================ @@ -0,0 +1,66 @@ +//===--------------------- BitcastBuffer.h ----------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +#ifndef LLVM_CLANG_AST_INTERP_BITCAST_BUFFER_H +#define LLVM_CLANG_AST_INTERP_BITCAST_BUFFER_H + +#include <cassert> +#include <cstddef> +#include <memory> + +namespace clang { +namespace interp { + +enum class Endian { Little, Big }; + +/// Returns the value of the bit in the given sequence of bytes. +static inline bool bitof(const std::byte *B, unsigned BitIndex) { + return (B[BitIndex / 8] & (std::byte{1} << (BitIndex % 8))) != std::byte{0}; +} + +/// Returns whether \p N is a full byte offset or size. +static inline bool fullByte(unsigned N) { return N % 8 == 0; } + +/// Track what bits have been initialized to known values and which ones +/// have indeterminate value. +/// All offsets are in bits. ---------------- AaronBallman wrote:
There's a small part of me that wonders if we should use a different type for representing bits. e.g., instead of using `size_t` to mean byte offset and bit offset depending on context, I wonder if we want a `BitOffset` datatype (strong enum? constexpr class?) to represent bit offsets and have no implicit conversions to/from `size_t` to help avoid accidentally mixing bit and byte offsets. WDYT? https://github.com/llvm/llvm-project/pull/116843 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
