util: add vector util code.

This is ported from anv, both anv and radv can share this.

Reviewed-by: Nicolai Hähnle <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

1 files changed, 92 insertions, 0 deletions

diff --git a/src/util/u_vector.h b/src/util/u_vector.h
new file mode 100644
index 00000000000..8fa4ec483c9
--- /dev/null
+++ b/src/util/u_vector.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/* 
+ * u_vector is a vector based queue for storing arbitrary
+ * sized arrays of objects without using a linked list.
+ */
+
+#ifndef U_VECTOR_H
+#define U_VECTOR_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include "util/u_math.h"
+#include "util/macros.h"
+
+/* TODO - move to u_math.h - name it better etc */
+static inline uint32_t
+u_align_u32(uint32_t v, uint32_t a)
+{
+   assert(a != 0 && a == (a & -a));
+   return (v + a - 1) & ~(a - 1);
+}
+
+struct u_vector {
+   uint32_t head;
+   uint32_t tail;
+   uint32_t element_size;
+   uint32_t size;
+   void *data;
+};
+
+int u_vector_init(struct u_vector *queue, uint32_t element_size, uint32_t size);
+void *u_vector_add(struct u_vector *queue);
+void *u_vector_remove(struct u_vector *queue);
+
+static inline int
+u_vector_length(struct u_vector *queue)
+{
+   return (queue->head - queue->tail) / queue->element_size;
+}
+
+static inline void *
+u_vector_head(struct u_vector *vector)
+{
+   assert(vector->tail < vector->head);
+   return (void *)((char *)vector->data +
+                   ((vector->head - vector->element_size) &
+                    (vector->size - 1)));
+}
+
+static inline void *
+u_vector_tail(struct u_vector *vector)
+{
+   return (void *)((char *)vector->data + (vector->tail & (vector->size - 1)));
+}
+
+static inline void
+u_vector_finish(struct u_vector *queue)
+{
+   free(queue->data);
+}
+
+#define u_vector_foreach(elem, queue)                                  \
+   static_assert(__builtin_types_compatible_p(__typeof__(queue), struct u_vector *), ""); \
+   for (uint32_t __u_vector_offset = (queue)->tail;                                \
+        elem = (queue)->data + (__u_vector_offset & ((queue)->size - 1)), __u_vector_offset < (queue)->head; \
+        __u_vector_offset += (queue)->element_size)
+
+
+#endif
+