Fix shadowing warnings (#8926)

src/google/protobuf/compiler/command_line_interface.cc

@@ -2423,8 +2423,8 @@ bool CommandLineInterface::WriteDescriptorSet(
     to_output.insert(parsed_files.begin(), parsed_files.end());
     for (int i = 0; i < parsed_files.size(); i++) {
       const FileDescriptor* file = parsed_files[i];
-      for (int i = 0; i < file->dependency_count(); i++) {
-        const FileDescriptor* dependency = file->dependency(i);
+      for (int j = 0; j < file->dependency_count(); j++) {
+        const FileDescriptor* dependency = file->dependency(j);
         // if the dependency isn't in parsed files, mark it as already seen
         if (to_output.find(dependency) == to_output.end()) {
           already_seen.insert(dependency);

src/google/protobuf/compiler/cpp/cpp_file.cc

@@ -154,8 +154,8 @@ void FileGenerator::GenerateMacroUndefs(io::Printer* printer) {
   for (int i = 0; i < fields.size(); i++) {
     const std::string& name = fields[i]->name();
     static const char* kMacroNames[] = {"major", "minor"};
-    for (int i = 0; i < GOOGLE_ARRAYSIZE(kMacroNames); ++i) {
-      if (name == kMacroNames[i]) {
+    for (int j = 0; j < GOOGLE_ARRAYSIZE(kMacroNames); ++j) {
+      if (name == kMacroNames[j]) {
         names_to_undef.push_back(name);
         break;
       }

src/google/protobuf/compiler/cpp/cpp_helpers.cc

@@ -1168,8 +1168,8 @@ MessageAnalysis MessageSCCAnalyzer::GetSCCAnalysis(const SCC* scc) {
     if (descriptor->extension_range_count() > 0) {
       result.contains_extension = true;
     }
-    for (int i = 0; i < descriptor->field_count(); i++) {
-      const FieldDescriptor* field = descriptor->field(i);
+    for (int j = 0; j < descriptor->field_count(); j++) {
+      const FieldDescriptor* field = descriptor->field(j);
       if (field->is_required()) {
         result.contains_required = true;
       }

src/google/protobuf/compiler/cpp/cpp_service.cc

@@ -241,12 +241,12 @@ void ServiceGenerator::GenerateCallMethod(io::Printer* printer) {
 
   for (int i = 0; i < descriptor_->method_count(); i++) {
     const MethodDescriptor* method = descriptor_->method(i);
-    Formatter format(printer, vars_);
-    InitMethodVariables(method, options_, &format);
+    Formatter format_method(printer, vars_);
+    InitMethodVariables(method, options_, &format_method);
 
     // Note:  down_cast does not work here because it only works on pointers,
     //   not references.
-    format(
+    format_method(
         "    case $1$:\n"
         "      $name$(controller,\n"
         "             ::$proto_ns$::internal::DownCast<const $input_type$*>(\n"

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

@@ -127,7 +127,6 @@ void EnumGenerator::GenerateHeader(io::Printer* printer) {
     if (alias_values_to_skip_.find(all_values_[i]) != alias_values_to_skip_.end()) {
       continue;
     }
-    SourceLocation location;
     if (all_values_[i]->GetSourceLocation(&location)) {
       std::string comments = BuildCommentsString(location, true).c_str();
       if (comments.length() > 0) {

src/google/protobuf/compiler/php/php_generator.cc

@@ -1119,9 +1119,9 @@ void GenerateAddFilesToPool(const FileDescriptor* file, const Options& options,
       file, &nodes_without_dependency, &deps, &dependency_count);
 
   while (!nodes_without_dependency.empty()) {
-    auto file = *nodes_without_dependency.begin();
-    nodes_without_dependency.erase(file);
-    for (auto dependent : deps[file]) {
+    auto file_node = *nodes_without_dependency.begin();
+    nodes_without_dependency.erase(file_node);
+    for (auto dependent : deps[file_node]) {
       if (dependency_count[dependent] == 1) {
         dependency_count.erase(dependent);
         nodes_without_dependency.insert(dependent);
@@ -1130,11 +1130,11 @@ void GenerateAddFilesToPool(const FileDescriptor* file, const Options& options,
       }
     }
 
-    bool needs_aggregate = NeedsUnwrapping(file, options);
+    bool needs_aggregate = NeedsUnwrapping(file_node, options);
 
     if (needs_aggregate) {
       auto file_proto = sorted_file_set.add_file();
-      file->CopyTo(file_proto);
+      file_node->CopyTo(file_proto);
 
       // Filter out descriptor.proto as it cannot be depended on for now.
       RepeatedPtrField<std::string>* dependency =
@@ -1156,7 +1156,7 @@ void GenerateAddFilesToPool(const FileDescriptor* file, const Options& options,
         it->clear_extension();
       }
     } else {
-      std::string dependency_filename = GeneratedMetadataFileName(file, false);
+      std::string dependency_filename = GeneratedMetadataFileName(file_node, false);
       printer->Print(
           "\\^name^::initOnce();\n",
           "name", FilenameToClassname(dependency_filename));

src/google/protobuf/compiler/python/python_generator.cc

@@ -799,11 +799,11 @@ void Generator::PrintCreateDescriptor(
   printer_->Indent();
   for (int i = 0; i < message_descriptor.oneof_decl_count(); ++i) {
     const OneofDescriptor* desc = message_descriptor.oneof_decl(i);
-    std::map<std::string, std::string> m;
+    m.clear();
     m["name"] = desc->name();
     m["full_name"] = desc->full_name();
     m["index"] = StrCat(desc->index());
-    std::string options_string =
+    options_string =
         OptionsValue(desc->options().SerializeAsString());
     if (options_string == "None") {
       m["serialized_options"] = "";

src/google/protobuf/dynamic_message.cc

@@ -747,9 +747,9 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
         // hasbits.
         type_info->has_bits_offset = size;
         uint32_t* has_bits_indices = new uint32_t[type->field_count()];
-        for (int i = 0; i < type->field_count(); i++) {
+        for (int j = 0; j < type->field_count(); j++) {
           // Initialize to -1, fields that need a hasbit will overwrite.
-          has_bits_indices[i] = static_cast<uint32_t>(-1);
+          has_bits_indices[j] = static_cast<uint32_t>(-1);
         }
         type_info->has_bits_indices.reset(has_bits_indices);
       }

src/google/protobuf/generated_message_util.cc

@@ -701,13 +701,13 @@ uint8_t* SerializeInternalToArray(const uint8_t* base,
       // Special cases
       case FieldMetadata::kSpecial: {
         io::ArrayOutputStream array_stream(array_output.ptr, INT_MAX);
-        io::CodedOutputStream output(&array_stream);
-        output.SetSerializationDeterministic(is_deterministic);
+        io::CodedOutputStream output_stream(&array_stream);
+        output_stream.SetSerializationDeterministic(is_deterministic);
         func = reinterpret_cast<SpecialSerializer>(
             const_cast<void*>(field_metadata.ptr));
         func(base, field_metadata.offset, field_metadata.tag,
-             field_metadata.has_offset, &output);
-        array_output.ptr += output.ByteCount();
+             field_metadata.has_offset, &output_stream);
+        array_output.ptr += output_stream.ByteCount();
       } break;
       default:
         // __builtin_unreachable()

src/google/protobuf/reflection_ops.cc

@@ -214,9 +214,9 @@ bool ReflectionOps::IsInitialized(const Message& message, bool check_fields,
                   reflection->GetMapData(message, field);
               if (map_field->IsMapValid()) {
                 MapIterator it(const_cast<Message*>(&message), field);
-                MapIterator end(const_cast<Message*>(&message), field);
-                for (map_field->MapBegin(&it), map_field->MapEnd(&end);
-                     it != end; ++it) {
+                MapIterator end_map(const_cast<Message*>(&message), field);
+                for (map_field->MapBegin(&it), map_field->MapEnd(&end_map);
+                     it != end_map; ++it) {
                   if (!it.GetValueRef().GetMessageValue().IsInitialized()) {
                     return false;
                   }

src/google/protobuf/stubs/strutil.cc

@@ -1272,7 +1272,7 @@ char* DoubleToBuffer(double value, char* buffer) {
   // truncated to a double.
   volatile double parsed_value = internal::NoLocaleStrtod(buffer, nullptr);
   if (parsed_value != value) {
-    int snprintf_result =
+    snprintf_result =
       snprintf(buffer, kDoubleToBufferSize, "%.*g", DBL_DIG+2, value);
 
     // Should never overflow; see above.
@@ -1384,7 +1384,7 @@ char* FloatToBuffer(float value, char* buffer) {
 
   float parsed_value;
   if (!safe_strtof(buffer, &parsed_value) || parsed_value != value) {
-    int snprintf_result =
+    snprintf_result =
       snprintf(buffer, kFloatToBufferSize, "%.*g", FLT_DIG+3, value);
 
     // Should never overflow; see above.

src/google/protobuf/util/field_mask_util.cc

@@ -385,8 +385,8 @@ void FieldMaskTree::RemovePath(const std::string& path,
       if (new_branch_node == nullptr) {
         new_branch_node = node;
       }
-      for (int i = 0; i < current_descriptor->field_count(); ++i) {
-        node->children[current_descriptor->field(i)->name()] = new Node();
+      for (int j = 0; j < current_descriptor->field_count(); ++j) {
+        node->children[current_descriptor->field(j)->name()] = new Node();
       }
     }
     if (ContainsKey(node->children, parts[i])) {

src/google/protobuf/util/internal/protostream_objectsource.cc

@@ -265,16 +265,16 @@ util::StatusOr<uint32_t> ProtoStreamObjectSource::RenderMap(
     std::string map_key;
     for (uint32_t tag = stream_->ReadTag(); tag != 0;
          tag = stream_->ReadTag()) {
-      const google::protobuf::Field* field =
+      const google::protobuf::Field* map_entry_field =
           FindAndVerifyField(*field_type, tag);
-      if (field == nullptr) {
+      if (map_entry_field == nullptr) {
         WireFormat::SkipField(stream_, tag, nullptr);
         continue;
       }
       // Map field numbers are key = 1 and value = 2
-      if (field->number() == 1) {
-        map_key = ReadFieldValueAsString(*field);
-      } else if (field->number() == 2) {
+      if (map_entry_field->number() == 1) {
+        map_key = ReadFieldValueAsString(*map_entry_field);
+      } else if (map_entry_field->number() == 2) {
         if (map_key.empty()) {
           // An absent map key is treated as the default.
           const google::protobuf::Field* key_field =
@@ -286,7 +286,7 @@ util::StatusOr<uint32_t> ProtoStreamObjectSource::RenderMap(
           }
           ASSIGN_OR_RETURN(map_key, MapKeyDefaultValueAsString(*key_field));
         }
-        RETURN_IF_ERROR(RenderField(field, map_key, ow));
+        RETURN_IF_ERROR(RenderField(map_entry_field, map_key, ow));
       } else {
         // The Type info for this map entry is incorrect. It should contain
         // exactly two fields with field number 1 and 2.