util: import u_debug_refcnt, u_hash_table, u_debug_describe from gallium

to allow pipe_*_reference to be called in src/mesa/vbo.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13050>

src/util/u_hash_table.c

@@ -0,0 +1,121 @@
+/**************************************************************************
+ *
+ * Copyright 2008 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "util/u_pointer.h"
+#include "util/u_hash_table.h"
+
+#if DETECT_OS_UNIX
+#include <sys/stat.h>
+#endif
+
+
+static uint32_t
+pointer_hash(const void *key)
+{
+   return _mesa_hash_pointer(key);
+}
+
+
+static bool
+pointer_equal(const void *a, const void *b)
+{
+   return a == b;
+}
+
+
+struct hash_table *
+util_hash_table_create_ptr_keys(void)
+{
+   return _mesa_hash_table_create(NULL, pointer_hash, pointer_equal);
+}
+
+
+static uint32_t hash_fd(const void *key)
+{
+#if DETECT_OS_UNIX
+   int fd = pointer_to_intptr(key);
+   struct stat stat;
+
+   fstat(fd, &stat);
+
+   return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
+#else
+   return 0;
+#endif
+}
+
+
+static bool equal_fd(const void *key1, const void *key2)
+{
+#if DETECT_OS_UNIX
+   int fd1 = pointer_to_intptr(key1);
+   int fd2 = pointer_to_intptr(key2);
+   struct stat stat1, stat2;
+
+   fstat(fd1, &stat1);
+   fstat(fd2, &stat2);
+
+   return stat1.st_dev == stat2.st_dev &&
+          stat1.st_ino == stat2.st_ino &&
+          stat1.st_rdev == stat2.st_rdev;
+#else
+   return 0;
+#endif
+}
+
+
+struct hash_table *
+util_hash_table_create_fd_keys(void)
+{
+   return _mesa_hash_table_create(NULL, hash_fd, equal_fd);
+}
+
+
+void *
+util_hash_table_get(struct hash_table *ht,
+                    void *key)
+{
+   struct hash_entry *entry = _mesa_hash_table_search(ht, key);
+
+   return entry ? entry->data : NULL;
+}
+
+
+enum pipe_error
+util_hash_table_foreach(struct hash_table *ht,
+                        enum pipe_error (*callback)
+                        (void *key, void *value, void *data),
+                        void *data)
+{
+   hash_table_foreach(ht, entry) {
+      enum pipe_error error = callback((void*)entry->key, entry->data, data);
+      if (error != PIPE_OK)
+         return error;
+   }
+   return PIPE_OK;
+}