libffi/include/ffi.h.in

   1 /* -----------------------------------------------------------------*-C-*-
   2    libffi @VERSION@ - Copyright (c) 1996-2002  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 #ifndef LIBFFI_ASM
 168
 169 /* ---- Generic type definitions ----------------------------------------- */
 170
 171 #define ALIGN(v, a)  (((((size_t) (v))-1) | ((a)-1))+1)
 172 /* The closure code assumes that this works on pointers, i.e. a size_t  */
 173 /* can hold a pointer.                                                  */
 174
 175 typedef enum ffi_abi {
 176
 177   /* Leave this for debugging purposes */
 178   FFI_FIRST_ABI = 0,
 179
 180   /* ---- Sparc -------------------- */
 181 #ifdef SPARC
 182   FFI_V8,
 183   FFI_V8PLUS,
 184   FFI_V9,
 185 #ifdef SPARC64
 186   FFI_DEFAULT_ABI = FFI_V9,
 187 #else
 188   FFI_DEFAULT_ABI = FFI_V8,
 189 #endif
 190 #endif
 191
 192   /* ---- Intel x86 and AMD x86-64 - */
 193 #if defined(X86) || defined(X86_64)
 194   FFI_SYSV,
 195   FFI_UNIX64,   /* Unix variants all use the same ABI for x86-64  */
 196 #ifdef X86
 197   FFI_DEFAULT_ABI = FFI_SYSV,
 198 #else
 199   FFI_DEFAULT_ABI = FFI_UNIX64,
 200 #endif
 201 #endif
 202
 203   /* ---- Intel x86 Win32 ---------- */
 204 #ifdef X86_WIN32
 205   FFI_SYSV,
 206   FFI_DEFAULT_ABI = FFI_SYSV,
 207 #endif
 208
 209   /* ---- Intel ia64 ---------------- */
 210 #ifdef IA64
 211   FFI_UNIX,     /* Linux and all Unix variants use the same conventions */
 212   FFI_DEFAULT_ABI = FFI_UNIX,
 213 #endif
 214
 215   /* ---- Mips --------------------- */
 216 #ifdef MIPS
 217   FFI_O32,
 218   FFI_N32,
 219   FFI_N64,
 220 #endif
 221
 222   /* ---- Alpha -------------------- */
 223 #ifdef ALPHA
 224   FFI_OSF,
 225   FFI_DEFAULT_ABI = FFI_OSF,
 226 #endif
 227
 228   /* ---- Motorola m68k ------------ */
 229 #ifdef M68K
 230   FFI_SYSV,
 231   FFI_DEFAULT_ABI = FFI_SYSV,
 232 #endif
 233
 234   /* ---- PowerPC ------------------ */
 235 #ifdef POWERPC
 236   FFI_SYSV,
 237   FFI_GCC_SYSV,
 238   FFI_DEFAULT_ABI = FFI_GCC_SYSV,
 239 #endif
 240
 241 #ifdef POWERPC_AIX
 242   FFI_AIX,
 243   FFI_DARWIN,
 244   FFI_DEFAULT_ABI = FFI_AIX,
 245 #endif
 246
 247 #ifdef POWERPC_DARWIN
 248   FFI_AIX,
 249   FFI_DARWIN,
 250   FFI_DEFAULT_ABI = FFI_DARWIN,
 251 #endif
 252
 253   /* ---- ARM  --------------------- */
 254 #ifdef ARM
 255   FFI_SYSV,
 256   FFI_DEFAULT_ABI = FFI_SYSV,
 257 #endif
 258
 259   /* ---- S390 --------------------- */
 260 #ifdef S390
 261   FFI_SYSV,
 262   FFI_DEFAULT_ABI = FFI_SYSV,
 263 #endif
 264
 265   /* ---- SuperH ------------------- */
 266 #ifdef SH
 267   FFI_SYSV,
 268   FFI_DEFAULT_ABI = FFI_SYSV,
 269 #endif
 270
 271   /* Leave this for debugging purposes */
 272   FFI_LAST_ABI
 273
 274 } ffi_abi;
 275
 276 typedef struct _ffi_type
 277 {
 278   size_t size;
 279   unsigned short alignment;
 280   unsigned short type;
 281   /*@null@*/ struct _ffi_type **elements;
 282 } ffi_type;
 283
 284 /* These are defined in ffi.c */
 285 extern ffi_type ffi_type_void;
 286 extern ffi_type ffi_type_uint8;
 287 extern ffi_type ffi_type_sint8;
 288 extern ffi_type ffi_type_uint16;
 289 extern ffi_type ffi_type_sint16;
 290 extern ffi_type ffi_type_uint32;
 291 extern ffi_type ffi_type_sint32;
 292 extern ffi_type ffi_type_uint64;
 293 extern ffi_type ffi_type_sint64;
 294 extern ffi_type ffi_type_float;
 295 extern ffi_type ffi_type_double;
 296 extern ffi_type ffi_type_longdouble;
 297 extern ffi_type ffi_type_pointer;
 298
 299 /* Characters are 8 bit integral types */
 300 #define ffi_type_schar ffi_type_sint8
 301 #define ffi_type_uchar ffi_type_uint8
 302
 303 typedef enum {
 304   FFI_OK = 0,
 305   FFI_BAD_TYPEDEF,
 306   FFI_BAD_ABI
 307 } ffi_status;
 308
 309 typedef unsigned FFI_TYPE;
 310
 311 typedef struct {
 312   ffi_abi abi;
 313   unsigned nargs;
 314   /*@dependent@*/ ffi_type **arg_types;
 315   /*@dependent@*/ ffi_type *rtype;
 316   unsigned bytes;
 317   unsigned flags;
 318
 319 #ifdef MIPS
 320 #if _MIPS_SIM == _ABIN32
 321   unsigned rstruct_flag;
 322 #endif
 323 #endif
 324
 325 } ffi_cif;
 326
 327 #if SIZEOF_ARG == 4
 328 typedef UINT32 ffi_arg;
 329 #else
 330 #if SIZEOF_ARG == 8
 331 typedef UINT64 ffi_arg;
 332 #else
 333 -- unsupported configuration
 334 #endif
 335 #endif
 336
 337 /* ---- Definitions for the raw API -------------------------------------- */
 338
 339 #if !FFI_NO_RAW_API
 340
 341 #if SIZEOF_ARG == 4
 342
 343 #define UINT_ARG UINT32
 344 #define SINT_ARG SINT32
 345
 346 #endif
 347
 348 #if SIZEOF_ARG == 8
 349
 350 #define UINT_ARG UINT64
 351 #define SINT_ARG SINT64
 352
 353 #endif
 354
 355 typedef union {
 356   SINT_ARG sint;
 357   UINT_ARG uint;
 358   float    flt;
 359   char     data[SIZEOF_ARG];
 360   void*    ptr;
 361 } ffi_raw;
 362
 363 void ffi_raw_call (/*@dependent@*/ ffi_cif *cif,
 364                    void (*fn)(),
 365                    /*@out@*/ void *rvalue,
 366                    /*@dependent@*/ ffi_raw *avalue);
 367
 368 void ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
 369 void ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
 370 size_t ffi_raw_size (ffi_cif *cif);
 371
 372 #if !NO_JAVA_RAW_API
 373
 374 /* This is analogous to the raw API, except it uses Java parameter      */
 375 /* packing, even on 64-bit machines.  I.e. on 64-bit machines           */
 376 /* longs and doubles are followed by an empty 64-bit word.              */
 377
 378 void ffi_java_raw_call (/*@dependent@*/ ffi_cif *cif,
 379                         void (*fn)(),
 380                         /*@out@*/ void *rvalue,
 381                         /*@dependent@*/ ffi_raw *avalue);
 382
 383 void ffi_java_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
 384 void ffi_java_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
 385 size_t ffi_java_raw_size (ffi_cif *cif);
 386
 387 #endif /* !NO_JAVA_RAW_API */
 388
 389 #endif /* !FFI_NO_RAW_API */
 390
 391 /* ---- Definitions for closures ----------------------------------------- */
 392
 393 #ifdef X86
 394
 395 #define FFI_CLOSURES 1          /* x86 supports closures */
 396 #define FFI_TRAMPOLINE_SIZE 10
 397 #define FFI_NATIVE_RAW_API 1    /* and has native raw api support */
 398
 399 #elif defined(X86_WIN32)
 400
 401 #define FFI_CLOSURES 1          /* x86 supports closures */
 402 #define FFI_TRAMPOLINE_SIZE 10
 403 #define FFI_NATIVE_RAW_API 1    /* and has native raw api support */
 404
 405 #elif defined(IA64)
 406
 407 #define FFI_CLOSURES 1
 408 #define FFI_TRAMPOLINE_SIZE 24  /* Really the following struct, which   */
 409                                 /* can be interpreted as a C function   */
 410                                 /* decriptor:                           */
 411
 412 struct ffi_ia64_trampoline_struct {
 413     void * code_pointer;        /* Pointer to ffi_closure_UNIX  */
 414     void * fake_gp;             /* Pointer to closure, installed as gp  */
 415     void * real_gp;             /* Real gp value, reinstalled by        */
 416                                 /* ffi_closure_UNIX.                    */
 417 };
 418 #define FFI_NATIVE_RAW_API 0
 419
 420 #elif defined(ALPHA)
 421
 422 #define FFI_CLOSURES 1
 423 #define FFI_TRAMPOLINE_SIZE 24
 424 #define FFI_NATIVE_RAW_API 0
 425
 426 #elif defined(POWERPC)
 427
 428 #define FFI_CLOSURES 1
 429 #define FFI_TRAMPOLINE_SIZE 40
 430 #define FFI_NATIVE_RAW_API 0
 431
 432 #elif defined(POWERPC_DARWIN)
 433
 434 #define FFI_CLOSURES 1
 435 #define FFI_TRAMPOLINE_SIZE 40
 436 #define FFI_NATIVE_RAW_API 0
 437
 438 #elif defined(POWERPC_AIX)
 439
 440 #define FFI_CLOSURES 1
 441 #define FFI_TRAMPOLINE_SIZE 24 /* see struct below */
 442 #define FFI_NATIVE_RAW_API 0
 443
 444 #elif defined(SH)
 445
 446 #define FFI_CLOSURES 1
 447 #define FFI_TRAMPOLINE_SIZE 16
 448 #define FFI_NATIVE_RAW_API 0
 449
 450 #else
 451
 452 #define FFI_CLOSURES 0
 453 #define FFI_NATIVE_RAW_API 0
 454
 455 #endif
 456
 457 #if defined(POWERPC_DARWIN) || defined(POWERPC_AIX)
 458
 459 struct ffi_aix_trampoline_struct {
 460     void * code_pointer;        /* Pointer to ffi_closure_ASM */
 461     void * toc;                 /* TOC */
 462     void * static_chain;        /* Pointer to closure */
 463 };
 464
 465 #endif
 466
 467
 468
 469 #if FFI_CLOSURES
 470
 471 typedef struct {
 472   char tramp[FFI_TRAMPOLINE_SIZE];
 473   ffi_cif   *cif;
 474   void     (*fun)(ffi_cif*,void*,void**,void*);
 475   void      *user_data;
 476 } ffi_closure;
 477
 478 ffi_status
 479 ffi_prep_closure (ffi_closure*,
 480                   ffi_cif *,
 481                   void (*fun)(ffi_cif*,void*,void**,void*),
 482                   void *user_data);
 483
 484 #if !FFI_NO_RAW_API
 485
 486 typedef struct {
 487   char tramp[FFI_TRAMPOLINE_SIZE];
 488
 489   ffi_cif   *cif;
 490
 491 #if !FFI_NATIVE_RAW_API
 492
 493   /* if this is enabled, then a raw closure has the same layout
 494      as a regular closure.  We use this to install an intermediate
 495      handler to do the transaltion, void** -> ffi_raw*. */
 496
 497   void     (*translate_args)(ffi_cif*,void*,void**,void*);
 498   void      *this_closure;
 499
 500 #endif
 501
 502   void     (*fun)(ffi_cif*,void*,ffi_raw*,void*);
 503   void      *user_data;
 504
 505 } ffi_raw_closure;
 506
 507 ffi_status
 508 ffi_prep_raw_closure (ffi_raw_closure*,
 509                       ffi_cif *cif,
 510                       void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
 511                       void *user_data);
 512
 513 #ifndef NO_JAVA_RAW_API
 514 ffi_status
 515 ffi_prep_java_raw_closure (ffi_raw_closure*,
 516                            ffi_cif *cif,
 517                            void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
 518                            void *user_data);
 519 #endif
 520
 521 #endif /* !FFI_NO_RAW_API */
 522 #endif /* FFI_CLOSURES */
 523
 524 /* ---- Public interface definition -------------------------------------- */
 525
 526 ffi_status ffi_prep_cif(/*@out@*/ /*@partial@*/ ffi_cif *cif,
 527                         ffi_abi abi,
 528                         unsigned int nargs,
 529                         /*@dependent@*/ /*@out@*/ /*@partial@*/ ffi_type *rtype,
 530                         /*@dependent@*/ ffi_type **atypes);
 531
 532 void ffi_call(/*@dependent@*/ ffi_cif *cif,
 533               void (*fn)(),
 534               /*@out@*/ void *rvalue,
 535               /*@dependent@*/ void **avalue);
 536
 537 /* Useful for eliminating compiler warnings */
 538 #define FFI_FN(f) ((void (*)())f)
 539
 540 /* ---- Definitions shared with assembly code ---------------------------- */
 541
 542 #endif
 543
 544 #define FFI_TYPE_VOID       0
 545 #define FFI_TYPE_INT        1
 546 #define FFI_TYPE_FLOAT      2
 547 #define FFI_TYPE_DOUBLE     3
 548 #if SIZEOF_LONG_DOUBLE == SIZEOF_DOUBLE
 549 #define FFI_TYPE_LONGDOUBLE FFI_TYPE_DOUBLE
 550 #else
 551 #define FFI_TYPE_LONGDOUBLE 4
 552 #endif
 553
 554 #define FFI_TYPE_UINT8      5   /* If this changes, update ffi_mips.h. */
 555 #define FFI_TYPE_SINT8      6   /* If this changes, update ffi_mips.h. */
 556 #define FFI_TYPE_UINT16     7
 557 #define FFI_TYPE_SINT16     8
 558 #define FFI_TYPE_UINT32     9
 559 #define FFI_TYPE_SINT32     10
 560 #define FFI_TYPE_UINT64     11
 561 #define FFI_TYPE_SINT64     12
 562 #define FFI_TYPE_STRUCT     13  /* If this changes, update ffi_mips.h. */
 563 #define FFI_TYPE_POINTER    14
 564
 565 /* This should always refer to the last type code (for sanity checks) */
 566 #define FFI_TYPE_LAST       FFI_TYPE_POINTER
 567
 568 #ifdef __cplusplus
 569 }
 570 #endif
 571
 572 #endif
 573