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Diffstat (limited to 'common/kernel/relptr.h')
-rw-r--r-- | common/kernel/relptr.h | 74 |
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 */ |