1 files changed, 74 insertions, 0 deletions
diff --git a/common/kernel/relptr.h b/common/kernel/relptr.h
new file mode 100644
index 00000000..f0f45b7d
--- /dev/null
+++ b/common/kernel/relptr.h
@@ -0,0 +1,74 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Claire Xenia Wolf <claire@yosyshq.com>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef RELPTR_H
+#define RELPTR_H
+
+#include <cstdint>
+
+#include "nextpnr_assertions.h"
+#include "nextpnr_namespaces.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+template <typename T> struct RelPtr
+{
+    int32_t offset;
+
+    const T *get() const { return reinterpret_cast<const T *>(reinterpret_cast<const char *>(this) + offset); }
+
+    const T &operator[](std::size_t index) const { return get()[index]; }
+
+    const T &operator*() const { return *(get()); }
+
+    const T *operator->() const { return get(); }
+
+    RelPtr(const RelPtr &) = delete;
+    RelPtr &operator=(const RelPtr &) = delete;
+};
+
+NPNR_PACKED_STRUCT(template <typename T> struct RelSlice {
+    int32_t offset;
+    uint32_t length;
+
+    const T *get() const { return reinterpret_cast<const T *>(reinterpret_cast<const char *>(this) + offset); }
+
+    const T &operator[](std::size_t index) const
+    {
+        NPNR_ASSERT(index < length);
+        return get()[index];
+    }
+
+    const T *begin() const { return get(); }
+    const T *end() const { return get() + length; }
+
+    size_t size() const { return length; }
+    ptrdiff_t ssize() const { return length; }
+
+    const T &operator*() const { return *(get()); }
+
+    const T *operator->() const { return get(); }
+
+    RelSlice(const RelSlice &) = delete;
+    RelSlice &operator=(const RelSlice &) = delete;
+});
+
+NEXTPNR_NAMESPACE_END
+
+#endif /* RELPTR_H */