Improve ObjC deprecated annotation support.

- Check the parent file options for deprecation when deciding to tag Messages
  and Enums as deprecated.
- Within the generated source push/pop the warning for implementing deprecated
  things around a deprecated class implementation.
- Annotate the methods generated for extension fields as deprecated.
- Add a testing .proto file that covers deprecated fields, messages, enums,
  enum values and compile it into the unittests to confirm things compile
  cleanly.
- Add a testing .proto file that uses the file level option to make everything
  deprecated and compile it into the unittests to confirm things compile
  cleanly.

Makefile.am

@@ -558,6 +558,8 @@ objectivec_EXTRA_DIST=                                                       \
   objectivec/Tests/text_format_map_unittest_data.txt                          \
   objectivec/Tests/text_format_unittest_data.txt                              \
   objectivec/Tests/unittest_cycle.proto                                       \
+  objectivec/Tests/unittest_deprecated.proto                                  \
+  objectivec/Tests/unittest_deprecated_file.proto                             \
   objectivec/Tests/unittest_extension_chain_a.proto                           \
   objectivec/Tests/unittest_extension_chain_b.proto                           \
   objectivec/Tests/unittest_extension_chain_c.proto                           \

objectivec/DevTools/compile_testing_protos.sh

@@ -134,6 +134,8 @@ done
 compile_protos \
   --proto_path="objectivec/Tests" \
   objectivec/Tests/unittest_cycle.proto \
+  objectivec/Tests/unittest_deprecated.proto \
+  objectivec/Tests/unittest_deprecated_file.proto \
   objectivec/Tests/unittest_extension_chain_a.proto \
   objectivec/Tests/unittest_extension_chain_b.proto \
   objectivec/Tests/unittest_extension_chain_c.proto \

objectivec/Tests/GPBARCUnittestProtos.m

@@ -42,6 +42,8 @@
 #import "google/protobuf/Unittest.pbobjc.h"
 #import "google/protobuf/UnittestCustomOptions.pbobjc.h"
 #import "google/protobuf/UnittestCycle.pbobjc.h"
+#import "google/protobuf/UnittestDeprecated.pbobjc.h"
+#import "google/protobuf/UnittestDeprecatedFile.pbobjc.h"
 #import "google/protobuf/UnittestDropUnknownFields.pbobjc.h"
 #import "google/protobuf/UnittestEmbedOptimizeFor.pbobjc.h"
 #import "google/protobuf/UnittestEmpty.pbobjc.h"

objectivec/Tests/GPBUnittestProtos.m

@@ -43,6 +43,8 @@
 #import "google/protobuf/UnittestArena.pbobjc.m"
 #import "google/protobuf/UnittestCustomOptions.pbobjc.m"
 #import "google/protobuf/UnittestCycle.pbobjc.m"
+#import "google/protobuf/UnittestDeprecated.pbobjc.m"
+#import "google/protobuf/UnittestDeprecatedFile.pbobjc.m"
 #import "google/protobuf/UnittestDropUnknownFields.pbobjc.m"
 #import "google/protobuf/UnittestEmbedOptimizeFor.pbobjc.m"
 #import "google/protobuf/UnittestEmpty.pbobjc.m"

objectivec/Tests/unittest_deprecated.proto

@@ -0,0 +1,95 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2016 Google Inc.  All rights reserved.
+//
+// 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.
+
+syntax = "proto2";
+
+package protobuf_deprecated;
+option objc_class_prefix = "Dep";
+
+//
+// This file is like unittest_deprecated_file.proto, but uses message, enum,
+// enum value, and field level deprecation.
+//
+// The source generated from this file needs to be inspect to confirm it has
+// all of the expected annotations. It also will be compiled into the unittest
+// and that compile should be clean without errors.
+//
+
+// Mix of field types marked as deprecated.
+message Msg1 {
+  extensions 100 to max;
+
+  optional string string_field = 1 [deprecated=true];
+  required int32 int_field = 2 [deprecated=true];
+  repeated fixed32 fixed_field = 3 [deprecated=true];
+  optional Msg1 msg_field = 4 [deprecated=true];
+}
+
+// Mix of extension field types marked as deprecated.
+extend Msg1 {
+  optional string string_ext_field = 101 [deprecated=true];
+  optional int32 int_ext_field = 102 [deprecated=true];
+  repeated fixed32 fixed_ext_field = 103 [deprecated=true];
+  optional Msg1 msg_ext_field = 104 [deprecated=true];
+}
+
+// Mix of extension field types (scoped to a message) marked as deprecated.
+message Msg1A {
+  extend Msg1 {
+    optional string string_ext2_field = 201 [deprecated=true];
+    optional int32 int_ext2_field = 202 [deprecated=true];
+    repeated fixed32 fixed_ext2_field = 203 [deprecated=true];
+    optional Msg1 msg_ext2_field = 204 [deprecated=true];
+  }
+}
+
+// Enum value marked as deprecated.
+enum Enum1 {
+  ENUM1_ONE   = 1;
+  ENUM1_TWO   = 2;
+  ENUM1_THREE = 3 [deprecated=true];
+}
+
+// Message marked as deprecated.
+message Msg2 {
+  option deprecated = true;
+
+  optional string string_field = 1;
+  required int32 int_field = 2;
+  repeated fixed32 fixed_field = 3;
+}
+
+// Enum marked as deprecated.
+enum Enum2 {
+  option deprecated = true;
+
+  ENUM2_ONE   = 1;
+  ENUM2_TWO   = 2;
+  ENUM2_THREE = 3;
+}

objectivec/Tests/unittest_deprecated_file.proto

@@ -0,0 +1,76 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2016 Google Inc.  All rights reserved.
+//
+// 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.
+
+syntax = "proto2";
+
+package protobuf_deprecated_file;
+option objc_class_prefix = "FileDep";
+
+//
+// This file is like unittest_deprecated.proto, but does NOT use message, enum,
+// enum value, or field level deprecation; instead it uses the file level option
+// to mark everything.
+//
+// The source generated from this file needs to be inspect to confirm it has
+// all of the expected annotations. It also will be compiled into the unittest
+// and that compile should be clean without errors.
+//
+option deprecated = true;
+
+// Message to catch the deprecation.
+message Msg1 {
+  extensions 100 to max;
+
+  optional string string_field = 1;
+}
+
+// Mix of extension field types to catch the deprecation.
+extend Msg1 {
+  optional string string_ext_field = 101;
+  optional int32 int_ext_field = 102;
+  repeated fixed32 fixed_ext_field = 103;
+  optional Msg1 msg_ext_field = 104;
+}
+
+// Mix of extension field types (scoped to a message) to catch the deprecation.
+message Msg1A {
+  extend Msg1 {
+    optional string string_ext2_field = 201;
+    optional int32 int_ext2_field = 202;
+    repeated fixed32 fixed_ext2_field = 203;
+    optional Msg1 msg_ext2_field = 204;
+  }
+}
+
+// Enum to catch the deprecation.
+enum Enum1 {
+  ENUM1_ONE   = 1;
+  ENUM1_TWO   = 2;
+  ENUM1_THREE = 3;
+}

src/google/protobuf/compiler/objectivec/objectivec_enum.cc

@@ -74,7 +74,7 @@ void EnumGenerator::GenerateHeader(io::Printer* printer) {
 
   printer->Print("$comments$typedef$deprecated_attribute$ GPB_ENUM($name$) {\n",
                  "comments", enum_comments,
-                 "deprecated_attribute", GetOptionalDeprecatedAttribute(descriptor_),
+                 "deprecated_attribute", GetOptionalDeprecatedAttribute(descriptor_, descriptor_->file()),
                  "name", name_);
   printer->Indent();
 

src/google/protobuf/compiler/objectivec/objectivec_extension.cc

@@ -67,9 +67,12 @@ void ExtensionGenerator::GenerateMembersHeader(io::Printer* printer) {
   } else {
     vars["comments"] = "";
   }
+  // Unlike normal message fields, check if the file for the extension was
+  // deprecated.
+  vars["deprecated_attribute"] = GetOptionalDeprecatedAttribute(descriptor_, descriptor_->file());
   printer->Print(vars,
                  "$comments$"
-                 "+ (GPBExtensionDescriptor *)$method_name$;\n");
+                 "+ (GPBExtensionDescriptor *)$method_name$$deprecated_attribute$;\n");
 }
 
 void ExtensionGenerator::GenerateStaticVariablesInitialization(

src/google/protobuf/compiler/objectivec/objectivec_helpers.h

@@ -150,8 +150,18 @@ enum FlagType {
 };
 
 template<class TDescriptor>
-string GetOptionalDeprecatedAttribute(const TDescriptor* descriptor, bool preSpace = true, bool postNewline = false) {
-  if (descriptor->options().deprecated()) {
+string GetOptionalDeprecatedAttribute(
+    const TDescriptor* descriptor,
+    const FileDescriptor* file = NULL,
+    bool preSpace = true, bool postNewline = false) {
+  bool isDeprecated = descriptor->options().deprecated();
+  // The file is only passed when checking Messages & Enums, so those types
+  // get tagged. At the moment, it doesn't seem to make sense to tag every
+  // field or enum value with when the file is deprecated.
+  if (!isDeprecated && file) {
+    isDeprecated = file->options().deprecated();
+  }
+  if (isDeprecated) {
     string result = "DEPRECATED_ATTRIBUTE";
     if (preSpace) {
       result.insert(0, " ");

src/google/protobuf/compiler/objectivec/objectivec_message.cc

@@ -180,7 +180,10 @@ MessageGenerator::MessageGenerator(const string& root_classname,
     : root_classname_(root_classname),
       descriptor_(descriptor),
       field_generators_(descriptor, options),
-      class_name_(ClassName(descriptor_)) {
+      class_name_(ClassName(descriptor_)),
+      deprecated_attribute_(
+          GetOptionalDeprecatedAttribute(descriptor, descriptor->file(), false, true)) {
+
   for (int i = 0; i < descriptor_->extension_count(); i++) {
     extension_generators_.push_back(
         new ExtensionGenerator(class_name_, descriptor_->extension(i)));
@@ -339,7 +342,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
   printer->Print(
       "$comments$$deprecated_attribute$@interface $classname$ : GPBMessage\n\n",
       "classname", class_name_,
-      "deprecated_attribute", GetOptionalDeprecatedAttribute(descriptor_, false, true),
+      "deprecated_attribute", deprecated_attribute_,
       "comments", message_comments);
 
   vector<char> seen_oneofs(descriptor_->oneof_decl_count(), 0);
@@ -396,6 +399,14 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
         "\n",
         "classname", class_name_);
 
+    if (!deprecated_attribute_.empty()) {
+      // No warnings when compiling the impl of this deprecated class.
+      printer->Print(
+          "#pragma clang diagnostic push\n"
+          "#pragma clang diagnostic ignored \"-Wdeprecated-implementations\"\n"
+          "\n");
+    }
+
     printer->Print("@implementation $classname$\n\n",
                    "classname", class_name_);
 
@@ -601,6 +612,12 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
         "}\n\n"
         "@end\n\n");
 
+    if (!deprecated_attribute_.empty()) {
+      printer->Print(
+          "#pragma clang diagnostic pop\n"
+          "\n");
+    }
+
     for (int i = 0; i < descriptor_->field_count(); i++) {
       field_generators_.get(descriptor_->field(i))
           .GenerateCFunctionImplementations(printer);

src/google/protobuf/compiler/objectivec/objectivec_message.h

@@ -85,6 +85,7 @@ class MessageGenerator {
   const Descriptor* descriptor_;
   FieldGeneratorMap field_generators_;
   const string class_name_;
+  const string deprecated_attribute_;
   vector<ExtensionGenerator*> extension_generators_;
   vector<EnumGenerator*> enum_generators_;
   vector<MessageGenerator*> nested_message_generators_;