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

   prep_cif.c - Copyright (c) 2011, 2012  Anthony Green

                Copyright (c) 1996, 1998, 2007  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.

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

#include <ffi.h>

#include <ffi_common.h>

#include <stdlib.h>

/* Round up to FFI_SIZEOF_ARG. */

#define STACK_ARG_SIZE(x) FFI_ALIGN(x, FFI_SIZEOF_ARG)

/* Perform machine independent initialization of aggregate type

   specifications. */

static ffi_status initialize_aggregate(ffi_type *arg, size_t *offsets)

{

  ffi_type **ptr;

  if (UNLIKELY(arg == NULL || arg->elements == NULL))

    return FFI_BAD_TYPEDEF;

  arg->size = 0;

  arg->alignment = 0;

  ptr = &(arg->elements[0]);

  if (UNLIKELY(ptr == 0))

    return FFI_BAD_TYPEDEF;

  while ((*ptr) != NULL)

    {

      if (UNLIKELY(((*ptr)->size == 0)

        && (initialize_aggregate((*ptr), NULL) != FFI_OK)))

  return FFI_BAD_TYPEDEF;

      /* Perform a sanity check on the argument type */

      FFI_ASSERT_VALID_TYPE(*ptr);

      arg->size = FFI_ALIGN(arg->size, (*ptr)->alignment);

      if (offsets)

  *offsets++ = arg->size;

      arg->size += (*ptr)->size;

      arg->alignment = (arg->alignment > (*ptr)->alignment) ?

  arg->alignment : (*ptr)->alignment;

      ptr++;

    }

  /* Structure size includes tail padding.  This is important for

     structures that fit in one register on ABIs like the PowerPC64

     Linux ABI that right justify small structs in a register.

     It's also needed for nested structure layout, for example

     struct A { long a; char b; }; struct B { struct A x; char y; };

     should find y at an offset of 2*sizeof(long) and result in a

     total size of 3*sizeof(long).  */

  arg->size = FFI_ALIGN (arg->size, arg->alignment);

  /* On some targets, the ABI defines that structures have an additional

     alignment beyond the "natural" one based on their elements.  */

#ifdef FFI_AGGREGATE_ALIGNMENT

  if (FFI_AGGREGATE_ALIGNMENT > arg->alignment)

    arg->alignment = FFI_AGGREGATE_ALIGNMENT;

#endif

  if (arg->size == 0)

    return FFI_BAD_TYPEDEF;

  else

    return FFI_OK;

}

#ifndef __CRIS__

/* The CRIS ABI specifies structure elements to have byte

   alignment only, so it completely overrides this functions,

   which assumes "natural" alignment and padding.  */

/* Perform machine independent ffi_cif preparation, then call

   machine dependent routine. */

/* For non variadic functions isvariadic should be 0 and

   nfixedargs==ntotalargs.

   For variadic calls, isvariadic should be 1 and nfixedargs

   and ntotalargs set as appropriate. nfixedargs must always be >=1 */

ffi_status FFI_HIDDEN 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)

{

  unsigned bytes = 0;

  unsigned int i;

  ffi_type **ptr;

  FFI_ASSERT(cif != NULL);

  FFI_ASSERT((!isvariadic) || (nfixedargs >= 1));

  FFI_ASSERT(nfixedargs <= ntotalargs);

  if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI))

    return FFI_BAD_ABI;

  cif->abi = abi;

  cif->arg_types = atypes;

  cif->nargs = ntotalargs;

  cif->rtype = rtype;

  cif->flags = 0;

#ifdef _M_ARM64

  cif->isVariadic = isvariadic;

#endif

#if HAVE_LONG_DOUBLE_VARIANT

  ffi_prep_types (abi);

#endif

  /* Initialize the return type if necessary */

  if ((cif->rtype->size == 0)

      && (initialize_aggregate(cif->rtype, NULL) != FFI_OK))

    return FFI_BAD_TYPEDEF;

#ifndef FFI_TARGET_HAS_COMPLEX_TYPE

  if (rtype->type == FFI_TYPE_COMPLEX)

    abort();

#endif

  /* Perform a sanity check on the return type */

  FFI_ASSERT_VALID_TYPE(cif->rtype);

  /* x86, x86-64 and s390 stack space allocation is handled in prep_machdep. */

#if !defined FFI_TARGET_SPECIFIC_STACK_SPACE_ALLOCATION

  /* Make space for the return structure pointer */

  if (cif->rtype->type == FFI_TYPE_STRUCT

#ifdef TILE

      && (cif->rtype->size > 10 * FFI_SIZEOF_ARG)

#endif

#ifdef XTENSA

      && (cif->rtype->size > 16)

#endif

#ifdef NIOS2

      && (cif->rtype->size > 8)

#endif

     )

    bytes = STACK_ARG_SIZE(sizeof(void*));

#endif

  for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)

    {

      /* Initialize any uninitialized aggregate type definitions */

      if (((*ptr)->size == 0)

    && (initialize_aggregate((*ptr), NULL) != FFI_OK))

  return FFI_BAD_TYPEDEF;

#ifndef FFI_TARGET_HAS_COMPLEX_TYPE

      if ((*ptr)->type == FFI_TYPE_COMPLEX)

  abort();

#endif

      /* Perform a sanity check on the argument type, do this

   check after the initialization.  */

      FFI_ASSERT_VALID_TYPE(*ptr);

#if !defined FFI_TARGET_SPECIFIC_STACK_SPACE_ALLOCATION

  {

    /* Add any padding if necessary */

    if (((*ptr)->alignment - 1) & bytes)

      bytes = (unsigned)FFI_ALIGN(bytes, (*ptr)->alignment);

#ifdef TILE

    if (bytes < 10 * FFI_SIZEOF_ARG &&

        bytes + STACK_ARG_SIZE((*ptr)->size) > 10 * FFI_SIZEOF_ARG)

      {

        /* An argument is never split between the 10 parameter

     registers and the stack.  */

        bytes = 10 * FFI_SIZEOF_ARG;

      }

#endif

#ifdef XTENSA

    if (bytes <= 6*4 && bytes + STACK_ARG_SIZE((*ptr)->size) > 6*4)

      bytes = 6*4;

#endif

    bytes += (unsigned int)STACK_ARG_SIZE((*ptr)->size);

  }

#endif

    }

  cif->bytes = bytes;

  /* Perform machine dependent cif processing */

#ifdef FFI_TARGET_SPECIFIC_VARIADIC

  if (isvariadic)

  return ffi_prep_cif_machdep_var(cif, nfixedargs, ntotalargs);

#endif

  return ffi_prep_cif_machdep(cif);

}

#endif /* not __CRIS__ */

ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs,

           ffi_type *rtype, ffi_type **atypes)

{

  return ffi_prep_cif_core(cif, abi, 0, nargs, nargs, rtype, 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)

{

  return ffi_prep_cif_core(cif, abi, 1, nfixedargs, ntotalargs, rtype, atypes);

}

#if FFI_CLOSURES

ffi_status

ffi_prep_closure (ffi_closure* closure,

      ffi_cif* cif,

      void (*fun)(ffi_cif*,void*,void**,void*),

      void *user_data)

{

  return ffi_prep_closure_loc (closure, cif, fun, user_data, closure);

}

#endif

ffi_status

ffi_get_struct_offsets (ffi_abi abi, ffi_type *struct_type, size_t *offsets)

{

  if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI))

    return FFI_BAD_ABI;

  if (struct_type->type != FFI_TYPE_STRUCT)

    return FFI_BAD_TYPEDEF;

#if HAVE_LONG_DOUBLE_VARIANT

  ffi_prep_types (abi);

#endif

  return initialize_aggregate(struct_type, offsets);

}