* tree.c (find_tree_t, find_tree): Remove.
[official-gcc.git] / gcc / vec.c
blobb6a1d7840885fc3ab19ce6e31f00127c9eb14e13
1 /* Vector API for GNU compiler.
2 Copyright (C) 2004, 2005 Free Software Foundation, Inc.
3 Contributed by Nathan Sidwell <nathan@codesourcery.com>
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
20 02110-1301, USA. */
22 #include "config.h"
23 #include "system.h"
24 #include "ggc.h"
25 #include "vec.h"
26 #include "coretypes.h"
27 #include "tree.h"
28 #include "toplev.h"
30 struct vec_prefix
32 unsigned num;
33 unsigned alloc;
34 void *vec[1];
37 /* Calculate the new ALLOC value, making sure that abs(RESERVE) slots
38 are free. If RESERVE < 0 grow exactly, otherwise grow
39 exponentially. */
41 static inline unsigned
42 calculate_allocation (const struct vec_prefix *pfx, int reserve)
44 unsigned alloc = 0;
45 unsigned num = 0;
47 if (pfx)
49 alloc = pfx->alloc;
50 num = pfx->num;
52 else if (!reserve)
53 /* If there's no prefix, and we've not requested anything, then we
54 will create a NULL vector. */
55 return 0;
57 /* We must have run out of room. */
58 gcc_assert (alloc - num < (unsigned)(reserve < 0 ? -reserve : reserve));
60 if (reserve < 0)
61 /* Exact size. */
62 alloc = num + -reserve;
63 else
65 /* Exponential growth. */
66 if (!alloc)
67 alloc = 4;
68 else if (alloc < 16)
69 /* Double when small. */
70 alloc = alloc * 2;
71 else
72 /* Grow slower when large. */
73 alloc = (alloc * 3 / 2);
75 /* If this is still too small, set it to the right size. */
76 if (alloc < num + reserve)
77 alloc = num + reserve;
79 return alloc;
82 /* Ensure there are at least abs(RESERVE) free slots in VEC. If
83 RESERVE < 0 grow exactly, else grow exponentially. As a special
84 case, if VEC is NULL, and RESERVE is 0, no vector will be created. */
86 void *
87 vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
89 return vec_gc_o_reserve (vec, reserve,
90 offsetof (struct vec_prefix, vec), sizeof (void *)
91 PASS_MEM_STAT);
94 /* As vec_gc_p_reserve, but for object vectors. The vector's trailing
95 array is at VEC_OFFSET offset and consists of ELT_SIZE sized
96 elements. */
98 void *
99 vec_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
100 MEM_STAT_DECL)
102 struct vec_prefix *pfx = vec;
103 unsigned alloc = alloc = calculate_allocation (pfx, reserve);
105 if (!alloc)
106 return NULL;
108 vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT);
109 ((struct vec_prefix *)vec)->alloc = alloc;
110 if (!pfx)
111 ((struct vec_prefix *)vec)->num = 0;
113 return vec;
116 /* As for vec_gc_p_reserve, but for heap allocated vectors. */
118 void *
119 vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
121 return vec_heap_o_reserve (vec, reserve,
122 offsetof (struct vec_prefix, vec), sizeof (void *)
123 PASS_MEM_STAT);
126 /* As for vec_gc_o_reserve, but for heap allocated vectors. */
128 void *
129 vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
130 MEM_STAT_DECL)
132 struct vec_prefix *pfx = vec;
133 unsigned alloc = calculate_allocation (pfx, reserve);
135 if (!alloc)
136 return NULL;
138 vec = xrealloc (vec, vec_offset + alloc * elt_size);
139 ((struct vec_prefix *)vec)->alloc = alloc;
140 if (!pfx)
141 ((struct vec_prefix *)vec)->num = 0;
143 return vec;
146 #if ENABLE_CHECKING
147 /* Issue a vector domain error, and then fall over. */
149 void
150 vec_assert_fail (const char *op, const char *struct_name,
151 const char *file, unsigned int line, const char *function)
153 internal_error ("vector %s %s domain error, in %s at %s:%u",
154 struct_name, op, function, trim_filename (file), line);
156 #endif