Imported gcc-4.4.3

[msp430-gcc.git] / gmp / tal-notreent.c

diff --git a/gmp/tal-notreent.c b/gmp/tal-notreent.c
new file mode 100644 (file)
index 0000000..662d4ea
--- /dev/null
+++ b/gmp/tal-notreent.c
@@ -0,0 +1,119 @@
+/* Stack allocation routines.  This is intended for machines without support
+   for the `alloca' function.
+
+Copyright 1996, 1997, 1999, 2000, 2001, 2006 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+struct tmp_stack
+{
+  void *end;
+  void *alloc_point;
+  struct tmp_stack *prev;
+};
+typedef struct tmp_stack tmp_stack;
+
+
+static unsigned long max_total_allocation = 0;
+static unsigned long current_total_allocation = 0;
+
+static tmp_stack xxx = {&xxx, &xxx, 0};
+static tmp_stack *current = &xxx;
+
+/* The rounded size of the header of each allocation block.  */
+#define HSIZ   ROUND_UP_MULTIPLE (sizeof (tmp_stack), __TMP_ALIGN)
+
+
+/* Allocate a block of exactly <size> bytes.  This should only be called
+   through the TMP_ALLOC macro, which takes care of rounding/alignment.  */
+void *
+__gmp_tmp_alloc (unsigned long size)
+{
+  void *that;
+
+  ASSERT ((size % __TMP_ALIGN) == 0);
+  ASSERT (((unsigned) current->alloc_point % __TMP_ALIGN) == 0);
+
+  if (size > (char *) current->end - (char *) current->alloc_point)
+    {
+      void *chunk;
+      tmp_stack *header;
+      unsigned long chunk_size;
+      unsigned long now;
+
+      /* Allocate a chunk that makes the total current allocation somewhat
+        larger than the maximum allocation ever.  If size is very large, we
+        allocate that much.  */
+
+      now = current_total_allocation + size;
+      if (now > max_total_allocation)
+       {
+         /* We need more temporary memory than ever before.  Increase
+            for future needs.  */
+         now = (now * 3 / 2 + __TMP_ALIGN - 1) & -__TMP_ALIGN;
+         chunk_size = now - current_total_allocation + HSIZ;
+         current_total_allocation = now;
+         max_total_allocation = current_total_allocation;
+       }
+      else
+       {
+         chunk_size = max_total_allocation - current_total_allocation + HSIZ;
+         current_total_allocation = max_total_allocation;
+       }
+
+      chunk = (*__gmp_allocate_func) (chunk_size);
+      header = (tmp_stack *) chunk;
+      header->end = (char *) chunk + chunk_size;
+      header->alloc_point = (char *) chunk + HSIZ;
+      header->prev = current;
+      current = header;
+    }
+
+  that = current->alloc_point;
+  current->alloc_point = (char *) that + size;
+  ASSERT (((unsigned) that % __TMP_ALIGN) == 0);
+  return that;
+}
+
+/* Typically called at function entry.  <mark> is assigned so that
+   __gmp_tmp_free can later be used to reclaim all subsequently allocated
+   storage.  */
+void
+__gmp_tmp_mark (struct tmp_marker *mark)
+{
+  mark->which_chunk = current;
+  mark->alloc_point = current->alloc_point;
+}
+
+/* Free everything allocated since <mark> was assigned by __gmp_tmp_mark */
+void
+__gmp_tmp_free (struct tmp_marker *mark)
+{
+  while (mark->which_chunk != current)
+    {
+      tmp_stack *tmp;
+
+      tmp = current;
+      current = tmp->prev;
+      current_total_allocation -= (((char *) (tmp->end) - (char *) tmp) - HSIZ);
+      (*__gmp_free_func) (tmp, (char *) tmp->end - (char *) tmp);
+    }
+  current->alloc_point = mark->alloc_point;
+}