Ensure that users don't include ffitarget.h directly
[libffi.git] / .pc / variadic / src / prep_cif.c
1 /* -----------------------------------------------------------------------
2 prep_cif.c - Copyright (c) 2011, 2012 Anthony Green
3 Copyright (c) 1996, 1998, 2007 Red Hat, Inc.
4
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:
12
13 The above copyright notice and this permission notice shall be included
14 in all copies or substantial portions of the Software.
15
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 ----------------------------------------------------------------------- */
25
26 #include <ffi.h>
27 #include <ffi_common.h>
28 #include <stdlib.h>
29
30 /* Round up to FFI_SIZEOF_ARG. */
31
32 #define STACK_ARG_SIZE(x) ALIGN(x, FFI_SIZEOF_ARG)
33
34 /* Perform machine independent initialization of aggregate type
35 specifications. */
36
37 static ffi_status initialize_aggregate(ffi_type *arg)
38 {
39 ffi_type **ptr;
40
41 if (UNLIKELY(arg == NULL || arg->elements == NULL))
42 return FFI_BAD_TYPEDEF;
43
44 arg->size = 0;
45 arg->alignment = 0;
46
47 ptr = &(arg->elements[0]);
48
49 if (UNLIKELY(ptr == 0))
50 return FFI_BAD_TYPEDEF;
51
52 while ((*ptr) != NULL)
53 {
54 if (UNLIKELY(((*ptr)->size == 0)
55 && (initialize_aggregate((*ptr)) != FFI_OK)))
56 return FFI_BAD_TYPEDEF;
57
58 /* Perform a sanity check on the argument type */
59 FFI_ASSERT_VALID_TYPE(*ptr);
60
61 arg->size = ALIGN(arg->size, (*ptr)->alignment);
62 arg->size += (*ptr)->size;
63
64 arg->alignment = (arg->alignment > (*ptr)->alignment) ?
65 arg->alignment : (*ptr)->alignment;
66
67 ptr++;
68 }
69
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);
78
79 if (arg->size == 0)
80 return FFI_BAD_TYPEDEF;
81 else
82 return FFI_OK;
83 }
84
85 #ifndef __CRIS__
86 /* The CRIS ABI specifies structure elements to have byte
87 alignment only, so it completely overrides this functions,
88 which assumes "natural" alignment and padding. */
89
90 /* Perform machine independent ffi_cif preparation, then call
91 machine dependent routine. */
92
93 ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs,
94 ffi_type *rtype, ffi_type **atypes)
95 {
96 unsigned bytes = 0;
97 unsigned int i;
98 ffi_type **ptr;
99
100 FFI_ASSERT(cif != NULL);
101 #ifndef X86_WIN32
102 if (! (abi > FFI_FIRST_ABI) && (abi <= FFI_LAST_ABI))
103 return FFI_BAD_ABI;
104 #else
105 if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI || abi == FFI_THISCALL))
106 return FFI_BAD_ABI;
107 #endif
108
109 cif->abi = abi;
110 cif->arg_types = atypes;
111 cif->nargs = nargs;
112 cif->rtype = rtype;
113
114 cif->flags = 0;
115
116 /* Initialize the return type if necessary */
117 if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
118 return FFI_BAD_TYPEDEF;
119
120 /* Perform a sanity check on the return type */
121 FFI_ASSERT_VALID_TYPE(cif->rtype);
122
123 /* x86, x86-64 and s390 stack space allocation is handled in prep_machdep. */
124 #if !defined M68K && !defined X86_ANY && !defined S390 && !defined PA
125 /* Make space for the return structure pointer */
126 if (cif->rtype->type == FFI_TYPE_STRUCT
127 #ifdef SPARC
128 && (cif->abi != FFI_V9 || cif->rtype->size > 32)
129 #endif
130 )
131 bytes = STACK_ARG_SIZE(sizeof(void*));
132 #endif
133
134 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
135 {
136
137 /* Initialize any uninitialized aggregate type definitions */
138 if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
139 return FFI_BAD_TYPEDEF;
140
141 /* Perform a sanity check on the argument type, do this
142 check after the initialization. */
143 FFI_ASSERT_VALID_TYPE(*ptr);
144
145 #if !defined X86_ANY && !defined S390 && !defined PA
146 #ifdef SPARC
147 if (((*ptr)->type == FFI_TYPE_STRUCT
148 && ((*ptr)->size > 16 || cif->abi != FFI_V9))
149 || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
150 && cif->abi != FFI_V9))
151 bytes += sizeof(void*);
152 else
153 #endif
154 {
155 /* Add any padding if necessary */
156 if (((*ptr)->alignment - 1) & bytes)
157 bytes = ALIGN(bytes, (*ptr)->alignment);
158
159 bytes += STACK_ARG_SIZE((*ptr)->size);
160 }
161 #endif
162 }
163
164 cif->bytes = bytes;
165
166 /* Perform machine dependent cif processing */
167 return ffi_prep_cif_machdep(cif);
168 }
169 #endif /* not __CRIS__ */
170
171 #if FFI_CLOSURES
172
173 ffi_status
174 ffi_prep_closure (ffi_closure* closure,
175 ffi_cif* cif,
176 void (*fun)(ffi_cif*,void*,void**,void*),
177 void *user_data)
178 {
179 return ffi_prep_closure_loc (closure, cif, fun, user_data, closure);
180 }
181
182 #endif