849 lines
30 KiB
C++
849 lines
30 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: kenton@google.com (Kenton Varda)
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// Based on original Protocol Buffers design by
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// Sanjay Ghemawat, Jeff Dean, and others.
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//
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// DynamicMessage is implemented by constructing a data structure which
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// has roughly the same memory layout as a generated message would have.
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// Then, we use GeneratedMessageReflection to implement our reflection
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// interface. All the other operations we need to implement (e.g.
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// parsing, copying, etc.) are already implemented in terms of
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// Reflection, so the rest is easy.
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//
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// The up side of this strategy is that it's very efficient. We don't
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// need to use hash_maps or generic representations of fields. The
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// down side is that this is a low-level memory management hack which
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// can be tricky to get right.
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//
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// As mentioned in the header, we only expose a DynamicMessageFactory
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// publicly, not the DynamicMessage class itself. This is because
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// GenericMessageReflection wants to have a pointer to a "default"
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// copy of the class, with all fields initialized to their default
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// values. We only want to construct one of these per message type,
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// so DynamicMessageFactory stores a cache of default messages for
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// each type it sees (each unique Descriptor pointer). The code
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// refers to the "default" copy of the class as the "prototype".
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//
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// Note on memory allocation: This module often calls "operator new()"
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// to allocate untyped memory, rather than calling something like
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// "new uint8[]". This is because "operator new()" means "Give me some
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// space which I can use as I please." while "new uint8[]" means "Give
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// me an array of 8-bit integers.". In practice, the later may return
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// a pointer that is not aligned correctly for general use. I believe
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// Item 8 of "More Effective C++" discusses this in more detail, though
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// I don't have the book on me right now so I'm not sure.
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#include <algorithm>
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#include <google/protobuf/stubs/hash.h>
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#include <memory>
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#ifndef _SHARED_PTR_H
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#include <google/protobuf/stubs/shared_ptr.h>
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#endif
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#include <google/protobuf/stubs/common.h>
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#include <google/protobuf/dynamic_message.h>
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#include <google/protobuf/descriptor.h>
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#include <google/protobuf/descriptor.pb.h>
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#include <google/protobuf/generated_message_util.h>
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#include <google/protobuf/generated_message_reflection.h>
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#include <google/protobuf/arenastring.h>
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#include <google/protobuf/extension_set.h>
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#include <google/protobuf/map_field.h>
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#include <google/protobuf/map_field_inl.h>
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#include <google/protobuf/map_type_handler.h>
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#include <google/protobuf/reflection_ops.h>
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#include <google/protobuf/repeated_field.h>
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#include <google/protobuf/wire_format.h>
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namespace google {
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namespace protobuf {
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using internal::DynamicMapField;
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using internal::ExtensionSet;
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using internal::GeneratedMessageReflection;
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using internal::InternalMetadataWithArena;
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using internal::MapField;
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using internal::ArenaStringPtr;
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// ===================================================================
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// Some helper tables and functions...
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namespace {
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bool IsMapFieldInApi(const FieldDescriptor* field) {
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return field->is_map();
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}
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// Compute the byte size of the in-memory representation of the field.
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int FieldSpaceUsed(const FieldDescriptor* field) {
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typedef FieldDescriptor FD; // avoid line wrapping
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if (field->label() == FD::LABEL_REPEATED) {
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switch (field->cpp_type()) {
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case FD::CPPTYPE_INT32 : return sizeof(RepeatedField<int32 >);
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case FD::CPPTYPE_INT64 : return sizeof(RepeatedField<int64 >);
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case FD::CPPTYPE_UINT32 : return sizeof(RepeatedField<uint32 >);
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case FD::CPPTYPE_UINT64 : return sizeof(RepeatedField<uint64 >);
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case FD::CPPTYPE_DOUBLE : return sizeof(RepeatedField<double >);
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case FD::CPPTYPE_FLOAT : return sizeof(RepeatedField<float >);
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case FD::CPPTYPE_BOOL : return sizeof(RepeatedField<bool >);
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case FD::CPPTYPE_ENUM : return sizeof(RepeatedField<int >);
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case FD::CPPTYPE_MESSAGE:
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if (IsMapFieldInApi(field)) {
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return sizeof(DynamicMapField);
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} else {
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return sizeof(RepeatedPtrField<Message>);
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}
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case FD::CPPTYPE_STRING:
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switch (field->options().ctype()) {
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default: // TODO(kenton): Support other string reps.
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case FieldOptions::STRING:
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return sizeof(RepeatedPtrField<string>);
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}
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break;
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}
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} else {
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switch (field->cpp_type()) {
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case FD::CPPTYPE_INT32 : return sizeof(int32 );
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case FD::CPPTYPE_INT64 : return sizeof(int64 );
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case FD::CPPTYPE_UINT32 : return sizeof(uint32 );
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case FD::CPPTYPE_UINT64 : return sizeof(uint64 );
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case FD::CPPTYPE_DOUBLE : return sizeof(double );
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case FD::CPPTYPE_FLOAT : return sizeof(float );
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case FD::CPPTYPE_BOOL : return sizeof(bool );
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case FD::CPPTYPE_ENUM : return sizeof(int );
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case FD::CPPTYPE_MESSAGE:
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return sizeof(Message*);
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case FD::CPPTYPE_STRING:
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switch (field->options().ctype()) {
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default: // TODO(kenton): Support other string reps.
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case FieldOptions::STRING:
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return sizeof(ArenaStringPtr);
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}
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break;
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}
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}
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GOOGLE_LOG(DFATAL) << "Can't get here.";
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return 0;
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}
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// Compute the byte size of in-memory representation of the oneof fields
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// in default oneof instance.
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int OneofFieldSpaceUsed(const FieldDescriptor* field) {
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typedef FieldDescriptor FD; // avoid line wrapping
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switch (field->cpp_type()) {
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case FD::CPPTYPE_INT32 : return sizeof(int32 );
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case FD::CPPTYPE_INT64 : return sizeof(int64 );
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case FD::CPPTYPE_UINT32 : return sizeof(uint32 );
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case FD::CPPTYPE_UINT64 : return sizeof(uint64 );
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case FD::CPPTYPE_DOUBLE : return sizeof(double );
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case FD::CPPTYPE_FLOAT : return sizeof(float );
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case FD::CPPTYPE_BOOL : return sizeof(bool );
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case FD::CPPTYPE_ENUM : return sizeof(int );
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case FD::CPPTYPE_MESSAGE:
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return sizeof(Message*);
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case FD::CPPTYPE_STRING:
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switch (field->options().ctype()) {
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default:
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case FieldOptions::STRING:
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return sizeof(ArenaStringPtr);
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}
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break;
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}
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GOOGLE_LOG(DFATAL) << "Can't get here.";
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return 0;
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}
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inline int DivideRoundingUp(int i, int j) {
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return (i + (j - 1)) / j;
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}
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static const int kSafeAlignment = sizeof(uint64);
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static const int kMaxOneofUnionSize = sizeof(uint64);
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inline int AlignTo(int offset, int alignment) {
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return DivideRoundingUp(offset, alignment) * alignment;
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}
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// Rounds the given byte offset up to the next offset aligned such that any
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// type may be stored at it.
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inline int AlignOffset(int offset) {
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return AlignTo(offset, kSafeAlignment);
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}
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#define bitsizeof(T) (sizeof(T) * 8)
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} // namespace
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// ===================================================================
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class DynamicMessage : public Message {
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public:
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struct TypeInfo {
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int size;
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int has_bits_offset;
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int oneof_case_offset;
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int internal_metadata_offset;
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int extensions_offset;
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// Not owned by the TypeInfo.
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DynamicMessageFactory* factory; // The factory that created this object.
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const DescriptorPool* pool; // The factory's DescriptorPool.
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const Descriptor* type; // Type of this DynamicMessage.
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// Warning: The order in which the following pointers are defined is
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// important (the prototype must be deleted *before* the offsets).
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google::protobuf::scoped_array<uint32> offsets;
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google::protobuf::scoped_array<uint32> has_bits_indices;
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google::protobuf::scoped_ptr<const GeneratedMessageReflection> reflection;
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// Don't use a scoped_ptr to hold the prototype: the destructor for
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// DynamicMessage needs to know whether it is the prototype, and does so by
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// looking back at this field. This would assume details about the
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// implementation of scoped_ptr.
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const DynamicMessage* prototype;
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int weak_field_map_offset; // The offset for the weak_field_map;
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TypeInfo() : prototype(NULL) {}
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~TypeInfo() {
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delete prototype;
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}
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};
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DynamicMessage(const TypeInfo* type_info);
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~DynamicMessage();
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// Called on the prototype after construction to initialize message fields.
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void CrossLinkPrototypes();
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// implements Message ----------------------------------------------
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Message* New() const;
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Message* New(::google::protobuf::Arena* arena) const;
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::google::protobuf::Arena* GetArena() const { return NULL; };
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int GetCachedSize() const;
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void SetCachedSize(int size) const;
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Metadata GetMetadata() const;
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// We actually allocate more memory than sizeof(*this) when this
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// class's memory is allocated via the global operator new. Thus, we need to
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// manually call the global operator delete. Calling the destructor is taken
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// care of for us. This makes DynamicMessage compatible with -fsized-delete.
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// It doesn't work for MSVC though.
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#ifndef _MSC_VER
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static void operator delete(void* ptr) {
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::operator delete(ptr);
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}
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#endif // !_MSC_VER
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private:
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DynamicMessage);
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DynamicMessage(const TypeInfo* type_info, ::google::protobuf::Arena* arena);
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void SharedCtor();
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inline bool is_prototype() const {
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return type_info_->prototype == this ||
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// If type_info_->prototype is NULL, then we must be constructing
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// the prototype now, which means we must be the prototype.
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type_info_->prototype == NULL;
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}
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inline void* OffsetToPointer(int offset) {
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return reinterpret_cast<uint8*>(this) + offset;
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}
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inline const void* OffsetToPointer(int offset) const {
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return reinterpret_cast<const uint8*>(this) + offset;
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}
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const TypeInfo* type_info_;
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// TODO(kenton): Make this an atomic<int> when C++ supports it.
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mutable int cached_byte_size_;
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};
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DynamicMessage::DynamicMessage(const TypeInfo* type_info)
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: type_info_(type_info),
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cached_byte_size_(0) {
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SharedCtor();
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}
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DynamicMessage::DynamicMessage(const TypeInfo* type_info,
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::google::protobuf::Arena* arena)
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: type_info_(type_info),
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cached_byte_size_(0) {
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SharedCtor();
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}
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void DynamicMessage::SharedCtor() {
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// We need to call constructors for various fields manually and set
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// default values where appropriate. We use placement new to call
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// constructors. If you haven't heard of placement new, I suggest Googling
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// it now. We use placement new even for primitive types that don't have
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// constructors for consistency. (In theory, placement new should be used
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// any time you are trying to convert untyped memory to typed memory, though
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// in practice that's not strictly necessary for types that don't have a
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// constructor.)
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const Descriptor* descriptor = type_info_->type;
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// Initialize oneof cases.
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for (int i = 0 ; i < descriptor->oneof_decl_count(); ++i) {
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new (OffsetToPointer(type_info_->oneof_case_offset + sizeof(uint32) * i))
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uint32(0);
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}
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new (OffsetToPointer(type_info_->internal_metadata_offset))
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InternalMetadataWithArena;
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if (type_info_->extensions_offset != -1) {
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new (OffsetToPointer(type_info_->extensions_offset)) ExtensionSet;
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}
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for (int i = 0; i < descriptor->field_count(); i++) {
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const FieldDescriptor* field = descriptor->field(i);
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void* field_ptr = OffsetToPointer(type_info_->offsets[i]);
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if (field->containing_oneof()) {
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continue;
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}
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switch (field->cpp_type()) {
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#define HANDLE_TYPE(CPPTYPE, TYPE) \
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case FieldDescriptor::CPPTYPE_##CPPTYPE: \
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if (!field->is_repeated()) { \
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new(field_ptr) TYPE(field->default_value_##TYPE()); \
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} else { \
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new(field_ptr) RepeatedField<TYPE>(); \
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} \
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break;
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HANDLE_TYPE(INT32 , int32 );
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HANDLE_TYPE(INT64 , int64 );
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HANDLE_TYPE(UINT32, uint32);
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HANDLE_TYPE(UINT64, uint64);
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HANDLE_TYPE(DOUBLE, double);
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HANDLE_TYPE(FLOAT , float );
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HANDLE_TYPE(BOOL , bool );
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#undef HANDLE_TYPE
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case FieldDescriptor::CPPTYPE_ENUM:
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if (!field->is_repeated()) {
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new(field_ptr) int(field->default_value_enum()->number());
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} else {
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new(field_ptr) RepeatedField<int>();
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}
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break;
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case FieldDescriptor::CPPTYPE_STRING:
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switch (field->options().ctype()) {
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default: // TODO(kenton): Support other string reps.
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case FieldOptions::STRING:
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if (!field->is_repeated()) {
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const string* default_value;
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if (is_prototype()) {
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default_value = &field->default_value_string();
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} else {
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default_value = &(reinterpret_cast<const ArenaStringPtr*>(
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type_info_->prototype->OffsetToPointer(
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type_info_->offsets[i]))
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->Get());
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}
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ArenaStringPtr* asp = new(field_ptr) ArenaStringPtr();
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asp->UnsafeSetDefault(default_value);
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} else {
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new(field_ptr) RepeatedPtrField<string>();
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}
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break;
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}
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break;
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case FieldDescriptor::CPPTYPE_MESSAGE: {
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if (!field->is_repeated()) {
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new(field_ptr) Message*(NULL);
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} else {
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if (IsMapFieldInApi(field)) {
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new (field_ptr) DynamicMapField(
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type_info_->factory->GetPrototypeNoLock(field->message_type()));
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} else {
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new (field_ptr) RepeatedPtrField<Message>();
|
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}
|
|
}
|
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break;
|
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}
|
|
}
|
|
}
|
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}
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|
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DynamicMessage::~DynamicMessage() {
|
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const Descriptor* descriptor = type_info_->type;
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|
|
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reinterpret_cast<InternalMetadataWithArena*>(
|
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OffsetToPointer(type_info_->internal_metadata_offset))
|
|
->~InternalMetadataWithArena();
|
|
|
|
if (type_info_->extensions_offset != -1) {
|
|
reinterpret_cast<ExtensionSet*>(
|
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OffsetToPointer(type_info_->extensions_offset))->~ExtensionSet();
|
|
}
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|
|
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// We need to manually run the destructors for repeated fields and strings,
|
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// just as we ran their constructors in the DynamicMessage constructor.
|
|
// We also need to manually delete oneof fields if it is set and is string
|
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// or message.
|
|
// Additionally, if any singular embedded messages have been allocated, we
|
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// need to delete them, UNLESS we are the prototype message of this type,
|
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// in which case any embedded messages are other prototypes and shouldn't
|
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// be touched.
|
|
for (int i = 0; i < descriptor->field_count(); i++) {
|
|
const FieldDescriptor* field = descriptor->field(i);
|
|
if (field->containing_oneof()) {
|
|
void* field_ptr = OffsetToPointer(
|
|
type_info_->oneof_case_offset
|
|
+ sizeof(uint32) * field->containing_oneof()->index());
|
|
if (*(reinterpret_cast<const uint32*>(field_ptr)) ==
|
|
field->number()) {
|
|
field_ptr = OffsetToPointer(type_info_->offsets[
|
|
descriptor->field_count() + field->containing_oneof()->index()]);
|
|
if (field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
|
|
switch (field->options().ctype()) {
|
|
default:
|
|
case FieldOptions::STRING: {
|
|
const ::std::string* default_value =
|
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&(reinterpret_cast<const ArenaStringPtr*>(
|
|
reinterpret_cast<const uint8*>(
|
|
type_info_->prototype) +
|
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type_info_->offsets[i])
|
|
->Get());
|
|
reinterpret_cast<ArenaStringPtr*>(field_ptr)->Destroy(
|
|
default_value, NULL);
|
|
break;
|
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}
|
|
}
|
|
} else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
|
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delete *reinterpret_cast<Message**>(field_ptr);
|
|
}
|
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}
|
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continue;
|
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}
|
|
void* field_ptr = OffsetToPointer(type_info_->offsets[i]);
|
|
|
|
if (field->is_repeated()) {
|
|
switch (field->cpp_type()) {
|
|
#define HANDLE_TYPE(UPPERCASE, LOWERCASE) \
|
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case FieldDescriptor::CPPTYPE_##UPPERCASE : \
|
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reinterpret_cast<RepeatedField<LOWERCASE>*>(field_ptr) \
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->~RepeatedField<LOWERCASE>(); \
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break
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|
|
HANDLE_TYPE( INT32, int32);
|
|
HANDLE_TYPE( INT64, int64);
|
|
HANDLE_TYPE(UINT32, uint32);
|
|
HANDLE_TYPE(UINT64, uint64);
|
|
HANDLE_TYPE(DOUBLE, double);
|
|
HANDLE_TYPE( FLOAT, float);
|
|
HANDLE_TYPE( BOOL, bool);
|
|
HANDLE_TYPE( ENUM, int);
|
|
#undef HANDLE_TYPE
|
|
|
|
case FieldDescriptor::CPPTYPE_STRING:
|
|
switch (field->options().ctype()) {
|
|
default: // TODO(kenton): Support other string reps.
|
|
case FieldOptions::STRING:
|
|
reinterpret_cast<RepeatedPtrField<string>*>(field_ptr)
|
|
->~RepeatedPtrField<string>();
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case FieldDescriptor::CPPTYPE_MESSAGE:
|
|
if (IsMapFieldInApi(field)) {
|
|
reinterpret_cast<DynamicMapField*>(field_ptr)->~DynamicMapField();
|
|
} else {
|
|
reinterpret_cast<RepeatedPtrField<Message>*>(field_ptr)
|
|
->~RepeatedPtrField<Message>();
|
|
}
|
|
break;
|
|
}
|
|
|
|
} else if (field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
|
|
switch (field->options().ctype()) {
|
|
default: // TODO(kenton): Support other string reps.
|
|
case FieldOptions::STRING: {
|
|
const ::std::string* default_value =
|
|
&(reinterpret_cast<const ArenaStringPtr*>(
|
|
type_info_->prototype->OffsetToPointer(
|
|
type_info_->offsets[i]))
|
|
->Get());
|
|
reinterpret_cast<ArenaStringPtr*>(field_ptr)->Destroy(
|
|
default_value, NULL);
|
|
break;
|
|
}
|
|
}
|
|
} else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
|
|
if (!is_prototype()) {
|
|
Message* message = *reinterpret_cast<Message**>(field_ptr);
|
|
if (message != NULL) {
|
|
delete message;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DynamicMessage::CrossLinkPrototypes() {
|
|
// This should only be called on the prototype message.
|
|
GOOGLE_CHECK(is_prototype());
|
|
|
|
DynamicMessageFactory* factory = type_info_->factory;
|
|
const Descriptor* descriptor = type_info_->type;
|
|
|
|
// Cross-link default messages.
|
|
for (int i = 0; i < descriptor->field_count(); i++) {
|
|
const FieldDescriptor* field = descriptor->field(i);
|
|
void* field_ptr = OffsetToPointer(type_info_->offsets[i]);
|
|
if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
|
|
!field->is_repeated()) {
|
|
// For fields with message types, we need to cross-link with the
|
|
// prototype for the field's type.
|
|
// For singular fields, the field is just a pointer which should
|
|
// point to the prototype.
|
|
*reinterpret_cast<const Message**>(field_ptr) =
|
|
factory->GetPrototypeNoLock(field->message_type());
|
|
}
|
|
}
|
|
}
|
|
|
|
Message* DynamicMessage::New() const {
|
|
void* new_base = operator new(type_info_->size);
|
|
memset(new_base, 0, type_info_->size);
|
|
return new(new_base) DynamicMessage(type_info_);
|
|
}
|
|
|
|
Message* DynamicMessage::New(::google::protobuf::Arena* arena) const {
|
|
if (arena != NULL) {
|
|
Message* message = New();
|
|
arena->Own(message);
|
|
return message;
|
|
} else {
|
|
return New();
|
|
}
|
|
}
|
|
|
|
int DynamicMessage::GetCachedSize() const {
|
|
return cached_byte_size_;
|
|
}
|
|
|
|
void DynamicMessage::SetCachedSize(int size) const {
|
|
// This is theoretically not thread-compatible, but in practice it works
|
|
// because if multiple threads write this simultaneously, they will be
|
|
// writing the exact same value.
|
|
GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
|
|
cached_byte_size_ = size;
|
|
GOOGLE_SAFE_CONCURRENT_WRITES_END();
|
|
}
|
|
|
|
Metadata DynamicMessage::GetMetadata() const {
|
|
Metadata metadata;
|
|
metadata.descriptor = type_info_->type;
|
|
metadata.reflection = type_info_->reflection.get();
|
|
return metadata;
|
|
}
|
|
|
|
// ===================================================================
|
|
|
|
struct DynamicMessageFactory::PrototypeMap {
|
|
typedef hash_map<const Descriptor*, const DynamicMessage::TypeInfo*> Map;
|
|
Map map_;
|
|
};
|
|
|
|
DynamicMessageFactory::DynamicMessageFactory()
|
|
: pool_(NULL), delegate_to_generated_factory_(false),
|
|
prototypes_(new PrototypeMap) {
|
|
}
|
|
|
|
DynamicMessageFactory::DynamicMessageFactory(const DescriptorPool* pool)
|
|
: pool_(pool), delegate_to_generated_factory_(false),
|
|
prototypes_(new PrototypeMap) {
|
|
}
|
|
|
|
DynamicMessageFactory::~DynamicMessageFactory() {
|
|
for (PrototypeMap::Map::iterator iter = prototypes_->map_.begin();
|
|
iter != prototypes_->map_.end(); ++iter) {
|
|
DeleteDefaultOneofInstance(iter->second->type,
|
|
iter->second->offsets.get(),
|
|
iter->second->prototype);
|
|
delete iter->second;
|
|
}
|
|
}
|
|
|
|
const Message* DynamicMessageFactory::GetPrototype(const Descriptor* type) {
|
|
MutexLock lock(&prototypes_mutex_);
|
|
return GetPrototypeNoLock(type);
|
|
}
|
|
|
|
const Message* DynamicMessageFactory::GetPrototypeNoLock(
|
|
const Descriptor* type) {
|
|
if (delegate_to_generated_factory_ &&
|
|
type->file()->pool() == DescriptorPool::generated_pool()) {
|
|
return MessageFactory::generated_factory()->GetPrototype(type);
|
|
}
|
|
|
|
const DynamicMessage::TypeInfo** target = &prototypes_->map_[type];
|
|
if (*target != NULL) {
|
|
// Already exists.
|
|
return (*target)->prototype;
|
|
}
|
|
|
|
DynamicMessage::TypeInfo* type_info = new DynamicMessage::TypeInfo;
|
|
*target = type_info;
|
|
|
|
type_info->type = type;
|
|
type_info->pool = (pool_ == NULL) ? type->file()->pool() : pool_;
|
|
type_info->factory = this;
|
|
|
|
// We need to construct all the structures passed to
|
|
// GeneratedMessageReflection's constructor. This includes:
|
|
// - A block of memory that contains space for all the message's fields.
|
|
// - An array of integers indicating the byte offset of each field within
|
|
// this block.
|
|
// - A big bitfield containing a bit for each field indicating whether
|
|
// or not that field is set.
|
|
|
|
// Compute size and offsets.
|
|
uint32* offsets =
|
|
new uint32[type->field_count() + type->oneof_decl_count()];
|
|
type_info->offsets.reset(offsets);
|
|
|
|
// Decide all field offsets by packing in order.
|
|
// We place the DynamicMessage object itself at the beginning of the allocated
|
|
// space.
|
|
int size = sizeof(DynamicMessage);
|
|
size = AlignOffset(size);
|
|
|
|
// Next the has_bits, which is an array of uint32s.
|
|
if (type->file()->syntax() == FileDescriptor::SYNTAX_PROTO3) {
|
|
type_info->has_bits_offset = -1;
|
|
} else {
|
|
type_info->has_bits_offset = size;
|
|
int has_bits_array_size =
|
|
DivideRoundingUp(type->field_count(), bitsizeof(uint32));
|
|
size += has_bits_array_size * sizeof(uint32);
|
|
size = AlignOffset(size);
|
|
|
|
uint32* has_bits_indices = new uint32[type->field_count()];
|
|
for (int i = 0; i < type->field_count(); i++) {
|
|
has_bits_indices[i] = i;
|
|
}
|
|
type_info->has_bits_indices.reset(has_bits_indices);
|
|
}
|
|
|
|
// The oneof_case, if any. It is an array of uint32s.
|
|
if (type->oneof_decl_count() > 0) {
|
|
type_info->oneof_case_offset = size;
|
|
size += type->oneof_decl_count() * sizeof(uint32);
|
|
size = AlignOffset(size);
|
|
}
|
|
|
|
// The ExtensionSet, if any.
|
|
if (type->extension_range_count() > 0) {
|
|
type_info->extensions_offset = size;
|
|
size += sizeof(ExtensionSet);
|
|
size = AlignOffset(size);
|
|
} else {
|
|
// No extensions.
|
|
type_info->extensions_offset = -1;
|
|
}
|
|
|
|
// All the fields.
|
|
//
|
|
// TODO(b/31226269): Optimize the order of fields to minimize padding.
|
|
int num_weak_fields = 0;
|
|
for (int i = 0; i < type->field_count(); i++) {
|
|
// Make sure field is aligned to avoid bus errors.
|
|
// Oneof fields do not use any space.
|
|
if (!type->field(i)->containing_oneof()) {
|
|
int field_size = FieldSpaceUsed(type->field(i));
|
|
size = AlignTo(size, std::min(kSafeAlignment, field_size));
|
|
offsets[i] = size;
|
|
size += field_size;
|
|
}
|
|
}
|
|
|
|
// The oneofs.
|
|
for (int i = 0; i < type->oneof_decl_count(); i++) {
|
|
size = AlignTo(size, kSafeAlignment);
|
|
offsets[type->field_count() + i] = size;
|
|
size += kMaxOneofUnionSize;
|
|
}
|
|
|
|
// Add the InternalMetadataWithArena to the end.
|
|
size = AlignOffset(size);
|
|
type_info->internal_metadata_offset = size;
|
|
size += sizeof(InternalMetadataWithArena);
|
|
|
|
type_info->weak_field_map_offset = -1;
|
|
|
|
// Align the final size to make sure no clever allocators think that
|
|
// alignment is not necessary.
|
|
type_info->size = size;
|
|
|
|
|
|
// Construct the reflection object.
|
|
|
|
if (type->oneof_decl_count() > 0) {
|
|
// Compute the size of default oneof instance and offsets of default
|
|
// oneof fields.
|
|
for (int i = 0; i < type->oneof_decl_count(); i++) {
|
|
for (int j = 0; j < type->oneof_decl(i)->field_count(); j++) {
|
|
const FieldDescriptor* field = type->oneof_decl(i)->field(j);
|
|
int field_size = OneofFieldSpaceUsed(field);
|
|
size = AlignTo(size, std::min(kSafeAlignment, field_size));
|
|
offsets[field->index()] = size;
|
|
size += field_size;
|
|
}
|
|
}
|
|
}
|
|
size = AlignOffset(size);
|
|
// Allocate the prototype + oneof fields.
|
|
void* base = operator new(size);
|
|
memset(base, 0, size);
|
|
|
|
// The prototype in type_info has to be set before creating the prototype
|
|
// instance on memory. e.g., message Foo { map<int32, Foo> a = 1; }. When
|
|
// creating prototype for Foo, prototype of the map entry will also be
|
|
// created, which needs the address of the prototype of Foo (the value in
|
|
// map). To break the cyclic dependency, we have to assgin the address of
|
|
// prototype into type_info first.
|
|
type_info->prototype = static_cast<DynamicMessage*>(base);
|
|
DynamicMessage* prototype = new(base) DynamicMessage(type_info);
|
|
|
|
if (type->oneof_decl_count() > 0 || num_weak_fields > 0) {
|
|
// Construct default oneof instance.
|
|
ConstructDefaultOneofInstance(type_info->type,
|
|
type_info->offsets.get(),
|
|
prototype);
|
|
}
|
|
|
|
internal::ReflectionSchema schema = {
|
|
type_info->prototype,
|
|
type_info->offsets.get(),
|
|
type_info->has_bits_indices.get(),
|
|
type_info->has_bits_offset,
|
|
type_info->internal_metadata_offset,
|
|
type_info->extensions_offset,
|
|
type_info->oneof_case_offset,
|
|
type_info->size,
|
|
type_info->weak_field_map_offset};
|
|
|
|
type_info->reflection.reset(new GeneratedMessageReflection(
|
|
type_info->type, schema, type_info->pool, this));
|
|
|
|
// Cross link prototypes.
|
|
prototype->CrossLinkPrototypes();
|
|
|
|
return prototype;
|
|
}
|
|
|
|
void DynamicMessageFactory::ConstructDefaultOneofInstance(
|
|
const Descriptor* type,
|
|
const uint32 offsets[],
|
|
void* default_oneof_or_weak_instance) {
|
|
for (int i = 0; i < type->oneof_decl_count(); i++) {
|
|
for (int j = 0; j < type->oneof_decl(i)->field_count(); j++) {
|
|
const FieldDescriptor* field = type->oneof_decl(i)->field(j);
|
|
void* field_ptr = reinterpret_cast<uint8*>(
|
|
default_oneof_or_weak_instance) + offsets[field->index()];
|
|
switch (field->cpp_type()) {
|
|
#define HANDLE_TYPE(CPPTYPE, TYPE) \
|
|
case FieldDescriptor::CPPTYPE_##CPPTYPE: \
|
|
new(field_ptr) TYPE(field->default_value_##TYPE()); \
|
|
break;
|
|
|
|
HANDLE_TYPE(INT32 , int32 );
|
|
HANDLE_TYPE(INT64 , int64 );
|
|
HANDLE_TYPE(UINT32, uint32);
|
|
HANDLE_TYPE(UINT64, uint64);
|
|
HANDLE_TYPE(DOUBLE, double);
|
|
HANDLE_TYPE(FLOAT , float );
|
|
HANDLE_TYPE(BOOL , bool );
|
|
#undef HANDLE_TYPE
|
|
|
|
case FieldDescriptor::CPPTYPE_ENUM:
|
|
new(field_ptr) int(field->default_value_enum()->number());
|
|
break;
|
|
case FieldDescriptor::CPPTYPE_STRING:
|
|
switch (field->options().ctype()) {
|
|
default:
|
|
case FieldOptions::STRING:
|
|
ArenaStringPtr* asp = new (field_ptr) ArenaStringPtr();
|
|
asp->UnsafeSetDefault(&field->default_value_string());
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case FieldDescriptor::CPPTYPE_MESSAGE: {
|
|
new(field_ptr) Message*(NULL);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DynamicMessageFactory::DeleteDefaultOneofInstance(
|
|
const Descriptor* type,
|
|
const uint32 offsets[],
|
|
const void* default_oneof_instance) {
|
|
for (int i = 0; i < type->oneof_decl_count(); i++) {
|
|
for (int j = 0; j < type->oneof_decl(i)->field_count(); j++) {
|
|
const FieldDescriptor* field = type->oneof_decl(i)->field(j);
|
|
if (field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
|
|
switch (field->options().ctype()) {
|
|
default:
|
|
case FieldOptions::STRING:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace protobuf
|
|
} // namespace google
|