 #define ERR_WARN_MSR            WARN( 2) /* macro self-reference */
 115 #define ERR_WARN_MDP            WARN( 3) /* macro default parameters check */
 116 #define ERR_WARN_OL             WARN( 4) /* orphan label (no colon, and
 117                                           * alone on line) */
 118 #define ERR_WARN_NOV            WARN( 5) /* numeric overflow */
 119 #define ERR_WARN_GNUELF         WARN( 6) /* using GNU ELF extensions */
 120 #define ERR_WARN_FL_OVERFLOW    WARN( 7) /* FP overflow */
 121 #define ERR_WARN_FL_DENORM      WARN( 8) /* FP denormal */
 122 #define ERR_WARN_FL_UNDERFLOW   WARN( 9) /* FP underflow */
 123 #define ERR_WARN_FL_TOOLONG     WARN(10) /* FP too many digits */
 124 #define ERR_WARN_USER           WARN(11) /* %warning directives */
 125 #define ERR_WARN_LOCK           WARN(12) /* bad LOCK prefixes */
 126 #define ERR_WARN_HLE            WARN(13) /* bad HLE prefixes */
 127 #define ERR_WARN_BND            WARN(14) /* bad BND prefixes */
 128 #define ERR_WARN_ZEXTRELOC      WARN(15) /* relocation zero-extended */
 129 #define ERR_WARN_MAX            15       /* the highest numbered one */
 130
 131 /*
 132  * Wrappers around malloc, realloc and free. nasm_malloc will
 133  * fatal-error and die rather than return NULL; nasm_realloc will
 134  * do likewise, and will also guarantee to work right on being
 135  * passed a NULL pointer; nasm_free will do nothing if it is passed
 136  * a NULL pointer.
 137  */
 138 void *nasm_malloc(size_t);
 139 void *nasm_zalloc(size_t);
 140 void *nasm_realloc(void *, size_t);
 141 void nasm_free(void *);
 142 char *nasm_strdup(const char *);
 143 char *nasm_strndup(const char *, size_t);
 144
 145 /*
 146  * Wrapper around fwrite() which fatal-errors on output failure.
 147  */
 148 void nasm_write(const void *, size_t, FILE *);
 149
 150 /*
 151  * NASM assert failure
 152  */
 153 no_return nasm_assert_failed(const char *, int, const char *);
 154 #define nasm_assert(x)                                          \
 155     do {                                                        \
 156         if (unlikely(!(x)))                                     \
 157             nasm_assert_failed(__FILE__,__LINE__,#x);           \
 158     } while (0)
 159
 160 /*
 161  * NASM failure at build time if x != 0
 162  */
 163 #define nasm_build_assert(x) (void)(sizeof(char[1-2*!!(x)]))
 164
 165 /*
 166  * ANSI doesn't guarantee the presence of `stricmp' or
 167  * `strcasecmp'.
 168  */
 169 #if defined(HAVE_STRCASECMP)
 170 #define nasm_stricmp strcasecmp
 171 #elif defined(HAVE_STRICMP)
 172 #define nasm_stricmp stricmp
 173 #else
 174 int nasm_stricmp(const char *, const char *);
 175 #endif
 176
 177 #if defined(HAVE_STRNCASECMP)
 178 #define nasm_strnicmp strncasecmp
 179 #elif defined(HAVE_STRNICMP)
 180 #define nasm_strnicmp strnicmp
 181 #else
 182 int nasm_strnicmp(const char *, const char *, size_t);
 183 #endif
 184
 185 int nasm_memicmp(const char *, const char *, size_t);
 186
 187 #if defined(HAVE_STRSEP)
 188 #define nasm_strsep strsep
 189 #else
 190 char *nasm_strsep(char **stringp, const char *delim);
 191 #endif
 192
 193 /* This returns the numeric value of a given 'digit'. */
 194 #define numvalue(c)         ((c) >= 'a' ? (c) - 'a' + 10 : (c) >= 'A' ? (c) - 'A' + 10 : (c) - '0')
 195
 196 /*
 197  * Convert a string into a number, using NASM number rules. Sets
 198  * `*error' to true if an error occurs, and false otherwise.
 199  */
 200 int64_t readnum(char *str, bool *error);
 201
 202 /*
 203  * Convert a character constant into a number. Sets
 204  * `*warn' to true if an overflow occurs, and false otherwise.
 205  * str points to and length covers the middle of the string,
 206  * without the quotes.
 207  */
 208 int64_t readstrnum(char *str, int length, bool *warn);
 209
 210 /*
 211  * seg_init: Initialise the segment-number allocator.
 212  * seg_alloc: allocate a hitherto unused segment number.
 213  */
 214 void seg_init(void);
 215 int32_t seg_alloc(void);
 216
 217 /*
 218  * many output formats will be able to make use of this: a standard
 219  * function to add an extension to the name of the input file
 220  */
 221 void standard_extension(char *inname, char *outname, char *extension);
 222
 223 /*
 224  * Utility macros...
 225  *
 226  * This is a useful #define which I keep meaning to use more often:
 227  * the number of elements of a statically defined array.
 228  */
 229 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 230
 231 /*
 232  * List handling
 233  *
 234  *  list_for_each - regular iterator over list
 235  *  list_for_each_safe - the same but safe against list items removal
 236  *  list_last - find the last element in a list
 237  */
 238 #define list_for_each(pos, head)                        \
 239     for (pos = head; pos; pos = pos->next)
 240 #define list_for_each_safe(pos, n, head)                \
 241     for (pos = head, n = (pos ? pos->next : NULL); pos; \
 242         pos = n, n = (n ? n->next : NULL))
 243 #define list_last(pos, head)                            \
 244     for (pos = head; pos && pos->next; pos = pos->next) \
 245         ;
 246 #define list_reverse(head, prev, next)                  \
 247     do {                                                \
 248         if (!head || !head->next)                       \
 249             break;                                      \
 250         prev = NULL;                                    \
 251         while (head) {                                  \
 252             next = head->next;                          \
 253             head->next = prev;                          \
 254             prev = head;                                \
 255             head = next;                                \
 256         }                                               \
 257         head = prev;                                    \
 258     } while (0)
 259
 260 /*
 261  * Power of 2 align helpers
 262  */
 263 #undef ALIGN_MASK               /* Some BSD flavors define these in system headers */
 264 #undef ALIGN
 265 #define ALIGN_MASK(v, mask)     (((v) + (mask)) & ~(mask))
 266 #define ALIGN(v, a)             ALIGN_MASK(v, (a) - 1)
 267 #define IS_ALIGNED(v, a)        (((v) & ((a) - 1)) == 0)
 268
 269 /*
 270  * some handy macros that will probably be of use in more than one
 271  * output format: convert integers into little-endian byte packed
 272  * format in memory
 273  */
 274
 275 #if X86_MEMORY
 276
 277 #define WRITECHAR(p,v)                          \
 278     do {                                        \
 279         *(uint8_t *)(p) = (v);                  \
 280         (p) += 1;                               \
 281     } while (0)
 282
 283 #define WRITESHORT(p,v)                         \
 284     do {                                        \
 285         *(uint16_t *)(p) = (v);                 \
 286         (p) += 2;                               \
 287     } while (0)
 288
 289 #define WRITELONG(p,v)                          \
 290     do {                                        \
 291         *(uint32_t *)(p) = (v);                 \
 292         (p) += 4;                               \
 293     } while (0)
 294
 295 #define WRITEDLONG(p,v)                         \
 296     do {                                        \
 297         *(uint64_t *)(p) = (v);                 \
 298         (p) += 8;                               \
 299     } while (0)
 300
 301 #define WRITEADDR(p,v,s)                        \
 302     do {                                        \
 303         uint64_t _wa_v = (v);                   \
 304         memcpy((p), &_wa_v, (s));               \
 305         (p) += (s);                             \
 306     } while (0)
 307
 308 #else /* !X86_MEMORY */
 309
 310 #define WRITECHAR(p,v)                          \
 311     do {                                        \
 312         uint8_t *_wc_p = (uint8_t *)(p);        \
 313         uint8_t _wc_v = (v);                    \
 314         _wc_p[0] = _wc_v;                       \
 315         (p) = (void *)(_wc_p + 1);              \
 316     } while (0)
 317
 318 #define WRITESHORT(p,v)                         \
 319     do {                                        \
 320         uint8_t *_ws_p = (uint8_t *)(p);        \
 321         uint16_t _ws_v = (v);                   \
 322         _ws_p[0] = _ws_v;                       \
 323         _ws_p[1] = _ws_v >> 8;                  \
 324         (p) = (void *)(_ws_p + 2);              \
 325     } while (0)
 326
 327 #define WRITELONG(p,v)                          \
 328     do {                                        \
 329         uint8_t *_wl_p = (uint8_t *)(p);        \
 330         uint32_t _wl_v = (v);                   \
 331         _wl_p[0] = _wl_v;                       \
 332         _wl_p[1] = _wl_v >> 8;                  \
 333         _wl_p[2] = _wl_v >> 16;                 \
 334         _wl_p[3] = _wl_v >> 24;                 \
 335         (p) = (void *)(_wl_p + 4);              \
 336     } while (0)
 337
 338 #define WRITEDLONG(p,v)                         \
 339     do {                                        \
 340         uint8_t *_wq_p = (uint8_t *)(p);        \
 341         uint64_t _wq_v = (v);                   \
 342         _wq_p[0] = _wq_v;                       \
 343         _wq_p[1] = _wq_v >> 8;                  \
 344         _wq_p[2] = _wq_v >> 16;                 \
 345         _wq_p[3] = _wq_v >> 24;                 \
 346         _wq_p[4] = _wq_v >> 32;                 \
 347         _wq_p[5] = _wq_v >> 40;                 \
 348         _wq_p[6] = _wq_v >> 48;                 \
 349         _wq_p[7] = _wq_v >> 56;                 \
 350         (p) = (void *)(_wq_p + 8);              \
 351     } while (0)
 352
 353 #define WRITEADDR(p,v,s)                        \
 354     do {                                        \
 355         int _wa_s = (s);                        \
 356         uint64_t _wa_v = (v);                   \
 357         while (_wa_s--) {                       \
 358             WRITECHAR(p,_wa_v);                 \
 359             _wa_v >>= 8;                        \
 360         }                                       \
 361     } while(0)
 362
 363 #endif
 364
 365 /*
 366  * and routines to do the same thing to a file
 367  */
 368 #define fwriteint8_t(d,f) putc(d,f)
 369 void fwriteint16_t(uint16_t data, FILE * fp);
 370 void fwriteint32_t(uint32_t data, FILE * fp);
 371 void fwriteint64_t(uint64_t data, FILE * fp);
 372 void fwriteaddr(uint64_t data, int size, FILE * fp);
 373
 374 /*
 375  * Binary search routine. Returns index into `array' of an entry
 376  * matching `string', or <0 if no match. `array' is taken to
 377  * contain `size' elements.
 378  *
 379  * bsi() is case sensitive, bsii() is case insensitive.
 380  */
 381 int bsi(const char *string, const char **array, int size);
 382 int bsii(const char *string, const char **array, int size);
 383
 384 char *src_set_fname(char *newname);
 385 int32_t src_set_linnum(int32_t newline);
 386 int32_t src_get_linnum(void);
 387 /*
 388  * src_get may be used if you simply want to know the source file and line.
 389  * It is also used if you maintain private status about the source location
 390  * It return 0 if the information was the same as the last time you
 391  * checked, -1 if the name changed and (new-old) if just the line changed.
 392  */
 393 int src_get(int32_t *xline, char **xname);
 394
 395 char *nasm_strcat(const char *one, const char *two);
 396
 397 char *nasm_skip_spaces(const char *p);
 398 char *nasm_skip_word(const char *p);
 399 char *nasm_zap_spaces_fwd(char *p);
 400 char *nasm_zap_spaces_rev(char *p);
 401 char *nasm_trim_spaces(char *p);
 402 char *nasm_get_word(char *p, char **tail);
 403 char *nasm_opt_val(char *p, char **opt, char **val);
 404
 405 /*
 406  * Converts a relative pathname rel_path into an absolute path name.
 407  *
 408  * The buffer returned must be freed by the caller
 409  */
 410 char *nasm_realpath(const char *rel_path);
 411
 412 const char *prefix_name(int);
 413
 414 #define ZERO_BUF_SIZE 4096      /* Default value */
 415 #if defined(BUFSIZ) && (BUFSIZ > ZERO_BUF_SIZE)
 416 # undef ZERO_BUF_SIZE
 417 # define ZERO_BUF_SIZE BUFSIZ
 418 #endif
 419 extern const uint8_t zero_buffer[ZERO_BUF_SIZE];
 420 void fwritezero(size_t bytes, FILE *fp);
 421
 422 static inline bool overflow_general(int64_t value, int bytes)
 423 {
 424     int sbit;
 425     int64_t vmax, vmin;
 426
 427     if (bytes >= 8)
 428         return false;
 429
 430     sbit = (bytes << 3) - 1;
 431     vmax =  ((int64_t)2 << sbit) - 1;
 432     vmin = -((int64_t)1 << sbit);
 433
 434     return value < vmin || value > vmax;
 435 }
 436
 437 static inline bool overflow_signed(int64_t value, int bytes)
 438 {
 439     int sbit;
 440     int64_t vmax, vmin;
 441
 442     if (bytes >= 8)
 443         return false;
 444
 445     sbit = (bytes << 3) - 1;
 446     vmax =  ((int64_t)1 << sbit) - 1;
 447     vmin = -((int64_t)1 << sbit);
 448
 449     return value < vmin || value > vmax;
 450 }
 451
 452 static inline bool overflow_unsigned(int64_t value, int bytes)
 453 {
 454     int sbit;
 455     int64_t vmax, vmin;
 456
 457     if (bytes >= 8)
 458         return false;
 459
 460     sbit = (bytes << 3) - 1;
 461     vmax = ((int64_t)2 << sbit) - 1;
 462     vmin = 0;
 463
 464     return value < vmin || value > vmax;
 465 }
 466
 467 static inline int64_t signed_bits(int64_t value, int bits)
 468 {
 469     if (bits < 64) {
 470         value &= ((int64_t)1 << bits) - 1;
 471         if (value & (int64_t)1 << (bits - 1))
 472             value |= (int64_t)((uint64_t)-1 << bits);
 473     }
 474     return value;
 475 }
 476
 477 int idata_bytes(int opcode);
 478
 479 /* check if value is power of 2 */
 480 #define is_power2(v)   ((v) && ((v) & ((v) - 1)) == 0)
 481
 482 /*
 483  * floor(log2(v))
 484  */
 485 int ilog2_32(uint32_t v);
 486 int ilog2_64(uint64_t v);
 487
 488 /*
 489  * v == 0 ? 0 : is_power2(x) ? ilog2_X(v) : -1
 490  */
 491 int alignlog2_32(uint32_t v);
 492 int alignlog2_64(uint64_t v);
 493
 494 #endif