2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
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7 * http://www.apache.org/licenses/LICENSE-2.0
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12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
18 Permission is hereby granted, free of charge, to any person obtaining
19 a copy of this software and associated documentation files (the
20 "Software"), to deal in the Software without restriction, including
21 without limitation the rights to use, copy, modify, merge, publish,
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23 permit persons to whom the Software is furnished to do so, subject to
24 the following conditions:
26 The above copyright notice and this permission notice shall be
27 included in all copies or substantial portions of the Software.
29 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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38 #ifndef included_clib_vec_bootstrap_h
39 #define included_clib_vec_bootstrap_h
42 Vector bootstrap header file
45 /* Bootstrap include so that #include <vppinfra/mem.h> can include e.g.
46 <vppinfra/mheap.h> which depends on <vppinfra/vec.h>. */
48 /** \brief vector header structure
50 Bookkeeping header preceding vector elements in memory.
51 User header information may preceed standard vec header.
52 If you change u32 len -> u64 len, single vectors can
53 exceed 2**32 elements. Clib heaps are vectors. */
57 u32 len; /**< Number of elements in vector (NOT its allocated length). */
58 u8 hdr_size; /**< header size divided by VEC_MIN_ALIGN */
59 u8 log2_align : 7; /**< data alignment */
60 u8 default_heap : 1; /**< vector uses default heap */
61 u8 vpad[2]; /**< pad to 8 bytes */
62 u8 vector_data[0]; /**< Vector data . */
65 #define VEC_MIN_ALIGN 8
67 /** \brief Find the vector header
69 Given the user's pointer to a vector, find the corresponding
72 @param v pointer to a vector
73 @return pointer to the vector's vector_header_t
75 #define _vec_find(v) ((vec_header_t *) (v) - 1)
76 #define _vec_heap(v) (((void **) (_vec_find (v)))[-1])
78 always_inline uword __vec_align (uword data_align, uword configuered_align);
79 always_inline uword __vec_elt_sz (uword elt_sz, int is_void);
81 #define _vec_round_size(s) \
82 (((s) + sizeof (uword) - 1) &~ (sizeof (uword) - 1))
83 #define _vec_is_void(P) \
84 __builtin_types_compatible_p (__typeof__ ((P)[0]), void)
85 #define _vec_elt_sz(V) __vec_elt_sz (sizeof ((V)[0]), _vec_is_void (V))
86 #define _vec_align(V, A) __vec_align (__alignof__((V)[0]), A)
88 always_inline CLIB_NOSANITIZE_ADDR uword
89 vec_get_header_size (void *v)
91 uword header_size = _vec_find (v)->hdr_size * VEC_MIN_ALIGN;
95 /** \brief Find a user vector header
97 Finds the user header of a vector with unspecified alignment given
98 the user pointer to the vector.
104 return v ? v - vec_get_header_size (v) : 0;
107 /** \brief Find the end of user vector header
109 Finds the end of the user header of a vector with unspecified
110 alignment given the user pointer to the vector.
114 vec_header_end (void *v)
116 return v + vec_get_header_size (v);
119 /** \brief Number of elements in vector (rvalue-only, NULL tolerant)
121 vec_len (v) checks for NULL, but cannot be used as an lvalue.
122 If in doubt, use vec_len...
125 static_always_inline u32
128 return _vec_find (v)->len;
131 #define _vec_len(v) __vec_len ((void *) (v))
132 #define vec_len(v) ((v) ? _vec_len(v) : 0)
134 u32 vec_len_not_inline (void *v);
136 /** \brief Number of data bytes in vector. */
138 #define vec_bytes(v) (vec_len (v) * sizeof (v[0]))
141 * Return size of memory allocated for the vector
144 * @return memory size allocated for the vector
147 uword vec_mem_size (void *v);
150 * Number of elements that can fit into generic vector
153 * @param b extra header bytes
154 * @return number of elements that can fit into vector
158 vec_max_bytes (void *v)
160 return v ? vec_mem_size (v) - vec_get_header_size (v) : 0;
164 _vec_max_len (void *v, uword elt_sz)
166 return vec_max_bytes (v) / elt_sz;
169 #define vec_max_len(v) _vec_max_len (v, _vec_elt_sz (v))
172 _vec_set_len (void *v, uword len, uword elt_sz)
175 ASSERT (len <= _vec_max_len (v, elt_sz));
176 uword old_len = _vec_len (v);
179 CLIB_MEM_UNPOISON (v + old_len * elt_sz, (len - old_len) * elt_sz);
180 else if (len > old_len)
181 CLIB_MEM_POISON (v + len * elt_sz, (old_len - len) * elt_sz);
183 _vec_find (v)->len = len;
186 #define vec_set_len(v, l) _vec_set_len ((void *) v, l, _vec_elt_sz (v))
187 #define vec_inc_len(v, l) vec_set_len (v, _vec_len (v) + (l))
188 #define vec_dec_len(v, l) vec_set_len (v, _vec_len (v) - (l))
190 /** \brief Reset vector length to zero
191 NULL-pointer tolerant
193 #define vec_reset_length(v) do { if (v) vec_set_len (v, 0); } while (0)
195 /** \brief End (last data address) of vector. */
196 #define vec_end(v) ((v) + vec_len (v))
198 /** \brief True if given pointer is within given vector. */
199 #define vec_is_member(v,e) ((e) >= (v) && (e) < vec_end (v))
201 /** \brief Get vector value at index i checking that i is in bounds. */
202 #define vec_elt_at_index(v,i) \
204 ASSERT ((i) < vec_len (v)); \
208 /** \brief Get vector value at index i */
209 #define vec_elt(v,i) (vec_elt_at_index(v,i))[0]
211 /** \brief Vector iterator */
212 #define vec_foreach(var,vec) for (var = (vec); var < vec_end (vec); var++)
214 /** \brief Vector iterator (reverse) */
215 #define vec_foreach_backwards(var, vec) \
217 for (var = vec_end (vec) - 1; var >= (vec); var--)
219 /** \brief Iterate over vector indices. */
220 #define vec_foreach_index(var,v) for ((var) = 0; (var) < vec_len (v); (var)++)
222 /** \brief Iterate over vector indices (reverse). */
223 #define vec_foreach_index_backwards(var, v) \
225 for ((var) = vec_len ((v)) - 1; (var) >= 0; (var)--)
227 #endif /* included_clib_vec_bootstrap_h */
230 * fd.io coding-style-patch-verification: ON
233 * eval: (c-set-style "gnu")