path: root/Modules/_ctypes/libffi/include/ffi.h.in

/* -----------------------------------------------------------------*-C-*-
   libffi @VERSION@ - Copyright (c) 2011 Anthony Green
                    - Copyright (c) 1996-2003, 2007, 2008 Red Hat, Inc.

   Permission is hereby granted, free of charge, to any person
   obtaining a copy of this software and associated documentation
   files (the ``Software''), to deal in the Software without
   restriction, including without limitation the rights to use, copy,
   modify, merge, publish, distribute, sublicense, and/or sell copies
   of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be
   included in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.

   ----------------------------------------------------------------------- */

/* -------------------------------------------------------------------
   The basic API is described in the README file.

   The raw API is designed to bypass some of the argument packing
   and unpacking on architectures for which it can be avoided.

   The closure API allows interpreted functions to be packaged up
   inside a C function pointer, so that they can be called as C functions,
   with no understanding on the client side that they are interpreted.
   It can also be used in other cases in which it is necessary to package
   up a user specified parameter and a function pointer as a single
   function pointer.

   The closure API must be implemented in order to get its functionality,
   e.g. for use by gij.  Routines are provided to emulate the raw API
   if the underlying platform doesn't allow faster implementation.

   More details on the raw and cloure API can be found in:

   http://gcc.gnu.org/ml/java/1999-q3/msg00138.html

   and

   http://gcc.gnu.org/ml/java/1999-q3/msg00174.html
   -------------------------------------------------------------------- */

#ifndef LIBFFI_H
#define LIBFFI_H

#ifdef __cplusplus
extern "C" {
#endif

/* Specify which architecture libffi is configured for. */
#ifndef @TARGET@
#define @TARGET@
#endif

/* ---- System configuration information --------------------------------- */

#include <ffitarget.h>

#ifndef LIBFFI_ASM

#ifdef _MSC_VER
#define __attribute__(X)
#endif

#include <stddef.h>
#include <limits.h>

/* LONG_LONG_MAX is not always defined (not if STRICT_ANSI, for example).
   But we can find it either under the correct ANSI name, or under GNU
   C's internal name.  */

#define FFI_64_BIT_MAX 9223372036854775807

#ifdef LONG_LONG_MAX
# define FFI_LONG_LONG_MAX LONG_LONG_MAX
#else
# ifdef LLONG_MAX
#  define FFI_LONG_LONG_MAX LLONG_MAX
#  ifdef _AIX52 /* or newer has C99 LLONG_MAX */
#   undef FFI_64_BIT_MAX
#   define FFI_64_BIT_MAX 9223372036854775807LL
#  endif /* _AIX52 or newer */
# else
#  ifdef __GNUC__
#   define FFI_LONG_LONG_MAX __LONG_LONG_MAX__
#  endif
#  ifdef _AIX /* AIX 5.1 and earlier have LONGLONG_MAX */
#   ifndef __PPC64__
#    if defined (__IBMC__) || defined (__IBMCPP__)
#     define FFI_LONG_LONG_MAX LONGLONG_MAX
#    endif
#   endif /* __PPC64__ */
#   undef  FFI_64_BIT_MAX
#   define FFI_64_BIT_MAX 9223372036854775807LL
#  endif
# endif
#endif

/* The closure code assumes that this works on pointers, i.e. a size_t	*/
/* can hold a pointer.							*/

typedef struct _ffi_type
{
  size_t size;
  unsigned short alignment;
  unsigned short type;
  struct _ffi_type **elements;
} ffi_type;

#ifndef LIBFFI_HIDE_BASIC_TYPES
#if SCHAR_MAX == 127
# define ffi_type_uchar                ffi_type_uint8
# define ffi_type_schar                ffi_type_sint8
#else
 #error "char size not supported"
#endif

#if SHRT_MAX == 32767
# define ffi_type_ushort       ffi_type_uint16
# define ffi_type_sshort       ffi_type_sint16
#elif SHRT_MAX == 2147483647
# define ffi_type_ushort       ffi_type_uint32
# define ffi_type_sshort       ffi_type_sint32
#else
 #error "short size not supported"
#endif

#if INT_MAX == 32767
# define ffi_type_uint         ffi_type_uint16
# define ffi_type_sint         ffi_type_sint16
#elif INT_MAX == 2147483647
# define ffi_type_uint         ffi_type_uint32
# define ffi_type_sint         ffi_type_sint32
#elif INT_MAX == 9223372036854775807
# define ffi_type_uint         ffi_type_uint64
# define ffi_type_sint         ffi_type_sint64
#else
 #error "int size not supported"
#endif

#if LONG_MAX == 2147483647
# if FFI_LONG_LONG_MAX != FFI_64_BIT_MAX
 #error "no 64-bit data type supported"
# endif
#elif LONG_MAX != FFI_64_BIT_MAX
 #error "long size not supported"
#endif

#if LONG_MAX == 2147483647
# define ffi_type_ulong        ffi_type_uint32
# define ffi_type_slong        ffi_type_sint32
#elif LONG_MAX == FFI_64_BIT_MAX
# define ffi_type_ulong        ffi_type_uint64
# define ffi_type_slong        ffi_type_sint64
#else
 #error "long size not supported"
#endif

/* Need minimal decorations for DLLs to works on Windows. */
/* GCC has autoimport and autoexport.  Rely on Libtool to */
/* help MSVC export from a DLL, but always declare data   */
/* to be imported for MSVC clients.  This costs an extra  */
/* indirection for MSVC clients using the static version  */
/* of the library, but don't worry about that.  Besides,  */
/* as a workaround, they can define FFI_BUILDING if they  */
/* *know* they are going to link with the static library. */
#if defined _MSC_VER && !defined FFI_BUILDING
#define FFI_EXTERN extern __declspec(dllimport)
#else
#define FFI_EXTERN extern
#endif

/* These are defined in types.c */
FFI_EXTERN ffi_type ffi_type_void;
FFI_EXTERN ffi_type ffi_type_uint8;
FFI_EXTERN ffi_type ffi_type_sint8;
FFI_EXTERN ffi_type ffi_type_uint16;
FFI_EXTERN ffi_type ffi_type_sint16;
FFI_EXTERN ffi_type ffi_type_uint32;
FFI_EXTERN ffi_type ffi_type_sint32;
FFI_EXTERN ffi_type ffi_type_uint64;
FFI_EXTERN ffi_type ffi_type_sint64;
FFI_EXTERN ffi_type ffi_type_float;
FFI_EXTERN ffi_type ffi_type_double;
FFI_EXTERN ffi_type ffi_type_pointer;

#if @HAVE_LONG_DOUBLE@
FFI_EXTERN ffi_type ffi_type_longdouble;
#else
#define ffi_type_longdouble ffi_type_double
#endif
#endif /* LIBFFI_HIDE_BASIC_TYPES */

typedef enum {
  FFI_OK = 0,
  FFI_BAD_TYPEDEF,
  FFI_BAD_ABI
} ffi_status;

typedef unsigned FFI_TYPE;

typedef struct {
  ffi_abi abi;
  unsigned nargs;
  ffi_type **arg_types;
  ffi_type *rtype;
  unsigned bytes;
  unsigned flags;
#ifdef FFI_EXTRA_CIF_FIELDS
  FFI_EXTRA_CIF_FIELDS;
#endif
} ffi_cif;

#if HAVE_LONG_DOUBLE_VARIANT
/* Used to adjust size/alignment of ffi types.  */
void ffi_prep_types (ffi_abi abi);
# endif

/* Used internally, but overridden by some architectures */
ffi_status ffi_prep_cif_core(ffi_cif *cif,
			     ffi_abi abi,
			     unsigned int isvariadic,
			     unsigned int nfixedargs,
			     unsigned int ntotalargs,
			     ffi_type *rtype,
			     ffi_type **atypes);

/* ---- Definitions for the raw API -------------------------------------- */

#ifndef FFI_SIZEOF_ARG
# if LONG_MAX == 2147483647
#  define FFI_SIZEOF_ARG        4
# elif LONG_MAX == FFI_64_BIT_MAX
#  define FFI_SIZEOF_ARG        8
# endif
#endif

#ifndef FFI_SIZEOF_JAVA_RAW
#  define FFI_SIZEOF_JAVA_RAW FFI_SIZEOF_ARG
#endif

typedef union {
  ffi_sarg  sint;
  ffi_arg   uint;
  float	    flt;
  char      data[FFI_SIZEOF_ARG];
  void*     ptr;
} ffi_raw;

#if FFI_SIZEOF_JAVA_RAW == 4 && FFI_SIZEOF_ARG == 8
/* This is a special case for mips64/n32 ABI (and perhaps others) where
   sizeof(void *) is 4 and FFI_SIZEOF_ARG is 8.  */
typedef union {
  signed int	sint;
  unsigned int	uint;
  float		flt;
  char		data[FFI_SIZEOF_JAVA_RAW];
  void*		ptr;
} ffi_java_raw;
#else
typedef ffi_raw ffi_java_raw;
#endif


void ffi_raw_call (ffi_cif *cif,
		   void (*fn)(void),
		   void *rvalue,
		   ffi_raw *avalue);

void ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw);
void ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args);
size_t ffi_raw_size (ffi_cif *cif);

/* This is analogous to the raw API, except it uses Java parameter	*/
/* packing, even on 64-bit machines.  I.e. on 64-bit machines		*/
/* longs and doubles are followed by an empty 64-bit word.		*/

void ffi_java_raw_call (ffi_cif *cif,
			void (*fn)(void),
			void *rvalue,
			ffi_java_raw *avalue);

void ffi_java_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_java_raw *raw);
void ffi_java_raw_to_ptrarray (ffi_cif *cif, ffi_java_raw *raw, void **args);
size_t ffi_java_raw_size (ffi_cif *cif);

/* ---- Definitions for closures ----------------------------------------- */

#if FFI_CLOSURES

#ifdef _MSC_VER
__declspec(align(8))
#endif
typedef struct {
#if @FFI_EXEC_TRAMPOLINE_TABLE@
  void *trampoline_table;
  void *trampoline_table_entry;
#else
  char tramp[FFI_TRAMPOLINE_SIZE];
#endif
  ffi_cif   *cif;
  void     (*fun)(ffi_cif*,void*,void**,void*);
  void      *user_data;
#ifdef __GNUC__
} ffi_closure __attribute__((aligned (8)));
#else
} ffi_closure;
# ifdef __sgi
#  pragma pack 0
# endif
#endif

void *ffi_closure_alloc (size_t size, void **code);
void ffi_closure_free (void *);

ffi_status
ffi_prep_closure (ffi_closure*,
		  ffi_cif *,
		  void (*fun)(ffi_cif*,void*,void**,void*),
		  void *user_data);

ffi_status
ffi_prep_closure_loc (ffi_closure*,
		      ffi_cif *,
		      void (*fun)(ffi_cif*,void*,void**,void*),
		      void *user_data,
		      void*codeloc);

#ifdef __sgi
# pragma pack 8
#endif
typedef struct {
#if @FFI_EXEC_TRAMPOLINE_TABLE@
  void *trampoline_table;
  void *trampoline_table_entry;
#else
  char tramp[FFI_TRAMPOLINE_SIZE];
#endif
  ffi_cif   *cif;

#if !FFI_NATIVE_RAW_API

  /* if this is enabled, then a raw closure has the same layout 
     as a regular closure.  We use this to install an intermediate 
     handler to do the transaltion, void** -> ffi_raw*. */

  void     (*translate_args)(ffi_cif*,void*,void**,void*);
  void      *this_closure;

#endif

  void     (*fun)(ffi_cif*,void*,ffi_raw*,void*);
  void      *user_data;

} ffi_raw_closure;

typedef struct {
#if @FFI_EXEC_TRAMPOLINE_TABLE@
  void *trampoline_table;
  void *trampoline_table_entry;
#else
  char tramp[FFI_TRAMPOLINE_SIZE];
#endif

  ffi_cif   *cif;

#if !FFI_NATIVE_RAW_API

  /* if this is enabled, then a raw closure has the same layout 
     as a regular closure.  We use this to install an intermediate 
     handler to do the transaltion, void** -> ffi_raw*. */

  void     (*translate_args)(ffi_cif*,void*,void**,void*);
  void      *this_closure;

#endif

  void     (*fun)(ffi_cif*,void*,ffi_java_raw*,void*);
  void      *user_data;

} ffi_java_raw_closure;

ffi_status
ffi_prep_raw_closure (ffi_raw_closure*,
		      ffi_cif *cif,
		      void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
		      void *user_data);

ffi_status
ffi_prep_raw_closure_loc (ffi_raw_closure*,
			  ffi_cif *cif,
			  void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
			  void *user_data,
			  void *codeloc);

ffi_status
ffi_prep_java_raw_closure (ffi_java_raw_closure*,
		           ffi_cif *cif,
		           void (*fun)(ffi_cif*,void*,ffi_java_raw*,void*),
		           void *user_data);

ffi_status
ffi_prep_java_raw_closure_loc (ffi_java_raw_closure*,
			       ffi_cif *cif,
			       void (*fun)(ffi_cif*,void*,ffi_java_raw*,void*),
			       void *user_data,
			       void *codeloc);

#endif /* FFI_CLOSURES */

/* ---- Public interface definition -------------------------------------- */

ffi_status ffi_prep_cif(ffi_cif *cif,
			ffi_abi abi,
			unsigned int nargs,
			ffi_type *rtype,
			ffi_type **atypes);

ffi_status ffi_prep_cif_var(ffi_cif *cif,
			    ffi_abi abi,
			    unsigned int nfixedargs,
			    unsigned int ntotalargs,
			    ffi_type *rtype,
			    ffi_type **atypes);

void ffi_call(ffi_cif *cif,
	      void (*fn)(void),
	      void *rvalue,
	      void **avalue);

/* Useful for eliminating compiler warnings */
#define FFI_FN(f) ((void (*)(void))f)

/* ---- Definitions shared with assembly code ---------------------------- */

#endif

/* If these change, update src/mips/ffitarget.h. */
#define FFI_TYPE_VOID       0    
#define FFI_TYPE_INT        1
#define FFI_TYPE_FLOAT      2    
#define FFI_TYPE_DOUBLE     3
#if @HAVE_LONG_DOUBLE@
#define FFI_TYPE_LONGDOUBLE 4
#else
#define FFI_TYPE_LONGDOUBLE FFI_TYPE_DOUBLE
#endif
#define FFI_TYPE_UINT8      5   
#define FFI_TYPE_SINT8      6
#define FFI_TYPE_UINT16     7 
#define FFI_TYPE_SINT16     8
#define FFI_TYPE_UINT32     9
#define FFI_TYPE_SINT32     10
#define FFI_TYPE_UINT64     11
#define FFI_TYPE_SINT64     12
#define FFI_TYPE_STRUCT     13
#define FFI_TYPE_POINTER    14

/* This should always refer to the last type code (for sanity checks) */
#define FFI_TYPE_LAST       FFI_TYPE_POINTER

#ifdef __cplusplus
}
#endif

#endif