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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [libffi/] [src/] [prep_cif.c] - Blame information for rev 14

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1 14 jlechner
/* -----------------------------------------------------------------------
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   prep_cif.c - Copyright (c) 1996, 1998  Red Hat, Inc.
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   Permission is hereby granted, free of charge, to any person obtaining
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   a copy of this software and associated documentation files (the
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   ``Software''), to deal in the Software without restriction, including
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   without limitation the rights to use, copy, modify, merge, publish,
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   distribute, sublicense, and/or sell copies of the Software, and to
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   permit persons to whom the Software is furnished to do so, subject to
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   the following conditions:
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   The above copyright notice and this permission notice shall be included
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   in all copies or substantial portions of the Software.
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   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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   IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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   OTHER DEALINGS IN THE SOFTWARE.
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   ----------------------------------------------------------------------- */
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#include <ffi.h>
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#include <ffi_common.h>
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#include <stdlib.h>
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/* Round up to FFI_SIZEOF_ARG. */
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#define STACK_ARG_SIZE(x) ALIGN(x, FFI_SIZEOF_ARG)
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/* Perform machine independent initialization of aggregate type
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   specifications. */
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static ffi_status initialize_aggregate(/*@out@*/ ffi_type *arg)
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{
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  ffi_type **ptr;
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  FFI_ASSERT(arg != NULL);
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  /*@-usedef@*/
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  FFI_ASSERT(arg->elements != NULL);
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  FFI_ASSERT(arg->size == 0);
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  FFI_ASSERT(arg->alignment == 0);
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  ptr = &(arg->elements[0]);
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  while ((*ptr) != NULL)
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    {
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      if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
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        return FFI_BAD_TYPEDEF;
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      /* Perform a sanity check on the argument type */
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      FFI_ASSERT_VALID_TYPE(*ptr);
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      arg->size = ALIGN(arg->size, (*ptr)->alignment);
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      arg->size += (*ptr)->size;
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      arg->alignment = (arg->alignment > (*ptr)->alignment) ?
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        arg->alignment : (*ptr)->alignment;
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      ptr++;
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    }
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  /* Structure size includes tail padding.  This is important for
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     structures that fit in one register on ABIs like the PowerPC64
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     Linux ABI that right justify small structs in a register.
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     It's also needed for nested structure layout, for example
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     struct A { long a; char b; }; struct B { struct A x; char y; };
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     should find y at an offset of 2*sizeof(long) and result in a
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     total size of 3*sizeof(long).  */
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  arg->size = ALIGN (arg->size, arg->alignment);
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  if (arg->size == 0)
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    return FFI_BAD_TYPEDEF;
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  else
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    return FFI_OK;
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  /*@=usedef@*/
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}
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#ifndef __CRIS__
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/* The CRIS ABI specifies structure elements to have byte
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   alignment only, so it completely overrides this functions,
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   which assumes "natural" alignment and padding.  */
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/* Perform machine independent ffi_cif preparation, then call
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   machine dependent routine. */
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ffi_status ffi_prep_cif(/*@out@*/ /*@partial@*/ ffi_cif *cif,
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                        ffi_abi abi, unsigned int nargs,
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                        /*@dependent@*/ /*@out@*/ /*@partial@*/ ffi_type *rtype,
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                        /*@dependent@*/ ffi_type **atypes)
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{
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  unsigned bytes = 0;
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  unsigned int i;
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  ffi_type **ptr;
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  FFI_ASSERT(cif != NULL);
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  FFI_ASSERT((abi > FFI_FIRST_ABI) && (abi <= FFI_DEFAULT_ABI));
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  cif->abi = abi;
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  cif->arg_types = atypes;
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  cif->nargs = nargs;
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  cif->rtype = rtype;
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  cif->flags = 0;
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  /* Initialize the return type if necessary */
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  /*@-usedef@*/
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  if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
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    return FFI_BAD_TYPEDEF;
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  /*@=usedef@*/
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  /* Perform a sanity check on the return type */
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  FFI_ASSERT_VALID_TYPE(cif->rtype);
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  /* x86-64 and s390 stack space allocation is handled in prep_machdep.  */
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#if !defined M68K && !defined __x86_64__ && !defined S390 && !defined PA
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  /* Make space for the return structure pointer */
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  if (cif->rtype->type == FFI_TYPE_STRUCT
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#ifdef SPARC
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      && (cif->abi != FFI_V9 || cif->rtype->size > 32)
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#endif
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      )
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    bytes = STACK_ARG_SIZE(sizeof(void*));
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#endif
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  for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
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    {
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      /* Initialize any uninitialized aggregate type definitions */
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      if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
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        return FFI_BAD_TYPEDEF;
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      /* Perform a sanity check on the argument type, do this
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         check after the initialization.  */
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      FFI_ASSERT_VALID_TYPE(*ptr);
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#if !defined __x86_64__ && !defined S390 && !defined PA
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#ifdef SPARC
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      if (((*ptr)->type == FFI_TYPE_STRUCT
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           && ((*ptr)->size > 16 || cif->abi != FFI_V9))
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          || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
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              && cif->abi != FFI_V9))
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        bytes += sizeof(void*);
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      else
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#endif
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        {
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          /* Add any padding if necessary */
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          if (((*ptr)->alignment - 1) & bytes)
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            bytes = ALIGN(bytes, (*ptr)->alignment);
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          bytes += STACK_ARG_SIZE((*ptr)->size);
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        }
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#endif
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    }
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  cif->bytes = bytes;
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  /* Perform machine dependent cif processing */
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  return ffi_prep_cif_machdep(cif);
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}
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#endif /* not __CRIS__ */

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