When no clear() is generated, still initialize fields.

https://android-review.googlesource.com/#/c/67890/ removed field
initialization from the ctor, making it just call clear() instead.

When I added the generate_clear option back (as part of the reftypes
compat mode) in https://android-review.googlesource.com/#/c/109530/,
I forgot to ensure that what clear() used to do was inlined in the
constructor.

This change fixes NPEs that are happening for users of
reftypes_compat_mode who rely on unset repeated fields being empty
arrays rather than null.

Change-Id: Idb58746c60f4a4054b7ebb5c3b0e76b16ff88184

2 files changed, 21 insertions, 12 deletions

diff --git a/src/google/protobuf/compiler/javanano/javanano_message.cc b/src/google/protobuf/compiler/javanano/javanano_message.cc
index 7c52ca3..4df3ae8 100644
--- a/src/google/protobuf/compiler/javanano/javanano_message.cc
+++ b/src/google/protobuf/compiler/javanano/javanano_message.cc
@@ -251,14 +251,18 @@ void MessageGenerator::Generate(io::Printer* printer) {
     }
     printer->Print("}\n");
   } else {
+    printer->Print(
+      "\n"
+      "public $classname$() {\n",
+      "classname", descriptor_->name());
     if (params_.generate_clear()) {
-      printer->Print(
-        "\n"
-        "public $classname$() {\n"
-        "  clear();\n"
-        "}\n",
-        "classname", descriptor_->name());
+      printer->Print("  clear();\n");
+    } else {
+      printer->Indent();
+      GenerateFieldInitializers(printer);
+      printer->Outdent();
     }
+    printer->Print("}\n");
   }
 
   // Other methods in this class
@@ -453,6 +457,15 @@ void MessageGenerator::GenerateClear(io::Printer* printer) {
     "classname", descriptor_->name());
   printer->Indent();
 
+  GenerateFieldInitializers(printer);
+
+  printer->Outdent();
+  printer->Print(
+    "  return this;\n"
+    "}\n");
+}
+
+void MessageGenerator::GenerateFieldInitializers(io::Printer* printer) {
   // Clear bit fields.
   int totalInts = (field_generators_.total_bits() + 31) / 32;
   for (int i = 0; i < totalInts; i++) {
@@ -470,12 +483,7 @@ void MessageGenerator::GenerateClear(io::Printer* printer) {
   if (params_.store_unknown_fields()) {
     printer->Print("unknownFieldData = null;\n");
   }
-
-  printer->Outdent();
-  printer->Print(
-    "  cachedSize = -1;\n"
-    "  return this;\n"
-    "}\n");
+  printer->Print("cachedSize = -1;\n");
 }
 
 void MessageGenerator::GenerateEquals(io::Printer* printer) {
diff --git a/src/google/protobuf/compiler/javanano/javanano_message.h b/src/google/protobuf/compiler/javanano/javanano_message.h
index f87f84f..f53c1f7 100644
--- a/src/google/protobuf/compiler/javanano/javanano_message.h
+++ b/src/google/protobuf/compiler/javanano/javanano_message.h
@@ -77,6 +77,7 @@ class MessageGenerator {
                                  const FieldDescriptor* field);
 
   void GenerateClear(io::Printer* printer);
+  void GenerateFieldInitializers(io::Printer* printer);
   void GenerateEquals(io::Printer* printer);
   void GenerateHashCode(io::Printer* printer);