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+// 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.
+
+#ifndef GOOGLE_PROTOBUF_METADATA_LITE_H__
+#define GOOGLE_PROTOBUF_METADATA_LITE_H__
+
+#include <string>
+#include <stubs/common.h>
+#include <arena.h>
+#include <port.h>
+
+#include <port_def.inc>
+
+#ifdef SWIG
+#error "You cannot SWIG proto headers"
+#endif
+
+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 owning Arena pointer, if there are
+// no unknown fields, or a pointer to a block of memory with both the owning
+// Arena pointer and the UnknownFieldSet, if there are unknown fields. Besides,
+// it also uses the tag to distinguish whether the owning Arena pointer is also
+// used by sub-structure allocation. This optimization allows for
+// "zero-overhead" storage of the Arena pointer, relative to the above baseline
+// implementation.
+//
+// The tagged pointer uses the least two significant bits to disambiguate cases.
+// It uses bit 0 == 0 to indicate an arena pointer and bit 0 == 1 to indicate a
+// UFS+Arena-container pointer. Besides it uses bit 1 == 0 to indicate arena
+// allocation and bit 1 == 1 to indicate heap allocation.
+class InternalMetadata {
+ public:
+ constexpr InternalMetadata() : ptr_(0) {}
+ explicit InternalMetadata(Arena* arena, bool is_message_owned = false)
+ : ptr_(is_message_owned
+ ? reinterpret_cast<intptr_t>(arena) | kMessageOwnedArenaTagMask
+ : reinterpret_cast<intptr_t>(arena)) {
+ GOOGLE_DCHECK(!is_message_owned || arena != nullptr);
+ }
+
+ ~InternalMetadata() {
+ if (HasMessageOwnedArenaTag()) {
+ delete arena();
+ }
+ }
+
+ template <typename T>
+ void Delete() {
+ // Note that Delete<> should be called not more than once.
+ if (have_unknown_fields()) {
+ DeleteOutOfLineHelper<T>();
+ }
+ }
+
+ PROTOBUF_NDEBUG_INLINE Arena* owning_arena() const {
+ return HasMessageOwnedArenaTag() ? nullptr : arena();
+ }
+
+ PROTOBUF_NDEBUG_INLINE Arena* arena() const {
+ if (PROTOBUF_PREDICT_FALSE(have_unknown_fields())) {
+ return PtrValue<ContainerBase>()->arena;
+ } else {
+ return PtrValue<Arena>();
+ }
+ }
+
+ PROTOBUF_NDEBUG_INLINE bool have_unknown_fields() const {
+ return HasUnknownFieldsTag();
+ }
+
+ PROTOBUF_NDEBUG_INLINE void* raw_arena_ptr() const {
+ return reinterpret_cast<void*>(ptr_);
+ }
+
+ template <typename T>
+ PROTOBUF_NDEBUG_INLINE const T& unknown_fields(
+ const T& (*default_instance)()) const {
+ if (PROTOBUF_PREDICT_FALSE(have_unknown_fields())) {
+ return PtrValue<Container<T>>()->unknown_fields;
+ } else {
+ return default_instance();
+ }
+ }
+
+ template <typename T>
+ PROTOBUF_NDEBUG_INLINE T* mutable_unknown_fields() {
+ if (PROTOBUF_PREDICT_TRUE(have_unknown_fields())) {
+ return &PtrValue<Container<T>>()->unknown_fields;
+ } else {
+ return mutable_unknown_fields_slow<T>();
+ }
+ }
+
+ template <typename T>
+ PROTOBUF_NDEBUG_INLINE void Swap(InternalMetadata* 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()) {
+ DoSwap<T>(other->mutable_unknown_fields<T>());
+ }
+ }
+
+ PROTOBUF_NDEBUG_INLINE void InternalSwap(InternalMetadata* other) {
+ std::swap(ptr_, other->ptr_);
+ }
+
+ template <typename T>
+ PROTOBUF_NDEBUG_INLINE void MergeFrom(const InternalMetadata& other) {
+ if (other.have_unknown_fields()) {
+ DoMergeFrom<T>(other.unknown_fields<T>(nullptr));
+ }
+ }
+
+ template <typename T>
+ PROTOBUF_NDEBUG_INLINE void Clear() {
+ if (have_unknown_fields()) {
+ DoClear<T>();
+ }
+ }
+
+ private:
+ intptr_t ptr_;
+
+ // Tagged pointer implementation.
+ static constexpr intptr_t kUnknownFieldsTagMask = 1;
+ static constexpr intptr_t kMessageOwnedArenaTagMask = 2;
+ static constexpr intptr_t kPtrTagMask =
+ kUnknownFieldsTagMask | kMessageOwnedArenaTagMask;
+ static constexpr intptr_t kPtrValueMask = ~kPtrTagMask;
+
+ // Accessors for pointer tag and pointer value.
+ PROTOBUF_ALWAYS_INLINE bool HasUnknownFieldsTag() const {
+ return ptr_ & kUnknownFieldsTagMask;
+ }
+ PROTOBUF_ALWAYS_INLINE bool HasMessageOwnedArenaTag() const {
+ return ptr_ & kMessageOwnedArenaTagMask;
+ }
+
+ template <typename U>
+ U* PtrValue() const {
+ return reinterpret_cast<U*>(ptr_ & kPtrValueMask);
+ }
+
+ // If ptr_'s tag is kTagContainer, it points to an instance of this struct.
+ struct ContainerBase {
+ Arena* arena;
+ };
+
+ template <typename T>
+ struct Container : public ContainerBase {
+ T unknown_fields;
+ };
+
+ template <typename T>
+ PROTOBUF_NOINLINE void DeleteOutOfLineHelper() {
+ if (arena() == nullptr) {
+ delete PtrValue<Container<T>>();
+ }
+ }
+
+ template <typename T>
+ PROTOBUF_NOINLINE T* mutable_unknown_fields_slow() {
+ Arena* my_arena = arena();
+ Container<T>* container = Arena::Create<Container<T>>(my_arena);
+ intptr_t message_owned_arena_tag = ptr_ & kMessageOwnedArenaTagMask;
+ // Two-step assignment works around a bug in clang's static analyzer:
+ // https://bugs.llvm.org/show_bug.cgi?id=34198.
+ ptr_ = reinterpret_cast<intptr_t>(container);
+ ptr_ |= kUnknownFieldsTagMask | message_owned_arena_tag;
+ container->arena = my_arena;
+ return &(container->unknown_fields);
+ }
+
+ // Templated functions.
+
+ template <typename T>
+ PROTOBUF_NOINLINE void DoClear() {
+ mutable_unknown_fields<T>()->Clear();
+ }
+
+ template <typename T>
+ PROTOBUF_NOINLINE void DoMergeFrom(const T& other) {
+ mutable_unknown_fields<T>()->MergeFrom(other);
+ }
+
+ template <typename T>
+ PROTOBUF_NOINLINE void DoSwap(T* other) {
+ mutable_unknown_fields<T>()->Swap(other);
+ }
+};
+
+// String Template specializations.
+
+template <>
+PROTOBUF_EXPORT void InternalMetadata::DoClear<std::string>();
+template <>
+PROTOBUF_EXPORT void InternalMetadata::DoMergeFrom<std::string>(
+ const std::string& other);
+template <>
+PROTOBUF_EXPORT void InternalMetadata::DoSwap<std::string>(std::string* other);
+
+// This helper RAII class is needed to efficiently parse unknown fields. We
+// should only call mutable_unknown_fields if there are actual unknown fields.
+// The obvious thing to just use a stack string and swap it at the end of
+// the parse won't work, because the destructor of StringOutputStream needs to
+// be called before we can modify the string (it check-fails). Using
+// LiteUnknownFieldSetter setter(&_internal_metadata_);
+// StringOutputStream stream(setter.buffer());
+// guarantees that the string is only swapped after stream is destroyed.
+class PROTOBUF_EXPORT LiteUnknownFieldSetter {
+ public:
+ explicit LiteUnknownFieldSetter(InternalMetadata* metadata)
+ : metadata_(metadata) {
+ if (metadata->have_unknown_fields()) {
+ buffer_.swap(*metadata->mutable_unknown_fields<std::string>());
+ }
+ }
+ ~LiteUnknownFieldSetter() {
+ if (!buffer_.empty())
+ metadata_->mutable_unknown_fields<std::string>()->swap(buffer_);
+ }
+ std::string* buffer() { return &buffer_; }
+
+ private:
+ InternalMetadata* metadata_;
+ std::string buffer_;
+};
+
+} // namespace internal
+} // namespace protobuf
+} // namespace google
+
+#include <port_undef.inc>
+
+#endif // GOOGLE_PROTOBUF_METADATA_LITE_H__