Added arrays to queues.

Change-Id: Ifcb5ff0ecdbd47e7fa445275195cd7a87e96c20a
diff --git a/aos/build/queues/cpp_pretty_print/dep_file_pair.rb b/aos/build/queues/cpp_pretty_print/dep_file_pair.rb
index c13bb9e..63b3fbd 100644
--- a/aos/build/queues/cpp_pretty_print/dep_file_pair.rb
+++ b/aos/build/queues/cpp_pretty_print/dep_file_pair.rb
@@ -326,7 +326,7 @@
 				state.pp("template < ")
 				state.pp(@t_args)
 			else
-				state.pp("template <")
+				state.pp("template < ")
 			end
 			state.pp(">\n")
 		end
diff --git a/aos/build/queues/cpp_pretty_print/file_pair_types.rb b/aos/build/queues/cpp_pretty_print/file_pair_types.rb
index 8f60b77..25ce4fe 100644
--- a/aos/build/queues/cpp_pretty_print/file_pair_types.rb
+++ b/aos/build/queues/cpp_pretty_print/file_pair_types.rb
@@ -157,7 +157,7 @@
 			state.pp("template < ")
 			state.pp(@t_args)
 		else
-			state.pp("template <")
+			state.pp("template < ")
 		end
 		state.pp(">\n")
 		state.pp("class #@name")
diff --git a/aos/build/queues/objects/queue.rb b/aos/build/queues/objects/queue.rb
index 610bdf7..81cd181 100644
--- a/aos/build/queues/objects/queue.rb
+++ b/aos/build/queues/objects/queue.rb
@@ -84,16 +84,21 @@
 		check_type_error(locals)
 		if(@is_struct_type)
 			tval = lookup_type(locals)
-			member = Target::MessageStructElement.new(tval, name)
+			member = Target::MessageStructElement.new(tval, @name)
+      if (@length != nil)
+        inner_member = member
+        member = Target::MessageArrayElement.new(inner_member, @length)
+      end
 		else
-			if(@length == nil)
-				member = Target::MessageElement.new(@type,@name)
-			else
-				member = Target::MessageArrayElement.new(@type,@name,@length)
-			end
+			member = Target::MessageElement.new(@type,@name)
 			member.size = size()
 			member.zero = Zero[@type] || "0";
 			member.printformat = toPrintFormat()
+
+			if(@length != nil)
+        inner_member = member
+				member = Target::MessageArrayElement.new(inner_member,@length)
+			end
 		end
 		locals.local.add_member(member)
 	end
diff --git a/aos/build/queues/output/message_dec.rb b/aos/build/queues/output/message_dec.rb
index 903a872..36300ea 100644
--- a/aos/build/queues/output/message_dec.rb
+++ b/aos/build/queues/output/message_dec.rb
@@ -16,7 +16,7 @@
 			if(member.respond_to?(:add_TypeRegister))
         register_members.push(member)
 			end
-			fields << "new ::aos::MessageType::Field{#{tId}, #{fieldName}}"
+			fields << "new ::aos::MessageType::Field{#{tId}, #{member.respond_to?(:length) ? member.length : 0}, #{fieldName}}"
 		end
     register_members.uniq do |member|
       member.type
@@ -35,12 +35,12 @@
           type_class.add_member(cons)
           @members.each do |member|
             if member.respond_to?(:type_name)
-              type_name = member.type_name(cpp_tree)
+              type_name = "#{member.type_name(cpp_tree)} #{member.name}_in"
             else
-              type_name = member.type
+              type_name = member.create_usage(cpp_tree, "#{member.name}_in")
             end
 
-            cons.args << "#{type_name} #{member.name}_in"
+            cons.args << type_name
             cons.add_cons(member.name, member.name + '_in')
           end
         end
@@ -187,7 +187,7 @@
 		type_class.set_parent("public ::aos::Message")
 		ts = self.simpleStr()
 		self.msg_hash = "0x#{Digest::SHA1.hexdigest(ts)[-8..-1]}"
-		type_class.add_member("enum {kQueueLength = 200, kHash = #{self.msg_hash}}")
+		type_class.add_member("enum {kQueueLength = 100, kHash = #{self.msg_hash}}")
 		@members.each do |elem|
 			type_class.add_member(elem.create_usage(cpp_tree))
 		end
@@ -245,22 +245,37 @@
 	def initialize(type,name)
 		@type,@name = type,name
 	end
+  def type()
+    return @type
+  end
+  def type_name(cpp_tree)
+    return type()
+  end
 	def toPrintFormat()
 		return printformat
 	end
-	def create_usage(cpp_tree)
-		"#{@type} #{@name}"
+	def create_usage(cpp_tree, this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		"#{@type} #{this_name}"
 	end
-	def toNetwork(offset,suite, parent = "")
+	def toNetwork(offset,suite, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
 		suite << f_call = CPP::FuncCall.build("to_network",
-									 "&#{parent}#{@name}",
+									 "&#{parent}#{this_name}",
 									 "&buffer[#{offset}]")
 		f_call.args.dont_wrap = true
 	end
-	def toHost(offset,suite, parent = "")
+	def toHost(offset,suite, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
 		suite << f_call = CPP::FuncCall.build("to_host",
 									 "&buffer[#{offset}]",
-									 "&#{parent}#{@name}")
+									 "&#{parent}#{this_name}")
 		f_call.args.dont_wrap = true
 	end
 	def getTypeID()
@@ -271,57 +286,112 @@
 	def simpleStr()
 		"#{@type} #{@name}"
 	end
-	def set_message_builder(suite)
-		suite << "msg_ptr_->#{@name} = #{@name}"
+	def set_message_builder(suite, this_name=nil)
+    this_name ||= @name
+		suite << "msg_ptr_->#{this_name} = #{this_name}"
 	end
 
-	def zeroCall(suite, parent = "")
-		suite << CPP::Assign.new(parent + @name,@zero)
+	def zeroCall(suite, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		suite << CPP::Assign.new(parent + this_name,@zero)
 	end
-	def fetchPrintArgs(args, parent = "")
-		if (self.type == 'bool')
-			args.push("#{parent}#{self.name} ? 'T' : 'f'")
-    elsif (self.type == '::aos::time::Time')
-      args.push("AOS_TIME_ARGS(#{parent}#{self.name}.sec(), #{parent}#{self.name}.nsec())")
+	def fetchPrintArgs(args, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		if (@type == 'bool')
+			args.push("#{parent}#{this_name} ? 'T' : 'f'")
+    elsif (@type == '::aos::time::Time')
+      args.push("AOS_TIME_ARGS(#{parent}#{this_name}.sec(), #{parent}#{this_name}.nsec())")
 		else
-			args.push("#{parent}#{self.name}")
+			args.push("#{parent}#{this_name}")
 		end
 	end
 end
 class Target::MessageArrayElement < Target::Node
-	attr_accessor :name,:loc,:size,:zero,:type
-	def initialize(type,name,length)
-		@type,@name,@length = type,name,length
+	attr_accessor :loc, :length
+	def initialize(type,length)
+		@type,@length = type,length
 	end
-	def create_usage(cpp_tree)
-		"#{@type} #{@name}[#@length]"
+  def zero()
+    return @type.zero()
+  end
+  def name()
+    return @type.name()
+  end
+
+  def add_TypeRegister(*args)
+    if @type.respond_to?(:add_TypeRegister)
+      @type.add_TypeRegister(*args)
+    end
+  end
+
+	def toPrintFormat()
+		return ([@type.toPrintFormat] * @length).join(", ")
+	end
+	def create_usage(cpp_tree, this_name=nil)
+    if (this_name == nil)
+      this_name = name
+    end
+		return "::std::array< #{@type.type_name(cpp_tree)}, #{@length}> #{this_name}"
 	end
 	def type()
-		"#{@type}[#@length]"
+		return "::std::array< #{@type.type()}, #{@length}>"
+	end
+	def simpleStr()
+		return "#{@type.type} #{@name}[#{@length}]"
+	end
+	def getTypeID()
+    return @type.getTypeID()
 	end
 	def size()
-		@size * @length
+		return @type.size * @length
 	end
-	def toNetwork(offset,suite)
+	def toNetwork(offset, suite, parent="", this_name=nil)
+    if (this_name == nil)
+      this_name = name
+    end
 		offset = (offset == 0) ? "" : "#{offset} + "
-		suite << for_stmt = CPP::For.new("int i = 0","i < #{@length}","i++")
-		for_stmt.suite << f_call = CPP::FuncCall.build("to_network",
-									 "&(#{@name}[i])",
-									 "&buffer[i + #{offset}::aos::Message::Size()]")
-		f_call.args.dont_wrap = true
+    for_loop_var = getForLoopVar()
+		suite << for_stmt = CPP::For.new("int #{for_loop_var} = 0","#{for_loop_var} < #{@length}","#{for_loop_var}++")
+		@type.toNetwork("#{offset} (#{for_loop_var} * #{@type.size})", for_stmt.suite, parent, "#{this_name}[#{for_loop_var}]")
 	end
-	def toHost(offset,suite)
+	def toHost(offset, suite, parent="", this_name=nil)
+    if (this_name == nil)
+      this_name = name
+    end
 		offset = (offset == 0) ? "" : "#{offset} + "
-		suite << for_stmt = CPP::For.new("int i = 0","i < #{@length}","i++")
-		for_stmt.suite << f_call = CPP::FuncCall.build("to_host",
-									 "&buffer[i + #{offset}::aos::Message::Size()]",
-									 "&(#{@name}[i])")
-		f_call.args.dont_wrap = true
+    for_loop_var = getForLoopVar()
+		suite << for_stmt = CPP::For.new("int #{for_loop_var} = 0","#{for_loop_var} < #{@length}","#{for_loop_var}++")
+		@type.toHost("#{offset} (#{for_loop_var} * #{@type.size})", for_stmt.suite, parent, "#{this_name}[#{for_loop_var}]")
 	end
-	def set_message_builder(suite)
-		suite << "memcpy(msg_ptr_->#{@name},#{@name},#@length)"
+	def set_message_builder(suite, this_name=nil)
+    if (this_name == nil)
+      this_name = name
+    end
+
+    for_loop_var = getForLoopVar()
+		suite << for_stmt = CPP::For.new("int #{for_loop_var} = 0","#{for_loop_var} < #{@length}","#{for_loop_var}++")
+		@type.set_message_builder(for_stmt.suite, "#{this_name}[#{for_loop_var}]")
 	end
-	def zeroCall(suite)
-		suite << "memset(#@name,0,#{size()})"
+	def zeroCall(suite, parent="", this_name=nil)
+    if (this_name == nil)
+      this_name = name
+    end
+
+		offset = (offset == 0) ? "" : "#{offset} + "
+    for_loop_var = getForLoopVar()
+		suite << for_stmt = CPP::For.new("int #{for_loop_var} = 0","#{for_loop_var} < #{@length}","#{for_loop_var}++")
+		@type.zeroCall(for_stmt.suite, parent, "#{this_name}[#{for_loop_var}]")
+	end
+	def fetchPrintArgs(args, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = name
+    end
+    for i in 0..(@length-1)
+		  @type.fetchPrintArgs(args, parent, "#{this_name}[#{i}]")
+    end
 	end
 end
diff --git a/aos/build/queues/output/q_file.rb b/aos/build/queues/output/q_file.rb
index a39799d7..471bdcb 100644
--- a/aos/build/queues/output/q_file.rb
+++ b/aos/build/queues/output/q_file.rb
@@ -4,6 +4,12 @@
   require "digest/sha1"
 end
 
+$i = 0
+def getForLoopVar()
+  $i = $i + 1
+  return "_autogen_index_#{$i}"
+end
+
 module Target
 end
 class Target::Node
@@ -30,6 +36,7 @@
 	end
 	def make_cpp_tree(rel_path)
 		cpp_tree = DepFilePair.new(rel_path)
+		cpp_tree.add_header_include("<array>")
 		cpp_tree.add_header_include("\"aos/common/macros.h\"")
 		cpp_tree.add_header_include("\"aos/common/queue.h\"")
 		@class_types.each do |type|
diff --git a/aos/build/queues/output/q_struct.rb b/aos/build/queues/output/q_struct.rb
index 05c2932..7211ff0 100644
--- a/aos/build/queues/output/q_struct.rb
+++ b/aos/build/queues/output/q_struct.rb
@@ -85,29 +85,47 @@
 	def toPrintFormat()
 		@type.getPrintFormat()
 	end
-	def create_usage(cpp_tree)
-		return "#{type_name(cpp_tree)} #{@name}"
+	def create_usage(cpp_tree, this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		return "#{type_name(cpp_tree)} #{this_name}"
 	end
 	def add_TypeRegister(cpp_tree, o_type, member_func)
 		type = cpp_tree.get(@type)
 		tName = @type.loc.to_cpp_id(type.name)
 		member_func.suite << "#{tName}::GetType()"
 	end
-	def fetchPrintArgs(args, parent = "")
-		@type.fetchPrintArgs(args, parent + "#{@name}.")
+	def fetchPrintArgs(args, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		@type.fetchPrintArgs(args, parent + "#{this_name}.")
 	end
-	def toNetwork(offset,suite, parent = "")
-		@type.toNetwork(offset, suite, parent + "#{@name}.")
+	def toNetwork(offset,suite, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		@type.toNetwork(offset, suite, parent + "#{this_name}.")
 	end
-	def toHost(offset,suite, parent = "")
-		@type.toHost(offset, suite, parent + "#{@name}.")
+	def toHost(offset,suite, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		@type.toHost(offset, suite, parent + "#{this_name}.")
 	end
-	def set_message_builder(suite)
-		suite << "msg_ptr_->#{@name} = #{@name}"
+	def set_message_builder(suite, this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		suite << "msg_ptr_->#{this_name} = #{this_name}"
 	end
 
-	def zeroCall(suite, parent = "")
-		@type.zeroCall(suite, parent + "#{@name}.")
+	def zeroCall(suite, parent = "", this_name=nil)
+    if (this_name == nil)
+      this_name = @name
+    end
+		@type.zeroCall(suite, parent + "#{this_name}.")
 	end
 	def simpleStr()
 		"#{@type.simpleStr()} #{@name}"
diff --git a/aos/common/common.gyp b/aos/common/common.gyp
index fb410b7..9a63e48 100644
--- a/aos/common/common.gyp
+++ b/aos/common/common.gyp
@@ -109,6 +109,7 @@
         '<(EXTERNALS):gtest',
         'test_queue',
         '<(AOS)/build/aos.gyp:logging',
+        'queue_testutils',
       ],
     },
     {
diff --git a/aos/common/queue_types.cc b/aos/common/queue_types.cc
index 42dec0c..f04e365 100644
--- a/aos/common/queue_types.cc
+++ b/aos/common/queue_types.cc
@@ -43,6 +43,8 @@
   for (int i = 0; i < number_fields; ++i) {
     to_network(&fields[i]->type, buffer);
     buffer += sizeof(fields[i]->type);
+    to_network(&fields[i]->length, buffer);
+    buffer += sizeof(fields[i]->length);
     length = fields[i]->name.size();
     to_network(&length, buffer);
     buffer += sizeof(length);
@@ -53,7 +55,8 @@
   return buffer - buffer_start;
 }
 
-MessageType *MessageType::Deserialize(const char *buffer, size_t *bytes) {
+MessageType *MessageType::Deserialize(const char *buffer, size_t *bytes,
+                                      bool deserialize_length) {
   uint16_t name_length;
   decltype(MessageType::super_size) super_size;
   decltype(MessageType::id) id;
@@ -94,6 +97,10 @@
 
     to_host(buffer, &fields[i]->type);
     buffer += sizeof(fields[i]->type);
+    if (deserialize_length) {
+      to_host(buffer, &fields[i]->length);
+      buffer += sizeof(fields[i]->length);
+    }
     to_host(buffer, &field_name_length);
     buffer += sizeof(field_name_length);
 
@@ -108,6 +115,50 @@
   return r.release();
 }
 
+bool PrintArray(char *output, size_t *output_bytes, const void *input,
+                size_t *input_bytes, uint32_t type_id, uint32_t length) {
+  if (*output_bytes < 1) return false;
+  *output_bytes -= 1;
+  *(output++) = '[';
+
+  bool first = true;
+  for (uint32_t i = 0; i < length; ++i) {
+    if (first) {
+      first = false;
+    } else {
+      if (*output_bytes < 2) return false;
+      *output_bytes -= 2;
+      *(output++) = ',';
+      *(output++) = ' ';
+    }
+
+    const size_t output_bytes_before = *output_bytes,
+                 input_bytes_before = *input_bytes;
+    if (MessageType::IsPrimitive(type_id)) {
+      if (!PrintField(output, output_bytes, input, input_bytes, type_id)) {
+        return false;
+      }
+    } else {
+      if (!PrintMessage(output, output_bytes, input, input_bytes,
+                        type_cache::Get(type_id))) {
+        return false;
+      }
+      // Ignore the trailing '\0' that the subcall put on.
+      *output_bytes += 1;
+    }
+
+    // Update the input and output pointers.
+    output += output_bytes_before - *output_bytes;
+    input =
+        static_cast<const char *>(input) + input_bytes_before - *input_bytes;
+  }
+  if (*output_bytes < 2) return false;
+  *output_bytes -= 2;
+  *(output++) = ']';
+  *(output++) = '\0';
+  return true;
+}
+
 bool PrintMessage(char *output, size_t *output_bytes, const void *input,
                   size_t *input_bytes, const MessageType &type) {
   *input_bytes -= type.super_size;
@@ -138,14 +189,21 @@
 
     const size_t output_bytes_before = *output_bytes,
                  input_bytes_before = *input_bytes;
-    if (MessageType::IsPrimitive(type.fields[i]->type)) {
-      if (!PrintField(output, output_bytes, input, input_bytes,
-                      type.fields[i]->type)) {
+    const uint32_t type_id = type.fields[i]->type;
+    if (type.fields[i]->length > 0) {
+      if (!PrintArray(output, output_bytes, input, input_bytes, type_id,
+                      type.fields[i]->length)) {
+        return false;
+      }
+      // Ignore the trailing '\0' that the subcall put on.
+      *output_bytes += 1;
+    } else if (MessageType::IsPrimitive(type_id)) {
+      if (!PrintField(output, output_bytes, input, input_bytes, type_id)) {
         return false;
       }
     } else {
       if (!PrintMessage(output, output_bytes, input, input_bytes,
-                        type_cache::Get(type.fields[i]->type))) {
+                        type_cache::Get(type_id))) {
         return false;
       }
       // Ignore the trailing '\0' that the subcall put on.
diff --git a/aos/common/queue_types.h b/aos/common/queue_types.h
index 7381029..be943c1 100644
--- a/aos/common/queue_types.h
+++ b/aos/common/queue_types.h
@@ -21,6 +21,8 @@
   struct Field {
     // The type ID for the type of this field.
     uint32_t type;
+    // The length of the array if it is one or 0.
+    uint32_t length;
     ::std::string name;
   };
 
@@ -47,8 +49,11 @@
   ssize_t Serialize(char *buffer, size_t max_bytes) const;
   // bytes should start out as the number of bytes available in buffer and gets
   // reduced by the number actually read before returning.
+  // deserialize_length is whether to look for a length field in the serialized
+  // data.
   // Returns a new instance allocated with new or nullptr for error.
-  static MessageType *Deserialize(const char *buffer, size_t *bytes);
+  static MessageType *Deserialize(const char *buffer, size_t *bytes,
+                                  bool deserialize_length = true);
 
   static bool IsPrimitive(uint32_t type_id) {
     return (type_id & 0x2000) != 0;
diff --git a/aos/common/queue_types_test.cc b/aos/common/queue_types_test.cc
index 514499b..868820f 100644
--- a/aos/common/queue_types_test.cc
+++ b/aos/common/queue_types_test.cc
@@ -10,10 +10,12 @@
 #include "aos/common/byteorder.h"
 #include "aos/queue_primitives.h"
 #include "aos/common/logging/logging.h"
+#include "aos/common/queue_testutils.h"
 
 using ::aos::common::testing::Structure;
 using ::aos::common::testing::MessageWithStructure;
 using ::aos::common::testing::OtherTestingMessage;
+using ::aos::common::testing::MessageWithArrays;
 
 namespace aos {
 namespace testing {
@@ -21,12 +23,16 @@
 typedef MessageType::Field Field;
 
 static const MessageType kTestType1(5, 0x1234, "TestType1",
-                                    {new Field{0, "field1"},
-                                     new Field{0, "field2"},
-                                     new Field{0, "field3"}});
+                                    {new Field{0, 0, "field1"},
+                                     new Field{0, 0, "field2"},
+                                     new Field{0, 0, "field3"}});
 
 class QueueTypesTest : public ::testing::Test {
  public:
+  QueueTypesTest() {
+    ::aos::common::testing::EnableTestLogging();
+  }
+
   ::testing::AssertionResult Equal(const MessageType &l, const MessageType &r) {
     using ::testing::AssertionFailure;
     if (l.id != r.id) {
@@ -83,7 +89,7 @@
 
 class PrintMessageTest : public ::testing::Test {
  public:
-  char input[128], output[128];
+  char input[128], output[256];
   size_t input_bytes, output_bytes;
 };
 
@@ -194,6 +200,15 @@
 static const ::std::string kTestStructure1String =
     ".aos.common.testing.Structure{struct_bool:f, struct_int:973"
     ", struct_float:8.560000}";
+static const ::aos::common::testing::Structure kStructureValue(true, 973, 3.14);
+static const MessageWithArrays kTestMessageWithArrays({{971, 254, 1678}},
+                                                      {{kStructureValue,
+                                                        kStructureValue}});
+static const ::std::string kTestMessageWithArraysString =
+    ".aos.common.testing.MessageWithArrays{test_int:[971, 254, 1678], "
+    "test_struct:[.aos.common.testing.Structure{struct_bool:T, struct_int:973, "
+    "struct_float:3.140000}, .aos.common.testing.Structure{struct_bool:T, "
+    "struct_int:973, struct_float:3.140000}]}";
 
 TEST_F(PrintMessageTest, Basic) {
   CHECK_GE(sizeof(input), kTestMessage1.Size());
@@ -244,5 +259,16 @@
   EXPECT_EQ(kOutput.size() + 1, sizeof(output) - output_bytes);
 }
 
+TEST_F(PrintMessageTest, Array) {
+  CHECK_GE(sizeof(input), kTestMessageWithArrays.Size());
+  input_bytes = kTestMessageWithArrays.Serialize(input);
+  output_bytes = sizeof(output);
+  ASSERT_TRUE(PrintMessage(output, &output_bytes, input, &input_bytes,
+                           *kTestMessageWithArrays.GetType()));
+  EXPECT_EQ(kTestMessageWithArraysString, ::std::string(output));
+  EXPECT_EQ(kTestMessageWithArraysString.size() + 1,
+            sizeof(output) - output_bytes);
+}
+
 }  // namespace testing
 }  // namespace aos
diff --git a/aos/common/test_queue.q b/aos/common/test_queue.q
index d603802..827b607 100644
--- a/aos/common/test_queue.q
+++ b/aos/common/test_queue.q
@@ -23,6 +23,11 @@
   double test_double;
 };
 
+message MessageWithArrays {
+  uint16_t[3] test_int;
+  Structure[2] test_struct;
+};
+
 queue TestingMessage test_queue;
 
 queue_group TwoQueues {
diff --git a/aos/linux_code/logging/log_displayer.cc b/aos/linux_code/logging/log_displayer.cc
index 440235d..7da0dc4 100644
--- a/aos/linux_code/logging/log_displayer.cc
+++ b/aos/linux_code/logging/log_displayer.cc
@@ -251,6 +251,13 @@
       ::aos::MessageType *type = ::aos::MessageType::Deserialize(
           reinterpret_cast<const char *>(msg + 1), &bytes);
       if (type == nullptr) {
+        LOG(INFO, "Trying old version of type decoding.\n");
+        bytes = msg->message_size;
+        type = ::aos::MessageType::Deserialize(
+            reinterpret_cast<const char *>(msg + 1), &bytes, false);
+      }
+
+      if (type == nullptr) {
         LOG(WARNING, "Error deserializing MessageType of size %" PRIx32
                      " starting at %zx.\n",
             msg->message_size, reader.file_offset(msg + 1));