libffi/include/ffi.h.in

   1 /* -----------------------------------------------------------------*-C-*-
   2    libffi @VERSION@ - Copyright (c) 1996-2003  Cygnus Solutions
   3
   4    Permission is hereby granted, free of charge, to any person obtaining
   5    a copy of this software and associated documentation files (the
   6    ``Software''), to deal in the Software without restriction, including
   7    without limitation the rights to use, copy, modify, merge, publish,
   8    distribute, sublicense, and/or sell copies of the Software, and to
   9    permit persons to whom the Software is furnished to do so, subject to
  10    the following conditions:
  11
  12    The above copyright notice and this permission notice shall be included
  13    in all copies or substantial portions of the Software.
  14
  15    THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18    IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19    OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21    OTHER DEALINGS IN THE SOFTWARE.
  22
  23    ----------------------------------------------------------------------- */
  24
  25 /* -------------------------------------------------------------------
  26    The basic API is described in the README file.
  27
  28    The raw API is designed to bypass some of the argument packing
  29    and unpacking on architectures for which it can be avoided.
  30
  31    The closure API allows interpreted functions to be packaged up
  32    inside a C function pointer, so that they can be called as C functions,
  33    with no understanding on the client side that they are interpreted.
  34    It can also be used in other cases in which it is necessary to package
  35    up a user specified parameter and a function pointer as a single
  36    function pointer.
  37
  38    The closure API must be implemented in order to get its functionality,
  39    e.g. for use by gij.  Routines are provided to emulate the raw API
  40    if the underlying platform doesn't allow faster implementation.
  41
  42    More details on the raw and cloure API can be found in:
  43
  44    http://gcc.gnu.org/ml/java/1999-q3/msg00138.html
  45
  46    and
  47
  48    http://gcc.gnu.org/ml/java/1999-q3/msg00174.html
  49    -------------------------------------------------------------------- */
  50
  51 #ifndef LIBFFI_H
  52 #define LIBFFI_H
  53
  54 #ifdef __cplusplus
  55 extern "C" {
  56 #endif
  57
  58 /* Specify which architecture libffi is configured for. */
  59 #define @TARGET@
  60
  61 /* ---- System configuration information --------------------------------- */
  62
  63 #include <fficonfig.h>
  64
  65 #if !defined(LIBFFI_ASM)
  66 #include <stddef.h>
  67 #if defined(FFI_DEBUG)
  68 #include <stdio.h>
  69 #endif
  70 #endif
  71
  72 /* ---- Generic type definitions ----------------------------------------- */
  73
  74 #define FLOAT32 float
  75 #define FLOAT64 double
  76 #define FLOAT80 long double
  77
  78 #define UINT8   unsigned char
  79 #define SINT8   signed char
  80
  81 #if SIZEOF_INT == 2
  82
  83 #define UINT16  unsigned int
  84 #define SINT16  int
  85 #define ffi_type_uint ffi_type_uint16
  86 #define ffi_type_sint ffi_type_sint16
  87
  88 #else
  89 #if SIZEOF_SHORT == 2
  90
  91 #define UINT16  unsigned short
  92 #define SINT16  short
  93 #define ffi_type_ushort ffi_type_uint16
  94 #define ffi_type_sshort ffi_type_sint16
  95
  96 #endif
  97 #endif
  98
  99 #if SIZEOF_INT == 4
 100
 101 #define UINT32  unsigned int
 102 #define SINT32  int
 103 #define ffi_type_uint ffi_type_uint32
 104 #define ffi_type_sint ffi_type_sint32
 105
 106 #else
 107 #if SIZEOF_SHORT == 4
 108
 109 #define UINT32  unsigned short
 110 #define SINT32  short
 111 #define ffi_type_ushort ffi_type_uint32
 112 #define ffi_type_sshort ffi_type_sint32
 113
 114 #else
 115 #if SIZEOF_LONG == 4
 116
 117 #define UINT32  unsigned long
 118 #define SINT32  long
 119 #define ffi_type_ulong ffi_type_uint32
 120 #define ffi_type_slong ffi_type_sint32
 121
 122 #endif
 123 #endif
 124 #endif
 125
 126 #if SIZEOF_INT == 8
 127
 128 #define UINT64  unsigned int
 129 #define SINT64  int
 130 #define ffi_type_uint ffi_type_uint64
 131 #define ffi_type_sint ffi_type_sint64
 132
 133 #else
 134 #if SIZEOF_LONG == 8
 135
 136 #define UINT64  unsigned long
 137 #define SINT64  long
 138 #define ffi_type_ulong ffi_type_uint64
 139 #define ffi_type_slong ffi_type_sint64
 140
 141 #else
 142 #if SIZEOF_LONG_LONG == 8
 143
 144 #define UINT64  unsigned long long
 145 #define SINT64  long long
 146 #define ffi_type_ulong ffi_type_uint64
 147 #define ffi_type_slong ffi_type_sint64
 148
 149 #endif
 150 #endif
 151 #endif
 152
 153 /* ---- System specific configurations ----------------------------------- */
 154
 155 #ifdef MIPS
 156 #include <ffi_mips.h>
 157 #else
 158 #define SIZEOF_ARG SIZEOF_VOID_P
 159 #endif
 160
 161 #ifdef SPARC
 162 #if defined(__arch64__) || defined(__sparcv9)
 163 #define SPARC64
 164 #endif
 165 #endif
 166
 167 #ifdef S390
 168 #if defined (__s390x__)
 169 #define S390X
 170 #endif
 171 #endif
 172
 173 #ifndef LIBFFI_ASM
 174
 175 /* ---- Generic type definitions ----------------------------------------- */
 176
 177 #define ALIGN(v, a)  (((((size_t) (v))-1) | ((a)-1))+1)
 178 /* The closure code assumes that this works on pointers, i.e. a size_t  */
 179 /* can hold a pointer.                                                  */
 180
 181 typedef enum ffi_abi {
 182
 183   /* Leave this for debugging purposes */
 184   FFI_FIRST_ABI = 0,
 185
 186   /* ---- Sparc -------------------- */
 187 #ifdef SPARC
 188   FFI_V8,
 189   FFI_V8PLUS,
 190   FFI_V9,
 191 #ifdef SPARC64
 192   FFI_DEFAULT_ABI = FFI_V9,
 193 #else
 194   FFI_DEFAULT_ABI = FFI_V8,
 195 #endif
 196 #endif
 197
 198   /* ---- Intel x86 Win32 ---------- */
 199 #ifdef X86_WIN32
 200   FFI_SYSV,
 201   FFI_STDCALL,
 202   /* TODO: Add fastcall support for the sake of completeness */
 203   FFI_DEFAULT_ABI = FFI_SYSV,
 204 #endif
 205
 206   /* ---- Intel x86 and AMD x86-64 - */
 207 #if !defined(X86_WIN32) && (defined(__i386__) || defined(__x86_64__))
 208   FFI_SYSV,
 209   FFI_UNIX64,   /* Unix variants all use the same ABI for x86-64  */
 210 #ifdef __i386__
 211   FFI_DEFAULT_ABI = FFI_SYSV,
 212 #else
 213   FFI_DEFAULT_ABI = FFI_UNIX64,
 214 #endif
 215 #endif
 216
 217   /* ---- Intel ia64 ---------------- */
 218 #ifdef IA64
 219   FFI_UNIX,     /* Linux and all Unix variants use the same conventions */
 220   FFI_DEFAULT_ABI = FFI_UNIX,
 221 #endif
 222
 223   /* ---- Mips --------------------- */
 224 #ifdef MIPS
 225   FFI_O32,
 226   FFI_N32,
 227   FFI_N64,
 228 #endif
 229
 230   /* ---- Alpha -------------------- */
 231 #ifdef ALPHA
 232   FFI_OSF,
 233   FFI_DEFAULT_ABI = FFI_OSF,
 234 #endif
 235
 236   /* ---- Motorola m68k ------------ */
 237 #ifdef M68K
 238   FFI_SYSV,
 239   FFI_DEFAULT_ABI = FFI_SYSV,
 240 #endif
 241
 242   /* ---- PowerPC ------------------ */
 243 #ifdef POWERPC
 244   FFI_SYSV,
 245   FFI_GCC_SYSV,
 246   FFI_DEFAULT_ABI = FFI_GCC_SYSV,
 247 #endif
 248
 249 #ifdef POWERPC_AIX
 250   FFI_AIX,
 251   FFI_DARWIN,
 252   FFI_DEFAULT_ABI = FFI_AIX,
 253 #endif
 254
 255 #ifdef POWERPC_DARWIN
 256   FFI_AIX,
 257   FFI_DARWIN,
 258   FFI_DEFAULT_ABI = FFI_DARWIN,
 259 #endif
 260
 261   /* ---- ARM  --------------------- */
 262 #ifdef ARM
 263   FFI_SYSV,
 264   FFI_DEFAULT_ABI = FFI_SYSV,
 265 #endif
 266
 267   /* ---- S390 --------------------- */
 268 #ifdef S390
 269   FFI_SYSV,
 270   FFI_DEFAULT_ABI = FFI_SYSV,
 271 #endif
 272
 273   /* ---- SuperH ------------------- */
 274 #ifdef SH
 275   FFI_SYSV,
 276   FFI_DEFAULT_ABI = FFI_SYSV,
 277 #endif
 278
 279   /* Leave this for debugging purposes */
 280   FFI_LAST_ABI
 281
 282 } ffi_abi;
 283
 284 typedef struct _ffi_type
 285 {
 286   size_t size;
 287   unsigned short alignment;
 288   unsigned short type;
 289   /*@null@*/ struct _ffi_type **elements;
 290 } ffi_type;
 291
 292 /* These are defined in types.c */
 293 extern ffi_type ffi_type_void;
 294 extern ffi_type ffi_type_uint8;
 295 extern ffi_type ffi_type_sint8;
 296 extern ffi_type ffi_type_uint16;
 297 extern ffi_type ffi_type_sint16;
 298 extern ffi_type ffi_type_uint32;
 299 extern ffi_type ffi_type_sint32;
 300 extern ffi_type ffi_type_uint64;
 301 extern ffi_type ffi_type_sint64;
 302 extern ffi_type ffi_type_float;
 303 extern ffi_type ffi_type_double;
 304 extern ffi_type ffi_type_longdouble;
 305 extern ffi_type ffi_type_pointer;
 306
 307 /* Characters are 8 bit integral types */
 308 #define ffi_type_schar ffi_type_sint8
 309 #define ffi_type_uchar ffi_type_uint8
 310
 311 typedef enum {
 312   FFI_OK = 0,
 313   FFI_BAD_TYPEDEF,
 314   FFI_BAD_ABI
 315 } ffi_status;
 316
 317 typedef unsigned FFI_TYPE;
 318
 319 typedef struct {
 320   ffi_abi abi;
 321   unsigned nargs;
 322   /*@dependent@*/ ffi_type **arg_types;
 323   /*@dependent@*/ ffi_type *rtype;
 324   unsigned bytes;
 325   unsigned flags;
 326
 327 #ifdef MIPS
 328 #if _MIPS_SIM == _ABIN32
 329   unsigned rstruct_flag;
 330 #endif
 331 #endif
 332
 333 } ffi_cif;
 334
 335 #if SIZEOF_ARG == 4
 336 typedef UINT32 ffi_arg;
 337 #else
 338 #if SIZEOF_ARG == 8
 339 typedef UINT64 ffi_arg;
 340 #else
 341 -- unsupported configuration
 342 #endif
 343 #endif
 344
 345 /* ---- Definitions for the raw API -------------------------------------- */
 346
 347 #if !FFI_NO_RAW_API
 348
 349 #if SIZEOF_ARG == 4
 350
 351 #define UINT_ARG UINT32
 352 #define SINT_ARG SINT32
 353
 354 #endif
 355
 356 #if SIZEOF_ARG == 8
 357
 358 #define UINT_ARG UINT64
 359 #define SINT_ARG SINT64
 360
 361 #endif
 362
 363 typedef union {
 364   SINT_ARG sint;
 365   UINT_ARG uint;
 366   float    flt;
 367   char     data[SIZEOF_ARG];
 368   void*    ptr;
 369 } ffi_raw;
 370
 371 void ffi_raw_call (/*@dependent@*/ ffi_cif *cif,
 372                    void (*fn)(),
 373                    /*@out@*/ void *rvalue,
 374                    /*@dependent@*/ ffi_raw *avalue);
 375
 376 void ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
 377 void ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
 378 size_t ffi_raw_size (ffi_cif *cif);
 379
 380 #if !NO_JAVA_RAW_API
 381
 382 /* This is analogous to the raw API, except it uses Java parameter      */
 383 /* packing, even on 64-bit machines.  I.e. on 64-bit machines           */
 384 /* longs and doubles are followed by an empty 64-bit word.              */
 385
 386 void ffi_java_raw_call (/*@dependent@*/ ffi_cif *cif,
 387                         void (*fn)(),
 388                         /*@out@*/ void *rvalue,
 389                         /*@dependent@*/ ffi_raw *avalue);
 390
 391 void ffi_java_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
 392 void ffi_java_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
 393 size_t ffi_java_raw_size (ffi_cif *cif);
 394
 395 #endif /* !NO_JAVA_RAW_API */
 396
 397 #endif /* !FFI_NO_RAW_API */
 398
 399 /* ---- Definitions for closures ----------------------------------------- */
 400
 401 #ifdef __i386__
 402
 403 #define FFI_CLOSURES 1          /* x86 supports closures */
 404 #define FFI_TRAMPOLINE_SIZE 10
 405 #define FFI_NATIVE_RAW_API 1    /* and has native raw api support */
 406
 407 #elif defined(IA64)
 408
 409 #define FFI_CLOSURES 1
 410 #define FFI_TRAMPOLINE_SIZE 24  /* Really the following struct, which   */
 411                                 /* can be interpreted as a C function   */
 412                                 /* decriptor:                           */
 413
 414 struct ffi_ia64_trampoline_struct {
 415     void * code_pointer;        /* Pointer to ffi_closure_UNIX  */
 416     void * fake_gp;             /* Pointer to closure, installed as gp  */
 417     void * real_gp;             /* Real gp value, reinstalled by        */
 418                                 /* ffi_closure_UNIX.                    */
 419 };
 420 #define FFI_NATIVE_RAW_API 0
 421
 422 #elif defined(ALPHA)
 423
 424 #define FFI_CLOSURES 1
 425 #define FFI_TRAMPOLINE_SIZE 24
 426 #define FFI_NATIVE_RAW_API 0
 427
 428 #elif defined(POWERPC)
 429
 430 #define FFI_CLOSURES 1
 431 #define FFI_TRAMPOLINE_SIZE 40
 432 #define FFI_NATIVE_RAW_API 0
 433
 434 #elif defined(POWERPC_DARWIN)
 435
 436 #define FFI_CLOSURES 1
 437 #define FFI_TRAMPOLINE_SIZE 40
 438 #define FFI_NATIVE_RAW_API 0
 439
 440 #elif defined(POWERPC_AIX)
 441
 442 #define FFI_CLOSURES 1
 443 #define FFI_TRAMPOLINE_SIZE 24 /* see struct below */
 444 #define FFI_NATIVE_RAW_API 0
 445
 446 #elif defined(SPARC64)
 447
 448 #define FFI_CLOSURES 1
 449 #define FFI_TRAMPOLINE_SIZE 24
 450 #define FFI_NATIVE_RAW_API 0
 451
 452 #elif defined(SPARC)
 453
 454 #define FFI_CLOSURES 1
 455 #define FFI_TRAMPOLINE_SIZE 16
 456 #define FFI_NATIVE_RAW_API 0
 457
 458 #elif defined(S390)
 459
 460 #define FFI_CLOSURES 1
 461 #ifdef S390X
 462 #define FFI_TRAMPOLINE_SIZE 32
 463 #else
 464 #define FFI_TRAMPOLINE_SIZE 16
 465 #endif
 466 #define FFI_NATIVE_RAW_API 0
 467
 468 #elif defined(SH)
 469
 470 #define FFI_CLOSURES 1
 471 #define FFI_TRAMPOLINE_SIZE 16
 472 #define FFI_NATIVE_RAW_API 0
 473
 474 #elif defined(__x86_64__)
 475
 476 #define FFI_CLOSURES 1
 477 #define FFI_TRAMPOLINE_SIZE 24
 478 #define FFI_NATIVE_RAW_API 0
 479
 480 #else
 481
 482 #define FFI_CLOSURES 0
 483 #define FFI_NATIVE_RAW_API 0
 484
 485 #endif
 486
 487 #if defined(POWERPC_DARWIN) || defined(POWERPC_AIX)
 488
 489 struct ffi_aix_trampoline_struct {
 490     void * code_pointer;        /* Pointer to ffi_closure_ASM */
 491     void * toc;                 /* TOC */
 492     void * static_chain;        /* Pointer to closure */
 493 };
 494
 495 #endif
 496
 497
 498
 499 #if FFI_CLOSURES
 500
 501 typedef struct {
 502   char tramp[FFI_TRAMPOLINE_SIZE];
 503   ffi_cif   *cif;
 504   void     (*fun)(ffi_cif*,void*,void**,void*);
 505   void      *user_data;
 506 } ffi_closure;
 507
 508 ffi_status
 509 ffi_prep_closure (ffi_closure*,
 510                   ffi_cif *,
 511                   void (*fun)(ffi_cif*,void*,void**,void*),
 512                   void *user_data);
 513
 514 #if !FFI_NO_RAW_API
 515
 516 typedef struct {
 517   char tramp[FFI_TRAMPOLINE_SIZE];
 518
 519   ffi_cif   *cif;
 520
 521 #if !FFI_NATIVE_RAW_API
 522
 523   /* if this is enabled, then a raw closure has the same layout
 524      as a regular closure.  We use this to install an intermediate
 525      handler to do the transaltion, void** -> ffi_raw*. */
 526
 527   void     (*translate_args)(ffi_cif*,void*,void**,void*);
 528   void      *this_closure;
 529
 530 #endif
 531
 532   void     (*fun)(ffi_cif*,void*,ffi_raw*,void*);
 533   void      *user_data;
 534
 535 } ffi_raw_closure;
 536
 537 ffi_status
 538 ffi_prep_raw_closure (ffi_raw_closure*,
 539                       ffi_cif *cif,
 540                       void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
 541                       void *user_data);
 542
 543 #ifndef NO_JAVA_RAW_API
 544 ffi_status
 545 ffi_prep_java_raw_closure (ffi_raw_closure*,
 546                            ffi_cif *cif,
 547                            void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
 548                            void *user_data);
 549 #endif
 550
 551 #endif /* !FFI_NO_RAW_API */
 552 #endif /* FFI_CLOSURES */
 553
 554 /* ---- Public interface definition -------------------------------------- */
 555
 556 ffi_status ffi_prep_cif(/*@out@*/ /*@partial@*/ ffi_cif *cif,
 557                         ffi_abi abi,
 558                         unsigned int nargs,
 559                         /*@dependent@*/ /*@out@*/ /*@partial@*/ ffi_type *rtype,
 560                         /*@dependent@*/ ffi_type **atypes);
 561
 562 void ffi_call(/*@dependent@*/ ffi_cif *cif,
 563               void (*fn)(),
 564               /*@out@*/ void *rvalue,
 565               /*@dependent@*/ void **avalue);
 566
 567 /* Useful for eliminating compiler warnings */
 568 #define FFI_FN(f) ((void (*)())f)
 569
 570 /* ---- Definitions shared with assembly code ---------------------------- */
 571
 572 #endif
 573
 574 #define FFI_TYPE_VOID       0
 575 #define FFI_TYPE_INT        1
 576 #define FFI_TYPE_FLOAT      2
 577 #define FFI_TYPE_DOUBLE     3
 578 #if SIZEOF_LONG_DOUBLE == SIZEOF_DOUBLE
 579 #define FFI_TYPE_LONGDOUBLE FFI_TYPE_DOUBLE
 580 #else
 581 #define FFI_TYPE_LONGDOUBLE 4
 582 #endif
 583
 584 #define FFI_TYPE_UINT8      5   /* If this changes, update ffi_mips.h. */
 585 #define FFI_TYPE_SINT8      6   /* If this changes, update ffi_mips.h. */
 586 #define FFI_TYPE_UINT16     7
 587 #define FFI_TYPE_SINT16     8
 588 #define FFI_TYPE_UINT32     9
 589 #define FFI_TYPE_SINT32     10
 590 #define FFI_TYPE_UINT64     11
 591 #define FFI_TYPE_SINT64     12
 592 #define FFI_TYPE_STRUCT     13  /* If this changes, update ffi_mips.h. */
 593 #define FFI_TYPE_POINTER    14
 594
 595 /* This should always refer to the last type code (for sanity checks) */
 596 #define FFI_TYPE_LAST       FFI_TYPE_POINTER
 597
 598 #ifdef __cplusplus
 599 }
 600 #endif
 601
 602 #endif
 603