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// AsmJit - Machine code generation for C++
//
// * Official AsmJit Home Page: https://asmjit.com
// * Official Github Repository: https://github.com/asmjit/asmjit
//
// Copyright (c) 2008-2020 The AsmJit Authors
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
#ifndef ASMJIT_CORE_CODEBUFFER_H_INCLUDED
#define ASMJIT_CORE_CODEBUFFER_H_INCLUDED
#include "../core/globals.h"
ASMJIT_BEGIN_NAMESPACE
//! \addtogroup asmjit_core
//! \{
// ============================================================================
// [asmjit::CodeBuffer]
// ============================================================================
//! Code or data buffer.
struct CodeBuffer {
//! 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.
uint32_t _flags;
//! Code buffer flags.
enum Flags : uint32_t {
//! Buffer is external (not allocated by asmjit).
kFlagIsExternal = 0x00000001u,
//! Buffer is fixed (cannot be reallocated).
kFlagIsFixed = 0x00000002u
};
//! \name Overloaded Operators
//! \{
//! Returns a referebce 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, see \ref Flags.
inline uint32_t flags() const noexcept { return _flags; }
//! Tests whether the code buffer has the given `flag` set.
inline bool hasFlag(uint32_t flag) const noexcept { return (_flags & flag) != 0; }
//! 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(kFlagIsFixed); }
//! 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(kFlagIsExternal); }
//! 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
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