/* Vector API for GNU compiler.
- Copyright (C) 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
Contributed by Nathan Sidwell <nathan@codesourcery.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
-
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+/* This file is compiled twice: once for the generator programs
+ once for the compiler. */
+#ifdef GENERATOR_FILE
+#include "bconfig.h"
+#else
#include "config.h"
+#endif
+
#include "system.h"
#include "ggc.h"
#include "vec.h"
-#include "errors.h"
#include "coretypes.h"
-#include "tree.h"
+#include "toplev.h"
struct vec_prefix
{
void *vec[1];
};
-/* Ensure there are at least RESERVE free slots in VEC, if RESERVE >=
- 0. If RESERVE < 0 increase the current allocation exponentially.
- VEC can be NULL, to create a new vector. */
+/* Calculate the new ALLOC value, making sure that RESERVE slots are
+ free. If EXACT grow exactly, otherwise grow exponentially. */
-void *
-vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
+static inline unsigned
+calculate_allocation (const struct vec_prefix *pfx, int reserve, bool exact)
{
- return vec_gc_o_reserve (vec, reserve,
- offsetof (struct vec_prefix, vec), sizeof (void *)
- PASS_MEM_STAT);
+ unsigned alloc = 0;
+ unsigned num = 0;
+
+ gcc_assert (reserve >= 0);
+
+ if (pfx)
+ {
+ alloc = pfx->alloc;
+ num = pfx->num;
+ }
+ else if (!reserve)
+ /* If there's no prefix, and we've not requested anything, then we
+ will create a NULL vector. */
+ return 0;
+
+ /* We must have run out of room. */
+ gcc_assert (alloc - num < (unsigned) reserve);
+
+ if (exact)
+ /* Exact size. */
+ alloc = num + reserve;
+ else
+ {
+ /* Exponential growth. */
+ if (!alloc)
+ alloc = 4;
+ else if (alloc < 16)
+ /* Double when small. */
+ alloc = alloc * 2;
+ else
+ /* Grow slower when large. */
+ alloc = (alloc * 3 / 2);
+
+ /* If this is still too small, set it to the right size. */
+ if (alloc < num + reserve)
+ alloc = num + reserve;
+ }
+ return alloc;
}
-/* Ensure there are at least RESERVE free slots in VEC, if RESERVE >=
- 0. If RESERVE < 0, increase the current allocation exponentially.
- VEC can be NULL, in which case a new vector is created. The
- vector's trailing array is at VEC_OFFSET offset and consists of
- ELT_SIZE sized elements. */
+/* Ensure there are at least RESERVE free slots in VEC. If EXACT grow
+ exactly, else grow exponentially. As a special case, if VEC is
+ NULL and RESERVE is 0, no vector will be created. The vector's
+ trailing array is at VEC_OFFSET offset and consists of ELT_SIZE
+ sized elements. */
-void *
-vec_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
- MEM_STAT_DECL)
+static void *
+vec_gc_o_reserve_1 (void *vec, int reserve, size_t vec_offset, size_t elt_size,
+ bool exact MEM_STAT_DECL)
{
struct vec_prefix *pfx = vec;
- unsigned alloc = pfx ? pfx->num : 0;
-
- if (reserve >= 0)
- alloc += reserve;
- else if (alloc)
- alloc *= 2;
- else
- alloc = 4;
-
- gcc_assert (!pfx || pfx->alloc < alloc);
+ unsigned alloc = alloc = calculate_allocation (pfx, reserve, exact);
+
+ if (!alloc)
+ return NULL;
vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT);
((struct vec_prefix *)vec)->alloc = alloc;
return vec;
}
-/* Explicitly release a vector. */
+/* Ensure there are at least RESERVE free slots in VEC, growing
+ exponentially. If RESERVE < 0 grow exactly, else grow
+ exponentially. As a special case, if VEC is NULL, and RESERVE is
+ 0, no vector will be created. */
-void
-vec_gc_free (void *vec)
+void *
+vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
{
- ggc_free (vec);
+ return vec_gc_o_reserve_1 (vec, reserve,
+ offsetof (struct vec_prefix, vec),
+ sizeof (void *), false
+ PASS_MEM_STAT);
}
-/* Ensure there are at least RESERVE free slots in VEC, if RESERVE >=
- 0. If RESERVE < 0 increase the current allocation exponentially.
- VEC can be NULL, to create a new vector. */
+/* Ensure there are at least RESERVE free slots in VEC, growing
+ exactly. If RESERVE < 0 grow exactly, else grow exponentially. As
+ a special case, if VEC is NULL, and RESERVE is 0, no vector will be
+ created. */
void *
-vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
+vec_gc_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
+{
+ return vec_gc_o_reserve_1 (vec, reserve,
+ offsetof (struct vec_prefix, vec),
+ sizeof (void *), true
+ PASS_MEM_STAT);
+}
+
+/* As for vec_gc_p_reserve, but for object vectors. The vector's
+ trailing array is at VEC_OFFSET offset and consists of ELT_SIZE
+ sized elements. */
+
+void *
+vec_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
+ MEM_STAT_DECL)
{
- return vec_heap_o_reserve (vec, reserve,
- offsetof (struct vec_prefix, vec), sizeof (void *)
+ return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
PASS_MEM_STAT);
}
-/* Ensure there are at least RESERVE free slots in VEC, if RESERVE >=
- 0. If RESERVE < 0, increase the current allocation exponentially.
- VEC can be NULL, in which case a new vector is created. The
+/* As for vec_gc_p_reserve_exact, but for object vectors. The
vector's trailing array is at VEC_OFFSET offset and consists of
ELT_SIZE sized elements. */
void *
-vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
- MEM_STAT_DECL)
+vec_gc_o_reserve_exact (void *vec, int reserve, size_t vec_offset,
+ size_t elt_size MEM_STAT_DECL)
{
- struct vec_prefix *pfx = vec;
- unsigned alloc = pfx ? pfx->num : 0;
+ return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
+ PASS_MEM_STAT);
+}
- if (reserve >= 0)
- alloc += reserve;
- else if (alloc)
- alloc *= 2;
- else
- alloc = 4;
+/* As for vec_gc_o_reserve_1, but for heap allocated vectors. */
+
+static void *
+vec_heap_o_reserve_1 (void *vec, int reserve, size_t vec_offset,
+ size_t elt_size, bool exact MEM_STAT_DECL)
+{
+ struct vec_prefix *pfx = vec;
+ unsigned alloc = calculate_allocation (pfx, reserve, exact);
- gcc_assert (!pfx || pfx->alloc < alloc);
+ if (!alloc)
+ return NULL;
vec = xrealloc (vec, vec_offset + alloc * elt_size);
((struct vec_prefix *)vec)->alloc = alloc;
return vec;
}
-/* Explicitly release a vector. */
+/* As for vec_gc_p_reserve, but for heap allocated vectors. */
-void
-vec_heap_free (void *vec)
+void *
+vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
+{
+ return vec_heap_o_reserve_1 (vec, reserve,
+ offsetof (struct vec_prefix, vec),
+ sizeof (void *), false
+ PASS_MEM_STAT);
+}
+
+/* As for vec_gc_p_reserve_exact, but for heap allocated vectors. */
+
+void *
+vec_heap_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
+{
+ return vec_heap_o_reserve_1 (vec, reserve,
+ offsetof (struct vec_prefix, vec),
+ sizeof (void *), true
+ PASS_MEM_STAT);
+}
+
+/* As for vec_gc_o_reserve, but for heap allocated vectors. */
+
+void *
+vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
+ MEM_STAT_DECL)
+{
+ return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
+ PASS_MEM_STAT);
+}
+
+/* As for vec_gc_o_reserve_exact, but for heap allocated vectors. */
+
+void *
+vec_heap_o_reserve_exact (void *vec, int reserve, size_t vec_offset,
+ size_t elt_size MEM_STAT_DECL)
{
- free (vec);
+ return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
+ PASS_MEM_STAT);
}
#if ENABLE_CHECKING
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