* configure.ac: Bump version to 2.99.7.
[libffi.git] / libffi / src / prep_cif.c
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
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
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 /* x86-64 and s390 stack space allocation is handled in prep_machdep. */
113 #if !defined M68K && !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 #ifdef X86_DARWIN
120 && (cif->rtype->size > 8)
121 #endif
122 )
123 bytes = STACK_ARG_SIZE(sizeof(void*));
124 #endif
125
126 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
127 {
128
129 /* Initialize any uninitialized aggregate type definitions */
130 if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
131 return FFI_BAD_TYPEDEF;
132
133 /* Perform a sanity check on the argument type, do this
134 check after the initialization. */
135 FFI_ASSERT_VALID_TYPE(*ptr);
136
137 #if !defined __x86_64__ && !defined S390 && !defined PA
138 #ifdef SPARC
139 if (((*ptr)->type == FFI_TYPE_STRUCT
140 && ((*ptr)->size > 16 || cif->abi != FFI_V9))
141 || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
142 && cif->abi != FFI_V9))
143 bytes += sizeof(void*);
144 else
145 #endif
146 {
147 /* Add any padding if necessary */
148 if (((*ptr)->alignment - 1) & bytes)
149 bytes = ALIGN(bytes, (*ptr)->alignment);
150
151 bytes += STACK_ARG_SIZE((*ptr)->size);
152 }
153 #endif
154 }
155
156 cif->bytes = bytes;
157
158 /* Perform machine dependent cif processing */
159 return ffi_prep_cif_machdep(cif);
160 }
161 #endif /* not __CRIS__ */
162
163 #if FFI_CLOSURES
164
165 ffi_status
166 ffi_prep_closure (ffi_closure* closure,
167 ffi_cif* cif,
168 void (*fun)(ffi_cif*,void*,void**,void*),
169 void *user_data)
170 {
171 return ffi_prep_closure_loc (closure, cif, fun, user_data, closure);
172 }
173
174 #endif