1 /* -----------------------------------------------------------------------
2 prep_cif.c - Copyright (c) 2011, 2012 Anthony Green
3 Copyright (c) 1996, 1998, 2007 Red Hat, Inc.
5 Permission is hereby granted, free of charge, to any person obtaining
6 a copy of this software and associated documentation files (the
7 ``Software''), to deal in the Software without restriction, including
8 without limitation the rights to use, copy, modify, merge, publish,
9 distribute, sublicense, and/or sell copies of the Software, and to
10 permit persons to whom the Software is furnished to do so, subject to
11 the following conditions:
13 The above copyright notice and this permission notice shall be included
14 in all copies or substantial portions of the Software.
16 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
20 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 DEALINGS IN THE SOFTWARE.
24 ----------------------------------------------------------------------- */
27 #include <ffi_common.h>
30 /* Round up to FFI_SIZEOF_ARG. */
32 #define STACK_ARG_SIZE(x) ALIGN(x, FFI_SIZEOF_ARG)
34 /* Perform machine independent initialization of aggregate type
37 static ffi_status initialize_aggregate(ffi_type *arg)
41 if (UNLIKELY(arg == NULL || arg->elements == NULL))
42 return FFI_BAD_TYPEDEF;
47 ptr = &(arg->elements[0]);
49 if (UNLIKELY(ptr == 0))
50 return FFI_BAD_TYPEDEF;
52 while ((*ptr) != NULL)
54 if (UNLIKELY(((*ptr)->size == 0)
55 && (initialize_aggregate((*ptr)) != FFI_OK)))
56 return FFI_BAD_TYPEDEF;
58 /* Perform a sanity check on the argument type */
59 FFI_ASSERT_VALID_TYPE(*ptr);
61 arg->size = ALIGN(arg->size, (*ptr)->alignment);
62 arg->size += (*ptr)->size;
64 arg->alignment = (arg->alignment > (*ptr)->alignment) ?
65 arg->alignment : (*ptr)->alignment;
70 /* Structure size includes tail padding. This is important for
71 structures that fit in one register on ABIs like the PowerPC64
72 Linux ABI that right justify small structs in a register.
73 It's also needed for nested structure layout, for example
74 struct A { long a; char b; }; struct B { struct A x; char y; };
75 should find y at an offset of 2*sizeof(long) and result in a
76 total size of 3*sizeof(long). */
77 arg->size = ALIGN (arg->size, arg->alignment);
79 /* On some targets, the ABI defines that structures have an additional
80 alignment beyond the "natural" one based on their elements. */
81 #ifdef FFI_AGGREGATE_ALIGNMENT
82 if (FFI_AGGREGATE_ALIGNMENT > arg->alignment)
83 arg->alignment = FFI_AGGREGATE_ALIGNMENT;
87 return FFI_BAD_TYPEDEF;
93 /* The CRIS ABI specifies structure elements to have byte
94 alignment only, so it completely overrides this functions,
95 which assumes "natural" alignment and padding. */
97 /* Perform machine independent ffi_cif preparation, then call
98 machine dependent routine. */
100 /* For non variadic functions isvariadic should be 0 and
101 nfixedargs==ntotalargs.
103 For variadic calls, isvariadic should be 1 and nfixedargs
104 and ntotalargs set as appropriate. nfixedargs must always be >=1 */
107 ffi_status FFI_HIDDEN ffi_prep_cif_core(ffi_cif *cif, ffi_abi abi,
108 unsigned int isvariadic,
109 unsigned int nfixedargs,
110 unsigned int ntotalargs,
111 ffi_type *rtype, ffi_type **atypes)
117 FFI_ASSERT(cif != NULL);
118 FFI_ASSERT((!isvariadic) || (nfixedargs >= 1));
119 FFI_ASSERT(nfixedargs <= ntotalargs);
121 if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI))
125 cif->arg_types = atypes;
126 cif->nargs = ntotalargs;
131 #if HAVE_LONG_DOUBLE_VARIANT
132 ffi_prep_types (abi);
135 /* Initialize the return type if necessary */
136 if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
137 return FFI_BAD_TYPEDEF;
139 /* Perform a sanity check on the return type */
140 FFI_ASSERT_VALID_TYPE(cif->rtype);
142 /* x86, x86-64 and s390 stack space allocation is handled in prep_machdep. */
143 #if !defined M68K && !defined X86_ANY && !defined S390 && !defined PA
144 /* Make space for the return structure pointer */
145 if (cif->rtype->type == FFI_TYPE_STRUCT
147 && (cif->abi != FFI_V9 || cif->rtype->size > 32)
150 && (cif->rtype->size > 10 * FFI_SIZEOF_ARG)
153 && (cif->rtype->size > 16)
156 && (cif->rtype->size > 8)
159 bytes = STACK_ARG_SIZE(sizeof(void*));
162 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
165 /* Initialize any uninitialized aggregate type definitions */
166 if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
167 return FFI_BAD_TYPEDEF;
169 /* Perform a sanity check on the argument type, do this
170 check after the initialization. */
171 FFI_ASSERT_VALID_TYPE(*ptr);
173 #if !defined X86_ANY && !defined S390 && !defined PA
175 if (((*ptr)->type == FFI_TYPE_STRUCT
176 && ((*ptr)->size > 16 || cif->abi != FFI_V9))
177 || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
178 && cif->abi != FFI_V9))
179 bytes += sizeof(void*);
183 /* Add any padding if necessary */
184 if (((*ptr)->alignment - 1) & bytes)
185 bytes = (unsigned)ALIGN(bytes, (*ptr)->alignment);
188 if (bytes < 10 * FFI_SIZEOF_ARG &&
189 bytes + STACK_ARG_SIZE((*ptr)->size) > 10 * FFI_SIZEOF_ARG)
191 /* An argument is never split between the 10 parameter
192 registers and the stack. */
193 bytes = 10 * FFI_SIZEOF_ARG;
197 if (bytes <= 6*4 && bytes + STACK_ARG_SIZE((*ptr)->size) > 6*4)
201 bytes += STACK_ARG_SIZE((*ptr)->size);
208 /* Perform machine dependent cif processing */
209 #ifdef FFI_TARGET_SPECIFIC_VARIADIC
211 return ffi_prep_cif_machdep_var(cif, nfixedargs, ntotalargs);
214 return ffi_prep_cif_machdep(cif);
216 #endif /* not __CRIS__ */
218 ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs,
219 ffi_type *rtype, ffi_type **atypes)
221 return ffi_prep_cif_core(cif, abi, 0, nargs, nargs, rtype, atypes);
224 ffi_status ffi_prep_cif_var(ffi_cif *cif,
226 unsigned int nfixedargs,
227 unsigned int ntotalargs,
231 return ffi_prep_cif_core(cif, abi, 1, nfixedargs, ntotalargs, rtype, atypes);
237 ffi_prep_closure (ffi_closure* closure,
239 void (*fun)(ffi_cif*,void*,void**,void*),
242 return ffi_prep_closure_loc (closure, cif, fun, user_data, closure);