Down integrate from Google internal branch for C++ and Java.

- Maps for C++ lite
- C++ Arena optimizations.
- Java Lite runtime code size optimization.

Change-Id: I7537a4357c1cb385d23f9e8aa7ffdfeefe079f13

1 files changed, 49 insertions, 18 deletions

diff --git a/src/google/protobuf/map_field_test.cc b/src/google/protobuf/map_field_test.cc
index 045f8f2c..61344cbb 100644
--- a/src/google/protobuf/map_field_test.cc
+++ b/src/google/protobuf/map_field_test.cc
@@ -35,13 +35,16 @@
 #endif
 
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/arena.h>
 #include <google/protobuf/map.h>
+#include <google/protobuf/arena_test_util.h>
 #include <google/protobuf/map_unittest.pb.h>
 #include <google/protobuf/map_test_util.h>
 #include <google/protobuf/unittest.pb.h>
 #include <google/protobuf/map_field_inl.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>
+#include <google/protobuf/wire_format_lite_inl.h>
 #include <gtest/gtest.h>
 
 namespace google {
@@ -53,6 +56,9 @@ using unittest::TestAllTypes;
 
 class MapFieldBaseStub : public MapFieldBase {
  public:
+  typedef void DestructorSkippable_;
+  MapFieldBaseStub() {}
+  explicit MapFieldBaseStub(Arena* arena) : MapFieldBase(arena) {}
   void SyncRepeatedFieldWithMap() const {
     MapFieldBase::SyncRepeatedFieldWithMap();
   }
@@ -63,16 +69,6 @@ class MapFieldBaseStub : public MapFieldBase {
   RepeatedPtrField<Message>* InternalRepeatedField() {
     return repeated_field_;
   }
-  // Get underlined map without synchronizing repeated field.
-  template <typename MapType>
-  const MapType& GetMap() {
-    return *reinterpret_cast<MapType*>(base_map_);
-  }
-  // Get underlined map without synchronizing repeated field.
-  template <typename MapType>
-  MapType* MutableMap() {
-    return reinterpret_cast<MapType*>(base_map_);
-  }
   bool IsMapClean() { return state_ != 0; }
   bool IsRepeatedClean() { return state_ != 1; }
   void SetMapDirty() { state_ = 0; }
@@ -81,8 +77,8 @@ class MapFieldBaseStub : public MapFieldBase {
 
 class MapFieldBasePrimitiveTest : public ::testing::Test {
  protected:
-  typedef MapField<int32, int32, FieldDescriptor::TYPE_INT32,
-                   FieldDescriptor::TYPE_INT32> MapFieldType;
+  typedef MapField<int32, int32, WireFormatLite::TYPE_INT32,
+                   WireFormatLite::TYPE_INT32, false> MapFieldType;
 
   MapFieldBasePrimitiveTest() {
     // Get descriptors
@@ -144,6 +140,38 @@ TEST_F(MapFieldBasePrimitiveTest, MutableRepeatedField) {
   }
 }
 
+TEST_F(MapFieldBasePrimitiveTest, Arena) {
+  // Allocate a large initial block to avoid mallocs during hooked test.
+  std::vector<char> arena_block(128 * 1024);
+  ArenaOptions options;
+  options.initial_block = arena_block.data();
+  options.initial_block_size = arena_block.size();
+  Arena arena(options);
+
+  {
+    NoHeapChecker no_heap;
+
+    MapFieldType* map_field =
+        Arena::Create<MapFieldType>(&arena, &arena, default_entry_);
+
+    // Set content in map
+    (*map_field->MutableMap())[100] = 101;
+
+    // Trigger conversion to repeated field.
+    map_field->GetRepeatedField();
+  }
+
+  {
+    NoHeapChecker no_heap;
+
+    MapFieldBaseStub* map_field =
+        Arena::Create<MapFieldBaseStub>(&arena, &arena);
+
+    // Trigger conversion to repeated field.
+    EXPECT_TRUE(map_field->MutableRepeatedField() != NULL);
+  }
+}
+
 namespace {
 enum State { CLEAN, MAP_DIRTY, REPEATED_DIRTY };
 }  // anonymous namespace
@@ -152,8 +180,10 @@ class MapFieldStateTest
     : public testing::TestWithParam<State> {
  public:
  protected:
-  typedef MapField<int32, int32, FieldDescriptor::TYPE_INT32,
-                FieldDescriptor::TYPE_INT32> MapFieldType;
+  typedef MapField<int32, int32, WireFormatLite::TYPE_INT32,
+                   WireFormatLite::TYPE_INT32, false> MapFieldType;
+  typedef MapFieldLite<int32, int32, WireFormatLite::TYPE_INT32,
+                       WireFormatLite::TYPE_INT32, false> MapFieldLiteType;
   MapFieldStateTest() : state_(GetParam()) {
     // Build map field
     const Descriptor* map_descriptor =
@@ -199,9 +229,8 @@ class MapFieldStateTest
     MakeMapDirty(map_field);
     MapFieldBase* map_field_base = map_field;
     map_field_base->MutableRepeatedField();
-    MapFieldBaseStub* stub =
-        reinterpret_cast<MapFieldBaseStub*>(map_field_base);
-    Map<int32, int32>* map = stub->MutableMap<Map<int32, int32> >();
+    Map<int32, int32>* map = implicit_cast<MapFieldLiteType*>(map_field)
+                                 ->MapFieldLiteType::MutableMap();
     map->clear();
 
     Expect(map_field, REPEATED_DIRTY, 0, 1, false);
@@ -213,7 +242,8 @@ class MapFieldStateTest
     MapFieldBaseStub* stub =
         reinterpret_cast<MapFieldBaseStub*>(map_field_base);
 
-    Map<int32, int32>* map = stub->MutableMap<Map<int32, int32> >();
+    Map<int32, int32>* map = implicit_cast<MapFieldLiteType*>(map_field)
+                                 ->MapFieldLiteType::MutableMap();
     RepeatedPtrField<Message>* repeated_field = stub->InternalRepeatedField();
 
     switch (state) {
@@ -430,6 +460,7 @@ TEST_P(MapFieldStateTest, MutableMapField) {
   }
 }
 
+
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google