libffi/include/ffi.h.in

   1 /* -----------------------------------------------------------------*-C-*-
   2    libffi @VERSION@ - Copyright (c) 1996-1999  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 ---------------- */
 193 #ifdef X86
 194   FFI_SYSV,
 195   FFI_DEFAULT_ABI = FFI_SYSV,
 196 #endif
 197
 198   /* ---- Intel ia64 ---------------- */
 199 #ifdef IA64
 200   FFI_UNIX,     /* Linux and all Unix variants use the same conventions */
 201   FFI_DEFAULT_ABI = FFI_UNIX,
 202 #endif
 203
 204   /* ---- Mips --------------------- */
 205 #ifdef MIPS
 206   FFI_O32,
 207   FFI_N32,
 208   FFI_N64,
 209 #endif
 210
 211   /* ---- Alpha -------------------- */
 212 #ifdef ALPHA
 213   FFI_OSF,
 214   FFI_DEFAULT_ABI = FFI_OSF,
 215 #endif
 216
 217   /* ---- Motorola m68k ------------ */
 218 #ifdef M68K
 219   FFI_SYSV,
 220   FFI_DEFAULT_ABI = FFI_SYSV,
 221 #endif
 222
 223   /* ---- PowerPC ------------------ */
 224 #ifdef POWERPC
 225   FFI_SYSV,
 226   FFI_GCC_SYSV,
 227   FFI_DEFAULT_ABI = FFI_GCC_SYSV,
 228 #endif
 229
 230   /* ---- ARM  --------------------- */
 231 #ifdef ARM
 232   FFI_SYSV,
 233   FFI_DEFAULT_ABI = FFI_SYSV,
 234 #endif
 235
 236   /* Leave this for debugging purposes */
 237   FFI_LAST_ABI
 238
 239 } ffi_abi;
 240
 241 typedef struct _ffi_type
 242 {
 243   size_t size;
 244   unsigned short alignment;
 245   unsigned short type;
 246   /*@null@*/ struct _ffi_type **elements;
 247 } ffi_type;
 248
 249 /* These are defined in ffi.c */
 250 extern ffi_type ffi_type_void;
 251 extern ffi_type ffi_type_uint8;
 252 extern ffi_type ffi_type_sint8;
 253 extern ffi_type ffi_type_uint16;
 254 extern ffi_type ffi_type_sint16;
 255 extern ffi_type ffi_type_uint32;
 256 extern ffi_type ffi_type_sint32;
 257 extern ffi_type ffi_type_uint64;
 258 extern ffi_type ffi_type_sint64;
 259 extern ffi_type ffi_type_float;
 260 extern ffi_type ffi_type_double;
 261 extern ffi_type ffi_type_longdouble;
 262 extern ffi_type ffi_type_pointer;
 263
 264 /* Characters are 8 bit integral types */
 265 #define ffi_type_schar ffi_type_sint8
 266 #define ffi_type_uchar ffi_type_uint8
 267
 268 typedef enum {
 269   FFI_OK = 0,
 270   FFI_BAD_TYPEDEF,
 271   FFI_BAD_ABI
 272 } ffi_status;
 273
 274 typedef unsigned FFI_TYPE;
 275
 276 typedef struct {
 277   ffi_abi abi;
 278   unsigned nargs;
 279   /*@dependent@*/ ffi_type **arg_types;
 280   /*@dependent@*/ ffi_type *rtype;
 281   unsigned bytes;
 282   unsigned flags;
 283
 284 #ifdef MIPS
 285 #if _MIPS_SIM == _ABIN32
 286   unsigned rstruct_flag;
 287 #endif
 288 #endif
 289
 290 } ffi_cif;
 291
 292 /* ---- Definitions for the raw API -------------------------------------- */
 293
 294 #if !FFI_NO_RAW_API
 295
 296 #if SIZEOF_ARG == 4
 297
 298 #define UINT_ARG UINT32
 299 #define SINT_ARG SINT32
 300
 301 #endif
 302
 303 #if SIZEOF_ARG == 8
 304
 305 #define UINT_ARG UINT64
 306 #define SINT_ARG SINT64
 307
 308 #endif
 309
 310 typedef union {
 311   SINT_ARG sint;
 312   UINT_ARG uint;
 313   float    flt;
 314   char     data[SIZEOF_ARG];
 315   void*    ptr;
 316 } ffi_raw;
 317
 318 void ffi_raw_call (/*@dependent@*/ ffi_cif *cif,
 319                    void (*fn)(),
 320                    /*@out@*/ void *rvalue,
 321                    /*@dependent@*/ ffi_raw *avalue);
 322
 323 void ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
 324 void ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
 325 size_t ffi_raw_size (ffi_cif *cif);
 326
 327 #if !NO_JAVA_RAW_API
 328
 329 /* This is analogous to the raw API, except it uses Java parameter      */
 330 /* packing, even on 64-bit machines.  I.e. on 64-bit machines           */
 331 /* longs and doubles are followed by an empty 64-bit word.              */
 332
 333 void ffi_java_raw_call (/*@dependent@*/ ffi_cif *cif,
 334                         void (*fn)(),
 335                         /*@out@*/ void *rvalue,
 336                         /*@dependent@*/ ffi_raw *avalue);
 337
 338 void ffi_java_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
 339 void ffi_java_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
 340 size_t ffi_java_raw_size (ffi_cif *cif);
 341
 342 #endif /* !NO_JAVA_RAW_API */
 343
 344 #endif /* !FFI_NO_RAW_API */
 345
 346 /* ---- Definitions for closures ----------------------------------------- */
 347
 348 #ifdef X86
 349
 350 #define FFI_CLOSURES 1          /* x86 supports closures */
 351 #define FFI_TRAMPOLINE_SIZE 10
 352 #define FFI_NATIVE_RAW_API 1    /* and has native raw api support */
 353
 354 #elif defined(IA64)
 355
 356 #define FFI_CLOSURES 1
 357 #define FFI_TRAMPOLINE_SIZE 24  /* Really the following struct, which   */
 358                                 /* can be interpreted as a C function   */
 359                                 /* decriptor:                           */
 360
 361 struct ffi_ia64_trampoline_struct {
 362     void * code_pointer;        /* Pointer to ffi_closure_UNIX  */
 363     void * fake_gp;             /* Pointer to closure, installed as gp  */
 364     void * real_gp;             /* Real gp value, reinstalled by        */
 365                                 /* ffi_closure_UNIX.                    */
 366 };
 367 #define FFI_NATIVE_RAW_API 0
 368
 369 #elif defined(ALPHA)
 370
 371 #define FFI_CLOSURES 1
 372 #define FFI_TRAMPOLINE_SIZE 24
 373 #define FFI_NATIVE_RAW_API 0
 374
 375 #else
 376
 377 #define FFI_CLOSURES 0
 378 #define FFI_NATIVE_RAW_API 0
 379
 380 #endif
 381
 382
 383
 384 #if FFI_CLOSURES
 385
 386 typedef struct {
 387   char tramp[FFI_TRAMPOLINE_SIZE];
 388   ffi_cif   *cif;
 389   void     (*fun)(ffi_cif*,void*,void**,void*);
 390   void      *user_data;
 391 } ffi_closure;
 392
 393 ffi_status
 394 ffi_prep_closure (ffi_closure*,
 395                   ffi_cif *,
 396                   void (*fun)(ffi_cif*,void*,void**,void*),
 397                   void *user_data);
 398
 399 #if !FFI_NO_RAW_API
 400
 401 typedef struct {
 402   char tramp[FFI_TRAMPOLINE_SIZE];
 403
 404   ffi_cif   *cif;
 405
 406 #if !FFI_NATIVE_RAW_API
 407
 408   /* if this is enabled, then a raw closure has the same layout
 409      as a regular closure.  We use this to install an intermediate
 410      handler to do the transaltion, void** -> ffi_raw*. */
 411
 412   void     (*translate_args)(ffi_cif*,void*,void**,void*);
 413   void      *this_closure;
 414
 415 #endif
 416
 417   void     (*fun)(ffi_cif*,void*,ffi_raw*,void*);
 418   void      *user_data;
 419
 420 } ffi_raw_closure;
 421
 422 ffi_status
 423 ffi_prep_raw_closure (ffi_raw_closure*,
 424                       ffi_cif *cif,
 425                       void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
 426                       void *user_data);
 427
 428 #ifndef NO_JAVA_RAW_API
 429 ffi_status
 430 ffi_prep_java_raw_closure (ffi_raw_closure*,
 431                            ffi_cif *cif,
 432                            void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
 433                            void *user_data);
 434 #endif
 435
 436 #endif /* !FFI_NO_RAW_API */
 437 #endif /* FFI_CLOSURES */
 438
 439 /* ---- Public interface definition -------------------------------------- */
 440
 441 ffi_status ffi_prep_cif(/*@out@*/ /*@partial@*/ ffi_cif *cif,
 442                         ffi_abi abi,
 443                         unsigned int nargs,
 444                         /*@dependent@*/ /*@out@*/ /*@partial@*/ ffi_type *rtype,
 445                         /*@dependent@*/ ffi_type **atypes);
 446
 447 void ffi_call(/*@dependent@*/ ffi_cif *cif,
 448               void (*fn)(),
 449               /*@out@*/ void *rvalue,
 450               /*@dependent@*/ void **avalue);
 451
 452 /* Useful for eliminating compiler warnings */
 453 #define FFI_FN(f) ((void (*)())f)
 454
 455 /* ---- Definitions shared with assembly code ---------------------------- */
 456
 457 #endif
 458
 459 #define FFI_TYPE_VOID       0
 460 #define FFI_TYPE_INT        1
 461 #define FFI_TYPE_FLOAT      2
 462 #define FFI_TYPE_DOUBLE     3
 463 #if SIZEOF_LONG_DOUBLE == SIZEOF_DOUBLE
 464 #define FFI_TYPE_LONGDOUBLE FFI_TYPE_DOUBLE
 465 #else
 466 #define FFI_TYPE_LONGDOUBLE 4
 467 #endif
 468
 469 #define FFI_TYPE_UINT8      5   /* If this changes, update ffi_mips.h. */
 470 #define FFI_TYPE_SINT8      6   /* If this changes, update ffi_mips.h. */
 471 #define FFI_TYPE_UINT16     7
 472 #define FFI_TYPE_SINT16     8
 473 #define FFI_TYPE_UINT32     9
 474 #define FFI_TYPE_SINT32     10
 475 #define FFI_TYPE_UINT64     11
 476 #define FFI_TYPE_SINT64     12
 477 #define FFI_TYPE_STRUCT     13  /* If this changes, update ffi_mips.h. */
 478 #define FFI_TYPE_POINTER    14
 479
 480 /* This should always refer to the last type code (for sanity checks) */
 481 #define FFI_TYPE_LAST       FFI_TYPE_POINTER
 482
 483 #ifdef __cplusplus
 484 }
 485 #endif
 486
 487 #endif
 488