include/nasmlib.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2017 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 <stdio.h>
  44 #include <string.h>
  45 #ifdef HAVE_STRINGS_H
  46 # include <strings.h>
  47 #endif
  48
  49 /*
  50  * tolower table -- avoids a function call on some platforms.
  51  * NOTE: unlike the tolower() function in ctype, EOF is *NOT*
  52  * a permitted value, for obvious reasons.
  53  */
  54 void tolower_init(void);
  55 extern unsigned char nasm_tolower_tab[256];
  56 #define nasm_tolower(x) nasm_tolower_tab[(unsigned char)(x)]
  57
  58 /* Wrappers around <ctype.h> functions */
  59 /* These are only valid for values that cannot include EOF */
  60 #define nasm_isspace(x)  isspace((unsigned char)(x))
  61 #define nasm_isalpha(x)  isalpha((unsigned char)(x))
  62 #define nasm_isdigit(x)  isdigit((unsigned char)(x))
  63 #define nasm_isalnum(x)  isalnum((unsigned char)(x))
  64 #define nasm_isxdigit(x) isxdigit((unsigned char)(x))
  65
  66 /*
  67  * -------------------------
  68  * Error reporting functions
  69  * -------------------------
  70  */
  71
  72 /*
  73  * An error reporting function should look like this.
  74  */
  75 void printf_func(2, 3) nasm_error(int severity, const char *fmt, ...);
  76 no_return printf_func(2, 3) nasm_fatal(int flags, const char *fmt, ...);
  77 no_return printf_func(2, 3) nasm_panic(int flags, const char *fmt, ...);
  78 no_return nasm_panic_from_macro(const char *file, int line);
  79 #define panic() nasm_panic_from_macro(__FILE__, __LINE__);
  80
  81 typedef void (*vefunc) (int severity, const char *fmt, va_list ap);
  82 extern vefunc nasm_verror;
  83 static inline vefunc nasm_set_verror(vefunc ve)
  84 {
  85     vefunc old_verror = nasm_verror;
  86     nasm_verror = ve;
  87     return old_verror;
  88 }
  89
  90 /*
  91  * These are the error severity codes which get passed as the first
  92  * argument to an efunc.
  93  */
  94
  95 #define ERR_DEBUG       0x00000000      /* put out debugging message */
  96 #define ERR_WARNING     0x00000001      /* warn only: no further action */
  97 #define ERR_NONFATAL    0x00000002      /* terminate assembly after phase */
  98 #define ERR_FATAL       0x00000006      /* instantly fatal: exit with error */
  99 #define ERR_PANIC       0x00000007      /* internal error: panic instantly
 100                                          * and dump core for reference */
 101 #define ERR_MASK        0x00000007      /* mask off the above codes */
 102 #define ERR_NOFILE      0x00000010      /* don't give source file name/line */
 103 #define ERR_USAGE       0x00000020      /* print a usage message */
 104 #define ERR_PASS1       0x00000040      /* only print this error on pass one */
 105 #define ERR_PASS2       0x00000080
 106
 107 #define ERR_NO_SEVERITY 0x00000100      /* suppress printing severity */
 108 #define ERR_PP_PRECOND  0x00000200      /* for preprocessor use */
 109 #define ERR_PP_LISTMACRO 0x00000400     /* from preproc->error_list_macros() */
 110
 111 /*
 112  * These codes define specific types of suppressible warning.
 113  */
 114
 115 #define ERR_WARN_MASK   0xFFFFF000      /* the mask for this feature */
 116 #define ERR_WARN_SHR    12              /* how far to shift right */
 117
 118 #define WARN(x)         ((x) << ERR_WARN_SHR)
 119 #define WARN_IDX(x)     (((x) & ERR_WARN_MASK) >> ERR_WARN_SHR)
 120
 121 #define ERR_WARN_TERM           WARN( 0) /* treat warnings as errors */
 122 #define ERR_WARN_MNP            WARN( 1) /* macro-num-parameters warning */
 123 #define ERR_WARN_MSR            WARN( 2) /* macro self-reference */
 124 #define ERR_WARN_MDP            WARN( 3) /* macro default parameters check */
 125 #define ERR_WARN_OL             WARN( 4) /* orphan label (no colon, and
 126                                           * alone on line) */
 127 #define ERR_WARN_NOV            WARN( 5) /* numeric overflow */
 128 #define ERR_WARN_GNUELF         WARN( 6) /* using GNU ELF extensions */
 129 #define ERR_WARN_FL_OVERFLOW    WARN( 7) /* FP overflow */
 130 #define ERR_WARN_FL_DENORM      WARN( 8) /* FP denormal */
 131 #define ERR_WARN_FL_UNDERFLOW   WARN( 9) /* FP underflow */
 132 #define ERR_WARN_FL_TOOLONG     WARN(10) /* FP too many digits */
 133 #define ERR_WARN_USER           WARN(11) /* %warning directives */
 134 #define ERR_WARN_LOCK           WARN(12) /* bad LOCK prefixes */
 135 #define ERR_WARN_HLE            WARN(13) /* bad HLE prefixes */
 136 #define ERR_WARN_BND            WARN(14) /* bad BND prefixes */
 137 #define ERR_WARN_ZEXTRELOC      WARN(15) /* relocation zero-extended */
 138 #define ERR_WARN_PTR            WARN(16) /* not a NASM keyword */
 139 #define ERR_WARN_MAX            16       /* the highest numbered one */
 140
 141 /*
 142  * Wrappers around malloc, realloc and free. nasm_malloc will
 143  * fatal-error and die rather than return NULL; nasm_realloc will
 144  * do likewise, and will also guarantee to work right on being
 145  * passed a NULL pointer; nasm_free will do nothing if it is passed
 146  * a NULL pointer.
 147  */
 148 void * safe_malloc(1) nasm_malloc(size_t);
 149 void * safe_malloc(1) nasm_zalloc(size_t);
 150 void * safe_malloc2(1,2) nasm_calloc(size_t, size_t);
 151 void * safe_realloc(2) nasm_realloc(void *, size_t);
 152 void nasm_free(void *);
 153 char * safe_alloc nasm_strdup(const char *);
 154 char * safe_alloc nasm_strndup(const char *, size_t);
 155
 156 /* Assert the argument is a pointer without evaluating it */
 157 #define nasm_assert_pointer(p) ((void)sizeof(*(p)))
 158
 159 #define nasm_new(p) ((p) = nasm_zalloc(sizeof(*(p))))
 160 #define nasm_newn(p,n) ((p) = nasm_calloc(sizeof(*(p)),(n)))
 161 /*
 162  * This is broken on platforms where there are pointers which don't
 163  * match void * in their internal layout.  It unfortunately also
 164  * loses any "const" part of the argument, although hopefully the
 165  * compiler will warn in that case.
 166  */
 167 #define nasm_delete(p)                                          \
 168     do {                                                        \
 169         void **_pp = (void **)&(p);                             \
 170         nasm_assert_pointer(p);                                 \
 171         nasm_free(*_pp);                                        \
 172         *_pp = NULL;                                            \
 173     } while (0)
 174 #define nasm_zero(p) (memset((p), 0, sizeof(*(p))))
 175 #define nasm_zeron(p,n) (memset((p), 0, (n)*sizeof(*(p))))
 176
 177 /*
 178  * Wrapper around fwrite() which fatal-errors on output failure.
 179  */
 180 void nasm_write(const void *, size_t, FILE *);
 181
 182 /*
 183  * NASM assert failure
 184  */
 185 no_return nasm_assert_failed(const char *, int, const char *);
 186 #define nasm_assert(x)                                          \
 187     do {                                                        \
 188         if (unlikely(!(x)))                                     \
 189             nasm_assert_failed(__FILE__,__LINE__,#x);           \
 190     } while (0)
 191
 192 /*
 193  * NASM failure at build time if the argument is false
 194  */
 195 #ifdef static_assert
 196 # define nasm_static_assert(x) static_assert(x, #x)
 197 #elif defined(HAVE_FUNC_ATTRIBUTE_ERROR) && defined(__OPTIMIZE__)
 198 # define nasm_static_assert(x)                                           \
 199     if (!(x)) {                                                         \
 200         extern void __attribute__((error("assertion " #x " failed")))   \
 201             _nasm_static_fail(void);                                    \
 202         _nasm_static_fail();                                            \
 203     }
 204 #else
 205 /* See http://www.drdobbs.com/compile-time-assertions/184401873 */
 206 # define nasm_static_assert(x) \
 207     do { enum { _static_assert_failed = 1/(!!(x)) }; } while (0)
 208 #endif
 209
 210 /*
 211  * ANSI doesn't guarantee the presence of `stricmp' or
 212  * `strcasecmp'.
 213  */
 214 #if defined(HAVE_STRCASECMP)
 215 #define nasm_stricmp strcasecmp
 216 #elif defined(HAVE_STRICMP)
 217 #define nasm_stricmp stricmp
 218 #else
 219 int pure_func nasm_stricmp(const char *, const char *);
 220 #endif
 221
 222 #if defined(HAVE_STRNCASECMP)
 223 #define nasm_strnicmp strncasecmp
 224 #elif defined(HAVE_STRNICMP)
 225 #define nasm_strnicmp strnicmp
 226 #else
 227 int pure_func nasm_strnicmp(const char *, const char *, size_t);
 228 #endif
 229
 230 int pure_func nasm_memicmp(const char *, const char *, size_t);
 231
 232 #if defined(HAVE_STRSEP)
 233 #define nasm_strsep strsep
 234 #else
 235 char *nasm_strsep(char **stringp, const char *delim);
 236 #endif
 237
 238 #ifndef HAVE_DECL_STRNLEN
 239 size_t pure_func strnlen(const char *, size_t);
 240 #endif
 241
 242 /* This returns the numeric value of a given 'digit'. */
 243 #define numvalue(c)         ((c) >= 'a' ? (c) - 'a' + 10 : (c) >= 'A' ? (c) - 'A' + 10 : (c) - '0')
 244
 245 /*
 246  * Convert a string into a number, using NASM number rules. Sets
 247  * `*error' to true if an error occurs, and false otherwise.
 248  */
 249 int64_t readnum(char *str, bool *error);
 250
 251 /*
 252  * Convert a character constant into a number. Sets
 253  * `*warn' to true if an overflow occurs, and false otherwise.
 254  * str points to and length covers the middle of the string,
 255  * without the quotes.
 256  */
 257 int64_t readstrnum(char *str, int length, bool *warn);
 258
 259 /*
 260  * seg_init: Initialise the segment-number allocator.
 261  * seg_alloc: allocate a hitherto unused segment number.
 262  */
 263 void pure_func seg_init(void);
 264 int32_t pure_func seg_alloc(void);
 265
 266 /*
 267  * many output formats will be able to make use of this: a standard
 268  * function to add an extension to the name of the input file
 269  */
 270 void standard_extension(char *inname, char *outname, char *extension);
 271
 272 /*
 273  * Utility macros...
 274  *
 275  * This is a useful #define which I keep meaning to use more often:
 276  * the number of elements of a statically defined array.
 277  */
 278 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 279
 280 /*
 281  * List handling
 282  *
 283  *  list_for_each - regular iterator over list
 284  *  list_for_each_safe - the same but safe against list items removal
 285  *  list_last - find the last element in a list
 286  */
 287 #define list_for_each(pos, head)                        \
 288     for (pos = head; pos; pos = pos->next)
 289 #define list_for_each_safe(pos, n, head)                \
 290     for (pos = head, n = (pos ? pos->next : NULL); pos; \
 291         pos = n, n = (n ? n->next : NULL))
 292 #define list_last(pos, head)                            \
 293     for (pos = head; pos && pos->next; pos = pos->next) \
 294         ;
 295 #define list_reverse(head, prev, next)                  \
 296     do {                                                \
 297         if (!head || !head->next)                       \
 298             break;                                      \
 299         prev = NULL;                                    \
 300         while (head) {                                  \
 301             next = head->next;                          \
 302             head->next = prev;                          \
 303             prev = head;                                \
 304             head = next;                                \
 305         }                                               \
 306         head = prev;                                    \
 307     } while (0)
 308
 309 /*
 310  * Power of 2 align helpers
 311  */
 312 #undef ALIGN_MASK               /* Some BSD flavors define these in system headers */
 313 #undef ALIGN
 314 #define ALIGN_MASK(v, mask)     (((v) + (mask)) & ~(mask))
 315 #define ALIGN(v, a)             ALIGN_MASK(v, (a) - 1)
 316 #define IS_ALIGNED(v, a)        (((v) & ((a) - 1)) == 0)
 317
 318 /*
 319  * some handy macros that will probably be of use in more than one
 320  * output format: convert integers into little-endian byte packed
 321  * format in memory
 322  */
 323
 324 #if X86_MEMORY
 325
 326 #define WRITECHAR(p,v)                          \
 327     do {                                        \
 328         *(uint8_t *)(p) = (v);                  \
 329         (p) += 1;                               \
 330     } while (0)
 331
 332 #define WRITESHORT(p,v)                         \
 333     do {                                        \
 334         *(uint16_t *)(p) = (v);                 \
 335         (p) += 2;                               \
 336     } while (0)
 337
 338 #define WRITELONG(p,v)                          \
 339     do {                                        \
 340         *(uint32_t *)(p) = (v);                 \
 341         (p) += 4;                               \
 342     } while (0)
 343
 344 #define WRITEDLONG(p,v)                         \
 345     do {                                        \
 346         *(uint64_t *)(p) = (v);                 \
 347         (p) += 8;                               \
 348     } while (0)
 349
 350 #define WRITEADDR(p,v,s)                        \
 351     do {                                        \
 352         uint64_t _wa_v = (v);                   \
 353         memcpy((p), &_wa_v, (s));               \
 354         (p) += (s);                             \
 355     } while (0)
 356
 357 #else /* !X86_MEMORY */
 358
 359 #define WRITECHAR(p,v)                          \
 360     do {                                        \
 361         uint8_t *_wc_p = (uint8_t *)(p);        \
 362         uint8_t _wc_v = (v);                    \
 363         _wc_p[0] = _wc_v;                       \
 364         (p) = (void *)(_wc_p + 1);              \
 365     } while (0)
 366
 367 #define WRITESHORT(p,v)                         \
 368     do {                                        \
 369         uint8_t *_ws_p = (uint8_t *)(p);        \
 370         uint16_t _ws_v = (v);                   \
 371         _ws_p[0] = _ws_v;                       \
 372         _ws_p[1] = _ws_v >> 8;                  \
 373         (p) = (void *)(_ws_p + 2);              \
 374     } while (0)
 375
 376 #define WRITELONG(p,v)                          \
 377     do {                                        \
 378         uint8_t *_wl_p = (uint8_t *)(p);        \
 379         uint32_t _wl_v = (v);                   \
 380         _wl_p[0] = _wl_v;                       \
 381         _wl_p[1] = _wl_v >> 8;                  \
 382         _wl_p[2] = _wl_v >> 16;                 \
 383         _wl_p[3] = _wl_v >> 24;                 \
 384         (p) = (void *)(_wl_p + 4);              \
 385     } while (0)
 386
 387 #define WRITEDLONG(p,v)                         \
 388     do {                                        \
 389         uint8_t *_wq_p = (uint8_t *)(p);        \
 390         uint64_t _wq_v = (v);                   \
 391         _wq_p[0] = _wq_v;                       \
 392         _wq_p[1] = _wq_v >> 8;                  \
 393         _wq_p[2] = _wq_v >> 16;                 \
 394         _wq_p[3] = _wq_v >> 24;                 \
 395         _wq_p[4] = _wq_v >> 32;                 \
 396         _wq_p[5] = _wq_v >> 40;                 \
 397         _wq_p[6] = _wq_v >> 48;                 \
 398         _wq_p[7] = _wq_v >> 56;                 \
 399         (p) = (void *)(_wq_p + 8);              \
 400     } while (0)
 401
 402 #define WRITEADDR(p,v,s)                        \
 403     do {                                        \
 404         int _wa_s = (s);                        \
 405         uint64_t _wa_v = (v);                   \
 406         while (_wa_s--) {                       \
 407             WRITECHAR(p,_wa_v);                 \
 408             _wa_v >>= 8;                        \
 409         }                                       \
 410     } while(0)
 411
 412 #endif
 413
 414 /*
 415  * and routines to do the same thing to a file
 416  */
 417 #define fwriteint8_t(d,f) putc(d,f)
 418 void fwriteint16_t(uint16_t data, FILE * fp);
 419 void fwriteint32_t(uint32_t data, FILE * fp);
 420 void fwriteint64_t(uint64_t data, FILE * fp);
 421 void fwriteaddr(uint64_t data, int size, FILE * fp);
 422
 423 /*
 424  * Binary search routine. Returns index into `array' of an entry
 425  * matching `string', or <0 if no match. `array' is taken to
 426  * contain `size' elements.
 427  *
 428  * bsi() is case sensitive, bsii() is case insensitive.
 429  */
 430 int bsi(const char *string, const char **array, int size);
 431 int bsii(const char *string, const char **array, int size);
 432
 433 /*
 434  * These functions are used to keep track of the source code file and name.
 435  */
 436 void src_init(void);
 437 void src_free(void);
 438 const char *src_set_fname(const char *newname);
 439 const char *src_get_fname(void);
 440 int32_t src_set_linnum(int32_t newline);
 441 int32_t src_get_linnum(void);
 442 /* Can be used when there is no need for the old information */
 443 void src_set(int32_t line, const char *filename);
 444 /*
 445  * src_get gets both the source file name and line.
 446  * It is also used if you maintain private status about the source location
 447  * It return 0 if the information was the same as the last time you
 448  * checked, -2 if the name changed and (new-old) if just the line changed.
 449  */
 450 int32_t src_get(int32_t *xline, const char **xname);
 451
 452 char *nasm_strcat(const char *one, const char *two);
 453
 454 char *nasm_skip_spaces(const char *p);
 455 char *nasm_skip_word(const char *p);
 456 char *nasm_zap_spaces_fwd(char *p);
 457 char *nasm_zap_spaces_rev(char *p);
 458 char *nasm_trim_spaces(char *p);
 459 char *nasm_get_word(char *p, char **tail);
 460 char *nasm_opt_val(char *p, char **opt, char **val);
 461
 462 /*
 463  * Converts a relative pathname rel_path into an absolute path name.
 464  *
 465  * The buffer returned must be freed by the caller
 466  */
 467 char *nasm_realpath(const char *rel_path);
 468
 469 const char * pure_func prefix_name(int);
 470
 471 /*
 472  * Wrappers around fopen()... for future change to a dedicated structure
 473  */
 474 enum file_flags {
 475     NF_BINARY   = 0x00000000,   /* Binary file (default) */
 476     NF_TEXT     = 0x00000001,   /* Text file */
 477     NF_NONFATAL = 0x00000000,   /* Don't die on open failure (default) */
 478     NF_FATAL    = 0x00000002,   /* Die on open failure */
 479     NF_FORMAP   = 0x00000004    /* Intended to use nasm_map_file() */
 480 };
 481
 482 FILE *nasm_open_read(const char *filename, enum file_flags flags);
 483 FILE *nasm_open_write(const char *filename, enum file_flags flags);
 484
 485 /* Probe for existence of a file */
 486 bool nasm_file_exists(const char *filename);
 487
 488 #define ZERO_BUF_SIZE 65536     /* Default value */
 489 #if defined(BUFSIZ) && (BUFSIZ > ZERO_BUF_SIZE)
 490 # undef ZERO_BUF_SIZE
 491 # define ZERO_BUF_SIZE BUFSIZ
 492 #endif
 493 extern const uint8_t zero_buffer[ZERO_BUF_SIZE];
 494
 495 /* Missing fseeko/ftello */
 496 #ifndef HAVE_FSEEKO
 497 # undef off_t                   /* Just in case it is a macro */
 498 # ifdef HAVE__FSEEKI64
 499 #  define fseeko _fseeki64
 500 #  define ftello _ftelli64
 501 #  define off_t  int64_t
 502 # else
 503 #  define fseeko fseek
 504 #  define ftello ftell
 505 #  define off_t  long
 506 # endif
 507 #endif
 508
 509 const void *nasm_map_file(FILE *fp, off_t start, off_t len);
 510 void nasm_unmap_file(const void *p, size_t len);
 511 off_t nasm_file_size(FILE *f);
 512 off_t nasm_file_size_by_path(const char *pathname);
 513 void fwritezero(off_t bytes, FILE *fp);
 514
 515 static inline bool const_func overflow_general(int64_t value, int bytes)
 516 {
 517     int sbit;
 518     int64_t vmax, vmin;
 519
 520     if (bytes >= 8)
 521         return false;
 522
 523     sbit = (bytes << 3) - 1;
 524     vmax =  ((int64_t)2 << sbit) - 1;
 525     vmin = -((int64_t)1 << sbit);
 526
 527     return value < vmin || value > vmax;
 528 }
 529
 530 static inline bool const_func overflow_signed(int64_t value, int bytes)
 531 {
 532     int sbit;
 533     int64_t vmax, vmin;
 534
 535     if (bytes >= 8)
 536         return false;
 537
 538     sbit = (bytes << 3) - 1;
 539     vmax =  ((int64_t)1 << sbit) - 1;
 540     vmin = -((int64_t)1 << sbit);
 541
 542     return value < vmin || value > vmax;
 543 }
 544
 545 static inline bool const_func overflow_unsigned(int64_t value, int bytes)
 546 {
 547     int sbit;
 548     int64_t vmax, vmin;
 549
 550     if (bytes >= 8)
 551         return false;
 552
 553     sbit = (bytes << 3) - 1;
 554     vmax = ((int64_t)2 << sbit) - 1;
 555     vmin = 0;
 556
 557     return value < vmin || value > vmax;
 558 }
 559
 560 static inline int64_t const_func signed_bits(int64_t value, int bits)
 561 {
 562     if (bits < 64) {
 563         value &= ((int64_t)1 << bits) - 1;
 564         if (value & (int64_t)1 << (bits - 1))
 565             value |= (int64_t)((uint64_t)-1 << bits);
 566     }
 567     return value;
 568 }
 569
 570 int const_func idata_bytes(int opcode);
 571
 572 /* check if value is power of 2 */
 573 #define is_power2(v)   ((v) && ((v) & ((v) - 1)) == 0)
 574
 575 /*
 576  * floor(log2(v))
 577  */
 578 int const_func ilog2_32(uint32_t v);
 579 int const_func ilog2_64(uint64_t v);
 580
 581 /*
 582  * v == 0 ? 0 : is_power2(x) ? ilog2_X(v) : -1
 583  */
 584 int const_func alignlog2_32(uint32_t v);
 585 int const_func alignlog2_64(uint64_t v);
 586
 587 #endif