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Diffstat (limited to 'src/google/protobuf/metadata.h')
-rw-r--r-- | src/google/protobuf/metadata.h | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/src/google/protobuf/metadata.h b/src/google/protobuf/metadata.h deleted file mode 100644 index fdee150b..00000000 --- a/src/google/protobuf/metadata.h +++ /dev/null @@ -1,163 +0,0 @@ -// Protocol Buffers - Google's data interchange format -// Copyright 2008 Google Inc. All rights reserved. -// https://developers.google.com/protocol-buffers/ -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// This header file defines an internal class that encapsulates internal message -// metadata (Unknown-field set, Arena pointer, ...) and allows its -// representation to be made more space-efficient via various optimizations. -// -// Note that this is distinct from google::protobuf::Metadata, which encapsulates -// Descriptor and Reflection pointers. - -#ifndef GOOGLE_PROTOBUF_METADATA_H__ -#define GOOGLE_PROTOBUF_METADATA_H__ - -#include <google/protobuf/stubs/common.h> -#include <google/protobuf/arena.h> -#include <google/protobuf/unknown_field_set.h> - -namespace google { -namespace protobuf { -namespace internal { - -// This is the representation for messages that support arena allocation. It -// uses a tagged pointer to either store the Arena pointer, if there are no -// unknown fields, or a pointer to a block of memory with both the Arena pointer -// and the UnknownFieldSet, if there are unknown fields. This optimization -// allows for "zero-overhead" storage of the Arena pointer, relative to the -// above baseline implementation. -// -// The tagged pointer uses the LSB to disambiguate cases, and uses bit 0 == 0 to -// indicate an arena pointer and bit 0 == 1 to indicate a UFS+Arena-container -// pointer. -class LIBPROTOBUF_EXPORT InternalMetadataWithArena { - public: - InternalMetadataWithArena() : ptr_(NULL) {} - explicit InternalMetadataWithArena(Arena* arena) - : ptr_ (arena) {} - - ~InternalMetadataWithArena() { - if (have_unknown_fields() && arena() == NULL) { - delete PtrValue<Container>(); - } - ptr_ = NULL; - } - - GOOGLE_ATTRIBUTE_ALWAYS_INLINE const UnknownFieldSet& unknown_fields() const { - if (GOOGLE_PREDICT_FALSE(have_unknown_fields())) { - return PtrValue<Container>()->unknown_fields_; - } else { - return *UnknownFieldSet::default_instance(); - } - } - - GOOGLE_ATTRIBUTE_ALWAYS_INLINE UnknownFieldSet* mutable_unknown_fields() { - if (GOOGLE_PREDICT_TRUE(have_unknown_fields())) { - return &PtrValue<Container>()->unknown_fields_; - } else { - return mutable_unknown_fields_slow(); - } - } - - GOOGLE_ATTRIBUTE_ALWAYS_INLINE Arena* arena() const { - if (GOOGLE_PREDICT_FALSE(have_unknown_fields())) { - return PtrValue<Container>()->arena_; - } else { - return PtrValue<Arena>(); - } - } - - GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool have_unknown_fields() const { - return PtrTag() == kTagContainer; - } - - GOOGLE_ATTRIBUTE_ALWAYS_INLINE void Swap(InternalMetadataWithArena* other) { - // Semantics here are that we swap only the unknown fields, not the arena - // pointer. We cannot simply swap ptr_ with other->ptr_ because we need to - // maintain our own arena ptr. Also, our ptr_ and other's ptr_ may be in - // different states (direct arena pointer vs. container with UFS) so we - // cannot simply swap ptr_ and then restore the arena pointers. We reuse - // UFS's swap implementation instead. - if (have_unknown_fields() || other->have_unknown_fields()) { - mutable_unknown_fields()->Swap(other->mutable_unknown_fields()); - } - } - - GOOGLE_ATTRIBUTE_ALWAYS_INLINE void* raw_arena_ptr() const { - return ptr_; - } - - private: - void* ptr_; - - // Tagged pointer implementation. - enum { - // ptr_ is an Arena*. - kTagArena = 0, - // ptr_ is a Container*. - kTagContainer = 1, - }; - static const intptr_t kPtrTagMask = 1; - static const intptr_t kPtrValueMask = ~kPtrTagMask; - - // Accessors for pointer tag and pointer value. - GOOGLE_ATTRIBUTE_ALWAYS_INLINE int PtrTag() const { - return reinterpret_cast<intptr_t>(ptr_) & kPtrTagMask; - } - - template<typename T> T* PtrValue() const { - return reinterpret_cast<T*>( - reinterpret_cast<intptr_t>(ptr_) & kPtrValueMask); - } - - // If ptr_'s tag is kTagContainer, it points to an instance of this struct. - struct Container { - UnknownFieldSet unknown_fields_; - Arena* arena_; - }; - - GOOGLE_ATTRIBUTE_NOINLINE UnknownFieldSet* mutable_unknown_fields_slow() { - Arena* my_arena = arena(); - Container* container = Arena::Create<Container>(my_arena); - ptr_ = reinterpret_cast<void*>( - reinterpret_cast<intptr_t>(container) | kTagContainer); - container->arena_ = my_arena; - return &(container->unknown_fields_); - } -}; - -// Temporary compatibility typedef. Remove once this is released in components -// and upb CL is submitted. -typedef InternalMetadataWithArena InternalMetadata; - -} // namespace internal -} // namespace protobuf - -} // namespace google -#endif // GOOGLE_PROTOBUF_METADATA_H__ |