1 /** 2 * \file libyasm/bytecode.h 3 * \brief YASM bytecode interface. 4 * 5 * \license 6 * Copyright (C) 2001-2007 Peter Johnson 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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 copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS'' 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE 21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 * \endlicense 29 */ 30 #ifndef YASM_BYTECODE_H 31 #define YASM_BYTECODE_H 32 33 #ifndef YASM_LIB_DECL 34 #define YASM_LIB_DECL 35 #endif 36 37 /** A data value (opaque type). */ 38 typedef struct yasm_dataval yasm_dataval; 39 /** A list of data values. */ 40 typedef struct yasm_datavalhead yasm_datavalhead; 41 42 /** Linked list of data values. */ 43 /*@reldef@*/ STAILQ_HEAD(yasm_datavalhead, yasm_dataval); 44 45 /** Add a dependent span for a bytecode. 46 * \param add_span_data add_span_data passed into bc_calc_len() 47 * \param bc bytecode containing span 48 * \param id non-zero identifier for span; may be any non-zero value 49 * if <0, expand is called for any change; 50 * if >0, expand is only called when exceeds threshold 51 * \param value dependent value for bytecode expansion 52 * \param neg_thres negative threshold for long/short decision 53 * \param pos_thres positive threshold for long/short decision 54 */ 55 typedef void (*yasm_bc_add_span_func) 56 (void *add_span_data, yasm_bytecode *bc, int id, const yasm_value *value, 57 long neg_thres, long pos_thres); 58 59 /** Bytecode callback structure. Any implementation of a specific bytecode 60 * must implement these functions and this callback structure. The bytecode 61 * implementation-specific data is stored in #yasm_bytecode.contents. 62 */ 63 typedef struct yasm_bytecode_callback { 64 /** Destroys the implementation-specific data. 65 * Called from yasm_bc_destroy(). 66 * \param contents #yasm_bytecode.contents 67 */ 68 void (*destroy) (/*@only@*/ void *contents); 69 70 /** Prints the implementation-specific data (for debugging purposes). 71 * Called from yasm_bc_print(). 72 * \param contents #yasm_bytecode.contents 73 * \param f file 74 * \param indent_level indentation level 75 */ 76 void (*print) (const void *contents, FILE *f, int indent_level); 77 78 /** Finalizes the bytecode after parsing. Called from yasm_bc_finalize(). 79 * A generic fill-in for this is yasm_bc_finalize_common(). 80 * \param bc bytecode 81 * \param prev_bc bytecode directly preceding bc 82 */ 83 void (*finalize) (yasm_bytecode *bc, yasm_bytecode *prev_bc); 84 85 /** Return elements size of a data bytecode. 86 * This function should return the size of each elements of a data 87 * bytecode, for proper dereference of symbols attached to it. 88 * \param bc bytecode 89 * \return 0 if element size is unknown. 90 */ 91 int (*elem_size) (yasm_bytecode *bc); 92 93 /** Calculates the minimum size of a bytecode. 94 * Called from yasm_bc_calc_len(). 95 * A generic fill-in for this is yasm_bc_calc_len_common(), but as this 96 * function internal errors when called, be very careful when using it! 97 * This function should simply add to bc->len and not set it directly 98 * (it's initialized by yasm_bc_calc_len() prior to passing control to 99 * this function). 100 * 101 * \param bc bytecode 102 * \param add_span function to call to add a span 103 * \param add_span_data extra data to be passed to add_span function 104 * \return 0 if no error occurred, nonzero if there was an error 105 * recognized (and output) during execution. 106 * \note May store to bytecode updated expressions. 107 */ 108 int (*calc_len) (yasm_bytecode *bc, yasm_bc_add_span_func add_span, 109 void *add_span_data); 110 111 /** Recalculates the bytecode's length based on an expanded span length. 112 * Called from yasm_bc_expand(). 113 * A generic fill-in for this is yasm_bc_expand_common(), but as this 114 * function internal errors when called, if used, ensure that calc_len() 115 * never adds a span. 116 * This function should simply add to bc->len to increase the length by 117 * a delta amount. 118 * \param bc bytecode 119 * \param span span ID (as given to add_span in calc_len) 120 * \param old_val previous span value 121 * \param new_val new span value 122 * \param neg_thres negative threshold for long/short decision 123 * (returned) 124 * \param pos_thres positive threshold for long/short decision 125 * (returned) 126 * \return 0 if bc no longer dependent on this span's length, negative if 127 * there was an error recognized (and output) during execution, 128 * and positive if bc size may increase for this span further 129 * based on the new negative and positive thresholds returned. 130 * \note May store to bytecode updated expressions. 131 */ 132 int (*expand) (yasm_bytecode *bc, int span, long old_val, long new_val, 133 /*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres); 134 135 /** Convert a bytecode into its byte representation. 136 * Called from yasm_bc_tobytes(). 137 * A generic fill-in for this is yasm_bc_tobytes_common(), but as this 138 * function internal errors when called, be very careful when using it! 139 * \param bc bytecode 140 * \param bufp byte representation destination buffer; 141 * should be incremented as it's written to, 142 * so that on return its delta from the 143 * passed-in buf matches the bytecode length 144 * (it's okay not to do this if an error 145 * indication is returned) 146 * \param bufstart For calculating the correct offset parameter for 147 * the \a output_value calls: *bufp - bufstart. 148 * \param d data to pass to each call to 149 * output_value/output_reloc 150 * \param output_value function to call to convert values into their byte 151 * representation 152 * \param output_reloc function to call to output relocation entries 153 * for a single sym 154 * \return Nonzero on error, 0 on success. 155 * \note May result in non-reversible changes to the bytecode, but it's 156 * preferable if calling this function twice would result in the 157 * same output. 158 */ 159 int (*tobytes) (yasm_bytecode *bc, unsigned char **bufp, 160 unsigned char *bufstart, void *d, 161 yasm_output_value_func output_value, 162 /*@null@*/ yasm_output_reloc_func output_reloc); 163 164 /** Special bytecode classifications. Most bytecode types should use 165 * #YASM_BC_SPECIAL_NONE. Others cause special handling to kick in 166 * in various parts of yasm. 167 */ 168 enum yasm_bytecode_special_type { 169 YASM_BC_SPECIAL_NONE = 0, 170 171 /** Bytecode reserves space instead of outputting data. */ 172 YASM_BC_SPECIAL_RESERVE, 173 174 /** Adjusts offset instead of calculating len. */ 175 YASM_BC_SPECIAL_OFFSET, 176 177 /** Instruction bytecode. */ 178 YASM_BC_SPECIAL_INSN 179 } special; 180 } yasm_bytecode_callback; 181 182 /** A bytecode. */ 183 struct yasm_bytecode { 184 /** Bytecodes are stored as a singly linked list, with tail insertion. 185 * \see section.h (#yasm_section). 186 */ 187 /*@reldef@*/ STAILQ_ENTRY(yasm_bytecode) link; 188 189 /** The bytecode callback structure for this bytecode. May be NULL 190 * during partial initialization. 191 */ 192 /*@null@*/ const yasm_bytecode_callback *callback; 193 194 /** Pointer to section containing bytecode; NULL if not part of a 195 * section. 196 */ 197 /*@dependent@*/ /*@null@*/ yasm_section *section; 198 199 /** Number of times bytecode is repeated. 200 * NULL=1 (to save space in the common case). 201 */ 202 /*@only@*/ /*@null@*/ yasm_expr *multiple; 203 204 /** Total length of entire bytecode (not including multiple copies). */ 205 unsigned long len; 206 207 /** Number of copies, integer version. */ 208 long mult_int; 209 210 /** Line number where bytecode was defined. */ 211 unsigned long line; 212 213 /** Offset of bytecode from beginning of its section. 214 * 0-based, ~0UL (e.g. all 1 bits) if unknown. 215 */ 216 unsigned long offset; 217 218 /** Unique integer index of bytecode. Used during optimization. */ 219 unsigned long bc_index; 220 221 /** NULL-terminated array of labels that point to this bytecode (as the 222 * bytecode previous to the label). NULL if no labels point here. 223 */ 224 /*@null@*/ yasm_symrec **symrecs; 225 226 /** Implementation-specific data (type identified by callback). */ 227 void *contents; 228 }; 229 230 /** Create a bytecode of any specified type. 231 * \param callback bytecode callback functions, if NULL, creates empty 232 * bytecode (may not be resolved or output) 233 * \param contents type-specific data 234 * \param line virtual line (from yasm_linemap) 235 * \return Newly allocated bytecode of the specified type. 236 */ 237 YASM_LIB_DECL 238 /*@only@*/ yasm_bytecode *yasm_bc_create_common 239 (/*@null@*/ const yasm_bytecode_callback *callback, 240 /*@only@*/ /*@null@*/ void *contents, unsigned long line); 241 242 /** Transform a bytecode of any type into a different type. 243 * \param bc bytecode to transform 244 * \param callback new bytecode callback function 245 * \param contents new type-specific data 246 */ 247 YASM_LIB_DECL 248 void yasm_bc_transform(yasm_bytecode *bc, 249 const yasm_bytecode_callback *callback, 250 void *contents); 251 252 /** Common bytecode callback finalize function, for where no finalization 253 * is ever required for this type of bytecode. 254 */ 255 YASM_LIB_DECL 256 void yasm_bc_finalize_common(yasm_bytecode *bc, yasm_bytecode *prev_bc); 257 258 /** Common bytecode callback calc_len function, for where the bytecode has 259 * no calculatable length. Causes an internal error if called. 260 */ 261 YASM_LIB_DECL 262 int yasm_bc_calc_len_common(yasm_bytecode *bc, yasm_bc_add_span_func add_span, 263 void *add_span_data); 264 265 /** Common bytecode callback expand function, for where the bytecode is 266 * always short (calc_len never calls add_span). Causes an internal 267 * error if called. 268 */ 269 YASM_LIB_DECL 270 int yasm_bc_expand_common 271 (yasm_bytecode *bc, int span, long old_val, long new_val, 272 /*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres); 273 274 /** Common bytecode callback tobytes function, for where the bytecode 275 * cannot be converted to bytes. Causes an internal error if called. 276 */ 277 YASM_LIB_DECL 278 int yasm_bc_tobytes_common 279 (yasm_bytecode *bc, unsigned char **bufp, unsigned char *bufstart, void *d, 280 yasm_output_value_func output_value, 281 /*@null@*/ yasm_output_reloc_func output_reloc); 282 283 /** Get the next bytecode in a linked list of bytecodes. 284 * \param bc bytecode 285 * \return Next bytecode. 286 */ 287 #define yasm_bc__next(bc) STAILQ_NEXT(bc, link) 288 289 /** Set multiple field of a bytecode. 290 * A bytecode can be repeated a number of times when output. This function 291 * sets that multiple. 292 * \param bc bytecode 293 * \param e multiple (kept, do not free) 294 */ 295 YASM_LIB_DECL 296 void yasm_bc_set_multiple(yasm_bytecode *bc, /*@keep@*/ yasm_expr *e); 297 298 /** Create a bytecode containing data value(s). 299 * \param datahead list of data values (kept, do not free) 300 * \param size storage size (in bytes) for each data value 301 * \param append_zero append a single zero byte after each data value 302 * (if non-zero) 303 * \param arch architecture (optional); if provided, data items 304 * are directly simplified to bytes if possible 305 * \param line virtual line (from yasm_linemap) 306 * \return Newly allocated bytecode. 307 */ 308 YASM_LIB_DECL 309 /*@only@*/ yasm_bytecode *yasm_bc_create_data 310 (yasm_datavalhead *datahead, unsigned int size, int append_zero, 311 /*@null@*/ yasm_arch *arch, unsigned long line); 312 313 /** Create a bytecode containing LEB128-encoded data value(s). 314 * \param datahead list of data values (kept, do not free) 315 * \param sign signedness (1=signed, 0=unsigned) of each data value 316 * \param line virtual line (from yasm_linemap) 317 * \return Newly allocated bytecode. 318 */ 319 YASM_LIB_DECL 320 /*@only@*/ yasm_bytecode *yasm_bc_create_leb128 321 (yasm_datavalhead *datahead, int sign, unsigned long line); 322 323 /** Create a bytecode reserving space. 324 * \param numitems number of reserve "items" (kept, do not free) 325 * \param itemsize reserved size (in bytes) for each item 326 * \param line virtual line (from yasm_linemap) 327 * \return Newly allocated bytecode. 328 */ 329 YASM_LIB_DECL 330 /*@only@*/ yasm_bytecode *yasm_bc_create_reserve 331 (/*@only@*/ yasm_expr *numitems, unsigned int itemsize, 332 unsigned long line); 333 334 /** Get the number of items and itemsize for a reserve bytecode. If bc 335 * is not a reserve bytecode, returns NULL. 336 * \param bc bytecode 337 * \param itemsize reserved size (in bytes) for each item (returned) 338 * \return NULL if bc is not a reserve bytecode, otherwise an expression 339 * for the number of items to reserve. 340 */ 341 YASM_LIB_DECL 342 /*@null@*/ const yasm_expr *yasm_bc_reserve_numitems 343 (yasm_bytecode *bc, /*@out@*/ unsigned int *itemsize); 344 345 /** Create a bytecode that includes a binary file verbatim. 346 * \param filename path to binary file (kept, do not free) 347 * \param start starting location in file (in bytes) to read data from 348 * (kept, do not free); may be NULL to indicate 0 349 * \param maxlen maximum number of bytes to read from the file (kept, do 350 * do not free); may be NULL to indicate no maximum 351 * \param linemap line mapping repository 352 * \param line virtual line (from yasm_linemap) for the bytecode 353 * \return Newly allocated bytecode. 354 */ 355 YASM_LIB_DECL 356 /*@only@*/ yasm_bytecode *yasm_bc_create_incbin 357 (/*@only@*/ char *filename, /*@only@*/ /*@null@*/ yasm_expr *start, 358 /*@only@*/ /*@null@*/ yasm_expr *maxlen, yasm_linemap *linemap, 359 unsigned long line); 360 361 /** Create a bytecode that aligns the following bytecode to a boundary. 362 * \param boundary byte alignment (must be a power of two) 363 * \param fill fill data (if NULL, code_fill or 0 is used) 364 * \param maxskip maximum number of bytes to skip 365 * \param code_fill code fill data (if NULL, 0 is used) 366 * \param line virtual line (from yasm_linemap) 367 * \return Newly allocated bytecode. 368 * \note The precedence on generated fill is as follows: 369 * - from fill parameter (if not NULL) 370 * - from code_fill parameter (if not NULL) 371 * - 0 372 */ 373 YASM_LIB_DECL 374 /*@only@*/ yasm_bytecode *yasm_bc_create_align 375 (/*@keep@*/ yasm_expr *boundary, /*@keep@*/ /*@null@*/ yasm_expr *fill, 376 /*@keep@*/ /*@null@*/ yasm_expr *maxskip, 377 /*@null@*/ const unsigned char **code_fill, unsigned long line); 378 379 /** Create a bytecode that puts the following bytecode at a fixed section 380 * offset. 381 * \param start section offset of following bytecode 382 * \param fill fill value 383 * \param line virtual line (from yasm_linemap) 384 * \return Newly allocated bytecode. 385 */ 386 YASM_LIB_DECL 387 /*@only@*/ yasm_bytecode *yasm_bc_create_org 388 (unsigned long start, unsigned long fill, unsigned long line); 389 390 /** Get the section that contains a particular bytecode. 391 * \param bc bytecode 392 * \return Section containing bc (can be NULL if bytecode is not part of a 393 * section). 394 */ 395 YASM_LIB_DECL 396 /*@dependent@*/ /*@null@*/ yasm_section *yasm_bc_get_section 397 (yasm_bytecode *bc); 398 399 /** Add to the list of symrecs that reference a bytecode. For symrec use 400 * only. 401 * \param bc bytecode 402 * \param sym symbol 403 */ 404 YASM_LIB_DECL 405 void yasm_bc__add_symrec(yasm_bytecode *bc, /*@dependent@*/ yasm_symrec *sym); 406 407 /** Delete (free allocated memory for) a bytecode. 408 * \param bc bytecode (only pointer to it); may be NULL 409 */ 410 YASM_LIB_DECL 411 void yasm_bc_destroy(/*@only@*/ /*@null@*/ yasm_bytecode *bc); 412 413 /** Print a bytecode. For debugging purposes. 414 * \param f file 415 * \param indent_level indentation level 416 * \param bc bytecode 417 */ 418 YASM_LIB_DECL 419 void yasm_bc_print(const yasm_bytecode *bc, FILE *f, int indent_level); 420 421 /** Finalize a bytecode after parsing. 422 * \param bc bytecode 423 * \param prev_bc bytecode directly preceding bc in a list of bytecodes 424 */ 425 YASM_LIB_DECL 426 void yasm_bc_finalize(yasm_bytecode *bc, yasm_bytecode *prev_bc); 427 428 /** Determine the distance between the starting offsets of two bytecodes. 429 * \param precbc1 preceding bytecode to the first bytecode 430 * \param precbc2 preceding bytecode to the second bytecode 431 * \return Distance in bytes between the two bytecodes (bc2-bc1), or NULL if 432 * the distance was indeterminate. 433 * \warning Only valid /after/ optimization. 434 */ 435 YASM_LIB_DECL 436 /*@null@*/ /*@only@*/ yasm_intnum *yasm_calc_bc_dist 437 (yasm_bytecode *precbc1, yasm_bytecode *precbc2); 438 439 /** Get the offset of the next bytecode (the next bytecode doesn't have to 440 * actually exist). 441 * \param precbc preceding bytecode 442 * \return Offset of the next bytecode in bytes. 443 * \warning Only valid /after/ optimization. 444 */ 445 YASM_LIB_DECL 446 unsigned long yasm_bc_next_offset(yasm_bytecode *precbc); 447 448 /** Return elemens size of a data bytecode. 449 * Returns the size of each elements of a data bytecode, for proper dereference 450 * of symbols attached to it. 451 * \param bc bytecode 452 * \return 0 if element size is unknown 453 */ 454 YASM_LIB_DECL 455 int yasm_bc_elem_size(yasm_bytecode *bc); 456 457 /** Resolve EQUs in a bytecode and calculate its minimum size. 458 * Generates dependent bytecode spans for cases where, if the length spanned 459 * increases, it could cause the bytecode size to increase. 460 * Any bytecode multiple is NOT included in the length or spans generation; 461 * this must be handled at a higher level. 462 * \param bc bytecode 463 * \param add_span function to call to add a span 464 * \param add_span_data extra data to be passed to add_span function 465 * \return 0 if no error occurred, nonzero if there was an error recognized 466 * (and output) during execution. 467 * \note May store to bytecode updated expressions and the short length. 468 */ 469 YASM_LIB_DECL 470 int yasm_bc_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span, 471 void *add_span_data); 472 473 /** Recalculate a bytecode's length based on an expanded span length. 474 * \param bc bytecode 475 * \param span span ID (as given to yasm_bc_add_span_func in 476 * yasm_bc_calc_len) 477 * \param old_val previous span value 478 * \param new_val new span value 479 * \param neg_thres negative threshold for long/short decision (returned) 480 * \param pos_thres positive threshold for long/short decision (returned) 481 * \return 0 if bc no longer dependent on this span's length, negative if 482 * there was an error recognized (and output) during execution, and 483 * positive if bc size may increase for this span further based on the 484 * new negative and positive thresholds returned. 485 * \note May store to bytecode updated expressions and the updated length. 486 */ 487 YASM_LIB_DECL 488 int yasm_bc_expand(yasm_bytecode *bc, int span, long old_val, long new_val, 489 /*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres); 490 491 /** Convert a bytecode into its byte representation. 492 * \param bc bytecode 493 * \param buf byte representation destination buffer 494 * \param bufsize size of buf (in bytes) prior to call; size of the 495 * generated data after call 496 * \param gap if nonzero, indicates the data does not really need to 497 * exist in the object file; if nonzero, contents of buf 498 * are undefined [output] 499 * \param d data to pass to each call to output_value/output_reloc 500 * \param output_value function to call to convert values into their byte 501 * representation 502 * \param output_reloc function to call to output relocation entries 503 * for a single sym 504 * \return Newly allocated buffer that should be used instead of buf for 505 * reading the byte representation, or NULL if buf was big enough to 506 * hold the entire byte representation. 507 * \note Calling twice on the same bytecode may \em not produce the same 508 * results on the second call, as calling this function may result in 509 * non-reversible changes to the bytecode. 510 */ 511 YASM_LIB_DECL 512 /*@null@*/ /*@only@*/ unsigned char *yasm_bc_tobytes 513 (yasm_bytecode *bc, unsigned char *buf, unsigned long *bufsize, 514 /*@out@*/ int *gap, void *d, yasm_output_value_func output_value, 515 /*@null@*/ yasm_output_reloc_func output_reloc) 516 /*@sets *buf@*/; 517 518 /** Get the bytecode multiple value as an integer. 519 * \param bc bytecode 520 * \param multiple multiple value (output) 521 * \param calc_bc_dist nonzero if distances between bytecodes should be 522 * calculated, 0 if error should be returned in this case 523 * \return 1 on error (set with yasm_error_set), 0 on success. 524 */ 525 YASM_LIB_DECL 526 int yasm_bc_get_multiple(yasm_bytecode *bc, /*@out@*/ long *multiple, 527 int calc_bc_dist); 528 529 /** Get the bytecode multiple value as an expression. 530 * \param bc bytecode 531 * \return Bytecode multiple, NULL if =1. 532 */ 533 YASM_LIB_DECL 534 const yasm_expr *yasm_bc_get_multiple_expr(const yasm_bytecode *bc); 535 536 /** Get a #yasm_insn structure from an instruction bytecode (if possible). 537 * \param bc bytecode 538 * \return Instruction details if bytecode is an instruction bytecode, 539 * otherwise NULL. 540 */ 541 YASM_LIB_DECL 542 /*@dependent@*/ /*@null@*/ yasm_insn *yasm_bc_get_insn(yasm_bytecode *bc); 543 544 /** Create a new data value from an expression. 545 * \param expn expression 546 * \return Newly allocated data value. 547 */ 548 YASM_LIB_DECL 549 yasm_dataval *yasm_dv_create_expr(/*@keep@*/ yasm_expr *expn); 550 551 /** Create a new data value from a string. 552 * \param contents string (may contain NULs) 553 * \param len length of string 554 * \return Newly allocated data value. 555 */ 556 yasm_dataval *yasm_dv_create_string(/*@keep@*/ char *contents, size_t len); 557 558 /** Create a new data value from raw bytes data. 559 * \param contents raw data (may contain NULs) 560 * \param len length 561 * \return Newly allocated data value. 562 */ 563 YASM_LIB_DECL 564 yasm_dataval *yasm_dv_create_raw(/*@keep@*/ unsigned char *contents, 565 unsigned long len); 566 567 /** Create a new uninitialized data value. 568 * \return Newly allocated data value. 569 */ 570 yasm_dataval *yasm_dv_create_reserve(void); 571 572 #ifndef YASM_DOXYGEN 573 #define yasm_dv_create_string(s, l) yasm_dv_create_raw((unsigned char *)(s), \ 574 (unsigned long)(l)) 575 #endif 576 577 /** Get the underlying value of a data value. 578 * \param dv data value 579 * \return Value, or null if non-value (e.g. string or raw). 580 */ 581 yasm_value *yasm_dv_get_value(yasm_dataval *dv); 582 583 /** Set multiple field of a data value. 584 * A data value can be repeated a number of times when output. This function 585 * sets that multiple. 586 * \param dv data value 587 * \param e multiple (kept, do not free) 588 */ 589 void yasm_dv_set_multiple(yasm_dataval *dv, /*@keep@*/ yasm_expr *e); 590 591 /** Get the data value multiple value as an unsigned long integer. 592 * \param dv data value 593 * \param multiple multiple value (output) 594 * \return 1 on error (set with yasm_error_set), 0 on success. 595 */ 596 int yasm_dv_get_multiple(yasm_dataval *dv, /*@out@*/ unsigned long *multiple); 597 598 /** Initialize a list of data values. 599 * \param headp list of data values 600 */ 601 void yasm_dvs_initialize(yasm_datavalhead *headp); 602 #ifndef YASM_DOXYGEN 603 #define yasm_dvs_initialize(headp) STAILQ_INIT(headp) 604 #endif 605 606 /** Delete (free allocated memory for) a list of data values. 607 * \param headp list of data values 608 */ 609 YASM_LIB_DECL 610 void yasm_dvs_delete(yasm_datavalhead *headp); 611 612 /** Add data value to the end of a list of data values. 613 * \note Does not make a copy of the data value; so don't pass this function 614 * static or local variables, and discard the dv pointer after calling 615 * this function. 616 * \param headp data value list 617 * \param dv data value (may be NULL) 618 * \return If data value was actually appended (it wasn't NULL), the data 619 * value; otherwise NULL. 620 */ 621 YASM_LIB_DECL 622 /*@null@*/ yasm_dataval *yasm_dvs_append 623 (yasm_datavalhead *headp, /*@returned@*/ /*@null@*/ yasm_dataval *dv); 624 625 /** Print a data value list. For debugging purposes. 626 * \param f file 627 * \param indent_level indentation level 628 * \param headp data value list 629 */ 630 YASM_LIB_DECL 631 void yasm_dvs_print(const yasm_datavalhead *headp, FILE *f, int indent_level); 632 633 #endif 634
