From 181d8ded82d49d0133d9d6fd1631d9816c970bfa Mon Sep 17 00:00:00 2001 From: Matthias Benkard Date: Sat, 26 Jan 2008 12:06:34 +0100 Subject: Import libffi from PyObjC 1.3.7. darcs-hash:129bccb59266f997deac9b0353aea2d2d4049f92 --- libffi/src/prep_cif.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 libffi/src/prep_cif.c (limited to 'libffi/src/prep_cif.c') 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 +#include +#include + + +/* 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); +} -- cgit v1.2.3