nasmlib.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 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  * If this is defined, the wrappers around malloc et al will
  69  * transform into logging variants, which will cause NASM to create
  70  * a file called `malloc.log' when run, and spew details of all its
  71  * memory management into that. That can then be analysed to detect
  72  * memory leaks and potentially other problems too.
  73  */
  74 /* #define LOGALLOC */
  75
  76 /*
  77  * -------------------------
  78  * Error reporting functions
  79  * -------------------------
  80  */
  81
  82 /*
  83  * An error reporting function should look like this.
  84  */
  85 typedef void (*efunc) (int severity, const char *fmt, ...);
  86 typedef void (*vefunc) (int severity, const char *fmt, va_list ap);
  87 #ifdef __GNUC__
  88 void nasm_error(int severity, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
  89 #else
  90 void nasm_error(int severity, const char *fmt, ...);
  91 #endif
  92 void nasm_set_verror(vefunc);
  93
  94 /*
  95  * These are the error severity codes which get passed as the first
  96  * argument to an efunc.
  97  */
  98
  99 #define ERR_DEBUG       0x00000008      /* put out debugging message */
 100 #define ERR_WARNING     0x00000000      /* warn only: no further action */
 101 #define ERR_NONFATAL    0x00000001      /* terminate assembly after phase */
 102 #define ERR_FATAL       0x00000002      /* instantly fatal: exit with error */
 103 #define ERR_PANIC       0x00000003      /* internal error: panic instantly
 104                                          * and dump core for reference */
 105 #define ERR_MASK        0x0000000F      /* mask off the above codes */
 106 #define ERR_NOFILE      0x00000010      /* don't give source file name/line */
 107 #define ERR_USAGE       0x00000020      /* print a usage message */
 108 #define ERR_PASS1       0x00000040      /* only print this error on pass one */
 109 #define ERR_PASS2       0x00000080
 110 #define ERR_NO_SEVERITY 0x00000100      /* suppress printing severity */
 111
 112 /*
 113  * These codes define specific types of suppressible warning.
 114  */
 115
 116 #define ERR_WARN_MASK   0xFFFFF000      /* the mask for this feature */
 117 #define ERR_WARN_SHR    12              /* how far to shift right */
 118
 119 #define WARN(x)         ((x) << ERR_WARN_SHR)
 120 #define WARN_IDX(x)     (((x) & ERR_WARN_MASK) >> ERR_WARN_SHR)
 121
 122 #define ERR_WARN_TERM           WARN( 0) /* treat warnings as errors */
 123 #define ERR_WARN_MNP            WARN( 1) /* macro-num-parameters warning */
 124 #define ERR_WARN_MSR            WARN( 2) /* macro self-reference */
 125 #define ERR_WARN_MDP            WARN( 3) /* macro default parameters check */
 126 #define ERR_WARN_OL             WARN( 4) /* orphan label (no colon, and
 127                                           * alone on line) */
 128 #define ERR_WARN_NOV            WARN( 5) /* numeric overflow */
 129 #define ERR_WARN_GNUELF         WARN( 6) /* using GNU ELF extensions */
 130 #define ERR_WARN_FL_OVERFLOW    WARN( 7) /* FP overflow */
 131 #define ERR_WARN_FL_DENORM      WARN( 8) /* FP denormal */
 132 #define ERR_WARN_FL_UNDERFLOW   WARN( 9) /* FP underflow */
 133 #define ERR_WARN_FL_TOOLONG     WARN(10) /* FP too many digits */
 134 #define ERR_WARN_USER           WARN(11) /* %warning directives */
 135 #define ERR_WARN_MAX            11       /* the highest numbered one */
 136
 137 /*
 138  * Wrappers around malloc, realloc and free. nasm_malloc will
 139  * fatal-error and die rather than return NULL; nasm_realloc will
 140  * do likewise, and will also guarantee to work right on being
 141  * passed a NULL pointer; nasm_free will do nothing if it is passed
 142  * a NULL pointer.
 143  */
 144 void nasm_init_malloc_error(void);
 145 #ifndef LOGALLOC
 146 void *nasm_malloc(size_t);
 147 void *nasm_zalloc(size_t);
 148 void *nasm_realloc(void *, size_t);
 149 void nasm_free(void *);
 150 char *nasm_strdup(const char *);
 151 char *nasm_strndup(const char *, size_t);
 152 #else
 153 void *nasm_malloc_log(const char *, int, size_t);
 154 void *nasm_zalloc_log(const char *, int, size_t);
 155 void *nasm_realloc_log(const char *, int, void *, size_t);
 156 void nasm_free_log(const char *, int, void *);
 157 char *nasm_strdup_log(const char *, int, const char *);
 158 char *nasm_strndup_log(const char *, int, const char *, size_t);
 159 #define nasm_malloc(x) nasm_malloc_log(__FILE__,__LINE__,x)
 160 #define nasm_zalloc(x) nasm_zalloc_log(__FILE__,__LINE__,x)
 161 #define nasm_realloc(x,y) nasm_realloc_log(__FILE__,__LINE__,x,y)
 162 #define nasm_free(x) nasm_free_log(__FILE__,__LINE__,x)
 163 #define nasm_strdup(x) nasm_strdup_log(__FILE__,__LINE__,x)
 164 #define nasm_strndup(x,y) nasm_strndup_log(__FILE__,__LINE__,x,y)
 165 #endif
 166
 167 /*
 168  * NASM assert failure
 169  */
 170 no_return nasm_assert_failed(const char *, int, const char *);
 171 #define nasm_assert(x)                                          \
 172     do {                                                        \
 173         if (unlikely(!(x)))                                     \
 174             nasm_assert_failed(__FILE__,__LINE__,#x);           \
 175     } while (0)
 176
 177 /*
 178  * NASM failure at build time if x != 0
 179  */
 180 #define nasm_build_assert(x) (void)(sizeof(char[1-2*!!(x)]))
 181
 182 /*
 183  * ANSI doesn't guarantee the presence of `stricmp' or
 184  * `strcasecmp'.
 185  */
 186 #if defined(HAVE_STRCASECMP)
 187 #define nasm_stricmp strcasecmp
 188 #elif defined(HAVE_STRICMP)
 189 #define nasm_stricmp stricmp
 190 #else
 191 int nasm_stricmp(const char *, const char *);
 192 #endif
 193
 194 #if defined(HAVE_STRNCASECMP)
 195 #define nasm_strnicmp strncasecmp
 196 #elif defined(HAVE_STRNICMP)
 197 #define nasm_strnicmp strnicmp
 198 #else
 199 int nasm_strnicmp(const char *, const char *, size_t);
 200 #endif
 201
 202 int nasm_memicmp(const char *, const char *, size_t);
 203
 204 #if defined(HAVE_STRSEP)
 205 #define nasm_strsep strsep
 206 #else
 207 char *nasm_strsep(char **stringp, const char *delim);
 208 #endif
 209
 210 /* This returns the numeric value of a given 'digit'. */
 211 #define numvalue(c)         ((c) >= 'a' ? (c) - 'a' + 10 : (c) >= 'A' ? (c) - 'A' + 10 : (c) - '0')
 212
 213 /*
 214  * Convert a string into a number, using NASM number rules. Sets
 215  * `*error' to true if an error occurs, and false otherwise.
 216  */
 217 int64_t readnum(char *str, bool *error);
 218
 219 /*
 220  * Convert a character constant into a number. Sets
 221  * `*warn' to true if an overflow occurs, and false otherwise.
 222  * str points to and length covers the middle of the string,
 223  * without the quotes.
 224  */
 225 int64_t readstrnum(char *str, int length, bool *warn);
 226
 227 /*
 228  * seg_init: Initialise the segment-number allocator.
 229  * seg_alloc: allocate a hitherto unused segment number.
 230  */
 231 void seg_init(void);
 232 int32_t seg_alloc(void);
 233
 234 /*
 235  * many output formats will be able to make use of this: a standard
 236  * function to add an extension to the name of the input file
 237  */
 238 void standard_extension(char *inname, char *outname, char *extension);
 239
 240 /*
 241  * Utility macros...
 242  *
 243  * This is a useful #define which I keep meaning to use more often:
 244  * the number of elements of a statically defined array.
 245  */
 246 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 247
 248 /*
 249  * List handling
 250  *
 251  *  list_for_each - regular iterator over list
 252  *  list_for_each_safe - the same but safe against list items removal
 253  *  list_last - find the last element in a list
 254  */
 255 #define list_for_each(pos, head)                        \
 256     for (pos = head; pos; pos = pos->next)
 257 #define list_for_each_safe(pos, n, head)                \
 258     for (pos = head, n = (pos ? pos->next : NULL); pos; \
 259         pos = n, n = (n ? n->next : NULL))
 260 #define list_last(pos, head)                            \
 261     for (pos = head; pos && pos->next; pos = pos->next) \
 262         ;
 263 #define list_reverse(head, prev, next)                  \
 264     do {                                                \
 265         if (!head || !head->next)                       \
 266             break;                                      \
 267         prev = NULL;                                    \
 268         while (head) {                                  \
 269             next = head->next;                          \
 270             head->next = prev;                          \
 271             prev = head;                                \
 272             head = next;                                \
 273         }                                               \
 274         head = prev;                                    \
 275     } while (0)
 276
 277 /*
 278  * Power of 2 align helpers
 279  */
 280 #define ALIGN_MASK(v, mask)     (((v) + (mask)) & ~(mask))
 281 #define ALIGN(v, a)             ALIGN_MASK(v, (a) - 1)
 282 #define IS_ALIGNED(v, a)        (((v) & ((a) - 1)) == 0)
 283
 284 /*
 285  * some handy macros that will probably be of use in more than one
 286  * output format: convert integers into little-endian byte packed
 287  * format in memory
 288  */
 289
 290 #if X86_MEMORY
 291
 292 #define WRITECHAR(p,v)                          \
 293     do {                                        \
 294         *(uint8_t *)(p) = (v);                  \
 295         (p) += 1;                               \
 296     } while (0)
 297
 298 #define WRITESHORT(p,v)                         \
 299     do {                                        \
 300         *(uint16_t *)(p) = (v);                 \
 301         (p) += 2;                               \
 302     } while (0)
 303
 304 #define WRITELONG(p,v)                          \
 305     do {                                        \
 306         *(uint32_t *)(p) = (v);                 \
 307         (p) += 4;                               \
 308     } while (0)
 309
 310 #define WRITEDLONG(p,v)                         \
 311     do {                                        \
 312         *(uint64_t *)(p) = (v);                 \
 313         (p) += 8;                               \
 314     } while (0)
 315
 316 #define WRITEADDR(p,v,s)                        \
 317     do {                                        \
 318         uint64_t _wa_v = (v);                   \
 319         memcpy((p), &_wa_v, (s));               \
 320         (p) += (s);                             \
 321     } while (0)
 322
 323 #else /* !X86_MEMORY */
 324
 325 #define WRITECHAR(p,v)                          \
 326     do {                                        \
 327         uint8_t *_wc_p = (uint8_t *)(p);        \
 328         uint8_t _wc_v = (v);                    \
 329         _wc_p[0] = _wc_v;                       \
 330         (p) = (void *)(_wc_p + 1);              \
 331     } while (0)
 332
 333 #define WRITESHORT(p,v)                         \
 334     do {                                        \
 335         uint8_t *_ws_p = (uint8_t *)(p);        \
 336         uint16_t _ws_v = (v);                   \
 337         _ws_p[0] = _ws_v;                       \
 338         _ws_p[1] = _ws_v >> 8;                  \
 339         (p) = (void *)(_ws_p + 2);              \
 340     } while (0)
 341
 342 #define WRITELONG(p,v)                          \
 343     do {                                        \
 344         uint8_t *_wl_p = (uint8_t *)(p);        \
 345         uint32_t _wl_v = (v);                   \
 346         _wl_p[0] = _wl_v;                       \
 347         _wl_p[1] = _wl_v >> 8;                  \
 348         _wl_p[2] = _wl_v >> 16;                 \
 349         _wl_p[3] = _wl_v >> 24;                 \
 350         (p) = (void *)(_wl_p + 4);              \
 351     } while (0)
 352
 353 #define WRITEDLONG(p,v)                         \
 354     do {                                        \
 355         uint8_t *_wq_p = (uint8_t *)(p);        \
 356         uint64_t _wq_v = (v);                   \
 357         _wq_p[0] = _wq_v;                       \
 358         _wq_p[1] = _wq_v >> 8;                  \
 359         _wq_p[2] = _wq_v >> 16;                 \
 360         _wq_p[3] = _wq_v >> 24;                 \
 361         _wq_p[4] = _wq_v >> 32;                 \
 362         _wq_p[5] = _wq_v >> 40;                 \
 363         _wq_p[6] = _wq_v >> 48;                 \
 364         _wq_p[7] = _wq_v >> 56;                 \
 365         (p) = (void *)(_wq_p + 8);              \
 366     } while (0)
 367
 368 #define WRITEADDR(p,v,s)                        \
 369     do {                                        \
 370         int _wa_s = (s);                        \
 371         uint64_t _wa_v = (v);                   \
 372         while (_wa_s--) {                       \
 373             WRITECHAR(p,_wa_v);                 \
 374             _wa_v >>= 8;                        \
 375         }                                       \
 376     } while(0)
 377
 378 #endif
 379
 380 /*
 381  * and routines to do the same thing to a file
 382  */
 383 #define fwriteint8_t(d,f) putc(d,f)
 384 void fwriteint16_t(uint16_t data, FILE * fp);
 385 void fwriteint32_t(uint32_t data, FILE * fp);
 386 void fwriteint64_t(uint64_t data, FILE * fp);
 387 void fwriteaddr(uint64_t data, int size, FILE * fp);
 388
 389 /*
 390  * Binary search routine. Returns index into `array' of an entry
 391  * matching `string', or <0 if no match. `array' is taken to
 392  * contain `size' elements.
 393  *
 394  * bsi() is case sensitive, bsii() is case insensitive.
 395  */
 396 int bsi(const char *string, const char **array, int size);
 397 int bsii(const char *string, const char **array, int size);
 398
 399 char *src_set_fname(char *newname);
 400 int32_t src_set_linnum(int32_t newline);
 401 int32_t src_get_linnum(void);
 402 /*
 403  * src_get may be used if you simply want to know the source file and line.
 404  * It is also used if you maintain private status about the source location
 405  * It return 0 if the information was the same as the last time you
 406  * checked, -1 if the name changed and (new-old) if just the line changed.
 407  */
 408 int src_get(int32_t *xline, char **xname);
 409
 410 char *nasm_strcat(const char *one, const char *two);
 411
 412 char *nasm_skip_spaces(const char *p);
 413 char *nasm_skip_word(const char *p);
 414 char *nasm_zap_spaces_fwd(char *p);
 415 char *nasm_zap_spaces_rev(char *p);
 416 char *nasm_trim_spaces(char *p);
 417 char *nasm_get_word(char *p, char **tail);
 418 char *nasm_opt_val(char *p, char **opt, char **val);
 419
 420 const char *prefix_name(int);
 421
 422 #define ZERO_BUF_SIZE 4096
 423 extern const uint8_t zero_buffer[ZERO_BUF_SIZE];
 424 size_t fwritezero(size_t bytes, FILE *fp);
 425
 426 static inline bool overflow_general(int64_t value, int bytes)
 427 {
 428     int sbit;
 429     int64_t vmax, vmin;
 430
 431     if (bytes >= 8)
 432         return false;
 433
 434     sbit = (bytes << 3) - 1;
 435     vmax =  ((int64_t)2 << sbit) - 1;
 436     vmin = -((int64_t)1 << sbit);
 437
 438     return value < vmin || value > vmax;
 439 }
 440
 441 static inline bool overflow_signed(int64_t value, int bytes)
 442 {
 443     int sbit;
 444     int64_t vmax, vmin;
 445
 446     if (bytes >= 8)
 447         return false;
 448
 449     sbit = (bytes << 3) - 1;
 450     vmax =  ((int64_t)1 << sbit) - 1;
 451     vmin = -((int64_t)1 << sbit);
 452
 453     return value < vmin || value > vmax;
 454 }
 455
 456 static inline bool overflow_unsigned(int64_t value, int bytes)
 457 {
 458     int sbit;
 459     int64_t vmax, vmin;
 460
 461     if (bytes >= 8)
 462         return false;
 463
 464     sbit = (bytes << 3) - 1;
 465     vmax = ((int64_t)2 << sbit) - 1;
 466     vmin = 0;
 467
 468     return value < vmin || value > vmax;
 469 }
 470
 471 static inline int64_t signed_bits(int64_t value, int bits)
 472 {
 473     if (bits < 64) {
 474         value &= ((int64_t)1 << bits) - 1;
 475         if (value & (int64_t)1 << (bits - 1))
 476             value |= (int64_t)-1 << bits;
 477     }
 478     return value;
 479 }
 480
 481 int idata_bytes(int opcode);
 482
 483 /* check if value is power of 2 */
 484 #define is_power2(v)   ((v) && ((v) & ((v) - 1)) == 0)
 485
 486 /*
 487  * floor(log2(v))
 488  */
 489 int ilog2_32(uint32_t v);
 490 int ilog2_64(uint64_t v);
 491
 492 /*
 493  * v == 0 ? 0 : is_power2(x) ? ilog2_X(v) : -1
 494  */
 495 int alignlog2_32(uint32_t v);
 496 int alignlog2_64(uint64_t v);
 497
 498 #endif