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authorMatthias Benkard <code@mail.matthias.benkard.de>2008-01-26 12:06:34 +0100
committerMatthias Benkard <code@mail.matthias.benkard.de>2008-01-26 12:06:34 +0100
commit181d8ded82d49d0133d9d6fd1631d9816c970bfa (patch)
treec2791efcee34197c93ed964873c1ff30bf398330 /libffi/src/prep_cif.c
parent28a686ef16077f75afbfa3d315cd268680e11b75 (diff)
Import libffi from PyObjC 1.3.7.
darcs-hash:129bccb59266f997deac9b0353aea2d2d4049f92
Diffstat (limited to 'libffi/src/prep_cif.c')
-rw-r--r--libffi/src/prep_cif.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/libffi/src/prep_cif.c b/libffi/src/prep_cif.c
new file mode 100644
index 0000000..43326ad
--- /dev/null
+++ b/libffi/src/prep_cif.c
@@ -0,0 +1,172 @@
+/* -----------------------------------------------------------------------
+ prep_cif.c - Copyright (c) 1996, 1998 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 CYGNUS SOLUTIONS 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) ALIGN(x, FFI_SIZEOF_ARG)
+
+/* Perform machine independent initialization of aggregate type
+ specifications. */
+
+static ffi_status initialize_aggregate(/*@out@*/ ffi_type *arg)
+{
+ ffi_type **ptr;
+
+ FFI_ASSERT(arg != NULL);
+
+ /*@-usedef@*/
+
+ FFI_ASSERT(arg->elements != NULL);
+ FFI_ASSERT(arg->size == 0);
+ FFI_ASSERT(arg->alignment == 0);
+
+ ptr = &(arg->elements[0]);
+
+ while ((*ptr) != NULL)
+ {
+ if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
+ return FFI_BAD_TYPEDEF;
+
+ /* Perform a sanity check on the argument type */
+ FFI_ASSERT_VALID_TYPE(*ptr);
+
+ arg->size = ALIGN(arg->size, (*ptr)->alignment);
+ 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 = ALIGN (arg->size, arg->alignment);
+
+ if (arg->size == 0)
+ return FFI_BAD_TYPEDEF;
+ else
+ return FFI_OK;
+
+ /*@=usedef@*/
+}
+
+/* Perform machine independent ffi_cif preparation, then call
+ machine dependent routine. */
+
+ffi_status ffi_prep_cif(/*@out@*/ /*@partial@*/ ffi_cif *cif,
+ ffi_abi abi, unsigned int nargs,
+ /*@dependent@*/ /*@out@*/ /*@partial@*/ ffi_type *rtype,
+ /*@dependent@*/ ffi_type **atypes)
+{
+ unsigned bytes = 0;
+ unsigned int i;
+ ffi_type **ptr;
+
+ FFI_ASSERT(cif != NULL);
+ FFI_ASSERT((abi > FFI_FIRST_ABI) && (abi <= FFI_DEFAULT_ABI));
+
+ cif->abi = abi;
+ cif->arg_types = atypes;
+ cif->nargs = nargs;
+ cif->rtype = rtype;
+
+ cif->flags = 0;
+
+ /* Initialize the return type if necessary */
+ /*@-usedef@*/
+ if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
+ return FFI_BAD_TYPEDEF;
+ /*@=usedef@*/
+
+ /* Perform a sanity check on the return type */
+ FFI_ASSERT_VALID_TYPE(cif->rtype);
+
+ /* x86-64 and s390 stack space allocation is handled in prep_machdep. */
+#if !defined M68K && !defined __x86_64__ && !defined S390 && !defined PA
+ /* Make space for the return structure pointer */
+ if (cif->rtype->type == FFI_TYPE_STRUCT
+#ifdef SPARC
+ && (cif->abi != FFI_V9 || cif->rtype->size > 32)
+#endif
+#ifdef __i386__ /* FIXME: only on darwin */
+ && (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)) != FFI_OK))
+ return FFI_BAD_TYPEDEF;
+
+ /* Perform a sanity check on the argument type, do this
+ check after the initialization. */
+ FFI_ASSERT_VALID_TYPE(*ptr);
+
+#ifdef X86_DARWIN
+ {
+ /* Add padding, but at most to 4 bytes */
+ int align = (*ptr)->alignment;
+ if (align>4) align = 4;
+ if ((align - 1) & bytes)
+ bytes = ALIGN(bytes, align);
+ bytes += STACK_ARG_SIZE((*ptr)->size);
+ }
+#elif !defined __x86_64__ && !defined S390 && !defined PA
+#ifdef SPARC
+ if (((*ptr)->type == FFI_TYPE_STRUCT
+ && ((*ptr)->size > 16 || cif->abi != FFI_V9))
+ || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
+ && cif->abi != FFI_V9))
+ bytes += sizeof(void*);
+ else
+#endif
+ {
+ /* Add any padding if necessary */
+ if (((*ptr)->alignment - 1) & bytes)
+ bytes = ALIGN(bytes, (*ptr)->alignment);
+
+ bytes += STACK_ARG_SIZE((*ptr)->size);
+ }
+#endif
+ }
+
+ cif->bytes = bytes;
+
+ /* Perform machine dependent cif processing */
+ return ffi_prep_cif_machdep(cif);
+}