整理初版

third_party/asmjit/core/codebuffer.h

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+// This file is part of AsmJit project <https://asmjit.com>
+//
+// See asmjit.h or LICENSE.md for license and copyright information
+// SPDX-License-Identifier: Zlib
+
+#ifndef ASMJIT_CORE_CODEBUFFER_H_INCLUDED
+#define ASMJIT_CORE_CODEBUFFER_H_INCLUDED
+
+#include "../core/globals.h"
+#include "../core/support.h"
+
+ASMJIT_BEGIN_NAMESPACE
+
+//! \addtogroup asmjit_core
+//! \{
+
+//! Flags used by \ref CodeBuffer.
+enum class CodeBufferFlags : uint32_t {
+  //! No flags.
+  kNone = 0,
+  //! Buffer is external (not allocated by asmjit).
+  kIsExternal = 0x00000001u,
+  //! Buffer is fixed (cannot be reallocated).
+  kIsFixed = 0x00000002u
+};
+ASMJIT_DEFINE_ENUM_FLAGS(CodeBufferFlags)
+
+//! Code or data buffer.
+struct CodeBuffer {
+  //! \name Members
+  //! \{
+
+  //! The content of the buffer (data).
+  uint8_t* _data;
+  //! Number of bytes of `data` used.
+  size_t _size;
+  //! Buffer capacity (in bytes).
+  size_t _capacity;
+  //! Buffer flags.
+  CodeBufferFlags _flags;
+
+  //! \}
+
+  //! \name Overloaded Operators
+  //! \{
+
+  //! Returns a reference to the byte at the given `index`.
+  inline uint8_t& operator[](size_t index) noexcept {
+    ASMJIT_ASSERT(index < _size);
+    return _data[index];
+  }
+  //! \overload
+  inline const uint8_t& operator[](size_t index) const noexcept {
+    ASMJIT_ASSERT(index < _size);
+    return _data[index];
+  }
+
+  //! \}
+
+  //! \name Accessors
+  //! \{
+
+  //! Returns code buffer flags.
+  inline CodeBufferFlags flags() const noexcept { return _flags; }
+  //! Tests whether the code buffer has the given `flag` set.
+  inline bool hasFlag(CodeBufferFlags flag) const noexcept { return Support::test(_flags, flag); }
+
+  //! Tests whether this code buffer has a fixed size.
+  //!
+  //! Fixed size means that the code buffer is fixed and cannot grow.
+  inline bool isFixed() const noexcept { return hasFlag(CodeBufferFlags::kIsFixed); }
+
+  //! Tests whether the data in this code buffer is external.
+  //!
+  //! External data can only be provided by users, it's never used by AsmJit.
+  inline bool isExternal() const noexcept { return hasFlag(CodeBufferFlags::kIsExternal); }
+
+  //! Tests whether the data in this code buffer is allocated (non-null).
+  inline bool isAllocated() const noexcept { return _data != nullptr; }
+
+  //! Tests whether the code buffer is empty.
+  inline bool empty() const noexcept { return !_size; }
+
+  //! Returns the size of the data.
+  inline size_t size() const noexcept { return _size; }
+  //! Returns the capacity of the data.
+  inline size_t capacity() const noexcept { return _capacity; }
+
+  //! Returns the pointer to the data the buffer references.
+  inline uint8_t* data() noexcept { return _data; }
+  //! \overload
+  inline const uint8_t* data() const noexcept { return _data; }
+
+  //! \}
+
+  //! \name Iterators
+  //! \{
+
+  inline uint8_t* begin() noexcept { return _data; }
+  inline const uint8_t* begin() const noexcept { return _data; }
+
+  inline uint8_t* end() noexcept { return _data + _size; }
+  inline const uint8_t* end() const noexcept { return _data + _size; }
+
+  //! \}
+};
+
+//! \}
+
+ASMJIT_END_NAMESPACE
+
+#endif // ASMJIT_CORE_CODEBUFFER_H_INCLUDED
+