1 files changed, 387 insertions, 0 deletions
diff --git a/libbanshee/libcompat/regions.c b/libbanshee/libcompat/regions.c
new file mode 100644
index 00000000000..6426fd68d1e
--- /dev/null
+++ b/libbanshee/libcompat/regions.c
@@ -0,0 +1,387 @@
+/*
+ * Copyright (c) 1999-2001
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+/* Idea: clear on page alloc rather than individual alloc
+   Turns out not so good (on lcc at least, seems a wash on mudlle):
+   logically should be bad for small regions (less than a few pages)
+*/
+#undef PRECLEAR
+#undef REGION_PROFILE
+#include "regions.h"
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include "radix-tree.h"
+#define RPAGESIZE (1 << RPAGELOG)
+#define PAGE_GROUP_SIZE 32
+#define K 4
+#define MAXPAGE (1 << (32 - RPAGELOG))
+
+#define PAGENB(x) ((__rcintptr)(x) >> RPAGELOG)
+
+#define ALIGN(x, n) (((x) + ((n) - 1)) & ~((n) - 1))
+#define PALIGN(x, n) ((void *)ALIGN((__rcintptr)(x), n))
+#ifdef __GNUC__
+#define RALIGNMENT __alignof(double)
+#define PTRALIGNMENT __alignof(void *)
+#define ALIGNMENT_LONG __alignof(unsigned long)
+#else
+#define RALIGNMENT 8
+#define PTRALIGNMENT 4
+#define ALIGNMENT_LONG 4
+#endif
+
+typedef unsigned long __rcintptr;
+
+struct ablock {
+  char *base, *allocfrom;
+};
+
+struct allocator {
+  struct ablock page;
+  struct ablock superpage;
+  struct ablock hyperpage;
+  struct page *pages;
+  struct page *bigpages;
+};
+
+struct Region {
+  struct allocator normal;
+  struct Region *parent, *sibling, *children;
+};
+
+nomem_handler nomem_h;
+
+/* dummy region for NULL and malloc memory */
+struct Region zeroregion;
+
+static void clear(void *start, __rcintptr size)
+{
+  long *clear, *clearend;
+
+  clear = (long *)start;
+  clearend = (long *)((char *)start + size);
+  do *clear++ = 0;
+  while (clear < clearend) ;
+}
+
+#ifdef PRECLEAR
+#define preclear clear
+#define postclear(s, e)
+#else
+#define preclear(s, e)
+#define postclear clear
+#endif
+
+#include "pages.c"
+#include "alloc.c"
+
+static void nochildren(region r)
+{
+  if (r->children)
+    abort();
+}
+
+static void unlink_region(region r)
+{
+  region *scan;
+
+  scan = &r->parent->children;
+  while (*scan != r)
+    scan = &(*scan)->sibling;
+  *scan = (*scan)->sibling;
+}
+
+static void link_region(region r, region parent)
+{
+  r->sibling = parent->children;
+  r->parent = parent;
+  parent->children = r;
+}
+
+static int rstart;
+
+void initregion(region r)
+{
+  char *first =
+    (char *)r - rstart - offsetof(struct page, previous);
+
+  /* Start using page with region header as a pointer-containing page */
+  r->normal.page.base = first;
+  r->normal.page.allocfrom = (char *)(r + 1);
+
+  /* Guarantee failure for all other blocks */
+  r->normal.superpage.allocfrom = (char *)(K * RPAGESIZE + 1);
+  r->normal.hyperpage.allocfrom = (char *)(K * K * RPAGESIZE + 1);
+
+  /* Remember that r owns this page. */
+  r->normal.pages = (struct page *)first;
+  set_region(r->normal.pages, 1, r);
+}
+
+region newregion(void)
+{
+  return newsubregion(&zeroregion);
+}
+
+region newsubregion(region parent)
+{
+  char *first;
+  region r;
+
+  first = (char *)alloc_single_page(NULL);
+  preclear(first + offsetof(struct page, pagecount), RPAGESIZE - offsetof(struct page, pagecount));
+
+  /* stagger regions across cache lines a bit */
+  rstart += 64;
+  if (rstart > RPAGESIZE / K) rstart = 0;
+  r = (region)(first + rstart + offsetof(struct page, previous));
+  postclear(r, sizeof *r);
+  initregion(r);
+
+  link_region(r, parent);
+
+  return r;
+}
+
+void *typed_ralloc(region r, size_t size, type_t t)
+{
+  return rstralloc0(r, size);
+}
+
+void *typed_rarrayextend(region r, void *old, size_t n, size_t size, type_t t)
+{
+  return rstrextend0(r, old, n * size);
+}
+
+void *typed_rarrayalloc(region r, size_t n, size_t size, type_t t)
+{
+  return typed_ralloc(r, n * size, t);
+}
+
+char *rstralloc(region r, size_t size)
+{
+  void *mem, *dummy;
+
+  qalloc(r, &r->normal, &dummy, 0, 1, &mem, size, RALIGNMENT, 0);
+
+  return mem;
+}
+
+char *rstralloc0(region r, size_t size)
+{
+  char *mem;
+
+  mem = rstralloc(r, size);
+  clear(mem, size);
+
+  return mem;
+}
+
+char *rstrdup(region r, const char *s)
+{
+  char *news = rstralloc(r, strlen(s) + 1);
+
+  strcpy(news, s);
+
+  return news;
+}
+
+static char *internal_rstrextend(region r, const char *old, size_t newsize,
+				 int needsclear)
+{
+  /* For now we don't attempt to extend the old storage area */
+  void *newmem, *hdr;
+  unsigned long *oldhdr, oldsize;
+
+  qalloc(r, &r->normal, &hdr, sizeof(unsigned long), ALIGNMENT_LONG,
+	 &newmem, newsize, RALIGNMENT, 0);
+
+  /* If we don't do this we can't find the header: */
+  hdr = (char *)newmem - sizeof(unsigned long);
+
+  *(unsigned long *)hdr = newsize;
+
+  if (old)
+    {
+      oldhdr = (unsigned long *)(old - ALIGNMENT_LONG);
+      oldsize = *oldhdr;
+
+      if (oldsize > newsize)
+	oldsize = newsize;
+      else if (needsclear)
+	clear((char *) newmem + oldsize, newsize - oldsize);
+      memcpy(newmem, old, oldsize);
+    }
+  else if (needsclear)
+    clear(newmem, newsize);
+
+  return newmem;
+}
+
+char *rstrextend(region r, const char *old, size_t newsize)
+{
+  return internal_rstrextend(r, old, newsize, 0);
+}
+
+char *rstrextend0(region r, const char *old, size_t newsize)
+{
+  return internal_rstrextend(r, old, newsize, 1);
+}
+
+void typed_rarraycopy(void *to, void *from, size_t n, size_t size, type_t type)
+{
+  memcpy(to, from, n * size);
+}
+
+static void delregion(region r)
+{
+  nochildren(r);
+  free_all_pages(r, &r->normal);
+}
+
+void deleteregion(region r)
+{
+  unlink_region(r);
+  delregion(r);
+}
+
+void deleteregion_ptr(region *r)
+{
+  region tmp = *r;
+
+  *r = NULL;
+  deleteregion(tmp);
+}
+
+void deleteregion_array(int n, region *regions)
+{
+  int i;
+
+  for (i = 0; i < n; i++)
+    unlink_region(regions[i]);
+
+  for (i = 0; i < n; i++)
+    {
+      delregion(regions[i]);
+      regions[i] = NULL;
+    }
+}
+
+region regionof(void *ptr)
+{
+  return radix_tree_lookup (&__rcregionmap, (unsigned long)ptr >> RPAGELOG);
+}
+
+void region_init(void)
+{
+  static int initialized = 0;
+  radix_tree_init ();
+  if ( initialized )
+    return;
+  else
+    {
+      rstart = -64; /* Save 64 bytes of memory! (sometimes ;-)) */
+      init_pages();
+    }
+
+  initialized = 1;
+}
+
+nomem_handler set_nomem_handler(nomem_handler newhandler)
+{
+  nomem_handler oldh = nomem_h;
+
+  nomem_h = newhandler;
+
+  return oldh;
+}
+
+/*
+int region_main(int argc, char **argv, char **envp);
+
+int main(int argc, char **argv, char **envp)
+{
+  region_init();
+  return region_main(argc, argv, envp);
+}
+*/
+
+
+/* Debugging support */
+
+static FILE *out;
+
+static void printref(void *x)
+{
+/*  if (x >= (void *)__rcregionmap && x < (void *)&__rcregionmap[MAXPAGE])
+    return;
+*/
+#ifdef RCPAIRS
+  if (x >= (void *)__rcregions && x < (void *)&__rcregions[MAXREGIONS])
+    return;
+
+#endif
+
+  fprintf(out, "info symbol 0x%p\n", x);
+}
+
+void findrefs(region r, void *from, void *to)
+{
+  char *f;
+
+  if (!out)
+    out = fopen("/dev/tty", "w");
+
+  for (f = PALIGN(from, PTRALIGNMENT); f < (char *)to; f += PTRALIGNMENT)
+    if (regionof(*(void **)f) == r)
+      printref(f);
+
+  fflush(out);
+}
+
+#ifdef sparc
+extern void _DYNAMIC, _end;
+
+void findgrefs(region r)
+{
+  findrefs(r, &_DYNAMIC, &_end);
+}
+#endif
+
+void findrrefs(region r, region from)
+{
+  struct page *p;
+
+  for (p = from->normal.pages; p; p = p->next)
+    findrefs(r, (char *)&p->previous, (char *)p + RPAGESIZE);
+
+  for (p = r->normal.bigpages; p; p = p->next)
+    findrefs(r, (char *)&p->previous, (char *)p + p->pagecount * RPAGESIZE);
+}