1 /* -----------------------------------------------------------------------
2 prep_cif.c - Copyright (c) 1996, 1998, 2007 Red Hat, Inc.
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,
16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
23 ----------------------------------------------------------------------- */
24
25 #include <ffi.h>
26 #include <ffi_common.h>
27 #include <stdlib.h>
28
29 /* Round up to FFI_SIZEOF_ARG. */
30
31 #define STACK_ARG_SIZE(x) ALIGN(x, FFI_SIZEOF_ARG)
32
33 /* Perform machine independent initialization of aggregate type
34 specifications. */
35
initialize_aggregate(ffi_type * arg)36 static ffi_status initialize_aggregate(ffi_type *arg)
37 {
38 ffi_type **ptr;
39
40 FFI_ASSERT(arg != NULL);
41
42 FFI_ASSERT(arg->elements != NULL);
43 FFI_ASSERT(arg->size == 0);
44 FFI_ASSERT(arg->alignment == 0);
45
46 ptr = &(arg->elements[0]);
47
48 while ((*ptr) != NULL)
49 {
50 if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
51 return FFI_BAD_TYPEDEF;
52
53 /* Perform a sanity check on the argument type */
54 FFI_ASSERT_VALID_TYPE(*ptr);
55
56 arg->size = ALIGN(arg->size, (*ptr)->alignment);
57 arg->size += (*ptr)->size;
58
59 arg->alignment = (arg->alignment > (*ptr)->alignment) ?
60 arg->alignment : (*ptr)->alignment;
61
62 ptr++;
63 }
64
65 /* Structure size includes tail padding. This is important for
66 structures that fit in one register on ABIs like the PowerPC64
67 Linux ABI that right justify small structs in a register.
68 It's also needed for nested structure layout, for example
69 struct A { long a; char b; }; struct B { struct A x; char y; };
70 should find y at an offset of 2*sizeof(long) and result in a
71 total size of 3*sizeof(long). */
72 arg->size = ALIGN (arg->size, arg->alignment);
73
74 if (arg->size == 0)
75 return FFI_BAD_TYPEDEF;
76 else
77 return FFI_OK;
78 }
79
80 #ifndef __CRIS__
81 /* The CRIS ABI specifies structure elements to have byte
82 alignment only, so it completely overrides this functions,
83 which assumes "natural" alignment and padding. */
84
85 /* Perform machine independent ffi_cif preparation, then call
86 machine dependent routine. */
87
ffi_prep_cif(ffi_cif * cif,ffi_abi abi,unsigned int nargs,ffi_type * rtype,ffi_type ** atypes)88 ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs,
89 ffi_type *rtype, ffi_type **atypes)
90 {
91 unsigned bytes = 0;
92 unsigned int i;
93 ffi_type **ptr;
94
95 FFI_ASSERT(cif != NULL);
96 FFI_ASSERT((abi > FFI_FIRST_ABI) && (abi <= FFI_DEFAULT_ABI));
97
98 cif->abi = abi;
99 cif->arg_types = atypes;
100 cif->nargs = nargs;
101 cif->rtype = rtype;
102
103 cif->flags = 0;
104
105 /* Initialize the return type if necessary */
106 if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
107 return FFI_BAD_TYPEDEF;
108
109 /* Perform a sanity check on the return type */
110 FFI_ASSERT_VALID_TYPE(cif->rtype);
111
112 /* x86, x86-64 and s390 stack space allocation is handled in prep_machdep. */
113 #if !defined M68K && !defined __i386__ && !defined __x86_64__ && !defined S390 && !defined PA
114 /* Make space for the return structure pointer */
115 if (cif->rtype->type == FFI_TYPE_STRUCT
116 #ifdef SPARC
117 && (cif->abi != FFI_V9 || cif->rtype->size > 32)
118 #endif
119 )
120 bytes = STACK_ARG_SIZE(sizeof(void*));
121 #endif
122
123 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
124 {
125
126 /* Initialize any uninitialized aggregate type definitions */
127 if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
128 return FFI_BAD_TYPEDEF;
129
130 /* Perform a sanity check on the argument type, do this
131 check after the initialization. */
132 FFI_ASSERT_VALID_TYPE(*ptr);
133
134 #if !defined __i386__ && !defined __x86_64__ && !defined S390 && !defined PA
135 #ifdef SPARC
136 if (((*ptr)->type == FFI_TYPE_STRUCT
137 && ((*ptr)->size > 16 || cif->abi != FFI_V9))
138 || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
139 && cif->abi != FFI_V9))
140 bytes += sizeof(void*);
141 else
142 #endif
143 {
144 /* Add any padding if necessary */
145 if (((*ptr)->alignment - 1) & bytes)
146 bytes = ALIGN(bytes, (*ptr)->alignment);
147
148 bytes += STACK_ARG_SIZE((*ptr)->size);
149 }
150 #endif
151 }
152
153 cif->bytes = bytes;
154
155 /* Perform machine dependent cif processing */
156 return ffi_prep_cif_machdep(cif);
157 }
158 #endif /* not __CRIS__ */
159
160 #if FFI_CLOSURES
161
162 ffi_status
ffi_prep_closure(ffi_closure * closure,ffi_cif * cif,void (* fun)(ffi_cif *,void *,void **,void *),void * user_data)163 ffi_prep_closure (ffi_closure* closure,
164 ffi_cif* cif,
165 void (*fun)(ffi_cif*,void*,void**,void*),
166 void *user_data)
167 {
168 return ffi_prep_closure_loc (closure, cif, fun, user_data, closure);
169 }
170
171 #endif
172