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diff --git a/src/google/protobuf/arenastring.h b/src/google/protobuf/arenastring.h
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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_ARENASTRING_H__
+#define GOOGLE_PROTOBUF_ARENASTRING_H__
+
+#include <string>
+
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/fastmem.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/generated_message_util.h>
+
+
+
+// This is the implementation of arena string fields written for the open-source
+// release. The ArenaStringPtr struct below is an internal implementation class
+// and *should not be used* by user code. It is used to collect string
+// operations together into one place and abstract away the underlying
+// string-field pointer representation, so that (for example) an alternate
+// implementation that knew more about ::std::string's internals could integrate more
+// closely with the arena allocator.
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+struct LIBPROTOBUF_EXPORT ArenaStringPtr {
+ inline void Set(const ::std::string* default_value,
+ const ::std::string& value, ::google::protobuf::Arena* arena) {
+ if (ptr_ == default_value) {
+ CreateInstance(arena, &value);
+ } else {
+ *ptr_ = value;
+ }
+ }
+
+ // Basic accessors.
+ inline const ::std::string& Get(const ::std::string* /* default_value */) const {
+ return *ptr_;
+ }
+
+ inline ::std::string* Mutable(const ::std::string* default_value,
+ ::google::protobuf::Arena* arena) {
+ if (ptr_ == default_value) {
+ CreateInstance(arena, default_value);
+ }
+ return ptr_;
+ }
+
+ // Release returns a ::std::string* instance that is heap-allocated and is not
+ // Own()'d by any arena. If the field was not set, it returns NULL. The caller
+ // retains ownership. Clears this field back to NULL state. Used to implement
+ // release_<field>() methods on generated classes.
+ inline ::std::string* Release(const ::std::string* default_value,
+ ::google::protobuf::Arena* arena) {
+ if (ptr_ == default_value) {
+ return NULL;
+ }
+ ::std::string* released = NULL;
+ if (arena != NULL) {
+ // ptr_ is owned by the arena -- we need to return a copy.
+ released = new ::std::string(*ptr_);
+ } else {
+ released = ptr_;
+ }
+ ptr_ = const_cast< ::std::string* >(default_value);
+ return released;
+ }
+
+ // UnsafeArenaRelease returns a ::std::string*, but it may be arena-owned (i.e.
+ // have its destructor already registered) if arena != NULL. If the field was
+ // not set, this returns NULL. This method clears this field back to NULL
+ // state. Used to implement unsafe_arena_release_<field>() methods on
+ // generated classes.
+ inline ::std::string* UnsafeArenaRelease(const ::std::string* default_value,
+ ::google::protobuf::Arena* /* arena */) {
+ if (ptr_ == default_value) {
+ return NULL;
+ }
+ ::std::string* released = ptr_;
+ ptr_ = const_cast< ::std::string* >(default_value);
+ return released;
+ }
+
+ // Takes a string that is heap-allocated, and takes ownership. The string's
+ // destructor is registered with the arena. Used to implement
+ // set_allocated_<field> in generated classes.
+ inline void SetAllocated(const ::std::string* default_value,
+ ::std::string* value, ::google::protobuf::Arena* arena) {
+ if (arena == NULL && ptr_ != default_value) {
+ Destroy(default_value, arena);
+ }
+ if (value != NULL) {
+ ptr_ = value;
+ if (arena != NULL) {
+ arena->Own(value);
+ }
+ } else {
+ ptr_ = const_cast< ::std::string* >(default_value);
+ }
+ }
+
+ // Takes a string that has lifetime equal to the arena's lifetime. The arena
+ // must be non-null. It is safe only to pass this method a value returned by
+ // UnsafeArenaRelease() on another field of a message in the same arena. Used
+ // to implement unsafe_arena_set_allocated_<field> in generated classes.
+ inline void UnsafeArenaSetAllocated(const ::std::string* default_value,
+ ::std::string* value, ::google::protobuf::Arena* /* arena */) {
+ if (value != NULL) {
+ ptr_ = value;
+ } else {
+ ptr_ = const_cast< ::std::string* >(default_value);
+ }
+ }
+
+ // Swaps internal pointers. Arena-safety semantics: this is guarded by the
+ // logic in Swap()/UnsafeArenaSwap() at the message level, so this method is
+ // 'unsafe' if called directly.
+ GOOGLE_ATTRIBUTE_ALWAYS_INLINE void Swap(ArenaStringPtr* other) {
+ std::swap(ptr_, other->ptr_);
+ }
+
+ // Frees storage (if not on an arena) and sets field to default value.
+ inline void Destroy(const ::std::string* default_value,
+ ::google::protobuf::Arena* arena) {
+ if (arena == NULL && ptr_ != default_value) {
+ delete ptr_;
+ }
+ ptr_ = const_cast< ::std::string* >(default_value);
+ }
+
+ // Clears content, but keeps allocated string if arena != NULL, to avoid the
+ // overhead of heap operations. After this returns, the content (as seen by
+ // the user) will always be the empty string. Assumes that |default_value|
+ // is an empty string.
+ inline void ClearToEmpty(const ::std::string* default_value,
+ ::google::protobuf::Arena* /* arena */) {
+ if (ptr_ == default_value) {
+ // Already set to default (which is empty) -- do nothing.
+ } else {
+ ptr_->clear();
+ }
+ }
+
+ // Clears content, but keeps allocated string if arena != NULL, to avoid the
+ // overhead of heap operations. After this returns, the content (as seen by
+ // the user) will always be equal to |default_value|.
+ inline void ClearToDefault(const ::std::string* default_value,
+ ::google::protobuf::Arena* /* arena */) {
+ if (ptr_ == default_value) {
+ // Already set to default -- do nothing.
+ } else {
+ // Have another allocated string -- rather than throwing this away and
+ // resetting ptr_ to the canonical default string instance, we just reuse
+ // this instance.
+ *ptr_ = *default_value;
+ }
+ }
+
+ // Called from generated code / reflection runtime only. Resets value to point
+ // to a default string pointer, with the semantics that this ArenaStringPtr
+ // does not own the pointed-to memory. Disregards initial value of ptr_ (so
+ // this is the *ONLY* safe method to call after construction or when
+ // reinitializing after becoming the active field in a oneof union).
+ inline void UnsafeSetDefault(const ::std::string* default_value) {
+ // Casting away 'const' is safe here: accessors ensure that ptr_ is only
+ // returned as a const if it is equal to default_value.
+ ptr_ = const_cast< ::std::string* >(default_value);
+ }
+
+ // The 'NoArena' variants of methods below assume arena == NULL and are
+ // optimized to provide very little overhead relative to a raw string pointer
+ // (while still being in-memory compatible with other code that assumes
+ // ArenaStringPtr). Note the invariant that a class instance that has only
+ // ever been mutated by NoArena methods must *only* be in the String state
+ // (i.e., tag bits are not used), *NEVER* ArenaString. This allows all
+ // tagged-pointer manipulations to be avoided.
+ inline void SetNoArena(const ::std::string* default_value,
+ const ::std::string& value) {
+ if (ptr_ == default_value) {
+ CreateInstanceNoArena(&value);
+ } else {
+ *ptr_ = value;
+ }
+ }
+
+ void AssignWithDefault(const ::std::string* default_value, ArenaStringPtr value);
+
+ inline const ::std::string& GetNoArena(const ::std::string* /* default_value */) const {
+ return *ptr_;
+ }
+
+ inline ::std::string* MutableNoArena(const ::std::string* default_value) {
+ if (ptr_ == default_value) {
+ CreateInstanceNoArena(default_value);
+ }
+ return ptr_;
+ }
+
+ inline ::std::string* ReleaseNoArena(const ::std::string* default_value) {
+ if (ptr_ == default_value) {
+ return NULL;
+ } else {
+ ::std::string* released = ptr_;
+ ptr_ = const_cast< ::std::string* >(default_value);
+ return released;
+ }
+ }
+
+ inline void SetAllocatedNoArena(const ::std::string* default_value,
+ ::std::string* value) {
+ if (ptr_ != default_value) {
+ delete ptr_;
+ }
+ if (value != NULL) {
+ ptr_ = value;
+ } else {
+ ptr_ = const_cast< ::std::string* >(default_value);
+ }
+ }
+
+ inline void DestroyNoArena(const ::std::string* default_value) {
+ if (ptr_ != default_value) {
+ delete ptr_;
+ }
+ ptr_ = NULL;
+ }
+
+ inline void ClearToEmptyNoArena(const ::std::string* default_value) {
+ if (ptr_ == default_value) {
+ // Nothing: already equal to default (which is the empty string).
+ } else {
+ ptr_->clear();
+ }
+ }
+
+ inline void ClearToDefaultNoArena(const ::std::string* default_value) {
+ if (ptr_ == default_value) {
+ // Nothing: already set to default.
+ } else {
+ // Reuse existing allocated instance.
+ *ptr_ = *default_value;
+ }
+ }
+
+ // Internal accessor used only at parse time to provide direct access to the
+ // raw pointer from the shared parse routine (in the non-arenas case). The
+ // parse routine does the string allocation in order to save code size in the
+ // generated parsing code.
+ inline ::std::string** UnsafeRawStringPointer() {
+ return &ptr_;
+ }
+
+ private:
+ ::std::string* ptr_;
+
+ GOOGLE_ATTRIBUTE_NOINLINE void CreateInstance(::google::protobuf::Arena* arena,
+ const ::std::string* initial_value) {
+ // Assumes ptr_ is not NULL.
+ if (initial_value != NULL) {
+ ptr_ = new ::std::string(*initial_value);
+ } else {
+ ptr_ = new ::std::string();
+ }
+ if (arena != NULL) {
+ arena->Own(ptr_);
+ }
+ }
+ GOOGLE_ATTRIBUTE_NOINLINE void CreateInstanceNoArena(const ::std::string* initial_value) {
+ if (initial_value != NULL) {
+ ptr_ = new ::std::string(*initial_value);
+ } else {
+ ptr_ = new ::std::string();
+ }
+ }
+};
+
+} // namespace internal
+} // namespace protobuf
+
+
+
+} // namespace google
+#endif // GOOGLE_PROTOBUF_ARENASTRING_H__