105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/* Vector API for GNU compiler.
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Copyright (C) 2004 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, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, 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 "errors.h"
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#include "coretypes.h"
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#include "tree.h"
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struct vec_prefix
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{
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size_t num;
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size_t alloc;
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void *vec[1];
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};
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/* Ensure there are at least RESERVE free slots in VEC, if RESERVE !=
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~0u. If RESERVE == ~0u increase the current allocation
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exponentially. VEC can be NULL, to create a new vector. */
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void *
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vec_p_reserve (void *vec, size_t reserve)
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{
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return vec_o_reserve (vec, reserve,
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offsetof (struct vec_prefix, vec), sizeof (void *));
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}
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/* Ensure there are at least RESERVE free slots in VEC, if RESERVE !=
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~0u. If RESERVE == ~0u, increase the current allocation
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exponentially. VEC can be NULL, in which case a new vector is
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created. The vector's trailing array is at VEC_OFFSET offset and
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consistes of ELT_SIZE sized elements. */
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void *
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vec_o_reserve (void *vec, size_t reserve, size_t vec_offset, size_t elt_size)
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{
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struct vec_prefix *pfx = vec;
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size_t alloc;
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if (reserve + 1)
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alloc = (pfx ? pfx->num : 0) + reserve;
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else
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alloc = pfx ? pfx->alloc * 2 : 4;
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if (!pfx || pfx->alloc < alloc)
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{
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vec = ggc_realloc (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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}
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return vec;
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}
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/* Allocate a structure which contains a vector as a trailing element.
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The vector is at STRUCT_OFFSET offset within the struct and the
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vector's array is at VEC_OFFSET offset within the vector. */
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void *
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vec_embedded_alloc (size_t struct_offset, size_t vec_offset,
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size_t elt_size, size_t reserve)
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{
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void *ptr = ggc_alloc (struct_offset + vec_offset + elt_size * reserve);
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struct vec_prefix *pfx = (struct vec_prefix *)((char *)ptr + struct_offset);
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pfx->num = 0;
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pfx->alloc = reserve;
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return ptr;
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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, size_t 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, function,
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trim_filename (file), line);
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}
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#endif
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