libffi/src/prep_cif.c

   1 /* -----------------------------------------------------------------------
   2    prep_cif.c - Copyright (c) 1996, 1998  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 #include <ffi.h>
  25 #include <ffi_common.h>
  26 #include <stdlib.h>
  27
  28
  29 /* Round up to SIZEOF_ARG. */
  30
  31 #define STACK_ARG_SIZE(x) ALIGN(x, SIZEOF_ARG)
  32
  33 /* Perform machine independent initialization of aggregate type
  34    specifications. */
  35
  36 static ffi_status initialize_aggregate(/*@out@*/ ffi_type *arg)
  37 {
  38   ffi_type **ptr;
  39
  40   FFI_ASSERT(arg != NULL);
  41
  42   /*@-usedef@*/
  43
  44   FFI_ASSERT(arg->elements != NULL);
  45   FFI_ASSERT(arg->size == 0);
  46   FFI_ASSERT(arg->alignment == 0);
  47
  48   ptr = &(arg->elements[0]);
  49
  50   while ((*ptr) != NULL)
  51     {
  52       if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
  53         return FFI_BAD_TYPEDEF;
  54
  55       /* Perform a sanity check on the argument type */
  56       FFI_ASSERT(ffi_type_test((*ptr)));
  57
  58       arg->size = ALIGN(arg->size, (*ptr)->alignment);
  59       arg->size += (*ptr)->size;
  60
  61       arg->alignment = (arg->alignment > (*ptr)->alignment) ?
  62         arg->alignment : (*ptr)->alignment;
  63
  64       ptr++;
  65     }
  66
  67   if (arg->size == 0)
  68     return FFI_BAD_TYPEDEF;
  69   else
  70     return FFI_OK;
  71
  72   /*@=usedef@*/
  73 }
  74
  75 /* Perform machine independent ffi_cif preparation, then call
  76    machine dependent routine. */
  77
  78 ffi_status ffi_prep_cif(/*@out@*/ /*@partial@*/ ffi_cif *cif,
  79                         ffi_abi abi, unsigned int nargs,
  80                         /*@dependent@*/ /*@out@*/ /*@partial@*/ ffi_type *rtype,
  81                         /*@dependent@*/ ffi_type **atypes)
  82 {
  83   unsigned bytes = 0;
  84   unsigned int i;
  85   ffi_type **ptr;
  86
  87   FFI_ASSERT(cif != NULL);
  88   FFI_ASSERT((abi > FFI_FIRST_ABI) && (abi < FFI_LAST_ABI));
  89
  90   cif->abi = abi;
  91   cif->arg_types = atypes;
  92   cif->nargs = nargs;
  93   cif->rtype = rtype;
  94
  95   cif->flags = 0;
  96
  97   /* Initialize the return type if necessary */
  98   /*@-usedef@*/
  99   if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
 100     return FFI_BAD_TYPEDEF;
 101   /*@=usedef@*/
 102
 103   /* Perform a sanity check on the return type */
 104   FFI_ASSERT(ffi_type_test(cif->rtype));
 105
 106   /* x86-64 and s390 stack space allocation is handled in prep_machdep.
 107      TODO: Disable this for s390 too?  */
 108 #if !defined M68K && !defined __x86_64__
 109   /* Make space for the return structure pointer */
 110   if (cif->rtype->type == FFI_TYPE_STRUCT
 111 #ifdef SPARC
 112       && (cif->abi != FFI_V9 || cif->rtype->size > 32)
 113 #endif
 114       )
 115     bytes = STACK_ARG_SIZE(sizeof(void*));
 116 #endif
 117
 118   for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
 119     {
 120       /* Perform a sanity check on the argument type */
 121       FFI_ASSERT(ffi_type_test(*ptr));
 122
 123       /* Initialize any uninitialized aggregate type definitions */
 124       if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
 125         return FFI_BAD_TYPEDEF;
 126
 127       /* TODO: Disable this calculation for s390 too?  */
 128 #ifndef __x86_64__
 129 #ifdef SPARC
 130       if (((*ptr)->type == FFI_TYPE_STRUCT
 131            && ((*ptr)->size > 16 || cif->abi != FFI_V9))
 132           || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
 133               && cif->abi != FFI_V9))
 134         bytes += sizeof(void*);
 135       else
 136 #endif
 137         {
 138           /* Add any padding if necessary */
 139           if (((*ptr)->alignment - 1) & bytes)
 140             bytes = ALIGN(bytes, (*ptr)->alignment);
 141
 142           bytes += STACK_ARG_SIZE((*ptr)->size);
 143         }
 144 #endif
 145     }
 146
 147   cif->bytes = bytes;
 148
 149   /* Perform machine dependent cif processing */
 150   return ffi_prep_cif_machdep(cif);
 151 }