157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* Vector API for GNU compiler.
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Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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Contributed by Nathan Sidwell <nathan@codesourcery.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "ggc.h"
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#include "vec.h"
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#include "coretypes.h"
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#include "tree.h"
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#include "toplev.h"
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struct vec_prefix
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{
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unsigned num;
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unsigned alloc;
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void *vec[1];
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};
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/* Calculate the new ALLOC value, making sure that abs(RESERVE) slots
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are free. If RESERVE < 0 grow exactly, otherwise grow
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exponentially. */
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static inline unsigned
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calculate_allocation (const struct vec_prefix *pfx, int reserve)
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{
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unsigned alloc = 0;
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unsigned num = 0;
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if (pfx)
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{
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alloc = pfx->alloc;
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num = pfx->num;
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}
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else if (!reserve)
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/* If there's no prefix, and we've not requested anything, then we
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will create a NULL vector. */
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return 0;
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/* We must have run out of room. */
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gcc_assert (alloc - num < (unsigned)(reserve < 0 ? -reserve : reserve));
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if (reserve < 0)
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/* Exact size. */
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alloc = num + -reserve;
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else
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{
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/* Exponential growth. */
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if (!alloc)
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alloc = 4;
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else if (alloc < 16)
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/* Double when small. */
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alloc = alloc * 2;
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else
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/* Grow slower when large. */
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alloc = (alloc * 3 / 2);
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/* If this is still too small, set it to the right size. */
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if (alloc < num + reserve)
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alloc = num + reserve;
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}
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return alloc;
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}
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/* Ensure there are at least abs(RESERVE) free slots in VEC. If
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RESERVE < 0 grow exactly, else grow exponentially. As a special
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case, if VEC is NULL, and RESERVE is 0, no vector will be created. */
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void *
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vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
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{
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return vec_gc_o_reserve (vec, reserve,
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offsetof (struct vec_prefix, vec), sizeof (void *)
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PASS_MEM_STAT);
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}
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/* As vec_gc_p_reserve, but for object vectors. The vector's trailing
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array is at VEC_OFFSET offset and consists of ELT_SIZE sized
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elements. */
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void *
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vec_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
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MEM_STAT_DECL)
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{
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struct vec_prefix *pfx = vec;
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unsigned alloc = alloc = calculate_allocation (pfx, reserve);
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if (!alloc)
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return NULL;
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vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT);
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((struct vec_prefix *)vec)->alloc = alloc;
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if (!pfx)
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((struct vec_prefix *)vec)->num = 0;
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return vec;
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}
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/* As for vec_gc_p_reserve, but for heap allocated vectors. */
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void *
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vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
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{
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return vec_heap_o_reserve (vec, reserve,
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offsetof (struct vec_prefix, vec), sizeof (void *)
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PASS_MEM_STAT);
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}
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/* As for vec_gc_o_reserve, but for heap allocated vectors. */
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void *
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vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
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MEM_STAT_DECL)
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{
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struct vec_prefix *pfx = vec;
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unsigned alloc = calculate_allocation (pfx, reserve);
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if (!alloc)
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return NULL;
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vec = xrealloc (vec, vec_offset + alloc * elt_size);
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((struct vec_prefix *)vec)->alloc = alloc;
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if (!pfx)
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((struct vec_prefix *)vec)->num = 0;
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return vec;
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}
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#if ENABLE_CHECKING
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/* Issue a vector domain error, and then fall over. */
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void
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vec_assert_fail (const char *op, const char *struct_name,
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const char *file, unsigned int line, const char *function)
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{
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internal_error ("vector %s %s domain error, in %s at %s:%u",
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struct_name, op, function, trim_filename (file), line);
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}
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#endif
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