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diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/compiler/java/java_field.cc b/third_party/protobuf/3.6.0/src/google/protobuf/compiler/java/java_field.cc
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+++ b/third_party/protobuf/3.6.0/src/google/protobuf/compiler/java/java_field.cc
@@ -0,0 +1,302 @@
+// 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.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <google/protobuf/compiler/java/java_field.h>
+
+#include <memory>
+
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/java/java_context.h>
+#include <google/protobuf/compiler/java/java_enum_field.h>
+#include <google/protobuf/compiler/java/java_enum_field_lite.h>
+#include <google/protobuf/compiler/java/java_helpers.h>
+#include <google/protobuf/compiler/java/java_map_field.h>
+#include <google/protobuf/compiler/java/java_map_field_lite.h>
+#include <google/protobuf/compiler/java/java_message_field.h>
+#include <google/protobuf/compiler/java/java_message_field_lite.h>
+#include <google/protobuf/compiler/java/java_primitive_field.h>
+#include <google/protobuf/compiler/java/java_primitive_field_lite.h>
+#include <google/protobuf/compiler/java/java_string_field.h>
+#include <google/protobuf/compiler/java/java_string_field_lite.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/substitute.h>
+
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace java {
+
+namespace {
+
+ImmutableFieldGenerator* MakeImmutableGenerator(
+    const FieldDescriptor* field, int messageBitIndex, int builderBitIndex,
+    Context* context) {
+  if (field->is_repeated()) {
+    switch (GetJavaType(field)) {
+      case JAVATYPE_MESSAGE:
+        if (IsMapEntry(field->message_type())) {
+          return new ImmutableMapFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        } else {
+          return new RepeatedImmutableMessageFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        }
+      case JAVATYPE_ENUM:
+        return new RepeatedImmutableEnumFieldGenerator(
+            field, messageBitIndex, builderBitIndex, context);
+      case JAVATYPE_STRING:
+        return new RepeatedImmutableStringFieldGenerator(
+            field, messageBitIndex, builderBitIndex, context);
+      default:
+        return new RepeatedImmutablePrimitiveFieldGenerator(
+            field, messageBitIndex, builderBitIndex, context);
+    }
+  } else {
+    if (field->containing_oneof()) {
+      switch (GetJavaType(field)) {
+        case JAVATYPE_MESSAGE:
+          return new ImmutableMessageOneofFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_ENUM:
+          return new ImmutableEnumOneofFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_STRING:
+          return new ImmutableStringOneofFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        default:
+          return new ImmutablePrimitiveOneofFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+      }
+    } else {
+      switch (GetJavaType(field)) {
+        case JAVATYPE_MESSAGE:
+          return new ImmutableMessageFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_ENUM:
+          return new ImmutableEnumFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_STRING:
+          return new ImmutableStringFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        default:
+          return new ImmutablePrimitiveFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+      }
+    }
+  }
+}
+
+ImmutableFieldLiteGenerator* MakeImmutableLiteGenerator(
+    const FieldDescriptor* field, int messageBitIndex, int builderBitIndex,
+    Context* context) {
+  if (field->is_repeated()) {
+    switch (GetJavaType(field)) {
+      case JAVATYPE_MESSAGE:
+        if (IsMapEntry(field->message_type())) {
+          return new ImmutableMapFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        } else {
+          return new RepeatedImmutableMessageFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        }
+      case JAVATYPE_ENUM:
+        return new RepeatedImmutableEnumFieldLiteGenerator(
+            field, messageBitIndex, builderBitIndex, context);
+      case JAVATYPE_STRING:
+        return new RepeatedImmutableStringFieldLiteGenerator(
+            field, messageBitIndex, builderBitIndex, context);
+      default:
+        return new RepeatedImmutablePrimitiveFieldLiteGenerator(
+            field, messageBitIndex, builderBitIndex, context);
+    }
+  } else {
+    if (field->containing_oneof()) {
+      switch (GetJavaType(field)) {
+        case JAVATYPE_MESSAGE:
+          return new ImmutableMessageOneofFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_ENUM:
+          return new ImmutableEnumOneofFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_STRING:
+          return new ImmutableStringOneofFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        default:
+          return new ImmutablePrimitiveOneofFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+      }
+    } else {
+      switch (GetJavaType(field)) {
+        case JAVATYPE_MESSAGE:
+          return new ImmutableMessageFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_ENUM:
+          return new ImmutableEnumFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        case JAVATYPE_STRING:
+          return new ImmutableStringFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+        default:
+          return new ImmutablePrimitiveFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
+      }
+    }
+  }
+}
+
+
+static inline void ReportUnexpectedPackedFieldsCall(io::Printer* printer) {
+  // Reaching here indicates a bug. Cases are:
+  //   - This FieldGenerator should support packing,
+  //     but this method should be overridden.
+  //   - This FieldGenerator doesn't support packing, and this method
+  //     should never have been called.
+  GOOGLE_LOG(FATAL) << "GenerateParsingCodeFromPacked() "
+             << "called on field generator that does not support packing.";
+}
+
+}  // namespace
+
+ImmutableFieldGenerator::~ImmutableFieldGenerator() {}
+
+void ImmutableFieldGenerator::
+GenerateParsingCodeFromPacked(io::Printer* printer) const {
+  ReportUnexpectedPackedFieldsCall(printer);
+}
+
+ImmutableFieldLiteGenerator::~ImmutableFieldLiteGenerator() {}
+
+void ImmutableFieldLiteGenerator::
+GenerateParsingCodeFromPacked(io::Printer* printer) const {
+  ReportUnexpectedPackedFieldsCall(printer);
+}
+
+// ===================================================================
+
+template <>
+FieldGeneratorMap<ImmutableFieldGenerator>::FieldGeneratorMap(
+    const Descriptor* descriptor, Context* context)
+    : descriptor_(descriptor),
+      field_generators_(descriptor->field_count()) {
+
+  // Construct all the FieldGenerators and assign them bit indices for their
+  // bit fields.
+  int messageBitIndex = 0;
+  int builderBitIndex = 0;
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    ImmutableFieldGenerator* generator = MakeImmutableGenerator(
+        descriptor->field(i), messageBitIndex, builderBitIndex, context);
+    field_generators_[i].reset(generator);
+    messageBitIndex += generator->GetNumBitsForMessage();
+    builderBitIndex += generator->GetNumBitsForBuilder();
+  }
+}
+
+template<>
+FieldGeneratorMap<ImmutableFieldGenerator>::~FieldGeneratorMap() {}
+
+template <>
+FieldGeneratorMap<ImmutableFieldLiteGenerator>::FieldGeneratorMap(
+    const Descriptor* descriptor, Context* context)
+    : descriptor_(descriptor),
+      field_generators_(descriptor->field_count()) {
+  // Construct all the FieldGenerators and assign them bit indices for their
+  // bit fields.
+  int messageBitIndex = 0;
+  int builderBitIndex = 0;
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    ImmutableFieldLiteGenerator* generator = MakeImmutableLiteGenerator(
+        descriptor->field(i), messageBitIndex, builderBitIndex, context);
+    field_generators_[i].reset(generator);
+    messageBitIndex += generator->GetNumBitsForMessage();
+    builderBitIndex += generator->GetNumBitsForBuilder();
+  }
+}
+
+template<>
+FieldGeneratorMap<ImmutableFieldLiteGenerator>::~FieldGeneratorMap() {}
+
+
+void SetCommonFieldVariables(const FieldDescriptor* descriptor,
+                             const FieldGeneratorInfo* info,
+                             std::map<string, string>* variables) {
+  (*variables)["field_name"] = descriptor->name();
+  (*variables)["name"] = info->name;
+  (*variables)["classname"] = descriptor->containing_type()->name();
+  (*variables)["capitalized_name"] = info->capitalized_name;
+  (*variables)["disambiguated_reason"] = info->disambiguated_reason;
+  (*variables)["constant_name"] = FieldConstantName(descriptor);
+  (*variables)["number"] = SimpleItoa(descriptor->number());
+  // These variables are placeholders to pick out the beginning and ends of
+  // identifiers for annotations (when doing so with existing variables would
+  // be ambiguous or impossible). They should never be set to anything but the
+  // empty string.
+  (*variables)["{"] = "";
+  (*variables)["}"] = "";
+}
+
+void SetCommonOneofVariables(const FieldDescriptor* descriptor,
+                             const OneofGeneratorInfo* info,
+                             std::map<string, string>* variables) {
+  (*variables)["oneof_name"] = info->name;
+  (*variables)["oneof_capitalized_name"] = info->capitalized_name;
+  (*variables)["oneof_index"] =
+      SimpleItoa(descriptor->containing_oneof()->index());
+  (*variables)["set_oneof_case_message"] = info->name +
+      "Case_ = " + SimpleItoa(descriptor->number());
+  (*variables)["clear_oneof_case_message"] = info->name +
+      "Case_ = 0";
+  (*variables)["has_oneof_case_message"] = info->name +
+      "Case_ == " + SimpleItoa(descriptor->number());
+}
+
+void PrintExtraFieldInfo(const std::map<string, string>& variables,
+                         io::Printer* printer) {
+  const std::map<string, string>::const_iterator it =
+      variables.find("disambiguated_reason");
+  if (it != variables.end() && !it->second.empty()) {
+    printer->Print(
+        variables,
+        "// An alternative name is used for field \"$field_name$\" because:\n"
+        "//     $disambiguated_reason$\n");
+  }
+}
+
+}  // namespace java
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google