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/* -----------------------------------------------------------------------
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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_common.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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static ffi_status initialize_aggregate(/*@out@*/ ffi_type *arg)
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FFI_ASSERT(arg != NULL);
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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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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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/* 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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return FFI_BAD_TYPEDEF;
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#if defined X86_DARWIN || defined X86_FREEBSD
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static int is_result_on_stack_sub(ffi_type *rtype)
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for (i = 0; rtype->elements[i] != NULL; ++i)
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ffi_type *elem = rtype->elements[i];
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if (elem->type == FFI_TYPE_STRUCT)
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if (is_result_on_stack_sub(elem))
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size = ffi_type_uint8.size;
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case FFI_TYPE_UINT16:
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case FFI_TYPE_SINT16:
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size = ffi_type_sint16.size;
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case FFI_TYPE_UINT32:
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case FFI_TYPE_SINT32:
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size = ffi_type_uint32.size;
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case FFI_TYPE_UINT64:
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case FFI_TYPE_SINT64:
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size = ffi_type_uint64.size;
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case FFI_TYPE_POINTER:
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size = ffi_type_pointer.size;
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size = ffi_type_float.size;
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case FFI_TYPE_DOUBLE:
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size = ffi_type_double.size;
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case FFI_TYPE_LONGDOUBLE:
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size = ffi_type_longdouble.size;
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if (size < elem->size)
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static int is_result_on_stack(ffi_type *rtype)
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if (rtype->type == FFI_TYPE_STRUCT)
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return is_result_on_stack_sub(rtype);
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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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FFI_ASSERT(cif != NULL);
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FFI_ASSERT((abi > FFI_FIRST_ABI) && (abi <= FFI_DEFAULT_ABI));
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cif->arg_types = atypes;
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/* Initialize the return type if necessary */
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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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/* 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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&& (cif->abi != FFI_V9 || cif->rtype->size > 32)
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#elif defined X86_DARWIN || defined X86_FREEBSD
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&& is_result_on_stack(cif->rtype)
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bytes = STACK_ARG_SIZE(sizeof(void*));
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for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
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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 && !defined X86_DARWIN && !defined X86_FREEBSD
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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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/* 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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int align = (*ptr)->alignment;
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if (align < 4) align = 4;
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if ((align - 1) & bytes)
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bytes = ALIGN(bytes, align);
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bytes += STACK_ARG_SIZE((*ptr)->size);
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#if defined X86_DARWIN || defined X86_FREEBSD
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cif->bytes = ((bytes + 15) & ~0xf) + 8;
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if (is_result_on_stack(cif->rtype))
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cif->flags = FFI_TYPE_STRUCT;
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cif->flags = FFI_TYPE_SINT64; /* same as int64 type */
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/* Perform machine dependent cif processing */
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return ffi_prep_cif_machdep(cif);
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#endif /* not __CRIS__ */
added
removed
libffi/src/prep_cif.c
