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Diffstat (limited to 'client/asmjit/core/zonestring.h')
| -rw-r--r-- | client/asmjit/core/zonestring.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/client/asmjit/core/zonestring.h b/client/asmjit/core/zonestring.h new file mode 100644 index 0000000..cb25b29 --- /dev/null +++ b/client/asmjit/core/zonestring.h @@ -0,0 +1,137 @@ +// 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_SMALLSTRING_H_INCLUDED +#define ASMJIT_CORE_SMALLSTRING_H_INCLUDED + +#include "../core/globals.h" +#include "../core/zone.h" + +ASMJIT_BEGIN_NAMESPACE + +//! \addtogroup asmjit_zone +//! \{ + +// ============================================================================ +// [asmjit::ZoneStringBase] +// ============================================================================ + +//! A helper class used by \ref ZoneString implementation. +struct ZoneStringBase { + union { + struct { + uint32_t _size; + char _embedded[sizeof(void*) * 2 - 4]; + }; + struct { + void* _dummy; + char* _external; + }; + }; + + inline void reset() noexcept { + _dummy = nullptr; + _external = nullptr; + } + + Error setData(Zone* zone, uint32_t maxEmbeddedSize, const char* str, size_t size) noexcept { + if (size == SIZE_MAX) + size = strlen(str); + + if (size <= maxEmbeddedSize) { + memcpy(_embedded, str, size); + _embedded[size] = '\0'; + } + else { + char* external = static_cast<char*>(zone->dup(str, size, true)); + if (ASMJIT_UNLIKELY(!external)) + return DebugUtils::errored(kErrorOutOfMemory); + _external = external; + } + + _size = uint32_t(size); + return kErrorOk; + } +}; + +// ============================================================================ +// [asmjit::ZoneString<N>] +// ============================================================================ + +//! A string template that can be zone allocated. +//! +//! Helps with creating strings that can be either statically allocated if they +//! are small, or externally allocated in case their size exceeds the limit. +//! The `N` represents the size of the whole `ZoneString` structure, based on +//! that size the maximum size of the internal buffer is determined. +template<size_t N> +class ZoneString { +public: + static constexpr uint32_t kWholeSize = + (N > sizeof(ZoneStringBase)) ? uint32_t(N) : uint32_t(sizeof(ZoneStringBase)); + static constexpr uint32_t kMaxEmbeddedSize = kWholeSize - 5; + + union { + ZoneStringBase _base; + char _wholeData[kWholeSize]; + }; + + //! \name Construction & Destruction + //! \{ + + inline ZoneString() noexcept { reset(); } + inline void reset() noexcept { _base.reset(); } + + //! \} + + //! \name Accessors + //! \{ + + //! Tests whether the string is empty. + inline bool empty() const noexcept { return _base._size == 0; } + + //! Returns the string data. + inline const char* data() const noexcept { return _base._size <= kMaxEmbeddedSize ? _base._embedded : _base._external; } + //! Returns the string size. + inline uint32_t size() const noexcept { return _base._size; } + + //! Tests whether the string is embedded (e.g. no dynamically allocated). + inline bool isEmbedded() const noexcept { return _base._size <= kMaxEmbeddedSize; } + + //! Copies a new `data` of the given `size` to the string. + //! + //! If the `size` exceeds the internal buffer the given `zone` will be + //! used to duplicate the data, otherwise the internal buffer will be + //! used as a storage. + inline Error setData(Zone* zone, const char* data, size_t size) noexcept { + return _base.setData(zone, kMaxEmbeddedSize, data, size); + } + + //! \} +}; + +//! \} + +ASMJIT_END_NAMESPACE + +#endif // ASMJIT_CORE_SMALLSTRING_H_INCLUDED |